New feasibilities for characterizing rough surfaces by optical-correlation techniques

New feasibilities are considered for the optical-correlation diagnostics of rough surfaces with different distributions of irregularities. The influence of deviations of the height surface roughness distribution from a Gaussian probability distribution on the accuracy of optical analysis is discussed. Possibilities for the optical diagnostics of fractal surface structures are shown, and a set of statistical and dimensional parameters of the scattered fields for surface roughness diagnostics is determined. Finally, a multifunctional measuring device for estimating these parameters is proposed.     

Oxidative catabolism of α-tocopherol in rat liver microsomes

The goal of this study was to clarify the mechanism responsible for the catabolism of α-tocopherol. The vitamin, bound to albumin, was incubated with rat liver microsomes and appeared to be broken down. Optimal production of the metabolite was obtained when 1 mg of microsomal protein was incubated with 36 μM of α-tocopherol in the presence of 1.5 mM of NADPH. Chromatographic and mass spectrometric analyses of the metabolite led to the conclusion that it consists of an ω-acid with an opened chroman ring, although we could not perform nuclear magnetic resonance analysis to confirm this. Our data show that α-tocopherol is ω-oxidized to a carboxylic acid and that this process can occur in rat liver microsomes in the presence of NADPH and O₂. The oxidation to the quinone structure appears to be a subsequent event that may be artifactual and/or catalyzed by a microsomal enzyme(s).     

Further characterization of rat dihydroceramide desaturase: Tissue distribution, subcellular localization, and substrate specificity

The introduction of the double bond in the sphingoid backbone of sphingolipids occurs at the level of dihydroceramide via an NADPH-dependent desaturase, as discovered in permeabilized rat hepatocytes. In the rat, the enzyme activity, which has now been further characterized, appeared to be mostly enriched in liver and Harderian gland. By means of subcellular fractionation of rat liver homogenates and density gradient separation of microsomal fractions, the desaturase was localized to the endoplasmic reticulum. Various detergents were inhibitory to the enzyme, and maximal activities were obtained in the presence of NADPH and when the substrate was complexed to albumin. In the presence of albumin, the chain length of the fatty acid of the truncated dihydroceramides hardly affected the activity. Finally, in view of a likely evolutionary relationship between desaturases and hydroxylases, the formation of hydroxylated intermediates was analyzed. No evidence for their presence was found under our assay conditions. In part presented at the Conférence Jacques Monod “Cell lipids: Topology, transport and signalling functions”, Aussois, May 1997 (France); Van Veldhoven, P.P. “Ceramide biosynthesis: Characterisation of the conversion of dihydroceramide to ceramide”. Contributed equally to this study.     

安钢380m3高炉强化炉前出铁的可行性研究

针对安钢两座380m3高炉,调查分析了其出铁现状和产生这种情况的原因,提出了强化炉前出铁的可行性措施.指出在6号380m3高炉大修采用大风机后,应该增加出铁次数或延长出铁时间,配备多组渣罐,改进炉前设备和耐火材料,提高出铁实操技能,强化管理.届时,两座380m3高炉平均日产有望突破1 600t,缓解集体公司缺铁现状.     

嵌入式安全网卡在网络监听中的应用研究

论述了嵌入式安全网卡的结构、功能，分析了网络监听原理、检测手段和防范措施，提出了把嵌入式安全网卡应用到网络监听中的方案。在嵌入式安全网卡中有一个重要部件加密机，它能采用不同加解密算法对数据进行加解密，还能解决加密运算的瓶颈。安装了这种网卡的电脑，在进行数据传输中，即使通信内容被监听到，所得到的也是被加了密的内容，不能被破译，从而实现了数据在网络传输过程中的安全。     

崮山水库特色小流域水土保持措施及效益

崮山水库特色小流域水土保持综合治理过程中,综合考虑到土地利用、地貌部位、空间结构、措施类型以及治理与开发等问题,因地制宜地布设生物、工程等各项水土保持措施,初步建立起了具有当地特色的小流域治理模式,取得了显著的经济、社会和生态效益,为北方土石山区胶东半岛小流域的水土保持综合治理提供了借鉴。     

300亿蓝图 郎酒亮出三强雄心

3月23日．郎酒集团2011年全国经销商大会在成都召开。会上，郎酒集团董事长汪俊林宣布。2010年郎酒集团销售收入突破58亿元，同时2011年初郎酒提价工作顺利完成，未来十年郎酒将继续向着既定的“123工程”迈进，力争在2012年实现销售收入100亿元．2015年实现200亿元．2020年实现300亿元。     

仁酒2010年的新起点

作为茅台股份公司个性化产品之一，仁酒自2007年面市以来一直保持稳健的发展步伐，到2009年，仁酒在前期市场建设、布局的基础上开始进入了新一轮的调整和布局。