Thursday, May 31, 2018

My Ghost Story

Ghost reaches for me in the dark caught on tape (my ghost story ...
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My Ghost Story is an American television series on the paranormal, which premiered on July 17, 2010 on the Biography Channel. The series features ghost stories told from a person's own supposed experience with the supernatural. Each episode features claims of encounters at reportedly haunted locations all over the United States, as well as a few locations in other countries. A spin-off series My Ghost Story Asia premiered on the Biography Channel (Asia) on 16 August 2012 featuring stories from Singapore and Malaysia. The fifth season started on October 5, 2012 on Fridays at 9/8 Central.
The sixth season which began on August 12, 2013 aired on the Biography Channel, the original broadcast channel, but halfway through the season the broadcast channel was changed to the Lifetime Movie Network (LMN).


Video My Ghost Story



Synopsis

Each episode is narrated by people who tell their own unique ghost stories and personal experiences of alleged paranormal activity and supposed encounters with the unexplained in a particular location. These individuals usually start off the show by saying "My ghost story began when..." They also show the viewers' visual evidence they claim to have captured on their homemade videos.

Each episode features reenactments, video clips, and interviews of people who claim to have experienced encounters with the supernatural. These stories also include some historical facts of the reportedly haunted locations.


Maps My Ghost Story



Syndication

Note: The My Ghost Story series is based on the 2008 and 2009 specials My Ghost Story: Hauntings Revealed. New episodes currently air on the Biography Channel Saturday nights at 10pm EST. Season two premiered on April 9, 2011. Season three premiered on October 15, 2011. Season four premiered on April 21, 2012. As of October 3, 2013, My Ghost Story is airing on Lifetime/Lifetime Movie Network.

Warning: At the beginning of each episode a parental advisory warning is shown: "What you are about to see are haunted events encountered by real people. Some may find it disturbing."


Watch My Ghost Story Online | On Demand | UKTV Play
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Series overview


My Ghost Story S06E21 Bloodcurdling - Video Dailymotion
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Specials


My Ghost Story - YouTube
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Episodes

Season 1 (2010)

Season 2 (2011)

Season 3 (2011)

Season 4 (2012)

Note: This season is subtitled My Ghost Story: Caught on Camera.

Season 5 (2012-2013)

Note: This season is also subtitled My Ghost Story: Caught on Camera.

Season 6 (2013)

Note: This season is also subtitled My Ghost Story: Caught on Camera.


Watch My Ghost Story Online | On Demand | UKTV Play
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See also

  • Ghost hunting
  • List of ghost films
  • List of reportedly haunted locations
  • Paranormal television

Similar TV programs

  • Celebrity Ghost Stories
  • Ghost Adventures
  • Ghost Hunters
  • Ghost Hunters International
  • Ghost Lab
  • Ghost Stories (2009 TV series)
  • Haunted History
  • Most Haunted
  • Most Terrifying Places in America
  • Paranormal State

BIO My Ghost Story Season 3 Episode 25 - YouTube
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References


My ghost story - Imgur
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External links

  • Official website at Biography Channel
  • My Ghost Story on IMDb
  • My Ghost Story at TV.com
  • My Ghost Story at TheTVDB.com
  • My Ghost Story at TV Guide

Source of article : Wikipedia

Portulaca grandiflora

Portulaca grandiflora - Moss Rose, Eleven O'Clock | World of ...
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Portulaca grandiflora is a succulent flowering plant in the family Portulacaceae, native to Argentina, southern Brazil, and Uruguay and often cultivated in gardens. It has many common names, including rose moss, ten o'clock, Mexican rose, moss rose, Vietnam Rose, sun rose, rock rose, and moss-rose purslane.

It is also seen in South Asia and widely spread in most of the cities with old 18th- and 19th-century architecture in the Balkans. In Pakistan it is called Gul Dopheri, meaning After Noon Flower, as flowers bloom whole after noon in summer's heat. In Bangladesh, it is called "time fuul", meaning "time flower", because the flower has a specific time to bloom. In India, it is called "nau bajiya" or "9 o'clock flower" as it blooms in morning around 9:00 am. In the Philippines, it is called uru-alas dose or like twelve o'clock because it loses its bloom by noon. In Vietnam, it is called "hoa m??i gi?" meaning "ten o'clock flower", because the flower is usually in full bloom at 10:00 in the morning. Its buds are often chewed by small birds like the house sparrow.

It is a small, but fast-growing annual plant growing to 30 cm tall, though usually less. However if it is cultivated properly it can easily reach this height. The leaves are thick and fleshy, up to 2.5 cm long, arranged alternately or in small clusters. The flowers are 2.5-3 cm diameter with five petals, variably red, orange, pink, white, and yellow.


Video Portulaca grandiflora



Cultivation and uses

Numerous cultivars have been selected for double flowers with additional petals, and for variation in flower color, and it is widely grown in temperate climates as an ornamental plant for annual bedding or as a container plant. It requires ample sunlight and well-drained soils. It requires almost no attention and spreads itself very easily. In places with old architecture it can grow between the stones of the road or sidewalk. Seeds are often sold as mixtures, such as Double Flowering Mixture (see illustrations).


Maps Portulaca grandiflora



Gallery


Portulaca grandiflora, the Moss rose or Rose Moss, native to South ...
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References

Source of article : Wikipedia

Tinea versicolor

Tinea versicolor - Wikipedia
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Tinea versicolor is a condition characterized by a skin eruption on the trunk and proximal extremities. The majority of tinea versicolor is caused by the fungus Malassezia globosa, although Malassezia furfur is responsible for a small number of cases. These yeasts are normally found on the human skin and become troublesome only under certain circumstances, such as a warm and humid environment, although the exact conditions that cause initiation of the disease process are poorly understood.

The condition pityriasis versicolor was first identified in 1846. Versicolor comes from the Latin, from vers?re to turn + color. It is also commonly referred to as Peter Elam's disease in many parts of South Asia.


Video Tinea versicolor



Signs and symptoms

The symptoms of this condition include:

  • Occasional fine scaling of the skin producing a very superficial ash-like scale
  • Pale, dark tan, or pink in color, with a reddish undertone that can darken when the patient is overheated, such as in a hot shower or during/after exercise. Tanning typically makes the affected areas contrast more starkly with the surrounding skin.
  • Sharp border

Pityriasis versicolor is more common in hot, humid climates or in those who sweat heavily, so it may recur each summer.

The yeasts can often be seen under the microscope within the lesions and typically have a so-called "spaghetti and meatball appearance" as the round yeasts produce filaments.

In people with dark skin tones, pigmentary changes such as hypopigmentation (loss of color) are common, while in those with lighter skin color, hyperpigmentation (increase in skin color) is more common. These discolorations have led to the term "sun fungus".


Maps Tinea versicolor



Pathophysiology

In cases of tinea versicolor caused by the fungus Malassezia furfur, lightening of the skin occurs due to the fungus's production of azelaic acid, which has a slight bleaching effect.


Tinea Versicolor - Causes, Signs, Symptoms, Treatment & Remedies
src: healthjade.com


Diagnosis

Tinea versicolor may be diagnosed by a potassium hydroxide (KOH) preparation and lesions may fluoresce copper-orange when exposed to Wood's lamp. The differential diagnosis for tinea versicolor infection includes:

  • Progressive macular hypomelanosis
  • Pityriasis alba
  • Pityriasis rosea
  • Seborrheic dermatitis
  • Erythrasma
  • Vitiligo
  • Leprosy
  • Syphilis
  • Post-inflammatory hypopigmentation

Diagnosis & Treatment Of Tinea Versicolor - YouTube
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Treatment

Treatments for tinea versicolor include:

  • Topical antifungal medications containing selenium sulfide are often recommended. Ketoconazole (Nizoral ointment and shampoo) is another treatment. It is normally applied to dry skin and washed off after 10 minutes, repeated daily for two weeks. Ciclopirox (Ciclopirox olamine) is an alternative treatment to ketoconazole, as it suppresses growth of the yeast Malassezia furfur. Initial results show similar efficacy to ketoconazole with a relative increase in subjective symptom relief due to its inherent anti-inflammatory properties. Other topical antifungal agents such as clotrimazole, miconazole, terbinafine, or zinc pyrithione can lessen symptoms in some patients. Additionally, hydrogen peroxide has been known to lessen symptoms and, on certain occasions, remove the problem, although permanent scarring has occurred with this treatment in some sufferers. Clotrimazole is also used combined with selenium sulfide.
  • Oral antifungals including ketoconazole or fluconazole in a single dose, or ketoconazole for seven days, or itraconazole can be used. The single-dose regimens, or pulse therapy regimens, can be made more effective by having the patient exercise 1-2 hours after the dose, to induce sweating. The sweat is allowed to evaporate, and showering is delayed for a day, leaving a film of the medication on the skin.

Tinea Versicolor: Stubborn Skin Condition? - Dr.Weil
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Epidemiology

This skin disease commonly affects adolescents and young adults, especially in warm and humid climates. The yeast is thought to feed on skin oils (lipids), as well as dead skin cells. Infections are more common in people who have seborrheic dermatitis, dandruff, and hyperhidrosis.


Pharmacological management of Tinea Versicolor in young ...
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References


Tinea Versicolor - Causes, Signs, Symptoms, Treatment & Remedies
src: healthjade.com


External links


  • Media related to Tinea versicolor at Wikimedia Commons

Source of article : Wikipedia

Rosetta Stone (company)

Simple and to the point of the brand | Logo designs | Pinterest ...
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Rosetta Stone Inc. is an education technology software company that develops language, literacy and brain-fitness software. Best known for its language-learning products, in 2013 the company expanded beyond language into education-technology with its acquisitions of Livemocha, Lexia Learning, Fit Brains and Tell Me More.


Video Rosetta Stone (company)



History

According to the company, founder Allen Stoltzfus learned German through immersion while living in Germany and found it relatively easy. In the 1980s, Stoltzfus began learning Russian in a classroom setting, but found the classroom setting much more difficult. He wanted to simulate the German experience, and he decided to use computer technology to create a similar learning experience. He enlisted the aid of his brother-in-law, John Fairfield, who held a PhD in computer science.

By 1992 CD-ROM technology made the project possible. They formed a company known as Fairfield Language Technologies in Harrisonburg, Virginia. Allen and John hired Eugene Stoltzfus (Allen's brother), Greg Keim and Michael Silverman. They released their software product under the title The Rosetta Stone. In 2003 the company announced the hiring of Tom Adams, a businessman with international experience, as President and CEO.

In 2006 the company changed names to Rosetta Stone, Ltd., and converted from an S corporation to a C corporation. Ownership transferred to investment firms ABS Capital Partners and Norwest Equity Partners. On September 23, 2008, Rosetta Stone Inc. filed an Initial public offering with the Securities and Exchange Commission.

On April 15, 2009, the company was listed as the Rosetta Stone on the New York Stock Exchange. Since 2016, the company's president and CEO has been John Hass. Rosetta Stone is transitioning to a cloud-based business model that goes beyond language learning and deeper into education technology. In 2013, it acquired four companies--Vivity Labs Inc (creators of the Fit Brains Trainer), Livemocha, Tell Me More, and Lexia Learning.

On September 17, 2013, Rosetta Stone announced the launch of a new Kids Division and in November, 2014 it debuted its first kids reading program for consumers, Rosetta Stone Kids Reading.

IPO

On April 15, 2009, Rosetta Stone raised $112 million in its initial public offering of stock shares. In its first full day of trading on the New York Stock Exchange, the stock gained 39% from its opening price. After a strong opening, however, the stock stumbled amid reports of weaknesses in Rosetta Stone's US business, resulting in the cancellation of a second offering, and a disappointing year end price just 5 cents off its opening price. The stock trades under ticker symbol RST. As of December 2015, the stock was at approximately $68.20 (USD) per share.

Offices

  • Corporate headquarters are in Arlington, Virginia.
  • There are also offices in Harrisonburg, Virginia; Boulder, Colorado; Austin, Texas; Seattle, Washington; Boston/Concord, Massachusetts; London, United Kingdom; and Seoul, South Korea.

Maps Rosetta Stone (company)



Endangered language communities

In 2004, Rosetta Stone Ltd. established its Endangered Language Program to contract with endangered language communities interested in custom software development to support language revitalization efforts.


GLPP: Opening & Closing Lexia - YouTube
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Support for the Combating Online Infringement and Counterfeits Act

Rosetta Stone was among a group of companies signed to a letter supporting Combating Online Infringement and Counterfeits Act (COICA), a bill which opponents argue amounts to censorship.


Rosetta Stone has the right idea - Stealing Share
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Awards

  • 2014 Tabby Award - Overall Winner and Users' Choice honoree in the Android - Education Category: Rosetta Course®
  • 2014 Tabby Award - Users' Choice honoree in the iPad - Education / Adults, Professionals and General Category: Rosetta Course®
  • 2014 Tabby Award - Overall Winner and Users' Choice honoree in the iPad - Health & Fitness Category: Fit Brains Trainer(TM)
  • 2014 Academics' Choice Smart Media Awards for Rosetta Course® for iOS
  • 2014 Academics' Choice Smart Media Awards for Rosetta Stone® Kids Lingo Letter Sounds(TM)
  • 2014 Academics' Choice Smart Media Awards for Fit Brains(TM) Trainer
  • 2014 Academics' Choice Smart Media Awards for Fit Brains Sparky's Adventures(TM)
  • 2014 Academics' Choice Smart Media Awards for Lexia Reading® Core5®
  • 2014 Best of Elearning! Award of Excellence for Rosetta Stone TOTALe® PRO for Business solution
  • 2014 iKids Awards for Rosetta Stone® Kids Lingo Letter Sounds(TM)
  • 2014/2015 eSchool News Reader's Choice Award for Lexia Reading® Core5®pre-K-5 reading program
  • 2012 Stevie Silver Award for the Best Use of Technology in Customer Service
  • 2012 Stevie Silver Award for the Young Customer Service Professional of the Year
  • 2012 Stevie Bronze Award for Customer Service Department of the Year
  • 2012 Stevie People's Choice for Favorite Customer Service
  • 2010 Eloqua Markies Award in the Marketing and Sales BFF finalist
  • 2010 Future 50 Winner
  • 2009 Technology CFO of the Year
  • 2009 CEO Tom Adams Named Ernst & Young Entrepreneur of the Year
  • 2009 CEO, Tom Adams named Ernst & Young 2009 Entrepreneur of the Year - Retail & Consumer Products
  • 2009 MT2 Top Training and Simulation Companies
  • 2009 Shenandoah Valley Technology Council's High Tech Company Award
  • 2009 Stevie Executive of the Year Award
  • 2008-2011, Deloitte's Technology Fast Award

Language Learning Company Rosetta Stone Expands Business Offering ...
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References


Rosetta Stone | Ads of the World™
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External links

  • Rosetta Stone website
  • Rosetta Stone factsheet -- Hoover's
  • Rosetta Stone company profile -- Google Finance
  • "Rosetta Stone Inc. IPO"
  • "Washington SmartCEO Announces 2010 Fast Growth Companies". Retrieved 11 May 2012. 

Source of article : Wikipedia

Wednesday, May 30, 2018

American International Group

Aig American Insurance Group - Insurance Quotes and Comparison
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American International Group, Inc., also known as AIG, is an American multinational finance and insurance corporation with operations in more than 80 countries and jurisdictions. As of December 31, 2016, AIG companies employed 56,400 people. The company operates through three core businesses: General Insurance, Life & Retirement, and a standalone technology-enabled subsidiary. General Insurance includes Commercial, Personal Insurance, U.S. and International field operations. Life & Retirement includes Group Retirement, Individual Retirement, Life, and Institutional Markets.

AIG's corporate headquarters are in New York City and the company also has offices around the world. AIG serves 87% of the Fortune Global 500 and 83% of the Forbes 2000. AIG was ranked 49th on the 2016 Fortune 500 list. According to the 2016 Forbes Global 2000 list, AIG is the 87th largest public company in the world. On December 31, 2016 AIG had $76.3 billion in shareholder equity.

AIG was a central player in the financial crisis of 2008. It was bailed out by the federal government for $180 billion, and the government took control. The Financial Crisis Inquiry Commission (FCIC) of the US government concluded AIG failed primarily because it sold massive amounts of insurance without hedging its investment. Its enormous sales of credit default swaps were "made without putting up initial collateral, setting aside capital reserves, or hedging its exposure -- a profound failure in corporate governance, particularly its risk-management practices." The US government sold off its shares after the crisis and completed the process in 2012.


Video American International Group



History

The early years: 1919 to 1945

AIG was founded 19 December 1919 when American Cornelius Vander Starr (1892-1968) established a general insurance agency, American Asiatic Underwriters (AAU), in Shanghai, China. Business grew rapidly, and two years later, Starr formed a life insurance operation. By the late 1920s, AAU had branches throughout China and Southeast Asia, including the Philippines, Indonesia, and Malaysia. In 1926, Mr. Starr opened his first office in the United States, American International Underwriters Corporation (AIU). He also focused on opportunities in Latin America and, in the late 1930s, AIU entered Havana, Cuba. The steady growth of the Latin American agencies proved significant as it would offset the decline in business from Asia due to the impending World War II. In 1939, Mr. Starr moved his headquarters from Shanghai, China, to New York City.

International and domestic expansion: 1946 to 1959

After World War II, American International Underwriters (AIU) entered Japan and Germany, to provide insurance for American military personnel. Throughout the late 1940s and early 1950s, AIU continued to expand in Europe, with offices opening in France, Italy, and the United Kingdom. In 1952, Mr. Starr began to focus on the American market by acquiring Globe & Rutgers Fire Insurance Company and its subsidiary, American Home Fire Assurance Company. By the end of the decade, C.V. Starr's general and life insurance organization included an extensive network of agents and offices in over 75 countries.

Reorganization and specialization: 1960 to 1979

In 1960, C.V. Starr hired Maurice R. Greenberg to develop an international accident and health business. Two years later, Mr. Greenberg reorganized one of C.V. Starr's U.S. holdings into a successful multiple line carrier. Greenberg focused on selling insurance through independent brokers rather than agents to eliminate agent salaries. Using brokers, AIU could price insurance according to its potential return even if it suffered decreased sales of certain products for great lengths of time with very little extra expense. In 1967, American International Group, Inc. (AIG) was incorporated as a unifying umbrella organization for most of C.V. Starr's general and life insurance businesses. In 1968, Starr named Greenberg his successor. The company went public in 1969.

The 1970s presented many challenges for AIG as operations in the Middle East and Southeast Asia were curtailed or ceased altogether due to the changing political landscape. However, AIG continued to expand its markets by introducing specialized energy, transportation, and shipping products to serve the needs of niche industries. By 1979, with a growing workforce and a worldwide network of offices, AIG offered clients superior technical and risk management skills in an increasingly competitive marketplace.

New opportunities and directions: 1980 to 1999

During the 1980s, AIG continued expanding its market distribution and worldwide network by offering a wide range of specialized products, including pollution liability and political risk. In 1984, AIG listed its shares on the New York Stock Exchange (NYSE). Throughout the 1990s, AIG developed new sources of income through diverse investments, including the acquisition of International Lease Finance Corporation (ILFC), a provider of leased aircraft to the airline industry. In 1992, AIG received the first foreign insurance license granted in over 40 years by the Chinese government. Within the U.S., AIG acquired SunAmerica Inc. a retirement savings company, in 1999.


Maps American International Group



Further expansion and decline: 2000 to 2012

Growth

The early 2000s saw a marked period of growth as AIG acquired American General Corporation, a leading domestic life insurance and annuities provider, and AIG entered new markets including India. In February 2000, AIG created a strategic advisory venture team with the Blackstone Group and Kissinger Associates "to provide financial advisory services to corporations seeking high level independent strategic advice." AIG was an investor in Blackstone from 1998 to March 2012, when it sold all of its shares in the company. Blackstone acted as an adviser for AIG during the 2007-2008 financial crisis.

In March 2003 American General merged with Old Line Life Insurance Company.

In November 2004, AIG reached a US$126 million settlement with the U.S. Securities and Exchange Commission and the Justice Department partly resolving a number of regulatory matters, but the company must still cooperate with investigators continuing to probe the sale of a non-traditional insurance product.

Accounting scandal

In 2005, AIG became embroiled in a series of fraud investigations conducted by the Securities and Exchange Commission, U.S. Justice Department, and New York State Attorney General's Office. Greenberg was ousted amid an accounting scandal in February 2005. The New York Attorney General's investigation led to a $1.6 billion fine for AIG and criminal charges for some of its executives.

On May 1, 2005, investigations conducted by outside counsel at the request of AIG's Audit Committee and the consultation with AIG's independent auditors, PricewaterhouseCoopers LLP resulted in AIG's decision to restate its financial statements for the years ended December 31, 2003, 2002, 2001 and 2000, the quarters ended March 31, June 30 and September 30, 2004 and 2003 and the quarter ended December 31, 2003. On November 9, 2005, the company was said to have delayed its third-quarter earnings report because it had to restate earlier financial results, to correct accounting errors.

Expansion to the credit default insurance market

Martin J. Sullivan became CEO of the company in 2005. He began his career at AIG as a clerk in its London office in 1970. AIG then took on tens of billions of dollars of risk associated with mortgages. It insured tens of billions of dollars of derivatives against default, but did not purchase reinsurance to hedge that risk. Secondly, it used collateral on deposit to buy mortgage-backed securities. When losses hit the mortgage market in 2007-2008, AIG had to pay out insurance claims and also replace the losses in its collateral accounts.

AIG purchased the remaining 39% that it did not own of online auto insurance specialist 21st Century Insurance in 2007 for $749 million. With the failure of the parent company and the continuing recession in late 2008, AIG rebranded its insurance unit to 21st Century Insurance.

On June 11, 2008, three stockholders, collectively owning 4% of the outstanding stock of AIG, delivered a letter to the Board of Directors of AIG seeking to oust CEO Martin Sullivan and make certain other management and Board of Directors changes. This letter was the latest volley in what The Wall Street Journal called a "public spat" between the company's board and management, on the one hand, and its key stockholders, and former CEO Maurice Greenberg on the other hand.

On June 15, 2008, after disclosure of financial losses and subsequent to a falling stock price, Sullivan resigned and was replaced by Robert B. Willumstad, Chairman of the AIG Board of Directors since 2006. Willumstad was forced by the US government to step down and was replaced by Ed Liddy on September 17, 2008. AIG's board of directors named Bob Benmosche CEO on August 3, 2009, to replace Mr. Liddy, who earlier in the year announced his retirement.

Liquidity crisis and government bailout

In late 2008, the federal government bailed out AIG for $180 billion, and technically assumed control, because its failure would endanger the financial integrity of other major firms that were its trading partners--Goldman Sachs, Morgan Stanley, Bank of America and Merrill Lynch (as well as dozens of European banks), as described below. The Financial Crisis Inquiry Commission (FCIC) in January 2011 issued one of many critical governmental reports, deciding that AIG failed and was rescued by the government primarily because its enormous sales of credit default swaps were made without putting up the initial collateral, setting aside capital reserves, or hedging its exposure, which one analyst considered a profound failure in corporate governance, particularly its risk management practices. Other analysts believed AIG's failure was possible because of the sweeping deregulation of over-the-counter (OTC) derivatives, including credit default swaps, which effectively eliminated federal and state regulation of these products, including capital and margin requirements that would have lessened the likelihood of AIG's failure.

AIG had sold credit protection through its London unit in the form of credit default swaps (CDSs) on collateralized debt obligations (CDOs) but by 2008, they had declined in value. AIG's Financial Products division, headed by Joseph Cassano in London, had entered into credit default swaps to insure $441 billion worth of securities originally rated AAA. Of those securities, $57.8 billion were structured debt securities backed by subprime loans. As a result, AIG's credit rating was downgraded and it was required to post additional collateral with its trading counter-parties, leading to a liquidity crisis that began on September 16, 2008, and essentially bankrupted all of AIG. The New York United States Federal Reserve Bank (led by Timothy Geithner who would later become Treasury secretary) stepped in, announcing creation of a secured credit facility, initially of up to US$85 billion to prevent the company's collapse, enabling AIG to deliver additional collateral to its credit default swap trading partners. The credit facility was secured by the stock in AIG-owned subsidiaries in the form of warrants for a 79.9% equity stake in the company and the right to suspend dividends to previously issued common and preferred stock. The AIG board accepted the terms of the Federal Reserve rescue package that same day, making it the largest government bailout of a private company in U.S. history.

On March 17, 2009, AIG compounded public cynicism concerning the "too big to fail" firm's bailout by announcing that it would pay its executives over $165 million in executive bonuses. Total bonuses for the financial unit could reach $450 million, and bonuses for the entire company could reach $1.2 billion. Newly installed President Barack Obama, who had voted for TARP as a Senator responded to the planned payments by saying "[I]t's hard to understand how derivative traders at AIG warranted any bonuses, much less $165 million in extra pay. How do they justify this outrage to the taxpayers who are keeping the company afloat?" Both Democratic and Republican politicians reacted with similar outrage to the planned bonuses, as did political commentators and journalists in the AIG bonus payments controversy.

AIG began selling some assets to pay off its government loans in September 2008 despite a global decline in the valuation of insurance businesses, and the weakening financial condition of potential bidders. In December 2009, AIG formed international life insurance subsidiaries, American International Assurance Company, Limited (AIA) and American Life Insurance Company (ALICO) which were transferred to the Federal Reserve Bank of New York to reduce its debt by US$25 billion. AIG sold its Hartford Steam Boiler unit on March 31, 2009, to Munich Re for $742 million. On April 16, 2009, AIG announced plans to sell 21st Century Insurance subsidiary to Farmers Insurance Group for $1.9 billion. June 10, 2009. AIG sold down its majority ownership of reinsurer Transatlantic Re. The Wall Street Journal reported on September 7, 2009, that Pacific Century Group had agreed to pay $500 million for a part of AIG's asset management business, and that they also expected to pay an additional $200 million to AIG in carried interest and other payments linked to future performance of the business.

AIG then sold its American Life Insurance Co. (ALICO) to MetLife Inc. for $15.5 billion in cash and MetLife stock in March 2010. Bloomberg L.P. reported on March 29, 2010, that after almost three months of delays, AIG had completed the $500 million sale of a portion of its asset management business, branded PineBridge Investments, to the Asia-based Pacific Century Group. Fortress Investment Group purchased 80% of the interest in financing company American General Finance in August 2010. In September AIG sold AIG Starr and AIG Edison, two of its Japan-based companies, to Prudential Financial for $4.2 billion in cash and $600 million in assumption of third party AIG debt by Prudential. On November 1, 2010, AIG raised $36.71 billion from both the sale of ALICO and its IPO of AIA. Proceeds went to pay off FRB of New York loan.

In October 2010, The Wall Street Journal reported that the Tomlinson family was allowed to join a civil suit involving AIG for its alleged complicity in a 'stranger-originated life insurance' scheme. The case involved JB Carlson and Germaine Tomlinson, and alleged that AIG managers allowed Carlson to take out life insurance policies against Tomlinson without an insurable interest, which some labeled a "death bet." AIG initially filed a suit against Carlson in 2008 to invalidate the claim altogether, arguing that it was filed fraudulently. The case was settled and dismissed with prejudice by U.S. District Court Judge Sarah Evans Barker on May 25, 2011

AIG sold its Taiwanese life insurance company Nan Shan Life to a consortium of buyers for $2.16 billion in January 2011. Due to the Q3 2011 net loss widening, on November 3, 2011, AIG shares plunged 49 percent year to date. The insurer's board approved a share buyback of as much as $1 billion.

Nine years after the initial bailout, in 2017, the U.S. Financial Stability Oversight Council removed AIG from its list of too-big-to-fail institutions.

Modern era: 2012 to present

The United States Department of the Treasury announced an offering of 188.5 million shares of AIG for a total of $5.8 billion on May 7, 2012. The sale reduced Treasury's stake in AIG to 61 percent, from 70 percent before the transaction. Four months later, on September 6, 2012, AIG sold $2 billion of its investment in AIA to repay government loans. The board also approved a $5 billion stock repurchase of government-owned shares in AIA. The next week, on September 14, 2012, the Department of Treasury completed its fifth sale of AIG common stock, with proceeds of approximately $20.7 billion, reducing the Treasury's ownership stake in AIG to approximately 15.9 percent from 53 percent. Government commitments were fully recovered, and Treasury and the FRBNY to date had received a combined positive return of approximately $15.1 billion.

On October 12, 2012 AIG announced a five and a half year agreement to sponsor six New Zealand-based rugby teams, including world champion All Blacks. The AIG logo and the Adidas logo, the league's primary sponsor, will be displayed on the league's team jerseys.

The U.S. Department of the Treasury in December 2012 published an itemized list of the loans, stock purchases, special purpose vehicles (SPVs) and other investments engaged in with AIG, the amount AIG paid back and the positive return on the loans and investments to the government. The Treasury said that it and the Federal Reserve Bank of New York provided a total $182.3 billion to AIG, which paid back a total $205 billion, for a total positive return, or profit, to the government of $22.7 billion. In addition, AIG sold off a number of its own assets to raise money to pay back the government. On December 14, 2012, the Treasury Department sold the last of its AIG stock in its sixth stock stale for a total of approximately $7.6 billion. In total, the Treasury Department realized a gain of more than $22 billion from the sale of AIG common stock and $0.9 billion from the sale of AIG preferred stock. The same month, Robert Benmosche announced that he would be stepping down from his position as President and CEO due to his advancing lung cancer.

AIG began an advertising campaign on January 1, 2013, called "Thank You America," in which several company employees, including AIG President and CEO Robert Benmosche, talked directly to the camera and offered their thanks for the government assistance. Peter Hancock succeeded Benmosche as President and CEO of AIG in September 2014. While Benmosche stayed on in an advisory role, he passed away in February the following year.

In June 2015, Taiwan's Nan Shan Life Insurance acquired a stake in AIG's subsidiary in Taiwan for a fee of $158 million. Later that year, activist investor Carl Icahn called for a breakup of AIG, describing the company as "too big to succeed." AIG announced plans for an initial public offering of 19.9 percent of United Guaranty Corp., a Greensboro, North Carolina-based provider of mortgage insurance for lenders in January 2016. Later that year, Icahn won a seat on the board of directors and continued to pressure the company to split up its major divisions. AIG also began a joint venture with Hamilton Insurance Group and Two Sigma Investments to serve as insurance needs for small- to medium-sized enterprises. Industry veteran Brian Duperreault became the chairman of the new entity, and Richard Friesenhahn, the executive vice president of U.S. casualty lines at AIG, became CEO. In August 2016, AIG sold off United Guaranty, its mortgage-guarantee unit, to Arch Capital Group, a Bermuda-based insurer, for $3.4 billion.

Brian Duperreault was appointed CEO of AIG on May 15, 2017. That September, the company reorganized into three segments, comprising a general insurance unit, a life and retirement unit, and a stand-alone technology-focused unit.


Jersey City Branch Swift Code and BIC Code AIGXUS33
src: codessafe.com


Bailout litigation

  • Starr International Co v U.S. Federal Circuit Court of Appeals

Hank Greenberg, with lead lawyer David Boies, independently sued the U.S. Government for money damages in the United States Court of Federal Claims in 2011. The AIG board had announced on January 9 that the company would not join the lawsuit. After hearing thirty-seven days of testimony from Ben Bernanke, Timothy Geithner, Hank Paulson and others, Judge Thomas C. Wheeler ruled that the Federal Reserve payment to AIG had been an illegal exaction, as the Federal Reserve Act did not authorize the New York Fed to nationalize a corporation by owning its stock. Judge Wheeler did not award compensation to the plaintiffs, ruling that they did not suffer economic damage because "if the government had done nothing, the shareholders would have been left with 100 percent of nothing."

Greenberg and the U.S. Government appealed to the Court of Appeals for the Federal Circuit, which ruled that Greenberg had no legal right to challenge the bailout because that right belonged to AIG, which in this case, chose not to sue.

  • AIG Inc. et al. v. Maiden Lane II LLC

AIG filed suit against the New York Federal Reserve in January 2013 in order to maintain the former's right to sue Bank of America and other issuers of bad mortgage debt. The specific issue was whether the New York Federal Reserve transferred $18 billion in litigation claims on troubled mortgage debt through Maiden Lane Transactions, entities created by the Fed in 2008. This transaction, AIG argued, prevented them from recouping losses from insured banks. Owing to events which allowed AIG to proceed in another related case (see below), AIG withdrew the Maiden Lane case "without prejudice" on May 28, 2013.

  • AIG Inc. v. Bank of America Corporation LLC

On May 7, 2013, Los Angeles U.S. District Judge, Mariana Pfaelzer, ruled in a case between AIG and Bank of America concerning possible misrepresentations by Merrill Lynch and Countrywide as to the quality of the mortgage portfolio, that $7.3 billion of the disputed claims had not been assigned. The two parties settled in July 2014, with Bank of America paying out $650 million to AIG, who in turn dismissed their litigation.


AIG - Insurancetuk
src: insurancetuk.com


Corporate governance

Board of directors

  • Brian Duperreault - President and Chief Executive Officer, American International Group, Inc.
  • W. Don Cornwell - Former Chairman of the Board and Chief Executive Officer, Granite Broadcasting Corporation
  • Peter R. Fischer - Former Head of Fixed Income Portfolio Management, Blackrock Inc.
  • John H. Fitzpatrick - Chairman, Oak Street Management Co., LLC
  • Christopher S. Lynch - Former Partner, KPMG LLP
  • Samuel J. Merksamer - Managing Director of Icahn Capital LP
  • Henry S. Miller - Chairman, Marblegate Asset Management, LLC
  • Linda A. Mills - Former Vice President of Operations, Northrop Grumman Corporation
  • Suzanne Nora Johnson - Former Vice Chairman, The Goldman Sachs Group, Inc.
  • Ronald A. Rittenmeyer - Former Chairman, Chief Executive Officer and President, Electronic Data Systems Corporation
  • Douglas Steenland - Former President and Chief Executive Officer, Northwest Airlines Corporation
  • Theresa M. Stone - Former Executive Vice President and Treasurer, Massachusetts Institute of Technology
  • William G. Jurgensen - Former Chief Executive Officer Nationwide Insurance

As of January 23, 2018


American International Group, Multi-Insurance and Services - QuotedG
src: i1.wp.com


Business

In Australia and China, AIG is identified as a large financial institution and provider financial services including credit security mechanisms. In the United States, AIG is the largest underwriter of commercial and industrial insurance.

AIG offers property casualty insurance, life insurance, retirement products, mortgage insurance and other financial services. In the third quarter of 2012, the global property-and-casualty insurance business, Chartis, was renamed AIG Property Casualty. SunAmerica, life-insurance and retirement-services division, was renamed AIG Life and Retirement, other existing brands continue to be used in certain geographies and market segments.


American International Group, Inc. â€
src: i.pinimg.com


Subsidiaries

  • AIG Europe Limited
  • AIU Insurance Company
  • American General Life Insurance Company
  • American Home Assurance Company
  • Fuji Fire and Marine Insurance Company
  • Lexington Insurance Company
  • National Union Fire Insurance Company of Pittsburgh, PA
  • The United States Life Insurance Company in the City of New York
  • The Variable Annuity Life Insurance Company (VALIC)

American International Group Inc 2016 Q2 - Results - Earnings Call ...
src: static2.seekingalpha.com


See also

  • Bailout
  • Late-2000s financial crisis
  • List of United States insurance companies

AIG - SlideGenius PowerPoint Design & Presentation Experts
src: 2ch0ii35pfo82tskhvz2b23217-wpengine.netdna-ssl.com


References


8685 / American International Group,inc. - Stock News and Filings ...
src: staticx-tuner.zacks.com


Further reading

  • Angelides, Phil (2011). Financial Crisis Inquiry Report. DIANE Publishing. ISBN 978-1-4379-8072-1. 
  • Cunningham, Lawrence A.; Greenberg, Maurice R. (2013). The AIG story. Hoboken, N.J.: John Wiley & Sons. ISBN 978-1118345870. 
  • Sjostrom, Jr., William K. "The AIG Bailout". SSRN 1346552 .  (2009)
  • "An Insurance Giant, Brought Down". The New York Times. September 27, 2008. Archived from the original on September 30, 2008. Retrieved September 27, 2008.  (Graphic)
  • "Losses in Perspective" New York Times. September 17, 2008. (Graphic of AIG quarterly net profit & losses over five years, comparing Finance vs. Insurance activities.)
  • Marsh, Bill (September 28, 2008). "A Tally of Federal Rescues". The New York Times. Archived from the original on October 1, 2008. Retrieved September 28, 2008. 
  • Schneiderman, R.M; Caulfield, Philip; Fang, Celena; Goodridge, Elisabeth; Bajaj, Vikas (September 15, 2008). "How a Market Crisis Unfolded: Some of the key events in the upheaval". The New York Times. Archived from the original on September 16, 2008. Retrieved September 17, 2008.  (Graphic and interactive timeline.)
  • Boyd, Roddy (2011). Fatal Risk: A Cautionary Tale of AIG's Corporate Suicide. Hoboken, NJ: Wiley. ISBN 978-0-470-88980-0. 
  • Shelp, Ron (2006). Fallen Giant: The Amazing Story of Hank Greenberg and the History of AIG. Hoboken, NJ: Wiley. ISBN 0-471-91696-X. 
  • For a list of counterparties receiving U.S. taxpayer dollars, see: Business Week - List of Counterparties and Payouts

Aig American Insurance Group - Insurance Quotes and Comparison
src: exithub.com


External links

  • Official website

Source of article : Wikipedia

Waterfront Blues Festival

Waterfront Blues Festival - Wikipedia
src: upload.wikimedia.org

The Waterfront Blues Festival is an annual event in Portland, Oregon, United States featuring three to five days of performances by blues musicians. The festival started in 1988 and takes place in Tom McCall Waterfront Park, along the west bank of the Willamette River in downtown Portland. It is the largest blues festival on the West Coast and the second-largest blues festival in the nation, with recent events attracting 120,000 blues fans from throughout the world with more than 150 performances on four stages. The festival benefits the Oregon Food Bank, a non-profit organization which provides food to low-income persons in Oregon and SW Washington states.


Video Waterfront Blues Festival



History

The festival began in 1987 as the Rose City Blues Festival, sponsored by the Cascade Blues Association, to benefit the Burnside Community Council's projects for the homeless. The FM community radio station KBOO has broadcast performances from the event, throughout the festival's history. The following year, Oregon Food Share (predecessor of the Oregon Food Bank) becomes the beneficiary of the Rose City Blues Festival, making the event Oregon's first annual blues festival to benefit the hungry. In 1991, the name was changed to the Waterfront Blues Festival.

The festival celebrated its twentieth anniversary in 2007, earning the Rose City Award from the Portland Oregon Visitors Association and an official U.S. Post Office postmark commemorating the festival. Sponsors of the festival have included Miller Genuine Draft, Albertsons, and Safeway. Throughout its history, the festival has raised millions of dollars and hundreds of thousands pounds of food.


Maps Waterfront Blues Festival



See also

  • List of blues festivals
  • Mt. Hood Jazz Festival

Portland's Waterfront Blues Festival - YouTube
src: i.ytimg.com


References


Help Fight Hunger with a World-Class Waterfront Blues Festival ...
src: www.uniqueinns.com


External links

  • Media related to Waterfront Blues Festival at Wikimedia Commons

Source of article : Wikipedia

Wetting

Nice Wetting The Bed 8 | savoypdx.com
src: www.savoypdx.com

Wetting is the ability of a liquid to maintain contact with a solid surface, resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces. Wetting deals with the three phases of materials: gas, liquid, and solid. It is now a center of attention in nanotechnology and nanoscience studies due to the advent of many nanomaterials in the past two decades (e.g. graphene, carbon nanotube, boron nitride nanomesh).

Wetting is important in the bonding or adherence of two materials. Wetting and the surface forces that control wetting are also responsible for other related effects, including capillary effects.

There are two types of wetting: non-reactive wetting and active wetting.


Video Wetting



Explanation

Adhesive forces between a liquid and solid cause a liquid drop to spread across the surface. Cohesive forces within the liquid cause the drop to ball up and avoid contact with the surface.

The contact angle (?), as seen in Figure 1, is the angle at which the liquid-vapor interface meets the solid-liquid interface. The contact angle is determined by the balance between adhesive and cohesive forces. As the tendency of a drop to spread out over a flat, solid surface increases, the contact angle decreases. Thus, the contact angle provides an inverse measure of wettability.

A contact angle less than 90° (low contact angle) usually indicates that wetting of the surface is very favorable, and the fluid will spread over a large area of the surface. Contact angles greater than 90° (high contact angle) generally means that wetting of the surface is unfavorable, so the fluid will minimize contact with the surface and form a compact liquid droplet.

For water, a wettable surface may also be termed hydrophilic and a nonwettable surface hydrophobic. Superhydrophobic surfaces have contact angles greater than 150°, showing almost no contact between the liquid drop and the surface. This is sometimes referred to as the "Lotus effect". The table describes varying contact angles and their corresponding solid/liquid and liquid/liquid interactions. For nonwater liquids, the term lyophilic is used for low contact angle conditions and lyophobic is used when higher contact angles result. Similarly, the terms omniphobic and omniphilic apply to both polar and apolar liquids.


Maps Wetting



High-energy vs. low-energy surfaces

Liquids can interact with two main types of solid surfaces. Traditionally, solid surfaces have been divided into high-energy solids and low-energy types. The relative energy of a solid has to do with the bulk nature of the solid itself. Solids such as metals, glasses, and ceramics are known as 'hard solids' because the chemical bonds that hold them together (e.g., covalent, ionic, or metallic) are very strong. Thus, it takes a large input of energy to break these solids (alternatively large amount of energy is required to cut the bulk and make two separate surfaces so high surface energy), so they are termed "high energy". Most molecular liquids achieve complete wetting with high-energy surfaces.

The other type of solids is weak molecular crystals (e.g., fluorocarbons, hydrocarbons, etc.) where the molecules are held together essentially by physical forces (e.g., van der Waals and hydrogen bonds). Since these solids are held together by weak forces, a very low input of energy is required to break them, thus they are termed "low energy". Depending on the type of liquid chosen, low-energy surfaces can permit either complete or partial wetting.

Dynamic surfaces have been reported that undergo changes in surface energy upon the application of an appropriate stimuli. For example, a surface presenting photon-driven molecular motors was shown to undergo changes in water contact angle when switched between bistable conformations of differing surface energies.

Wetting of low-energy surfaces

Low-energy surfaces primarily interact with liquids through dispersion (van der Waals) forces. William Zisman had several key findings in the work that he did:

Zisman observed that cos ? increases linearly as the surface tension (?LV) of the liquid decreased. Thus, he was able to establish a linear function between cos ? and the surface tension (?LV) for various organic liquids.

A surface is more wettable when ?LV and ? is low. Zisman termed the intercept of these lines when cos ? = 1, as the critical surface tension (?c) of that surface. This critical surface tension is an important parameter because it is a characteristic of only the solid.

Knowing the critical surface tension of a solid, it is possible to predict the wettability of the surface. The wettability of a surface is determined by the outermost chemical groups of the solid. Differences in wettability between surfaces that are similar in structure are due to differences in the packing of the atoms. For instance, if a surface has branched chains, it will have poorer packing than a surface with straight chains. Lower critical surface tension means a less wettable material surface.


Wetting The Bed When Drunk Boys At Age 7 9 | Savoypdx.com
src: www.savoypdx.com


Ideal solid surfaces

An ideal surface is flat, rigid, perfectly smooth, and chemically homogeneous, and has zero contact angle hysteresis. Zero hysteresis implies the advancing and receding contact angles are equal. In other words, only one thermodynamically stable contact angle exists. When a drop of liquid is placed on such a surface, the characteristic contact angle is formed as depicted in Fig. 1. Furthermore, on an ideal surface, the drop will return to its original shape if it is disturbed. The following derivations apply only to ideal solid surfaces; they are only valid for the state in which the interfaces are not moving and the phase boundary line exists in equilibrium.

Minimization of energy, three phases

Figure 3 shows the line of contact where three phases meet. In equilibrium, the net force per unit length acting along the boundary line between the three phases must be zero. The components of net force in the direction along each of the interfaces are given by:

? ? ? + ? ? ? cos ( ? ) + ? ? ? cos ( ? ) = 0 ? ? ? cos ( ? ) + ? ? ? + ? ? ? cos ( ? ) = 0 ? ? ? cos ( ? ) + ? ? ? cos ( ? ) + ? ? ? = 0 {\displaystyle {\begin{aligned}\gamma _{\alpha \theta }+\gamma _{\theta \beta }\cos \left(\theta \right)+\gamma _{\alpha \beta }\cos \left(\alpha \right)&=0\\\gamma _{\alpha \theta }\cos \left(\theta \right)+\gamma _{\theta \beta }+\gamma _{\alpha \beta }\cos \left(\beta \right)&=0\\\gamma _{\alpha \theta }\cos \left(\alpha \right)+\gamma _{\theta \beta }\cos \left(\beta \right)+\gamma _{\alpha \beta }&=0\end{aligned}}}

where ?, ?, and ? are the angles shown and ?ij is the surface energy between the two indicated phases. These relations can also be expressed by an analog to a triangle known as Neumann's triangle, shown in Figure 4. Neumann's triangle is consistent with the geometrical restriction that ? + ? + ? = 2 ? {\displaystyle \alpha +\beta +\theta =2\pi } , and applying the law of sines and law of cosines to it produce relations that describe how the interfacial angles depend on the ratios of surface energies.

Because these three surface energies form the sides of a triangle, they are constrained by the triangle inequalities, ?ij < ?jk + ?ik meaning that not one of the surface tensions can exceed the sum of the other two. If three fluids with surface energies that do not follow these inequalities are brought into contact, no equilibrium configuration consistent with Figure 3 will exist.

Simplification to planar geometry, Young's relation

If the ? phase is replaced by a flat rigid surface, as shown in Figure 5, then ? = ?, and the second net force equation simplifies to the Young equation,

? S G = ? S L + ? L G cos ( ? ) {\displaystyle \gamma _{SG}=\gamma _{SL}+\gamma _{LG}\cos \left(\theta \right)}

which relates the surface tensions between the three phases: solid, liquid and gas. Subsequently, this predicts the contact angle of a liquid droplet on a solid surface from knowledge of the three surface energies involved. This equation also applies if the "gas" phase is another liquid, immiscible with the droplet of the first "liquid" phase.

Non-ideal smooth surfaces and the Young contact angle

The Young equation assumes a perfectly flat and rigid surface often referred to as an ideal surface. In many cases, surfaces are far from this ideal situation, and two are considered here: the case of rough surfaces and the case of smooth surfaces that are still real (finitely rigid). Even in a perfectly smooth surface, a drop will assume a wide spectrum of contact angles ranging from the so-called advancing contact angle, ? A {\displaystyle \theta _{\mathrm {A} }} , to the so-called receding contact angle, ? R {\displaystyle \theta _{\mathrm {R} }} . The equilibrium contact angle ( ? c {\displaystyle \theta _{\mathrm {c} }} ) can be calculated from ? A {\displaystyle \theta _{\mathrm {A} }} and ? R {\displaystyle \theta _{\mathrm {R} }} as was shown by Tadmor as,

? c = arccos ( r A cos ( ? A ) + r R cos ( ? R ) r A + r R ) {\displaystyle \theta _{\mathrm {c} }=\arccos \left({\frac {r_{\mathrm {A} }\cos \left(\theta _{\mathrm {A} }\right)+r_{\mathrm {R} }\cos \left(\theta _{\mathrm {R} }\right)}{r_{\mathrm {A} }+r_{\mathrm {R} }}}\right)}

where

r A = ( sin 3 ( ? A ) 2 - 3 cos ( ? A ) + cos 3 ( ? A ) ) 1 3   ;     r R = ( sin 3 ( ? R ) 2 - 3 cos ( ? R ) + cos 3 ( ? R ) ) 1 3 {\displaystyle r_{\mathrm {A} }=\left({\frac {\sin ^{3}\left(\theta _{\mathrm {A} }\right)}{2-3\cos \left(\theta _{\mathrm {A} }\right)+\cos ^{3}\left(\theta _{\mathrm {A} }\right)}}\right)^{\frac {1}{3}}~;~~r_{\mathrm {R} }=\left({\frac {\sin ^{3}\left(\theta _{\mathrm {R} }\right)}{2-3\cos \left(\theta _{\mathrm {R} }\right)+\cos ^{3}\left(\theta _{\mathrm {R} }\right)}}\right)^{\frac {1}{3}}}

The Young-Dupré equation and spreading coefficient

The Young-Dupré equation (Thomas Young 1805; Anthanase Dupré and Paul Dupré 1869) dictates that neither ?SG nor ?SL can be larger than the sum of the other two surface energies. The consequence of this restriction is the prediction of complete wetting when ?SG > ?SL + ?LG and zero wetting when ?SL > ?SG + ?LG. The lack of a solution to the Young-Dupré equation is an indicator that there is no equilibrium configuration with a contact angle between 0 and 180° for those situations.

A useful parameter for gauging wetting is the spreading parameter S,

S = ? S G - ( ? S L + ? L G ) {\displaystyle S=\gamma _{SG}-\left(\gamma _{SL}+\gamma _{LG}\right)}

When S > 0, the liquid wets the surface completely (complete wetting). When S < 0, partial wetting occurs.

Combining the spreading parameter definition with the Young relation yields the Young-Dupré equation:

S = ? L G ( cos ( ? ) - 1 ) {\displaystyle S=\gamma _{LG}\left(\cos \left(\theta \right)-1\right)}

which only has physical solutions for ? when S < 0.


StoryTime: Wetting Myself During Class - YouTube
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Non-ideal rough solid surfaces

Unlike ideal surfaces, real surfaces do not have perfect smoothness, rigidity, or chemical homogeneity. Such deviations from ideality result in phenomenon called contact-angle hysteresis, which is defined as the difference between the advancing (?a) and receding (?r) contact angles

H = ? a - ? r {\displaystyle {\text{H}}=\,\theta _{a}-\,\theta _{r}}

In simpler terms, contact angle hysteresis is essentially the displacement of a contact line such as the one in Figure 3, by either expansion or retraction of the droplet. Figure 6 depicts the advancing and receding contact angles. The advancing contact angle is the maximum stable angle, whereas the receding contact angle is the minimum stable angle. Contact-angle hysteresis occurs because many different thermodynamically stable contact angles are found on a nonideal solid. These varying thermodynamically stable contact angles are known as metastable states.

Such motion of a phase boundary, involving advancing and receding contact angles, is known as dynamic wetting. When a contact line advances, covering more of the surface with liquid, the contact angle is increased and generally is related to the velocity of the contact line. If the velocity of a contact line is increased without bound, the contact angle increases, and as it approaches 180°, the gas phase will become entrained in a thin layer between the liquid and solid. This is a kinetic nonequilibrium effect which results from the contact line moving at such a high speed that complete wetting cannot occur.

A well-known departure from ideality is when the surface of interest has a rough texture. The rough texture of a surface can fall into one of two categories: homogeneous or heterogeneous. A homogeneous wetting regime is where the liquid fills in the roughness grooves of a surface. A heterogeneous wetting regime, though, is where the surface is a composite of two types of patches. An important example of such a composite surface is one composed of patches of both air and solid. Such surfaces have varied effects on the contact angles of wetting liquids. Cassie-Baxter and Wenzel are the two main models that attempt to describe the wetting of textured surfaces. However, these equations only apply when the drop size is sufficiently large compared with the surface roughness scale. When the droplet size is comparable to that of the underlying pillars, the effect of line tension should be considered. .

Wenzel's model

The Wenzel model (Robert N. Wenzel 1936) describes the homogeneous wetting regime, as seen in Figure 7, and is defined by the following equation for the contact angle on a rough surface:

cos ( ? * ) = r cos ( ? ) {\displaystyle \cos \,\left(\theta ^{*}\right)=r\cos \,\left(\theta \right)}

where ? * {\displaystyle \theta ^{*}} is the apparent contact angle which corresponds to the stable equilibrium state (i.e. minimum free energy state for the system). The roughness ratio, r, is a measure of how surface roughness affects a homogeneous surface. The roughness ratio is defined as the ratio of true area of the solid surface to the apparent area.

? is the Young contact angle as defined for an ideal surface. Although Wenzel's equation demonstrates the contact angle of a rough surface is different from the intrinsic contact angle, it does not describe contact angle hysteresis.

Cassie-Baxter model

When dealing with a heterogeneous surface, the Wenzel model is not sufficient. A more complex model is needed to measure how the apparent contact angle changes when various materials are involved. This heterogeneous surface, like that seen in Figure 8, is explained using the Cassie-Baxter equation (Cassie's law):

cos ( ? * ) = r f f cos ( ? Y ) + f - 1 {\displaystyle \cos \,\left(\theta ^{*}\right)=r_{f}\,f\,\cos \,\left(\theta _{\text{Y}}\right)+f-1}

Here the rf is the roughness ratio of the wet surface area and f is the fraction of solid surface area wet by the liquid. It is important to realize that when f = 1 and rf = r, the Cassie-Baxter equations becomes the Wenzel equation. On the other hand, when there are many different fractions of surface roughness, each fraction of the total surface area is denoted by f i {\displaystyle f_{i}} .

A summation of all fi equals 1 or the total surface. Cassie-Baxter can also be recast in the following equation:

? cos ( ? * ) = ? n = 1 N f i ( ? i,sv - ? i,sl ) {\displaystyle \gamma \cos \,\left(\theta ^{*}\right)=\sum _{n=1}^{N}f_{i}\left(\gamma _{\text{i,sv}}-\gamma _{\text{i,sl}}\right)}

Here ? is the Cassie-Baxter surface tension between liquid and vapor, the ?i,sv is the solid vapor surface tension of every component and ?i,sl is the solid liquid surface tension of every component. A case that is worth mentioning is when the liquid drop is placed on the substrate and creates small air pockets underneath it. This case for a two-component system is denoted by:

? cos ( ? * ) = f 1 ( ? 1,sv - ? 1,sl ) - ( 1 - f 1 ) ? {\displaystyle \gamma \cos \,\left(\theta ^{*}\right)=f_{1}\left(\gamma _{\text{1,sv}}-\gamma _{\text{1,sl}}\right)-\left(1-f_{1}\right)\gamma }

Here the key difference to notice is that there is no surface tension between the solid and the vapor for the second surface tension component. This is because of the assumption that the surface of air that is exposed is under the droplet and is the only other substrate in the system. Subsequently, the equation is then expressed as (1 - f). Therefore, the Cassie equation can be easily derived from the Cassie-Baxter equation. Experimental results regarding the surface properties of Wenzel versus Cassie-Baxter systems showed the effect of pinning for a Young angle of 180 to 90°, a region classified under the Cassie-Baxter model. This liquid/air composite system is largely hydrophobic. After that point, a sharp transition to the Wenzel regime was found where the drop wets the surface, but no further than edges of the drop.

Precursor film

With the advent of high resolution imaging, researchers have started to obtain experimental data which have led them to question the assumptions of the Cassie-Baxter equation when calculating the apparent contact angle. These groups believe the apparent contact angle is largely dependent on the triple line. The triple line, which is in contact with the heterogeneous surface, cannot rest on the heterogeneous surface like the rest of the drop. In theory, it should follow the surface imperfection. This bending in triple line is unfavorable and is not seen in real-world situations. A theory that preserves the Cassie-Baxter equation while at the same time explaining the presence of minimized energy state of the triple line hinges on the idea of a precursor film. This film of submicrometer thickness advances ahead of the motion of the droplet and is found around the triple line. Furthermore, this precursor film allows the triple line to bend and take different conformations that were originally considered unfavorable. This precursor fluid has been observed using environmental scanning electron microscopy (ESEM) in surfaces with pores formed in the bulk. With the introduction of the precursor film concept, the triple line can follow energetically feasible conformations and thereby correctly explaining the Cassie-Baxter model.

"Petal effect" vs. "lotus effect"

The intrinsic hydrophobicity of a surface can be enhanced by being textured with different length scales of roughness. The red rose takes advantage of this by using a hierarchy of micro- and nanostructures on each petal to provide sufficient roughness for superhydrophobicity. More specifically, each rose petal has a collection of micropapillae on the surface and each papilla, in turn, has many nanofolds. The term "petal effect" describes the fact that a water droplet on the surface of a rose petal is spherical in shape, but cannot roll off even if the petal is turned upside down. The water drops maintain their spherical shape due to the superhydrophobicity of the petal (contact angle of about 152.4°), but do not roll off because the petal surface has a high adhesive force with water.

When comparing the "petal effect" to the "lotus effect", it is important to note some striking differences. The surface structure of the lotus leaf and the rose petal, as seen in Figure 9, can be used to explain the two different effects. The lotus petal has a randomly rough surface and low contact angle hysteresis, which means the water droplet is not able to wet the microstructure spaces between the spikes. This allows air to remain inside the texture, causing a heterogeneous surface composed of both air and solid. As a result, the adhesive force between the water and the solid surface is extremely low, allowing the water to roll off easily (i.e. "self-cleaning" phenomenon).

The rose petal's micro- and nanostructures are larger in scale than those of the lotus leaf, which allows the liquid film to impregnate the texture. However, as seen in Figure 9, the liquid can enter the larger-scale grooves, but it cannot enter into the smaller grooves. This is known as the Cassie impregnating wetting regime. Since the liquid can wet the larger-scale grooves, the adhesive force between the water and solid is very high. This explains why the water droplet will not fall off even if the petal is tilted at an angle or turned upside down. This effect will fail if the droplet has a volume larger than 10 µl because the balance between weight and surface tension is surpassed.

Cassie-Baxter to Wenzel transition

In the Cassie-Baxter model, the drop sits on top of the textured surface with trapped air underneath. During the wetting transition from the Cassie state to the Wenzel state, the air pockets are no longer thermodynamically stable and liquid begins to nucleate from the middle of the drop, creating a "mushroom state" as seen in Figure 10. The penetration condition is given by:

cos ( ? C ) = ? - 1 r - ? {\displaystyle \cos \,\left(\theta _{\text{C}}\right)={\frac {\phi -1}{r-\phi }}}

where

  • ?C is the critical contact angle
  • ? is the fraction of solid/liquid interface where drop is in contact with surface
  • r is solid roughness (for flat surface, r = 1)

The penetration front propagates to minimize the surface energy until it reaches the edges of the drop, thus arriving at the Wenzel state. Since the solid can be considered an absorptive material due to its surface roughness, this phenomenon of spreading and imbibition is called hemiwicking. The contact angles at which spreading/imbibition occurs are between 0 and ?/2.

The Wenzel model is valid between ?C and ?/2. If the contact angle is less than ?C, the penetration front spreads beyond the drop and a liquid film forms over the surface. Figure 11 depicts the transition from the Wenzel state to the surface film state. The film smoothes the surface roughness and the Wenzel model no longer applies. In this state, the equilibrium condition and Young's relation yields:

cos ( ? * ) = ? cos ( ? C ) + ( 1 - ? ) {\displaystyle \cos \,\left(\theta ^{*}\right)=\phi \cos \,\left(\theta _{C}\right)+\left(1-\phi \right)}

By fine-tuning the surface roughness, it is possible to achieve a transition between both superhydrophobic and superhydrophilic regions. Generally, the rougher the surface, the more hydrophobic it is.


Catherine] 1st Day - 8:10
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Spreading dynamics

If a drop is placed on a smooth, horizontal surface, it is generally not in the equilibrium state. Hence, it spreads until an equilibrium contact radius is reached (partial wetting). While taking into account capillary, gravitational, and viscous contributions, the drop radius as a function of time can be expressed as

r ( t ) = r e [ 1 - exp ( - ( 2 ? L G r e 12 + ? g 9 r e 10 ) 24 ? V 4 ( t + t 0 ) ? 2 ? ) ] 1 6 {\displaystyle r(t)=r_{e}\left[1-\exp \left(-\left({\frac {2\gamma _{LG}}{r_{e}^{12}}}+{\frac {\rho g}{9r_{e}^{10}}}\right){\frac {24\lambda V^{4}\left(t+t_{0}\right)}{\pi ^{2}\eta }}\right)\right]^{\frac {1}{6}}}

For the complete wetting situation, the drop radius at any time during the spreading process is given by

r ( t ) = [ ( ? L G 96 ? V 4 ? 2 ? ( t + t 0 ) ) 1 2 + ( ? ( t + t 0 ) ? ) 2 3 24 ? g V 3 8 7 ? 96 1 3 ? 4 3 ? L G 1 3 ] 1 6 {\displaystyle r(t)=\left[\left(\gamma _{LG}{\frac {96\lambda V^{4}}{\pi ^{2}\eta }}\left(t+t_{0}\right)\right)^{\frac {1}{2}}+\left({\frac {\lambda (t+t_{0})}{\eta }}\right)^{\frac {2}{3}}{\frac {24\rho gV^{\frac {3}{8}}}{7\cdot 96^{\frac {1}{3}}\pi ^{\frac {4}{3}}\gamma _{LG}^{\frac {1}{3}}}}\right]^{\frac {1}{6}}}

where

  • ?LG is surface tension of the fluid
  • V is drop volume
  • ? is viscosity of the fluid
  • ? is density of the fluid
  • g is gravitational constant
  • ? is shape factor, 37.1 m-1
  • t0 is experimental delay time
  • re is drop radius in equilibrium

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Modifying wetting properties

Surfactants

Many technological processes require control of liquid spreading over solid surfaces. When a drop is placed on a surface, it can completely wet, partially wet, or not wet the surface. By reducing the surface tension with surfactants, a nonwetting material can be made to become partially or completely wetting. The excess free energy (?) of a drop on a solid surface is:

? = ? S + P V + ? R 2 ( ? SL - ? SV ) {\displaystyle \sigma =\gamma S+PV+\pi \,R^{2}\left(\gamma _{\text{SL}}-\gamma _{\text{SV}}\right)}
  • ? is the liquid-vapor interfacial tension
  • ?SL is the solid-liquid interfacial tension
  • ?SV is the solid-vapor interfacial tension
  • S is the area of liquid-vapor interface
  • P is the excess pressure inside liquid
  • R is the radius of droplet base

Based on this equation, the excess free energy is minimized when ? decreases, ?SL decreases, or ?SV increases. Surfactants are absorbed onto the liquid-vapor, solid-liquid, and solid-vapor interfaces, which modify the wetting behavior of hydrophobic materials to reduce the free energy. When surfactants are absorbed onto a hydrophobic surface, the polar head groups face into the solution with the tail pointing outward. In more hydrophobic surfaces, surfactants may form a bilayer on the solid, causing it to become more hydrophilic. The dynamic drop radius can be characterized as the drop begins to spread. Thus, the contact angle changes based on the following equation:

cos ( ? ( t ) ) = cos ( ? 0 ) + ( cos ( ? ? ) - cos ( ? 0 ) ) ( 1 - e - t ? ) {\displaystyle \cos \,\left(\theta (t)\right)=\cos \,\left(\theta _{0}\right)+\left(\cos \,\left(\theta _{\infty }\right)-\cos \,\left(\theta _{0}\right)\right)\left(1-\mathrm {e} ^{-{\frac {t}{\tau }}}\right)}
  • ?0 is initial contact angle
  • ?? is final contact angle
  • ? is the surfactant transfer time scale

As the surfactants are absorbed, the solid-vapor surface tension increases and the edges of the drop become hydrophilic. As a result, the drop spreads.

Surface changes

Ferrocene is a redox-active organometallic compound which can be incorporated into various monomers and used to make polymers which can be tethered onto a surface. Vinylferrocene (ferroceneylethene) can be prepared by a Wittig reaction and then polymerised to form polyvinylferrocene (PVFc), an analogue of polystyrene. Another polymer which can be formed is poly(2-(methacryloyloxy)ethyl ferrocenecarboxylate), PFcMA. Both PVFc and PFcMA have been tethered onto silica wafers and the wettability measured when the polymer chains are uncharged and when the ferrocene moieties are oxidised to produce positively charged groups, as illustrated at right. The contact angle with water on the PFcMA-coated wafers was 70° smaller following oxidation, while in the case of PVFc the decrease was 30°, and the switching of wettability has been shown to be reversible. In the PFcMA case, the effect of longer chains with more ferrocene groups (and also greater molar mass) has been investigated, and it was found that longer chains produce significantly larger contact angle reductions.


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See also

  • Adsorption
  • Amott index
  • Anti-fog
  • Dewetting
  • Electrowetting
  • Flotation
  • Sessile drop technique
  • Soap bubble
  • Rise in core
  • Wetting current and voltage

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References


How to Stop Wetting the Bed
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Further reading

  • de Gennes, Pierre-Gilles; Brochard-Wyart, Françoise; Quéré, David (2004). Capillarity and Wetting Phenomena. Springer New York. doi:10.1007/978-0-387-21656-0. ISBN 978-1-4419-1833-8. 
  • Victor M. Starov; Manuel G. Velarde; Clayton J. Radke (2 April 2007). Wetting and Spreading Dynamics. CRC Press. ISBN 978-1-4200-1617-8. 

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External links

  • Media related to Wetting at Wikimedia Commons

Source of article : Wikipedia