基于FLAC3D的黄土基底排土场稳定分析

我国大型露天煤矿主要分布在西北部的黄土高原地区,以黄土为基底的排土场形成后,黄土基底的工程性质将发生改变并形成演化弱层,演化弱层对排土场边坡稳定性起到控制作用,由于弱层的存在,边坡容易形成"坐落-滑移式"破坏。本次分析是基于强度折减理论,应用FLAC3D对排土场边坡变形进行数值模拟,展现出排土场边坡变形机理。依据数值模拟结果,获得排土场边坡的最危险滑面和多处潜在滑动面。为排土场边坡失稳的预测及防治工作提供科学依据。     

浅谈剪纸艺术在高校景观中的应用

高校校园环境日趋园林化、景观化、生态化,校园景观文化建设正在逐步加强,但是对于民间艺术部分几乎还没有应用,文章正是以此为切入口,把剪纸艺术的表现形式融合在校园景观中,对民间艺术进入高校景观做了一个铺垫,同时为非物质文化遗产的保护和传承寻找了一个更为广阔的空间。通过剪纸的艺术特色,分析剪纸应用在校园景观中不仅美化了环境,同时增加了学生对传统文化的理解,潜意识的唤醒学生对非物质文化遗产的保护。     

玻璃深加工计算机辅助管理系统的研究开发

针对玻璃深加工企业提出的信息化管理需求,通过深入研究分析玻璃深加工流程中需要信息化的各个环节,开发出一个计算机辅助管理系统.系统中本地采用C/S网络体系结构,异地数据通过zlibEx压缩后通过串口实现远程实时安全传输.系统中只需在生成订单时一次输入原始数据,其它功能模块共享原始数据,自动生成各种所需的报表.采用改进的启发式动态寻优方法实现优化切割,改变了手工排料,提高了玻璃原片利用率.该管理系统投入使用后,企业员工的工作效率和经济效益都明显提高,表明了该管理系统的有效性和可行性.     

The generalized assortment and best cutting stock length problems

This paper introduces two new one-dimensional cutting stock models: the generalized assortment problem (GAP) and the best cutting stock length (BSL) problem. These new models provide the potential to reduce waste to values lower than the optimum of current models, under the right management circumstances. In the GAP, management has a standard length and can select one or more of any additional custom stock lengths, and management wishes to minimize cutting stock waste. This model is different from existing models that assume that the selection is from a small fixed set of stock lengths. In the BSL problem, management chooses any number of custom stock lengths, but wishes to find the fewest custom stock lengths in order to have zero waste. Results show waste reductions of 80% with just one custom stock length compared with solutions from standard cutting stock formulations, when item lengths are long relative to the stock length. The models are most effective when the item lengths are nearly as long as the stock length. Solutions from the model have been implemented for a manufacturer. The model is easily generalized to allow multiple existing stock lengths and different costs.     

Solving the irregular strip packing problem via guided local search for overlap minimization

The irregular strip-packing problem (ISP) requires a given set of non-convex polygons to be placed without overlap within a rectangular container having a fixed width and a variable length, which is to be minimized. As a core sub-problem to solve ISP, we consider an overlap minimization problem (OMP) whose objective is to place all polygons into a container with given width and length so that the total amount of overlap between polygons is made as small as possible. We propose to use directional penetration depths to measure the amount of overlap between a pair of polygons, and present an efficient algorithm to find a position with the minimum overlap for each polygon when it is translated in a specified direction. Based on this, we develop a local search algorithm for OMP that translates a polygon in horizontal and vertical directions alternately. Then we incorporate it in our algorithm for OMP, which is a variant of the guided local search algorithm. Computational results show that our algorithm improves the best-known values of some well-known benchmark instances.     

基于STM32的手持式测氧仪设计

针对国内传统手持式测氧仪精度低、功耗高的问题,提出了采用嵌入式微控制器STM32F103RBT6作为控制芯片的手持式测氧仪.该仪器通过控制元器件的开断来降低待机功耗,根据所测浓度人工切换系统放大倍数,通过键盘设置时间和报警值等相关参数.算法上采用中位值平均滤波算法进行软件滤波,结合传统两点标定法和多点标定法的优缺点,采用多点标定法进行氧浓度标定,采用分段斜率拟合算法计算氧浓度值.经实验测试证明设计的手持测氧仪具有高精度和高稳定性.     

瞬变电磁法在变电站地质物探中的应用

在电力系统地质探测方面,为了查明引发滑坡的地质形态特征,简要介绍了瞬变电磁法(TEM)的工作原理及其探测方法,并以滇东北区某变电站周边边坡进行探测为例,通过对视电阻率成像图进行分析,得到了视深断面图的地形特征,总结了地质形态的分布情况.与传统的电阻率法相比,瞬变电磁法能够高效、简便地运用在山地环境的地质物探中.     

大坡降复合式水平旋流内消能泄洪洞阻塞扩散段试验研究

以两河口水电站3#导流洞改建为复合式大坡降水平旋流内消能泄洪洞为例,对大坡降水平旋流洞末端和导流洞之间的衔接方式进行了试验研究。提出了阻塞渐扩和阻塞突扩两种不同的衔接方式,并对两种旋流扩散体型局部流态及壁面压强、断面掺气浓度、旋流扩散轨迹等水力特性进行了量测与分析,得到各体型旋流扩散段流态及各项水力特性随上游水位变化的基本规律。     

峰值电流模升压转换器的动态斜坡补偿电路设计

基于HHNEC 0.35 μm BCD工艺设计了一种应用于峰值电流模升压转换器的动态斜坡补偿电路.该电路能够跟随输入输出信号变化,相应给出适当的补偿量,从而避免了常规斜坡补偿所带来的系统带载能力低及瞬态响应慢等问题.经Cadence Spectre验证,该电路能够达到设计要求.     

单一尺寸矩形毛坯排样时长板的最优分割

讨论了存在剪刃长度约束时单一尺寸矩形毛坯的优化排样问题,将板材分割成多张子板,通过优化确定子板张数、各子板长度和毛坯在各子板上的排列,使事 板材中所含毛坯数达到最大;并对Agrawal提出的单一尺寸矩形毛了优化排样方法进行扩展,构造出一种分支定界方法,用于解决长板最优分割问题,实验计算结果表明,所述算法非常有效;最后给出了例题数据的排样结果,与企业的通常做法相比较,说明了采用本方法的节材潜力。