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  b-b
     GC′Continuity Between Two Adjacent B-B Interpolated Surface Patches over Triangles
     三角域上B-B插值曲面片的GC ̄1拼接条件
短句来源
     The Convexity of the B-B Surface Over Rectangle and theInvariance of Degree Elevation for Strongly Convex Net
     矩形域上B-B曲面的凸性与强凸自然网的升阶不变性
短句来源
     The problem of the convexity of the Bernstein-Bezier surface is one of the major comcernsin Computer Aided Geometric Design. The Convexity of the B-B surface is closely related to its controlnet, but how to define the B-net for the B-B surface over a rectangle has not been solved well. In thispaper, a concept of a natural net is presented and it is proved that a natural net with strong convexityis capable of in variance of the degree elevation.
     矩形域上Bernstein-Bezier曲面(简称B-B曲面)的凸性问题是CAGD(计算机辅助几何设计)中人们关注的热点之一.曲面的凸性与它的控制网的凸性有密切的关系,但是在矩形域上其B-网该如何定义一直得不到很好的解决.本文提出了一种新的网──自然网的概念,并且证明了强凸的自然网具有升阶不变性.
短句来源
     The knowledge guides in neural network by (B-B) BP and IMSBP.
     知识通过模式分类导入,并用IMSBP和(B-B)BP调节2种不同类型的权。
短句来源
  “b-b”译为未确定词的双语例句
     No σ-conjugation effect can take place be-tween the three separated three-center bonds in B3H9,whose proper-ties are fB-B=4.5964 nJ/m,fB-Hb-B=32.3066 nJ/m,fHb3cen=42.1337 nJ/m.
     但在B_3H_9中3个氢桥三中心键不相互作用,保持独立,其特征为f_B-B=4.5964nJ/m,f_B-Hb-B=32.3066nJ/m,f_Hb3cen=42.1337nJ/m。
短句来源
     The optimization calculations show that B(32) is the most stable cluster when 12 five-coordinated and 20 six-coordinated borons are not in the same spherical surface. Two kinds of obtained B─B distances (R(56),R(66)) verify Lipscomb's a set of empirical values.
     B32的优化计算结果表明,12个5配位与20个6配位两类硼原子不在同一球面时最稳定,而且所含两种B-B核间距离(R_(56)R_(66))的优化值验证了Lipscomb的经验数值。
短句来源
     Then the calculated curves such as ID─B、ID─△B、△B、and B─ωt,ID─ωt are obtained under direct and alternating field conditions respectively.
     计算了以冕玻璃、重火石玻璃为磁场 探头,在直流条件下的ID-B、ID-△ B、△ B-B计算曲线和交流条件下的B-ωt、 —t计算曲线;
短句来源
     Senbao I # can inhibit excessive growth and keep rejanenescence for larch seedling: A-B-B and A-B-C combination is optimum when those fungicides are mixed use.
     混合施用时。 A-B-B、A-B-C组合药剂最佳。
短句来源
     The relationship between Lagrange curves and B B curves is studied. A method of formulating a curve of polynomials with d degree is presented in which the end information is d i d t iG(j)(j=0,1,i=1,2,…,r<) and the inner information is P i=G(t i)(0
     通过对B-B曲线和Lagrange曲线相互关系的研究,给出端点信息为didtiG(j)(j=0,1,i=1,2,…,r<[d/2]),而内点信息为Pi=G(ti)(0<ti<ti+1<1,i=0,1,…,d-2r+2)的d次多项式曲线H(t)的一种构造方法,从而解决了“既插值给定的内点信息,又在连接点处r一阶光滑”的关键性问题
短句来源
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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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