最新刊期
      卷 26 ， 期 1 ， 1987
      • Vol. 26, Issue 1, Pages: 58-65(1987)
        摘要：The internal frictionQ-1of Cu（99.98%Cu） in the process of plastic deformation was measured by a middle torsion pendulum on a modified tensile testing machine. The effects of strain rate (in the range of 1.08×10-6/sec to 37.6× 10-6/sec) and frequency （in the range of 0.49 Hz to 4.16Hz）on Q-1were studied. The experimental data showed/that Q?increases with an increasing of ε（when f is constani） and/or ω-1（when ε is constant）, but the dependence of Q-1on ε or ω-1is not linear. The results of the data analysis indicated that the Q-1can be expressed as a sum of A（ε/ω） and B（ε/ω）1/2. The effect of the variation of dislocation average velocity with ε on the Q-1was discussed and the expression of average velocity of dislocation was obtained as function of ε.  
        关键词：internal friction;dislocation;plastic deformation;rate;frequency;response;copper   
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      • Vol. 26, Issue 1, Pages: 66-70(1987)
        摘要：A System of exact gravitational soliton solution of Einstein’s equations in vacuum is given. It is shown that, gravitational solitons exist, which are regular everywhere, nondispersive and stable, and which propagate with an invariable velocity. Finally, the singularity and the energy density of this gravitational soliton is discussed also.  
          
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      • Vol. 26, Issue 1, Pages: 71-77(1987)
        摘要：A novel polyhydroxylated steroid, sartortuosterol A, with rare 3a- and separated 6β- and 9α-hydroxyl groups, was isolated from the Chinese soft coral Sarcophyton tortuosum Tixier-Durivault. The steroid is a glass-like crystal with a formula C30H?O5, m.p. 227-9℃ and [a]D20+48.05. From the IR, MS, NMR data and comparing with its derivatives from Jones oxidation and then dehydration, the steroid was designated as 24- methyl 5α-cholestane-3α,6β,9α, 25-tetrol 25-monoacetate.  
        关键词： sterol;sartortuosterol A;Sarcophyton tortuosum;soft coral;Chemical constituent   
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      • Xie Songkai
        Vol. 26, Issue 1, Pages: 78-81(1987)
        摘要：The oxidative coupling of some ortho-substituted phenyllithium with ferric acetylacetonate was reported. This novel method of aryl-aryl coupling has advantages of readily available reagent, mild reaction conditions, and good yield of coupling products. Thus, di-tert-butyl 1,1’-biphenyl-2,2’-dicarboxylate,N,N-dimethyl benzylamine aind 2,2’-bis(N,N-dimethylaminomethyl)-1,1’-biphenyl had been dimerized by the method with satisfactory yield. The experimental details were described in this article.  
          
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      • Vol. 26, Issue 1, Pages: 82-88(1987)
        摘要：Two new Coordinetion Compounds tri (1-methylimidazole)cobalt(Ⅱ) sulfate and hexaimidazolecobalt(Ⅱ) were Synthesized. Their composition and properties have been explored with the aid of elemental analysis, TGA, DTA, IR, UV, NMR, x-ray powder pattern, magnetic susceptiblity and electrolytic conductivity. And what is more, the reasons for the coordination number of cobalt (Ⅱ) in tri(1-methylimidazole)cobalt(Ⅱ) smaller than that in the another Coordination Compounds of cobalt(Ⅱ) have also been discussed.  
          
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      • Vol. 26, Issue 1, Pages: 97-103(1987)
        摘要：Using the regular aerological data in the summers of 1981 and 1982, the relationship between the activities of the South China Sea typhoons and the circulation systems of the East Asia Monsoon is discussed. The results show: 1, The cross-equatorial air currents at about 105°E strengthened, and ITCZ developed when the cold high Over Australia intensified. The South China Sea typhoons occurred during the dates of descening of the cold high over Australia. 2, The South-west current is an important belt of energy transport for the generation of the typhoons. 3, The development of the Southern branch of the easterly jet and the downward transport of the momentum of the nothern branch of the easterly jet favour the development of the typhoons. 4. The cyclonic waves coming from the Western Pacific promote the generation of the lows over the South China Sea.  
        关键词： South China Sea typhoon;East Asia Monsoon   
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      • Vol. 26, Issue 1, Pages: 104-106(1987)
          
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