Polarized light imaging of white matter architecture

Polarized light imaging (PLI) is a method to image fiber orientation in gross histological brain sections based on the birefringent properties of the myelin sheaths. The method uses the transmission of polarized light to quantitatively estimate the fiber orientation and inclination angles at every point of the imaged section. Multiple sections can be assembled into a 3D volume, from which the 3D extent of fiber tracts can be extracted. This article describes the physical principles of PLI and describes two major applications of the method: the imaging of white matter orientation of the rat brain and the generation of fiber orientation maps of the human brain in white and gray matter. The strengths and weaknesses of the method are set out.     

Semiempirical and ab initio conformational analysis of 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane with application of GIAO-SCF methods to NMR spectrum interpretation

The GIAO-SCF method for calculating isotropic nuclear magnetic shielding values has been utilized to explain certain features in the ¹H-NMR spectrum of 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane. Population distributions of the low-energy conformers based on their ab initio energies were used to produce weighting factors for the individual calculated shielding values to calculate the weighted average of the shielding values for a complete set of conformers. The differences in ¹H chemical shifts between the hydrogens of the two methyl groups and between the axial and equatorial hydrogens in 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane were shown to be due to energy differences between the chair and boat orientations of the six-membered ring and contribution from a twist-boat conformation. Results suggest a hypothesis that intramolecular differences in chemical shift might be calculated to a greater degree of accuracy than chemical shifts calculated relative to a standard.     

超高压并联电抗器的结构特点和运行情况综述

综述了国内外超高压并联电抗器的设计制造和运行情况；重点介绍了国内外不同厂家生产的电抗器的结构特点,以及针对并联电抗器的漏磁发热、振动噪音、损耗等问题所采取的特殊结构措施；分析了我国超高压电网中运行的并联电抗器存在的主要问题,提出了高压并联电抗器的运行监督维护建议。     

运行核电厂监督周报的内容与格式

本文阐述了运行核电厂监督周报的目的和作用,提出了核安全监督周报的基本内容和典型格式.     

海啸与核安全

结合2004年12月26日上午在印度尼西亚苏门答腊岛附近海域发生的9级地震引发的海啸，介绍了海啸的诱发因素，阐述了海啸与核安全的关系，对中国可能遭受海啸影响的问题做了基本估计，提出了在核设施厂址选择中对海啸的工作思路。     

爆炸冲击波作用下核电站安全壳动力分析模型

根据某国防科研课题，建立核电站安全壳在爆炸冲击波作用下的动力分析模型，讨论并分析了质点杆模型在安全壳预应力混凝土结构中的应用。质点杆模型可用于计算爆炸冲击波作用下的结构响应。     

周期性脉冲流体对滴流床反应器性能的影响

用铜铬催化剂催化的过氧化氢分解反应作为液体限制反应的例子来研究周期性脉冲流体对滴流床反应器性能的影响.初步研究表明:当催化剂非完全润湿时,周期性脉冲流体能够提高反应器的性能;当催化剂完全润湿时,周期性脉冲流体不能提高反应器的性能,甚至还会产生不利影响.     

滴流床设计放大中的重要参数及其数学模型

讨论了在滴流床放大过程中必须加以考虑的重要物理和化学因素以及这些因素对设计放大的影响．介绍了确定这些参数的原理和方法，推荐了用于计算这些参数的关系式，列举了用于不同反应系统的数学模型，比较了模型预测值与实验值．     

核废物处置库厂址的地震地质评价

讨论了核废物处置库地震地质评价的基本目的和任务，提出了与能动构造和设计基准地震动相关的５项评价内容，给出了它们之间的逻辑关系和评价程序．     

宝钢马迹山港供电系统无功补偿分析

针对宝钢马迹山港原供电系统功率因数低下的问题，提出了一种新的无功补偿容量计算方法。此方法结合TCR FC的补偿方案，成功实现了该供电系统在冲击性负荷下功率因数大于0．9的目标。