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千人計劃將硏究天使粒子著名物理學家張首晟推進抑鬱死亡

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發表於 2018-12-6 21:46:30 |顯示全部樓層
千人計劃將硏究天使粒子著名物理學家張首晟推進抑鬱死亡
好好地做科研咪好 一接觸共匪就死梗

著名美國匪裔物理學家、斯坦福大學教授張首晟12月1日去世,終年55歲。

就在上個月,張首晟所創立的風險投資公司受到美國政府指控幫助共匪獲得美國的尖端技術和相關知識產權。

張首晟的家人通過多家匪區媒體發表訃告,稱其與抑鬱頑強對抗後,在12月1日「意外離世」,終年55歲。

張首晟的家人在這份英文訃告中稱,張首晟「渴望通過科學研究見證世間的壯麗,他給整個世界帶來了孜孜以求的精神。」

2018年11月,美國貿易代表辦公室(USTR)更新《301調查報告》,指共匪利用風險投資幫助共匪政府獲得美國的尖端技術和相關知識產權,其中就包括丹華資本。

張首晟教授還是美國國家科學院(NAS)成員、美國人文與科學院(AAAS)院士和共匪科學院外籍院士。

涉足中美

2009年,張首晟入選俗稱「千人計劃」的共匪海外高層次人才引進計劃,被清華大學特聘為教授,自此開始在中美兩邊發展。

千人計劃」是共匪2008年開始實施的人才引進項目。根據該項目,中國將為重點創新項目、實驗室、央企等從海外引進逾2000名人才。

張首晟在2013年當選中國科學院外籍院士。同一年,他與學生谷安佳創立丹華資本。

該公司稱其專注於投資美國具有影響力的科技成果和商業創新,投資領域涵蓋人工智能、虛擬與增強現實、大數據、區塊鏈、企業級應用等具有顛覆性的新興技術。

2018年11月,美國貿易代表辦公室(USTR)更新版《301調查報告》,指共匪利用風險投資幫助共匪政權獲得美國的尖端技術和相關知識產權,其中就包括丹華資本。

公開資料顯示,張首晟1963年出生於上海,祖籍江蘇。他於1983年取得德國柏林自由大學物理學學士學位,後赴紐約州立大學修讀物理學博士,師從楊振寧。

2007年,張首晟預言並驗證量子自旋霍爾效應,被《科學》雜誌評為當年「全球十大重要科學突破」之一,他因此被湯森路透認為是最有可能獲得諾貝爾獎的科學家之一。

2010年,他獲得由歐洲物理學會頒發的歐洲物理獎。2012年,他獲得國際理論物理學領域最高獎「狄拉克獎」(Dirac Medal)。至此,他已經獲得過除諾貝爾獎之外幾乎所有的重要物理獎項。

2017年,他與華裔科學家王康隆、上海科技大學教授寇煦豐等團隊合作,在《科學》雜誌發表文章,證實馬約拉納費米子的存在,被命名為「天使粒子」。

https://www.bbc.com/zhongwen/trad/science-46464479

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發表於 2018-12-6 22:12:54 |顯示全部樓層
千人計劃將硏究天使粒子著名物理學張首晟推進抑鬱死亡

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5好抬舉哩D 叛國賊, 乜春丫,先5好猜度 佢 系米因為 利益/虛名 受 千人計劃 溝,就當佢系 真心 愛那國,佢5系土生 美國華裔,系入籍華裔,宣過誓,美國人 中國人 身份搞5清,so 於私 佢 系 叛美國,於公 偷渡高科比極權蟲國 系 害人類,黃皮膚利益 高於 5色人種,哩D 咁基要既原則搞5清,只算系 工匠而矣…

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發表於 2018-12-6 23:17:53 |顯示全部樓層
After Huawei arrest, experts say China could retaliate

The arrest and pending extradition of Huawei chief financial officer Wanzhou Meng for violating Iran sanctions may have quick, dramatic impacts in international politics and global technology sales.

Why it matters: The beleaguered Chinese electronics and telecommunications equipment firm is now facing geopolitical crises on two fronts: British BT just barred use of Huawei products in its 5G network. The arrest of Meng, the CFO and daughter of the company's founder, is a calamity on top of an already bad situation.

We may have cornered a wounded corporation.
"Huawei is one of the Chinese government's pet companies," said James Lewis, director of technology policy at the CSIS think tank and a former Commerce Department official who worked on Chinese high tech policy. "They will retaliate and China will take hostages."

"If I was an American tech executive, I wouldn't travel to China this week," Lewis added.


Background: Meng was arrested in Canada and will be extradited to the United States.

The U.S. has investigated Huawei for export violations since 2016.
Huawei denies all charges. In a statement, it wrote, "The company has been provided very little information regarding the charges and is not aware of any wrongdoing by Ms. Meng. The company believes the Canadian and U.S. legal systems will ultimately reach a just conclusion."
The charges echo similar charges against ZTE. Both Chinese companies manufacture tech equipment. ZTE has twice admitted to sending equipment to Iran and North Korea, ultimately settling for a $1 billion fine and organizational changes.

Huawei, like ZTE, is often accused by U.S. lawmakers of sabotaging its products to allow Chinese surveillance. Those allegations have led many nations, including the U.S., to bar the firms' equipment from use in telecommunications projects.

Ironically, Canada — which made the arrest — has not banned Huawei equipment.
Sen. Marco Rubio (R-Fla.) celebrated the arrest in an email to Axios and encouraged Canada to reverse course on permitting Huawei wares. "[Huawei] has long posed a serious risk to U.S. national security, and I continue to strongly urge Canada to reconsider Huawei’s inclusion in any aspect of its 5G development, introduction, and maintenance," he wrote.
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發表於 2018-12-6 23:27:05 |顯示全部樓層
正合奇 發表於 2018-12-6 23:17
After Huawei arrest, experts say China could retaliate

The arrest and pending extradition of Huawei ...

."They will retaliate and China will take hostages."

奇兄:
應該5會咁快既,arm arm 先跪到 90日 援刑,要 retaliate 都等埋 90日,否則 習跪跪 米變 習白跪,習跪跪 策略系 buy time 等 奇蹟,buy 到幾耐得幾耐,即刻 retaliate 米宣布 取銷 90日 援刑,希望 習冇學 Bencan 網友 咁 5忍得啦,要發作都等 90日 啦…
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發表於 2018-12-7 01:45:20 |顯示全部樓層
fangtao 發表於 2018-12-6 22:12
千人計劃將硏究天使粒子著名物理學家張首晟推進抑鬱死亡

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發表於 2018-12-7 02:49:09 |顯示全部樓層
RIP

夜半鐘聲,皓月當空。百年孤獨的求知旅程。 黎明既啟,征途既始,此時此刻,按書立志,賦詩為證:

既然無法抵擋她萬有的吸引,
為何不遨遊星際而時時相伴?
既然為量子因果而糾纏綿綿,
為何不心心相印寄在水一方?
既然追不上她永恆不變的步伐,
為何不對鏡賞花以光傳因緣?
既今見英魂長存於行行字跡,
又何懼漫漫征途中淵深峰險?


—— 張首晟

寫於2016年1月
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發表於 2018-12-7 04:19:18 |顯示全部樓層
jojo2016 發表於 2018-12-7 02:49
RIP

夜半鐘聲,皓月當空。百年孤獨的求知旅程。 黎明既啟,征途既始,此時此刻,按書立志,賦詩為證:

其實讀到physics 已經好勁,再成為quantum physics 專家更是難得,共匪真係全人類文明嘅煞星

JULY 20, 2017
An experiment proposed by Stanford theorists finds evidence for the Majorana fermion, a particle that’s its own antiparticle

In a discovery that concludes an 80-year quest, Stanford and University of California researchers found evidence of particles that are their own antiparticles. These Majorana fermions  could one day help make quantum computers more robust.

But in 1937, another brilliant physicist, Ettore Majorana, introduced a new twist: He predicted that in the class of particles known as fermions, which includes the proton, neutron, electron, neutrino and quark, there should be particles that are their own antiparticles.

Now a team including Stanford scientists says it has found the first firm evidence of such a Majorana fermion. It was discovered in a series of lab experiments on exotic materials at the University of California in collaboration with Stanford University. The experimental team was led by UCLA Professor Kang Wang, and precise theoretical predictions were made by Stanford Professor Shoucheng Zhang’s group, in collaboration with experimental groups led by Associate Professor Jing Xia at UC-Irvine and Professor Kai Liu at UC-Davis. The team reported the results July 20 in Science. (See video here.)

“Our team predicted exactly where to find the Majorana fermion and what to look for as its ‘smoking gun’ experimental signature,” said Zhang, a theoretical physicist and one of the senior authors of the research paper. “This discovery concludes one of the most intensive searches in fundamental physics, which spanned exactly 80 years.”

Although the search for the famous fermion seems more intellectual than practical, he added, it could have real-life implications for building robust quantum computers, although this is admittedly far in the future.

The particular type of Majorana fermion the research team observed is known as a “chiral” fermion because it moves along a one-dimensional path in just one direction. While the experiments that produced it were extremely difficult to conceive, set up and carry out, the signal they produced was clear and unambiguous, the researchers said.

“This research culminates a chase for many years to find chiral Majorana fermions. It will be a landmark in the field,” said Tom Devereaux, director of the Stanford Institute for Materials and Energy Sciences (SIMES) at SLAC National Accelerator Laboratory, where Zhang is a principal investigator.

“It does seem to be a really clean observation of something new,” said Frank Wilczek, a theoretical physicist and Nobel laureate at the Massachusetts Institute of Technology who was not involved in the study. “It’s not fundamentally surprising, because physicists have thought for a long time that Majorana fermions could arise out of the types of materials used in this experiment. But they put together several elements that had never been put together before, and engineering things so this new kind of quantum particle can be observed in a clean, robust way is a real milestone.”

Search for ‘quasiparticles’
Majorana’s prediction applied only to fermions that have no charge, like the neutron and neutrino. Scientists have since found an antiparticle for the neutron, but they have good reasons to believe that the neutrino could be its own antiparticle, and there are four experiments underway to find out – including EXO-200, the latest incarnation of the Enriched Xenon Observatory, in New Mexico. But these experiments are extraordinarily difficult and are not expected to produce an answer for about a decade.

About 10 years ago, scientists realized that Majorana fermions might also be created in experiments that explore the physics of materials – and the race was on to make that happen.

What they’ve been looking for are “quasiparticles” – particle-like excitations that arise out of the collective behavior of electrons in superconducting materials, which conduct electricity with 100 percent efficiency. The process that gives rise to these quasiparticles is akin to the way energy turns into short-lived “virtual” particles and back into energy again in the vacuum of space, according to Einstein’s famous equation E = mc2. While quasiparticles are not like the particles found in nature, they would nonetheless be considered real Majorana fermions.

Over the past five years, scientists have had some success with this approach, reporting that they had seen promising Majorana fermion signatures in experiments involving superconducting nanowires.

But in those cases the quasiparticles were “bound” – pinned to one particular place, rather than propagating in space and time – and it was hard to tell if other effects were contributing to the signals researchers saw, Zhang said.

A ‘smoking gun’
In the latest experiments at UCLA, UC-Davis and UC-Irvine, the team stacked thin films of two quantum materials – a superconductor and a magnetic topological insulator – and sent an electrical current through them, all inside a chilled vacuum chamber.

The top film was a superconductor. The bottom one was a topological insulator, which conducts current only along its surface or edges but not through its middle. Putting them together created a superconducting topological insulator, where electrons zip along two edges of the material’s surface without resistance, like cars on a superhighway.

It was Zhang’s idea to tweak the topological insulator by adding a small amount of magnetic material to it. This made the electrons flow one way along one edge of the surface and the opposite way along the opposite edge.

Then the researchers swept a magnet over the stack. This made the flow of electrons slow, stop and switch direction. These changes were not smooth, but took place in abrupt steps, like identical stairs in a staircase.

At certain points in this cycle, Majorana quasiparticles emerged, arising in pairs out of the superconducting layer and traveling along the edges of the topological insulator just as the electrons did. One member of each pair was deflected out of the path, allowing the researchers to easily measure the flow of the individual quasiparticles that kept forging ahead. Like the electrons, they slowed, stopped and changed direction – but in steps exactly half as high as the ones the electrons took.

These half-steps were the smoking gun evidence the researchers had been looking for.

The results of these experiments are not likely to have any effect on efforts to determine if the neutrino is its own antiparticle, said Stanford physics Professor Giorgio Gratta, who played a major role in designing and planning EXO-200.

“The quasiparticles they observed are essentially excitations in a material that behave like Majorana particles,” Gratta said. “But they are not elementary particles and they are made in a very artificial way in a very specially prepared material. It’s very unlikely that they occur out in the universe, although who are we to say? On the other hand, neutrinos are everywhere, and if they are found to be Majorana particles we would show that nature not only has made this kind of particles possible but, in fact, has literally filled the universe with them.”

He added, “Where it gets more interesting is that analogies in physics have proved very powerful. And even if they are very different beasts, different processes, maybe we can use one to understand the other. Maybe we will discover something that is interesting for us, too.”

Angel particle
Far in the future, Zhang said, Majorana fermions could be used to construct robust quantum computers that aren’t thrown off by environmental noise, which has been a big obstacle to their development. Since each Majorana is essentially half a subatomic particle, a single qubit of information could be stored in two widely separated Majorana fermions, decreasing the chance that something could perturb them both at once and make them lose the information they carry.

For now, he suggests a name for the chiral Majorana fermion his team discovered: the “angel particle,” in reference to the best-selling 2000 thriller Angels and Demons, in which a secret brotherhood plots to blow up the Vatican with a time bomb whose explosive power comes from matter-antimatter annihilation. Unlike in the book, he noted, in the quantum world of the Majorana fermion there are only angels – no demons.

The materials used for this study were produced at UCLA and UC Davis by a team led by postdoctoral researcher Qing Lin He and graduate student Lei Pan. Scientists from the KACST Center for Excellence in Green Nanotechnology in Saudia Arabia, UC-Davis, Florida State University, Fudan University in Shanghai and Shanghai Tech University also contributed to the experiment. Major funding came from the SHINES Center, an Energy Frontier Research Center at UC-Riverside funded by the U.S. Department of Energy Office of Science. Zhang’s work was funded by the DOE Office of Science through SIMES.

Media Contacts
Amy Adams, Stanford News Service: (650) 796-3695, amyadams@stanford.edu

https://news.stanford.edu/2017/07/20/evidence-particle-antiparticle/

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發表於 2018-12-7 04:22:26 |顯示全部樓層
利瓦仔 發表於 2018-12-7 04:19
其實讀到physics 已經好勁,再成為quantum physics 專家更是難得,共匪真係全人類文明嘅煞星

JULY 20, 2 ...

天使粒子  
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發表於 2018-12-7 08:10:32 |顯示全部樓層
利瓦仔 發表於 2018-12-7 04:19
其實讀到physics 已經好勁,再成為quantum physics 專家更是難得,共匪真係全人類文明嘅煞星

JULY 20, 2 ...

China's penetration of Silicon Valley creates risks for startups

SAN FRANCISCO (Reuters) - Danhua Capital has invested in some of Silicon Valley’s most promising startups in areas like drones, artificial intelligence and cyber security. The venture capital firm is based just outside Stanford University, the epicenter of U.S. technology entrepreneurship.

Yet it was also established and funded with help from the Chinese government. And it is not alone.

More than 20 Silicon Valley venture capital firms have close ties to a Chinese government fund or state-owned entity, according to interviews with venture capital sources and publicly available information.

While the U.S. government is taking an increasingly hard line against Chinese acquisitions of U.S. public companies, investments in startups, even by state-backed entities, have been largely untouched.

That may well be poised to change as the U.S. Congress finalizes legislation that dramatically expands the government’s power to block foreign investment in U.S. companies, including venture investments.

The new law would give the U.S. government’s Committee on Foreign Investment in the United States (CFIUS) wide latitude to decide what sorts of deals to examine, eliminating certain ownership thresholds, with a particular focus on so-called “critical” technologies.

“The perception is that a lot of the tech transfer of worry to the U.S. security establishment is happening in the startup world,” said Stephen Heifetz, a former member of CFIUS and now a lawyer representing companies going through CFIUS review.

The latest version of the bill exempts “passive” investors, which would cover many of the limited partners that back venture firms. But limited partners that have some control over the business, or firms whose managing partner is a “foreign person”, could be subject to scrutiny.

The university endowments and family offices that traditionally provide most of the money for venture firms are usually one of many limited partners and have minimal if any involvement in the startups they help fund.

Chinese entities also sometimes take a passive role in big venture funds. But venture capital sources say that Chinese government funds often play a more influential role in the smaller venture firms they back by providing a greater percentage of their funding. That empowers them to request information about startups or help them to open offices in China - potentially opening those startups to CFIUS review.

The possibility of a regulatory crackdown has caused unease in the startup world. Venture firm Andreessen Horowitz is counseling startups that if they raise money from a China-backed investor, they put themselves at risk of government scrutiny, a person with knowledge of the matter said.

“The window for some startups to raise money from China may be closing,” said Chris Nicholson, co-founder of AI company Skymind, which has raised money from Chinese Internet group Tencent Holdings Ltd and a Hong Kong family office.

SENSITIVE AREAS
Until recently, the original source of funds for venture investments has not been an issue in Silicon Valley. Venture firms are not obliged to disclose who their investors are and entrepreneurs rarely ask, leading some dealmakers to question how CFIUS could keep tabs on startup investing.

Danhua Capital, which is backed by the Zhongguancun Development Group, a state-owned enterprise funded by the Beijing municipal government, has holdings in some of the most sensitive technology sectors.

Its investments include data management and security company Cohesity, which counts the U.S. Department of Energy and U.S. Air Force among its customers. Drone startup Flirtey, which in May was selected by the U.S. Department of Transportation to participate in projects to help the agency integrate drones safely into U.S. air space, is also part of the Danhua portfolio.

Shoucheng Zhang, Danhua’s founder and a Stanford University physics professor, declined to answer specific questions from Reuters. In an email, he said: “Most of our (limited partners) are publicly listed companies in New York or Hong Kong stock exchanges. We will of course fully comply with any legislations and regulations.”

Cohesity declined to comment. A spokeswoman for Flirtey said Danhua’s minority investment did not come with any information rights or a board seat, and the firm is not involved in Flirtey’s operations.

“We would not knowingly accept money from the Chinese government; we take investment from Delaware-registered, Silicon Valley-based venture capital firms,” the spokeswoman said.

She added that Flirtey would support any new “mandate that investors must disclose if they have any form of backing from government entities, to help ensure there is never a question in the future.”

The practice of investing through layers of funds, known as funds of funds, can make it all but impossible to know where money is coming from. Westlake Ventures, backed by the Hangzhou city government in eastern China, invests in at least 10 other Silicon Valley venture funds, including Palo-Alto based Amino Capital.

Larry Li, founder and managing partner at Amino Capital, said he took the money that was on offer when he launched his fund in 2012. He said he felt his firm wasn’t the kind of known quantity that could tap the big pensions and endowments.

Waymo tests the business model of self-driving cars
“We weren’t going to the Harvard endowment or Yale endowment; that’s like mission impossible,” Li said. “You need to have some special source of funds to get started.”

China-backed funds include Oriza Ventures, which belongs to the investment arm of the Suzhou municipal government, and has backed AI and self-driving car startups. SAIC Capital, the venture arm of state-owned auto company SAIC Motor, has invested in Silicon Valley autonomous driving, mapping and artificial intelligence startups.

Even well-known startup accelerator 500 Startups raised part of its main fund from the Hangzhou government.

500 Startups and Oriza declined to comment, while SAIC did not respond to a request for comment.

Capital controls have slowed the flow of Chinese money into the United States since 2016, but sources say venture investments have been more resilient than sectors like real estate, in part due to the Chinese government’s focus on improving its domestic high-tech industry.

‘CROWN JEWELS’
U.S. politicians suspicious of China’s intentions were galvanized by a Department of Defense report released last year that warns that Chinese venture investors are accessing “the crown jewels of U.S. innovation.”

The report helped guide Sen. John Cornyn, a Texas Republican who sponsored the Senate version of the CFIUS reform bill, people with knowledge of the matter said. A spokeswoman said Cornyn “is especially concerned with Chinese state-backed venture capital investments.”

But the report was also panned by many private sector experts as overly simplistic and fear-mongering.

For now, at least, President Donald Trump has backed away from his declared intention to clamp down on a wide range of Chinese technology investments through a special emergency order, saying he would leave the job to CFIUS. But if Congress fails to pass the bill quickly, Trump said he would use his executive powers.

Reporting by Heather Somerville in San Francisco. Additional reporting by the Shanghai newsroom.; Editing by Jonathan Weber and Martin Howell.
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