共查询到18条相似文献，搜索用时 125 毫秒
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运用ｋｉｓｓｉｎｇｅｒ及Ｏｚａｗａ方法两种热分析动力学模型,利用差示扫描量热法测定三羟基乙烷、新戊二醇及其二元体系的低温固－固相变ＤＳＣ曲线,求算固－固相变的表观活化能和反应级数,探讨表观活化能随机组不同的变化规律,两种方法的处理结果是相一致的。 相似文献
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（n-C12H25NH3)2CuBr4可作为固－固相变贮热材料，利用Kissinger及Ozawa两种非等温动力学模型，处理了标题化合物的DSC实测曲线，计算了固－固相变过程中的表观活化能和反应级数。 相似文献
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康艳珍 《吕梁高等专科学校学报》2007,23(1):18-22
用DSC技术研究CnZnCl(n=12,14,16,18)及其C14ZnCl/C16ZnCl二元体系固-固相变的动力学,借助动力学方程Kissinger法和Ozawa法计算固-固相变过程的动力学参数—活化能(Ea)和反应级数(n),两种方法的结果相符.结果表明它们的固-固相变级数均为1和纯物质的活化能随链长的增加而减小;比较纯物质与二元体系的活化能,发现二元体系的活化能相对较低,因此,从动力学角度讲,二元体系的相变较容易发生.所以在相同的条件下,可以优先考虑应用二元体系. 相似文献
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热致相变材料四卤合金属酸（Ⅱ）二烷基铵具有层状钙钛矿结构．本文合成了四氯合锌酸十四铵n-（C14H29NH3）2ZnCl4和四氯合锌酸十六铵n-（C16H33NH3）2ZnCl4，并在两种材料的乙醇溶液中结晶出一系列二元混合体系．对纯组份及各个二元体系采用Kissinger和Ozawa两种动力学模型处理差示扫描量热（DSC）测定的热分析曲线，研究了非等温固-固相变动力学，计算了固-固相变过程的活化能和反应级数，两种方法的计算结果相接近，二元体系表观活化能E0值，随着C14Zn质量分数的增加，活化能呈波动变化、CnZn及二元体系的反应级数为1. 相似文献
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通过羧基酰氯酯化法合成了硬脂酸十六烷酯固—液相变材料,并使用傅立叶红外光谱仪（FT-IR）、广角X-射线衍射仪（WAXD）、示差扫描量热仪（DSC）、热重分析仪（TG）等测试手段研究了材料的结构、结晶性能以及热性能（相变焓、相变温度和热稳定性）,发现所得材料具有较高的焓变,同时其热稳定性相比硬脂酸和十六醇得到了较大的提高,是一种具有较好相变性能的新型固—液相变储能材料. 相似文献
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新型蓄能技术-相变蓄能 总被引：5，自引：0，他引：5
综述了相变材料的研究进展，介绍了相变材料的种类和特点，讨论了固-液相变、固-固-相变蓄能材料的性能和优缺点．并指出该领域中有待解决的问题及目前所采用方法，展望了蓄能技术的发展前景． 相似文献
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相变贮能材料的研究进展 总被引：1，自引：0，他引：1
宫惠峰 《邢台职业技术学院学报》2006,23(1):33-35
本文综述了固-固相变贮能材料的研究现状,详细讨论了其分类、性能及优缺点,展望了该领域的研究发展前景。 相似文献
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无机相变贮能材料的应用研究进展 总被引：5，自引：0，他引：5
刘乐 《河北工业大学成人教育学院学报》2004,19(1):14-16
主要介绍了无机固液相变贮能材料的种类 ,重点说明了其固有的缺陷以及相应的解决办法。并着重总结了两种常用的无机固—液相变贮能材料———十水合硫酸钠、六水合氯化钙。 相似文献
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简要介绍了博弈论的基本原理和非合作博弈功率控制模型,为了改进非合作博弈中终端的不公平性,将合作博弈引入到功率控制中来,使得系统中所有终端都工作在最佳的等信干比下,并推导出一个分布式基于合作博弈的功率控制算法.仿真表明,该算法明显提高了系统的性能,系统中终端具有相对较高的效用和较低的发射功率,还使得无线网络资源的使用更加合理和公平,同时算法拥有较好的收敛性. 相似文献
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Isobaric vapor-liquid equilibrium for methyldichlorosilane-dimethyldichlorosilane-benzene system 总被引：3，自引：0，他引：3
Qiu ZM Xie XL Yu SX Chen WY Xie FX Liu J 《Journal of Zhejiang University. Science. B》2005,6(10):1033-1037
INTRODUCTION Vapor-liquid equilibrium (VLE) data are veryimportant in the design and operation of separationprocesses in the chemical industry. Such informationcan be obtained experimentally or estimated by usinggeneralized methods for calculation of the propertiesof mixtures. For ideal system, it is relatively easy toestimate vapor-liquid equilibrium. However, mostsystems of industrial interest show deviations fromthe ideal behavior.The methyldichlorosilane-dimethyldichlorosi- lane-ben… 相似文献
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用TG-DTG(热重-微分热重)联用技术研究了氨茶碱片剂在氮气气氛中的热分解行为。首先运用普适法Kissinger和Ozawa法计算了氨茶碱片剂的表观活化能E和指前因子lnA,然后运用一般积分法Coats-Redfern法和Satava-Sestak法推测了主分解阶段的最佳热分解机理,推测出热分解机理为相边界反应,求出了热分解反应的表观活化能和指前因子。几种方法求得的表观活化能和指前因子的平均值分别为113.933KJ/mol,lnA为22.101(1/min).用malek法对所得结果进行了验证,进一步证明所得动力学参数和机理函数的正确性。 相似文献
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Dennis A. Vanderweele 《Learning & behavior》1974,2(4):309-312
Mongolian gerbils (Meriones unguiculatus) were examined for components of thirst in the laboratory. The gerbil, reputed to be a desert-adapted rodent, was tested for its response to quinine adulterations of water, hypertonic solutions (1 M sodium chloride, NaCl), and hyperoncotic solutions (40% W/V polyethylene glycol in isotonic saline, PG). Both NaCl and PG were administered intraperitoneally. Gerbils accepted quinine when it was the only solution available and food was ad lib, but preferred distilled water to quinine if both were available. Both PG and NaCl produced increased water intakes in gerbils within the first 2 h, postinjection. PG, however, produced the most reliable and largest increase in water consumption, illustrating that extracellular dehydration is probably a more significant thirst stimulus in gerbils. 相似文献
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Fruit ripening is a complex process and is regulated by many factors.Ethylene and polygalacturonase (PG),lipoxygenase (LOX),expansin (EXP) are all critical regulating factors in fruit ripening and softening process.With antisense,ACS tomato,Nr mutant tomato and cultivated tomato as materials,Northern blot hybridization showed that PG,LeEXP1 and LOX expressed differently in different parts of cultivated tomato fruit during ripening,which was related to fruit ripening.The ripening process of columella and radial pericarp was faster than pericarp.In both Nr mutant and antisense ACS transgenic tomato fruit,expression levels of PG,LeEXP1 and LOX were generally lower than those in cultivated fruit but still related to fruit ripening.The expression levels of PG,LeEXP1 and LOX increased in the mature green tomato fruits after 0.5 h treatment with ethylene ( 100 μL/L).These results indicate that gene expression of PG,LeEXP1 and LOXwere positively regulated by ethylene.The time and cumulative effect of the concentration exists in the expression of PG regulated by ethylene.The regulation of LOX expression mainly depended on the fruit development after great amount of ethylene was produced.PG played a major role in ripening and softening of tomato fruit,and cooperated with the regulation of EXP and LOX. 相似文献
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《Journal of College Student Psychotherapy》2013,27(4):334-343
Attention-Deficit/Hyperactivity Disorder (ADHD) has been characterized as a comorbidity to pathological gambling (PG). However, contradictory evidence has emerged, and it has not been established whether nonimpulsive features of ADHD (e.g., inattention, hyperactivity) contribute to PG risk, or how robust this relationship is in college samples. Using data from 224 college students, multiple regression analyses examined the association between ADHD traits and gambling. A marginal link between impulsivity and gambling emerged, but only in males; hyperactivity and inattention were unrelated to gambling. Therefore, caution should be used in attributing risk for PG to college students with ADHD traits, particularly inattention and hyperactivity. 相似文献
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Victor M. López-Pastor María L. Santos Pastor Antonio Fraile Aranda 《Assessment & Evaluation in Higher Education》2012,37(4):453-464
This study was undertaken at three teacher education programmes and was designed to determine the following within each programme: (1) the reliability correlations among students’ self‐grade (SSG), the grade granted by the professor (PG) and the negotiated final grade (NFG); (2) the range and frequency of grade differences between SSG and PG; and (3) the tendency of the negotiation on NFG as compared to SSG (i.e. NFG > SSG or NFG < SSG), when SSG was not equal to PG. The samples were made up of three professors and their corresponding student groups (students, n = 100, 34 and 53, respectively), each in a different teacher education programme. The results show that there was a high reliability correlation among SSG, PG and NFG in all three programmes. Furthermore, in these programmes, the grade differences were never higher than 1.5 on a scale of 0 to 10 points; in fact, agreement between DDG and PG was reached 96%, 35.29% and 43.39% of the time), and, when disagreement emerged, it was mainly within a minimum range of 0.1 to 0.5 points. As for the tendency of NFG versus SSG in each programme, slightly higher percentages were obtained for NFG > SSG in Programmes B and C, whereas the opposite (NFG < SSG) was true in Programme A; overall, however, it could be said that both tendencies balanced each other out, being the total percentages in each programme 0%, 41% and 30% for NFG > SSG; and 4%, 23% and 26%, for NFG < SSG, respectively. 相似文献
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核盘菌多聚半乳糖醛酸酶基因的克隆及hpRNAi载体的构建 总被引：1，自引：0，他引：1
多聚半乳糖醛酸酶是核盘菌致病力发挥作用的关键酶。本研究用PCR的方法从核盘菌基因组DNA中扩增出多聚半乳糖醛酸酶（PG5）基因片段,再以扩增出的PG5基因片段作为模板设计引物扩增出一个相应较小的片段。将两个PG5基因片段反向插入到植物表达载体2300 sn的35S启动子和nos终止子之间,构建出可转录表达出发夹RNA结构的组成型油菜RNA干扰载体,为今后油菜利用RNA干扰抗菌核病的基因工程研究奠定了基础。 相似文献