沿海深基坑工程高压旋喷桩施工质量控制

珠海城际轨道工程湾仔车站深基坑工程采用高压旋喷桩止水帷幕,通过精心施工,较好的完成施工任务,该工程的施工质量控制措施可为同类深基坑工程提供宝贵意见。     

对贵阳市小城镇建设中一些关键要素的分析和思考

当前贵州省正在全面建设示范小城镇,贵阳市是这一轮小城镇建设的重点区域.作者结合城乡规划理论与工作实践,对贵阳市小城镇建设中一些关键要素进行了思考,对小城镇规划和建设的指导思想提出了明确的观点,对小城镇建设中一些重要项目和成功经验进行了简要归纳和分析,对小城镇镇区规划和建设中的一些技术难点提出了具体的工作建议.     

基于ANSYS与moldflow的仪器上盖注塑成型模拟

在注塑成型过程中,冷却是重要环节,模具温度是影响成型品质量的关键因素之一,在此以仪器上盖为例,运用ANSYS进行模具瞬时传热分析,获取热交换过程中模具温度分布特性,再利用moldflow进行熔体成型流动及冷却模拟,预测并消除注塑成型过程中可能发生的问题,最后实现产品成型过程的模拟试模,为模具设计和实际生产工艺提供参考依据.     

Optimal linear attitude estimators via geometric analysis

Three optimal linear attitude estimators are proposed for single-point real-time estimation of spacecraft attitude using a geometric approach. The final optimal attitude is represented by modified Rodrigues parameters (MRPs). After introducing incidental right-hand orthogonal coordinates for each pair of measured values, three error vectors are obtained by the use of dot or/and cross products. Corresponding optimality criteria are rigorously quadratic and unconstrained, which do not coincide with Wahba’s constrained criterion. The singularity, which occurs when the principal angle is close to π, can be easily avoided by one proper rotation. Numerical simulations show that the proposed three optimal linear estimators can provide a precision comparable with those complying with the Wahba optimality definition, and have faster computational speed than the famous quaternion estimator (QUEST).     

基于步进电机的流苏丝线绕制机智能控制器的设计

针对流苏丝线绕制过程中对动力机构的控制要求,系统设计以ATMEL89S52系列单片机为核心控制器,采用SANY0步进电机作为动力机,利用东芝公司的TB6560AHQ步进电机细分驱动器和ATMEL公司的I2C总线器件AT4C02芯片对系统掉电时的实时速度、圈数和转向等数据进行保护,实现了丝线绕制过程中对力矩、转向、速度、圈数和捻度等参数的精确控制,减轻了工人的劳动强度,提高了流苏的生产质量和效率.     

3D Reconstruction technique for tomographic PIV

Tomographic particle image velocimetry(Tomo-PIV) is a state-of-the-art experimental technique based on a method of optical tomography to achieve the three-dimensional(3D) reconstruction for threedimensional three-component(3D-3C) flow velocity measurements. 3D reconstruction for Tomo-PIV is carried out herein. Meanwhile, a 3D simplified tomographic reconstruction model reduced from a 3D volume light intensity field with 2D projection images into a 2D Tomo-slice plane with 1D projecting lines, i.e., simplifying this 3D reconstruction into a problem of 2D Tomo-slice plane reconstruction, is applied thereafter. Two kinds of the most well-known algebraic reconstruction techniques, algebraic reconstruction technique(ART) and multiple algebraic reconstruction technique(MART), are compared as well. The principles of the two reconstruction algorithms are discussed in detail, which has been performed by a series of simulation images, yielding the corresponding reconstruction images that show different features between the ART and MART algorithm, and then their advantages and disadvantages are discussed. Further discussions are made for the standard particle image reconstruction when the background noise of the pre-initial particle image has been removed. Results show that the particle image reconstruction has been greatly improved. The MART algorithm is much better than the ART. Furthermore, the computational analyses of two parameters(the particle density and the number of cameras), are performed to study their effects on the reconstruction. Lastly, the 3D volume particle field is reconstructed by using the improved algorithm based on the simplified 3D tomographic reconstruction model, which proves that the algorithm simplification is feasible and it can be applied to the reconstruction of 3D volume particle field in a Tomo-PIV system.     

高等院校物理化学课程教学实践的研究

物理化学是高等院校一些专业的重要课程,在学生素质教育的过程中起重要作用。目前在教学中仍存在着很多深层次的问题需要解决。作者结合多年教学实践,从精选教学内容、改进教学方法、多种考核方式相结合等方面,探讨如何改善教学中所面临的问题,培养学生的逻辑思维能力,在教学过程中培养创新型人才,提高物理化学课堂教学质量。     

现阶段我国公安院校人才培养存在不足与路径探索

我国公安院校从建立开始,就一直承担着为公安机关输送人才的重要任务。作为公安后备人才的培养单位,公安院校培养人才的质量高低关系到我国公安队伍的健康发展和壮大。在新时期,由于社会的发展和变化,公安院校人才培养模式也要改革与创新,以适应我国公安机关对公安人才的要求,适应公安机关的发展。     

国内电子商务信息生态链理论研究分析与对策

近十年来电子商务信息生态链的研究一直是学者们相继研究的热点.论文通过统计和归纳的方法,对国内相关的文献进行分类和总结,试图揭示目前国内电子商务信息生态链理论研究的现状,指出其存在的不足,并提出加强学术交流与合作、定性研究与实证研究相结合以及创建核心研究群从而推动核心影响力这三条改进策略.     

公路机械设备信息管理系统设计

本文通过对依托单位现行机械设备管理现状的分析,结合实际的管理流程及用户需求,提出了公路机械设备信息管理系统的设计思想。并利用面向对象的可视化编程工具VB.NET和SQL server2000数据库进行编程,完成了设备信息管理系统的设计。系统对设备进行在线跟踪式管理,将管理人员和操作人员的实际工作纳入管理方案。通过统一的管理方式和规范的管理流程,减轻了管理工作量,同时又提高了工作效率。本系统功能齐全,接口友好,具有较好的实用价值。