From January to February,policies and measures to stabilize the economy were further effective,combined with factors such as the fading impact of the pandemic,and the resumption of production and business in China'...From January to February,policies and measures to stabilize the economy were further effective,combined with factors such as the fading impact of the pandemic,and the resumption of production and business in China's garment industry accelerated steadily.The domestic garment market changed from a decline to an increase,and the market vitality continued to recover.However,due to the weakening of international market demand,order transfer and other reasons,China's garment exports are from positive growth to a significant decline In general,with domestic sales recovering and exports declining,the growth rate of major indicators such as production,benefit and investment of the garment industry showed an obvious negative growth trend.There are still great pressures and challenges for the industry to maintain a stable recovery.展开更多
China International Publishing Group(CIPG)served as one of the first windows for the outside world to get to know China.Its predecessor,the International News Division of the National Press Administration of the Centr...China International Publishing Group(CIPG)served as one of the first windows for the outside world to get to know China.Its predecessor,the International News Division of the National Press Administration of the Central Government,was founded the same day as the People’s Republic of China(PRC)on October 1,1949.Qiao Guanhua,who later became Minister of Foreign Affairs,first headed the division.New China’s foreign language publishing and distribution efforts began as quickly as anything else.展开更多
Located in the southern part of Tianjin,a municipality neighboring Beijing,Nankai University was founded in August 1919.Over the past 100 years,the university has been a mosaic of China’s history.At the time of its b...Located in the southern part of Tianjin,a municipality neighboring Beijing,Nankai University was founded in August 1919.Over the past 100 years,the university has been a mosaic of China’s history.At the time of its birth,China was struggling under the rule of warlords who were battling for dominance after the fall of the Qing Dynasty(1644-1911),the last imperial dynasty of the country,and was in a fragmented state.Zhang Boling and Yan Xiu,two patriotic educators from Tianjin,had learned about modern educational systems abroad and decided to establish a modern system in their hometown to practice the philosophy of Saving the Nation Through Education.They started with Nankai Middle School in 1912.展开更多
Success of the revolution represents but only the first step in a long march. ---Mao Zedong Mao Zedong’s announcement in 1949 that "the Chinese people have stoodup," ended the dark decades of domestic fragm...Success of the revolution represents but only the first step in a long march. ---Mao Zedong Mao Zedong’s announcement in 1949 that "the Chinese people have stoodup," ended the dark decades of domestic fragmentation and foreign subjugation,展开更多
The Ningdong Energy and Chemical Industry Base in northwest China's Ningxia Hui Autonomous Region,one of China's major energy production bases,is eyeing opportunities in hydrogen energy production.In contrast ...The Ningdong Energy and Chemical Industry Base in northwest China's Ningxia Hui Autonomous Region,one of China's major energy production bases,is eyeing opportunities in hydrogen energy production.In contrast to grey hydrogen,which is produced from natural gas,green hydrogen,which is made from water and renewable power,has been considered a more climate-friendly energy solution.Producing green hydrogen is critical for the mega coal-to-chemical industry base to move towards modem.展开更多
Lao Zhang was a retired construction worker in Hohhot, capital of north China＇s Inner Mongolian Autonomous Region. The old man had worked to build apartment buildings all his life but never expected, even in a dream,...Lao Zhang was a retired construction worker in Hohhot, capital of north China＇s Inner Mongolian Autonomous Region. The old man had worked to build apartment buildings all his life but never expected, even in a dream, to be able to set his home in one of them.展开更多
On entering the mountainous vii lage of Yanbo in southwest China＇s Guizhou Province. the first thing noticeable is the flat roads and rows of new houses with cars parked in front of them. Against the hillside behind ...On entering the mountainous vii lage of Yanbo in southwest China＇s Guizhou Province. the first thing noticeable is the flat roads and rows of new houses with cars parked in front of them. Against the hillside behind ihe houses are several bustling village run enterprises, including a distillery and poultry farms.展开更多
Any organization that makes it to its 50th anniversary must have been doing something right. The African Union （AU） reached this milestone in May and can look back on the past half century as one in which Africa bec...Any organization that makes it to its 50th anniversary must have been doing something right. The African Union （AU） reached this milestone in May and can look back on the past half century as one in which Africa became independent and experienced positive gains in political and economic cooperation across the continent.展开更多
E Ink's microcapsules are filled with a clear liquid that holds very small particles.Some particles are black.Some are white.All of the particles have an e- lectrical charge.To make a sheet of electronic paper, en...E Ink's microcapsules are filled with a clear liquid that holds very small particles.Some particles are black.Some are white.All of the particles have an e- lectrical charge.To make a sheet of electronic paper, engineers spread millions of the particle-filled micro- capsules onto a piece of plastic.展开更多
A physical education class got underway at a resort in Urumqi,Xinjiang Uygur Autonomous Region,on December 19,2023.During the off-campus lesson,students from Miaoergou Middle School went sking,supervised by instructor...A physical education class got underway at a resort in Urumqi,Xinjiang Uygur Autonomous Region,on December 19,2023.During the off-campus lesson,students from Miaoergou Middle School went sking,supervised by instructors working at the Silk Road Mountain Resort,a well-equipped sking destination.展开更多
Zhao Zhonghui,a Chinese-English translator,passed the China Accreditation Test for Translators and Interpreters(CATTI)Level 1,the highest level,in 2013.Zhao is now director of the translation center of MCC BERIS Engin...Zhao Zhonghui,a Chinese-English translator,passed the China Accreditation Test for Translators and Interpreters(CATTI)Level 1,the highest level,in 2013.Zhao is now director of the translation center of MCC BERIS Engineering and Research Corp.,a subsidiary of state-owned China Metallurgical Group Corp.,based in Qingdao,Shandong Province.展开更多
Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the stripper.In the high-energy mode of t...Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the stripper.In the high-energy mode of the booster ring(BRing)of the high-intensity heavy-ion accelerator facility,the pre-accelerated ions from the iLinac will be stripped by a carbon foil to higher charge states and then injected into the BRing.The key parameters of the stripper and stripped ions were calculated,and the influence of stripping on the beam quality was discussed.To get high stripping efficiencies,the foil thicknesses and resultant charge state distributions for the typical ions were determined by the code ETACHA.The equilibrium thickness was obtained for the U beam,while the stripper thicknesses for the Xe and Kr beams were determined based on a compromise between the stripped charge states and the stripping efficiency.The energy loss,energy straggling,and emittance growth due to stripping have a non-negligible impact on the transport of the stripped beams and the injection of the ring.Therefore,these parameters were simulated by GEANT4.In addition,the foil’s temperature evolution,which greatly affects the foil lifetime,was simulated by ANSYS.The maximum temperature of the foil bombarded by the U and Xe beams with the nominal parameters will exceed the safe value in terms of the impact of evaporation on the foil’s lifetime.Given the foil temperature constraint,the highest tolerable beam intensity and the injected ion number into the ring were derived for different beam sizes.The results of this paper will present important reference data for the optimization design and commissioning of the beamline and injection to the BRing for the stripped ions.展开更多
In a secluded corner of a café,several young people sit around a small square table laden with an assortment of drinks and desserts.They take turns introducing themselves.The setup is reminiscent of speed dating ...In a secluded corner of a café,several young people sit around a small square table laden with an assortment of drinks and desserts.They take turns introducing themselves.The setup is reminiscent of speed dating or a team-building meeting,but the content of discussion is far from either.The unique event is known as Death Café.The purpose of the gathering is to discuss issues related to death.Participants express their thoughts,share experiences and rarely exposed emotions,and offer mutual support amidst a whirlwind of intense feelings.展开更多
To solve the problem of long response time when users obtain suitable cutting parameters through the Internet based platform,a case-based reasoning framework is proposed.Specifically,a Hamming distance and Euclidean d...To solve the problem of long response time when users obtain suitable cutting parameters through the Internet based platform,a case-based reasoning framework is proposed.Specifically,a Hamming distance and Euclidean distance combined method is designed to measure the similarity of case features which have both numeric and category properties.In addition,AHP(Analytic Hierarchy Process)and entropy weight method are integrated to provide features weight,where both user preferences and comprehensive impact of the index have been concerned.Grey relation analysis is used to obtain the similarity of a new problem and alternative cases.Finally,a platform is also developed on Visual Studio 2015,and a case study is demonstrated to verify the practicality and efficiency of the proposed method.This method can obtain cutting parameters which is suitable without iterative calculation.Compared with the traditional PSO(Particle swarm optimization algorithm)and GA(Genetic algorithm),it can obtain faster response speed.This method can provide ideas for selecting processing parameters in industrial production.While guaranteeing the characteristic information is similar,this approach can select processing parameters which is the most appropriate for the production process and a lot of time can be saved.展开更多
Experimental investigations on dynamic in-plane compressive behavior of a plain weave composite were performed using the split Hopkinson pressure bar. A quantitative criterion for calculating the constant strain rate ...Experimental investigations on dynamic in-plane compressive behavior of a plain weave composite were performed using the split Hopkinson pressure bar. A quantitative criterion for calculating the constant strain rate of composites was established. Then the upper limit of strain rate, restricted by stress equilibrium and constant loading rate, was rationally estimated and confirmed by tests. Within the achievable range of 0.001/s-895/s, it was found that the strength increased first and subsequently decreased as the strain rate increased. This feature was also reflected by the turning point(579/s) of the bilinear model for strength prediction. The transition in failure mechanism, from local opening damage to completely splitting destruction, was mainly responsible for such strain rate effects. And three major failure modes were summarized under microscopic observations: fiber fracture, inter-fiber fracture, and interface delamination. Finally, by introducing a nonlinear damage variable, a simplified ZWT model was developed to characterize the dynamic mechanical response. Excellent agreement was shown between the experimental and simulated results.展开更多
Amidst the swift advancement of new power systems and electric vehicles,inverter-fed machines have progressively materialized as a pivotal apparatus for efficient energy conversion.Stator winding turn insulation failu...Amidst the swift advancement of new power systems and electric vehicles,inverter-fed machines have progressively materialized as a pivotal apparatus for efficient energy conversion.Stator winding turn insulation failure is the root cause of inverter-fed machine breakdown.The online monitoring of turn insulation health can detect potential safety risks promptly,but faces the challenge of weak characteristics of turn insulation degradation.This study proposes an innovative method to evaluate the turn insulation state of inverter-fed machines by utilizing the fractional Fourier transform with a Mel filter(FrFT-Mel).First,the sensitivity of the high-frequency(HF)switching oscillation current to variations in turn insulation was analyzed within the fractional domain.Subsequently,an improved Mel filter is introduced,and its structure and parameters are specifically designed based on the features intrinsic to the common-mode impedance resonance point of the electrical machine.Finally,an evaluation index was proposed for the turn insulation state of inverter-fed machines.Experimental results on a 3kW permanent magnet synchronous machine(PMSM)demonstrate that the proposed FrFT-Mel method significantly enhances the sensitivity of turn insulation state perception by approximately five times,compared to the traditional Fourier transform method.展开更多
Since the 1990s the so-called spatial turn has brought back space and topography into the discussion within historical studies,particular ancient studies.This survey reviews current trends and developments within the ...Since the 1990s the so-called spatial turn has brought back space and topography into the discussion within historical studies,particular ancient studies.This survey reviews current trends and developments within the field and offers some perspectives on possible future developments related to space,material,objects,their agency,and frames.展开更多
The establishment of the US-Japan-ROK cooperation mechanism and its permanent presence in the region marks a historic turning point in trilateral relations.By synergizing the US-Japan and US-ROK alliances and enhancin...The establishment of the US-Japan-ROK cooperation mechanism and its permanent presence in the region marks a historic turning point in trilateral relations.By synergizing the US-Japan and US-ROK alliances and enhancing tripartite collaboration,the mechanism will be oriented to serving American strategic goals and have profound implications for the situation on the Korean Peninsula and the broader Northeast Asia.Despite its strategic intention and actual deployment to contain China,the US-promoted mechanism will not completely exclude or replace China-Japan-ROK dialogue and cooperation.展开更多
文摘From January to February,policies and measures to stabilize the economy were further effective,combined with factors such as the fading impact of the pandemic,and the resumption of production and business in China's garment industry accelerated steadily.The domestic garment market changed from a decline to an increase,and the market vitality continued to recover.However,due to the weakening of international market demand,order transfer and other reasons,China's garment exports are from positive growth to a significant decline In general,with domestic sales recovering and exports declining,the growth rate of major indicators such as production,benefit and investment of the garment industry showed an obvious negative growth trend.There are still great pressures and challenges for the industry to maintain a stable recovery.
文摘China International Publishing Group(CIPG)served as one of the first windows for the outside world to get to know China.Its predecessor,the International News Division of the National Press Administration of the Central Government,was founded the same day as the People’s Republic of China(PRC)on October 1,1949.Qiao Guanhua,who later became Minister of Foreign Affairs,first headed the division.New China’s foreign language publishing and distribution efforts began as quickly as anything else.
文摘Located in the southern part of Tianjin,a municipality neighboring Beijing,Nankai University was founded in August 1919.Over the past 100 years,the university has been a mosaic of China’s history.At the time of its birth,China was struggling under the rule of warlords who were battling for dominance after the fall of the Qing Dynasty(1644-1911),the last imperial dynasty of the country,and was in a fragmented state.Zhang Boling and Yan Xiu,two patriotic educators from Tianjin,had learned about modern educational systems abroad and decided to establish a modern system in their hometown to practice the philosophy of Saving the Nation Through Education.They started with Nankai Middle School in 1912.
文摘Success of the revolution represents but only the first step in a long march. ---Mao Zedong Mao Zedong’s announcement in 1949 that "the Chinese people have stoodup," ended the dark decades of domestic fragmentation and foreign subjugation,
文摘The Ningdong Energy and Chemical Industry Base in northwest China's Ningxia Hui Autonomous Region,one of China's major energy production bases,is eyeing opportunities in hydrogen energy production.In contrast to grey hydrogen,which is produced from natural gas,green hydrogen,which is made from water and renewable power,has been considered a more climate-friendly energy solution.Producing green hydrogen is critical for the mega coal-to-chemical industry base to move towards modem.
文摘Lao Zhang was a retired construction worker in Hohhot, capital of north China＇s Inner Mongolian Autonomous Region. The old man had worked to build apartment buildings all his life but never expected, even in a dream, to be able to set his home in one of them.
文摘On entering the mountainous vii lage of Yanbo in southwest China＇s Guizhou Province. the first thing noticeable is the flat roads and rows of new houses with cars parked in front of them. Against the hillside behind ihe houses are several bustling village run enterprises, including a distillery and poultry farms.
文摘Any organization that makes it to its 50th anniversary must have been doing something right. The African Union （AU） reached this milestone in May and can look back on the past half century as one in which Africa became independent and experienced positive gains in political and economic cooperation across the continent.
文摘E Ink's microcapsules are filled with a clear liquid that holds very small particles.Some particles are black.Some are white.All of the particles have an e- lectrical charge.To make a sheet of electronic paper, engineers spread millions of the particle-filled micro- capsules onto a piece of plastic.
文摘A physical education class got underway at a resort in Urumqi,Xinjiang Uygur Autonomous Region,on December 19,2023.During the off-campus lesson,students from Miaoergou Middle School went sking,supervised by instructors working at the Silk Road Mountain Resort,a well-equipped sking destination.
文摘Zhao Zhonghui,a Chinese-English translator,passed the China Accreditation Test for Translators and Interpreters(CATTI)Level 1,the highest level,in 2013.Zhao is now director of the translation center of MCC BERIS Engineering and Research Corp.,a subsidiary of state-owned China Metallurgical Group Corp.,based in Qingdao,Shandong Province.
文摘Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the stripper.In the high-energy mode of the booster ring(BRing)of the high-intensity heavy-ion accelerator facility,the pre-accelerated ions from the iLinac will be stripped by a carbon foil to higher charge states and then injected into the BRing.The key parameters of the stripper and stripped ions were calculated,and the influence of stripping on the beam quality was discussed.To get high stripping efficiencies,the foil thicknesses and resultant charge state distributions for the typical ions were determined by the code ETACHA.The equilibrium thickness was obtained for the U beam,while the stripper thicknesses for the Xe and Kr beams were determined based on a compromise between the stripped charge states and the stripping efficiency.The energy loss,energy straggling,and emittance growth due to stripping have a non-negligible impact on the transport of the stripped beams and the injection of the ring.Therefore,these parameters were simulated by GEANT4.In addition,the foil’s temperature evolution,which greatly affects the foil lifetime,was simulated by ANSYS.The maximum temperature of the foil bombarded by the U and Xe beams with the nominal parameters will exceed the safe value in terms of the impact of evaporation on the foil’s lifetime.Given the foil temperature constraint,the highest tolerable beam intensity and the injected ion number into the ring were derived for different beam sizes.The results of this paper will present important reference data for the optimization design and commissioning of the beamline and injection to the BRing for the stripped ions.
文摘In a secluded corner of a café,several young people sit around a small square table laden with an assortment of drinks and desserts.They take turns introducing themselves.The setup is reminiscent of speed dating or a team-building meeting,but the content of discussion is far from either.The unique event is known as Death Café.The purpose of the gathering is to discuss issues related to death.Participants express their thoughts,share experiences and rarely exposed emotions,and offer mutual support amidst a whirlwind of intense feelings.
基金the Sichuan Science and Technology Program(Nos.23ZHCG0049,2023YFG0078,23ZHCG0030,2021ZDZX0007)SCU-SUINING Project(2022CDSN-14).
文摘To solve the problem of long response time when users obtain suitable cutting parameters through the Internet based platform,a case-based reasoning framework is proposed.Specifically,a Hamming distance and Euclidean distance combined method is designed to measure the similarity of case features which have both numeric and category properties.In addition,AHP(Analytic Hierarchy Process)and entropy weight method are integrated to provide features weight,where both user preferences and comprehensive impact of the index have been concerned.Grey relation analysis is used to obtain the similarity of a new problem and alternative cases.Finally,a platform is also developed on Visual Studio 2015,and a case study is demonstrated to verify the practicality and efficiency of the proposed method.This method can obtain cutting parameters which is suitable without iterative calculation.Compared with the traditional PSO(Particle swarm optimization algorithm)and GA(Genetic algorithm),it can obtain faster response speed.This method can provide ideas for selecting processing parameters in industrial production.While guaranteeing the characteristic information is similar,this approach can select processing parameters which is the most appropriate for the production process and a lot of time can be saved.
基金the National Science and Technology Major Project(Grant No.2017-VII-0011-0106)Natural Science Foundation of Heilongjiang Province(Grant No.ZD2019A001).
文摘Experimental investigations on dynamic in-plane compressive behavior of a plain weave composite were performed using the split Hopkinson pressure bar. A quantitative criterion for calculating the constant strain rate of composites was established. Then the upper limit of strain rate, restricted by stress equilibrium and constant loading rate, was rationally estimated and confirmed by tests. Within the achievable range of 0.001/s-895/s, it was found that the strength increased first and subsequently decreased as the strain rate increased. This feature was also reflected by the turning point(579/s) of the bilinear model for strength prediction. The transition in failure mechanism, from local opening damage to completely splitting destruction, was mainly responsible for such strain rate effects. And three major failure modes were summarized under microscopic observations: fiber fracture, inter-fiber fracture, and interface delamination. Finally, by introducing a nonlinear damage variable, a simplified ZWT model was developed to characterize the dynamic mechanical response. Excellent agreement was shown between the experimental and simulated results.
基金supported in part by the National Natural Science Foundation of China under Grant 51907116in part sponsored by Natural Science Foundation of Shanghai 22ZR1425400sponsored by Shanghai Rising-Star Program 23QA1404000.
文摘Amidst the swift advancement of new power systems and electric vehicles,inverter-fed machines have progressively materialized as a pivotal apparatus for efficient energy conversion.Stator winding turn insulation failure is the root cause of inverter-fed machine breakdown.The online monitoring of turn insulation health can detect potential safety risks promptly,but faces the challenge of weak characteristics of turn insulation degradation.This study proposes an innovative method to evaluate the turn insulation state of inverter-fed machines by utilizing the fractional Fourier transform with a Mel filter(FrFT-Mel).First,the sensitivity of the high-frequency(HF)switching oscillation current to variations in turn insulation was analyzed within the fractional domain.Subsequently,an improved Mel filter is introduced,and its structure and parameters are specifically designed based on the features intrinsic to the common-mode impedance resonance point of the electrical machine.Finally,an evaluation index was proposed for the turn insulation state of inverter-fed machines.Experimental results on a 3kW permanent magnet synchronous machine(PMSM)demonstrate that the proposed FrFT-Mel method significantly enhances the sensitivity of turn insulation state perception by approximately five times,compared to the traditional Fourier transform method.
文摘Since the 1990s the so-called spatial turn has brought back space and topography into the discussion within historical studies,particular ancient studies.This survey reviews current trends and developments within the field and offers some perspectives on possible future developments related to space,material,objects,their agency,and frames.
文摘The establishment of the US-Japan-ROK cooperation mechanism and its permanent presence in the region marks a historic turning point in trilateral relations.By synergizing the US-Japan and US-ROK alliances and enhancing tripartite collaboration,the mechanism will be oriented to serving American strategic goals and have profound implications for the situation on the Korean Peninsula and the broader Northeast Asia.Despite its strategic intention and actual deployment to contain China,the US-promoted mechanism will not completely exclude or replace China-Japan-ROK dialogue and cooperation.
