最新刊期
      卷 27 ， 期 4 ， 1988
      • Vol. 27, Issue 4, Pages: 1-8(1988)
        摘要：Various new variational principles are derived in a systematic manner from a transformed integral relation in linear theory of dynamic viscoelasticity, and the intrinsic relationship between the various variational principles can be explained clearly. With the new approach proposed by the author, the five-field, four-field, three-field, two-field and one-field new variational principles in terms of Laplace transforms can be established simply and directly.  
        关键词： variational principle;Laplace transform;dynamic viscoelasticity   
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      • Vol. 27, Issue 4, (1988)
        摘要：We prove some theorems on limit cycles of the system =y2-1  
          
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      • Vol. 27, Issue 4, (1988)
        摘要：This paper proposes the pre-efficiency based on classical geometric probability as a measurement of efficiency of integer labellings in simplicial fixed point algorithms. Numerical experiment shows that, higher pre-efficiency of labellings results higher efficiency of computations.  
          
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      • Vol. 27, Issue 4, Pages: 30-35(1988)
        摘要：We prove that the integral operator of the form preserves the class T of typically-real functions if δ and γ satisfy certain restrictions. The subclass T(α, β) of T, which has close relations with the above integral operator is defined. When β=1, T(α, 1) is the class of α-typically-real functions introduced by Skalska. Properties of T (α, β) are discussed and two radius problems are solved.  
          
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      • Vol. 27, Issue 4, Pages: 36-42(1988)
        摘要：AC Stark effect of optically pumped FIR lasers had becn studied theorctically and experimentally by many authors. All analysis were based on the assumption that the FIR signal intensity was much smaller than the pumping field intensity and the pumping power density was kept constant everywhere throughout the sample tube. This was not true, because there were energy exchange between the pumping and FIR signals, so the pumping power density decayed continuously along the sample tube and at the same time the FIR power density grew relevantly. So the AC Stark splitting measured at the output end of an optically pumped FIR laser(OPFIRL) systems with sample tube of different length should not be the same.According to the theoretical analysis, we concluded as follows: For an actual optical pumped FIR laser excited by pumping laser of constant power density with pumping detuning x=0, the AC Stark splitting and its spectral line width observed at the output end should not be the same for different length of sample tube. The longer the length of the sample tube, the AC Stark splitting would be smaller and the line width of the laser line would be broader. These effects would be more considerable if the pumping power density was smaller.  
          
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      • Vol. 27, Issue 4, Pages: 43-49(1988)
        摘要：Most experiments which test the transverse Doppler effect use the Mossbauer effect on a rotating dish—rotator. Because they are related to a rotational coordinate systera, they can be analysed in view of either special or general relativity. However, the former analyses in general relativity often simply use the principle of equivalence and thus can only explain the relative simple experiments. For more complex problems, it is difficult to explain perfectly if only the principle of equivalence is used. In this paper, we start from the general formula which was deduced by the fundamental principles of general relativity theory—the general relativity principle and the principle of equivalence, and use it to analyse the rotating dish experiment which tests the transverse Doppler effect. The formula can illustrate not only the simple experiments, but also the relative complex problems, and gives a better answer in general relativity theory. Thus, we affirm that the general relativity theory is of universal significance.  
          
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      • Vol. 27, Issue 4, Pages: 50-54(1988)
        摘要：The alanine ESR dosimeter is a new dosimeter which is used for measureing absorbed dose based on the quantitative evaluation of radiation induced free radicals by electron spin resonance spectrometer. The dose-responses of alanine for gamma-ray and for 2 Mev electron beam have been determined with ESR spectrometer of Model JES FEIXG. The zero dose reading, the lowest detection limit, the linarity and saturation regions of dose-response curves, and the effect of relative humidity during storage have been investigated. Meanwhile the D37 value has been given.  
          
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      • Vol. 27, Issue 4, Pages: 55-62(1988)
        摘要：Cyclo-[（gly） Thz-Pro-Leu-Val-（L&D）-（gln） Thz] （2） was synthesized. In this process, the thiazole amino acid, z-（L&D）（gln）ThzOH （6）, was obtained by directly condensing a thioamide with bromopyruvic acid; the formation of peptide bond was carried out with DCC and azide methods and the cyclzation with DPPA in high dilution (10-3-10-4M). The product has mp. 180-186℃ （uncorr.）, [α]D19-28.9℃（c 0.19, EtOH）. 2 is structurally similar but not identical to Dolastatin-3. The preliminary physiological activity test shows that 6 has an effect of inhibiting lung cancer A-549 cell in concentration at 30-50μg/ml and 2 in 10-30μg/ml, and z-（gly）Thz-Pro-Leu-ValOH has not such activity. In addition, the preparation of γ-benzyl glutamate was improved.  
          
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      • Vol. 27, Issue 4, Pages: 63-68(1988)
        摘要：The crystallization behaviors and thermalproperties of the blends composed of poly (vinylalcohol-n-vinylpyrrolidone) (P(VA—VP)) hydrolyzed from poly (vinylacetate-n-vinylpyrrolidone) (P(VAC—VP)) and polyvinyl alcohol (PVA) have been studied by means of DSC, The relationship between the glass transition temperatures of the blends and their compositions is fitted for the Fox equation quite well, suggesting that the blends are compatible. The results show that the melting point, the enthalpy of fusion, the crystal lamella thickness and the crystallinity of PVA decrease with an increase in P(VA—VP) content in the blends, but the mechanism of nucleation and the growth of the PVA crystals do not change. The effects of the blend composition on the half time and the kinetic rate constant of crystallization also have been discussed  
          
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      • Vol. 27, Issue 4, Pages: 77-88(1988)
        摘要：The diagnostic analyses are made on a case of Monsoon Depression over South China Sea in the Middle of Aug., 1979. The FGGE3B data, the diagnostic balance model and the cumulus parameterization scheme are used. The results show that the decisive physical process to the genesis and development of the depression is latent heating, among which the cumulus convection heating is the largest, meanwhile the temperature advection and vorticity advection are also obvious. The contribution of the other terms is small. The development of the depression attributes to the feedback between cumulus convection and the largescale environment field. The genesis and development of the depression can be explained by CISK mechanism  
          
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      • Vol. 27, Issue 4, Pages: 89-96(1988)
        摘要：Triacetonamine-HCl（TAA） is synthesized artificially based on the molecular structure of the substance isolated from South China Sea Juncella squamata. The electrophysiological effects of TAA on transmembrane potentials of isolated guinea pig papillary and atrial muscles were studied using conventional intracellular microelectrode technique.1. Under normal superfusion condition, TAA（5, 7.5, 10mM） caused a significant increase in ERP, APD and ERP/APD90maxNa2+2k2Na,b+2+six1k1  
        关键词： 三丙酮胺(TAA);抗心律失常;动作电位;慢通道阻滞;离子电流;心肌细胞   
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      • Vol. 27, Issue 4, (1988)
        摘要：Hybrid rice D-You-63, D-You-64, Ging-You-Zhong, Xie-You-64, Wei-You-64, Wei-You-35 and Hua-You-63 have more tillering capability and tiller number over their parents and CK variety ’Shuang-Gui-36’ with positive superdominance heterosis （hp） respectively, but L30lAx R29 has less tillers than the sterile line. Between tiller number and3214  
          
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      • Vol. 27, Issue 4, (1988)
        摘要：6-Benzoylaminopurine（xj-4） and 6-Furoylaminopurine （xj-5） are two new synthetic cytokinins prepared by department of chemistry, zhongshan university. Two bioassay were used to detect the activities of these two cytokinins, namely the method of redish cotyledon and the synergistic of cytokinin with IAA or Ca++  
          
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      • Vol. 27, Issue 4, (1988)
        摘要：A cell line, ZSU-SL-1, initiated in September, 1986, from embryos of cotton leafworm, Spodoptera litura was in 44th passages in September, 1987. The cell line consists of single, epithelial-like cells that are polyploid with chromosome numbefs ranging from 56 to 260. The growth rate was determined at 27℃ and 20℃, and doubting time was between 100-144 hr. The cell culture of Spodoptera litura can be heavily infected with both Spodoptera litura NPY and Trichoplusia ni NPV.  
          
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      • Vol. 27, Issue 4, (1988)
        摘要：The present paper reports the polymorphism occurring the three strains of Trypanosoma evansi found in South China (akinetoplast strain, horse strain and buffalo strain). A new form not previously reported is described here as a variant form. The cytoplasm and nucleus of this variant form is loose so that can be easily distinguied from the other forms such as slender form, short form and stumpy form. The average size of this new form is 20.2(l8.4～27.3)μm X 3.8(3.0～4.6)μm. It has been demonstrated by continous examinations of blood smears of infected mice for two full years that this variant form is a commonly present in all of the three strains of T. evansi in this country. This variant form can also be found in the blood smears of mice infected by the clones of the above three strains of T. evansi  
          
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      • Vol. 27, Issue 4, (1988)
        摘要：The movement of Bloch wall in （BiTm）3512  
          
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      • Vol. 27, Issue 4, Pages: 125-129(1988)
        摘要：The melting process of poly(butylene terephthalate) (PBT)/poly(ethylene terephthalate) (PET) blends has been studied by DSC. It has been found that components in the blends prepared by codissolution-coprecipitation crystallize separately, and the existence of PET suppresses the crystaliization of PBT. On the other hand, the melting behavior of blends made by melting mixture varies, changing from two melting peaks to one melting peak with increase of mixing time, which is ascribed to the ester exchange during mixing  
          
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      • Vol. 27, Issue 4, Pages: 130-133(1988)
        摘要：WATR method of1H NMR has been applied to direct determination of fresh fruit juice at the observe frequency of 89.55 MHz, proton exchange reagent 0.5-1.0 M NH4CI solution and pH=6.2. Thus the carbonhydrate components of various fruit juice were determined.  
        关键词：~1H NMR;WATR;fruit juice   
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