理想开关SPICE宏模型的设计

讨论了SPICE程序对于电流控制开关电路模拟的问题。模拟DC-DC转换器、大功率开关和大功率电路系统的关键在于找出SPICE程序能接受的代替开关元件,文章给出了建立理想开关SPICE宏模型的方法和多种电压控制开关、电流控制开关的子电路模型。该方法简便易懂,在电路系统的设计仿真中有良好的应用价值。     

Organoplatinum crystals for gas-triggered switches

Considerable effort is being devoted to the fabrication of nanoscale devices. Molecular machines, motors and switches have been made, generally operating in solution, but for most device applications (such as electronics and opto-electronics), a maximal degree of order and regularity is required. Crystalline materials would be excellent systems for these purposes, as crystals comprise a vast number of self-assembled molecules, with a perfectly ordered three-dimensional structure. In non-porous crystals, however, the molecules are densely packed and any change in them (due, for example, to a reaction) is likely to destroy the crystal and its properties. Here we report the controlled and fully reversible crystalline-state reaction of gaseous SO2 with non-porous crystalline materials consisting of organoplatinum molecules. This process, including repetitive expansion-reduction sequences (on gas uptake and release) of the crystal lattice, modifies the structures of these molecules without affecting their crystallinity. The process is based on the incorporation of SO2 into the colourless crystals and its subsequent liberation from the orange adducts by reversible bond formation and cleavage. We therefore expect that these crystalline materials will find applications for gas storage devices and as opto-electronic switches.     

光导开关在超宽带雷达中的应用

超宽带雷达以其高距离分辨率、强抗干扰性、反隐身等优良特性受到各国日益广泛的关注.本文简要介绍了超宽带雷达的特点,阐述了光导开关在超宽带雷达中的应用以及国内外研究现状,并探讨了其应用前景.     

光导开关在UWB和THz技术中的应用

光导开关以其优良的性能在众多领域中有着广阔的应用前景和使用价值.本文重点阐述了光导开关在超宽带技术和太赫兹技术中的应用,并指出目前应用研究中存在的主要问题.     

MEMS开关中氮化硅薄膜工艺研究

分析了沉积薄膜厚度、PECVD的薄膜沉积温度、反应气体形成的杂质以及多层薄膜之间热应力匹配等因素对薄膜残余应力的影响.应用光刻分割聚酰亚胺(PI)牺牲层、分层生长氮化硅薄膜及快速热退火等工艺减小薄膜残余应力,成功生长出了合格的氮化硅薄膜.     

基于NRST的需求过程调度

在介绍网络式软件基本概念的基础上将网络式软件的需求状态(NRS)划分为6个状态,在需求工程的全过程中,采用需求状态跟踪(NRST)图刻画出各个需求状态之间的转化,并有效地利用NRST实现网络式软件需求过程的自动转换与调度,使整个需求分析过程能够在Internet网上自动完成.     

量子限制斯塔克效应及其在光开关中的应用

介绍了量子限制斯塔克效应(QCSE)的主要内容,给出了QCSE在快速2×2Mach-Zehnder光空间开关中的应用,并通过光开关性能的分析,指出用矩形量子阱结构的光开关的缺点,最后提出采用FACQW'S的解决办法。     

交换机中周期流优化调度问题的复杂性

研究了交换机中周期流量的优化调度问题,着重讨论了该问题的复杂性.依据呼损率定义了交换机周期流量调度的最优化问题,并对其子问题,嵌套周期流优化调度的复杂性进行了研究.证明了一种受限Max2Sat问题的NP完全性,并通过将该问题多项式归约到交换机周期流量调度的最优化问题,由此证明了仅有1和2周期的交换机周期流优化调度问题是强NPC问题.并利用该结果证明了任意嵌套周期的优化调度问题也是强NPC的.这表明对于任意嵌套周期流优化调度问题不存在伪多项式算法.     

Tunnel field-effect transistors as energy-efficient electronic switches

Power dissipation is a fundamental problem for nanoelectronic circuits. Scaling the supply voltage reduces the energy needed for switching, but the field-effect transistors (FETs) in today's integrated circuits require at least 60 mV of gate voltage to increase the current by one order of magnitude at room temperature. Tunnel FETs avoid this limit by using quantum-mechanical band-to-band tunnelling, rather than thermal injection, to inject charge carriers into the device channel. Tunnel FETs based on ultrathin semiconducting films or nanowires could achieve a 100-fold power reduction over complementary metal-oxide-semiconductor (CMOS) transistors, so integrating tunnel FETs with CMOS technology could improve low-power integrated circuits.     

光分组交换的最小开销调度法

在光交换机中调度光分组时，其核心问题是找到一种调度算法以使分组在交换机中的时延最小（其时延包括业务实际通过交换机所需要的时间以及配置交换矩阵所用的开销）。针对上述问题，提出了一种基于漏桶的新算法-业务穷尽匹配（traffic exhaust matching，TEM）算法，其时间复杂度为O（N^2），并能实现100％的吞吐量。与已有的ADJUST和DOUBLE算法比较，仿真表明TEM在时间复杂度及传输时延方面更具有优越性。     

机械式振动保护开关的设计

阐述了机械式振动保护开关的结构及受力分析，提供了设计方法和实例，并通过试验研究结果验证了设计计算值．     

光分组交换的最小开销调度法

在光交换机中调度光分组时%其核心问题是找到一种调度算法以使分组在交换机中的时延最小（其时延包 括业务实际通过交换机所需要的时间以及配置交换矩阵所用的开销）。针对上述问题%提出了一种基于漏桶的新 算法--业务穷尽匹配（traffic exhaust matching,TEM）算法,其时间复杂度为O（N²）,并能实现!100%的吞吐量。 与已有的ADJUST和DOUBLE算法比较,仿真表明TEM在时间复杂度及传输时延方面更具有优越性。     

Binary switches and modification cassettes in histone biology and beyond

An immense number of post-translational modifications on histone proteins have been described and additional sites of modification are still being uncovered. Whereas many direct and indirect connections between certain histone modifications and distinct biological phenomena have now been established, concepts for comprehending the extreme density and variety of these covalent modifications are lacking. Here, we formally introduce localized 'binary switches' and 'modification cassettes' as new concepts in histone biology, elucidating mechanisms that might govern the biological readout of distinct modification patterns. Specifically, our hypotheses provide missing models for the dynamic readout of stable histone modifications and offer explanations for several long-standing questions embedded in the literature. Our ideas might also apply to non-histone proteins and are open to direct experimental examination.     

最长连续切换的长度

作为一类简单的数学模型,均匀硬币的独立抛掷模型在诸多领域具有广泛的应用,关于其最长连续头部长度的研究长期吸引着学者们进行研究。时至今日,仍有大量的研究致力于这个问题的推广、相关问题及其应用。在本文中,我们将研究最长连续切换的长度,给出几个极限定理。这些结果可能应用到可靠性理论、生物、质量控制、模式识别、金融等领域。     

基于ARM的语音控制开关设计

给出了一种基于ARM处理器的语音控制开关,这种开关通过采用基于统计模型的半连续隐马尔科夫模型,实现了开关命令的识别和检出,进而实现控制电器开关的通断.与传统的触摸式或简单的声控开关相比,语音控制开关具有智能化、非接触、操控准确等优点,因此,在工业设备控制和家用电器控制等很多领域都具有广泛的应用前景.