高职院校班级管理新模式探索

从高职院校特色班级建设的缘起、理论基础与实践原则三方面出发,对特色班级建设这一旨在促进学生全面发展的德育教育新模式进行理论与实践方面的探索,创新高职院校班级管理的理念,强化班级管理的德育教育功能.     

大学计算机基础教学中案例选取的原则和方法

根据大学计算机基础的课程特点,分析该课程教学案例选取时需考虑的因素,并阐述该课程教学中案例选取的原则和方法。     

Midas/GTS在边坡稳定性与地基沉降分析中的应用

为了解决边坡稳定性与地基沉降对建筑物的影响,根据工程地质条件、地基处理方案、桩位布置及其他相关资料,基于Midas/GTS软件建立了某人工地基沉降和稳定性分析的二维施工过程模型.模拟并分析了三种不同施工工况条件下地基沉降的差别,同时对土层的位移场、应力场进行了对比分析,从不同角度对地基的稳定性进行了评估.分析表明:处理后的地基沉降量比较均匀,土层水平位移较小;地基的位移和应力以及桩基的位移均符合相关要求,土坡稳定性安全系数高.因此,该人工地基是安全可靠的.进一步的研究表明,为了增强该场地的安全性,可以采取开挖减压沟等工程措施.本文可以为类似地质条件的地基设计和施工过程控制提供理论参考和工程措施.     

Examining Recruitment and Retention Factors for Minority STEM Majors Through a Stereotype Threat Lens

Prior research regarding minorities in the science, technology, engineering, and mathematics (STEM) fields indicated that the factors of peer support and participation in STEM‐related activities contributed positively to minority students' recruitment and retention in these fields. Utilizing stereotype threat as a conceptual framework, this qualitative case study investigated the contribution of these factors by examining the experiences of minority students majoring in a STEM field. Data analyzed through a deductive approach indicated that a stereotype threat adversely affecting retention and recruitment in STEM could be either minimized or maximized by peer support, in the form of educator or familial influence, and participation in STEM‐related activities through internships and the application of STEM‐related knowledge. Findings from this research may inform higher education institutional practices involving the recruitment and retention of students to the STEM fields from minority populations.     

Convolution of Lorentz Invariant Ultradistributions and Field Theory

A general definition of convolution between two arbitrary four-dimensional Lorentz invariant (fdLi) tempered ultradistributions is given, in both Minkowski and Euclidean space (spherically symmetric tempered Ultradistributions). The product of two arbitrary fdLi distributions of exponential type is defined via the convolution of its corresponding Fourier transforms. Several examples of convolution of two fdLi tempered ultadisrtibutions are given. In particular, we calculate exactly the convolution of two Feynman's massless prapagators. An expression for the Fourier transform of a Lorentz invariant tempered ultradistribution in terms of modified Bessel distributions is obtained in this work (generalization of Bochner's formula to Minkowski space). From the deduction of the convoltion formula, we obtain the generalization to the Minkowski space, of the dimensional regularization of the perturbation theory of Green functions in the Euclidean configuration space given in Erdelyi (Higher Transcendental Functions, 1953). As an example we evaluate the convolution of two n-dimensional complex-mass Wheeler propagators.     

铁摩辛柯基础梁的解析解和广义克雷洛夫函数

河南省自然科学基金项目（９８４０７０７００）资助摘要 定义并讨论了一类广义克雷洛夫函数，给出了用该函数表示的弹性地基上铁摩辛柯梁的解析解     

On the geometrization of quantum mechanics

Nonrelativistic quantum mechanics is commonly formulated in terms of wavefunctions (probability amplitudes) obeying the static and the time-dependent Schrödinger equations (SE). Despite the success of this representation of the quantum world a wave–particle duality concept is required to reconcile the theory with observations (experimental measurements). A first solution to this dichotomy was introduced in the de Broglie–Bohm theory according to which a pilot-wave (solution of the SE) is guiding the evolution of particle trajectories. Here, I propose a geometrization of quantum mechanics that describes the time evolution of particles as geodesic lines in a curved space, whose curvature is induced by the quantum potential. This formulation allows therefore the incorporation of all quantum effects into the geometry of space–time, as it is the case for gravitation in the general relativity.     

A two-phase model and related numerical tool for the design of soil structures reinforced by stiff linear inclusions

A two-phase macroscopic model is presented for ascertaining the overall linear elastic behaviour of a soil reinforced by stiff long inclusions, with a particular emphasis on the shear and flexural behaviour of the reinforcements. Based on a minimum principle for the potential energy of any two-phase system, expressed as a function of the kinematically admissible displacement and rotation fields, a finite element formulation is established, resulting in the elaboration of a numerical computer code devoted to the simulation of any reinforced soil structure under plane strain conditions. This finite element code is applied to the evaluation of the settlements experienced by a rigid raft foundation placed on top of a soil reinforced by a group of vertical piles, and subject to combined loading conditions. One of the important conclusions which may be drawn from such a quantitative analysis is that the shear and flexural behaviour of the reinforcing piles, as well as the way these piles are connected to the foundation, play a decisive role in the case of lateral loading.     

On Formulating and Assessing Continuum Theories of Electromagnetic Fields in Elastic Materials

My aim is to explore some ideas about the foundations of electromagnetic theory for elastic materials and to suggest some ways of assessing theories of this kind. I will describe some old ideas that seem to have been forgotten, about forces exerted by matter and fields on each other, and a similar idea about energies. Among other things, I will trace Toupin’s thinking about elastic dielectrics, showing how he moved toward using these ideas, although he did not explicitly recognize them. Further, I will explain how his dynamical theory can be interpreted to be consistent with them, although this is not obvious from what he wrote. Dedicated to the memory of Ronald Rivlin.     

Proposal to Test a Transient Deviation from Quantum Mechanics’ Predictions for Bell’s Experiment

Quantum mechanics predicts correlations between measurements performed in distant regions of a spatially spread entangled state to be higher than allowed by intuitive concepts of Locality and Realism. These high correlations forbid the use of nonlinear operators of evolution (which would be desirable for several reasons), for they may allow faster-than-light signaling. As a way out of this situation, it has been hypothesized that the high quantum correlations develop only after a time longer than L/c has elapsed (where L is the spread of the entangled state and c is the velocity of light). In shorter times, correlations compatible with Locality and Realism would be observed instead. A simple hidden variables model following this hypothesis is described. It is based on a modified Wheeler–Feynman theory of radiation. This hypothesis has not been disproved by any of the experiments performed to date. A test achievable with accessible means is proposed and described. It involves a pulsed source of entangled states and stroboscopic record of particle detection during the pulses. Data recorded in similar but incomplete optical experiments are analyzed, and found consistent with the proposed model. However, it is not claimed, in any sense, that the hypothesis has been validated. On the contrary, it is stressed that a complete, specific test is absolutely needed.