油田稳产措施规划数学模型

措施规划是油田开发领域的一项极为重要的工作,它对于延长油田稳产年限,合理地安排稳产措施是十分必要的.本文对措施规划的几类数学模型进行了分析,提出了对不确定性因素的处理--随机规划的建立与求解方法.     

苯系物扩散管气体标准物质的研制

按照ISO 6145—2003、ISO 6144—1998标准,研制了新型气体标准物质动态配气装置,实现了微机对动态配气装置主要参数数据的实时监控。用该装置研制了氮中微量苯系物扩散管气体标准物质,量值的相对扩展不确定度为2％-3％,并与静态容量法配气进行了比较。     

Effects of MN4-Type Coordination Structure in Metallophthalocyanine for Bio-Inspired Oxidative Desulfurization Performance

Oxidative desulfurization (ODS) is the promising new method for super deep desulfurization of fuel oil. The oxidative desulfurization performance of the metal-N₄-chelates metallophthalocyanines (MPcs) is related to the chemical properties of conjugate structures and the central metal ions. Herein, a biomimetic catalytic system composed of metallophthalocyanines (MPcR₄, M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II); R = -H, -COOH, -NO₂, -NH₂) and molecular O₂ was performed to study the influence of MN₄-type coordination structure in metallophthalocyanines for the degradation of dibenzothiophene (DBT) in model oil containing n-octane. The results reveal that the conjugate structures and the center metal ions of metallophthalocyanines played key roles in oxidative desulfurization performance. The inductive effect of different R substituents strongly affected the electron cloud distribution of the conjugate structures and the catalytic performance. Moreover, the catalytic activity of MPcs, which is related to the d electronic configuration and ligand-field effects, does not sequentially increase with the increase in the d electron number of central metal ions.     

Graphene wrapped phthalocyanine: Enhanced oxidative desulfurization for dibenzothiophene in fuel

Graphene wrapped metal phthalocyanine (MPc/RGO, M = Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺) composites are synthesized by a facile ‘in situ hydrothermal’ method, using graphene oxide, M (CH₃COO)₂ and phthalic anhydride as the precursors. A biomimetic catalytic system of MPc/RGO and molecular O₂ have high activity for ultra‐deep removal of dibenzothiophene (DBT) in model oil containing n‐octane. Compared with pure graphene oxide and MPc, MPc/RGO composites displayed highly enhanced catalytic activity for the oxidation of dibenzothiophene in n‐octane. The conversion ratio of DBT was up to 97.51% after 180 min treatment at 60 °C and atmospheric pressure. The photostability of RGO/MPc composites photocatalystic degradation of dibenzothiophene was investigated. Mechanistic studies revealed that the RGO/MPc ? O₂ · species were the main active intermediate via the π‐π stacking interaction of MPc and RGO. The RGO wrapped phthalocyanine materials offer great potential as active photocatalysts for degradation of thiophene derivatives in fuel.     

OSCILLATION AND NON-OSCILLATION FOR SECOND-ORDER QUASI-LINEAR DIFFERENCE EQUATIONS

Some oscillation and non-oscillation criteria for second-order quasi-linear difference equations are given. The results in Zhang and Zhou [4] are improved.     

强流脉冲相对论电子束加速器：—闪光二号

本文介绍了在西北核技术研究所建成的一台低阻抗脉冲电子束加速器——闪光二号。它主要用于核辐射效应模拟。加速器系统由Marx发生器、水介质同轴线和二极管三大主机部件以及十几个配套设备所组成。文中给出了在允电电压±55kV和±70kV两个电压等级下调试和运行的结果。最大输出电流600kA,管电压1.2MV。目前该加速器已用于电子束和X射线的实验研究。     

Synthesis and Characterization of Both Enantiomers of a Chiral C_(60) Derivative Bearing the 1, 1'-Binaphthyl Group

Followingthedevelopmentoffullerenefunctionalization',therehasbeenanincreasinginterestinthesynthesisofchiralfullerenederivativesfortheirpotentialapplicationintheareasofpharmaceuticalsandoptics'~'.Introductionofchiralityfromthechiralsubstituenttothefullerenecore3hasbeenestablishedtobeoneofthemostversatilemethodsforthechiralfullerenederivatives.Inthisway,chiralweresynthesizedbyVasellaetap.ThesynthesisandCDspectraoffullerene-peptideswerereportedbyPratoandco-workers',aswellasDiederich'sgroup'.Rec…     

Polarization of Lidar Returns from Water Clouds: Calculations and Laboratory Scaled Measurements

The main features of a Monte Carlo code developed to deal with polarization of lidar returns from water clouds in multiple scattering regime are described. The paper presents an example of results pertaining to a stratified cloud structure, and a series of comparisons of calculation results with measurements carried out in the laboratory. For double scattering a comparison of Monte Carlo results with those of an analytical formula is also given.Presented at the 7th International Workshop on Multiple Scattering Lidar/Light Experiments (MUSCLE7), July 21–23 1994, Chiba, Japan.     

ON A PERIODIC VOLTERRA EQUATION WITH SEVERAL FINITE DELAYS AND AN INFINITE DELAY

The existence of positive periodic solutions for a periodic Volterra equation with several finite delays and an infinite delay is established. Sufficient conditions for the periodic solutions having global attractivity are obtained.