07/05/2020
— Chinese archaeologists announced significant achievements at the Shuanghuaishu site in central China’s Henan Province, providing key proof of the origin of the over 5,000-year-long Chinese civilization.
— With an area of 1.17 million square meters, the Shuanghuaishu site, dating back to around 5,300 years, is located on the south bank of the Yellow River in the township of Heluo, Gongyi City, and was proposed to be named “Heluo kingdom.”
— A large number of relics of the Yangshao Culture dating back 5,000 to 7,000 years have been discovered at the site.
by Xinhua writers Xu Ruiqing, Wang Ding, Gui Juan, Shuang Rui
ZHENGZHOU, May 7 (Xinhua) — Chinese archaeologists announced Thursday significant achievements at the Shuanghuaishu site in central China’s Henan Province, providing key proof of the origin of the over 5,000-year-long Chinese civilization.
With an area of 1.17 million square meters, the Shuanghuaishu site is located on the south bank of the Yellow River in the township of Heluo, Gongyi City.
The ancient city relic dating back to around 5,300 years ago was proposed by Chinese archaeologists to be named “Heluo kingdom” after its location in the center of the Heluo area, where the Yellow River (known as He in ancient China) and the Luohe River meet.
“The Shuanghuaishu site is the highest-standard cluster with the nature of a capital city discovered so far in the Yellow River basin in the middle and late stage of Yangshao Culture, the early stage of the formation of Chinese civilization,” said Li Boqian, a professor at Peking University, at a press conference on major archaeological discoveries at Shuanghuaishu site held Thursday in Zhengzhou, the provincial capital.
Aerial photo taken on Aug. 27, 2019 shows the Shuanghuaishu site in central China’s Henan Province. (Xinhua/Li An)
A large number of relics of the Yangshao Culture dating back 5,000 to 7,000 years have been discovered at the site, said Gu Wanfa, director of the Zhengzhou Municipal Research Institute of Cultural Relics and Archaeology, at the press conference.
“The important archaeological findings provide key proof of the origin of Chinese civilization, and also prove the representativeness and influence of the Heluo area in the golden stage of the origin of Chinese civilization around 5,300 years ago,” said Wang Wei, a member of the Chinese Academy of Social Sciences.
Since 2013, the Zhengzhou Municipal Research Institute of Cultural Relics and Archaeology and the Institute of Archaeology of the Chinese Academy of Social Sciences have conducted continuous archaeological excavations on the site.
According to archaeologists, the Shuanghuaishu site was about 1,500 meters long from east to west and 780 meters wide from north to south. It was surrounded by three ring trenches with each found to have external access, forming a strict defense system.
Aerial photo taken on Aug. 27, 2019 shows the Shuanghuaishu site in central China’s Henan Province. (Xinhua/Li An)
The central residential area with four rows of houses was found in the northern part of the inner ring moat. Meanwhile, three public cemeteries with more than 1,700 tombs, three sacrificial remains, an astronomical relic, a pottery workshop area, a water storage area, a road system, and other facilities were also discovered at the city ruins.
“The Shuanghuaishu site was a well-selected and scientifically planned settlement site,” said Wang.
“Based on the geographical location and scale, it’s also the only large-scale city settlement discovered so far in the Yellow River basin from the middle and late stage of Yangshao Culture,” Wang added.
Archaeologists believe that the Heluo kingdom was the source of many typical characteristics of Chinese civilization.
Silk originated in China and later became one of the country’s major trade items. “The mulberry-growing and silkworm-raising culture was an important component of Chinese civilization,” said Li.
Among the unearthed relics at Shuanghuaishu, a boar tusk carving of a silkworm, 6.4 cm long, nearly 1 cm wide and 0.1 cm thick, was believed to be China’s earliest carving depicting silkworms.
Undated photo shows a boar tusk carving of a silkworm unearthed at the Shuanghuaishu site in central China’s Henan Province. (Xinhua)
Experts say that the carving depicts a spinning silkworm which is quite similar to modern silkworms in appearance. “The spinning shape of the carving suggests that ancient Chinese people were familiar with the habits of silkworms,” said Gu.
Along with silk fabrics unearthed at the surrounding Wanggou site and Qingtai site, archaeologists said they are solid evidence to prove that the ancient Chinese in the Yellow River basin began raising silkworms and silk production around 5,300 years ago.
“Except Shuanghuaishu and its surrounding settlement sites, there were no definite discoveries from around 5,300 years ago related to the silk textile industry in other parts of the country,” said Li. “In that sense, they are the earliest representatives in the development history of Chinese mulberry cultivation and silkworm-rearing culture.”
Meanwhile, at the astronomical relic at Shuanghuaishu, nine pottery pots were arranged in the pattern of the nine stars of the Big Dipper, which shows that the ancestors of Heluo had relatively mature astronomical knowledge.
Photo taken on April 28, 2020 shows one of nine pottery pots arranged in the pattern of the nine stars of the Big Dipper, at an astronomical relic at the Shuanghuaishu site in central China’s Henan Province. (Xinhua/Li An)
“The relic also indicates the worship of the celestial body may have formed a grand sacrificial ceremony for observing the solar terms and praying for a good harvest,” said Gu.
Experts also believe the astronomical relic and the surrounding sacrificial remains constitute a whole, which is consistent with the records of winter solstice sacrifices in ancient Chinese documents. “It is of great significance to the study of early Chinese astronomy and the origin of Chinese civilization,” added Gu.
Source: Xinhua
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12/03/2020
- In response to the 2008 global financial crisis, China pumped a 4 trillion yuan (US$575 billion) into its economy but it led to a mountain of local government debt
- Various early indicators suggest China’s economy will slow in the first quarter of 2020, with some suggestions it will suffer a first contraction since 1976
President Xi Jinping said China must accelerate construction of “new infrastructures such as 5G networks and data centres” on top of speeding up “key projects and major infrastructure construction” in response to the economic impact caused by the coronavirus outbreak. Photo: Xinhua
China should not try to bolster its coronavirus-hit economy by again resorting to a massive debt-fuelled fiscal and monetary stimulus programme, according to a group of government advisers.
Various early indicators suggest China’s economy will slow in the first quarter of 2020, with some even suggesting it will suffer a first contraction since the end of the Cultural Revolution in 1976.
This raises the question if China will miss its key 2020 growth target, with voices on both sides of the debate discussing what stimulus policies are needed to offset the deep impact of the coronavirus.
China is already leaning towards some additional stimulus, with Premier Li Keqiang ordering the central bank pump additional money into the banking system, while President Xi Jinping has announced the need for more spending on “new infrastructure”.
Are there other ways out for China except stimulus policies?Liu Shijin
“Are there other ways out for China except stimulus policies?” rhetorically asked Liu Shijin, who previously worked closely with Vice-Premier Liu He, the top economic aide to Xi, at the Development Research Centre, the think tank attached to the State Council.
“If it really works, why can’t Japan and the United States reach a 5 per cent growth rate?”
It is believed China will need to achieve an average 5.6 per cent growth in 2020 to achieve its goal of doubling the size of its economy from 2010, which is a key goal for
of creating a “comprehensively well-off” society.
China’s economy grew by
6.1 per cent in 2019, and while it was the slowest in 29 years, the US economy only grew 2.3 per cent, with Japan’s estimated to grow by 0.9 per cent.
What is gross domestic product (GDP)?
Liu Shijin, who is now a deputy head of the China Development Research Foundation and a policy adviser to the People’s Bank of China, argued that a growth rate averaging 5 per cent over the next decade is sufficient for China to meet its development goals.
Growth in 2020, though, may well be below 5 per cent given that the impact of the coronavirus is “unprecedented” and larger than both severe acute respiratory syndrome (Sars) in 2003 and the 2008 global financial crisis.
Xi said earlier this month that China must accelerate construction of “new infrastructures such as
5G networks and data centres” on top of speeding up “key projects and major infrastructure construction already included in state plans” like additional high-speed railway lines in response to the economic impact caused by the coronavirus outbreak.
But as this will mainly rely on corporate and private investment, Liu Shijin feels it will be too small to engineer a major rebound in the growth rate.
When encountering challenges, we should first push forward new reform measures to unleash growth potential. Now is the right timeLiu Shijin
“It’s a different thing compared to real [government-led] economic stabilisation,” Liu Shijin told a web seminar hosted by Peking University’s National School of Development on Wednesday.
“When encountering challenges, we should first push forward new reform measures to unleash growth potential. Now is the right time.”
Instead, to support longer-term growth, China should put its efforts into the development of its “city clusters”, which could lead to higher spending on housing construction, urban infrastructure and manufacturing, added Liu Shijin, which would increase the growth rate by up to an additional percentage point over the next decade.
China has so far refrained from the massive stimulus programme it adopted in 2008 in response to the global financial crisis, which included a 4 trillion yuan (US$575 billion) plan that pumped cheap money into government-backed projects but also created a mountain of local government debt.
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Zhang Bin, a senior researcher at the Chinese Academy of Social Sciences, said infrastructure construction will remain an important part of any plan to support growth.
“If the funding [for the 4 trillion yuan stimulus] had come solely from treasury bonds or local government bonds [rather than risky lending], there wouldn’t be so much shadow banking, unmanageable credit expansion, high leverage, implicit liabilities or financial risks,” he said.
“If the balance sheets of corporations, households and local governments can’t be repaired, it might lead to insufficient demand and a decline into a vicious [downward] cycle.”
Zhang, like Liu Shijin, is a key member of the China Finance 40 Forum, a group of state economists who advocate more structural reforms to support the Chinese economy. In particular, Zhang has set sights on reforms that would boost consumption, which accounted for 58 per cent of Chinese growth last year.
“The biggest weak link of the Chinese economy is that 200 to 300 million
migrant workers can’t [legally] settle in big cities,” he said. “Only if they are able to settle in the city that China can be called a real well-off society. It will also boost the economy, lift demand for manufactured goods and unleashed consumption potential.”
Currently, most large Chinese cities only provide social services including health care and schooling to residents who have a legal permit, or hukou. Most migrant workers who come to the big cities for jobs are blocked from obtaining a hukou, meaning they have to travel back to their rural hometowns to have access to basic social services, so often do not settle in their adopted city.
In response to this idea, Xu Yuan, a professor at Peking University, called for the government to build 10 million affordable housing units annually to accommodate new urban citizens, which would address short-term economic pain and serve the nation’s long-term development.
China will release its annual growth target as well as other key goals, including the fiscal deficit ratio and local bond quota, at the National People’s Congress, although the annual parliamentary convention, previously scheduled for March 5, has been postponed, with a new date yet to be announced.
Source: SCMP
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28/02/2020
- Tennessee academic Hu was arrested on Thursday and charged with three counts of wire fraud and three counts of making false statements
- The Justice Department said Hu hid his link to the Peking University while taking funding from the US space agency
Peking University in Beijing. Photo: Xinhua
US authorities on Thursday charged a professor at a university in Tennessee with fraud and false statements, saying he hid his link to a Chinese institution while taking funding from Nasa.
In the latest case related to US efforts to halt alleged unauthorised technology transfers to China, the Justice Department said Anming Hu hid his ties to Peking University of Technology while he taught and did research at University of Tennessee, Knoxville.
The indictment said that from 2016, Hu “engaged in a scheme to defraud the National Aeronautics and Space Administration” (Nasa) by hiding his affiliation with the Peking University.
“Federal law prohibits Nasa from using appropriated funds on projects in collaboration with China or Chinese universities,” the Justice Department said in a statement.
Hu was arrested on Thursday and charged with three counts of wire fraud and three counts of making false statements.
The wire fraud charges bring up to 20 years in prison and a fine of up to $250,000 each; the false statement counts each bring a maximum five years in prison.
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The case was brought by the national security division of the Justice Department, which has taken aim over the past year at a number of Chinese nationals for allegedly stealing industrial and other secrets to boost China’s economy and defence sectors.
“This is just the latest case involving professors or researchers concealing their affiliations with China from their American employers and the US government. We will not tolerate it,” said John Demers, the assistant attorney general for national security.
US charges Harvard chemistry chair with lying about China ties
Washington says Beijing both pressures and incentivises its nationals to bring back proprietary technology from the US.
Among those arrested for allegedly supporting Beijing’s illicit technology acquisition efforts is the chairman of Harvard University’s chemistry and chemical biology department.
Charles Lieber allegedly hid from Harvard and US authorities payments of $50,000 a month for his personal needs and $1.5 million in lab funding from a Chinese university.
Source: SCMP
Posted in academic, acquisition, Anming Hu, Beijing’s, charged, China, Harvard, hiding, illicit, NASA, National Aeronautics and Space Administration” (Nasa), Peking University, Technology, Tennessee, ties, Uncategorized, US professor, US space agency |
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27/12/2019
- The country’s second aircraft carrier, the Shandong, officially entered service this month, but bottlenecks in training could hamper the navy’s effectiveness
- Plans to build and launch more modern warships mean the need for fully trained pilots will only grow
A pilot based on the Liaoning is seen during a training exercise. China is facing a shortage of trained naval aviators. Photo: Handout
A shortage of naval pilots is holding back Beijing’s ambitions to develop a truly combat-ready fleet, military analysts have said.
China officially commissioned its second aircraft carrier the Shandong last week, which means it will need at least 70 pilots, along with more supporting flight officers.
However, plans to further expand its fleet to five or six carriers – as well as the more advanced technology that will be used on these vessels – mean the need to train more pilots will become more urgent in the future.
Chinese President Xi Jinping has initiated a sweeping modernisation drive across all branches of the People’s Liberation Army and said “the need to build up a strong navy has never been more pressing”.
The Shandong, China’s second carrier, officially entered service earlier this month. Photo: Handout
But Collin Koh, a research fellow at the S Rajaratnam School of International Studies at Singapore’s Nanyang Technological University, said there was a bottleneck in the recruitment and training of naval pilots.
“The implications of carrier-borne aviation are still relatively unfamiliar to the PLA, especially when there’s an urge to scale up training tempo and recruitment in order to fulfil the top directives of building a viable carrier programme,” he said.
China’s training programme for all military pilots is still developing – particularly when it comes to the naval aviation arm, which was only founded in May 2013.
China’s new carrier set to have smaller jet force than expected
China’s first aircraft carrier, the Liaoning, was commissioned in September 2012, but the first successful fighter landing on the ship did not happen until two months later.
The first successful night landing was not reported by state media until May 2018, almost four years later.
It appears to have taken even longer to fully train helicopter pilots, with the first successful day landing taking place in November 2018, according to China’s Naval Aviation University, and the first night landing in June this year.
The training programme has also been marred by a string of fatal accidents along the way, although Koh said these had been unreported to avoid deterring prospective recruits.
Days after China marked the 70th anniversary of the foundation of the People’s Republic with a huge military parade in Beijing on October 1, three airmen were killed when a transport helicopter crashed in central Henan province.
Just eight days later there was another crash on the Tibetan Plateau, where a J-10 fighter jet on a low-altitude flying drill crashed into a mountain. The pilot was reported to have survived.
“The attrition rate of carrier-borne pilot training, including those who might have been injured or killed in the line of duty, isn’t that well publicised by the PLA,” said Koh.
Fighters on the deck of the Liaoning, China’s first carrier. Photo: Xinhua
Li Jie, another Beijing-based military expert, said although the navy is short of pilots now, the problem could be solved within two to three years.
“The insufficient number of carrier-borne warplanes and the substantial training needed for a qualified naval pilot are the two main reasons why China is so short of pilots now. But as China places more and more emphasis on the education and training of the pilots, the problem will be gradually ironed out, ” said Li.
First made-in-China carrier officially enters service
The Naval Aviation University, which is responsible for the training of future naval pilots, has been working with three of the country’s leading universities – Peking, Tsinghua and Beihang – to identify and recruit future pilots.
The authorities have also set up Naval Aviation Experimental Classes in high schools across the country. Each class recruits 50 students, who enjoy a national subsidy and will be put in a priority list to be admitted as a naval pilot.
Source: SCMP
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27/10/2019
LANZHOU, Oct. 26 (Xinhua) — Dunhuang Academy China and Peking University have signed an agreement to establish a research center for Dunhuang studies, aiming to nurture more high-level research talent in the area.
Rong Xinjiang, a professor with Peking University, and Zhao Shengliang, the head of the Dunhuang Academy, will be the directors of the new center.
With a focus on the documents of Dunhuang and grottoes art, Dunhuang studies is an emerging interdisciplinary subject that covers areas such as history, geography, archeology and art.
The Dunhuang Academy, located in northwest China’s Gansu Province, administers the Mogao Grottoes, a renowned UNESCO World Heritage site that showcases the cultural integration and mutual learning among different civilizations along the ancient Silk Road.
The Mogao Grottoes are home to a priceless collection of Buddhist artwork — more than 2,000 colored sculptures and 45,000 square meters of murals — in 735 caves carved along a cliff by ancient worshippers.
Peking University is a pioneer of Dunhuang studies in China, with scholars of its predecessor beginning research in the area in the early 20th century.
Source: Xinhua
Posted in archeology, Art, Buddhist artwork, China alert, cultural integration, different civilizations, Dunhuang, Dunhuang Academy China, establishes, Gansu Province, geography, grottoes art, History, Lanzhou, Peking University, Research Center, studies, Uncategorized, unesco world heritage site |
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20/10/2019
A visitor views an exhibit at the Erlitou Relic Museum in Luoyang, central China’s Henan Province, Oct. 19, 2019. The Erlitou Relic Museum, which exhibits the history of ancient China’s first recorded dynasty of Xia (2070-1600 B.C.), opened Saturday in Luoyang. It exhibits over 2,000 items, including bronze wares, pottery wares and jade wares. Covering an area of 32,000 square meters, the museum exhibits the history of the Xia Dynasty, the first dynasty recorded in ancient China. Construction of the museum cost 630 million yuan (about 89 million U.S. dollars). The Erlitou Relics date back to 3,500 to 3,800 years ago in ancient China’s late Xia or early Shang (1600-1046 B.C.) dynasties. (Xinhua/Li An)
ZHENGZHOU, Oct. 19 (Xinhua) — The Erlitou Relic Museum opened Saturday in Luoyang city in central China’s Henan Province, unveiling the history and culture of ancient China’s first recorded dynasty of Xia (2070-1600 B.C.).
Covering an area of 32,000 square meters, the museum exhibits over 2,000 items, including bronze wares, pottery wares and jade wares.
Construction of the museum cost 630 million yuan (about 89 million U.S. dollars).
The Erlitou Relics date back to 3,500 to 3,800 years ago in ancient China’s late Xia or early Shang (1600-1046 B.C.) dynasties.
Discovered in 1959 in Luoyang by historian Xu Xusheng, Erlitou was identified by Chinese archaeologists as the relics of the capital city of the middle and late Xia Dynasty.
Over the past 60 years, archaeologists have excavated over 10,000 items out of a total area of 40,000 square meters from the site.
Zhao Haitao from the Chinese Academy of Social Sciences (CASS) Erlitou archaeological team, said that China’s earliest palace complex, bronze ware workshop and urban road network were all found at the site.
The museum has three display areas where visitors can experience and better understand the archaeological achievements of the Xia Dynasty, and probe into the history and culture of the Xia Dynasty via various kinds of projects, such as virtual reality, embossment and sand tables.
Li Boqian, a professor with the School of Archaeology and Museology of Peking University, said the Erlitou Relic Museum presents daily utensils, manufacturing tools and decorations for visitors to understand the social development, history and culture of the Xia Dynasty.
The museum will help people around the world learn about ancient Chinese history and culture, said Liu Yuzhu, director of China’s National Cultural Heritage Administration, at the opening ceremony.
In addition, the museum will become a demonstration site for the protection, preservation and exhibition of China’s major cultural heritage sites and a research center for the origin of Chinese civilization.
Source: Xinhua
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06/09/2019
- Researchers bend super-thin sheet using a single electrically charged atom in breakthrough that could eventually pave the way for powerful new computer processors
- Success follows decades of fruitless attempts by scientists around the world
The team from the Chinese Academy of Sciences conducted the “world’s smallest work of origami” with a sheet of graphene. Photo: Handout
Chinese scientists have taken the ancient art of origami to the atomic level by finding a way to fold microscopically small graphene, according to a new study.
The team managed to fold a 20 nanometre wide sheet of graphene into various shapes and forms using an extremely sharp needle with a single electrically charged atom at the tip, according to a paper published in the latest edition of Science magazine.
The breakthrough could eventually enable a host of technological advances, including the development of faster and more powerful computer processors, the researchers said.
“This is the world’s smallest origami work,” said Dr Du Shixuan, the study’s lead scientist, adding that the team hoped to build on their success by making the graphene equivalent of a paper aeroplane.
Unlike previous experiments, in which the folding occurred randomly or by accident, the new technology allows scientists to control the transformation with atomic-scale accuracy, according to Du, from the Institute of Physics at the Chinese Academy of Sciences in Beijing.
Microscopic images of the graphene folding process. Photo: Handout
Zhang Gengmin, a professor of physics at Peking University, said the team had managed something that other scientists had spent years trying to achieve.
Zhang, who was not involved in the study, said part of the difficulty was that atomic particles were influenced by quantum mechanics, a branch of physics whose laws are counter-intuitive to our daily experience.
In practice this means that folding a graphene sheet in one direction might cause it go in another direction or simply break apart.
Could these crystals be the next leap forward in China’s laser technology?
The new technology developed by Du’s team could have some critical applications, according to Zhang, who works at the university’s nano devices laboratory.
For instance, folding a sheet of graphene – formed from a single layer of latticed carbon atoms – into a “magic angle” will make it superconductive, a unique physical state that allows electrons to pass through without any resistance.
“It is a significant piece of work,” he said.
The 20 nanometre wide sheet was folded into various shapes. Photo: Handout
The paper by Du’s team withheld some of the technical details of their experiment, which means that other scientists may not be able to replicate the process simply by reading the paper.
Du defended the secrecy as a standard practice and necessary measure to maintain China’s lead in this field.
She said that the team’s success was down to many factors – including the hardware used, the strength of the electric current and the experience of the operator – and there were also lessons to be taken from their previous failed attempts.
The researchers said they hoped the technology would be used to improve the design and manufacturing of computer processors.
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At present, commercial processors are made using a large piece of silicon board known as a wafer.
But as the size of components such as transistors shrink, it has become increasingly difficult to improve the speed and performance of the computer due to the challenges of controlling the structure and properties of each component on a near-atomic scale
The new technology could give designers more freedom to develop a “dream chip” by building a central processing unit on an atom-by-atom basis from the bottom up.
But Du said the commercial application of the new technology could be years away.
Her team folded the graphene sheets manually, one at a time, but mass production would need the development of new manufacturing methods to do it automatically. At present “we are working on it”, Du added.
Source: SCMP
Posted in AI technology, Art, Atomic origami, Beijing, Chinese Academy of Sciences, Chinese scientists, folding graphene, graphene, Institute of Physics, master, new computer processors, Peking University, Science, submarines, superconductive, Uncategorized, uncharted waters, US scientists |
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05/09/2019
- New material is almost identical in structure to human enamel, which does not regenerate itself
- Crystal-like mineral can grow on teeth and last permanently, researchers say
Drops of the liquid solution are applied to a human tooth. Photo: Zhejiang University
Scientists at a Chinese university say they have discovered the world’s first material that can repair damaged tooth enamel once and last for life.
A few drops of the liquid solution can fix all invisible cracks and wear on an ageing molar, according to researchers at Zhejiang University in Hangzhou, eastern China, whose work was published on Friday in the journal Science Advances.
The material, calcium phosphate ion clusters, can grow a thin layer of protective shield on teeth, the research showed. The transparent, crystal-like mineral has a structure resembling fish scales and a high mechanical strength – almost identical to the enamel on a human tooth.
Its repair of the tooth “would be permanent”, wrote the researchers, led by Professor Tang Ruikang at the university’s chemistry department.
A tooth’s non-repaired left side (darker) and repaired right side (lighter) are compared using a fluorescent chemical. Photo: Zhejiang University
The technology could be developed as an effective remedy in clinical practice for enamel erosion, the main cause of tooth decay, Tang’s team said. Tooth decay affects almost half of the world’s population, costing dental patients in the United States and European Union a combined US$200 billion annually, according to the World Dental Federation.
Enamel, the outer covering of teeth, is the hardest tissue in the human body, protecting teeth during biting and chewing food.
Unlike other tissues such as muscle, bone and skin, enamel is generated by cells that die immediately after completing their job. The human body cannot produce more of them, so when enamel breaks or chips, it will not regenerate itself.
For decades, researchers around the world have conducted studies to seek a solution, but the artificial materials tested previously could not recreate precisely the fine structure of natural enamel, leaving gaps or holes that could cause it to break off real enamel.
Wouldn’t it be nice if our teeth fixed themselves, just like pandas’ do?
Tang’s team claim their new material can grow seamlessly on human teeth. They mixed two different types of repairing material together to form tiny clusters of mineral particles only 1.5 nanometres in diameter – smaller than a strand of human DNA.
Unlike in previous experiments, these clusters could remain stable for a long time without clumping together, making precise reconstruction of an enamel-like structure possible.
Chen Haifeng, associate professor at Peking University’s biomedical engineering department, said that the research was a positive step but that the new material might need improvements before clinical use.
For instance, the artificial layer requires two days to grow, which could be difficult for dentists to schedule with patients.
Many children use so much toothpaste it’s unhealthy, experts warn
The liquid solution contains triethylamine, a toxic substance with a very strong smell, which may pose a health risk, according to Chen. “But it doesn’t mean we can’t do anything,” he said.
The researchers said the chemical would quickly vaporise and none would be left in the teeth after the protective shield had formed.
Some products preventing enamel erosion and decay, such as toothpaste with enamel-strengthening ingredients, are already available in shops.
“Prevention is the best approach,” Chen said. “We should never wait until the damage is done. Our teeth are a miracle of nature. Artificial replacement will never do the job as well.”
Source: SCMP
Posted in ageing molar, almost, biomedical engineering department, bone, calcium phosphate ion clusters, chemistry department, Chinese scientists, Crystal-like mineral, dental patients, Enamel, European Union, first, fish scales, fix, grow, Hangzhou, human enamel, identical, invisible cracks, itself, last permanently, make, muscle, New material, pandas, Peking University, perfect replica, regenerate, researchers, Science Advances, skin, structure, teeth, tooth enamel, triethylamine, Uncategorized, United States, wear, World Dental Federation, Zhejiang University |
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05/09/2019
- Researchers will conduct tests at site in Gansu to see whether it will make a viable facility to store highly radioactive waste safely
- Scientists say China has the chance to become a world leader in this field but has to find a way to ensure it does not leak
A preliminary design for the Beishan Underground Research Laboratory. Photo: Handout
China has chosen a site for an underground laboratory to research the disposal of highly radioactive waste, the country’s nuclear safety watchdog said on Wednesday.
Officials said work will soon begin on building the Beishan Underground Research Laboratory 400 metres underground in the northwestern province of Gansu.
Liu Hua, the head of the Chinese National Nuclear Safety Administration, said work would be carried out to determine whether it would be possible to build a repository for high-level nuclear waste deep underground.
“China sees radioactive waste disposal as a very important part [of the development nuclear energy],” said Liu. “To develop nuclear energy, we must have safe storage and disposal of nuclear waste.”
China condemns US blacklisting of nuclear firms and says American companies could be hurt as a result
The Chinese authorities see nuclear power an important source of energy that will help to curb carbon emissions and pollution as well as reducing its dependence on fuel imports.
But while the country has made great strides in the development of nuclear power, it needs to find a safe and reliable way of dealing with its growing stockpiles of nuclear waste.
Liu said the Gansu site had been identified as a possible location for a deep nuclear waste store after years of searching.
Once the laboratory is built, scientists and engineers will start experiments to confirm whether it will make a viable underground storage facility.
“Based on the data of the experiments, we can then decide if we are going to pick this as the final site,” he added.
China ‘actively promoting’ nuclear fuel processing plant with French Areva
Chinese officials usually stay tight-lipped about how nuclear waste is disposed of mainly because of fears that any discussion of the topic would trigger safety fears, although in recent years more efforts have been made to inform the public to win support.
Scientists say that nuclear waste can be divided into three categories depending on the level of radioactivity.
Low-level waste consists of minimally radioactive materials such as mop heads, rags, or protective clothing used in nuclear plants, while intermediate-level waste covers things such as filters and used reactor components.
High-level waste, however, is generated by the reprocessing of spent nuclear fuel and scientists generally agree that the safest way to dispose of it is to bury it deep underground in areas where the geology means it will have a minimal impact on the environment while it decays over thousands of years.
The facility will be built in a remote part of Gansu province. Photo: Handout
Some Chinese scientists said the country had the chance to lead the world in this area of research but others have expressed concerns about safety.
Jiang Kejun, a senior researcher at the Energy Research Institute of China’s National Development and Reform Commission, said that very few countries in the world are studying this form of nuclear waste disposal.
“It gives China an opportunity to be a leader in research in this area, plus China has the technology and financial means,” he said.
About a dozen countries including France, Switzerland, Japan, and the United States have carried out research in this area, but in recent years most have abandoned or scaled back their programmes.
At present there are storage sites operating in Finland and the US, but other countries such as Germany have abandoned plans to build similar facilities.
Washington blacklists Chinese nuclear firms for ‘helping military acquire US technology’
But despite broad scientific support for underground disposal, some analysts and many members of the public remain sceptical about whether it is really safe.
Lei Yian, an associate professor at the School of Physics at Peking University, said there was no absolute guarantee that the repositories would be safe when they are come into operation.
“Leakage has happened in [repositories] in the US and the former Soviet Union … it’s a difficult problem worldwide,” he said. “If China can solve it, then it will have solved a global problem.”
China is also building more facilities to dispose of low and intermediate level waste. Officials said new plants were being built in Zhenjiang, Fujian and Shandong, three coastal provinces that currently lack disposal facilities.
At present, two disposal sites for low and intermediate-level waste are in operation in Gansu and Guangdong provinces.
Source: SCMP
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19/08/2019
- President says sale of Lockheed Martin F-16Vs will go ahead if ratified by Senate
- Military experts have said the jets would bolster Taiwan’s ability to counter the threat of air strikes from mainland China
A Taiwan Air Force F-16V takes off during a drill in May. Photo: EPA-EFE
Beijing warned it would take countermeasures against Washington for selling 66 fighter jets to Taiwan after US President Donald Trump said he had approved the US$8 billion deal.
Chinese foreign ministry spokesman Geng Shuang on Monday said the sale of Lockheed Martin F-16V jets was a serious violation of the one-China principle.
“China has made numerous solemn representations to the US on the sale of F-16V jets to Taiwan,” Geng said in a press conference, adding that the United States should halt the sale.
“The US has to bear all the consequences triggered by the sale,” Geng said. “China will take necessary measures to defend its self-interest based on the development of the situation.”
Geng gave no details of the action China would take. In July, Beijing said it would impose sanctions on US firms involved in a deal to sell US$2.2 billion worth of tanks, missiles and related equipment to Taiwan, describing it as harmful to China’s sovereignty and national security.
Liang Yunxiang, an international relations expert from Peking University, said one countermeasure Beijing might use was to suspend military-to-military exchanges with the United States.
Speaking to reporters in New Jersey on Sunday, Trump said that the sale would need to be ratified by the US Senate but that he had approved it.
“It’s US$8 billion. It’s a lot of money. That’s a lot of jobs. And we know they’re going to use these F-16s responsibly,” he said.
If the deal is approved by Congress, it will be the first time since 1992 that the United States has sold F-16s to Taiwan. Previous requests were rejected by the Barack Obama administration, which instead offered to upgrade Taiwan’s existing fleet of about 140 F-16A/B Block 20 aircraft.
During months of slow progress since
the sale was outlined earlier this year, some lawmakers and defence experts had suggested that Trump was using the proposed deal as leverage to secure a better agreement for the US in talks to resolve its year-long
Taiwan’s presidential office and foreign ministry lauded Trump’s announcement, calling it a strong sign of the US’ commitment to its security and saying the deal would help to maintain regional stability.
“The new warplanes will greatly strengthen our anti-air defence capability and we will continue to be devoted to safeguarding peace and stability across the Taiwan Strait and in the region, thereby maintaining freedom and democracy in Taiwan,” presidential office spokesman Alex Huang said.
‘Fighter jets trump battle tanks’ in Taiwan’s US arms priorities
In a statement, Taiwan’s foreign ministry said persistent war games by the mainland around the island and in the East and South China Sea had not only sabotaged peace and stability in the region but also triggered grave concern from China’s neighbours.
It described Trump’s approval of the deal as a “strong indicator of the close and growing security partnership between the US and Taiwan”.
Opinion: Care needed over Taiwan arms deal
Military experts have said the new variant of the F-16, the Viper – which can carry a wide range of short and medium-range air-to-air missiles – is more able to counter the threat of an air strike from mainland China’s fourth-generation aircraft, such as the Su-35 and J-10.
Last week, Republican Senator Marco Rubio said the US administration had made progress in advancing the deal, which he called “an important step in support of Taiwan’s self-defence efforts”.
In July, the US also approved arms sales to Taiwan worth US$2.2 billion, including 108 M1A2T Abrams tanks and 250 Stinger portable surface-to-air missiles.
Beijing strongly opposes arms deals with Taiwan, which it considers a renegade province, but the US is obliged to help defend the self-governing island under the terms of its Taiwan Relations Act, effective since 1979.
Source: SCMP
Posted in Abrams tanks, air strikes, approves, Barack Obama administration, Beijing, China’s sovereignty, chinese foreign ministry spokesman, Congress, consequences, countermeasures, fighter jets, Foreign Ministry, foreign ministry spokesman, international relations expert, Lockheed Martin F-16Vs, Mainland China, Military experts, National security, one-China principle, Peking University, President Donald Trump, renegade province, sale, Senate, Stinger portable surface-to-air missiles, Taiwan, Taiwan Relations Act, Taiwan Strait, Uncategorized, US, war games, warns, warplanes, Washington |
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