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It is demonstrated that the chiral quaternary ammonium salts catalysts exhibit promising catalytic properties for the substrate. Part III: The synthesis and the characterizing of the macroporous aminomethyl resin-supported cinchona alkaloid complexes and the study on its catalytic properties The part consists of two subsections. the macroporous aminomethyl resin -supported cinchona alkaloid complexes were synthesized by the stuff (cinchonine, quinine and macroporous aminomethyl resin). Their structures were characterized by means of elemental analysis, XPS, TG/DTA; the chiral polymer-supported complexes were first used as catalysts for the reduction of ketones. Their catalytic properties for the reduction processes were investigated. The comparison of the products e.e., the conversion of the substrate among different reduction processes was employed with determined by HPLC. The effects of the time, the temperature, the ratio of catalyst to substrate, reaction solvent as well as the recycle times were also discussed.
第三章聚-4-氨甲基苯乙烯负载金鸡纳碱金属络合物的合成与表征及其不对称催化性能研究本章分为两节,以辛可宁和奎宁及聚-4-氨甲基苯乙烯为原料,合成了4种聚-4-氨甲基苯乙烯负载金鸡纳碱络合物催化剂,并对它们的结构用元素分析、X-射线光电子能谱、TG/DTA等几种测试手段进行了表征;首次将所合成的手性高分子负载的金属络合物用于催化芳香酮不对称还原反应,详细研究了所得的手性高分子负载的金属络合物对不同底物的催化性能,用HPLC等分析手段定量检测了还原过程的底物转化率及其产物对映异构体选择性,并考察了反应时间、反应温度、催化剂和底物投料比、反应溶剂和循环次数对催化性能的影响。
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1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.
通过上述几个方面的研究,主要得出以下15条结论:(1)生态位构建可使空间结构种群,甚至是在没有杂合子优势的条件下,形成多种可能的稳定基因型分布模式;(2)随着环境的破坏与恶化,种群的生态位构建作用加速其较早形成稳定多态以阻碍环境对种群的不利影响,解释了有机体在不利环境下的一种生活史对策;(3)生态位构建作用通过基因型—环境反馈机制及有限的基因交流导致基因型多态的稳定共存;(4)有机体的生态位构建作用是一种积极的动力改变环境进而改变其自然选择的方向;(5)生态位构建的时滞作用对集合种群动态和空间分布产生深刻影响;(6)集合种群大小在时滞的崭新效应和等权重效应下达到一固定值,而在首位效应下达到统计稳定,表明首位效应的影响最显著;(7)首位效应下生态位构建相对权重的增量和时滞的长度是影响系统不稳定性动态的关键因素;(8)适中的生态位构建强度有利于集合种群的续存;(9)生态位宽度变窄会减少集合种群的数量从而增加其灭绝风险;(10)时滞和生态位构建的双重作用使系统产生周期振荡,并在异质性环境中产生稳定的螺旋波,破碎的螺旋波和环形波三种分布模式;(11)集合种群与资源含量的空间分布因为相滞而互补;(12)具有生态位构建的集合种群续存不仅取决于侵占率与灭绝率之间的平衡,而且依赖于生态位构建能力同其生境的自然消耗速率之间的妥协;(13)当生境中适合侵占的斑块比例小于其侵占率与灭绝率之比时,生态位构建作用促使集合种群在一定条件下续存:(14)生境斑块的状态从不适合到适合转变过程中存在生态位构建强度和系统初始条件这两个阈值;(15)集合种群的大小同正生态位构建能力正相关,意味着对环境具有较强正作用的有机体对维持有效生境起积极作用。
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Reductive conversion of geraniol to citronellol is adopted as a model reaction, and several factors in the reaction are discussed using gas chromatography method. The influence of n-hexane and butyl acetate, as organic solvents, on biocompatibility was studied; the influence of methanol, ethanol, glycol, n-butanol and 1-hexanol, as energy substance, on the transformation efficiency was compared, respectively; the catalysis capabilities of Baker's yeast, XST-KO yeast, LP yeast, alcohol yeast, dry yeast, Saccharomyces cerevisiae, Angel yeast and Meishan yeast were discussed. It has been proved that biocompatibility of n-hexane are much better than that of butyl acetate, and the hexane has been demonstrated the most effective in terms of the influence on biotransformation, Baker's yeast has shown the highest tranformation efficiency among the eight yeast strains.
以香叶醇转化为香茅醇作为模型反应,通过气相色谱法进行定性和定量分析研究了影响该有机相生物转化反应的几个基本因素,考察了两种有机溶剂正己烷和乙酸丁酯对生物相容性的影响,选用甲醇、乙醇、乙二醇、正丁醇和l-己醇分别作为能量物质进行实验,比较其对转化的影响并探讨了Baker's酵母、XST-KO酵母、LP酵母、酒精酵母、假丝酵母、干酵母、安琪酵母和梅山酵母八种不同酵母作为生物催化剂对模型反应的催化能力,结果表明,正己烷作为有机溶剂,其生物相容性明显好于乙酸丁酯,更加有利于该生物转化反应进行;乙二醇作为能量物质,该模型反应转化率最高;而 Baker's酵母作为生物催化剂,对该模型反应的催化能力最强,最适合作为该模型反应的催化剂。
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In view of practical problem during Sulige gas field development, this paper complete follow study content. Study material balance theory of two district compound gas reservoir. Carry out stress sensitivity experiment on matrix rock and labor created fracture core from Sulige gas field with America Core Company high pressure high temperature flow experimental instrument to study stress sensitivity change rule of different permeability matrix rock and created fracture core at the condition of time and again switch on and off well and different drawdown pressure. Carry out depletion experiment on matrix rock of different permeability serial combination with different kinds of allocation, using double core clamper serial connected experimental apparatus, to study gas well production performance of bi-zonal compound low permeability reservoir during low pressure production stage. At the basis of experimental study, establish single well simulation model to analyze development index infection caused by stress sensibility and production performance infection rule caused by inner formation and outer formation of bi-zonal compound gas reservoir permeability variation while considering stress sensitivity.
针对苏里格低渗气田开发中存在的实际问题,完成以下研究内容;研究了两区复合气藏物质平衡原理;利用美国岩芯公司高温高压流动实验仪,对取自苏里格气田基质岩芯和人工造缝岩芯进行应力敏感实验,研究不同渗透率基质岩芯和造缝岩芯在多次开关井和不同生产压差条件下的应力敏感变化规律;采用双岩芯夹持器串联实验装置,对不同渗透率串联组合的基质岩芯进行各种配产条件下的衰竭实验,研究两区复合的低渗储层气井在低压生产阶段的生产动态特征;在实验研究的基础上,建立单井模拟模型分析储层应力敏感性和非均质性对开发指标的影响,研究考虑应力敏感时两区复合气藏储层中内区和外区渗透率变化对开发动态的影响规律。
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Secondly, what emphasized are his view of literature, involving the relation of society background and the production of it, the influences both from eastern and western classicality, the status of humain in it, his pursuit of the ideality of the art and sincerity, the important role in today's literature as well as the defaults of it.
其次,本文以人格的特点关照傅雷先生的文艺观:当时的社会背景与其文艺观产生的关系;中西方古典主义对其文艺观的影响;"人的"观念在其文艺观中的地位;他对艺术理想境界的追求、对真诚的推崇;及其文艺观对今天的文学艺术的指导意义、在今天的价值和地位。
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Secondly, what emphasized are his view of literature, involving the relation of society background and the production of it, the influences both from eastern and western classicality, the status of hunmain in it, his pursuit of the ideality of the art and sincerity, the important role in today's literature as well as the defaults of it.
其次,本文以人格的特点关照傅雷先生的文艺观:当时的社会背景与其文艺观产生的关系;中西方古典主义对其文艺观的影响;"人的"观念在其文艺观中的地位;他对艺术理想境界的追求、对真诚的推崇;及其文艺观对今天的文学艺术的指导意义、在今天的价值和地位。
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This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.
本文法对耕地等别划分的原则、内容及方法作了较详细的阐述,介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法;分析了耕地等别划分工作与地理信息系统技术相结合的必要性,简要介绍了地理信息系统软件ARC/INFO及其他相关软件的功能特点,制定了地理信息系统支持下耕地等别划分的技术路线,通过对河北省蠡县蠡吾镇的实证研究,重点阐述了ARC/INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法:提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案,阐述了基于与图形库相链接的特征编码表,单因素图提取、成果图的输出的具体实现方法;提出了GIS环境下耕地单元划分的原则和方法,即在保留土壤因素图斑界线、行政界线和重要地物等的原则下,将土壤单因素图和土地利用现状图进行拓扑叠加,对叠加图中的矢量线进行适当的删除;阐述了在计算机环境下,耕地分等参数计算模型建立的方法,并用FOXPRO6.0语言程序实现了参数计算的自动化;阐述了根据图形库特征编码表和建立绘图符号查找表,按不同图层叠加绘制成果图的方法,该过程用命令程序实现耕地等别图的输出。
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The study is carried out that the comparison of fine root production, decomposition and distribution along with Korean pine and broad-leaved climax forest succession; the fine root contribution to the belowground C and N storage along with Korean pine and broad-leaved climax forest succession; and the comparison of belowground C and N storage among the Korean pine and broad-leaved climax forest, three dark-conifer forests, a betula ermanii forest along altitude.
研究内容包括:原始阔叶红松林及其不同演替阶段的次生林中细根的生长和周转、分解与分布的特征,阐明在不同演替阶段细根的变化;原始阔叶红松林及其不同演替阶段的次生林中细根对根系、土壤和林地地下的碳、氮贮量的影响,分析在不同演替阶段细根周转对地下碳、氮贮量的贡献;以及对不同垂直海拔高度分布的不同类型的原始森林中细根和根系生物量的变化,及细根对根系、土壤和林地地下碳、氮贮量的贡献进行了研究。
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Through deep if misplaced affection for you: through great pity for your defects of temper and temperament: through my own proverbial good-nature and Celtic laziness: through an artistic aversion to coarse scenes and ugly words: through that incapacity to bear resentment of any kind which at that time characterised me[11b]: through my dislike of seeing life made bitter and uncomely by what to me, with my eyes really fixed on other things, seemed to be mere trifles too petty for more than a moment's thought or interest — through these reasons, simple as they may sound, I gave up to you always.
出于对你深挚的如果说是错爱了的感情,出于对你禀性上的缺点深切的怜悯,出于我那有口皆碑的好心肠和凯尔特人的懒散,出于一种艺术气质上对粗鲁的言语行为的反感,出于我当时对任何事物都能逆来顺受的性格特征 [11b],出于我不喜欢看到生活因为在我看来是不屑一顾的小事(我眼里真正所看的是另外一些事)而变得苦涩不堪的脾气——出于这种种看似简单的理由,我事事全听你的。
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Types of help-seeking behavior found from participants in this study include psychotic medical therapy, Chinese medicine therapy (taking herbal medicine or receiving chiropractic therapy), folk therapy, popular sector (nourishing brain by taking cod-liver oil, doing sports) and the pluralistic help-seeking type-the combination of two or more of the above types.
研究发现,精神分裂症患者在经验疾病症状时,多呈现对於听觉与视觉的症状经验,患者衍生出因应措施以及家属缺乏对精神分裂症的认识,导致延迟就医的发生;受访者求助行为的型态包括精神医疗、中医治疗、民俗疗法(祭解、拜拜、收惊、求神问卜)与大众医疗方式等多层面并用的复式求助型态;采取复式求助行为的决定因素为:宗教与对精神疾病的民俗信念、寻找任何可能痊愈的治疗方式与受访者的健康信念;受访者在复式求助行为中选择精神医疗的原因有:患者外显行为的干扰程度、对精神分裂症疾病正确的认知与在另类疗法体系受挫的求助经验;而求助精神医疗的情境有:寻求答案与改变现况。
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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.
然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。
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Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.
镀锌钢托盘多用于出口,替代木托盘,免薰蒸,符合欧盟、北美各国对出口货物包装材料的法令要求;喷涂钢托盘适用于重载上货架之用,托盘表面根据需要制作成平板状、波纹状及间隔形式,满足不同的使用要求。
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A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.
付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。