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  b-b
     The anion B10-H10= is a tetragonal hexadecahedron with its average bond length B-B (from the vertex to the atoms at the square plane) -1.706(4) A and B-B (between the other B atoms) = 1.830(5)A.
     B_(10)H_(10)~(2+)阴离子为四方(三角)十六面体笼状结构,主要键长平均值为:B—B(顶点到正方形平面原子)1.706A,B—B(其它原子间)=1.830。
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     Blood type “O-O” in 5 cases,“A-A”in 6 cases,“B-B”in 3 cases,“O-A”in 1 case,“O-B”in 3 cases. Donor kidneys were all from male cadavers.
     供体均为男性尸肾。 组织配型:血型:“O—O” 5例,“A—A” 6例,“B—B” 3例,“为O—A” 1例,“O—B” 3例。
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     Compared with that of Fe2B phase, the valence electron structure of Cr-containing Fe2B phase has been changed, which results in the improvement of the eigen-brittleness of the boride layer and the enhancement of the weak bond B-B in the Fe2B phase.
     结果表明,与Fe2B相相比,含铬Fe2B相的价电子结构发生了变化,导致弱键B—B键的成键能力得以提高、渗硼层的本质脆性得以改善;
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     The result indicates that the S 8 symmetry isomer of B 24N 24 cluster h, which contains 8 four-, 16 six- and 2 eight-membered rings, without direct B-B and N-N bondings, turned out to be the ground state.
     研究表明 :具有S8对称的含有 2个八元环、8个四元环和 16个六元环的结构h是B2 4N2 4笼状团簇最稳定的异构体 ,只存在B—N键 ,而无N—N和B—B键 .
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     In addition, two hydrogen atoms of hydrogen bridge are coplanar with three boron atoms where B-B (conjugated) equals to 1.734A and B-B (non-conjugated) 1.779A.
     B—B(氢桥连结)=1.734; B—B(非氢桥连结)=1.779。
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  “b—b”译为未确定词的双语例句
     and that the average coordination number for boron ions is 3.5, and the average distance is 2.46A.
     B离子(B—B)平均配位数为3.5,平均间距为2.46A。
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     The result's conclude that the conjugation between the B - HB - B three-center bond and the B-B-B one in B3H7 leads them mixed and to be turned into a four-center bond.
     因B—H_b、—B三中心桥键与B—B—B三中心键的相互作用,在B_3H_7中融合为一个四中心键;
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     The results showed that in unit cell of TiB 2 and ZrB 2 phases, the strongest bond is B—B bond(A bond), whose length is 3a/3, the valence electron number of the strongest bond has strong influence on the hardness of TiB 2 and ZrB 2 phases.
     结果表明 :TiB2 和ZrB2 相是靠键距为 3a/3的B—B最强键连接的 ,该键上的共价电子数影响化合物的硬度。
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     THE CONVEXITY CONNECTION OF NONPARAMETRIC TRIANGULAR CONVEX B B PATCHES OF QUADRIC
     非参数二次B—B三角凸曲面片的保凸拼接
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     To interpolate those data points which can not make up of topographic rectangle grid, an algorithm of interpolation surface base on Triangular Bernstein-B ezier Surface was suggested.
     针对给定的数据点无法构成拓扑矩形网格的情况,研究了基于三角B—B曲面的散乱数据点曲面插值算法。
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  bb
Conserved hypothetical BB0462 protein enhances the transcription activity of oppAV promoter
      
Borrelia burgdorferi BB0462 ORF encodes an unknown functional protein with 110 amino acids.
      
The co-transformation of BB0462 ORF and oppA upstream regulation DNA into E.
      
coli host cells and β-galactosidase activity assay demonstrated that the BB0462 protein enhanced the transcriptional activity of the oppAV promoter, but does not affect those of oppAI, II, III and IV promoters.
      
Analysis of DNA retardation and competitive repression also confirmed that the BB0462 protein bound to the 409 bp upstream regulation DNA fragment close to the initiation codon of the oppAV gene.
      
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A more general mathematical analysis of the kinetics of polycondensation-depolycondensation reactions is given in the article. Three different types of reactions are considered, namely, (1) reactions between molecules AB and AB, (2) reactions between molecules AA and BB, (3) reactions between molecules AA and BC. One of the condensation products is assumed (without loss of generality) to be water.For reactions of the first type, [p_n], the number of molecules of the n-mer (AB)_n, obeys the following Flory...

A more general mathematical analysis of the kinetics of polycondensation-depolycondensation reactions is given in the article. Three different types of reactions are considered, namely, (1) reactions between molecules AB and AB, (2) reactions between molecules AA and BB, (3) reactions between molecules AA and BC. One of the condensation products is assumed (without loss of generality) to be water.For reactions of the first type, [p_n], the number of molecules of the n-mer (AB)_n, obeys the following Flory distribution: [p_n]=N_0p~(n-1)(1-p)~2 where N_0 denotes the total number of AB segments (including the unreacted monomers). and p, as defined by is a measure of the degree of condensation. It is shown that p is the solution of the following differential equation: dp/dt=k/2N_0(1-p)~2-k_(-1)p[H_2O] where K and k_(-1) are velocity constants of condensation and hydrolysis respectively, and [H_2O] denotes the number of water molecules. Three special cases are discussed.For reactions of the second type, three different types of condensation products are possible besides water; they obey the following distributions: [p_(2n)]=2N′_0r~(n-1)p~(2n-1)(1-p)(1-rp) [p′_(2n-1)]=N′_0r~(n-1)p~(2n-2)(1-p)~2 [p″_(2n-1)]=N′_0r~(n-2)p~(2n-2)(1-rp)~2 where N′_0 and N″_0 denote the total number of segments AA and BB respectively, r denotes the ratio N′_0/N″_0, and p, as defined by is the solution of the following differential equation: dp/dt=kn′_0/r(1-p)(1-rp)-k_(-1)P[H_2O]For reactions of the third type, six different types of condensation products are possible besides water; they obey the following distributions: [P′_(2n)]=NP~(n-1)q~n(1-p/2-q/2)(1-p) [p″_(2n)]=Np~nq~(n-1)(1-p/2-q/2_(?))(1-q) [p_(2n-1)=Np~(n-1)q~(n-1)(1-p/2-q/2)~2 [p′_(2n-1)]=N/4p~(n-2)q~n(1-p)~2 [p″_(2n-1)]=N/4p~nq~(n-2)(1-p)~2 [p′″_(2n-n)]=∈(n)N/4p~(n-1)q~(n-1)(1-p)(1-q),where N denotes either the total number of segments AA or that of BC, while p and q, as defined by satisfy the following set of differential equations: dp/dt=k′N/2(1-p)(2-p-q)-k′_(-1)p[H_O] dq/dt=k″N/2(1-q)(2-p-q)-k″_(-1)q[H_2O]

本文討論AB型,AA和BB型以及AA和BC型分子间的缩聚-裂解反應,由動力学方程出發,得到这三种类型反應过程中高聚分子的分佈情况,并求得几种不同反應條件下的缩聚度p和q是何种時间的函数,利用它们和实验数值比較,可以求得縮聚反應速度常数K和水解反應速度常数k_(-1),并在AA和BC型分子间的反應中,可以求得K'和K″的此值,藉以比较官能團B和C的活潑度。还討論了三种平均分子量的表示式、数值以及它们相互的比值,後者僅在没有水解作用的情况下,才和Flory的结果相同。

1.The principal reactions of methylcyclohexane,methylcyclopentane and heptane on platinum-fluorine-alumina catalyst of various platinum and hydrogen fluoride contents(Pt,0~1%;HF,0~5%)have been investigated under fixed reaction conditions:temperature,472℃,pressure,20 atm.,LHSV,3,H_2:feed (mol.ratio),6:1.The main results of present investigation are found to be in good agreement with the reaction machanism and the dual function of“houdri- forming” catalyst suggested by Mills and Heinemann.Platinum-fluorine- alumina...

1.The principal reactions of methylcyclohexane,methylcyclopentane and heptane on platinum-fluorine-alumina catalyst of various platinum and hydrogen fluoride contents(Pt,0~1%;HF,0~5%)have been investigated under fixed reaction conditions:temperature,472℃,pressure,20 atm.,LHSV,3,H_2:feed (mol.ratio),6:1.The main results of present investigation are found to be in good agreement with the reaction machanism and the dual function of“houdri- forming” catalyst suggested by Mills and Heinemann.Platinum-fluorine- alumina catalyst consists of two important kinds of active sites,i.e.the dehy- drogenation(or metal)site and the isomerization(or acid)site;the former is derived from platinum and the latter from hydrogen fluoride.Dehydroisomeri- zation of methylcyclopentane and isomerization of n-heptane can proceed effec- tively only upon the dual site catalyst. 2.With platinum content fixed at 0.3%,the following results for the effect of hydrogen fluoride on the reactions of methylcyclopentane and n-heptane are obtained:for HF content below 1%,benzene yield of methylcyclopentane increases by increasing hydrogen fluoride content,for HF content greater than 1%,no further appreciable influence is observed.Isomerization of n-heptane is easier than dehydroisomerization of methylcyclopentane,so that catalyst of 0.2% HF is very efficient for isomerization of n-heptane.The major effect of hydrogen fluoride in excess of 0.2% is to accelerate hydrocracking reaction and thereby decrease liquid yield remarkably.A short discussion for these experimental re- sults is presented with the use of the recent information published by Wēbb, which shows how the surface acid strength of alumina is influenced by vary- ing the content of hydrogen fluoride.

铂-氟氢酸-氧化铝催化剂具有两种主要的活性中心;一种是由铂产生的脱氢中心,一种是由氟氢酸产生的异构化中心.甲基环己烷、甲基环戊烷、正庚烷在铂-氟氢酸-氧化铝催化剂上的主要反应结果符合于 Mills-Heinemann 提出的反应机理.催化剂的平均孔径随氟氢酸的含量增加而变大,孔径变大可能是正庚烷的加氢裂化反应随氟氢酸含量增加而显著加速的原因.

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我国露天矿穿孔爆破技术的发展方向应该在总结矿山生产经验、分析矿产资源特点、参考国外技术动向的基础上,根据国民经济发展的要求确定。 穿孔设备的发展,要在改进钢绳冲击钻机的同时,研究制造一批国外成功应用的潜孔钻机、牙轮钻机、回转钻机和钻车。其中应以潜孔钻机为主。 露天矿应推广铵油炸药,并生产高威力和防水炸药,满足不同矿山条件的需要。浆状炸药是一种有前途的炸药。 应加速推广微差爆破技术、逐步采用斜孔爆破。在一定条件下可以推广空气间隔装药。应进一步寻求更合理的装药结构、如在硬岩中研究不同威力炸药交替连续装药。爆破参数应当适当扩大炮孔鄰近系数、适当增大装药长度。

 
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