Modeling thermal effects in nano-devices

For the purpose of investigating the role of self-heating effects on the electrical characteristics of nano-scale devices, we implemented a two-dimensional Monte Carlo device simulator that self-consistently includes the solution of the energy balance equations for both, acoustic and optical phonons. We find less degradation in the current in smaller device structures because of the more pronounced velocity overshoot.     

基于降维机理模型的储能电池安全充电在线控制技术

大倍率充电会引起储能电池负极析锂，进一步可能会诱发电池热失控并导致安全事故。而析锂副反应与电池负极电位直接相关，通过模型精确预测负极电位，传输至储能电池管理系统调整充电工况，可以有效抑制负极析锂。因此，本文提出一种基于降维机理SP2D(simplified pseudo two-dimensional, SP2D)模型的储能电池安全充电在线控制技术。首先，对P2D(pseudo two dimensional, P2D)模型中部分偏微分方程进行降维简化，建立SP2D模型。同时采用拆解测量、实验标定、算法拟合和文献参考等方法获取相应的模型参数。其次，使用不同倍率的端电压和负极电位实验数据对模型进行验证，验证结果表明模型在不同倍率恒流工况下精度较高。之后，基于SP2D模型结合比例控制器开展了电池无析锂安全充电的仿真工作，结果表明，电池经过1895s充电即达到截止电压4.3 V，且充电过程中负极电位均处于无析锂安全电位区间。最后，对仿真得到充电策略进行循环验证，结果表明提出的充电方法能够实现电池无析锂安全充电。     

板框式过滤机防渗漏结构设计

介绍一种采用负压密封的原理和射流泵装置,防止过滤器渗漏的结构。较详细论述板框结构防渗漏的原理,实践证明这种结构是适用的。     

对建筑生命中自然围合法则的研究

对实际存在的以及使用过程中的"建成物"与其外部元素发生交互作用的一般性机制的进行了剖析,并从建筑内在微循环系统的角度对该机制进行研究,从而开辟了一个全新的角度来看待建筑生命问题.在对自然围合法则概念进行重新定位的同时,又对自然围合法则的研究领域、作用机制以及对其研究的意义和作用等问题都作了系统的阐述.     

Effects of Perinatal Exposure to PCBs on Neuropsychological Functions in the Rotterdam Cohort at 9 Years of Age.

PCBs are known for their neurotoxic properties, especially on the developing brain. To increase insight into the neurotoxic effects of PCB exposure, the authors studied the effects of perinatal exposure to environmental levels of these compounds on different neuropsychological domains. In 9-year-old children of the Rotterdam PCB--dioxin cohort, higher prenatal PCB levels were associated with longer response times (RTs), more variation in RTs, and lower scores on the Tower of London (TOL; Shallice, 1982). A longer breast-feeding duration was associated with lower TOL scores and with better spatial organizational skills. There was some evidence of negative effects of lactational exposure to PCBs on scores on the TOL. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

考虑导线影响的输电塔侧向简化抗震计算方法

根据作者提出的侧向振动时高压输电塔体系的简化抗震计算模型，导出了振动方程，编制了高压输电塔体系抗震计算考虑导线影响的计算程序。经大量的输电塔体系地层反应分析，得出了导线的影响随跨度的增加而增大的结论。分析结果表明，按现行《电力设施抗震设施规范》设计的大跨越输电塔体系在强震作用下是偏于不安全的。最后，给出了输电塔体系侧向振动时考虑导线影响的界限，提出了输电塔—导线体系侧向振动的简化抗震计算方法。     

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混相压力是确定油藏能否实现混相驱的重要依据，确定混相压力的方法很多，但每种方法由于具有各自鲜明的特点和适用条件，使用都有一定的局限性，为此提出了一种能广泛适用并准确计算混相压力的新方法——系线解析法，它具有计算方法简单、用时少、结果准确可靠等优点。文章首先介绍了负向闪蒸的基本概念和原理，在此基础上，详细介绍了系线解析法的基本理论、计算方法以及应用系线解析法求解混相压力的原理，然后应用系线解析法求解了四组分系统的混相压力。计算结果表明，与其它方法相比，系线解析法确定的混相压力更准确，更可靠。     

Sound matters: Notes toward the analysis and design of sound in multimodal webtexts

In this essay, I draw from approaches in voice, music, theater, and film studies to examine four elements of sound: vocal delivery, music, special effects, and silence. Within this four-part schema, I discuss a variety of frameworks that I hope may serve as resources for those seeking to engage in both the analysis and production of sound in multimodal webtexts. Throughout the essay, I analyze several poetic Flash texts, and I consider the relationship of part-to-whole and whole-to-part when seeking to analyze and compose with multiple modes.     

Comparison of the effects of ionizing radiation at twelve dose rates from 0.0015 to 100 rad(Si)/s

Evidence is presented that two competing failure mechanisms exist in the Si-SiO₂ system with one mechanism dominating at low dose rates and the other at high. Much lower dose failures than expected were discovered at low dose rates (<0.1 rad(Si)/s) and very low dose rates (∼0.001 rad(Si)/s) in commercial SGS 4007 CMOS devices. These failure doses plotted versus dose rate have a bell-shaped curve, rather than the expected straight line (decreasing with increasing dose rate), indicating that a different failure mechanism is dominant at low dose rates than at high.     

基于Peano-hilbert扫描的层次DCT零树编码方法研究

使用层次DCT变换与零树编码相结合的方法，在扫描编码过程中按Peano—hilbert扫描顺序进行编码，不仅克服了传统分块DCT编码存在的“块效应”现象，而且与一般的零树编码方法相比，能在保证相同图像压缩质量的同时，缩短处理时间，从而提高编、解码效率。