K系数—双波长标准加入法测定镀镍溶液中的钴含量

提出了一种Ｋ系数－双波长标准加入法，应用于镀镍溶液中钴的测定。通过加入掩蔽剂氨三乙酸（ＮＴＡ），使得Ｎｉ（Ⅱ）与５－Ｂｒ－ＰＡＤＡＰ形成的配合物的吸光度显著降低，而相对应的Ｃｏ（Ⅱ）配合物的吸光度基本不变，提高了在大量Ｎｉ（Ⅱ）存在下测定Ｃｏ（Ⅱ）的准确度。     

子午岭林区森林多种效益的计量研究

通过实地调查和查阅文献资料,计算子午岭林区年森林效益为9387.16万元,其中木材价值为1646.77万元,生态效益7740.39万元,两者之比为1:4.7.论证了林业既是产业,又是公益事业,并提出对该林区森林应进行保护.     

对数平均值的极小积问题

考虑一类含参数对数平均值的极小积问题。利用对数平均值不等式，问题转述为不含对数的参数规划问题。作为它们的应用，如果涉及的函数均为线性齐次、约束集为凸多面体（无论有界或无界），则必存在最优解并且可以在其极点处实现。     

洛阳智慧交通系统的地址匹配技术

根据洛阳市城市道路分布的实际情况,研究洛阳智慧交通系统的道路动态段技术、地址数据库结构和数据追加方法、地址数据库和道路数据库的匹配策略.     

Molecular recognition of a single sphingolipid species by a protein's transmembrane domain

Functioning and processing of membrane proteins critically depend on the way their transmembrane segments are embedded in the membrane. Sphingolipids are structural components of membranes and can also act as intracellular second messengers. Not much is known of sphingolipids binding to transmembrane domains (TMDs) of proteins within the hydrophobic bilayer, and how this could affect protein function. Here we show a direct and highly specific interaction of exclusively one sphingomyelin species, SM 18, with the TMD of the COPI machinery protein p24 (ref. 2). Strikingly, the interaction depends on both the headgroup and the backbone of the sphingolipid, and on a signature sequence (VXXTLXXIY) within the TMD. Molecular dynamics simulations show a close interaction of SM 18 with the TMD. We suggest a role of SM 18 in regulating the equilibrium between an inactive monomeric and an active oligomeric state of the p24 protein, which in turn regulates COPI-dependent transport. Bioinformatic analyses predict that the signature sequence represents a conserved sphingolipid-binding cavity in a variety of mammalian membrane proteins. Thus, in addition to a function as second messengers, sphingolipids can act as cofactors to regulate the function of transmembrane proteins. Our discovery of an unprecedented specificity of interaction of a TMD with an individual sphingolipid species adds to our understanding of why biological membranes are assembled from such a large variety of different lipids.     

环向约束条件下高强混凝土早期开裂

为研究环向约束条件下高强混凝土早期开裂趋势,在单面干燥条件下应用非接触式混凝土收缩变形测定仪测试了水灰比为0.26,0.31和0.40试件的早期自由收缩变形.通过静压试验测试了试件早期弹性模量发展,通过改进环向约束试验观测了环向约束条件下各试件内部的收缩应力及应力梯度.结果表明,水灰比越小,单面干燥条件下受约束高强混凝土早期开裂危险性越高,开裂发生时间越早;开裂时间、开裂时弹性模量在很大程度上决定了早期开裂特点.     

漏钢预报系统中温度数据的预处理

漏钢预报是保证冶金连铸生产安全高效的关键环节，本文提出了一种新的温度数据预处理的方法，通过在基于模糊神经网络的漏钢预报系统中的成功应用，已经充分证明该方法不仅能优化网络的结构与参数，而且大大提高了系统的预报精度与速度。     

饮用水源地水体有机物污染研究现状

概述了水体有机物污染研究现状，阐述了我国饮用水源地水体有机物污染状况，并且分析了水体有机物污染对人体健康的危害，指出了今后饮用水源地水体有机物污染的研究重点。