一种绿色环保待机控制电路分析

介绍了一种节能电路,对电源进行简单管理,在待机时停止对主IC供电,达到待机功耗的最小化.利用电视机遥控的编码规则,在引导码的4.5 ms低电平时间打开电源开关,给系统供电.     

一种峰值功耗约束下的SoC蚁群测试调度算法

基于扫描链技术的SoC芯片测试可产生比正常使用模式下更大的功耗,这将会对器件可靠性产生不利影响,故在测试时需要将芯片测试功耗控制在允许峰值功耗之下.文中采用蚁群优化思路设计SoC测试调度算法,用于在峰值功耗和TAM总线最大宽度约束下降低SoC测试时间.实验结果表明,本方法优于先前已发表的相关方法.     

数字集成电路物理设计阶段的低功耗技术

通过一个图像处理SoC的设计实例,着重讨论在物理设计阶段降低CMOS功耗的方法.该方法首先调整PAD摆放位置、调整宏单元摆放位置、优化电源规划,得到一个低电压压降版图,间接降低CMOS功耗;接着,通过规划开关活动率文件与设置功耗优化指令,直接降低CMOS功耗.最终实验结果表明此方法使CMOS功耗降低了10.92%.基于该设计流程的图像处理SoC已经通过ATE设备的测试,并且其功耗满足预期目标.     

无线照明系统休眠策略的研究与实现

为解决传统无线控制系统在空闲时仍处于完全功耗状态,造成能源利用率低的问题,提出一种基于休眠唤醒策略的节能机制。首先,网络采用有利于节点休眠的网状拓扑结构,通过节点配置,保证网络通信在节点休眠期间的可靠性;其次,休眠节点按照其功能要求,分别采用了事件驱动和定时唤醒的机制,在满足使用要求的情况下,最大限度地减低功耗;最后,根据相关数据对上述休眠机制进行分析研究,验证其有效性和可用性。     

Optimal portfolio‐consumption choice under stochastic inflation with nominal and indexed bonds

This research solves the intertemporal portfolio choice problems with and without interim consumption under stochastic inflation. We assume a one‐factor nominal interest rate and a one‐factor expected inflation rate, implying a two‐factor real interest rate in the economy. In contrast to other related research which adopts the one‐factor real interest rate model, the inflation‐indexed bond is not a redundant asset class even in a complete market. The infinitely risk‐averse investor would prefer to invest all her wealth in inflation‐indexed bonds maturing at the investment horizon. We also show that, with the two‐factor real interest rate model, the consumption‐wealth ratio is not determined by the real interest rate alone. The investor's consumption–wealth ratio is also affected by the nominal interest rate and expected inflation rate levels. The capital market is calibrated to U.S. stocks, bonds, and inflation data. The optimal weights show that aggressive investors hold more nominal bonds in order to earn the inflation risk premiums, while conservative investors concentrate on indexed bonds to hedge against the inflation risk. Copyright © 2011 John Wiley & Sons, Ltd.     

Improvement on the dynamical performance of a power bipolar static induction transistor with a buried gate structure

The failure of a bipolar static induction transistor(BSIT) often occurs in the transient process between the conducting-state and the blocking-state,so a profound understanding of the physical mechanism of the switching process is of significance for designing and fabricating perfect devices.The dynamical characteristics of the transient process between conducting-state and blocking-state BSITs are represented in detail in this paper.The influences of material,structural and technological parameters on the dynamical performances of BSITs are discussed. The mechanism underlying the transient conversion process is analyzed in depth.The technological approaches are developed to improve the dynamical characteristics of BSITs.     

工业泛在传感网络信息融合机制下的能耗研究

工业复杂系统运行中产生的状态信息是测控系统稳定性——系统诊断的重要数据。采用工业泛在无线传感器网络可实时采集多组件的海量状态信息,而信息融合技术能够降低海量测量数据的模糊度,提升系统诊断准确度。本文研究不同融合机制下传感器网络能耗,推导出T时间内网络能耗理论计算公式。通过传感器网络实验系统平台实测分析表明,相同能耗参数的归一化实验数据与理论计算结果吻合较好。实验数据指出,Relay传输需要采取必要冗余机制,避免节点能耗不均衡性引起网络传输性能振荡。     

Evolution of dispersive liquid–liquid microextraction method

Dispersive liquid–liquid microextraction (DLLME) has become a very popular environmentally benign sample-preparation technique, because it is fast, inexpensive, easy to operate with a high enrichment factor and consumes low volume of organic solvent. DLLME is a modified solvent extraction method in which acceptor-to-donor phase ratio is greatly reduced compared with other methods. In this review, in order to encourage further development of DLLME, its combination with different analytical techniques such as gas chromatography (GC), high-performance liquid chromatography (HPLC), inductively coupled plasma-optical emission spectrometry (ICP-OES) and electrothermal atomic absorption spectrometry (ET AAS) will be discussed. Also, its applications in conjunction with different extraction techniques such as solid-phase extraction (SPE), solidification of floating organic drop (SFO) and supercritical fluid extraction (SFE) are summarized. This review focuses on the extra steps in sample preparation for application of DLLME in different matrixes such as food, biological fluids and solid samples. Further, the recent developments in DLLME are presented. DLLME does have some limitations, which will also be discussed in detail. Finally, an outlook on the future of the technique will be given.     

中国旅游业发展对国民经济贡献的计量分析

旅游业对于中国经济发展具有举足轻重的作用,旅游业对国民经济贡献的分析可以从多个角度展开,旅游乘数分析是其中一个重要的方面.运用基于状态空间模型的可变参数模型估计并计算得到中国旅游边际消费倾向、狭义中国旅游收入乘数和广义中国旅游收入乘数.通过分析得出了可变参数模型适合用来测度中国的旅游边际消费倾向和旅游收入乘数,以及旅游对中国国民经济具有明显的拉动作用等重要结论,并提出相关政策建议以促进中国旅游业的持续健康发展.     

碎屑岩中长石蚀变形成次生孔隙的试验研究

次生孔隙发育带是深层寻找有利油气勘探目标区的基础,酸性地层水是含油气盆地内部物质迁移和能量交换的主要介质。利用含乙酸溶液,模拟地层水,对济阳坳陷的长石砂岩进行高温高压条件下溶蚀试验,使用扫描电镜、X-衍射分析设备对实验产物进行对比检测。实验证明：（1）高温高压条件下乙酸对长石矿物有很强的溶蚀作用。（2）斜长石比钾长石更容易遭到溶蚀。结合济阳坳陷深层勘探实际,认为深层长石溶蚀耗水作用导致岩石孔隙度变大,形成次生孔隙,从而改善深层储层物性。同时长石溶蚀耗水作用是油气运移成藏活动一种驱动力。