基于空间微螺线管的金属颗粒检测研究

目前电感式线圈检测方式均是基于线圈的电感信号,对铁磁性颗粒的检测精度可达到粒径19μm,但对非铁磁性金属颗粒一直在100μm以上。基于颗粒在通过电感式线圈的时候能同时引起线圈电感和电阻的变化,以及二者都随线圈激励电源频率变化而改变原理,建立粒径为108μm的球形铁、铜颗粒在1 V、1 MHz的激励电源下的磁场模型,分析阻抗信号随线圈电流频率的变化,研究利用电阻信号提高非铁磁性颗粒的检测精度,并通过实验验证:当频率由0.2 MHz增加到2 MHz,铜颗粒电阻信号由0.005 5Ω增加到0.6Ω,电感信号由-0.000 4μH降低到-0.011 5μH,铁颗粒电阻信号由0.008Ω增加到0.3Ω,电感信号由0.43μH降低到0.38μH;相同频率变化范围内,铜颗粒的电阻变化为铁颗粒的2.04倍,铜颗粒的电感变化为铁颗粒的22.2%;利用2 MHz激励电源检测电阻值变化提高了非铁磁性颗粒的检测精度,检测得到最小粒径为20μm的铜颗粒。     

发光织物的技术发展

通过检索发光纺织品的专利公开文件,分析了目前发光织物的织造方法及其各自的特点,并对发光织物开发可探索的方向进行了展望,以期促进发光织物的舒适性研究及应用领域研究。     

现代企业人力资源管理部门的任务

当今社会企业之间的竞争很大程度上是人才的竞争。企业经营规模的扩大、经营领域的拓展、企业的综合发展取决于企业人力资源的保障。为此，现代企业的人力资源管理部门的主要任务是按照企业发展总体规划，做好人力资源发展战略规划，重视关键岗位的人力资源的梯队建设，设计更为科学合理的薪酬、晋升、激励机制，激励员工积极向上，使企业的人力资源管理满足企业持续发展的需要。     

Diameter协议的实现——Opendiameter软件体系结构分析

Diameter协议是IETF的AAA(认证、授权、记费)工作组针对RADIUS协议的不足,提出的下一代AAA协议,设计之初就充分考虑了可扩展性、移动性和安全性,必将在移动IP尤其是MIPv6中得到广泛应用。Opendiameter是IETF组织人员开发的开源软件,实现了Diameter协议,并为进一步的开发提供了API(应用编程接口)。文中描述了Diameter基础协议和部分应用协议,并在此基础上,重点分析了Opendiameter的体系结构、线程观、基本信息处理和提供的C API。     

The Experiment of Obtaining Micron Beam in the Single-Particle Microbeam Facility of the Institute of Plasma Physics

The Experiments, methods and results of obtaining micron beam in the Microbeam Facility of the Institute of Plasma Physics were discussed in this paper. The H2^ beam was accelerated by the Van de Graa/f electrostatic accelerator, and the collimator at the end of the beam line is a 60μm thick stainless steel chip. And as a result, particle tracks on the solid track probes (CR39 film) etched in the solution of NaOH showed that the beam can go through the collimator with a small aperure (2000, 300, 55, 30, or 10μm) and 3.5μm thick vacuum film(Mylar). Besides the CR39 method, the beam was measured by an energy spectrum detector after the 10μm diameter aperture and the 3.5 μm thick vacuum film too.     

The Progress of a Microbeam Facility in the Institute of Plasma Physics

The progress of a microbeam facility in the institute of Plasma Physics was discussed in this paper.This kind of equipment can supply single-particle beam which may be implanted into cells in micrometer-radius and measured by a new outstanding detector among global microbeam systems.Measurements by some plain targets showed that the highest current after the accelerator tube can be larger than 20μA ,the H2^ current before the second bending magnet is near 0.9μA ,the current after the second bending magnet is near 0.8μA,and the current of the beam line(after a 2-mm diameter aperture)is near 0.25nA which is enough for the single-particle microbeam experiment.It took scientists 3 months to do their microbeam experiment after setting up the qccelerator beam line and get the microbeam from this equipment.Two pre0collimators were installed between the 2-mm diameter aperture and the collimator to survey the beam.Tracks on the CR39 film ectched in the solution of NaOH showed that the beam can go through the collimator including a 10μm diameter aperture and the 3.5μm thick vacuum sealing film(Mylar).A new method,which is called optimization of the beam quality,was put forward in this paper,in order to get smaller diameter of beam-spot in microbeam system.     

轻型商用车驾驶室声场特性分析

建立了驾驶室的三维有限元模型,并进行了结构模态分析;建立了驾驶室声学有限元模型以及声固耦合模型,通过对其声学模态及耦合模态进行分析,对驾驶室声场有了初步了解.对驾驶室进行谐响应分析,得到位移结果文件,为后续声场分析提供了边界条件。利用Sysnoise声学软件计算驾驶员耳旁声压曲线,并进行声学灵敏度分析,深入研究引起驾驶室内噪声的原因。采用边界元法分析了驾驶室各板件声学贡献,确定了地板为声学贡献量最大的板件。在以上研究的基础上,通过加强地板刚度对驾驶室进行修改。     

水库岩石风化料心墙堆石坝原型观测设计

由于岩石风化料心墙堆石坝的设计和施工迄今仍以经验性为主,原型观测可视为经验的源泉,受到国内外专家的广泛重视。文中将结合近年设计的某水电站心墙堆石坝原型观测设计,在资金非常有限的条件下,紧密结合本工程特点,力求监测仪器少而精,监测重点突出,观测项目全面,为工程安全运行提供可靠依据。     

基于激光测距仪的起重机检验装置

起重机在当前工业生产中作为一种搬运物料的常用设备,依据相应的法律法规对其进行检验检测是保证安全生产的基本前提与必要保证.现有的起重机检验方法自动化程度低,测量误差较大.针对现有的这些检验检测工作中存在的问题,文中在总结大量现场工作的基础上,结合分析现有的检验检测手段的优缺点,提出一套基于激光测距仪的便携式型式试验检测装...