三门峡青春痘咨询北方f8(三门峡腋臭治疗专家) (今日更新中)

SAN FRANCISCO, Sept. 13 (Xinhua) -- Microsoft released on Tuesday a test version of Windows 8 to developers, posing to regain ground of the tablet market dominated by Apple and Google.At its developer-focused BUILD conference held in Anaheim, California, the software giant handed out new Samsung tablet computers with a test version of the code-named "Windows 8," the first detailed preview of the system for developers and people outside Microsoft.Generally expected to be launched in fall 2012, Microsoft did not say when the system will ship or its price.Microsoft Windows President Steven Sinofsky introduces the new tablet running a test version of its touch-enabled Windows 8 at the Build conference in Anaheim, California September 13, 2011Featuring a home page filled with colorful application tiles, the new system boots up in seconds. Microsoft said the system will run on low-power ARM-based chips that power smartphones and tablets. Windows 8 also introduces a new "Metro style" interface, which run full-screen and users can multitask in two at a time."We reimagined Windows," said Steven Sinofsky, president of the Windows and Windows Live Division at Microsoft, in his keynote address to the thousands of developers in attendance. "From the chipset to the user experience, Windows 8 brings a new range of capabilities without compromise."Analysts said the new system is consumer-oriented and intuitive but it will take time to see whether it is an "iPad killer."As professionals and consumers began to spend more time on smartphones and tablets, Microsoft has not got a significant bite of the market, losing ground to Apple's iPad and devices running Google's Android system.

SAN FRANCISCO, July 15 (Xinhua) -- U.S. microblogging platform Twitter on Friday marked its fifth anniversary since public debut."Twitter, then called Twttr, opened to the public five years ago today," the company said in a Tweet, a short message within 140 characters users are allowed to communicate on the website."Twttr is a new mobile service that helps groups of friends bounce random thoughts around with SMS," co-founder Biz Stone described the service in a blog post on July 13, 2006, two days before its public debut."There were 224 Tweets sent on July 15, 2006. Today, users send that many Tweets in less than a tenth of a second," said the San Francisco-based company.Twitter said more than 600,000 new users signed up on Thursday while it took it more than 16 months to reach the first 600,000 Twitter accounts.The tipping point for the service's popularity was the 2007 South by Southwest festival, a set of film, interactive and music festivals and conferences that take place every March in Austin, Texas. During the event, the Tweets sent per day grew from 20,000 to 60,000.With an estimated user base of 200 million worldwide, some 200 million Tweets are generated and 1.6 billion search queries are handled every day, the company said.According to research firm EMarketer, advertising sales on Twitter is expected to reach 150 million U.S. dollars this year. SharesPost, a secondary market for privately held companies, has assessed Twitter's current worth at 6.8 billion dollars.

BEIJING, Aug. 3 (Xinhuanet) -- The first man in Britain who received a complete plastic heart is allowed to leave hospital and live a relatively normal life at home.Matthew Green, 40, who was dying from arrhythmogenic right ventricular cardiomyopathy, was awaiting a transplant when his condition became so bad that the doctors at Papworth Hospital, the world renowned heart center near Cambridge, decided to give him Britain’s first ever full artificial heart.During a six-hour operation on June 9, 2011, surgeons replaced Mr Green's damaged heart with the device which will serve the role of muscles and ventricles.Unlike previous artificial hearts, they have usually only replaced parts of the organ, the new one is powered by a pump which sits outside the body and can be held in a backpack or shoulder bag.All Mr Green has to do is replace the batteries in the pump every few hours and the heart should last up to three years.Transplant milestones1964 US National Institutes of Health starts artificial heart programme.1966 First transplant of partial mechanical heart, to assist pumping of ventricle.1969 Texas man receives first total artificial heart transplant. After 64 hours on the mechanical device received a donor organ, but died within two days.1982 Artificial heart designed by Utah University doctor Robert Jarvik implanted into man who survived for 112 days.2001 First surgical implant of internally powered artificial heart, which was charged via transduction through skin.

UNITED NATIONS, June 9 (Xinhua) -- Partners from UN agencies and governments, as well as civil society and the private sector gathered here Thursday to launch "Countdown to Zero: Global plan towards the elimination of new HIV infections among children by 2015 and keeping their mothers alive.""Governments and foundations that support this plan are saying: we treasure all life equally," said UN Secretary-General Ban Ki- moon, who spoke at the event. "We give all people the best possible chance. We provide health care to all who need it."This new plan, which was formulated by a Global Task Team of more than 30 governments and 50 international and national organizations, aims to bring the number of new HIV infections in children to zero by the middle of the decade and help their mothers survive.The launch of Countdown to Zero came on the sidelines of the UN High-Level Meeting on AIDS, which runs from June 8-10, and has been an opportunity for participants to take stock of gains made in combating the disease and to agree on a declaration that will direct the actions of member states to prevent and treat HIV/AIDS over the next five years.Ban told the audience at the launch that history has proven that it is possible to make great strides in fighting HIV/AIDS, with the right amount of effort and coordination."Let us not forget that some regions have nearly achieved no new infections from mother to child," he said. "If we push hard, as we have committed today, with your continued help and with the will to do what is right for the world, we can spread this success to mothers everywhere."According to the Joint UN Program on HIV/AIDS (UNAIDS), the rate of HIV/AIDS transmission from mother to child was been reduced by 26 percent from 2001 to 2009.Former U.S. President Bill Clinton, who spoke at the launch, said that he believes the time to eliminate HIV/AIDS in children is at hand."We are here because we all recognize that the time has finally come to end pediatric AIDS worldwide and we believe we can do it," he said. "We know we have the capacity to produce the medicine, we know that."Clinton emphasized the fact that HIV/AIDS is often prevalent in less developed countries. Sub-Saharan Africa remains the region that has the most HIV/AIDS infected people."There are still too many kids who are born HIV-positive," he said. "Just 22 countries account for 90 percent of those pediatric infections."He said that there are not only moral reasons for wealthier countries to help these nations by investing in their HIV/AIDS responses, but that by doing so they increase their soft power -- influence that utilizes non-coercive measures."I think its important in a world where no one wants to look weak and the military justifiably has a claim on all of our budgets, we not forget that what my secretary-of-state often refers to as soft power issues, they have a bigger impact on our long term security," Clinton said. "I think that accounts in no small measure for the presence of leaders of global corporations here at this meeting today, they know this as well."Collaboration and close coordination of responses to HIV/AIDS, Clinton said, is also essential."There are still too many places where HIV and maternal and child health groups work completely separately," he said. "That dramatically reduces the likelihood that mothers are their babies will receive the full range of care. We simply have to all work together, both within governments and all of those who are trying to help to ensure that mothers get the drugs they should and that their babies are born without the virus."Clinton said that Goodluck Jonathan, president of Nigeria, who gave a statement at the launch as well, is an excellent example of the "strong political leadership and personal commitment" necessary to defeat HIV/AIDS and reach to goals set by the Countdown to Zero plan.In his speech, Jonathan said that Africa is has banded together through the Abuja Declaration, adopted in 2001, which turned attention and resources towards public health problems on the continent, particularly HIV/AIDS."That declaration was to make African countries spend at least 15 percent of their budget on their health sector and a reasonable percentage of this would be geared towards HIV prevention and control," he said.Budgeting shortfalls for fighting HIV/AIDS in Africa must be accounted for, Jonathan said, as African countries must not rely solely on donors to fund their responses."I intend to explore in the coming months in collaboration with colleagues in sub-Saharan Africa an effective and creative funding mechanism to ensure ownership and long terms sustainability of the HIV and AIDS response in Africa," he said.

WASHINGTON, July 7 (Xinhua) -- Space shuttle Atlantis will soar into the sky Friday on NASA's 135th and final flight. Its scheduled return to Earth later this month will mark the end of NASA's 30-year space program.Since its onset with the launch of space shuttle Columbia, the program has been seen as a cheap, safe and reliable way for space exploration.Despite its great contributions to U.S. manned space flight, it has also left some grave and tragic lessons, making its termination inevitable.HIKING COSTSLaunched in 1972 by then President Richard Nixon, the shuttle program aimed to provide a new system of affordable space travel and proved to be NASA's most enduring project in its 50 years of existence.In 1981, shuttle Columbia made its first shuttle flight for two days. It was the ultimate hybrid and the first reusable spacecraft.Launched like a rocket and gliding back to Earth like an airplane, space shuttles not only can act as a space taxi to carry astronauts, but have the muscle of a long-distance trucker to haul heavy machinery.The spaceship boasts more than 3,500 subsystems and 2.5 million parts and is nine times faster than a speeding bullet as it climbs heavenward. That versatility, however, has translated into higher costs.NASA originally estimated the program would cost about 90 billion U.S. dollars. However, its actual cost stands at about 200 billion dollars, compared with the 151 billion dollars spent on Apollo which took Americans to the moon in 1969.In an article in Technology Review, John Logsdon, former head of the Space Policy Institute at George Washington University, drew a direct connection between the ravenous shuttle budget and the lack of other large advances in manned space flight."By operating the system for 30 years, with its high costs and high risk, rather than replacing it with a less expensive, less risky second-generation system, NASA compounded the original mistake of developing the most ambitious version of the vehicle," he wrote."The shuttle's cost has been an obstacle to NASA starting other major projects," he added.HIGH RISKIn terms of safety, the shuttles have never been as reliable as their designers had envisioned.On average, one out of every 67 flights ended up with fatal accidents. Based on the rate of deaths per million miles traveled, the space shuttle is 138 times riskier than a passenger jet.Seven astronauts onboard died when Challenger exploded about a minute after launch in 1986. Nearly two decades after the tragic blast, a new catastrophe descended when the shuttle Columbia disintegrated moments before landing in 2003, killing another seven spacemen.Again, the shuttle program was shelved for more than two years as NASA stepped up efforts to make it safer. But experts say the fundamental problem related to shuttles' safety cannot be solved due to their "birth defects.""It is in the nation's interest to replace the Shuttle as soon as possible," concluded the panel that investigated the 2003 Columbia accident.

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