可调波长半导体激光测量台阶高度方法研究

文章在分析台阶高度测量现状和背景的基础上,着重介绍了用半导体激光器实现台阶 高度的绝对干涉测量方案,提出以可调谐半导体激光器作为光源,采用可调合成波长链法实现纳米级精度毫米级量程的台阶高度测量,并详细分析了本方案的原理、误差。     

连续铸造球铁ADI在高密封节油环保活塞环上的应用

采用水平连铸球铁型材加工后经等温淬火获得ADI高密封节油环保活塞环,可保证汽车发动机综合节油率20%以上,并且,减少汽车尾气排放,利于大气环保,尾气指数远低于“欧Ⅱ”标准指标,经济效益及社会效益显著。     

ADI：宽带RFIC是实现WIFR的关键

宽带RFIC的定义是“能处理宽的信号频率范围、能被应用于多种频带中并支持多种终端应用。”宽带RFIC的主要应用包括有线／卫星电视、频谱分析仪、军事无线应用、雷达和无线基础设施。随着宽带通信产品应用的不断扩大,能够满足宽带应用的RFIC产品的重要性也在不断加强。能够为市场提供多少宽带RF信号链产品决定了公司能够在这一市场占据多大的地盘。“在RF领域超过15年的深耕,使得ADI成为全球唯一能够提供覆盖整个信号链RFIC的供应商。”ADI全球RF和网络部门副总裁Peter Real日前对EDN China表示,在坚持不断创新的努力下,ADI 40多年来一直在信号处理领域占据着重要位置。     

智能化机器：MEMS推动的第三次革命

MEMS在汽车和消费电子出．现滑坡的今天已开始向新领域扩张。最新的数据显示,MEMS的整体市场份额约为167亿美元。而与商业价值相比,其对人类技术革命新浪潮的推动作用和意义十分巨大。半导体厂商预言,MEMS实现的感知能力可能会使真正的智能机器成为现实。     

等温淬火球铁材料近期的进展与深化

自2002年第三届全国等温淬火球铁技术研讨会以来,国内外等温淬火球铁的技术研究、生产应用又有了许多新的进展。笔者就等温淬火球铁材料的性能特点、扩大应用、挤压铸造、数值模拟、轻量化等五个问题介绍一些情况,并概念性地论述一些观点,供从事这方面研究的同行参考。     

A spatially second order alternating direction implicit (ADI) method for solving three dimensional parabolic interface problems

A new matched alternating direction implicit (ADI) method is proposed in this paper for solving three-dimensional (3D) parabolic interface problems with discontinuous jumps and complex interfaces. This scheme inherits the merits of its ancestor for two-dimensional problems, while possesses several novel features, such as a non-orthogonal local coordinate system for decoupling the jump conditions, two-side estimation of tangential derivatives at an interface point, and a new Douglas–Rachford ADI formulation that minimizes the number of perturbation terms, to attack more challenging 3D problems. In time discretization, this new ADI method is found to be of first order and stable in various experiments. In space discretization, the matched ADI method achieves the second order accuracy based on simple Cartesian grids for various irregularly-shaped surfaces and spatial–temporal dependent jumps. Computationally, the matched ADI method is as efficient as the fastest implicit scheme based on the geometrical multigrid for solving 3D parabolic equations, in the sense that its complexity in each time step scales linearly with respect to the spatial degree of freedom $N$, i.e., $O\left(N\right)$. Furthermore, unlike iterative methods, the ADI method is an exact or non-iterative algebraic solver which guarantees to stop after a certain number of computations for a fixed $N$. Therefore, the proposed matched ADI method provides a very promising tool for solving 3D parabolic interface problems.     

新型层叠短接式微带蓝牙天线的仿真分析

为适应快速发展的蓝牙无线通信技术的要求,设计了新型层叠短接式微机械蓝牙天线,其10dB带宽达到了11%以上,辐射效率为68%,天线长度小于1/7 λ.首次将三维ADI-FDTD(the alternating direction implicit finite-difference time-domain)全波分析方法应用于该天线的建模和分析,数值模拟结果表明在计算域内网格尺寸相对于其它处网格尺寸或波长小得多的条件下,三维ADI-FDTD时域全波分析方法能更有效地模拟微机械微带蓝牙天线,并能有效地减少CPU计算时间.     

Investigation into mechanical properties of austempered ductile cast iron (ADI) in accordance with austempering temperature

This work concerns mechanical properties of an austempered ductile cast iron (ADI). Samples alloyed with copper and molybdenum were austenitized at 910 °C for 90 min and subsequently austempered in a salt bath over a range of temperatures from 350 °C to 410 °C to obtain favorable mechanical properties such as tensile strength, elongation, and fracture toughness. Those properties were compared from various austempering heat treatments.     

用于大、中功率增压柴油机曲轴的球铁材料

摘要：介绍了QT800-6／QT900-6高延性珠光体球铁和等温淬火球铁（ADI）等具有优良综合性能的曲轴材料,分析了其在增压柴油机曲轴上的应用前景。指出经强化的QT800-6／QT900-6高延性球墨铸铁曲轴,生产工艺技术稳定,产品一致性好,有广阔的发展前景;此外,由于目前ADI曲轴需求市场尚未形成,并受专业化等温淬火热处理设备投资较大的影响,ADI曲轴的发展受到很大制约。     

ADI铁路机车制动器耐磨件的试制

用牌号为QTD 1400-1的等淬球铁(ADI)试制了东风4B内燃机车制动装置用衬套等铸件,其球化率为2~3级、石墨球大小5~7级、珠光体体积分数大于80%,等淬热处理工艺为:880~920℃×1~2 h+240~280℃×1~2 h,热处理后金相组织为针状铁素体+富C奥氏体+球状石墨,力学性能检测结果为:抗拉强度1 460~1 510 MPa,伸长率1.6%~4%,硬度46.0~48.5 HRC。通过30万km行车试验证明,ADI衬套等耐磨件可以满足内燃机车制动装置的服役使用要求,在相同工况条件下的磨耗是原来钢衬套的1/3~1/5。