Design and prototyping of Stark atom chip for electric trapping of laser-cooled atoms

An electric trapping of laser-cooled neutral strontium (Sr) atoms on a chip with micro-electrodes has been successful. The device is called “Stark atom chip” since it makes use of Stark effects on neutral atoms in electric fields. In this paper, our design and prototyping of the Stark atom chip with high aspect ratio electrodes precisely built on a surface are described. The functional requirements of the chip are specified during the discussion of designing the device. The authors design a novel process for fabrication of high aspect ratio electrodes. A focused ion beam (FIB) is used for precision fabrication of the prototype.     

Calibration of a Thomson parabola ion spectrometer and Fujifilm imaging plate detectors for protons, deuterons, and alpha particles

A Thomson parabola ion spectrometer has been designed for use at the Multiterawatt (MTW) laser facility at the Laboratory for Laser Energetics (LLE) at the University of Rochester. This device uses parallel electric and magnetic fields to deflect particles of a given mass-to-charge ratio onto parabolic curves on the detector plane. Once calibrated, the position of the ions on the detector plane can be used to determine the particle energy. The position dispersion of both the electric and magnetic fields of the Thomson parabola was measured using monoenergetic proton and alpha particle beams from the SUNY Geneseo 1.7 MV tandem Pelletron accelerator. The sensitivity of Fujifilm BAS-TR imaging plates, used as a detector in the Thomson parabola, was also measured as a function of the incident particle energy over the range from 0.6 MeV to 3.4 MeV for protons and deuterons and from 0.9 MeV to 5.4 MeV for alpha particles. The device was used to measure the energy spectrum of laser-produced protons at MTW.     

人体感应技术在智能电力机器人设计中的应用

为使机器人运作更灵活、功能更完善,提出在智能电力机器人设计方案中应用人体感应技术。以多光谱自动目标识别技术为基础,将 8 引脚芯片与部分外接元器件结合,组装人体感应装置。 采用全球定位系统与直接数字化 X 射线摄影导航系统,分别依据观测信号传播时间与起点坐标位置和方位角,实现机器人导航与航向控制功能。 在 1 个机器人上安装至少 2 个感应装置,针对形成的感应区域,定义装置基本功能,就不同电力应用场景,建立预警机制与躲避机制。 电力现场实际操作结果表明,设计的感应装置安全预警性能与物体躲避性能比较理想,加强了电力机器人的实用性,使其具备在其他领域中得以广泛应用的潜力与条件。     

An induction heater device for studies of magnetic hyperthermia and specific absorption ratio measurements

The development of a device for generating ac magnetic fields based on a resonant inverter is presented, which has been specially designed to carry out experiments of magnetic hyperthermia. By determining the electric current in the LC resonant circuit, a maximum intensity of magnetic field around of 15 mT is calculated, with a frequency around of 206 kHz. This ac magnetic field is able to heat powdered magnetic materials embedded in biological systems to be used in biomedical applications. Indeed, in order to evaluate the sensitivity of the device we also present the measurements of the specific absorption rate in phantoms performed with commercially prepared Fe(3)O(4) and distilled water at different concentrations.     

新型离心-脉冲电场联合破乳装置的设计

阐述了一种新型离心-脉冲电场联合破乳装置的设计和工作原理,提出整体设计方案和核心部件的结构形式.该装置可以实现"一机多能",开展不同破乳原理(离心场、脉冲电场、离心-脉冲电场)的实验,主要部件(电极、控制堰)结构尺寸可更换,脉冲电源的频率、脉宽、电压以及转鼓转速、流量等操作参数可调,可以开展不同组分、不同性质(含水量、液滴粒径等)乳状液的破乳试验.具有广泛的适用性、良好的操作性和分离效果.     

闭式液压行走系统在甘蔗联合收割机中的应用研究

闭式液压行走系统在农业机械设备,尤其在甘蔗联合收割机中广泛应用,论述了闭式液压行走系统的工作原理、调速的实现方法,提出了甘蔗联合收割机差速及同步驱动控制的实现思路,为推进闭式液压行走系统在农业机械的应用提供借鉴与参考。     

磁光薄膜电流传感器

磁光薄膜电流传感器，是基于磁致旋光介质在外磁场的作用下，对偏振光振动面的旋光原理、光导纤维对高压电场的隔离特性而设计的一种新型电流传感器。它可用于低压、高压和超高压配电网中，对直流、交流进行实时遥测和故障定位。     

Multiple species ion energy analyzer applied to laser-induced plasma experiments

We have developed a device which employs parallel dc electric and magnetic fields in combination with an array of collectors and accompanying electronic circuits to measure simultaneously the momentum distributions of different ion species from a laser produced plasma. This diagnostic system automatically separates the ion species according to mass to charge ratio and utilizes the cyclotron motion to provide the momentum separation. The principle of operation, design configuration, and circuitry for the system are presented along with representative data obtained from a series of laser-induced plasma experiments.     

小型工件尺寸外观检测定制化设备大有作为

在家用电器、手机零件、电子部件、稀土永磁材料等工业生产领域,存在大量的方片状、圆片形、圆环状等小型工件,这些小型工件的生产具有数量大、时间紧、精度高等要求,其质检现状一直面临严峻挑战.对此,定制检测设备却能做到轻松高效地全检,这种光、机、电一体化的高科技仪器可以全面替代人工,能为厂商大幅节省人力和管理成本,因此受到广泛关注.     

Design of Wien filters with high resolution

The design of a compact high-energy resolution device based on a symmetrical double Wien filter is presented. An accurate version of the boundary element method (BEM) is employed to model the shape and behaviour of the filters very precisely. Using a direct ray tracing technique, we investigate the geometrical aberrations in the basic filter, in which dipole and quadrupole electric fields and a dipole magnetic field are present. The additions of a quadrupole magnetic component along with some slight modifications in the geometry produce a drastic reduction in the aberrations.     

Characterisation of electronic and structural properties of thin silicon dioxide films by scanned probe microscopy

This paper concerns the application of scanned probe microscopy to the study of thin silicon dioxide films. We show how the formation of 7 nm diameter silicon carbide particles on a silicon surface during high temperature processing affects the quality of subsequently grown oxide. To measure the local dielectric properties of thin oxides we have developed a new type of probe measurement which allows high resolution surface imaging, based on an atomic force microscope, combined with local electrical measurements. The spatial resolution of the electrical measurements was shown to be < 40 nm. Applying the technique to 500 nm capacitors fabricated on device quality oxide it was shown that some capacitors broke down during imaging while others remained stable at electric fields up to 30 MVcm^?1. This higher breakdown strength may have substantial impact on future electronic device reliablity and performance.     

外电场中Ba原子6pnk自电离态光谱的测量

介绍了一种可调谐激光三步孤立实激发方式测量外电场中原子自电离态光谱的技术。利用该技术结合适当的激光偏振组合方式 ,系统地测量了大量的 Ba原子初态为 M=0和 |M|=1 Stark态的 6pnk自电离态光谱 ,并且对这些实验光谱进行了初步的分析。分析结果得出这些自电离态光谱由于电场的作用 ,它们之间产生了强烈的混和从而导致了它们线形的变化。     

Design and performance evaluation of a novel square ion trap with mass analysis in the radial a axial directions

A novel three-dimensional square ion trap is reported as a mass analyzer or an ion transfer device. The square ion trap was constructed with six square planar electrodes while the electric field was optimized by changing their relative positions to arrange the strength of higher-order fields. Ion trajectory simulations demonstrate the square ion trap efficiently operates with radial and axial excitation. Additionally, ions ejected from the radial direction contained lower kinetic energies and their energy distribution were more centralized. These properties may improve the ion transfer efficiency.     

波导的联接与电缆的密封

根据雷达结构设计中的一些典型实例。介绍了波导的联接方式和电缆密封装置的结构型式以及它们的特点和应用场合。针对波导的三种联接方式。用极大极小法对波导法兰的定位误差进行了计算。结果表明：与第一种国家标准上有规定的联接方式比较。后两种适用于波导快速装卸的联接方式,其定位精度较高,能满足电性能要求。     

航空刹车装置动力试验台电气传动系统的特点

主要介绍了新研制的航空刹车装置动力试验台的设备组成、电气传动系统配置、技术特点及主要参数设置。改造后的电气传动装置能够满足新机型的刹车试验要求。     

Using magnetic hysteresis for testing electroconductive objects in pulsed magnetic fields

The distributions of the electric voltage U(t) that is read from an induction magnetic head as it scans a discrete magnetic medium with residual magnetic field records that were obtained under the action of a pulsed magnetic field with different-polarity surges on a magnetic medium with a tested object are given. The onset of ordered distributions of the residual magnetic fields on the magnetic medium due to the sequential action on it by pulses of the magnetic field is called the hysteresis interference of a pulsed magnetic field (HI). The scheme of an experimental device for studying propagations of pulsed magnetic fields and methods of testing objects made of electroconductive and magnetic materials, which increase the accuracy of the determination of their specific conductivity σ, permeability μ, distribution uniformity of σ and μ, thickness, and parameters of continuous defects in them, are described.     

Pulsed ion cyclotron resonance mass spectrometer for studying ion-molecule reactions

A pulsed ion cyclotron resonance mass spectrometer utilizes the cyclotron resonance principle for mass analysis of ions trapped at low pressures by electric and magnetic fields. Both mass analysis and ion trapping are accomplished in a one-region device called a trapped ion analyzer cell. A pulsing sequence is described which allows for generation of ions by electron impact, reaction with added gases, and mass analysis of the products of ion-molecule reactions. Methods are described for measuring rate constants and equilibrium constants for ion-molecule reactions. The high ion trapping efficiency and open geometry of the analyzer cell make it well suited for studying the interaction of laser radiation with gaseous ions and may also be useful for high-accuracy isotope ration mass spectrometry.     

高效环保型螺旋平料系统的研发

根据散粒物料平整作业的需要,研发了一种以螺旋输送机输送物料为工作原理的高效环保型螺旋平料系统,实现敞车车厢内散粒物料的平整作业。该平料系统主要由螺旋平料机、支承门架、电气控制系统、安全保护装置及喷淋装置等部分组成,具有平料效果好、效率高、节能环保且自动化程度高的特点。样机试验结果表明,该平料系统完全满足散货码头与矿场散粒物料装载后敞车车厢的平整作业需求。     

A Mach-Zehnder interferometer for the detection and noninvasive optical amplification of polarization rotation

We present the theory and design of a Mach-Zehnder interferometer with orthogonally polarized arms that passively, noninvasively, optically amplifies polarization rotation in one arm of the interferometer. Theoretical analysis of the electric fields in the two arms is used to compare the significance of device optimizations. Design of the beam alignment, beam recombination, noise isolation, and active stabilization to enable reliable measurements are thoroughly discussed. Finally, we review a comparison between the interferometer with an optical gain factor of approximately 4.5 and the optical bridge (OB) technique for polarization rotation detection that shows the interferometer offers better performance than the OB.     

便携式挂装装置传动机构设计

便携式挂装装置用于将武器等被挂物从转运设备上升起,将其提升到所需的高度。其具有手动和电动模式,传动结构是重要组成部分,是挂装装置提升效率的关键。从便携式挂装装置的功能出发,对电动传动、手动传动部分及钢索排线传动部分及安全保护装置进行了设计,并提出了存在问题及改进方向。