The impact dynamics, impact effect, and post-impact unstable motion sup- pression of free-floating space manipulator capturing a satellite on orbit are analyzed. Firstly, the dynamics equation of free-floating space m...The impact dynamics, impact effect, and post-impact unstable motion sup- pression of free-floating space manipulator capturing a satellite on orbit are analyzed. Firstly, the dynamics equation of free-floating space manipulator is derived using the sec- ond Lagrangian equation. Combining the momentum conservation principle, the impact dynamics and effect between the space manipulator end-effector and satellite of the cap- ture process are analyzed with the momentum impulse method. Focusing on the unstable motion of space manipulator due to the above impact effect, a robust adaptive compound control algorithm is designed to suppress the above unstable motion. There is no need to control the free-floating base position to save the jet fuel. Finally, the simulation is proposed to show the impact effect and verify the validity of the control algorithm.展开更多
Human life without environment is not at all possible,recent years due to huge urbanization and rise in technology affecting the health in a worst manner,ultimately we are only the responsible,Objectives:This article ...Human life without environment is not at all possible,recent years due to huge urbanization and rise in technology affecting the health in a worst manner,ultimately we are only the responsible,Objectives:This article focuses to create awareness regarding environmental health problems.This article focuses on the issues,information to environmental health problems including sources of toxicants.The resources for nurses to prevent,minimize,to treat adverse environmental exposures.To draw attention of NGOs and Govt.There are many report(TOI)says that 70%of Indians doesn’t breathe fresh air due to air pollution and not able to get safe drinking/adequate water its due to water pollution and major cause for this is huge increase in population,fastest growing urbanization.Heavy pollution occurred such air,water,food and huge chemicals using for growing crops also the main reason to reduce life-span as well as increase the risk of developing diseases.The nurse plays a pivotal role in prevention of environmental related risk and illness by continuous touch with the community peoples.The Nurse plays a pivotal role in prevention of health problems with regard to environment,primarily should have thorough knowledge about environmental impact in health and prevent.Nurse is foremost person who will assist in screening,diagnosis and alleviating health symptoms at the all the levels of health care.展开更多
Construction projects are among the riskiest projects, which require the application of the right rules and to abide by the proper safety standards. Thus, this study aims to study the impact of COVID-19 on the constru...Construction projects are among the riskiest projects, which require the application of the right rules and to abide by the proper safety standards. Thus, this study aims to study the impact of COVID-19 on the construction and engineering companies due to the Corona pandemic in the Gaza Strip, and introducing the means used in dealing with this pandemic and how to avoid, limit and deal with it. And to shed light on the most important obstacles and challenges facing the construction sector in the light of the outbreak of the epidemic. To achieve this, a cross-sectional study based on an online questionnaire was conducted by Google Forms. Then, the data collected was analyzed using the thematic analysis approach. The results show that best procedures to mitigate the impact of this epidemic and to prioritize the safety and health of employees in contracting and engineering companies, to provide a safe work environment and developing plans to confront the spread of injury in the work-environment. The study recommends that government may provide financial support to companies and reduce taxes imposed on them in order to be able to confront this pandemic.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11072061 and 11372073)the Natural Science Foundation of Fujian Province(No.2010J01003)
文摘The impact dynamics, impact effect, and post-impact unstable motion sup- pression of free-floating space manipulator capturing a satellite on orbit are analyzed. Firstly, the dynamics equation of free-floating space manipulator is derived using the sec- ond Lagrangian equation. Combining the momentum conservation principle, the impact dynamics and effect between the space manipulator end-effector and satellite of the cap- ture process are analyzed with the momentum impulse method. Focusing on the unstable motion of space manipulator due to the above impact effect, a robust adaptive compound control algorithm is designed to suppress the above unstable motion. There is no need to control the free-floating base position to save the jet fuel. Finally, the simulation is proposed to show the impact effect and verify the validity of the control algorithm.
文摘Human life without environment is not at all possible,recent years due to huge urbanization and rise in technology affecting the health in a worst manner,ultimately we are only the responsible,Objectives:This article focuses to create awareness regarding environmental health problems.This article focuses on the issues,information to environmental health problems including sources of toxicants.The resources for nurses to prevent,minimize,to treat adverse environmental exposures.To draw attention of NGOs and Govt.There are many report(TOI)says that 70%of Indians doesn’t breathe fresh air due to air pollution and not able to get safe drinking/adequate water its due to water pollution and major cause for this is huge increase in population,fastest growing urbanization.Heavy pollution occurred such air,water,food and huge chemicals using for growing crops also the main reason to reduce life-span as well as increase the risk of developing diseases.The nurse plays a pivotal role in prevention of environmental related risk and illness by continuous touch with the community peoples.The Nurse plays a pivotal role in prevention of health problems with regard to environment,primarily should have thorough knowledge about environmental impact in health and prevent.Nurse is foremost person who will assist in screening,diagnosis and alleviating health symptoms at the all the levels of health care.
文摘Construction projects are among the riskiest projects, which require the application of the right rules and to abide by the proper safety standards. Thus, this study aims to study the impact of COVID-19 on the construction and engineering companies due to the Corona pandemic in the Gaza Strip, and introducing the means used in dealing with this pandemic and how to avoid, limit and deal with it. And to shed light on the most important obstacles and challenges facing the construction sector in the light of the outbreak of the epidemic. To achieve this, a cross-sectional study based on an online questionnaire was conducted by Google Forms. Then, the data collected was analyzed using the thematic analysis approach. The results show that best procedures to mitigate the impact of this epidemic and to prioritize the safety and health of employees in contracting and engineering companies, to provide a safe work environment and developing plans to confront the spread of injury in the work-environment. The study recommends that government may provide financial support to companies and reduce taxes imposed on them in order to be able to confront this pandemic.
