The quasi-alliance strategy is part of the national security strategy and lies in the grey area between alliance and neutrality.1 In recent years,major countries,including Japan,have positioned quasi-alliance as a fea...The quasi-alliance strategy is part of the national security strategy and lies in the grey area between alliance and neutrality.1 In recent years,major countries,including Japan,have positioned quasi-alliance as a feasible unwritten option in their respective national security strategies.2 Japan’s quasialliance strategy was already in its infancy when former Japanese Prime Minister Shinzo Abe first came to power in September 2006 but was put on hold after his resignation in September 2007.展开更多
Blockchain,known for its secure encrypted ledger,has garnered attention in financial and data transfer realms,including the field of energy trading.However,the decentralized nature and identity anonymity of user nodes...Blockchain,known for its secure encrypted ledger,has garnered attention in financial and data transfer realms,including the field of energy trading.However,the decentralized nature and identity anonymity of user nodes raise uncertainties in energy transactions.The broadcast consensus authentication slows transaction speeds,and frequent single-point transactions in multi-node settings pose key exposure risks without protective measures during user signing.To address these,an alliance blockchain scheme is proposed,reducing the resource-intensive identity verification among nodes.It integrates multi-signature functionality to fortify user resources and transac-tion security.A novel multi-signature process within this framework involves neutral nodes established through central nodes.These neutral nodes participate in multi-signature’s signing and verification,ensuring user identity and transaction content privacy.Reducing interactions among user nodes enhances transaction efficiency by minimizing communication overhead during verification and consensus stages.Rigorous assessments on reliability and operational speed highlight superior security performance,resilient against conventional attack vectors.Simulation shows that compared to traditional solutions,this scheme has advantages in terms of running speed.In conclusion,the alliance blockchain framework introduces a novel approach to tackle blockchain’s limitations in energy transactions.The integrated multi-signature process,involving neutral nodes,significantly enhances security and privacy.The scheme’s efficiency,validated through analytical assessments and simulations,indicates robustness against security threats and improved transactional speeds.This research underscores the potential for improved security and efficiency in blockchain-enabled energy trading systems.展开更多
This study delves into the formation dynamics of alliances within a closed-loop supply chain(CLSC)that encom-passes a manufacturer,a retailer,and an e-commerce platform.It leverages Stackelberg game for this explorati...This study delves into the formation dynamics of alliances within a closed-loop supply chain(CLSC)that encom-passes a manufacturer,a retailer,and an e-commerce platform.It leverages Stackelberg game for this exploration,contrasting the equilibrium outcomes of a non-alliance model with those of three differentiated alliance models.The non-alliance model acts as a crucial benchmark,enabling the evaluation of the motivations for various supply chain entities to engage in alliance formations.Our analysis is centered on identifying the most effective alliance strategies and establishing a coordination within these partnerships.We thoroughly investigate the consequences of diverse alliance behaviors,bidirectional free-riding and cost-sharing,and the resultant effects on the optimal decision-making among supply chain actors.The findings underscore several pivotal insights:(1)The behavior of alliances within the supply chain exerts variable impacts on the optimal pricing and demand of its members.In comparison to the non-alliance(D)model,the manufacturer-retailer(MR)and manufacturer-e-commerce platform(ME)alliances significantly lower both offline and online resale prices for new and remanufactured goods.This adjustment leads to an enhanced demand for products via the MR alliance’s offline outlets and the ME alliance’s online platforms,thereby augmenting the profits for those within the alliance.Conversely,retailer-e-commerce platform(ER)alliance tends to increase the optimal retail price and demand across both online and offline channels.Under specific conditions,alliance behavior can also increase the profits of non-alliance members,and the profits derived through alliance channels also exceed those from non-alliance channels.(2)The prevalence of bidirectional free-riding behavior largely remains constant across different alliance configurations.Across these models,bidirectional free-riding typically elevates the equilibrium prices in offline channel while negatively affecting the equilibrium prices in other channel.(3)The effect of cost-sharing shows relative uniformity across the various alliance models.Across all configurations,cost-sharing tends to reduce the manufacturer’s profits.Nonetheless,alliances initiated by the manufacturer can counteract these negative impacts,providing a strategic pathway to bolster CLSC profitability.展开更多
Building a technology alliance is the main strategy for the United States to maintain its scientific and technological hegemony under its technopolitical strategic framework.After Joe Biden took office,the United Stat...Building a technology alliance is the main strategy for the United States to maintain its scientific and technological hegemony under its technopolitical strategic framework.After Joe Biden took office,the United States implemented“small yard with high fences”strategy for scientific and technological competition,as the first step toward building a technology alliance.The main goal is to restrict the flow of strategic emerging technologies and factors of innovation to rival countries.展开更多
With the development of renewable energy technologies such as photovoltaics and wind power,it has become a research hotspot to improve the consumption rate of new energy and reduce energy costs through the deployment ...With the development of renewable energy technologies such as photovoltaics and wind power,it has become a research hotspot to improve the consumption rate of new energy and reduce energy costs through the deployment of energy storage.To solve the problem of the interests of different subjects in the operation of the energy storage power stations(ESS)and the integrated energy multi-microgrid alliance(IEMA),this paper proposes the optimization operation method of the energy storage power station and the IEMA based on the Stackelberg game.In the upper layer,ESS optimizes charging and discharging decisions through a dynamic pricing mechanism.In the lower layer,IEMA optimizes the output of various energy conversion coupled devices within the IEMA,as well as energy interaction and demand response(DR),based on the energy interaction prices provided by ESS.The results demonstrate that the optimization strategy proposed in this paper not only effectively balances the benefits of the IEMA and ESS but also enhances energy consumption rates and reduces IEMA energy costs.展开更多
Themed"Digital Education:Application,Sharing,and Innovation",the 2024 World Digital Education Conference opened in Shanghai on January 3Oth.Secretary of CPC Shanghai Municipal Committee Chen Jining,Vice-Chai...Themed"Digital Education:Application,Sharing,and Innovation",the 2024 World Digital Education Conference opened in Shanghai on January 3Oth.Secretary of CPC Shanghai Municipal Committee Chen Jining,Vice-Chairperson of the Standing Committee of the National People's Congress of China Cai Dafeng,and President of the 42nd session of the UNESCO General Conference Simona-Mirela Miculescu attended the opening ceremony and delivered speeches.展开更多
To implement the National Standardization Development Outline and Hubei’s relevant supporting policies,the launching ceremony of Hubei Association Standardization Development Alliance was held in Wuhan,Hubei province...To implement the National Standardization Development Outline and Hubei’s relevant supporting policies,the launching ceremony of Hubei Association Standardization Development Alliance was held in Wuhan,Hubei province on June 28,which was hosted by Hubei Institute of Standardization and Quality,and jointly held by Optics Valley of China and Hubei Optics Valley Standard Innovate Technology Co.,Ltd.The alliance was initiated by 94 units in Hubei,including research institutions,enterprises,industrial associations,and universities.The ceremony was attended by Yu Xinli,President of China Association for Standardization,Pan Niansong,Director-General of Hubei Medical Products Administration,Xu Qinxiang,Head of Standardization Division of Hubei Administration for Market Regulation,and representatives from members of the alliance.展开更多
After the Cold War and especially since the Justice and Development Party administration led by Erdogan,the US-Turkey alliance relations have declined.The two countries have sharp structural contradictions on a series...After the Cold War and especially since the Justice and Development Party administration led by Erdogan,the US-Turkey alliance relations have declined.The two countries have sharp structural contradictions on a series of issues.Due to the profound geopolitical landscape changes,the interdependence on security and defense between the United States and Turkey has been severely weakened,leading to significant divergence in threat definition and pursuit of interests.Turkey has continuously enhanced its diplomatic autonomy,seeking to change its weak position in the original alliance relations,and striving to become a regional leader.These structural contradictions inevitably trigger the hedging of policies and interests between the United States and Turkey.展开更多
I am very pleased and privileged to be addressing the thematic segment of the Third Belt and Road Forum for the second time.I am also delighted to be back to Beijing in less than 3 months.My latest visit was in last J...I am very pleased and privileged to be addressing the thematic segment of the Third Belt and Road Forum for the second time.I am also delighted to be back to Beijing in less than 3 months.My latest visit was in last July at the invitation of the Chinese Association for International Understanding.展开更多
BASED on the Belt and Road Initiative(BRI)proposed by Chinese President Xi Jinping in 2013,the Belt and Road Film Festival Alliance and the Belt and Road Film Week were founded at the 21st Shanghai International Film ...BASED on the Belt and Road Initiative(BRI)proposed by Chinese President Xi Jinping in 2013,the Belt and Road Film Festival Alliance and the Belt and Road Film Week were founded at the 21st Shanghai International Film Festival(SIFF)in June 2018.In the past five years membership of the alliance has grown from 31 film institutions in 29 countries to 55 institutions in 48 countries.展开更多
On September 1,2023,a launch ceremony for the International Tourism Alliance of Silk Road Cities was held in Jingdezhen,Jiangxi Province,along with a series of other activities,including the“International Forum on Cu...On September 1,2023,a launch ceremony for the International Tourism Alliance of Silk Road Cities was held in Jingdezhen,Jiangxi Province,along with a series of other activities,including the“International Forum on Culture and Tourism Development of Silk Road Cities”2023,and the“Charming Silk Road,Connecting the World-Silk Road Tourism Cities Joint Promotion Exhibition”.展开更多
2023 World Tourism Alliance(WTA)·Xianghu Dialogue,focusing on cooperation,transformation,co-creation,sharing,empowerment,and gathering momentum,aims to explore the potential of tourism in connecting the world,boo...2023 World Tourism Alliance(WTA)·Xianghu Dialogue,focusing on cooperation,transformation,co-creation,sharing,empowerment,and gathering momentum,aims to explore the potential of tourism in connecting the world,boosting economies,fostering innovation,promoting industry integration,and accelerating sustainable high-quality development.展开更多
Silicon passivated emitter and rear contact(PERC) solar cells with V-groove texture were fabricated using maskless alkaline solution etching with in-house developed additive. Compared with the traditional pyramid text...Silicon passivated emitter and rear contact(PERC) solar cells with V-groove texture were fabricated using maskless alkaline solution etching with in-house developed additive. Compared with the traditional pyramid texture, the V-groove texture possesses superior effective minority carrier lifetime, enhanced p–n junction quality and better applied filling factor(FF). In addition, a V-groove texture can greatly reduce the shading area and edge damage of front Ag electrodes when the V-groove direction is parallel to the gridline electrodes. Due to these factors, the V-groove solar cells have a higher efficiency(21.78%) than pyramid solar cells(21.62%). Interestingly, external quantum efficiency(EQE) and reflectance of the V-groove solar cells exhibit a slight decrease when the incident light angle(θ) is increased from 0° to 75°, which confirms the excellent quasi omnidirectionality of the V-groove solar cells. The proposed V-groove solar cell design shows a 2.84% relative enhancement of energy output over traditional pyramid solar cells.展开更多
Continuum robots with high flexibility and compliance have the capability to operate in confined and cluttered environments. To enhance the load capacity while maintaining robot dexterity, we propose a novel non-const...Continuum robots with high flexibility and compliance have the capability to operate in confined and cluttered environments. To enhance the load capacity while maintaining robot dexterity, we propose a novel non-constant subsegment stiffness structure for tendon-driven quasi continuum robots(TDQCRs) comprising rigid-flexible coupling subsegments.Aiming at real-time control applications, we present a novel static-to-kinematic modeling approach to gain a comprehensive understanding of the TDQCR model. The analytical subsegment-based kinematics for the multisection manipulator is derived based on screw theory and product of exponentials formula, and the static model considering gravity loading,actuation loading, and robot constitutive laws is established. Additionally, the effect of tension attenuation caused by routing channel friction is considered in the robot statics, resulting in improved model accuracy. The root-mean-square error between the outputs of the static model and the experimental system is less than 1.63% of the arm length(0.5 m). By employing the proposed static model, a mapping of bending angles between the configuration space and the subsegment space is established. Furthermore, motion control experiments are conducted on our TDQCR system, and the results demonstrate the effectiveness of the static-to-kinematic model.展开更多
In a paper conceived about five years ago(“Globalization and Public Goods:Too Big to Tackle?”)roughly a dozen factors were linked to explain important causal paths from globalization to the potential output of publi...In a paper conceived about five years ago(“Globalization and Public Goods:Too Big to Tackle?”)roughly a dozen factors were linked to explain important causal paths from globalization to the potential output of public goods.The Russian invasion of Ukraine,the corona epidemic,and the increased hegemonic rivalry between China and the U.S.interrupted or even destroyed many of the linkages between globalization and potential public good production.About five important detrimental paths involved in the meantime.In the present article we aim at linking what is left from the previous level of globalization or emerging to form a new and simplified causal model for likely linkages between truncated or(re-)emerging globalization,and the deadly needed output of public goods.These linkages refer to rules of climate control,go to trade linkages and arbitrary tariffs and trade interventions.Regime change,regime formation,and alliance restructuring address aspects of domestic rule and international stability.Selectorate theory,regime type,and exit options for political elites provide key explanatory factors in explaining globalization and public goods productions,or their decay.Where possible we use some data and transformation experiences corroborating our arguments.In other instances need for further empirical macro research will become clear.展开更多
Damage caused due to low-velocity impacts in composites leads to substantial deterioration in their residual strength and eventually provokes structural failure.This work presents an experimental investigation on the ...Damage caused due to low-velocity impacts in composites leads to substantial deterioration in their residual strength and eventually provokes structural failure.This work presents an experimental investigation on the effects of different patch and parent laminate stacking sequences on the enhancement of impact strength of Carbon Fiber Reinforced Polymers(CFRP)composites by utilising the adhesively bonded external patch repair technique.Damage evolution study is also performed with the aid of Acoustic Emission(AE).Two different quasi-isotropic configurations were selected for the parent laminate,viz.,[45°/45°/0°/0°]s and[45°/0°/45°/0°]s.Quasi Static Indentation(QSI)test was performed on both the pristine laminates,and damage areas were detected by using the C-scan inspection technique.Damaged laminates were repaired by using a single-sided patch of two different configurations,viz.,[45°/45°/45°/45°]and[45°/0°/0°/45°],and employing a circular plug to fill the damaged hole.Four different combinations of repaired laminates with two configurations of each parent and patch laminate were produced,which were further subjected to the QSI test.The results reveal the effectiveness of the repair method,as all the repaired laminates show higher impact resistance compared to the respective pristine laminates.Patches of[45°/0°/0°/45°]configuration when repaired by taking[45°/45°/0°/0°]s and[45°/0°/45°/0°]s as parents exhibited 68%and 73%higher peak loads,respectively,than the respective pristine laminates.Furthermore,parent and patch of configuration[45°/0°/45°/0°]s and[45°/0°/0°/45°],respectively,attain the highest peak load,whereas[45°/45°/0°/0°]s and[45°/45°/45°/45°]combinations possess the most gradual decrease in the load.展开更多
Syria and Iran have formed a special relation in the past four decades. While researchers of international relations have probed deeply into alliance theory in the past half century, current literature in this field c...Syria and Iran have formed a special relation in the past four decades. While researchers of international relations have probed deeply into alliance theory in the past half century, current literature in this field can hardly explain the informal mechanism for Syria-Iran security cooperation. To unravel the puzzle, this paper attempts to put forward a new hypothesis: quasi-alliance. Based on an empirical study of Syria-Iran special relations in the past four decades, it reveals that quasi-alliance is a unique model for security cooperation in international arena paralleling with formal alliance, and its security arrangement has an unique logic, dynamics, mode of management and attributes. In the new framework of analysis, this paper touches down upon the origins, channels, features and tests of Syria-Iran quasi-alliance by focusing on the diplomatic history of their bilateral relations from 1979 to 2017. The bilateral quasi-alliance practice has undergone three stages of combating Iraqi aggression in 1980s, curbing Israel-Turkey axis in 1990s and balancing U.S.-Israel-Saudi-Turkey coalition in the 21st century, particularly since the outbreak of the Syrian civil war.展开更多
文摘The quasi-alliance strategy is part of the national security strategy and lies in the grey area between alliance and neutrality.1 In recent years,major countries,including Japan,have positioned quasi-alliance as a feasible unwritten option in their respective national security strategies.2 Japan’s quasialliance strategy was already in its infancy when former Japanese Prime Minister Shinzo Abe first came to power in September 2006 but was put on hold after his resignation in September 2007.
文摘Blockchain,known for its secure encrypted ledger,has garnered attention in financial and data transfer realms,including the field of energy trading.However,the decentralized nature and identity anonymity of user nodes raise uncertainties in energy transactions.The broadcast consensus authentication slows transaction speeds,and frequent single-point transactions in multi-node settings pose key exposure risks without protective measures during user signing.To address these,an alliance blockchain scheme is proposed,reducing the resource-intensive identity verification among nodes.It integrates multi-signature functionality to fortify user resources and transac-tion security.A novel multi-signature process within this framework involves neutral nodes established through central nodes.These neutral nodes participate in multi-signature’s signing and verification,ensuring user identity and transaction content privacy.Reducing interactions among user nodes enhances transaction efficiency by minimizing communication overhead during verification and consensus stages.Rigorous assessments on reliability and operational speed highlight superior security performance,resilient against conventional attack vectors.Simulation shows that compared to traditional solutions,this scheme has advantages in terms of running speed.In conclusion,the alliance blockchain framework introduces a novel approach to tackle blockchain’s limitations in energy transactions.The integrated multi-signature process,involving neutral nodes,significantly enhances security and privacy.The scheme’s efficiency,validated through analytical assessments and simulations,indicates robustness against security threats and improved transactional speeds.This research underscores the potential for improved security and efficiency in blockchain-enabled energy trading systems.
基金This work was supported by the Humanities and Social Science Fund of Ministry of Education of China(No.20YJA630009)Shandong Natural Science Foundation of China(No.ZR2022MG002).
文摘This study delves into the formation dynamics of alliances within a closed-loop supply chain(CLSC)that encom-passes a manufacturer,a retailer,and an e-commerce platform.It leverages Stackelberg game for this exploration,contrasting the equilibrium outcomes of a non-alliance model with those of three differentiated alliance models.The non-alliance model acts as a crucial benchmark,enabling the evaluation of the motivations for various supply chain entities to engage in alliance formations.Our analysis is centered on identifying the most effective alliance strategies and establishing a coordination within these partnerships.We thoroughly investigate the consequences of diverse alliance behaviors,bidirectional free-riding and cost-sharing,and the resultant effects on the optimal decision-making among supply chain actors.The findings underscore several pivotal insights:(1)The behavior of alliances within the supply chain exerts variable impacts on the optimal pricing and demand of its members.In comparison to the non-alliance(D)model,the manufacturer-retailer(MR)and manufacturer-e-commerce platform(ME)alliances significantly lower both offline and online resale prices for new and remanufactured goods.This adjustment leads to an enhanced demand for products via the MR alliance’s offline outlets and the ME alliance’s online platforms,thereby augmenting the profits for those within the alliance.Conversely,retailer-e-commerce platform(ER)alliance tends to increase the optimal retail price and demand across both online and offline channels.Under specific conditions,alliance behavior can also increase the profits of non-alliance members,and the profits derived through alliance channels also exceed those from non-alliance channels.(2)The prevalence of bidirectional free-riding behavior largely remains constant across different alliance configurations.Across these models,bidirectional free-riding typically elevates the equilibrium prices in offline channel while negatively affecting the equilibrium prices in other channel.(3)The effect of cost-sharing shows relative uniformity across the various alliance models.Across all configurations,cost-sharing tends to reduce the manufacturer’s profits.Nonetheless,alliances initiated by the manufacturer can counteract these negative impacts,providing a strategic pathway to bolster CLSC profitability.
文摘Building a technology alliance is the main strategy for the United States to maintain its scientific and technological hegemony under its technopolitical strategic framework.After Joe Biden took office,the United States implemented“small yard with high fences”strategy for scientific and technological competition,as the first step toward building a technology alliance.The main goal is to restrict the flow of strategic emerging technologies and factors of innovation to rival countries.
基金supported by the Guangxi Science and Technology Major Special Project (Project Number GUIKEAA22067079-1).
文摘With the development of renewable energy technologies such as photovoltaics and wind power,it has become a research hotspot to improve the consumption rate of new energy and reduce energy costs through the deployment of energy storage.To solve the problem of the interests of different subjects in the operation of the energy storage power stations(ESS)and the integrated energy multi-microgrid alliance(IEMA),this paper proposes the optimization operation method of the energy storage power station and the IEMA based on the Stackelberg game.In the upper layer,ESS optimizes charging and discharging decisions through a dynamic pricing mechanism.In the lower layer,IEMA optimizes the output of various energy conversion coupled devices within the IEMA,as well as energy interaction and demand response(DR),based on the energy interaction prices provided by ESS.The results demonstrate that the optimization strategy proposed in this paper not only effectively balances the benefits of the IEMA and ESS but also enhances energy consumption rates and reduces IEMA energy costs.
文摘Themed"Digital Education:Application,Sharing,and Innovation",the 2024 World Digital Education Conference opened in Shanghai on January 3Oth.Secretary of CPC Shanghai Municipal Committee Chen Jining,Vice-Chairperson of the Standing Committee of the National People's Congress of China Cai Dafeng,and President of the 42nd session of the UNESCO General Conference Simona-Mirela Miculescu attended the opening ceremony and delivered speeches.
文摘To implement the National Standardization Development Outline and Hubei’s relevant supporting policies,the launching ceremony of Hubei Association Standardization Development Alliance was held in Wuhan,Hubei province on June 28,which was hosted by Hubei Institute of Standardization and Quality,and jointly held by Optics Valley of China and Hubei Optics Valley Standard Innovate Technology Co.,Ltd.The alliance was initiated by 94 units in Hubei,including research institutions,enterprises,industrial associations,and universities.The ceremony was attended by Yu Xinli,President of China Association for Standardization,Pan Niansong,Director-General of Hubei Medical Products Administration,Xu Qinxiang,Head of Standardization Division of Hubei Administration for Market Regulation,and representatives from members of the alliance.
文摘After the Cold War and especially since the Justice and Development Party administration led by Erdogan,the US-Turkey alliance relations have declined.The two countries have sharp structural contradictions on a series of issues.Due to the profound geopolitical landscape changes,the interdependence on security and defense between the United States and Turkey has been severely weakened,leading to significant divergence in threat definition and pursuit of interests.Turkey has continuously enhanced its diplomatic autonomy,seeking to change its weak position in the original alliance relations,and striving to become a regional leader.These structural contradictions inevitably trigger the hedging of policies and interests between the United States and Turkey.
文摘I am very pleased and privileged to be addressing the thematic segment of the Third Belt and Road Forum for the second time.I am also delighted to be back to Beijing in less than 3 months.My latest visit was in last July at the invitation of the Chinese Association for International Understanding.
文摘BASED on the Belt and Road Initiative(BRI)proposed by Chinese President Xi Jinping in 2013,the Belt and Road Film Festival Alliance and the Belt and Road Film Week were founded at the 21st Shanghai International Film Festival(SIFF)in June 2018.In the past five years membership of the alliance has grown from 31 film institutions in 29 countries to 55 institutions in 48 countries.
文摘On September 1,2023,a launch ceremony for the International Tourism Alliance of Silk Road Cities was held in Jingdezhen,Jiangxi Province,along with a series of other activities,including the“International Forum on Culture and Tourism Development of Silk Road Cities”2023,and the“Charming Silk Road,Connecting the World-Silk Road Tourism Cities Joint Promotion Exhibition”.
文摘2023 World Tourism Alliance(WTA)·Xianghu Dialogue,focusing on cooperation,transformation,co-creation,sharing,empowerment,and gathering momentum,aims to explore the potential of tourism in connecting the world,boosting economies,fostering innovation,promoting industry integration,and accelerating sustainable high-quality development.
基金Project supported by the Key-Area Research and Development Program of Guangdong Province,China (Grant No.2021B0101260001)Guangdong Basic and Applied Basic Research Foundation (Grant No.2019A1515110411)the National Natural Science Foundation of China (Grant No.61904201)。
文摘Silicon passivated emitter and rear contact(PERC) solar cells with V-groove texture were fabricated using maskless alkaline solution etching with in-house developed additive. Compared with the traditional pyramid texture, the V-groove texture possesses superior effective minority carrier lifetime, enhanced p–n junction quality and better applied filling factor(FF). In addition, a V-groove texture can greatly reduce the shading area and edge damage of front Ag electrodes when the V-groove direction is parallel to the gridline electrodes. Due to these factors, the V-groove solar cells have a higher efficiency(21.78%) than pyramid solar cells(21.62%). Interestingly, external quantum efficiency(EQE) and reflectance of the V-groove solar cells exhibit a slight decrease when the incident light angle(θ) is increased from 0° to 75°, which confirms the excellent quasi omnidirectionality of the V-groove solar cells. The proposed V-groove solar cell design shows a 2.84% relative enhancement of energy output over traditional pyramid solar cells.
基金Project supported by the National Natural Science Foundation of China (Grant No.61973167)the Jiangsu Funding Program for Excellent Postdoctoral Talent。
文摘Continuum robots with high flexibility and compliance have the capability to operate in confined and cluttered environments. To enhance the load capacity while maintaining robot dexterity, we propose a novel non-constant subsegment stiffness structure for tendon-driven quasi continuum robots(TDQCRs) comprising rigid-flexible coupling subsegments.Aiming at real-time control applications, we present a novel static-to-kinematic modeling approach to gain a comprehensive understanding of the TDQCR model. The analytical subsegment-based kinematics for the multisection manipulator is derived based on screw theory and product of exponentials formula, and the static model considering gravity loading,actuation loading, and robot constitutive laws is established. Additionally, the effect of tension attenuation caused by routing channel friction is considered in the robot statics, resulting in improved model accuracy. The root-mean-square error between the outputs of the static model and the experimental system is less than 1.63% of the arm length(0.5 m). By employing the proposed static model, a mapping of bending angles between the configuration space and the subsegment space is established. Furthermore, motion control experiments are conducted on our TDQCR system, and the results demonstrate the effectiveness of the static-to-kinematic model.
文摘In a paper conceived about five years ago(“Globalization and Public Goods:Too Big to Tackle?”)roughly a dozen factors were linked to explain important causal paths from globalization to the potential output of public goods.The Russian invasion of Ukraine,the corona epidemic,and the increased hegemonic rivalry between China and the U.S.interrupted or even destroyed many of the linkages between globalization and potential public good production.About five important detrimental paths involved in the meantime.In the present article we aim at linking what is left from the previous level of globalization or emerging to form a new and simplified causal model for likely linkages between truncated or(re-)emerging globalization,and the deadly needed output of public goods.These linkages refer to rules of climate control,go to trade linkages and arbitrary tariffs and trade interventions.Regime change,regime formation,and alliance restructuring address aspects of domestic rule and international stability.Selectorate theory,regime type,and exit options for political elites provide key explanatory factors in explaining globalization and public goods productions,or their decay.Where possible we use some data and transformation experiences corroborating our arguments.In other instances need for further empirical macro research will become clear.
基金the financial support by the Council of Scientific&Industrial Research(CSIR)-Research Scheme,India(22/0809/2019-EMR-II)。
文摘Damage caused due to low-velocity impacts in composites leads to substantial deterioration in their residual strength and eventually provokes structural failure.This work presents an experimental investigation on the effects of different patch and parent laminate stacking sequences on the enhancement of impact strength of Carbon Fiber Reinforced Polymers(CFRP)composites by utilising the adhesively bonded external patch repair technique.Damage evolution study is also performed with the aid of Acoustic Emission(AE).Two different quasi-isotropic configurations were selected for the parent laminate,viz.,[45°/45°/0°/0°]s and[45°/0°/45°/0°]s.Quasi Static Indentation(QSI)test was performed on both the pristine laminates,and damage areas were detected by using the C-scan inspection technique.Damaged laminates were repaired by using a single-sided patch of two different configurations,viz.,[45°/45°/45°/45°]and[45°/0°/0°/45°],and employing a circular plug to fill the damaged hole.Four different combinations of repaired laminates with two configurations of each parent and patch laminate were produced,which were further subjected to the QSI test.The results reveal the effectiveness of the repair method,as all the repaired laminates show higher impact resistance compared to the respective pristine laminates.Patches of[45°/0°/0°/45°]configuration when repaired by taking[45°/45°/0°/0°]s and[45°/0°/45°/0°]s as parents exhibited 68%and 73%higher peak loads,respectively,than the respective pristine laminates.Furthermore,parent and patch of configuration[45°/0°/45°/0°]s and[45°/0°/0°/45°],respectively,attain the highest peak load,whereas[45°/45°/0°/0°]s and[45°/45°/45°/45°]combinations possess the most gradual decrease in the load.
文摘Syria and Iran have formed a special relation in the past four decades. While researchers of international relations have probed deeply into alliance theory in the past half century, current literature in this field can hardly explain the informal mechanism for Syria-Iran security cooperation. To unravel the puzzle, this paper attempts to put forward a new hypothesis: quasi-alliance. Based on an empirical study of Syria-Iran special relations in the past four decades, it reveals that quasi-alliance is a unique model for security cooperation in international arena paralleling with formal alliance, and its security arrangement has an unique logic, dynamics, mode of management and attributes. In the new framework of analysis, this paper touches down upon the origins, channels, features and tests of Syria-Iran quasi-alliance by focusing on the diplomatic history of their bilateral relations from 1979 to 2017. The bilateral quasi-alliance practice has undergone three stages of combating Iraqi aggression in 1980s, curbing Israel-Turkey axis in 1990s and balancing U.S.-Israel-Saudi-Turkey coalition in the 21st century, particularly since the outbreak of the Syrian civil war.