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the structure
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     Study on the Structure,Magnetic and Magneto-optical Properties of PtCoNi Alloy Films
     PtCoNi合金薄膜的结构、磁性和磁光特性研究
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     A Study on Dynamic Response of the Structure with Uncertain Physical Parameters
     含随机参数结构的动态响应研究
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     Study on the Structure of Polyolefin Hollow Fiber Membranes and Their Properties for Gas Separation
     聚烯烃中空纤维膜结构及其气体分离性能的研究
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     Study on the Analysis Theory and Method of the Influence of Complex Concrete Dam Base to the Structure Behaviors of Dam Body
     复杂混凝土坝坝基对坝体结构行为影响的分析理论和方法研究
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     The Structure and Function of E.coli Era and Its Interactional Protein
     E.coli Era及其相互作用蛋白的结构与功能研究
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  “the structure”译为未确定词的双语例句
     The Structure Characteristics of Chagandelesu Fault Depression and Its Petroleum Accumulation Condition
     查干德勒苏凹陷构造特征及油气成藏条件
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     Study on the Structure of the Land Use Planning System of China
     中国土地利用规划体系结构研究
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     ON THE STRUCTURE AND RELATIONSHIP OF PHOROXYLON SCALARIFORME SZE
     一种木化石Phoroxglon scalariforme Sze的构造及其亲缘关系
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     THE STRUCTURE OF THE COMPOUND EYE OF THE RICE LOCUST.OXYA CHINENSIS THUNBERGE
     稻蝗Oxya chinensis Thunberge复眼构造
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     THE STRUCTURE OF SEMICONDUCTING METEPAALS AND THEIR ELECTRONIC ACTIVATION ENERGY
     半导性固态物质的結构及其电子活化能
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     " ,the structure
     兼及了“V他+……”结构的特征。
     The structure of P.C.
     大跨度预应力混凝土斜拉桥(简称P.C.斜拉桥)结构不仅经济、美观,而且可以采用悬臂浇筑方法施工、使这一桥型得以迅速推广。
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     On ITS Structure
     论ITS的结构体系
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     Research in "V 到" Structure
     “V到”结构研究
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  the structure
The paper studies generic commutative and anticommutative algebras of a fixed dimension, their invariants, covariants and algebraic properties (e.g., the structure of subalgebras).
      
In the case of 4-dimensional anticommutative algebras a construction is given that links the associated cubic surface and the 27 lines on it with the structure of subalgebras of the algebra.
      
The cohomology algebra of the classifying space of a compact Lie group admits the structure of ann-Hopf algebra, wheren is the order of the Weyl group; the homology with dual structure is also ann-Hopf algebra.
      
Using the properties ofn-Hopf algebras we show that certain spaces do not admit the structure of ann-valued group and that certain commutativen-valued groups do not arise by applying then-coset construction to any commutative group.
      
We also study the structure of the exceptional?-graded transitive Lie superalgebras and give their geometric realization.
      
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In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately...

In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately related,if the poten- tial function of the first molecule is written as V_1(φ)=A_1+Bcosφ+Ccos2φ+D_1cos3φ. Then those of the second and the third will be of the following forms: V_2(φ)=A_2+Bcosφ+Ccos2φ+D_2cos3φ V_3(φ)=A_3-Bcosφ-Ccos2φ+D_3cos3φ where D_i~'s(i=1,2,3)can be calculated from the potential barriers of CX_3-CX_3, CY_3-CY_3,CX_3-CY_3 or similar kinds of molecules,while the A_i~'s are not important for actual problems. In this paper we have also discussed the structures of hydrazine,ethyl alco- hol,hydrogen peroxide,and the meso and active forms of the CXYZ-CXYZ type of molecules.Besides,we have pointed out that the potential functions of both the meso and the active forms of the CXYZ-CXYZ type can be calculated from those of the CX_2Y-CX_2Y,CY_2Z-CY_2Z and CZ_2X-CZ_2X types.

本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋...

本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋转势函数经验式,从理论上提出了乙醇势函数的正确形式,并推断了乙醇的内旋转异构体。4.由内旋转势函数推得过氧化氢的结构,并推得联氨的可能结构,和实验结果相符合。并提供了一种实验方法,来判断联氨分子中的——因此也就是氨分子中的氮原子上独对电子的性格,是 s 还是 sp~3,或者接近于哪一种。 5.讨论了 CXYZ-CXYZ 内旋消式和活性式的内旋转问题,证明了它们的内旋转势函数,和 CX_2Y-CX_2Y、CY_2Z-CY_2Z 以及 CZ_2X-CZ_2X 的密切相关联。知道了后三者的势函数,前者的也就立刻可以计算。同时推测了 CXYZ-CXYZ内旋消式有两种内旋转异构体,活性式有三种,都以对位结构为最稳定。根据我们所讨论的,可以很清楚地看出:Pitzer 和 Crawford 等人所造的计算表已经不够用了。为了使得分子内旋转问题很好的向前发展,需要造一种以V_(φ)=A+B cosφ+C cos 2φ+D cos 3φ为内旋转势函数的计算表。

In continuing our work on sulfabenzothiazoles containing salt-forming groups, 2-sulfanilylamino-benzothiazole 6- and 5-(or 7-)carboxylic acids were obtained. Their sodium salts are very soluble in water and give neutral solutions. Through the same route,it failed to synthesize the corresponding 4-carboxylic acid,starting either from anthranilic acid or its ethyl ester.They did not give o-thioureidobenzoic acid or its ester,but cyclized to benzoylene thiourea(2- sulfhydryl 4-hydroxyl quinazoline).The same compound...

In continuing our work on sulfabenzothiazoles containing salt-forming groups, 2-sulfanilylamino-benzothiazole 6- and 5-(or 7-)carboxylic acids were obtained. Their sodium salts are very soluble in water and give neutral solutions. Through the same route,it failed to synthesize the corresponding 4-carboxylic acid,starting either from anthranilic acid or its ethyl ester.They did not give o-thioureidobenzoic acid or its ester,but cyclized to benzoylene thiourea(2- sulfhydryl 4-hydroxyl quinazoline).The same compound was obtained from the hydrolysis of α-o-carboxyphenyl β-benzoyl thiourea and from the ammoniolysis of o-isothiocyanobenzoic acid. Attempt to cyclize α-o-carboxyphenyl β-benzoyl thiourea by bromine to 2- benzamido-benzothiazole 4-carboxylic acid also failed,and the desulfured cyclized compound was identified to be 2-benzoyl benzoylene urea. We have,at the same time,cleared up the diversed results of H.Rupe and G.M.Dyson et al.and identified the structure of the Douglass and Dains' compound.

1.自对位和间位氨基苯甲酸综合了相应的具有羧基的磺胺苯并噻唑。它们的钠盐在水中溶解度极大,溶液呈中性。2.白间-硫脲基苯甲酸导出的苯并噻唑,其环化并合地位没有确定。3.自邻-氨基苯甲酸或它的乙酯依同样途径综合,得不到相应的苯并噻唑,产物是苯并嘧啶类型化合物。

4-Methyl-5-ethyl-2-thiouracil,m.p.211°,was prepared according to the direc- tions of Johnson and Baily.4-Methyl-5-ethyl-uracil,m.p.236°,was formed in a 81% yield from 4-methyl-5-ethyl-2-thiouracil by boiling the latter with an aqueous solution of monochloroacetic acid.4-Methyl-5-ethyl-uracil reacted with phosphorous oxychloride and phosphorous pentachloride,giving 4-methyl-5-ethyl-2,6-dichloropy- rimidine in a 79% yield.This dichloropyrimidine boiled at 145° at 23mm,at 120° at 9mm,at 130° at 10mm,or at 130°...

4-Methyl-5-ethyl-2-thiouracil,m.p.211°,was prepared according to the direc- tions of Johnson and Baily.4-Methyl-5-ethyl-uracil,m.p.236°,was formed in a 81% yield from 4-methyl-5-ethyl-2-thiouracil by boiling the latter with an aqueous solution of monochloroacetic acid.4-Methyl-5-ethyl-uracil reacted with phosphorous oxychloride and phosphorous pentachloride,giving 4-methyl-5-ethyl-2,6-dichloropy- rimidine in a 79% yield.This dichloropyrimidine boiled at 145° at 23mm,at 120° at 9mm,at 130° at 10mm,or at 130° at 11mm;and melted at 33°.This dichloropyrimidine reacted with sodium methoxide in methyl alcohol,with sodium ethoxide in ethyl alcohol,with sodium n-propoxide in n-propyl alcohol,with sodium isopropoxide in isopropyl alcohol,with sodium n-butoxide in n-butyl alcohol,with sodium isobutoxide in isobutyl alcohol,with sodium isopentoxide in isoamyl alcohol and with sodium benzoxide in benzyl alcohol,giving the corresponding 2,6-dimethoxy-pyrimidine(b.p.113°/13mm,107°/7mm,115°/15mm,or 125°/ 18mm,),2,6-diethoxy-pyrimidine(b.p. 143°/20mm),2,6-di-n-propoxy-pyrimidine (b.p.131°/5mm),2,6-di-isopropoxy-pyrimidine(b.p.114°/5mm),2,6-di-n-butoxy- pyrimidine(b.p.175°/7mm),2,6-di-isobutoxy-pyrimidine(b.p.155°/5mm),2,6-di- isopentoxy-pyrimidine(b.p.170°/5mm)and 2,6-di-benzoxy-pyrimidine (b.p.221°/ 3mm)respectively. 4-Methyl-5-ethyl-2,6-dimethoxy pyrimidine rearranged partially in the pre- sence of methyl iodide at room temperature into 2-oxy-3,4-dimethyl-5-ethyl-6- methoxy-pyrimidine, m.p.81°,the structure of which was established by its be- havior on hydrolysis in the presence of concentrated hydrochloric acid,giving 3,4-dimethyl-5-ethyl-uracil,m.p.170-171°.Nevertheless,4-methyl-5-ethyl-2,6-di- methoxy-pyrimidine rearranged with ease into the isomeric and stable configura- tion,1,3,4-trimethyl-5-ethyI-uracil(b.p.190°/7mm,m.p.99-100°)by merely heat- ing at 280°-290° for six hours.Furthermore,the partially rearranged configura- tion,like 2-oxy-3,4-dimethyl-5-ethyl-6-methoxy-pyrimidine,was only stable,however, at this lower temperature;and further transformation into the isomeric and com- pletely rearranged modification took place by heating at 335-350° for six hours. In this case,1,3,4-trimethyl-5-ethyl-uracil(m.p.99-100°)was similarly isolated.

(1)4-甲基5-乙基-2,6-二氯代嘧啶曾用磷醯氯和五氯化磷与其相应的2,6-二羟基嘧啶作用制取。(2)4-甲基-5-乙基-2,6-二氯代嘧啶与醇钠作用,极易转变成4-甲基-5-乙基-2,6-二烷氧基嘧啶。(3)4-甲基-5-乙基-2,6-二甲氧基嘧啶和2-氧代-3,4-二甲基-5-乙基-6-甲氧基嘧啶在高温时重排成其稳定构型的(或称内醯胺)的异构体:1,3,4-三甲基-5-乙基-2,6-二氧代嘧啶。另一方面,4-甲基-5-乙基-2,6-二甲氧基嘧啶用碘代甲烷处理并长久放置则仅仅发生部分重排作用,得到2-氧代-3,4-二甲基-5-乙基-6-甲氧基嘧啶。

 
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