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With the increase of parameter α, the steady state bifurcation behaviour can be very complicated.


This result shows that the dynamics of this cellular automaton is actually complicated.


An array of complicated structures of the natural products synthesized over the last two years is also listed to serve as a convenient lead to the original literature for the prospective interested readers.


This experiment is easily carried out without timeconsuming and complicated pretreatment.


Although the structure of frequency shift filter is more complicated than the timedomain filter, it uses both time correlations and frequency spectrum correlations so it can achieve better performances on separating the overlapping signals.

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 Many methods of analyzing statically indeterminate structures are now available. The method of redundant forces and that of deformations (i. e. the slopedeflection method), heretofore generally used in the U. S. S. R., both require the solution of a system of simultaneous simple equations. In the case of multistorey and multibay bents, the large number of such equations would greatly complicate the calculation work, it being both timeconsuming and liable to make mistakes. The method of moment distribution... Many methods of analyzing statically indeterminate structures are now available. The method of redundant forces and that of deformations (i. e. the slopedeflection method), heretofore generally used in the U. S. S. R., both require the solution of a system of simultaneous simple equations. In the case of multistorey and multibay bents, the large number of such equations would greatly complicate the calculation work, it being both timeconsuming and liable to make mistakes. The method of moment distribution simplifies calculations to a great extent, as there is no need to solve simultaneous equations, and therefore it has been warmly received bY practical engineers. Many soviet scholars are also devoted to its study. There are, however, defects in this method, namely: (1) Should the moments obtained in the successive cycles of distribution and carryingover prove to converge very slowly, twenty or more such cycles must be done if fairly accurate results are expected.(2) In the case of analyzing structures under various conditions of loading, while it is possible to find the influence moments by applying a unit moment at each joint as proposed by Prof. Hardy Cross, it would bequite laborious in the case of multistorey and multibay bents containing a large number of members, especially when subjected to unsymmetrical loadings.For the remedy of the first defect, such Chinese scholars as Profs. Lin Tung Yen, Chao Tsu Wu, Meng Chao Li and Tsai Fang Yin have made much contribution, and the author of this paper has recently written a discussion on the two papers of the lastmentioned scholar. For the remedy of the second defect, the author is unaware of any except that mentioned below.One of the soviet scholars, Dr. P. P. Shaggin (i.e.) has suggested important improvements with regard to both these defects. For the former, he adopted a method of singlecycle distribution; and for the latter, he invented the method of successive conjugation which greatly reduces the work of calculation in finding the influence moments. The essence of these methods is wellworth studying on the part of our Chinese engineers. After an intensive study, the author of this paper thinks that, while Dr. Shaggin's methods are quite correct in principle, his methods of calculation can still be somewhat improved, as described herein, so as to be made more easily applied in practice.This paper Shaggin based upon the book, (Calculation of Multistorey Frames by the Method of Successive Conjugation) published in 1954 by Dr. P. P. Shaggin in Leningrad, U. S. S. R., shows that, in applying a unit moment at each joint of a given statically indeterminate structure, one can easily find the influence moments at the ends of all the members, and that, after multiplying the unbalanced fixedend moments at each joint calculated in accordance with the given external loads, by the respective influence moments, the sum of such products added to the original fixedend moments will give at once the actual moments at each end of the members in the structure.Three notable improvements are indicated in this paper:(1) Dr. Shaggin's formula (5") on page 11 of his book, has been altered to formulas (3) in this paper. (2) For multistorey bents, Dr. Shaggin's method of finding the conjugate moments (i. e. the influence moments) by formulas is replaced by the usual method of simple momentdistribution.(3) The author of the paper has extended the method to the analysis of multistorey and multibay bents under any system of unsymmetrical loading.Of course, for structures under a single system of loading, influence moments need not be found and, generally speaking, it would be more convenient to apply the original method of momentdistribution; for a multistorey bent, it would be better, even in this case, to modify it by applying the method of successive conjugation.The author is of the opinion that the application of the methods described in this paper, being convenient and timesaving, would be useful to the practical engineers.  本文以蘇聯學者沙金博士最近出版之“用逐次互聯法計算多層排架”一書为依據,叙述在已知超靜定結構中每一結點,施以單位力矩,可以很容易地求得各桿端的影響力矩;然後依照其所受外力荷載,求得各結点處的定端力矩,分別乘以相當的影響力矩,相加之後並加以原有的定端力矩,即得各該桿端的實際力矩。若結構承受多種多样的荷載(不問其為豎向的或平向的、對稱的或不對稱的),用此篇所述之方法以推算各桿端力矩,著者認為最便利、最省時,並且適合實際工作者之需要。  The present paper treats the compression of a rectangular block between two parallel rough plates as a problem in the theory of plane strain for perfectly plasticrigid materials.At first, the plasticrigid theory of plane strain was outlined, then, the solution to the present problem is briefly surveyed. In section 4, the case that is left out in the present literature, viz. when the widthheight ratio lies between 1 and 3.64 for partially rough plates is solved. In this treatment, the coefficient of friction... The present paper treats the compression of a rectangular block between two parallel rough plates as a problem in the theory of plane strain for perfectly plasticrigid materials.At first, the plasticrigid theory of plane strain was outlined, then, the solution to the present problem is briefly surveyed. In section 4, the case that is left out in the present literature, viz. when the widthheight ratio lies between 1 and 3.64 for partially rough plates is solved. In this treatment, the coefficient of friction ν is considered as constant along the contact surfaces. For eachμ, a critical value of the ratio w0/h is given. When w/hcomplicated.For w/h, the construction is again straightforward. The graphical construction used is described in detail in Appendix Ⅱ.The results of the solution are expressed in terms of Figs. 6 and 7, which show respectively: the average pressure on the plates vs. the widthheight ratio for different values of μ and the pressure distributions along the plates. Although the construction for the intermediate case, w0/h  本文将平行刚性压板间的塑性流动问题作为理想刚塑性的平面应变问题处理;先简单的复习理想刚塑性的平面应变问题,然后对本问题已做的部分作简短的介绍,再处理了现在还未解决的情形,那就是:当1  α, β, and γDichroine—3 isomeric alkaloids from the Chinese antimalarial herb "Chang Shan" (Dichroa febrifuga, Lour.), were investigated on anesthetized dogs for their effects on blood pressure, respiration, splenic and kidney volumes, and the activities of the heart, uterus and small intestines. Parallel observations were also made on isolated hearts, uteri and small intestines from several other species of animals. In the doses used the pharmacological actions of these alkaloids appeared to be identical... α, β, and γDichroine—3 isomeric alkaloids from the Chinese antimalarial herb "Chang Shan" (Dichroa febrifuga, Lour.), were investigated on anesthetized dogs for their effects on blood pressure, respiration, splenic and kidney volumes, and the activities of the heart, uterus and small intestines. Parallel observations were also made on isolated hearts, uteri and small intestines from several other species of animals. In the doses used the pharmacological actions of these alkaloids appeared to be identical qualitatively, and neither was there any marked quantitative difference. The lack of marked quantitative difference in their general pharmacological behavior is thus in strong contrast to their antimalarial activities, which vary tremendously from one another. These alkaloids, 2.5—10mg/kg given intravenously, produced a fall of blood pressure in all anesthetized dogs, usually associated with depressed cardiac contractions, and frequently an increase of the splenic and kidney volumes, while the respiration was not significantly affected. On the perfused rabbit heart, 0.2—2mg of them injected into the side tube of the cannula, always depressed the contractions, but in some cases slight augmentation preceeded the depression. The isolated frog heart was usually stimulated by the low concentrations of the alkaloidsand always depressed by their higher concentrations. In anesthetized dogs, the effects of these alkaloids on small intestines were inconsistent, stimulating in some cases and depressing in other cases; while the uterus was more commonly stimulated by them. In the concentrations used, these alkaloids always depressed the rabbit and dog intestines in vitro, but their effects on the isolated ileum of the guinea pig were dependant on the concentration, depressant in low concentrations, but usually stimulating or stimulating after transient depression in high concentrations. Their effects on the isolated uteri were still more complicated. On the rabbit nongravid uterus, their effects were in general not marked, in some cases there was slight stimulation and in other cases stimulation was preceeded by slight depression; but the gravid uterus was always stimulated by them. The nongravid uterus of the guinea pig was not significantly affected. As for the rat uterus, these alkaloids usually depressed the nongravid and stimulated the gravid ones. α, and βDichroine were also tested on the isolated nongravid uterus of a monkey; only stimulation was observed.  (一)本文報告常山鹼甲、乙、丙對於麻醉犬血壓、呼吸、聛腎容積、心收縮、在位小 腸與在位子宮的作用,並佐以它們對於離體心臟、小腸和子宮的作用觀察。三種常山鹼的藥理作用,在所用劑量時並無質的不同,亦無明顯的量的不同。和它們抗瘧作用的強弱懸殊,形成強烈的對此。 (二)對於麻醉犬,靜脈內注入2.5—10毫克/千克後,三種常山鹼都能降低血壓,呼吸無顯著變化。脾容積與腎容積多增加,心收縮則呈現振幅減小。 (三)離體兔心灌注時,從導管的側枝內注入0.2—2毫克常山鹼,能引起顯著的抑制,有時在抑制前可見輕微的興奮作用。對於離體蛙心,低濃度多產生興奮,高濃度則抑制之。 (四)對於麻醉犬的在位小腸,三種常山鹼在上述劑量時作用並不一致,有時興奮之,有時抑制之,對於子宮則多興奮之。 (五)對於離體兔腸與犬腸,常山鹼在所試劑量時,恆引起抑制。對於豚鼠空腸,則低濃度時抑制,高濃度時往往興奮之,或在短暫的抑制後繼以興奮。 (六)對於離體子宮的作用更為複雜,對家兔未孕子宮,一般作用不著,有時輕微興奮之,有時在興奮前略呈抑制。對於有孕子宮則均興奮之。豚鼠未孕子宮對常山鹼的效應一般不顯著。對大白鼠未孕子宮多抑制之,對其有孕子宮則多呈興奮作用。曾... (一)本文報告常山鹼甲、乙、丙對於麻醉犬血壓、呼吸、聛腎容積、心收縮、在位小 腸與在位子宮的作用,並佐以它們對於離體心臟、小腸和子宮的作用觀察。三種常山鹼的藥理作用,在所用劑量時並無質的不同,亦無明顯的量的不同。和它們抗瘧作用的強弱懸殊,形成強烈的對此。 (二)對於麻醉犬,靜脈內注入2.5—10毫克/千克後,三種常山鹼都能降低血壓,呼吸無顯著變化。脾容積與腎容積多增加,心收縮則呈現振幅減小。 (三)離體兔心灌注時,從導管的側枝內注入0.2—2毫克常山鹼,能引起顯著的抑制,有時在抑制前可見輕微的興奮作用。對於離體蛙心,低濃度多產生興奮,高濃度則抑制之。 (四)對於麻醉犬的在位小腸,三種常山鹼在上述劑量時作用並不一致,有時興奮之,有時抑制之,對於子宮則多興奮之。 (五)對於離體兔腸與犬腸,常山鹼在所試劑量時,恆引起抑制。對於豚鼠空腸,則低濃度時抑制,高濃度時往往興奮之,或在短暫的抑制後繼以興奮。 (六)對於離體子宮的作用更為複雜,對家兔未孕子宮,一般作用不著,有時輕微興奮之,有時在興奮前略呈抑制。對於有孕子宮則均興奮之。豚鼠未孕子宮對常山鹼的效應一般不顯著。對大白鼠未孕子宮多抑制之,對其有孕子宮則多呈興奮作用。曾試常山鹼甲、乙於一猴的未孕子宫,均有興奮作用。   << 更多相关文摘 
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