炸药的性能及其在爆破中的作用

文章探讨了炸药的主要性能及其在爆破中的作用，为爆破作业选择合适的提供了参考依据。     

射流泵内不可压流动N—S耦合方程有限元分析

应用Ｇａｌｅｒｋｉｎ有限元和Ｂａｌｄｗｉｎ－Ｌｏｍａｘ湍流模型，求解射流泵内不可压粘性流动Ｎ－５耦合方程，得到了射流泵内部流动参数分布，给出两个计算实例，计算结果与滓测资料基本吻俣，从而为射流泵内部流场的数值模拟研究提供了一种新方法。     

粉状乳化炸药微观结构研究

粉状乳化炸药是一种无单质炸药敏化的及爆炸性能优良的抗水工业炸药，其爆速可达４７００ｍ·ｓ＾－１（φ３２ｍｍ药卷），临界直径小于８ｍｍ。该炸药采用先进的乳化混合－喷雾制粉工艺进行生产。该文通过电镜观察，溶损试验，抗水性能试验等手段探讨了粉状乳化炸药的微观结构，揭示了粉状乳化炸药具有优良的爆轰性能的抗水性能的内在因素。     

粉末工艺合成金刚石用新型保温片的研究

本文介绍了一种用白云石和石墨制作的新型保温片，用在粉末工艺合成金刚石中，实验结果表明能有效地阻止合成腔内部的温度向外界散失，保持了合成腔内部的温度的稳定，大幅度降低了合成时使用的功率，能够较大幅度的节约日益紧张的电力资源。同时由于合成腔向外界散热减少，降低了硬质合金顶锤在合成时的温度，大大延长了硬质合金顶锤的寿命，显著地降低了人造金刚石的生产成本。并指出白云石保温片直接与叶蜡石复合块中的白云石衬管接触，构成一个相对严实的白云石保温密闭腔体，使用效果会更好。     

SnoRNAs as tools for RNA cleavage and modification

Eukaryotic small nucleolar RNAs (snoRNAs) influence rRNA synthesis at two stages: nucleolytic processing and selection of nucleotides to be ribose methylated (Nm) or converted to pseudouridine (psi). The two modification functions and some processing activities involve direct base pairing of snoRNA with rRNA. In addition to rRNA-targeting sequences, snoRNA function depends on the presence of conserved box elements involved in snoRNA synthesis and localization. The present investigation is directed at using snoRNAs as tools for two purposes: 1) introducing nucleotide modifications into novel sites in rRNA and other snoRNAs, and: 2) targeting nucleolar RNAs for destruction using snoRNA:ribozyme chimers ('snorbozymes'). Early results demonstrate that snoRNAs can be used for both applications.     

数字HDTV发射管的发展及其应用

本文主要论述了英国ＥＥＶ，美国Ｖａｒｉａｎ和法国ＴｈｏｍｓｏｎＴｕｂｅｓＥｌｅｃｔｒｏｎｉｑｕｅｓ三家公司推出的数字ＨＤＴＶ发射管ＩＯＴ（ＩｎｄｕｃｔｉｖｅＯｕｔｐｕｔＴｕｂｅ）以及ＴｈｏｍｓｏｎＴｕｂｅｓＥｌｅｃｔｒｏｎｉｑｕｅｓ新近推向市场的ＨＤＴＶ发射管ＴＨ５６３四极管和双端四极管（Ｄｉａｃｒｏｄｅ—Ｄｏｕｂｌｅ－ｅｎｄｅｄｔｅｔｒｏｄｅ）ＴＨ６８０所达到的技术水平；特别着重介绍了上述三种数字ＨＤＴＶ发射管的整机应用情况，同时也展望了ＩＯＴ，尤其是ＴＨ５６３和ＴＨ６８０的美好应用前景。     

Managed care and outcomes of hospitalization among elderly patients with congestive heart failure

123I-radiolabeled metaiodobenzylguanidine (123I-MIBG) cardiac imaging has been used to evaluate the distribution of sympathetic nervous system (SNS) in the heart. Different heart diseases have shown impaired cardiac SNS distribution as reflected by MIBG activity. The aim of this study was to assess the cardiac distribution of SNS in normal subjects, using MIBG imaging. Ten normal subjects (1 male and 9 females, mean age 46 +/- 9 years) with no cardiac abnormalities underwent myocardial 123I-MIBG scintigraphy, Tc-99m methoxyisobutylisonitrile (MIBI) cardiac perfusion imaging and equilibrium radionuclide angiography (RNA). Regional myocardial MIBG and MIBI activities were quantitatively evaluated using a region of interest analysis. For this purpose, the left ventricle was divided into 6 myocardial regions as anterior, apical, inferior, septum, lateral and posterolateral. In particular, myocardial MIBG and MIBI activities were measured as myocardium to mediastinum ratio. Regional left ventricular function was assessed by RNA. Myocardial MIBG uptake was homogeneous in anterior (2.2 +/- 0.5), inferior (2.5 +/- 0.7), septal (2.4 +/- 0.4), lateral (2.3 +/- 0.4), and posterolateral (2.3 +/- 0.4) regions. Conversely, MIBG uptake was significantly lower in the apical region (1.9 +/- 0.3) compared to all other left ventricular segments (p < 0.05). Regional myocardial perfusion, as measured by MIBI uptake, was homogeneous in all regions. No regional left ventricular wall motion abnormalities were observed by RNA. In conclusion, our data suggest that a decreased MIBG uptake may be observed in the left ventricular apical region of normal subjects reflecting reduced sympathetic innervation of the apex. This finding is not related to myocardial perfusion or wall motion abnormalities. The knowledge of cardiac sympathetic innervation in normal subjects may be helpful to assess SNS abnormalities in heart disease.