“China will fight to the end if the United States continues to escalate trade frictions,”the Ministry of Commerce(MOC)said recently.China will not give ground on issues of principle during bilateral economic and tra...“China will fight to the end if the United States continues to escalate trade frictions,”the Ministry of Commerce(MOC)said recently.China will not give ground on issues of principle during bilateral economic and trade talks,which are clearly stated in a white paper on bilateral trade consultations issued earlier this month,MOC spokesperson Gao Feng said.In response to the new threat of tarrifs by the United States,Gao said China is firmly against US unilateralism and bullying.展开更多
Wang Jinhua,a teacher and delegate to the19th CPC National Congress,lectures her rural students on law and morals in Hainan in November.She was selected as a delegate because of her creative style and dedication to ch...Wang Jinhua,a teacher and delegate to the19th CPC National Congress,lectures her rural students on law and morals in Hainan in November.She was selected as a delegate because of her creative style and dedication to children.Rowing boats for her students was the most memorable thing of her 38 years of teaching,said Wang Jinhua,a mountain schoolteacher on western Hainan island.展开更多
A new railway design is allowing the latest highspeed rail line to pass through national natural reserves while causing only minor disturbance to local wildlife.The Xi’an-Chengdu high-speed rail,which opened on Wedne...A new railway design is allowing the latest highspeed rail line to pass through national natural reserves while causing only minor disturbance to local wildlife.The Xi’an-Chengdu high-speed rail,which opened on Wednesday,is the first bullet train to cut though the Qinling Mountains,in Shanxi province,which are home to many rare wild animals including the giant panda,golden monkey,crested ibis and golden takin.展开更多
Currently,the International Maritime Organization(IMO)has approved and implemented the assessment requirement for Minimum Propulsion Power(MPP)of ships in adverse sea conditions.The assessment method and relevant infl...Currently,the International Maritime Organization(IMO)has approved and implemented the assessment requirement for Minimum Propulsion Power(MPP)of ships in adverse sea conditions.The assessment method and relevant influence factors will have a vital impact on ship's design and operation.On the other hand,MPP is essentially a criterion for manoeuvring safety at actual seas.However,the practical assessment methods adopted in IMO guidelines do not directly and accurately account for ship's coursekeeping ability in severe seas.A time-domain comprehensive method with supplementary course-keeping ability criteria has been proposed in the authors'preliminary research.Based on an updated mathematical model and criteria,this paper presents more detailed elaborations,results and discussions on the time-domain method,including the comparative analyses with a power line method and two steady-state equilibrium methods based on IMO guidelines and draft.Discussions on the influences of key factors,involving criterion conditions and calculation parameters,are also presented.The results indicate that different methods exhibit varying advantages and complexity in MPP assessment,thus constituting a multi-level assessment framework for MPP.In particular,the time-domain comprehensive assessment has a higher accuracy with more realistic description of manoeuvre behaviors,capable of offering a solution for the ships that cannot meet other assessments,or for the assessment requiring additional course-keeping ability.Furthermore,an expanded range of wave direction sets a stricter but potentially necessary requirement,while using the self-propulsion factors at low speeds can eliminate the unnecessary conservation of assessment result caused by those at design speed.展开更多
Coming together is a beginning,keeping together is progress,and working together is success.The theory is almost applicable to any area,and the standardization community is no exception.The State Council issued the Op...Coming together is a beginning,keeping together is progress,and working together is success.The theory is almost applicable to any area,and the standardization community is no exception.The State Council issued the Opinions on Accelerating the Construction of Unified National Market in March 2022,which has become an important national strategy since then.展开更多
Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and pra...Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.展开更多
This paper addresses the lane-keeping control problem for autonomous ground vehicles subject to input saturation and uncertain system parameters.An enhanced adaptive terminal sliding mode based prescribed performance ...This paper addresses the lane-keeping control problem for autonomous ground vehicles subject to input saturation and uncertain system parameters.An enhanced adaptive terminal sliding mode based prescribed performance control scheme is proposed,which enables the lateral position error of the vehicle to be kept within the prescribed performance boundaries all the time.This is achieved by firstly introducing an improved performance function into the controller design such that the stringent initial condition requirements can be relaxed,which further allows the global prescribed performance control result,and then,developing a multivariable adaptive terminal sliding mode based controller such that both input saturation and parameter uncertainties are handled effectively,which further ensures the robust lane-keeping control.Finally,the proposed control strategy is validated through numerical simulations,demonstrating its effectiveness.展开更多
The city maintains a low-key ambience for the World Expo For a city about to receive an estimated 70 million visitors, Shanghai is remarkably composed as it nears the opening of the World Expo. Walking along the Bund ...The city maintains a low-key ambience for the World Expo For a city about to receive an estimated 70 million visitors, Shanghai is remarkably composed as it nears the opening of the World Expo. Walking along the Bund and strolling through the former French Concession on a Saturday afternoon in spring, it would be easy for a foreign visitor not to realize what is going on. There are notices in展开更多
本文最吸引读者、最值得回味的是标题。其含义和主题句一致,彼此呼应。但是,标题更简洁、更精彩,它是一句具有拟人色彩的非人称主语句(ImpersonalSubject Sentence)。标题是否可译为:防晒露将人们置于“毒日”之下！ 防晒霜的作用本来是...本文最吸引读者、最值得回味的是标题。其含义和主题句一致,彼此呼应。但是,标题更简洁、更精彩,它是一句具有拟人色彩的非人称主语句(ImpersonalSubject Sentence)。标题是否可译为:防晒露将人们置于“毒日”之下！ 防晒霜的作用本来是 shield people from the sun’s burning rays。 然而,为什么 people who use sunscreen have higher rates of skin cancer andalso develop more moles(痣). which can become cancerous(致癌的)? 值得好好研究！原来,原因之一是防晒霜使用者的微妙的心理在起作用: …people feel a false sense of security when they use sunscreen. 另一个原因是:本来只能使用4次的一瓶防晒霜,不少人却使用了整整一个夏季。自然, 防晒霜就没有能够发挥其作用。为此,作者出语诙谐: Sunscreen should be something on your weekly or monthly grocery list. 文章的末句是: People should be warned to avoid the sun,period, and told sunscreen is foruse when they have to be out,she added. 其中出现的period不是名词,而是感叹词。它常用于美国口语,意思是:就是这么回事。用于叙述事实或看法后表示强调。另如: I could have prevented them,and I didn’t.Period. 我本可以拦住?展开更多
正常的、经常的性生活有养颜之功效,这就是本文的主题。这是一个叫David Weeks的神经心理学家10年的研究成果。10年间,他调查的对象达3500人,年龄从18岁到102岁,地域从欧洲到美国。但是,本文所以能被我们接受,其中一个重要原因是,文章...正常的、经常的性生活有养颜之功效,这就是本文的主题。这是一个叫David Weeks的神经心理学家10年的研究成果。10年间,他调查的对象达3500人,年龄从18岁到102岁,地域从欧洲到美国。但是,本文所以能被我们接受,其中一个重要原因是,文章还强调了下面两点: 1.The 10-year study also suggests that people who look younger than theiryears are more altruistie(利他的,无私心的),confident and better educated. 2.His study found that promiscuous(乱七八糟的)sex did not have the samebenefits as regular sex in a long-term relationship.展开更多
"THE power in our hands is given to us by the people, so we should only serve them with it," says Yang Huifang. She has been in the post of vice mayor of Yuncheng, Shanxi Province, for seven years. With the ..."THE power in our hands is given to us by the people, so we should only serve them with it," says Yang Huifang. She has been in the post of vice mayor of Yuncheng, Shanxi Province, for seven years. With the idea of serving the people at the heart of her ambitions, Yang Huifang has won respect and support from the 530,000 people living in Yuncheng. Open-minded and forward-thinking, Yang is bold and resolute in her work. During her long tenure in town administration she accunmlated rich experience in planning, culture,展开更多
我是一个退休教师,步入老境后,因体质原本较弱,加上深居简出,双腿的肌肉开始萎缩。行动不便,苦不堪言。随着老境的到来,哺乳动物的一个显著变化是:During the aging process,mammals lose up to a third of their skeletalmuscle mass a...我是一个退休教师,步入老境后,因体质原本较弱,加上深居简出,双腿的肌肉开始萎缩。行动不便,苦不堪言。随着老境的到来,哺乳动物的一个显著变化是:During the aging process,mammals lose up to a third of their skeletalmuscle mass and strength.今天,我从因特网上读到一篇文章,非常兴奋。一种基 因疗法(gene therapy)在老鼠身上的实验已经获得成功,这种疗法能减缓衰老:itmay be possible to preserve muscle size and strength in old age using thisapproach.将这种基因注入人体的方法耐人寻味。基因疗法的前景非常诱人:Thebeneficial effects of this gene therapy could easily be used by humans for athleticor even cosmetic enhancements.到了下世纪的中叶,也许,人的外貌将具有极大的迷惑性,人之外貌将很难成为人的年龄的“凭证”！虽然,我活不到那个时候,但是,想到未来科学的进展,我的心头仍洋溢着快慰和欣喜。】展开更多
Regarding the lane keeping system,path tracking accuracy and lateral stability at high speeds need to be taken into account especially for commercial vehicles due to the characteristics of larger mass,longer wheelbase...Regarding the lane keeping system,path tracking accuracy and lateral stability at high speeds need to be taken into account especially for commercial vehicles due to the characteristics of larger mass,longer wheelbase and higher mass center.To improve the performance mentioned above comprehensively,the control strategy based on improved artificial potential field(APF)algorithm is proposed.In the paper,time to lane crossing(TLC)is introduced into the potential field function to enhance the accuracy of path tracking,meanwhile the vehicle dynamics parameters including yaw rate and lateral acceleration are chosen as the repulsive force field source.The lane keeping controller based on improved APF algorithm is designed and the stability of the control system is proved based on Lyapunov theory.In addition,adaptive inertial weight particle swarm optimization algorithm(AIWPSO)is applied to optimize the gain of each potential field function.The co-simulation results indicate that the comprehensive evaluation index respecting lane tracking accuracy and lateral stability is reduced remarkably.Finally,the proposed control strategy is verified by the HiL test.It provides a beneficial reference for dynamics control of commercial vehicles and enriches the theoretical development and practical application of artificial potential field method in the field of intelligent driving.展开更多
Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest develop-ments and achievements in both theoretical and pr...Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest develop-ments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.The journal welcomes high quality original papers from a wide range of countries.展开更多
文摘“China will fight to the end if the United States continues to escalate trade frictions,”the Ministry of Commerce(MOC)said recently.China will not give ground on issues of principle during bilateral economic and trade talks,which are clearly stated in a white paper on bilateral trade consultations issued earlier this month,MOC spokesperson Gao Feng said.In response to the new threat of tarrifs by the United States,Gao said China is firmly against US unilateralism and bullying.
文摘Wang Jinhua,a teacher and delegate to the19th CPC National Congress,lectures her rural students on law and morals in Hainan in November.She was selected as a delegate because of her creative style and dedication to children.Rowing boats for her students was the most memorable thing of her 38 years of teaching,said Wang Jinhua,a mountain schoolteacher on western Hainan island.
文摘A new railway design is allowing the latest highspeed rail line to pass through national natural reserves while causing only minor disturbance to local wildlife.The Xi’an-Chengdu high-speed rail,which opened on Wednesday,is the first bullet train to cut though the Qinling Mountains,in Shanxi province,which are home to many rare wild animals including the giant panda,golden monkey,crested ibis and golden takin.
文摘Currently,the International Maritime Organization(IMO)has approved and implemented the assessment requirement for Minimum Propulsion Power(MPP)of ships in adverse sea conditions.The assessment method and relevant influence factors will have a vital impact on ship's design and operation.On the other hand,MPP is essentially a criterion for manoeuvring safety at actual seas.However,the practical assessment methods adopted in IMO guidelines do not directly and accurately account for ship's coursekeeping ability in severe seas.A time-domain comprehensive method with supplementary course-keeping ability criteria has been proposed in the authors'preliminary research.Based on an updated mathematical model and criteria,this paper presents more detailed elaborations,results and discussions on the time-domain method,including the comparative analyses with a power line method and two steady-state equilibrium methods based on IMO guidelines and draft.Discussions on the influences of key factors,involving criterion conditions and calculation parameters,are also presented.The results indicate that different methods exhibit varying advantages and complexity in MPP assessment,thus constituting a multi-level assessment framework for MPP.In particular,the time-domain comprehensive assessment has a higher accuracy with more realistic description of manoeuvre behaviors,capable of offering a solution for the ships that cannot meet other assessments,or for the assessment requiring additional course-keeping ability.Furthermore,an expanded range of wave direction sets a stricter but potentially necessary requirement,while using the self-propulsion factors at low speeds can eliminate the unnecessary conservation of assessment result caused by those at design speed.
文摘Coming together is a beginning,keeping together is progress,and working together is success.The theory is almost applicable to any area,and the standardization community is no exception.The State Council issued the Opinions on Accelerating the Construction of Unified National Market in March 2022,which has become an important national strategy since then.
文摘Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest developments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.
基金supported in part by the National Key Research and Development Program of China under Grant 2023YFA1011803in part by Natural Science Foundation of Chongqing,China under Grant CSTB2023NSCQ-MSX0588+2 种基金in part by the Fundamental Research Funds for the Central Universities,China under Grant 2023CDJKYJH047in part by the National Natural Science Foundation of China under Grant 62273064,Grant 61991400,Grant 61991403,Grant 61933012,Grant 62250710167,Grant 62203078in part by Innovation Support Program for International Students Returning to China under Grant cx2022016.
文摘This paper addresses the lane-keeping control problem for autonomous ground vehicles subject to input saturation and uncertain system parameters.An enhanced adaptive terminal sliding mode based prescribed performance control scheme is proposed,which enables the lateral position error of the vehicle to be kept within the prescribed performance boundaries all the time.This is achieved by firstly introducing an improved performance function into the controller design such that the stringent initial condition requirements can be relaxed,which further allows the global prescribed performance control result,and then,developing a multivariable adaptive terminal sliding mode based controller such that both input saturation and parameter uncertainties are handled effectively,which further ensures the robust lane-keeping control.Finally,the proposed control strategy is validated through numerical simulations,demonstrating its effectiveness.
文摘The city maintains a low-key ambience for the World Expo For a city about to receive an estimated 70 million visitors, Shanghai is remarkably composed as it nears the opening of the World Expo. Walking along the Bund and strolling through the former French Concession on a Saturday afternoon in spring, it would be easy for a foreign visitor not to realize what is going on. There are notices in
文摘本文最吸引读者、最值得回味的是标题。其含义和主题句一致,彼此呼应。但是,标题更简洁、更精彩,它是一句具有拟人色彩的非人称主语句(ImpersonalSubject Sentence)。标题是否可译为:防晒露将人们置于“毒日”之下！ 防晒霜的作用本来是 shield people from the sun’s burning rays。 然而,为什么 people who use sunscreen have higher rates of skin cancer andalso develop more moles(痣). which can become cancerous(致癌的)? 值得好好研究！原来,原因之一是防晒霜使用者的微妙的心理在起作用: …people feel a false sense of security when they use sunscreen. 另一个原因是:本来只能使用4次的一瓶防晒霜,不少人却使用了整整一个夏季。自然, 防晒霜就没有能够发挥其作用。为此,作者出语诙谐: Sunscreen should be something on your weekly or monthly grocery list. 文章的末句是: People should be warned to avoid the sun,period, and told sunscreen is foruse when they have to be out,she added. 其中出现的period不是名词,而是感叹词。它常用于美国口语,意思是:就是这么回事。用于叙述事实或看法后表示强调。另如: I could have prevented them,and I didn’t.Period. 我本可以拦住?
文摘正常的、经常的性生活有养颜之功效,这就是本文的主题。这是一个叫David Weeks的神经心理学家10年的研究成果。10年间,他调查的对象达3500人,年龄从18岁到102岁,地域从欧洲到美国。但是,本文所以能被我们接受,其中一个重要原因是,文章还强调了下面两点: 1.The 10-year study also suggests that people who look younger than theiryears are more altruistie(利他的,无私心的),confident and better educated. 2.His study found that promiscuous(乱七八糟的)sex did not have the samebenefits as regular sex in a long-term relationship.
文摘"THE power in our hands is given to us by the people, so we should only serve them with it," says Yang Huifang. She has been in the post of vice mayor of Yuncheng, Shanxi Province, for seven years. With the idea of serving the people at the heart of her ambitions, Yang Huifang has won respect and support from the 530,000 people living in Yuncheng. Open-minded and forward-thinking, Yang is bold and resolute in her work. During her long tenure in town administration she accunmlated rich experience in planning, culture,
文摘我是一个退休教师,步入老境后,因体质原本较弱,加上深居简出,双腿的肌肉开始萎缩。行动不便,苦不堪言。随着老境的到来,哺乳动物的一个显著变化是:During the aging process,mammals lose up to a third of their skeletalmuscle mass and strength.今天,我从因特网上读到一篇文章,非常兴奋。一种基 因疗法(gene therapy)在老鼠身上的实验已经获得成功,这种疗法能减缓衰老:itmay be possible to preserve muscle size and strength in old age using thisapproach.将这种基因注入人体的方法耐人寻味。基因疗法的前景非常诱人:Thebeneficial effects of this gene therapy could easily be used by humans for athleticor even cosmetic enhancements.到了下世纪的中叶,也许,人的外貌将具有极大的迷惑性,人之外貌将很难成为人的年龄的“凭证”！虽然,我活不到那个时候,但是,想到未来科学的进展,我的心头仍洋溢着快慰和欣喜。】
基金Supported by National Natural Science Foundation of China(Grant Nos.51605199,U20A20333,52225212)Six Talent Peak Funding Projects in Jiangsu Province of China(Grant No.2019-GDZB-084)Key Science and Technology Support Program in Taizhou City of China(Grant No.TG202307).
文摘Regarding the lane keeping system,path tracking accuracy and lateral stability at high speeds need to be taken into account especially for commercial vehicles due to the characteristics of larger mass,longer wheelbase and higher mass center.To improve the performance mentioned above comprehensively,the control strategy based on improved artificial potential field(APF)algorithm is proposed.In the paper,time to lane crossing(TLC)is introduced into the potential field function to enhance the accuracy of path tracking,meanwhile the vehicle dynamics parameters including yaw rate and lateral acceleration are chosen as the repulsive force field source.The lane keeping controller based on improved APF algorithm is designed and the stability of the control system is proved based on Lyapunov theory.In addition,adaptive inertial weight particle swarm optimization algorithm(AIWPSO)is applied to optimize the gain of each potential field function.The co-simulation results indicate that the comprehensive evaluation index respecting lane tracking accuracy and lateral stability is reduced remarkably.Finally,the proposed control strategy is verified by the HiL test.It provides a beneficial reference for dynamics control of commercial vehicles and enriches the theoretical development and practical application of artificial potential field method in the field of intelligent driving.
文摘Aims and scope Journal of Systems Engineering and Electronics,keeping abreast with the development trend of science and technology worldwide,reports the latest develop-ments and achievements in both theoretical and practical aspects of systems engineering,electronics and related research areas.The journal welcomes high quality original papers from a wide range of countries.
