|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | High-Order Models of Nonlinear and Dispersive Wave in Water of Varying Depth with Arbitrary Sloping Bottom显示文摘High-order models with a dissipative term for nonlinear and dispersive wave in water of va-rying depth with an arbitrary sloping bottom are presented in this article.First,the formal derivations toany high order of μ(=h/λ,depth to deep-water wave length ratio)and ε(=α/h,wave amplitude todepth ratio)for velocity potential,particle velocity vector,pressure and the Boussinesq-type equations forsurface elevation η and horizontal velocity vector U at any given level in water are given.Then,the exactexplicit expressions to the fourth order of μ are derived.Finally,the linear solutions of η,U,C(phase ce-lerity)and C_g(group velocity)for a constant water depth are obtained.Compared with the Airy theory,excellent results can be found even for a water depth as large as the wave legnth.The present high-ordermodels are applicable to nonlinear regular and irregular waves in water of any varying depth(from shal-low to deep)and bottom slope(from mild to steep). | Hong Guangwen Professor, Coastal and Ocean Engineering Research Institute, Hohai University, Nanjing 210024, P. R. China. | 1997 | China Ocean Engineering1997，12，3： | 26 |
| 2 | 基于感性工学的人机界面多意象评价显示文摘为了给人机界面设计提供有效的评价手段,围绕用户对人机界面的感性需求,提出了基于感性工学的人机界面多意象评价方法。首先运用感性工学方法建立感性指标评价体系,在指标权重分配上,通过将灰色关联分析法引入群层次分析(analytic hierarchy process,AHP)法中,利用改进的群AHP法求取综合权重,解决了传统AHP法主观性过强的缺点;同时根据感性工学评价的模糊性,建立了一种直觉模糊集理论和TOPSIS(technique for order preference by similarity to an ideal solution)法相结合的综合评价模型。结合数控机床人机界面设计方案验证了该评价方法的有效性和可行性。该方法对人机界面感性设计与设计评价具有一定的参考意义。 | 袁树植 高虹霓 王崴 瞿珏 刘晓卫 李康 | 2017 | 工程设计学报2017，24，5： | 23 |
| 3 | “老漂族”长期定居意愿研究——基于成功老龄化的框架显示文摘基于成功老龄化的框架,定量分析老年流动人口长期定居意愿的现状及影响因素,并探求其内在的影响机制。将成功老龄化分解为经济因素、社会融入因素和健康因素三个维度,以老年流动人口长期定居意愿为因变量,基本人口特征、人口流动特征为控制变量,逐层纳入经济因素、社会融入因素和健康因素作为自变量,构建三个多变量的回归模型。实证结果与三个假设基本吻合:老年流动人口长期定居意愿与经济因素、社会融合因素、健康因素均存在显著相关性,经济宽裕、积极参与社交活动、身体健康的老年流动人口在当地长期定居的意愿更强;分流动原因、分户籍进行了稳健性检验。分样本回归估计结果与全样本结果基本一致。在人口快速老龄化背景下探索老年流动人口的长期定居意愿及内在机制,积极实现配套实施的完善,为有效应对人口老龄化、保障老年流动人口基本权益以及维系流动家庭的和谐稳定,具有重要意义。 | 杨妮 许倩 王艳 | 2018 | 人口与发展2018，24，3： | 20 |
| 4 | On coeffcient estimates for a class of holomorphic mappings显示文摘Let X be a complex Banach space with norm · , B be the unit ball in X, Dn be the unit polydisc in Cn. In this paper, we introduce a class of holomorphic mappings Mg on B or Dn. Let f(x) be a normalized locally biholomorphic mapping on B such that (Df(x))-1f(x) ∈ Mg and f(x) - x has a zero of order k + 1 at x = 0. We obtain coeffcient estimates for f(x). These results unify and generalize many known results. | XU QingHua1 & LIU TaiShun2 1 College of Mathematics and Information Science, Jiangxi Normal University, Nanchang 330027, China 2 Department of Mathematics, Huzhou Teacher’s College, Huzhou 313000, China | 2009 | Science China Mathematics2009，52，4： | 18 |
| 5 | A refinement about estimation of expansion coefficients for normalized biholomorphic mappings显示文摘A refining estimation of homogeneous expansion for f is discussed, where f belongs to a subclass of all normalized biholomorphic mappings defined on the unit polydisk in Cn or the unit ball in complex Banach spaces, and x = 0 is a zero of order k + 1 of f(x) - x. Moreover, an estimation of homogeneous expansion for subordinate mappings defined on the unit ball in complex Banach spaces is also given. | LIU Taishun LIU Xiaosong | 2005 | Science China Mathematics2005，48，7： | 18 |
| 6 | ON SOLUTION OF A KIND OF RIEMANN BOUNDARY VALUE PROBLEM WITH SQUARE ROOTS显示文摘Solution of the Riemann boundary value problem with square roots (1.1) for analytic functions proposed in [1] is reconsidered, which was solved under certain assumptions on the branch points appeared. Here the work is continued without these assumptions and the problem is solved in the general case. | 路见可 | 2002 | Acta Mathematica Scientia2002，22，2： | 18 |
| 7 | ERA modal identification method for hydraulic structures based on order determination and noise reduction of singular entropy显示文摘Modal parameter has been considered as one of the indices in assessing the working state of hydraulic structures. The method for obtaining the modal parameter indices is crucial for health monitoring of hydraulic structures. Traditionally, model parameters are measured from the prototype dynamic test under the excitation of special equipment. The preparation is time-consuming and the method is difficult to carry out. We propose a method in this paper to denoise, reconstruct, determine the order and identify modal parameters based on singular entropy (SE) of eigenmatrix. It can be used to solve the problem of system eigenmatrix order determination, and to identify the modal order and the characteristics of structures under the working state. Finally, this method is applied to identify the operational modal parameters of Ertan arch dam under different flood discharging states and vibration frequencies of the powerhouse with a two-row placed unit in Lijiaxia hydropower station during the unit halting process. This new method provides a simple way to identify the modal parameters of large-scale hydraulic structures under ambient excitation. | LIAN JiJian LI HuoKun ZHANG JianWei | 2009 | Science China(Technological Sciences)2009，52，2： | 16 |
| 8 | 基于dq锁相环的改进型光伏电站并网点电压跌落检测方法研究显示文摘快速准确检测出并网点电压不同类型的跌落故障是光伏电站实现低电压穿越的前提。针对电压负序分量导致基于dq锁相环的常规检测方法无法检测电压不对称跌落的问题,采用二阶广义积分法对电压进行相序分离,滤除负序分量让正序分量进入锁相环,实现对电压不对称跌落故障的检测。基于Matlab/Simulink搭建了仿真平台,仿真结果表明上述方法对多种类型的电压跌落故障有较高检测精度,验证了该方法的可行性。 | 罗劲松 王金梅 张小娥 | 2014 | 电测与仪表2014，51，5： | 15 |
| 9 | RELIABILITY ANALYSIS OF FRP LAMINATED PLATES WITH CONSIDERATION OF BOTH INITIAL IMPERFECTION AND FAILURE SEQUENCE显示文摘A probabilistie progressive failure analyzing method is applied to estimating the reliability of asimply supported laminated eomposite plate with an initial imperfection under bi-axial eompression load.Theinitial imperfection and the strength parameters are considered as random variables.Ply-level failure proba-bility is evaluated by the first order reliability method(FORM)together with the Tsai-Wu strength eriterionand Tan criterion.Current stresses in the laminated structure are calculated by the classical lamination theorywith the stiffness modified based on the last step ply failure.Probabilistieally dominant ply-level failure se-quences leading to overall system failure are identified,based on which the system failure probability is esti-mated.A numerieal example is presented to demonstrate the methodology proposed.Through parameter stud-ies it is shown that the deviation of the initial imperfeetion and some of the strength parameters largely influ-ence the system reliability. | Chen, JQ Wang, XY Luo, C | 2002 | Acta Mechanica Solida Sinica2002，15，3： | 15 |
| 10 | Hybrid first and second order attention Unet for building segmentation in remote sensing images显示文摘Recently,building segmentation(BS)has drawn significant attention in remote sensing applications.Convolutional neural networks(CNNs)have become the mainstream analysis approach in this field owing to their powerful representative ability.However,owing to the variation in building appearance,designing an effective CNN architecture for BS still remains a challenging task.Most of CNN-based BS methods mainly focus on deep or wide network architectures,neglecting the correlation among intermediate features.To address this problem,in this paper we propose a hybrid first and second order attention network(HFSA)that explores both the global mean and the inner-product among different channels to adaptively rescale intermediate features.As a result,the HFSA can not only make full use of first order feature statistics,but also incorporate the second order feature statistics,which leads to more representative feature.We conduct a series of comprehensive experiments on three widely used aerial building segmentation data sets and one satellite building segmentation data set.The experimental results show that our newly developed model achieves better segmentation performance over state-of-the-art models in terms of both quantitative and qualitative results. | Nanjun HE Leyuan FANG Antonio PLAZA | 2020 | Science China(Information Sciences)2020，63，4： | 15 |
| 11 | OSCILLATIONS OF FOURTH ORDER ODE WITH IMPULSES显示文摘Sufficient conditions to guarantee the oscillations of fourth order ODE with impulses are obtained. The importance of the impulsive effect on the oscillations of higher order differential equations is stressed. | 冯伟贞 | 2003 | Annals of Differential Equations2003，19，2： | 13 |
| 12 | The Simultaneous Approximation Order by Hermite Interpolation in a Smooth Domain | Tian Liang TU Department of Information Engineering, North China Institute of Hydroelectricity, Zhengzhou 450045, P. R. China | 2002 | Acta Mathematica Sinica,English Series2002，18，4： | 12 |
| 13 | On subnormal solutions of second order linear periodic differential equations显示文摘In this paper, we investigate the existence and the form of subnormal solution for a class of second order periodic linear differential equations, estimate the growth properties of all solutions, and answer the question raised by Gundersen and Steinbart. | Kwang Ho SHON | 2007 | Science China Mathematics2007，50，6： | 11 |
| 14 | Kinetics of indium dissolution from marmatite with high indium content in pressure acid leaching显示文摘The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, H_2SO_4 concentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r-min^(-1), its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration, temperature, partial oxygen pressure, and the decrease in particle size. Moreover, the results demonstrate that the process of indium leaching is controlled by interface chemical reaction, with apparent activation energy of 65.7 k J-mol^(-1). The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process follows shrinking unreacted core model. And finally, the kinetics model equation is established for indium. | Lei Tian Yan Liu Ting-An Zhang Guo-Zhi Lv Shuang Zhou Guo-Quan Zhang | 2017 | Rare Metals2017，36，1： | 11 |
| 15 | 厌氧发酵起始阶段通氧对玉米秸秆产甲烷特性的影响显示文摘基于厌氧发酵起始阶段的氧供应量控制,研究了厌氧发酵起始阶段通氧对玉米秸秆产甲烷特性的影响。当氧气供应量为10 ml·(g VS)-1时,甲烷产量达到最大为299.8 ml·(g VS)-1,相对于不做处理的样品甲烷产量提高了8.4%。但是,氧气供应量的继续提高并没有带来甲烷产量的升高,当氧气供应量大于40 ml·(g VS)-1时,甲烷产量相对于不做处理的秸秆样品轻微下降。modified first order equation模型拟合分析表明起始阶段微好氧处理可以加快底物的水解速度,但氧气供应量过大会延长厌氧发酵的延滞时间。另外,经过起始阶段通氧处理,秸秆厌氧发酵的VS降解率也有所提高。 | 付善飞 许晓晖 师晓爽 赵玉中 王传水 郭荣波 | 2015 | 化工学报2015，66，3： | 11 |
| 16 | A Generalized Riemann Boundary Value Problem显示文摘The generalized Riemann boundary value problem for analytic functions is considered, where the unknown function may have branch points of the second order. Under certain assumptions, its general solution as well as the condition of solvability is obtained when the solution is required to be of finite order at infinity. | LIU Hua LU Jian | 2000 | Wuhan University Journal of Natural Sciences2000，5，2： | 10 |
| 17 | A NEW HIGH ORDER SCHEME FOR CONVECTION EQUATION AND ITS APPLICATION显示文摘With the undetermined coefficient method, a new high order scheme for convection equation named as HAUC was worke d out. The accuracy of the new scheme was analyzed by comparing the computed res ults with the exact solutions of 1-D pure convection equation and nonlinear con vection equation. The effectiveness of the HAUC was also examined by comparing w ith the results obtained by other schemes. Finally, it was applied to simulate 1 -D dam break flow with differenct ratios of initial upstream water depth to do wnstream one. The results show that the scheme has the ability to simulate both undular bores and moving hydraulic jumps. | Zhang Xiao-feng (Department of River Engineering, Wuhan University, Wuhan 430072, China) Zhang Hong-wu (Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China) Tamotsu Takahashi, Hajime Nakagawa (Disaster Prevention Research | 2002 | Journal of Hydrodynamics2002，14，1： | 10 |
| 18 | On quasi-convex mappings of order α in the unit ball of a complex Banach space显示文摘In this paper, a class of biholomorphic mappings named quasi-convex mapping of order α in the unit ball of a complex Banach space is introduced. When the Banach space is confined to Cn, we obtain the relation between this class of mappings and the convex mappings.Furthermore, the growth and covering theorems of this class of mappings are given on the unit ball of a complex Banach space Ⅹ. Finally, we get the second order terms coefficient estimations of the homogeneous expansion of quasi-convex mapping of order α defined on the polydisc in Cn and on the unit ball in a complex Banach space, respectively. | LIU Taishun & XU Qinghua Department of Mathematics, Huzhou Teachers College, Huzhou, 313000, China Department of Mathematics, Jiangxi Normal University, Nanchang, 330022, China | 2006 | Science China Mathematics2006，49，11： | 9 |
| 19 | Automorphism Groups of Some Finite Groups显示文摘Let G be a group of odd order In this paper we prove that G cannot function as the full automorphism group of a finite group when G has a small order. | 李世荣 | 1994 | Science China Mathematics1994，37，3： | 9 |
| 20 | A classification of some regular p-groups and its applications显示文摘In this paper we classify regular p-groups with type invariants (e, 1, 1, 1) for e ≥ 2 and (1, 1, 1, 1, 1). As a by-product, we give a new approach to the classification of groups of order p5, p ≥ 5 a prime. | ZHANG Qinhai SONG Qiangwei XU Mingyao | 2006 | Science China Mathematics2006，49，3： | 9 |
您所在的机构暂未开通此部分的功能，请联系管理员