GB150-1998与ASMEⅧ-1的某些差异

本文以ASMEⅧ-1为基础，对GB150－1998与ASMEⅧ-1的差异提出分析，作为同行专家们的参考。     

GB150—89《钢制压力容器》简介

本文旨在简要地介绍GB 150-89《钢制压力容器》各章的主要内容,侧重点是分析它与85版《钢制石油化工压力容器设计规定》的主要区别。     

GB150-1998与JB4732-95的对比分析

本文总结了两个标准的主要特点和总体思想，分析了两个标准对适用范围及材料、制造、试验和检验要求上的不同之处。     

外压复合板折边锥壳的常规计算方法

简要介绍盐化工设备中复合板的使用,通过对外压锥壳的分析计算和结果的比较,解释GB150中外压锥壳的设计和SW6对其的计算方法。     

压力容器制造过程中几种常见问题及对策

对压力容器在制造和检验方面几种常见问题做了分析,并对焊缝的布置,材料的替代,开孔和接管,安装尺寸,焊角尺寸等问题提出了相应的对策。     

GB150-1998和JIS B 8265-2003标准应用对比

介绍GB150-1998和JIS B 8265-2003压力容器标准的对比应用。     

EN 13445、ASME规范和GB150

对EN 13445、ASME规范、GB 150等的有关内容,如适用范围、材料的防脆断措施、外压壳体设计、凸形封头设计、开孔及其补强设计、法兰设计、换热器设计、按公式设计和按应力分析设计、强度试验压力及其限制条件等的联系和对比作出分析,并提出看法供讨论。     

浅析GB150—1998中对焊后热处理规定的修改

本文介绍了GB1 5 0— 1 998中对焊后热处理规定的几处修改 ,并对这些修改进行了分析。     

GB15O-1998和JIS B 8265-2003标准应用对比

介绍GB150-1998和JIS B 8265-2003压力容器标准的对比应用.     

GB 150-2011与ASME Ⅷ-12013等面积补强法的对比与原理分析

对GB 150-2011和ASMEⅧ-1 2013的等面积补强法进行了差异分析。通过有限元分析法,从开孔直径限制和开孔豁免补强两方面分析了两种标准的区别和原理。给出了两种标准在具体计算时的差别与要求。提出一种实际中借鉴ASMEⅧ-1 2013相关规定的压力容器设计方法。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.