轴对称问题线元上分布奇点的诱导速度势和诱导速度

本文给出轴对称问题线元上高次分布源和偶极在无界域中的诱导速度势和诱导速度的计算公式,可供用分布奇点法求解轴对称势流问题时参考.     

蜂胶中具有抗氧化活性的木脂素

利用柱层析方法从蜂胶中分离得到了4种呋喃骈呋喃类木脂素，利用波谱学方法鉴定为芝麻脂素（sesamin）、yangambin、（＋）－松脂素[( )-pinoresinol]和（＋）－丁香脂素[( )-syringaresinol]，其中（＋）－松脂素和（＋）－丁香脂素为首次从蜂胶中得到。利用测定小鼠肝细胞微粒体脂质过氧化抑制作用的方法，检测了所得到的4种木脂素的抗氧化活性，其IC50值范围为9.0-14.0μg/ml。     

Adsorption and inhibitive properties of benzimidazole derivatives in acid mild steel corrosion

Eight diazoles were investigated as corrosion inhibitors of mild steel in 1 M hydrochloric acid using gravimetric and polarization techniques. It was found that the inhibition efficiency increased with the increase of organic substrate concentration, while the adsorption followed the Frumkin isotherm. A correlation between the electronic parameters (induction and mesomeric effects of the substituents, ionization potential values) as well as those of the chemical structure (molecular area) of diazoles molecules and their inhibiting properties was looked for. The results obtained show that a definite interdependence exists but it is not as simple and straightforward as might be expected.     

剩余油分布及其挖潜研究综述

介绍了国内外剩余油分布的研究现状，从微观规模和宏观规模2个角度对剩余油研究技术进行了综述，微观规模常用的研究技术主要有物理模拟、计算机模拟等，宏观研究常用技术有测井解释、三维地震、流动单元划分等。认为不同的地质环境和开发方式会导致不同的剩余油分布模式，不同油田、不同区块分布模式不同。影响剩余油分布的主要因素中，储层因素是内在的，开发因素是外在的。概括介绍了我国部分油田剩余油挖潜的一些常用技术，认为应主要从改善储层非均质性的地质角度和调整注采状况的开发角度入手，采用动态、静态结合和多学科结合的方法挖潜剩余油。     

Antioxidant activity of anacardic acids

Anacardic acids, 6-pentadec(en)ylsalicylic acids isolated from the cashew Anacardium occidentale L. (Anacardiaceae) nut and apple, were found to possess preventive antioxidant activity while salicylic acid did not show this activity. These anacardic acids prevent generation of superoxide radicals by inhibiting xanthine oxidase (EC 1.1.3.22, Grade IV) without radical-scavenging activity. Notably, the inhibition kinetics of anacardic acids do not follow hyperbolic dependence of enzyme inhibition on inhibitor contents (Michaelis–Menten equation) but follow the Hill equation instead. Anacardic acid (C_15:1) inhibited the soybean lipoxygenase-1 (EC 1.13.11.12, Type 1) catalyzed oxidation of linoleic acid with an IC₅₀ of 6.8 μM. The inhibition is a slow and reversible reaction without residual enzyme activity. The inhibition kinetics indicate that anacardic acid (C_15:1) is a competitive inhibitor and the inhibition constant, K_I, was 2.8 μM. Anacardic acids act as antioxidants in a variety ways, including inhibition of various prooxidant enzymes involved in the production of the reactive oxygen species and chelate divalent metal ions such as Fe²⁺ or Cu²⁺, but do not quench reactive oxygen species. The C₁₅-alkenyl side chain is largely associated with the activity.     

松辽流域初始水权分配中确定政府预留水量的研究

介绍了松辽流域水权初始分配中政府预留水量问题的系统研究。首先给出了政府预留水量的确定原则和预留优先级，然后提出一种政府预留水量双侧耦合分析方法，通过政府预留水量的需求与可能两个侧面，采用“自下而上”的预留需求与“自上而下”的可预留水量双侧耦合分水模式。通过大量的分析和计算，得出了松辽流域不同水平年、不同频率的政府预留水量。分析和应用结果表明，该方法是可行的，可为流域初始水权分配提供一种有效的技术方法。     

准噶尔盆地三台-北三台地区第三系勘探潜力分析

从沉积及储层组合、油气运移系统等方面全面剖析了准噶尔盆地三台-北三台地区第三系油气成藏条件，建立了成藏模式，对未钻探区勘探潜力进行了预测；通过分析，认为该区第三系储层物性主体差，断裂更多地表现为封闭性，导致沟通深部油气源的运移体系不畅，致使第三系圈闭不能有效捕获和储集油气。圈闭又比较匮乏，主体勘探潜力不大。北25井西背斜紧邻多期活动的甘诃子北断裂，第三系可能发育较好的储层，相对有利，北25井西背斜应是钻探第三系的首选目标。     

非洲油气勘探区战略选择建议

非洲不同类型的沉积盆地主要可归纳为：古、中生代挠曲盆地，中、新生代大陆边缘断陷盆地，板内裂谷盆地和大陆边缘进积三角洲盆地。通过盆地油气成藏条件地质综合评价、不同勘探阶段的类比和最终勘探潜力分析，对非洲的沉积盆地进行了划分，在此基础上，总结出非洲油气勘探区选择应遵循的原则。对于油气勘探长期战略选区，原则上，优选低成本油气远景区，即使存在高风险，但亦可获得高回报；对于油气勘探中期发展策略选区，应该寻找地质条件好的油气资源区，投资中短期高利润项目；对于油气勘探中短期发展策略选区，一般应优选中低成本、低风险、低利润且短期能获得油气发现和勘探突破的有利油气勘探区。图1表3参5     

On the Locus of Speed-Accuracy Trade-Off in Reaction Time: Inferences From the Lateralized Readiness Potential.

Lateralized readiness potentials (LRPs) were used to determine the stage(s) of reaction time (RT) responsible for speed-accuracy trade-offs (SATs). Speeded decisions based on several types of information were examined in 3 experiments, involving, respectively, a line discrimination task, lexical decisions, and an Erikson flanker task. Three levels of SAT were obtained in each experiment by adjusting response deadlines with an adaptive tracking algorithm. Speed stress affected the duration of RT stages both before and after the start of the LRP in all experiments. The latter effect cannot be explained by guessing strategies, by variations in response force, or as an indirect consequence of the pre-LRP effect. Contrary to most models, it suggests that SAT can occur at a late postdecisional stage. (PsycINFO Database Record (c) 2010 APA, all rights reserved)