电火花打孔加工系统

本文介绍了电火花打孔加工系统的工作原理和组成、并对系统中的高压脉冲产生电路的设计进行了详细的阐述     

CUG-2高精度钻参仪及其在深孔生产中的应用

详细介绍了CUG-2高精度钻参仪的组成和联机方法、主要功能、特点以及在山东乳山ZK43-1号深孔中的应用情况。实际应用表明,CUG-2高精度钻参仪不仅能够实时监测、显示和保存监测的钻探参数,还具有预测孔内事故和数据无线传输等显著优点,应用前景广泛。     

基于FLAC~(3D)的引水隧洞主、支洞交叉部位的围岩变形分析

圆形洞室开挖后,岩体中形成一个自由空间,使原来处于挤压状态的围岩,由于失去了支撑而发生向洞内松动变形;如果这种变形超过了围岩本身所能承受的能力,则围岩就会发生破坏。本文应用有限差分法数值模拟软件FLAC3D对主、支洞交叉部位的隧洞围岩变形进行模拟分析。模拟结果表明,隧洞开挖后,围岩各部分的位移量较大,围岩应力集中在主、支洞交叉部位。     

A new vertical‐alignment LC mode with high‐transmittance and fast‐response‐time features

Abstract— A novel pixel design for vertical‐alignment LCDs with superior transmittance has been developed. The new liquid‐crystal mode, refered to as the hole‐induced vertical‐alignment mode (Hi‐VA), uses a via hole of an organic layer on a TFT substrate to achieve multi‐domain alignment. Compared to the conventional design, the Hi‐VA mode has a transmittance of up to 135% with a contrast ratio of 2000:1. Moreover, the new structure is free from ITO patterning or protrusion on the color‐filter side, which makes the fabrication process simple and low cost.     

旋转式倒立摆系统的算法研究及仿真

倒立摆主要有直线式倒立摆、旋转式倒立摆、平面倒立摆等。选取旋转式倒立摆作为研究对象,介绍了系统的机械结构部分,通过分析力学中的拉格朗日法建立了系统的数学模型,研究了两种现代控制算法在旋转式倒立摆系统中的应用：极点配置法及LQR法,并运用MATLAB和SIMULINk工具在两种方法下进行了仿真实验,仿真结果表明：这两种算法在旋转式倒立摆系统的控制中都是可行的,而且效果令人满意。     

Adaptive beam search lookahead algorithms for the circular packing problem

This paper addresses the circular packing problem (CPP), which consists in packing n circles C_i, each of known radius r_i, i∈N={1, …, n}, into the smallest containing circle C. The objective is to determine the radius r of C as well as the coordinates (x_i, y_i) of the center of C_i, i∈N. CPP is solved using two adaptive algorithms that adopt a binary search to determine r, and a beam search to check the feasibility of packing n circles into C when the radius is fixed at r. A node of level ?, ?=1, …, n, of the beam search tree corresponds to a partial packing of ? circles of N into C. The potential of each node of the tree is assessed using a lookahead strategy that, starting with the partial packing of the current node, assigns each unpacked circle to its maximum hole degree position. The beam search stops either when the lookahead strategy identifies a feasible packing or when it has fathomed all nodes. The computational tests on a set of benchmark instances show the effectiveness of the proposed adaptive algorithms.     

超前瓦斯排放钻孔有效排放半径的测定

介绍了煤层超前钻孔的防突机理,比较和分析了超前瓦斯排放钻孔有效排放半径的3种测定方法,选择钻屑量与钻屑瓦斯解吸指标法进行了现场应用。应用结果表明,使用钻屑量与钻屑瓦斯解吸指标法测定排放钻孔的有效排放半径简便易行,准确可靠。     

移动可伸缩三维倒立摆模型的双足机器人步态控制策略

双足机器人的步态控制策略是保证双足稳定行走的重要条件之一.结合人在行走时ZMP平稳移动的特性,建立了一种移动可伸缩三维倒立摆模型;在约束平面内分析ZMP与COG的运动关系,将ZMP和COG分别定为快变因子和慢变因子,提出了移动可伸缩三维倒立摆模型的双足机器人步态控制策略;最后通过Matlab/ADAMS进行了步态控制仿真研究.仿真结果表明双足机器人可以稳定地行走,验证了该步态控制策略的可行性.     

圆锥壳开孔与围栏加强力学特性分析

圆锥壳由于锥角的存在,其开孔的力学特性比圆柱壳开孔更为复杂.通过有限元方法分析圆锥壳半锥角对开孔应力集中系数的影响,认为开孔偏斜角越大,导致的应力集中系数越大;并在此基础上,研究了圆锥壳开孔大小α/R对应力集中系数的影响规律.并分析了加强围栏的长度变化对孔应力集中系数的影响,表明围栏是圆锥壳开孔加强的有效措施.     

DFT and TD-DFT theoretical studies on photo-induced electron transfer process on [Cefamandole].C60 nano-complex

The C₆₀ fullerene displays a considerable electronegativity. It has a unique photophysical and electrochemical behavior that can be used as a suitable drug carrier. In the present study, the interaction of C₆₀ fullerene as an electron recipient with the Cefamandole antibiotic was investigated in both ground and excited states using DFT and TD-DFT methods. The study of the interaction of C₆₀ and Cefamandole via electron localization function (ELF) and reduced density gradient (RDG) revealed that the complex formation is of van der Waals type. The data from natural bonding orbitals (NBO) analysis also confirmed the interaction type. The study of absorption and emission spectrum via CAM-B3LYP in the TD-SCF state showed that the emission peak of C₆₀ fullerene in the 591.73 nm after the complex formation results in the extinction of this emission spectrum due to charge transfer (CT) from chelator to fluorophore. The photoinduced electron transfer (PET) process was investigated using the electron hole theory.