悬置带线与端耦合带通滤波器的研究

本文用变分原理结合格林函数分析计算了悬置带线的特性,计算结果与其它论文结果符合很好;给出了毫米波悬置带线末端耦合带通滤波器的设计过程;建立了设计悬置带线及其带通滤波器的计算机通用程序。     

Genetic determinants of individual differences in avoidance learning: Behavioral and endocrine characteristics

Bidirectional genetic selection for good and poor active avoidance learning in a shuttle box has been carried out in three independent laboratories using remarkably similar discrete-trial training procedures. The resulting strains are known as the Roman High and Low Avoidance (RHA and RLA), the Syracuse High and Low Avoidance (SHA and SLA) and the Australian High and Low Avoidance (AHA and ALA) strains, respectively. An additional unidirectionally selected strain, known as the Tokai High Avoider (THA) strain was developed in Japan using a free-operant Sidman avoidance procedure in a Skinner box. This paper reviews the selection of the Syracuse strains, enumerates the various behavioral and endocrine characteristics of the strains, and compares them to the other similarly selected strains. The behavioral work suggests that genetic selection from diverse breeding stocks has resulted in common characteristics that differentiate the strains in the emotional, not learning, domain. The endocrine data, however, are somewhat at odds. The Syracuse strains differentiate one way with respect to endocrine function, and the Roman strains differentiate in the opposite way. We suggest, therefore, that the endocrine correlates are not tightly linked to the avoidance genotype. Genetic analysis of all of the selected strains for both the avoidance phenotype and the endocrine correlates will be needed to test this hypothesis.Preparation of this paper was supported by research grant MH-39230-3 from the National Institute of Mental Health.     

沉井地压——一种特殊表土地压的探讨

分析探讨沉井在表土中下沉时所引起的受力现象及其相关的论点，迸发现沉井在正常下沉过程中，不仅仅会受到竖井表土地压的作用，更主要是沉井的前端（刃脚）受到被动土压力的作用。     

基于双卡尔曼滤波的系统偏差消除方法

在非线性滤波问题中,一般对噪声有零均值的概率分布假设,但在实际工程中,这样的假设有时不成立,即存在一个固定的系统偏差。把该偏差当作系统待估计的参数,应用双卡尔曼滤波的基本思想,在估计状态量的同时估计出系统偏差,从而自适应地消除了其影响。以一个仅用测角信息的被动定位问题为例,经实验研究表明,提出的方法可显著改善收敛精度。     

浅议拉萨被动式太阳能建筑设计

文章介绍了在拉萨建造被动式太阳能建筑的独特优势和被动式太阳能建筑的基本类型。根据被动式太阳能建筑的设计原理,探究其设计方向、内容和思路,包括总体设计、构造优化和材料选择。     

大小叶盘-硬涂层阻尼结构的解析建模和振动分析

对叶片涂敷NiCoCrAlY+YSZ硬涂层,研究具有硬涂层的大小叶盘的动力学模型和振动特性,主要研究硬涂层对大小叶盘的阻尼减振性能的影响.首先,利用复模量理论和Oberst梁理论,建立了涂层大小叶盘结构的解析模型;然后,基于Gram-Schmidt法和Rayleigh-Ritz法,求解涂层大小叶盘结构的模态特性和受迫响应.结果表明:硬涂层阻尼对大小叶盘固有频率的影响很小,但能使模态损耗因子提高4倍,说明硬涂层可以有效提高大小叶盘的阻尼性能;此外,涂敷硬涂层可以有效抑制其受迫响应.     

Adaptive Multisensor Tracking Fusion Algorithm for Air－borne Distributed Passive Sensor Network

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非能动堆芯余热排出系统自然循环特性研究

通过对非能动堆芯余热排出系统的分析，建立了相应的数学模型，并编制程序进行了计算，计算结果表明，该系统能带走的４．５％的堆芯余热，使堆芯具有非能动安全性，文中分析讨论了系统的高度、冲角及上升段与下降段的三种传热边界条件对该系统的流量和余热排出能力的影响。     

英译时句式转换的类型、缘由及运用

转换是重要的英译技巧之一，是避免中式英语的主要手段。本文指出句式转换、句子成分转换及词类转换三者是一有机整体．阐述了句式转换的四种类型、缘由及其综合运用，使译文既忠实于原作的内容与神韵，又使译语更符合英语的语言规范。