Key policy document sets goals for China’s rural work for 2023 China has outlined nine key tasks for comprehensively promoting rural revitalisation this year in the “No.1 central document” of 2023 released on 13 Fe...Key policy document sets goals for China’s rural work for 2023 China has outlined nine key tasks for comprehensively promoting rural revitalisation this year in the “No.1 central document” of 2023 released on 13 February. As the first policy statement from China’s central authorities each year, the document.展开更多
Directly grasping the tightly stacked objects may cause collisions and result in failures,degenerating the functionality of robotic arms.Inspired by the observation that first pushing objects to a state of mutual sepa...Directly grasping the tightly stacked objects may cause collisions and result in failures,degenerating the functionality of robotic arms.Inspired by the observation that first pushing objects to a state of mutual separation and then grasping them individually can effectively increase the success rate,we devise a novel deep Q-learning framework to achieve collaborative pushing and grasping.Specifically,an efficient non-maximum suppression policy(PolicyNMS)is proposed to dynamically evaluate pushing and grasping actions by enforcing a suppression constraint on unreasonable actions.Moreover,a novel data-driven pushing reward network called PR-Net is designed to effectively assess the degree of separation or aggregation between objects.To benchmark the proposed method,we establish a dataset containing common household items dataset(CHID)in both simulation and real scenarios.Although trained using simulation data only,experiment results validate that our method generalizes well to real scenarios and achieves a 97%grasp success rate at a fast speed for object separation in the real-world environment.展开更多
The movie Pushing Hands demonstrated the conflicts in the process of intercultural communication between China andwestern countries, revealing different perspectives of culture values. However, these conflicts of inte...The movie Pushing Hands demonstrated the conflicts in the process of intercultural communication between China andwestern countries, revealing different perspectives of culture values. However, these conflicts of intercultural communication canbe handled by accepting and communicating, and understanding others' cultures.展开更多
The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection l...The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection locking theory which is widely used nowadays is based on the simplified oscillator, which does not include the frequency pushing effect of the magnetron. In this paper, the theory of injection locking magnetrons with frequency pushing effect is systematically studied.Analytical analysis shows that the locking bandwidth turns larger with the consideration of the pushing parameter(α), and the increase of locking bandwidth is expanded with α increasing. Experimental results show that the locking bandwidth is expanded by 0.3 MHz, 1 MHz, and 1.6 MHz compared with the locking bandwidth from the conventional locking theory under an injection ratio(ρ) of 0.05, 0.075, and 0.1, respectively. This research provides a more accurate prediction of the properties of the injection-locked magnetron.展开更多
THE Fourth Industrial Revolution has set off a wave of technological innovation. New technologies, such as artificial intelligence, virtual reality, quantum information technology, unmanned technology, and biotechnolo...THE Fourth Industrial Revolution has set off a wave of technological innovation. New technologies, such as artificial intelligence, virtual reality, quantum information technology, unmanned technology, and biotechnology, have sprung up at an unprecedented rate, injecting new impetus into the development of the world economy and bringing the global economy into a new era.展开更多
President Jiang Zeming’s U.S.visit together with Jiang-Clinton WashingtonSummit last October has worked out the direction and a basic framework forChina-U.S.relations in the 21st century.It represents a landmark in t...President Jiang Zeming’s U.S.visit together with Jiang-Clinton WashingtonSummit last October has worked out the direction and a basic framework forChina-U.S.relations in the 21st century.It represents a landmark in the annualsof bilateral ties between the two great nations.This is the first year,when bothshores of the Pacific Ocean are working hard to lay bricks for a constructive strate-展开更多
I.The Situation of China’s People-to-People Diplomacy in the New Era As an indispensable part in China’s overall diplomacy, the people-to-people diplomacy aims at enhancing the friendship between peoples, and hence ...I.The Situation of China’s People-to-People Diplomacy in the New Era As an indispensable part in China’s overall diplomacy, the people-to-people diplomacy aims at enhancing the friendship between peoples, and hence promoting state-to-state relations. As one of the most vibrant areas with full development potential in China’s overall diplomacy,展开更多
Translating cultural specific items(CSI)in a movie involves the culture behind the terms,CSI translation methodologyand the subtitle translation methodology,which makes subtitles in Pushing Hands(推手)about the Chines...Translating cultural specific items(CSI)in a movie involves the culture behind the terms,CSI translation methodologyand the subtitle translation methodology,which makes subtitles in Pushing Hands(推手)about the Chinese medicine more difficultto translate.In Pushing Hands,frequent emergence of CSI poses a challenge for translators.Likewise,reproducing the aesthetic ef-fects of a Chinese poem can be impeded in the clash of distinct cultures.Therefore,our group studied related samples,drawing ontheories like skopos,text typology,functional equivalence,etc.展开更多
The Kenyan Government has a full agenda for 2011 by Alphonce Shiundu FOR Kenya,the year 2011 is the year when the country will determine whether it wants to move to the promised land of justice,good governance and pro...The Kenyan Government has a full agenda for 2011 by Alphonce Shiundu FOR Kenya,the year 2011 is the year when the country will determine whether it wants to move to the promised land of justice,good governance and prosperity;or sink back to its dubious past of tribalism,impunity, corruption and extreme poverty. It’s a make-or-break year for the 47-year-old independent country.Looking at the government’s in-tray for展开更多
On 9 September 2016,global Internet data traffic flew past the milestone of 1 ZB,or 1021 bytes-a trillion gigabytes-per year.If you imagine every one of those gigabytes as a brick,a trillion of them would allow you to...On 9 September 2016,global Internet data traffic flew past the milestone of 1 ZB,or 1021 bytes-a trillion gigabytes-per year.If you imagine every one of those gigabytes as a brick,a trillion of them would allow you to build 258 Great Walls of China,one analyst estimated[1].It took nearly 40 years for the Internet to hit that mark.By 2022,annual Internet traffic is expected to reach almost 5 ZB[2].展开更多
On 4th July,2022,a campaign for boosting the acceptance of geothermal energy utilization among the public was co-sponsored by the China Association for Science and Technology and SINOPEC,one of the three state-owned o...On 4th July,2022,a campaign for boosting the acceptance of geothermal energy utilization among the public was co-sponsored by the China Association for Science and Technology and SINOPEC,one of the three state-owned oil majors in China.The campaign marks the very first geothermal energy exhibition in the country.展开更多
Multipolarity is deepening while Western power fades.To defend sovereignty and development and to promote peaceful coexistence,nations of the Global Majority,a collective term for ethnic groups that are not considered...Multipolarity is deepening while Western power fades.To defend sovereignty and development and to promote peaceful coexistence,nations of the Global Majority,a collective term for ethnic groups that are not considered to be white and constitute approximately85 percent of the global population,must strengthen their discourse capacity.展开更多
At the invitation of German Chancellor Olaf Scholz and the French Government,Chinese Premier Li Qiang visited the two countries from June 18 to 23.This was also his first foreign trip since taking office as Chinese pr...At the invitation of German Chancellor Olaf Scholz and the French Government,Chinese Premier Li Qiang visited the two countries from June 18 to 23.This was also his first foreign trip since taking office as Chinese premier in March.展开更多
The frontier orbital interactions of electron pushing and drawing substituents with ferrocenyl group were analyzed based on the electrochemical,UV visible spectral and spectroelectrochemical results of five ferrocene ...The frontier orbital interactions of electron pushing and drawing substituents with ferrocenyl group were analyzed based on the electrochemical,UV visible spectral and spectroelectrochemical results of five ferrocene derivatives,R-Fc-A1(PⅠ),A1-Fc-A1(PⅡ),D-Fc-R (PⅢ),D-Kc-A1(PIV) and D-Fc-A2(PV)(R,CH2OH;A1 CHO;A2,CH=C(CN)2 and D,(C18H37)2N-C6H4-CH=CH) It was found that there are strong interactions of the LUMO (πA) of electron drawing substituents with le2g(dxy,dx2 y2)and e2u of the ferroeenyl group because the energy levels of πA and e2g,C2U of (Cp )2 are close,which lower not only the energy levels of bonded orbits,πA+ and dx2-y2+[πA] of PⅠ,PⅡ,PⅣ and PⅤobviously,but also those of their non-bonded orbu dxy For PⅢ,PⅣ and PⅤ,there are strong interactions of HOMO(πD) of the electron pushing substituent with le of the ferrocenyl group because the levels of πD and e of (Cp)2 are close,which result in the formation of anti-bonded orbit,πD- and bonded展开更多
Confining stresses serve as a pivotal determinant in shaping the behavior of grouted rock bolts.Nonetheless,prior investigations have oversimplified the three-dimensional stress state,primarily assuming hydrostatic st...Confining stresses serve as a pivotal determinant in shaping the behavior of grouted rock bolts.Nonetheless,prior investigations have oversimplified the three-dimensional stress state,primarily assuming hydrostatic stress conditions.Under these conditions,it is assumed that the intermediate principal stress(σ_(2))equals the minimum principal stress(σ_(3)).This assumption overlooks the potential variations in magnitudes of in situ stress conditions along all three directions near an underground opening where a rock bolt is installed.In this study,a series of push tests was meticulously conducted under triaxial conditions.These tests involved applying non-uniform confining stresses(σ_(2)≠σ_(3))to cubic specimens,aiming to unveil the previously overlooked influence of intermediate principal stresses on the strength properties of rock bolts.The results show that as the confining stresses increase from zero to higher levels,the pre-failure behavior changes from linear to nonlinear forms,resulting in an increase in initial stiffness from 2.08 kN/mm to 32.51 kN/mm.The load-displacement curves further illuminate distinct post-failure behavior at elevated levels of confining stresses,characterized by enhanced stiffness.Notably,the peak load capacity ranged from 27.9 kN to 46.5 kN as confining stresses advanced from σ_(2)=σ_(3)=0 to σ_(2)=20 MPa and σ_(3)=10 MPa.Additionally,the outcomes highlight an influence of confining stress on the lateral deformation of samples.Lower levels of confinement prompt overall dilation in lateral deformation,while higher confinements maintain a state of shrinkage.Furthermore,diverse failure modes have been identified,intricately tied to the arrangement of confining stresses.Lower confinements tend to induce a splitting mode of failure,whereas higher loads bring about a shift towards a pure interfacial shear-off and shear-crushed failure mechanism.展开更多
Afterburning behind the detonation front of an aluminized explosive releases energy on the millisecond timescale,which prolong the release of detonation energy and the energy release at different stages also shows sig...Afterburning behind the detonation front of an aluminized explosive releases energy on the millisecond timescale,which prolong the release of detonation energy and the energy release at different stages also shows significant differences.However,at present,there are few effective methods for evaluating the energy release characteristics of the middle reaction stage of such explosives,which can have a duration of tens to hundreds of microseconds.The present work demonstrates an approach to assessing the midstage of an aluminized explosive detonation based on a water push test employing a high degree of confinement.In this method,the explosive is contained in a steel cylinder having one end closed that is installed at the bottom of a transparent water tank.Upon detonation,the gaseous products expand in one direction while forcing water ahead of them.The resulting underwater shock wave and the interface between the gas phase products and the water are tracked using an ultra-high-speed framing and streak camera.The shock wave velocity in water and the expansion work performed by the gaseous detonation products were calculated to assess the energy release characteristics of aluminized explosives such as CL-20 and RDX in the middle stage of the detonation reaction.During the middle stage of the detonation process of these aluminized explosives,the aluminum reaction reduced the attenuation of shock waves and increased the work performed by gas phase products.A higher aluminum content increased the energy output while the presence of oxidants slowed the energy release rate.This work demonstrates an effective means of evaluating the performance of aluminized explosives.展开更多
In recent years,China has implemented measures to advance the building of a unified national market,aiming to boost domestic demand and consolidate the foundations of its economic recovery.In March 2022,the Chinese go...In recent years,China has implemented measures to advance the building of a unified national market,aiming to boost domestic demand and consolidate the foundations of its economic recovery.In March 2022,the Chinese government issued a guideline on accelerating the construction of a unified national market.The issue was also a focus at the annual Central Economic Work Conference held in December 2023.展开更多
文摘Key policy document sets goals for China’s rural work for 2023 China has outlined nine key tasks for comprehensively promoting rural revitalisation this year in the “No.1 central document” of 2023 released on 13 February. As the first policy statement from China’s central authorities each year, the document.
基金This work was supported by the National Natural Science Foundation of China(61873077,61806062)Zhejiang Provincial Major Research and Development Project of China(2020C01110)Zhejiang Provincial Key Laboratory of Equipment Electronics.
文摘Directly grasping the tightly stacked objects may cause collisions and result in failures,degenerating the functionality of robotic arms.Inspired by the observation that first pushing objects to a state of mutual separation and then grasping them individually can effectively increase the success rate,we devise a novel deep Q-learning framework to achieve collaborative pushing and grasping.Specifically,an efficient non-maximum suppression policy(PolicyNMS)is proposed to dynamically evaluate pushing and grasping actions by enforcing a suppression constraint on unreasonable actions.Moreover,a novel data-driven pushing reward network called PR-Net is designed to effectively assess the degree of separation or aggregation between objects.To benchmark the proposed method,we establish a dataset containing common household items dataset(CHID)in both simulation and real scenarios.Although trained using simulation data only,experiment results validate that our method generalizes well to real scenarios and achieves a 97%grasp success rate at a fast speed for object separation in the real-world environment.
文摘The movie Pushing Hands demonstrated the conflicts in the process of intercultural communication between China andwestern countries, revealing different perspectives of culture values. However, these conflicts of intercultural communication canbe handled by accepting and communicating, and understanding others' cultures.
基金Project supported by the Sichuan Science and Technology Program,China(Grant No.2019YFG0419)the National Natural Science Foundation of China(Grant No.61601312)
文摘The applications of magnetrons are greatly limited because of the poor output spectrum of the free-running magnetron.Currently, one of the best ways to solve this problem is injection locking. However, the injection locking theory which is widely used nowadays is based on the simplified oscillator, which does not include the frequency pushing effect of the magnetron. In this paper, the theory of injection locking magnetrons with frequency pushing effect is systematically studied.Analytical analysis shows that the locking bandwidth turns larger with the consideration of the pushing parameter(α), and the increase of locking bandwidth is expanded with α increasing. Experimental results show that the locking bandwidth is expanded by 0.3 MHz, 1 MHz, and 1.6 MHz compared with the locking bandwidth from the conventional locking theory under an injection ratio(ρ) of 0.05, 0.075, and 0.1, respectively. This research provides a more accurate prediction of the properties of the injection-locked magnetron.
文摘THE Fourth Industrial Revolution has set off a wave of technological innovation. New technologies, such as artificial intelligence, virtual reality, quantum information technology, unmanned technology, and biotechnology, have sprung up at an unprecedented rate, injecting new impetus into the development of the world economy and bringing the global economy into a new era.
文摘President Jiang Zeming’s U.S.visit together with Jiang-Clinton WashingtonSummit last October has worked out the direction and a basic framework forChina-U.S.relations in the 21st century.It represents a landmark in the annualsof bilateral ties between the two great nations.This is the first year,when bothshores of the Pacific Ocean are working hard to lay bricks for a constructive strate-
文摘I.The Situation of China’s People-to-People Diplomacy in the New Era As an indispensable part in China’s overall diplomacy, the people-to-people diplomacy aims at enhancing the friendship between peoples, and hence promoting state-to-state relations. As one of the most vibrant areas with full development potential in China’s overall diplomacy,
文摘Translating cultural specific items(CSI)in a movie involves the culture behind the terms,CSI translation methodologyand the subtitle translation methodology,which makes subtitles in Pushing Hands(推手)about the Chinese medicine more difficultto translate.In Pushing Hands,frequent emergence of CSI poses a challenge for translators.Likewise,reproducing the aesthetic ef-fects of a Chinese poem can be impeded in the clash of distinct cultures.Therefore,our group studied related samples,drawing ontheories like skopos,text typology,functional equivalence,etc.
文摘The Kenyan Government has a full agenda for 2011 by Alphonce Shiundu FOR Kenya,the year 2011 is the year when the country will determine whether it wants to move to the promised land of justice,good governance and prosperity;or sink back to its dubious past of tribalism,impunity, corruption and extreme poverty. It’s a make-or-break year for the 47-year-old independent country.Looking at the government’s in-tray for
文摘On 9 September 2016,global Internet data traffic flew past the milestone of 1 ZB,or 1021 bytes-a trillion gigabytes-per year.If you imagine every one of those gigabytes as a brick,a trillion of them would allow you to build 258 Great Walls of China,one analyst estimated[1].It took nearly 40 years for the Internet to hit that mark.By 2022,annual Internet traffic is expected to reach almost 5 ZB[2].
文摘On 4th July,2022,a campaign for boosting the acceptance of geothermal energy utilization among the public was co-sponsored by the China Association for Science and Technology and SINOPEC,one of the three state-owned oil majors in China.The campaign marks the very first geothermal energy exhibition in the country.
文摘Multipolarity is deepening while Western power fades.To defend sovereignty and development and to promote peaceful coexistence,nations of the Global Majority,a collective term for ethnic groups that are not considered to be white and constitute approximately85 percent of the global population,must strengthen their discourse capacity.
文摘At the invitation of German Chancellor Olaf Scholz and the French Government,Chinese Premier Li Qiang visited the two countries from June 18 to 23.This was also his first foreign trip since taking office as Chinese premier in March.
基金Project supported by the National Natural Science Foundation of China
文摘The frontier orbital interactions of electron pushing and drawing substituents with ferrocenyl group were analyzed based on the electrochemical,UV visible spectral and spectroelectrochemical results of five ferrocene derivatives,R-Fc-A1(PⅠ),A1-Fc-A1(PⅡ),D-Fc-R (PⅢ),D-Kc-A1(PIV) and D-Fc-A2(PV)(R,CH2OH;A1 CHO;A2,CH=C(CN)2 and D,(C18H37)2N-C6H4-CH=CH) It was found that there are strong interactions of the LUMO (πA) of electron drawing substituents with le2g(dxy,dx2 y2)and e2u of the ferroeenyl group because the energy levels of πA and e2g,C2U of (Cp )2 are close,which lower not only the energy levels of bonded orbits,πA+ and dx2-y2+[πA] of PⅠ,PⅡ,PⅣ and PⅤobviously,but also those of their non-bonded orbu dxy For PⅢ,PⅣ and PⅤ,there are strong interactions of HOMO(πD) of the electron pushing substituent with le of the ferrocenyl group because the levels of πD and e of (Cp)2 are close,which result in the formation of anti-bonded orbit,πD- and bonded
文摘Confining stresses serve as a pivotal determinant in shaping the behavior of grouted rock bolts.Nonetheless,prior investigations have oversimplified the three-dimensional stress state,primarily assuming hydrostatic stress conditions.Under these conditions,it is assumed that the intermediate principal stress(σ_(2))equals the minimum principal stress(σ_(3)).This assumption overlooks the potential variations in magnitudes of in situ stress conditions along all three directions near an underground opening where a rock bolt is installed.In this study,a series of push tests was meticulously conducted under triaxial conditions.These tests involved applying non-uniform confining stresses(σ_(2)≠σ_(3))to cubic specimens,aiming to unveil the previously overlooked influence of intermediate principal stresses on the strength properties of rock bolts.The results show that as the confining stresses increase from zero to higher levels,the pre-failure behavior changes from linear to nonlinear forms,resulting in an increase in initial stiffness from 2.08 kN/mm to 32.51 kN/mm.The load-displacement curves further illuminate distinct post-failure behavior at elevated levels of confining stresses,characterized by enhanced stiffness.Notably,the peak load capacity ranged from 27.9 kN to 46.5 kN as confining stresses advanced from σ_(2)=σ_(3)=0 to σ_(2)=20 MPa and σ_(3)=10 MPa.Additionally,the outcomes highlight an influence of confining stress on the lateral deformation of samples.Lower levels of confinement prompt overall dilation in lateral deformation,while higher confinements maintain a state of shrinkage.Furthermore,diverse failure modes have been identified,intricately tied to the arrangement of confining stresses.Lower confinements tend to induce a splitting mode of failure,whereas higher loads bring about a shift towards a pure interfacial shear-off and shear-crushed failure mechanism.
基金supported by the National Natural Science Foundation of China(Grant No.11832006)。
文摘Afterburning behind the detonation front of an aluminized explosive releases energy on the millisecond timescale,which prolong the release of detonation energy and the energy release at different stages also shows significant differences.However,at present,there are few effective methods for evaluating the energy release characteristics of the middle reaction stage of such explosives,which can have a duration of tens to hundreds of microseconds.The present work demonstrates an approach to assessing the midstage of an aluminized explosive detonation based on a water push test employing a high degree of confinement.In this method,the explosive is contained in a steel cylinder having one end closed that is installed at the bottom of a transparent water tank.Upon detonation,the gaseous products expand in one direction while forcing water ahead of them.The resulting underwater shock wave and the interface between the gas phase products and the water are tracked using an ultra-high-speed framing and streak camera.The shock wave velocity in water and the expansion work performed by the gaseous detonation products were calculated to assess the energy release characteristics of aluminized explosives such as CL-20 and RDX in the middle stage of the detonation reaction.During the middle stage of the detonation process of these aluminized explosives,the aluminum reaction reduced the attenuation of shock waves and increased the work performed by gas phase products.A higher aluminum content increased the energy output while the presence of oxidants slowed the energy release rate.This work demonstrates an effective means of evaluating the performance of aluminized explosives.
文摘In recent years,China has implemented measures to advance the building of a unified national market,aiming to boost domestic demand and consolidate the foundations of its economic recovery.In March 2022,the Chinese government issued a guideline on accelerating the construction of a unified national market.The issue was also a focus at the annual Central Economic Work Conference held in December 2023.
