嵌入式LINUX系统中触摸屏控制研究与实现

论文主要讨论了基于嵌入式Linux操作系统的研究与开发。文章对嵌入式系统进行了简单介绍，详细分析了系统特点，结合Linux自身的优点，提出了基于嵌入式Linux操作系统对触摸屏驱动的开发方案，并详细介绍了驱动程序及测试应用程序的设计．     

γ能谱分析中土壤探测效率与密度相关性计算分析北大核心CSCD

γ能谱分析中不同能量探测效率的准确校准是影响测量结果准确度的重要因素。本文基于国产无源效率计算软件Gammacalib对几种不同密度的土壤样品建模,计算相应的探测效率,与标准源实验测量的探测效率比较,验证无源效率计算的准确性。根据无源效率计算结果,分析相应探测效率与土壤密度的相关性,得到ε~ρ回归方程。对于土壤标准源,有源效率与无源效率之间的相对偏差在-7.6%~8.1%之间,效率与密度呈正相关,相关系数在0.938~0.992之间。国产无源效率软件Gammacalib探测效率计算结果与标准源实验测量结果相对偏差可接受,可满足日常辐射环境实验室样品测量和核事故应急监测要求,ε~ρ回归方程的适用性良好,可为环境土壤样品的密度差异效率修正提供参考。     

Research on optimized GA-SVM vehicle speed prediction model based on driver-vehicle-road-traffic system

The accurate prediction of vehicle speed plays an important role in vehicle’s real-time energy management and online optimization control. However, the current forecast methods are mostly based on traffic conditions to predict the speed, while ignoring the impact of the driver-vehicle-road system on the actual speed profile. In this paper, the correlation of velocity and its effect factors under various driving conditions were firstly analyzed based on driver-vehicle-road-traffic data records for a more accurate prediction model. With the modeling time and prediction time considered separately, the effectiveness and accuracy of several typical artificial-intelligence speed prediction algorithms were analyzed. The results show that the combination of niche immunegenetic algorithm-support vector machine (NIGA-SVM) prediction algorithm on the city roads with genetic algorithm-support vector machine (GA-SVM) prediction algorithm on the suburb roads and on the freeway can sharply improve the accuracy and timeliness of vehicle speed forecasting. Afterwards, the optimized GA-SVM vehicle speed prediction model was established in accordance with the optimized GA-SVM prediction algorithm at different times. And the test results verified its validity and rationality of the prediction algorithm.     

Multi-objective robust design optimization of a novel negative Poisson’s ratio bumper system

Negative Poisson’s ratio (NPR) structure has outstanding performances in lightweight and energy absorption, and it can be widely applied in automotive industries. By combining the front anti-collision beam, crash box and NPR structure, a novel NPR bumper system for improving the crashworthiness is first proposed in the work. The performances of the NPR bumper system are detailed studied by comparing to traditional bumper system and aluminum foam filled bumper system. To achieve the rapid design while considering perturbation induced by parameter uncertainties, a multi-objective robust design optimization method of the NPR bumper system is also proposed. The parametric model of the bumper system is constructed by combining the full parametric model of the traditional bumper system and the parametric model of the NPR structure. Optimal Latin hypercube sampling technique and dual response surface method are combined to construct the surrogate models. The multi-objective robust optimization results of the NPR bumper system are then obtained by applying the multi-objective particle swarm optimization algorithm and six sigma criteria. The results yielded from the optimizations indicate that the energy absorption capacity is improved significantly by the NPR bumper system and its performances are further optimized efficiently by the multi-objective robust design optimization method.     

MATLAB在化工模拟计算中的应用

通过MATLAB辅助绿色含硫气湿法直接脱硫制酸新工艺及SO2转化器的模拟计算实例,着重介绍和说明了MATLAB在化工模拟数值计算及最优化、数值过程及结果的可视化、用户图形界面设计等方面的功能与应用。化学工作者利用MATLAB语言,即使不善精通数值计算方法和其它高级编程语言,也完全可以设计出功能强大,界面优美,稳定可靠的高质量化工模拟程序,并且可实现模拟计算结果的可视化和用户图形界面的一体化。     

Detection of heroin covered by skin by using robust principal components analysis

Nowadays, body packing has become an increasingly important approach for trafficking drugs. In this paper, robust principal component analysis (PCA) was demonstrated as a promising suitable method to detect heroin covered by skin based on the profile of energy dispersive X-ray diffraction spectrum. Firstly, some potential impact factors were investigated. Results showed that the signal was optimized when the scatter angle of 8° and the count time of 1 min were chosen. Then, after being truncated, denoised and autoscaled, spectra of heroin, skin and heroin covered by skin were analyzed by robust PCA. Compared with classical counterpart, robust PCA effectively extracted principle components of samples, and successfully identified heroin covered by skin. Finally, based on Robust PCA, a method of identification was set up. This suggests that robust PCA can be employed in detecting drugs packed in body.     

产品合格证的编制摭谈

GB/T 14436-1993《工业产品保证文件》规定了工业产品保证文件编制的基本原则、主要内容及编制要求.所谓产品保证文件是产品生产者向产品用户提供的产品质量证明和服务保证等信息的技术文件总称,如产品质量证明书、产品合格证、产品退换证、产品保修单及产品信誉卡等.包括汽车、农用运输车等产品在内的诸多机动车产品在生产中大都是向用户提供产品合格证.然而,不少汽车、农用运输车生产企业的产品合格证都未认真贯彻实施GB/T 14436-1993,存在诸多缺陷.笔者将在本文中结合技术文件标准化审查实践经验及自身工作体会,谈谈产品合格证的基本要求及编制方法.     

煤炭企业基础设施循环利用模式探讨

在对煤炭企业基础高州界定和分类的基础上，分析了煤炭企业基础设施循环利用模式、探讨基础设施循环利用方式，旨在为煤炭企业发展循环经济提供有价值的参考。     

基于数据字典库的信息系统的设计

基于保险业务综合管理信息系统中应用软件的开发实践,介绍了采用数据驱动并通过建立数据字典库对系统进行管理的方法,同时介绍通过某些通用工具来支持信息系统设计的技术。最后针对ＭＩＳ的若干基本对象模型进行了讨论,并给出一个通用界面生成的例子。     

Rosemount现场总线仪表在5000t/d水泥生产线的应用研究

阐述了Rosemount现场总线PA仪表在我国水泥生产线的应用情况。东华水泥的SiemensPCS7V6.0DCS系统和Rosmount现场总线PA仪表的组合,攻克了现场总线仪表进入系统的地址分配、地址表填写、数据传输、零位调整等诸多困难,开创了国内水泥生产线的应用先例,取得了良好的效果。