In this note, we design a velocity-altitude map for hypersonic level flight in near space of altitude 20-100 km. This map displays aerodynamic-related parameters associated with near space level flight, schematically ...In this note, we design a velocity-altitude map for hypersonic level flight in near space of altitude 20-100 km. This map displays aerodynamic-related parameters associated with near space level flight, schematically or quantitatively. Various physical conditions for the near-space level flight are then characterized, including laminar or turbulent flow, rarefaction or continuous flow, aerodynamic heating, as well as conditions for sustaining level flight with and without orbital effect. This map allows one to identify conditions to have soft flight or hard flight, and this identification would be helpful for making correct planning on detailed studies of aerodynamics or making initial design of near space vehicles.展开更多
Fuzzy soft topology considers only membership value.It has nothing to do with the non-membership value.So an extension was needed in this direction.Vague soft topology addresses bothmembership and non-membership value...Fuzzy soft topology considers only membership value.It has nothing to do with the non-membership value.So an extension was needed in this direction.Vague soft topology addresses bothmembership and non-membership values simultaneously.Sometimes vague soft topology(single structure)is unable to address some complex structures.So an extension to vague soft bi-topology(double structure)was needed in this direction.To make this situation more meaningful,a new concept of vague soft bi-topological space is introduced and its structural characteristics are attempted with a new definition.In this article,new concept of vague soft bi-topological space(VSBTS)is initiated and its structural behaviors are attempted.This approach is based on generalized vague soft open sets,known as vague softβopen sets.An ample of examples are given to understand the structures.For the non-validity of some results,counter examples are provided to pay the price.Pair-wise vague softβopen and pair-wise vague softβclose sets are alsoaddressedwith examples in(VSBTS).Vague soft separation axioms are initiatedin(VSBTS)concerning soft points of the space.Other separation axioms are also addressed relative to soft points of the space.Vague soft bi-topological properties are studied with the application of vague softβopen sets with respect to soft points of the spaces.The characterization of vague softβclose as well as vague softβopen sets,characteristics of Bolzano Weirstrass property,vague soft compactness and its marriage with sequences,interconnection between sequential compactness and countable compactness in(VSBTS)with respect to softβopen sets are addressed.展开更多
In the present paper, we define Dislocated Soft Metric Space and discuss about the existence and uniqueness of soft fixed point of a cyclic mapping in soft dislocated metric space. We also prove the unique soft fixed ...In the present paper, we define Dislocated Soft Metric Space and discuss about the existence and uniqueness of soft fixed point of a cyclic mapping in soft dislocated metric space. We also prove the unique soft fixed point theorems of a cyclic mapping in the context of dislocated soft metric space. Examples are given for support of the results.展开更多
While increasing contact between peoples and cultures,globalization does not weaken the diversity of world's civilizations.Soft power can serve as a lubricant to prevent the clash of civilizations and enhance dial...While increasing contact between peoples and cultures,globalization does not weaken the diversity of world's civilizations.Soft power can serve as a lubricant to prevent the clash of civilizations and enhance dialogues between civilizations.The article summarizes the three components of China's soft power:cultural promoting,foreign assistance and the thought of"a harmonious world."Taking Uzbekistan as an example,the author also illustrates the path of the Islamic nations to implement"soft power"strategy.展开更多
1 Introduction Since the early of 1980’s,the studies of soft X-ray and EUV optics have been implemented in CIOMP (Changchun Institute of Optics,Fine Mechanics and Physics)．So far,the research system of soft X-ray an...1 Introduction Since the early of 1980’s,the studies of soft X-ray and EUV optics have been implemented in CIOMP (Changchun Institute of Optics,Fine Mechanics and Physics)．So far,the research system of soft X-ray and EUV optics has been founded including sources,ra- diometry,testing and manufacturing of the super smooth mirror and multilayer coating mirror fabrication．Based on the above technologies,we started to develop the soft X-ray and EUV optical system such as a space EUV solar telescope and a EUV imager．展开更多
目的基于Cite Space软件对氨甲环酸应用于全膝关节置换术的文献进行计量及可视化分析。方法检索Web of Science核心合集数据库中有关氨甲环酸应用于全膝关节置换术的相关文献,检索起止时间为2000年1月至2020年12月。使用Excel 2016对纳...目的基于Cite Space软件对氨甲环酸应用于全膝关节置换术的文献进行计量及可视化分析。方法检索Web of Science核心合集数据库中有关氨甲环酸应用于全膝关节置换术的相关文献,检索起止时间为2000年1月至2020年12月。使用Excel 2016对纳入文献进行描述性分析,以及Cite Space 5.8.R3软件对纳入文献进行国家/地区、机构及作者、期刊共被引及文献共被引进行分析,对关键词进行共现分析、聚类及突现分析。结果共获得994篇相关文献,2000—2020年氨甲环酸应用于全膝关节置换术研究的发文量总体呈上升趋势。发文量较高的国家/地区是中国与美国,四川大学是发文量最高的机构,发文量最多的作者是裴福兴。该领域相关研究的文献中引用最多的杂志是《J Bone Joint Surg Am》,引用频次最高的文献是Yang在2012年发表的一篇meta分析。其关键词聚类通过归纳可以分为3类,分别从术中、术后及药物本身几个方面反映出失血量、使用途径及术后康复等研究热点。结论氨甲环酸应用于全膝关节置换术研究总体上呈上升趋势,其中围手术期失血量、氨甲环酸使用途径及术后康复方面的研究是该领域的研究热点,同时也是未来的研究趋势。展开更多
By interpreting the definition of "soft decoration",this study puts forward that such a decoration way can keep the weaknesses of a house unexposed,highlight the smart designs,re-divide and recombine interio...By interpreting the definition of "soft decoration",this study puts forward that such a decoration way can keep the weaknesses of a house unexposed,highlight the smart designs,re-divide and recombine interior spaces and fill empty spaces,so that deficiencies of hard decoration in a house can be made up,by playing the role of soft decoration in refining interior spaces and improving their functions.Moreover,it is proposed that "devoting less in hard decoration but more in soft decoration" will be a new trend of interior decoration.展开更多
Soft machine refers to a kind of mechanical system made of soft materials to complete sophisticated missions, such as handling a fragile object and crawling along a narrow tunnel corner, under low cost control and act...Soft machine refers to a kind of mechanical system made of soft materials to complete sophisticated missions, such as handling a fragile object and crawling along a narrow tunnel corner, under low cost control and actuation. Hence, soft machines have raised great challenges to computational dynamics. In this review article, recent studies of the authors on the dynamic modeling, numerical simulation, and experimental validation of soft machines are summarized in the framework of multibody system dynamics. The dynamic modeling approaches are presented first for the geometric nonlinearities of coupled overall motions and large deformations of a soft component, the physical nonlinearities of a soft component made of hyperelastic or elastoplastic materials, and the frictional contacts/impacts of soft components, respectively. Then the computation approach is outlined for the dynamic simulation of soft machines governed by a set of differential-algebraic equations of very high dimensions, with an emphasis on the efficient computations of the nonlinear elastic force vector of finite elements. The validations of the proposed approaches are given via three case studies, including the locomotion of a soft quadrupedal robot, the spinning deployment of a solar sail of a spacecraft, and the deployment of a mesh reflector of a satellite antenna, as well as the corresponding experimental studies. Finally, some remarks are made for future studies.展开更多
In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of accelerat...In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of acceleration, displacement and internal forces was examined. The test results indicate that the seismic acceleration responses of models are generally greater than the surrounding soil surface in the period ranges of 2–10 seconds. Foundation instant settlements for 4×4 and 3×3 piled raft (with pile spacing equal to 4 and 6 times pile diameter) are somewhat close to each other at the end of the earthquake, but reconsolidation settlements are greater for 3×3 piled raft. The seismic acceleration of superstructure, the uneven settlement of the foundation and the maximum bending moment of pile are relatively lower for 3×3 piled raft. Successive earthquakes lead to the softening behavior of soft clay, which causes a reduction of the pile bearing capacity and thus loads are transferred from the pile group to the raft. For the case of a 3×3 piled raft, there is relatively smaller change of the load sharing ratio of the pile group and raft after the earthquake and the distribution of maximum bending moments at the pile head is more uniform.展开更多
基金supported by the National Natural Science Foundation of China (90716009)
文摘In this note, we design a velocity-altitude map for hypersonic level flight in near space of altitude 20-100 km. This map displays aerodynamic-related parameters associated with near space level flight, schematically or quantitatively. Various physical conditions for the near-space level flight are then characterized, including laminar or turbulent flow, rarefaction or continuous flow, aerodynamic heating, as well as conditions for sustaining level flight with and without orbital effect. This map allows one to identify conditions to have soft flight or hard flight, and this identification would be helpful for making correct planning on detailed studies of aerodynamics or making initial design of near space vehicles.
文摘Fuzzy soft topology considers only membership value.It has nothing to do with the non-membership value.So an extension was needed in this direction.Vague soft topology addresses bothmembership and non-membership values simultaneously.Sometimes vague soft topology(single structure)is unable to address some complex structures.So an extension to vague soft bi-topology(double structure)was needed in this direction.To make this situation more meaningful,a new concept of vague soft bi-topological space is introduced and its structural characteristics are attempted with a new definition.In this article,new concept of vague soft bi-topological space(VSBTS)is initiated and its structural behaviors are attempted.This approach is based on generalized vague soft open sets,known as vague softβopen sets.An ample of examples are given to understand the structures.For the non-validity of some results,counter examples are provided to pay the price.Pair-wise vague softβopen and pair-wise vague softβclose sets are alsoaddressedwith examples in(VSBTS).Vague soft separation axioms are initiatedin(VSBTS)concerning soft points of the space.Other separation axioms are also addressed relative to soft points of the space.Vague soft bi-topological properties are studied with the application of vague softβopen sets with respect to soft points of the spaces.The characterization of vague softβclose as well as vague softβopen sets,characteristics of Bolzano Weirstrass property,vague soft compactness and its marriage with sequences,interconnection between sequential compactness and countable compactness in(VSBTS)with respect to softβopen sets are addressed.
文摘In the present paper, we define Dislocated Soft Metric Space and discuss about the existence and uniqueness of soft fixed point of a cyclic mapping in soft dislocated metric space. We also prove the unique soft fixed point theorems of a cyclic mapping in the context of dislocated soft metric space. Examples are given for support of the results.
文摘While increasing contact between peoples and cultures,globalization does not weaken the diversity of world's civilizations.Soft power can serve as a lubricant to prevent the clash of civilizations and enhance dialogues between civilizations.The article summarizes the three components of China's soft power:cultural promoting,foreign assistance and the thought of"a harmonious world."Taking Uzbekistan as an example,the author also illustrates the path of the Islamic nations to implement"soft power"strategy.
文摘1 Introduction Since the early of 1980’s,the studies of soft X-ray and EUV optics have been implemented in CIOMP (Changchun Institute of Optics,Fine Mechanics and Physics)．So far,the research system of soft X-ray and EUV optics has been founded including sources,ra- diometry,testing and manufacturing of the super smooth mirror and multilayer coating mirror fabrication．Based on the above technologies,we started to develop the soft X-ray and EUV optical system such as a space EUV solar telescope and a EUV imager．
文摘针对现有的深度获取方式存在数据缺失、分辨率低等问题,提出一种基于软聚类的深度图增强方法,称为软聚类求解器.该方法利用软聚类的强边缘保持特性提高深度图增强的精度.将软聚类仿射矩阵和加权最小二乘模型有机结合,构建了软聚类求解器中的置信加权最小二乘模型,提出了基于迭代的求解方法.为评估所提出的方法,在多项深度图增强任务上进行试验,包括深度图补洞、深度图超分辨率和深度图纠正,评价指标包含了峰值信噪比(PSNR)、结构相似度(SSIM)、均方根差(RMSE)和运行效率.结果表明:文中方法在深度图补洞任务中的平均PSNR达到了42.28,平均SSIM达到了98.83%;在深度图超分辨率、深度图纠正任务中的平均RMSE达到了8.96、 2.36.文中方法处理1张分辨率为2 048×1 024像素的图像仅需5.03 s.
文摘目的基于Cite Space软件对氨甲环酸应用于全膝关节置换术的文献进行计量及可视化分析。方法检索Web of Science核心合集数据库中有关氨甲环酸应用于全膝关节置换术的相关文献,检索起止时间为2000年1月至2020年12月。使用Excel 2016对纳入文献进行描述性分析,以及Cite Space 5.8.R3软件对纳入文献进行国家/地区、机构及作者、期刊共被引及文献共被引进行分析,对关键词进行共现分析、聚类及突现分析。结果共获得994篇相关文献,2000—2020年氨甲环酸应用于全膝关节置换术研究的发文量总体呈上升趋势。发文量较高的国家/地区是中国与美国,四川大学是发文量最高的机构,发文量最多的作者是裴福兴。该领域相关研究的文献中引用最多的杂志是《J Bone Joint Surg Am》,引用频次最高的文献是Yang在2012年发表的一篇meta分析。其关键词聚类通过归纳可以分为3类,分别从术中、术后及药物本身几个方面反映出失血量、使用途径及术后康复等研究热点。结论氨甲环酸应用于全膝关节置换术研究总体上呈上升趋势,其中围手术期失血量、氨甲环酸使用途径及术后康复方面的研究是该领域的研究热点,同时也是未来的研究趋势。
文摘By interpreting the definition of "soft decoration",this study puts forward that such a decoration way can keep the weaknesses of a house unexposed,highlight the smart designs,re-divide and recombine interior spaces and fill empty spaces,so that deficiencies of hard decoration in a house can be made up,by playing the role of soft decoration in refining interior spaces and improving their functions.Moreover,it is proposed that "devoting less in hard decoration but more in soft decoration" will be a new trend of interior decoration.
基金supported in part by the National Natural Science Foundation of China (Grants 11290150 and 11290151)
文摘Soft machine refers to a kind of mechanical system made of soft materials to complete sophisticated missions, such as handling a fragile object and crawling along a narrow tunnel corner, under low cost control and actuation. Hence, soft machines have raised great challenges to computational dynamics. In this review article, recent studies of the authors on the dynamic modeling, numerical simulation, and experimental validation of soft machines are summarized in the framework of multibody system dynamics. The dynamic modeling approaches are presented first for the geometric nonlinearities of coupled overall motions and large deformations of a soft component, the physical nonlinearities of a soft component made of hyperelastic or elastoplastic materials, and the frictional contacts/impacts of soft components, respectively. Then the computation approach is outlined for the dynamic simulation of soft machines governed by a set of differential-algebraic equations of very high dimensions, with an emphasis on the efficient computations of the nonlinear elastic force vector of finite elements. The validations of the proposed approaches are given via three case studies, including the locomotion of a soft quadrupedal robot, the spinning deployment of a solar sail of a spacecraft, and the deployment of a mesh reflector of a satellite antenna, as well as the corresponding experimental studies. Finally, some remarks are made for future studies.
基金National Natural Science Foundation of China under Grand No.41372274
文摘In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of acceleration, displacement and internal forces was examined. The test results indicate that the seismic acceleration responses of models are generally greater than the surrounding soil surface in the period ranges of 2–10 seconds. Foundation instant settlements for 4×4 and 3×3 piled raft (with pile spacing equal to 4 and 6 times pile diameter) are somewhat close to each other at the end of the earthquake, but reconsolidation settlements are greater for 3×3 piled raft. The seismic acceleration of superstructure, the uneven settlement of the foundation and the maximum bending moment of pile are relatively lower for 3×3 piled raft. Successive earthquakes lead to the softening behavior of soft clay, which causes a reduction of the pile bearing capacity and thus loads are transferred from the pile group to the raft. For the case of a 3×3 piled raft, there is relatively smaller change of the load sharing ratio of the pile group and raft after the earthquake and the distribution of maximum bending moments at the pile head is more uniform.
