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China Space Station: Homegrown solar array powers nation’s space ambition

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As China’s first lab module Wentian, belonging to its space station – also the largest and heaviest spacecraft – has been sent to the space, the solar wings installed on it has also grabbed attention since it’s the largest flexible solar array the country ever used for a spacecraft.

The wingspan of the pair of solar panels on the Wentian lab module can reach over 55 meters long. Each solar wing spreads to 110 square meters when fully unfolded – almost as large as a decent sized apartment with a living room and three bedrooms. The total area of the solar array will reach as large as 400 square meters when three main modules including the core module and the two lab modules are assembled.

Wentian’s solar wing is two times larger than that of the core module Tianhe. Only four of such solar wings can generate 80 percent of the power for the combination of the core module and two lab modules.

There are wrist-like units designed to help rotate Wentian’s two 27-meter-long wings by 360 degrees to face the sunlight in unblocked positions.

There are a slew of dark-color glass-like pieces aligned on the solar wings, forming a solar array which can achieve a high power conversion efficiency of 30 percent. Traditional solar panels only convert 15-22 percent of the sun’s energy into electricity.

The power supply capacity of the batteries supported by the solar wings can generate an average of over 430 kilowatt electricity daily – enough for the consumption of an ordinary household for one and a half months.

The solar wings are installed at the tail of the Wentian module to avoid being blocked by each other at certain angles from the sun and to maximize the power generation efficiency .

The flexible solar wings are used for lighter weight and higher power compared to traditional rigid solar wings.

Flexible solar wing technology

It is not the first time that China has adopted flexible solar wings as an energy source for a spacecraft. In fact, the flexible solar wings were first used on the core module Tianhe with each wing measuring 67 square meters.

The application of solar wings for China’s space projects has witnessed the country’s ceaseless advance in solar array technology.

It developed its first generation rigid solar array technology for the Shenzhou manned spaceship project. Then the second generation of semi-rigid solar array technology was adopted for the Tianzhou cargo spacecraft.

The flexible solar array technology is the third generation technology which has been used on all the modules of the space station.

The estimated electricity consumption for three taikonauts living and working in the space station for one day is roughly 320 kilowatt. The traditional rigid or semi-rigid solar wings failed to meet the demand due to the limitation of its size, weight and power. That’s where the flexible solar wings came in.

Compared with the traditional rigid and semi-rigid solar cell wings, the flexible wings are small in size, large in deployment area, and high in power-to-weight ratio.

The flexible wing is only one book thick after being folded, which is only 1/15 of the rigid solar wing. During the launch, the flexible solar wings were first folded tightly like a closed accordion. Each panel is less than one millimeter thick, thus reducing the volume of the folded arrays to just 20 percent the volume of traditional solar panels.

It is made of ultra-thin lightweight composite materials, and the coating thickness of the glue layer used to protect the space environment is also strictly controlled.

Source: psmnews

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UN adopts first global artificial intelligence resolution to ensure AI is safe

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The United Nations General Assembly unanimously adopted the first global resolution on artificial intelligence on Thursday, encouraging countries to safeguard human rights, protect personal data, and monitor AI for risks.

The nonbinding resolution, proposed by the United States and co-sponsored by China along with over 120 other nations, also advocates for the strengthening of privacy policies.

“Today, all 193 members of the United Nations General Assembly have spoken in one voice, and together, chosen to govern artificial intelligence rather than let it govern us,” U.S. Ambassador to the United Nations Linda Thomas-Greenfield said.

The resolution is the latest in a series of initiatives – few of which carry significant enforceability – by governments around the world to shape AI’s development amid fears it could disrupt democratic processes, turbocharge fraud, or lead to dramatic job losses, among other harms.

“The improper or malicious design, development, deployment and use of artificial intelligence systems … pose risks that could … undercut the protection, promotion and enjoyment of human rights and fundamental freedoms,” the measure states.

In November, the U.S., Britain and more than a dozen other countries unveiled the first detailed international agreement on how to keep artificial intelligence safe from rogue actors, pushing for companies to create AI systems that are “secure by design.”

Europe is ahead of the United States, with EU lawmakers adopting a provisional agreement this month to oversee the technology. The Biden administration has been pressing lawmakers for AI regulation, but a polarized U.S. Congress has made little headway. In the meantime, the White House sought to reduce AI risks to consumers, workers, and minorities while also bolstering national security with a new executive order in October.

The resolution aims to close the digital divide between rich developed countries and poorer developing countries to ensure that all are included in discussions on AI. It also aims to ensure that developing countries have the technology and capabilities to take advantage of AI’s benefits, including detecting diseases, predicting floods, helping farmers, and training the next generation of workers.

The resolution recognizes the rapid acceleration of AI development and use and stresses “the urgency of achieving global consensus on safe, secure and trustworthy artificial intelligence systems.”

It also acknowledges that “the governance of artificial intelligence systems is an evolving area” that requires further discussions on possible governance approaches and emphasizes that innovation and regulation are mutually reinforcing – not mutually exclusive.

Source(s): CGTN

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Beijing still tops Nature Index global science city rankings

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Beijing has consistently ranked first in the global science city rankings for eight consecutive years, as measured by the Nature Index, according to Yin Yong, deputy secretary of the Communist Party of China (CPC) Beijing Municipal Committee and mayor of Beijing.

Nature Index tracks the authorship of articles in prestigious research journals and Beijing’s ranking has shown that the city remains the top science city in the world.

On Tuesday, China’s State Council Information Office held a press conference on leveraging Beijing’s strategic role as the national capital, initiating a new chapter in high-quality development. Yin made the remarks while he answered questions from the media at the press conference.

Yin also introduced the capital’s achievement in seeking scientific and technological innovation and attracting high-level talent in science and technology.

Beijing has 92 colleges and universities, and more than 1,000 research institutes and its numbers of national laboratories and large scientific installations are ranked first in the country.

Beijing’s investment in research and development has also been among the largest in the country. Every 10,000 people in Beijing hold an average of over 262 invention patents, ranking first in China.

The capital has a large talent pool with more than 550,000 scientific researchers. In the field of artificial intelligence, for instance, Beijing’s top talent accounts for about 43 percent of the country’s total.

An average of 337 technology-based enterprises are established in Beijing every day, and the number of national high-tech enterprises and unicorn enterprises rank first among all cities in the country.

Source(s): CGTN

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Newly operated Hydro-floating solar project showcases China-Thailand cooperation in clean energy

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KHON KAEN, Thailand, March 5 (Xinhua) — A hydro-floating solar project jointly built by Chinese and Thai companies started commercial operation on Tuesday to support Thailand’s development of clean energy.

The Ubolratana Dam hydro-floating solar hybrid power plant, located in Thailand’s northeastern Khon Kaen province, integrates floating solar panels, clean hydropower, high-efficiency energy storage systems, and smart energy management systems, according to Dongfang Electric International Corporation, one of the world’s largest manufacturers of power-generating equipment that built the project with its Thai partner.

Jiraporn Sirikum, deputy governor of the Electricity Generating Authority of Thailand (EGAT), said building floating solar hybrid power plants is an important step toward the clean energy production and power stability of Thailand, praising the Chinese and the Thai companies for being able to deliver the project ahead of schedule.

“This showed a serious commitment to promoting clean energy in Thailand. We sincerely hope that the floating solar will help to promote clean energy for the community economy and local society,” Jiraporn told a commercial operation launching ceremony.

Liu Hongmei, Chinese Consul General in Khon Kaen, said she believed that the project’s commercial operation would bring greater well-being to the people of Northeast Thailand and mark a new milestone for Chinese enterprise investment in the region.

The Ubolratana Dam hydro-floating solar hybrid power plant is its second such hydro-floating solar project, said EGAT, which aims to build more such projects nationwide to promote clean energy.

Source(s): Xinhua

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