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Analysis of synergy degree and its influencing factors in hydropower EPC project management
Jiwei ZHU, Hua GAO, Jiangrui WANG
《工程管理前沿(英文)》 2021年 第8卷 第3期 页码 402-411 doi: 10.1007/s42524-020-0098-0
关键词: hydropower project EPC mode synergy degree model grey relational analysis
Effect of fiber hybridization on energy absorption and synergy in concrete
Ahmadreza RAMEZANI, Mohammad Reza ESFAHANI
《结构与土木工程前沿(英文)》 2019年 第13卷 第6期 页码 1338-1349 doi: 10.1007/s17009-019-0558-2
关键词: hybrid fiber-reinforced concrete synergy toughness steel fibers polypropylene fibers
WU Junmei, TAO Wenquan
《能源前沿(英文)》 2007年 第1卷 第3期 页码 365-369 doi: 10.1007/s11708-007-0055-1
关键词: computational inherent mechanism staggered decrease transfer surface
李德毅,刘常昱
《中国工程科学》 2004年 第6卷 第8期 页码 28-34
分布函数是分析随机现象的重要工具,正态分布是最重要的概率分布,在自然科学和社会科学中应用广泛;隶属函数是模糊集合的基石,正态隶属函数也有广泛的应用。但是,精确确定一个模糊概念的隶属函数已经成为模糊学应用的瓶颈。云模型把随机性和模糊性结合起来,用数字特征熵,揭示随机性与模糊性的关联性,并用来表示一个定性概念的粒度。正态云模型通过期望、熵和超熵构成的特定结构发生器,生成定性概念的定量转换值,体现概念的不确定性。这种特定结构不但放宽了形成正态分布的前提条件,而且把精确确定隶属函数放宽到构造正态隶属度分布的期望函数,因而更具有普遍适用性,更简单、直接地完成了定性与定量之间的相互转换过程。
Jingwei Zhang, Lingxin Kong, Yao Chen, Huijiang Huang, Huanhuan Zhang, Yaqi Yao, Yuxi Xu, Yan Xu, Shengping Wang, Xinbin Ma, Yujun Zhao
《化学科学与工程前沿(英文)》 2021年 第15卷 第3期 页码 666-678 doi: 10.1007/s11705-020-1982-1
Ji-liang Zheng,Chen Zheng,Pan Chen,Ching Yuan Luk
《工程管理前沿(英文)》 2014年 第1卷 第4期 页码 364-371 doi: 10.15302/J-FEM-2014053
关键词: order parameter coordinated degree evaluation energy-intensive industry circular economy
Homoharringtonine synergy with oridonin in treatment of t(8; 21) acute myeloid leukemia
Weina Zhang, Ying Lu, Tao Zhen, Xinjie Chen, Ming Zhang, Ping Liu, Xiangqin Weng, Bing Chen, Yueying Wang
《医学前沿(英文)》 2019年 第13卷 第3期 页码 388-397 doi: 10.1007/s11684-018-0624-1
关键词: AML1–ETO c-KIT homoharringtonine oridonin t(8 21) AML synergistic effect
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 34-40 doi: 10.1007/s11465-014-0290-1
As the instant centers in planar mechanisms, the instantaneous poles (or instant poles, in brief) can be used for kinematic analysis in spherical mechanisms. One of the mandatory steps in this analysis is the determination of the location of these poles. This paper presents a theorem showing analytically that the locus of an unknown secondary instant pole in two-degree-of-freedom (2-DOF) spherical mechanisms is a great circle (GC). The exact location of the pole on its GC is obtained based on the configuration of the mechanism and velocity ratio of the two inputs. Moreover, using the results of the theorem, a geometrical technique is presented to determine the GC of the pole.
关键词: spherical mechanisms instantaneous poles great circle angular velocity
Stiffness of a 3-degree of freedom translational parallel kinematic machine
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 233-241 doi: 10.1007/s11465-014-0312-z
In this paper, a typical 3-degree of freedom (3-DOF) translational parallel kinematic machine (PKM) is studied and analyzed whose tool platform has only translations along X-, Y- and Z-axes. It consists of three limbs, each of which have arm and forearm with prismatic-revolute-revolute-revolute (PRRR) joints. Inverse kinematics analysis is carried out to find the slider coordinates and joint angles for a given position of tool platform. Stiffness modeling is done based on the compliance matrices of arm and forearm of each limb. Using the stiffness modeling the variations of minimum and maximum translational stiffness in the workspace are analyzed. For various architectural parameters of the 3-DOF PKM the tendency of variations on the minimum and maximum stiffness over the entire workspace is studied; and also the deflections of the tool platform along X, Y, and Z directions with respect to various forces are presented.
关键词: 3-DOF translational PKM inverse kinematics stiffness modeling translational stiffness
《环境科学与工程前沿(英文)》 2022年 第16卷 第3期 doi: 10.1007/s11783-021-1462-y
•Considering evenness provides a more accurate assessment of sustainable development.
关键词: Water conservation Environmental protection Industry transformation Evenness Sustainable development Dryland
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 344-353 doi: 10.1007/s11465-014-0320-z
This paper is a detailed exploration of instantaneous poles for a class of two-degree-of-freedom (two-DOF) spherical mechanisms (SMs) with seven links or bars. For two-DOF SMs, the secondary instantaneous poles (the ones which cannot be found by direct inspection) must lie on the specified great circles. For many of these mechanisms, however, some of these great circles cannot be obtained by a direct application of Aronhold-Kennedy theorem. This paper presents geometrical and analytical techniques to locate these unknown great circles for three topologies of seven-bar two-DOF SMs.
关键词: spherical mechanisms instantaneous poles Aronhold-Kennedy theorem great circles pencil of meridian
TAO Wenquan, WU Junmei
《能源前沿(英文)》 2008年 第2卷 第1期 页码 71-78 doi: 10.1007/s11708-008-0001-x
关键词: inherent mechanism integral surface rectanglar longitudinal
Error analysis and optimization of a 3-degree of freedom translational Parallel Kinematic Machine
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 120-129 doi: 10.1007/s11465-014-0300-3
In this paper, error modeling and analysis of a typical 3-degree of freedom translational Parallel Kinematic Machine is presented. This mechanism provides translational motion along the Cartesian X-, Y- and Z- axes. It consists of three limbs each having an arm and forearm with prismatic-revolute-revolute-revolute joints. The moving or tool platform maintains same orientation in the entire workspace due to its joint arrangement. From inverse kinematics, the joint angles for a given position of tool platform necessary for the error modeling and analysis are obtained. Error modeling is done based on the differentiation of the inverse kinematic equations. Variation of pose errors along X, Y and Z directions for a set of dimensions of the parallel kinematic machine is presented. A non-dimensional performance index, namely, global error transformation index is used to study the influence of dimensions and its corresponding global maximum pose error is reported. An attempt is made to find the optimal dimensions of the Parallel Kinematic Machine using Genetic Algorithms in MATLAB. The methodology presented and the results obtained are useful for predicting the performance capability of the Parallel Kinematic Machine under study.
关键词: translational Parallel Kinematic Machine error modeling global error transformation index
Regional seismic-damage prediction of buildings under mainshock–aftershock sequence
Xinzheng LU, Qingle CHENG, Zhen XU, Chen XIONG
《工程管理前沿(英文)》 2021年 第8卷 第1期 页码 122-134 doi: 10.1007/s42524-019-0072-x
关键词: regional seismic damage prediction city-scale nonlinear time-history analysis mainshock–aftershock sequence multiple degree-of-freedom (MDOF) model 2014 Ludian earthquake
陈吟颖,王淑娟,陈昌和,徐旭常
《中国工程科学》 2011年 第13卷 第6期 页码 51-56
通过分析我国目前煤炭利用的主要方式和存在的问题,分析对比国内外煤炭高效洁净化利用技术,研究高效洁净化利用技术对环境的影响程度,建立了煤炭高效洁净化利用指标体系,给出了评价煤炭高效洁净化利用程度的洁净化度、生态优化度、低碳度的概念并作出了相应的定量判据,最后提出了我国2030年、2050年煤炭高效洁净化利用的有效途径和发展战略。
关键词: 洁净煤发电 洁净化度 能源可持续发展综合指标 生态优化度 低碳度
标题 作者 时间 类型 操作
Analysis of synergy degree and its influencing factors in hydropower EPC project management
Jiwei ZHU, Hua GAO, Jiangrui WANG
期刊论文
Effect of fiber hybridization on energy absorption and synergy in concrete
Ahmadreza RAMEZANI, Mohammad Reza ESFAHANI
期刊论文
Numerical analysis on heat transfer enhancement by longitudinal vortex based on field synergy principle
WU Junmei, TAO Wenquan
期刊论文
Enhanced synergy between Cu
Jingwei Zhang, Lingxin Kong, Yao Chen, Huijiang Huang, Huanhuan Zhang, Yaqi Yao, Yuxi Xu, Yan Xu, Shengping Wang, Xinbin Ma, Yujun Zhao
期刊论文
An Evaluation Model for the Coordinated Development of a Circular Economy in China and Its Application
Ji-liang Zheng,Chen Zheng,Pan Chen,Ching Yuan Luk
期刊论文
Homoharringtonine synergy with oridonin in treatment of t(8; 21) acute myeloid leukemia
Weina Zhang, Ying Lu, Tao Zhen, Xinjie Chen, Ming Zhang, Ping Liu, Xiangqin Weng, Bing Chen, Yueying Wang
期刊论文
On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
Water resource conservation promotes synergy between economy and environment in China’s northern drylands
期刊论文
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
investigation and analysis of heat transfer enhancement in channel by longitudinal vortex based on field synergy
TAO Wenquan, WU Junmei
期刊论文
Error analysis and optimization of a 3-degree of freedom translational Parallel Kinematic Machine
null
期刊论文
Regional seismic-damage prediction of buildings under mainshock–aftershock sequence
Xinzheng LU, Qingle CHENG, Zhen XU, Chen XIONG
期刊论文