At the invitation of Union Youth Federation of Cambodia and the International Department of the Lao People’s Revolutionary Party’s Central Committee,a Chinese NGO Delegation headed by Mr.Ni Jian,Secretary-General of...At the invitation of Union Youth Federation of Cambodia and the International Department of the Lao People’s Revolutionary Party’s Central Committee,a Chinese NGO Delegation headed by Mr.Ni Jian,Secretary-General of the Chinese Association for International Understanding paid visit to Cambodia and Laos from October 21 to 28.As a member of the delegation,I set my feet on展开更多
Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although...Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although the intelligent reflecting surface(IRS)can be adopted to create effective virtual links to address the mmWave blockage problem,the conventional solutions only adopt IRS in the downlink from the Base Station(BS)to the users to enhance the received signal strength.In practice,the reflection of IRS is also applicable to the uplink to improve the spectral efficiency.It is a challenging to jointly optimize IRS beamforming and system resource allocation for wireless energy acquisition and information transmission.In this paper,we first design a Low-Energy Adaptive Clustering Hierarchy(LEACH)clustering protocol for clustering and data collection.Then,the problem of maximizing the minimum system spectral efficiency is constructed by jointly optimizing the transmit power of sensor devices,the uplink and downlink transmission times,the active beamforming at the BS,and the IRS dynamic beamforming.To solve this non-convex optimization problem,we propose an alternating optimization(AO)-based joint solution algorithm.Simulation results show that the use of IRS dynamic beamforming can significantly improve the spectral efficiency of the system,and ensure the reliability of equipment communication and the sustainability of energy supply under NLOS link.展开更多
The year 2023 witnessed frequent conflicts in South Asia, Africa, and the Middle East, fueling the existing security crises and paving the way for the expansion of international terrorism. The United States(US) is now...The year 2023 witnessed frequent conflicts in South Asia, Africa, and the Middle East, fueling the existing security crises and paving the way for the expansion of international terrorism. The United States(US) is now pursuing a “counterterrorism light” strategy, reducing investments in the fight against terrorism, and focusing on so-called great power competition. In such a context, security turbulence has severely affected counterterrorism in many world regions, pushing international counterterrorism efforts into a tight corner.展开更多
Since the launch in 1950,Science China Series and Science Bulletin have published numerous significant scientific achievements,witnessing the development of science and technology in China and serving as a bridge conn...Since the launch in 1950,Science China Series and Science Bulletin have published numerous significant scientific achievements,witnessing the development of science and technology in China and serving as a bridge connecting Chinese scientists with their counterparts in the international scientific community.展开更多
China textile and apparel exports to Japan was witnessing a downturn in all statistics of China Customs and Japan METI in the Jan.-Apr. 2010 period. Exports to Japan this year later will face more pressure as gains in...China textile and apparel exports to Japan was witnessing a downturn in all statistics of China Customs and Japan METI in the Jan.-Apr. 2010 period. Exports to Japan this year later will face more pressure as gains in Japan’s consumption could moderate due to a lackluster jobs market and debt crisis.展开更多
The recent years have witnessed the exit of many foreign cosmetic brands from the Chinese market,such as Revlon and e.l.f.Since 2021,about 20 foreign cosmetic brands have withdrawn from the Chinese market,where they c...The recent years have witnessed the exit of many foreign cosmetic brands from the Chinese market,such as Revlon and e.l.f.Since 2021,about 20 foreign cosmetic brands have withdrawn from the Chinese market,where they cannot escape the doom of failure.展开更多
According to the recently issued 2022 China Game Industry Report,the actual sales revenue of China’s game market in 2022 reached RMB 265.884billion,down by 10.33% year on year.The number of game users was 664 million...According to the recently issued 2022 China Game Industry Report,the actual sales revenue of China’s game market in 2022 reached RMB 265.884billion,down by 10.33% year on year.The number of game users was 664 million,down by 0.33% year on year.After the evident slowdown of market growth in2021,the year 2022 witnessed the first decline in the past eight years,and the game industry has entered the phase of focusing on stock market.As the blue ocean of the market shrinks and the market competition becomes increasingly fierce,the significance of "going overseas" will be more and more important for the game industry.展开更多
1 Art Market Issue 9,2023,China inthe Archives,The rise and fall of classical books have witnessed the hard course of civilization inheritance.As a national cultural palace in the new era,the China National Archives o...1 Art Market Issue 9,2023,China inthe Archives,The rise and fall of classical books have witnessed the hard course of civilization inheritance.As a national cultural palace in the new era,the China National Archives of Publications and Culture not only collects versions in the form of objects and paper.展开更多
China’s national gallery has witnessed and contributed to the development of Chinese culture and fine arts since its opening,and served as an active advocate for exchanges among civilizations.
The first China-Arab States Summit ushered in a new era for the relationship between China and the Arab world.CHINA and the Arab world,though geographically far apart,have enjoyed friendship that goes back millennia.T...The first China-Arab States Summit ushered in a new era for the relationship between China and the Arab world.CHINA and the Arab world,though geographically far apart,have enjoyed friendship that goes back millennia.The Silk Road and the maritime Spice Route have witnessed the two ancient civilizations learn from each other and inspire each other,jointly promoting the prosperity of human society.In modern times.展开更多
文摘At the invitation of Union Youth Federation of Cambodia and the International Department of the Lao People’s Revolutionary Party’s Central Committee,a Chinese NGO Delegation headed by Mr.Ni Jian,Secretary-General of the Chinese Association for International Understanding paid visit to Cambodia and Laos from October 21 to 28.As a member of the delegation,I set my feet on
基金supported by the National Natural Science Foundation of China 62001051.
文摘Wireless Power Transfer(WPT)technology can provide real-time power for many terminal devices in Internet of Things(IoT)through millimeterWave(mmWave)to support applications with large capacity and low latency.Although the intelligent reflecting surface(IRS)can be adopted to create effective virtual links to address the mmWave blockage problem,the conventional solutions only adopt IRS in the downlink from the Base Station(BS)to the users to enhance the received signal strength.In practice,the reflection of IRS is also applicable to the uplink to improve the spectral efficiency.It is a challenging to jointly optimize IRS beamforming and system resource allocation for wireless energy acquisition and information transmission.In this paper,we first design a Low-Energy Adaptive Clustering Hierarchy(LEACH)clustering protocol for clustering and data collection.Then,the problem of maximizing the minimum system spectral efficiency is constructed by jointly optimizing the transmit power of sensor devices,the uplink and downlink transmission times,the active beamforming at the BS,and the IRS dynamic beamforming.To solve this non-convex optimization problem,we propose an alternating optimization(AO)-based joint solution algorithm.Simulation results show that the use of IRS dynamic beamforming can significantly improve the spectral efficiency of the system,and ensure the reliability of equipment communication and the sustainability of energy supply under NLOS link.
文摘The year 2023 witnessed frequent conflicts in South Asia, Africa, and the Middle East, fueling the existing security crises and paving the way for the expansion of international terrorism. The United States(US) is now pursuing a “counterterrorism light” strategy, reducing investments in the fight against terrorism, and focusing on so-called great power competition. In such a context, security turbulence has severely affected counterterrorism in many world regions, pushing international counterterrorism efforts into a tight corner.
文摘Since the launch in 1950,Science China Series and Science Bulletin have published numerous significant scientific achievements,witnessing the development of science and technology in China and serving as a bridge connecting Chinese scientists with their counterparts in the international scientific community.
文摘China textile and apparel exports to Japan was witnessing a downturn in all statistics of China Customs and Japan METI in the Jan.-Apr. 2010 period. Exports to Japan this year later will face more pressure as gains in Japan’s consumption could moderate due to a lackluster jobs market and debt crisis.
文摘The recent years have witnessed the exit of many foreign cosmetic brands from the Chinese market,such as Revlon and e.l.f.Since 2021,about 20 foreign cosmetic brands have withdrawn from the Chinese market,where they cannot escape the doom of failure.
文摘According to the recently issued 2022 China Game Industry Report,the actual sales revenue of China’s game market in 2022 reached RMB 265.884billion,down by 10.33% year on year.The number of game users was 664 million,down by 0.33% year on year.After the evident slowdown of market growth in2021,the year 2022 witnessed the first decline in the past eight years,and the game industry has entered the phase of focusing on stock market.As the blue ocean of the market shrinks and the market competition becomes increasingly fierce,the significance of "going overseas" will be more and more important for the game industry.
文摘1 Art Market Issue 9,2023,China inthe Archives,The rise and fall of classical books have witnessed the hard course of civilization inheritance.As a national cultural palace in the new era,the China National Archives of Publications and Culture not only collects versions in the form of objects and paper.
文摘China’s national gallery has witnessed and contributed to the development of Chinese culture and fine arts since its opening,and served as an active advocate for exchanges among civilizations.
文摘The first China-Arab States Summit ushered in a new era for the relationship between China and the Arab world.CHINA and the Arab world,though geographically far apart,have enjoyed friendship that goes back millennia.The Silk Road and the maritime Spice Route have witnessed the two ancient civilizations learn from each other and inspire each other,jointly promoting the prosperity of human society.In modern times.
