季铵盐类植物生长抑制剂的合成及生物效应试验

本文研究合成四个结构有关的季铵盐:氯化2-氯乙基三甲铵(CCC),氯化2-羟乙基三甲铵(HCC),氯化1,2-二氯乙基三甲铵(DCC)和氯化苄基三甲铵(BTC),并探讨在常压下进行合成的反应条件.用这四个植物生长抑制剂和溴化异丁基三甲铵(ITB),溴化2-溴乙基三甲铵(BTB),在10~(-3)M到10~(-1)M浓度范围内,对小麦芽鞘及花生幼苗进行生物效应试验的研究,发现CCC有很好的抑制效果,而ITB和BTB亦有一定的延缓生长效应.     

氨羧型螯合树脂的合成-分别以氯甲基化和含羰基的苯乙烯-二乙烯基苯共聚物为母体合成氨羧型螯合树脂

本文分别对两种系列的苯乙烯-二乙烯苯共聚物合成了五种不同的氨羧型螯合树脂.对氯甲基系列(A系列)来说,它们的铜交换量次序是:亚胺基二乙酸型(Ⅴ)>亚胺基二丙酸型(Ⅶ)>三乙四胺型(Ⅷ)>三乙四胺一羧甲基化型(Ⅸ)>甘氨酸型(Ⅵ)对含羰基系列(B系列),其铜交换量次序是:(Ⅸ)≈(Ⅴ)≈(Ⅶ)>(Ⅵ)≈(Ⅷ) 对螯合树脂(V)还用四种不同的方法进行合成,对A系列来说,其铜交换量次序是:亚胺基二乙酸二乙酯法(a)>亚胺基二乙腈法(b)>部分季铵化-亚胺基二乙酸法(c)>六次甲基四胺胺化一羧甲基化法(d)对B系列来说,只有用a法和b法其铜交换量较好,其余均较差. 本文还对这二种系列的相应螯合树脂进行了比较,并初步探讨它们铜交换量不同的原因. 此外还研究了A系列树脂的水解,溶剂对螯合树脂制备的影响等等.     

仲胺萃取铌的性能和机理研究

铌在酸性硫氰酸盐溶液中比较稳定,可被正丁醇、环己酮、磷酸三丁酯、N.N-二烷基苯胺等萃取.鉴于在酸性溶液中铌与硫氰酸盐形成络阴离子,可望能被胺型萃取剂萃取,本文研究了仲胺萃取铌硫氰酸盐络合物的性能和机理.测定了萃合物的组成,讨论了萃合物的紫外-可见吸收光谱和红外光谱. 1 实验部分 1.1 试剂和溶液仲胺7203,核工业部北京五所研制;A_(1416),中科院上海有机化学研究所产品;煤油,     

邻羟基苄胺及其络合物的研究(Ⅲ)——镍-氮三乙酸-邻羟基苄胺混合型络合物

邻羟基苄胺(HBA)单一型络合物曾有过研究.镍与四配价氮三乙酸(NTA)1:1的络合物还有可被取代的配位水分子,因而与胺、酚类、羧酸、羟基羧酸、氨羧酸等可形成混合型络合物.本文对Ni(II)-NTA-HBA体系用分光光度法研究了混合型络合物的生成,用pH电位法研究了Ni-NTA与HBA的加合反应并测得了此混合型络合物的     

英语中长定语(从句)的译法

英语,特别是科技英语中,句子的某个中心词常常被若干个后置定语或定语从句所修饰.这是因为英语句法结构重“形合”,任何一个名词或名词词组,为了对它进行完整而明确的阐述,可以借助各种修饰结构(介词短语、不定式短语、分词短语、定语或同位语从句等)像滚雪球一样引出一长串修饰成分.而汉语讲“意合”,各个成分用意义串联,往往不需要连接词,一般句子较短.汉语中,一个名词,通常不用“叠床架屋”式的多重修饰语,因为过长的前置定语会使句子拖泥带水、冗长臃肿、晦涩难懂.     

电镀锡钴合金

本文叙述电镀锡钴合金。按照本文,提供一种由亚锡盐、钻盐、碱金属焦磷酸盐和一种光亮剂组成的光亮锡钴合金电镀液,这种光亮剂是:硫代氨基酸,或者是不少于一种氨、铵盐、胺化合物和不少于一种水溶性朊的组合物,或者是不少于一种氨、铵盐、胺化合物和不少于一种中性或碱性氨基酸的组合物,或者是不少于一种氨、铵盐、胺化合物和不少于一种有机硫化合物的组合;上述铵盐可从氯化铵、柠檬酸铵、酒石酸铵、硫酸铵和醋酸铵中选用,胺化合物可从乙二胺、     

高压甲铵预热器频繁爆管原因分析

对高压甲铵预热器爆管原因进行了分析,通过对高压甲铵预热器管壁涡流检测堵管和高压氨预热器的投用,彻底解决了高压甲铵预热器爆管给整个水溶液全循环法尿素胺装置带来危害的问题.     

季铵盐类甘蔗增糖催熟剂的合成及药效试验

本文研究合成三个结构有关的长碳链季铵盐:溴化十四烷基三甲铵(TTAB),溴化十六烷基三甲铵(CTAB)和溴化十八烷基三甲铵(STAB)并探讨其合成的反应条件.该类季铵盐对甘蔗有很好的增糖催熟效果.     

芳胺的二茂铁甲基化反应

本文通过碘化二茂铁甲基三甲铵与芳胺的反应,制备12个N-二茂铁甲基芳胺,其中与苄胺的反应不正常,得到N,N-二(二茂铁甲基)苄胺.这些化合物的结构通过元素分析、红外光谱和核磁共(?)谱得到证明。     

从煤气中回收氨的弗萨姆工艺

回收煤气中氨,国内目前采用饱和器(硫铵)法或水洗氨(浓氨水)法。这是早在二十年代就已开始工业生产的传统方法,其工艺过程和设备基本上已成定型,所积累的生产经验也较丰富。但是,这两种生产工艺存在许多缺点和问题,主要是: 1.工艺方法陈旧,原材料消耗高,设备腐蚀严重,生产故障多。硫铵生产过程消耗大量硫酸,每回收1吨氨,硫酸的理论消耗量为2.88吨,而国内硫酸供应紧缺,常因此影响生产。浓氨水生产需要大量低温地下水和蒸汽。按设计定额值计算,每生产1吨浓氨水,耗汽7～8吨。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that