煤矿高应力松软煤层巷道支护改革试验研究

基于煤矿的开采深度不断增加,煤层开采后表现出大变形、大地压、难支护等非线性力学特性,产生了围岩变形量大、速度快、持续时间长,巷道顶板破碎难以成形等现象,结合云驾岭高应力松软煤层的地质条件,通过多次支护试验,最终确定锚注一体化支护方案,结果表明,锚注一体化方案增加了支护体锚固力,有效地控制了两帮位移及顶板下沉。     

Integration of scheduling and control for batch processes using multi‐parametric model predictive control

Integration of scheduling and control results in Mixed Integer Nonlinear Programming (MINLP) which is computationally expensive. The online implementation of integrated scheduling and control requires repetitively solving the resulting MINLP at each time interval. (Zhuge and Ierapetritou, Ind Eng Chem Res. 2012;51:8550–8565) To address the online computation burden, we incorporare multi‐parametric Model Predictive Control (mp‐MPC) in the integration of scheduling and control. The proposed methodology involves the development of an integrated model using continuous‐time event‐point formulation for the scheduling level and the derived constraints from explicit MPC for the control level. Results of case studies of batch processes prove that the proposed approach guarantees efficient computation and thus facilitates the online implementation. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3169–3183, 2014     

工程材料及机械制造基础课程立体化教学与改革的探讨

本文阐述了工程材料及机械制造基础课程整合与课程教学改革的原因、改革的措施。从结果上看,激发和提高了学生的学习兴趣,加强了理论联系实际和工程应用能力培养,这一课程整合与教学改革达到了目标,取得了良好的实践效果,探索了该课程立体化教学和教学实践改革的思路与方法。     

一种新型城镇污水处理一体化间歇曝气生物膜反应器

文中介绍了一种新型城镇污水处理一体化间歇曝气生物膜反应器的工艺系统、技术原理以及实际处理效果,试验结果显示,该工艺对COD、氮、磷均具有良好的去除效果,是一项具有广阔应用前景的新工艺。     

PCB废水处理与循环利用技术

介绍了PCB生产废水的分类及特点,综述了PCB生产废水的处理和循环利用技术,分析了各种处理技术的优缺点,阐述了研发或采用新型的化学处理剂和活性吸附剂,并将各种处理方法有机地融合在一起将成为今后PCB生产废水处理与循环利用技术发展的重要方向。     

浅析地质勘探信息化

地质勘探信息化是地质勘探工作在信息化条件下发展的必然结果,是地质工作信息化的重要组成部分,是提高地质勘探工作质量、效益、水平和能力的最佳途径,是降低地质勘探人力、物力、经济投入的最佳选择,是实现地质勘探工作现代化的重要方法和手段。     

Hybrid membrane and conventional processes comparison for isoamyl acetate production

Four process alternatives for the production of isoamyl acetate, by the liquid phase esterification of acetic acid with isoamyl alcohol, were evaluated by simulation in terms of product purity, energy integration and economics. The analysis involves a transition from conventional (two structures that use acetic acid or alcohol in excess) to hybrid membrane process (two distillation–pervaporation hybrid systems). Acetate recovery is identified as a crucial factor to minimize energy costs in all considered processes. For conventional processes, the amount of energy required for separation, at low acetate recovery levels, is considerably lower if acetic acid is used in excess. For the hybrid processes, there is an optimum value of acetate recovery that minimizes the total required heat duty and membrane area. Hybrid distillation–pervaporation process allows obtaining the specified product purity with lower energy requirements and more economical tradeoffs than the considered conventional processes. The economic optimum design maximizes energy savings and minimizes total annualized costs. After optimization and energy integration, the best process alternative includes, in a hybrid system, one packed bed reactor, two pervaporation units and a distillation column.     

Michael J. Mahoney: A retrospective.

Michael Mahoney, who made seminal contributions not only to the Society for the Exploration of Psychotherapy Integration (SEPI) but also to the entire field of psychotherapy, died a tragic death at the age of 60 on May 31, 2006. He published more than 250 scholarly articles and chapters, authored and edited 19 books (one of which was awarded a Citation Classic by the Science Citation Index), edited 4 journals, and served on 23 editorial boards plus numerous guest editorships and advisory boards. His research spanned a tremendous breadth without sacrificing depth. Primarily, however, he inquired into development across the life course, including but not limited to psychotherapy. Initially trained as a behaviorist, he played a significant role in the cognitive revolution in psychology; he was also a leading figure in constructivist psychotherapies. He was a Fellow of the World Academy of Art and Science, as well as a Fellow of the American Association for the Advancement of Science. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Stochastic direct integration schemes for dynamic systems subjected to random excitations

In this work, a stochastic version of direct integration schemes is constructed, based on a general recursive state space formulation. The technique is applicable to evaluating the second order response statistics of systems subjected to non-stationary random excitations, and is potentially able to handle non-proportional damping. A specific group of these algorithms obtained using one of the most frequently used families of time stepping schemes is introduced. It is shown that statistics obtained for two multi-degree of freedom (MDOF) dynamic systems using the proposed method are in close agreement with those obtained from Monte Carlo simulation when a proper time step is used. Stability of the proposed scheme is systematically investigated and it is concluded that, for the response statistics to be bounded, the time step used in the algorithm has to lie within certain limits.     

Energy‐stepping integrators in Lagrangian mechanics

We present a class of integration schemes for Lagrangian mechanics, referred to as energy‐stepping integrators, that are momentum and energy conserving, symplectic and convergent. In order to achieve these properties we replace the original potential energy by a piecewise constant, or terraced approximation at steps of uniform height. By taking steps of diminishing height, an approximating sequence of energies is generated. The trajectories of the resulting approximating Lagrangians can be characterized explicitly and consist of intervals of piecewise rectilinear motion. We show that the energy‐stepping trajectories are symplectic, exactly conserve all the momentum maps of the original system and, subject to a transversality condition, converge to trajectories of the original system when the energy step is decreased to zero. These properties, the excellent long‐term behavior of energy‐stepping and its automatic time‐step selection property, are born out by selected examples of application, including the dynamics of a frozen Argon cluster, the spinning of an elastic cube and the collision of two elastic spheres. Copyright © 2009 John Wiley & Sons, Ltd.