最新刊期
      卷 34 ， 期 3 ， 1995
      • Zhang Diming,Tian Chuan,Huang Hai
        Vol. 34, Issue 3, Pages: 1-9(1995)
        摘要：In this paper,the problem of hydrodynamic stability is studed.Taking plan-poiseuille-flow,as an example,a new asymplotic method proposed for overcomieng thelimitation of κ-σ method in nonlinear oscillation theory,is extended and is applied to theproblem of hydrodynamic stability. By a comparison with those of using κ-σmethod,itwas shown that this new asymplotic method in the study of hydrodynamic stability issuccessful.  
        关键词：nonlinear hydrodanamic stability;new asymplotic method;plan-poisuille-flow   
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      • Liang Xiting
        Vol. 34, Issue 3, Pages: 10-13(1995)
        摘要：Consider on G an integral functional of which the integrand depends on thegradient of u and on a parameter ε and satisfies certain nonstandard growth conditions。The local boundedness of the minimizer of the functional is proved. Furthermore, if theminimizer,u,satisfies suitable restrictive conditions,then it has locally Hldercontinuous fisst gradient;and on any compact suoset of G the Holder coefficient and theHolder exponent of the gradient of the minimizer are independent of u and ε,theminimizer and the parameter,respectively。  
        关键词：integral functional;nonstandard growth condition;minimizer;everywhereC￣(1;a)regularity   
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      • Shen Yaotian,Ma Ruaian
        Vol. 34, Issue 3, Pages: 14-19(1995)
        摘要：We consider the eigenvalue problem of elliptic Euler equations under the natural growth condition,we consider multiple integrals of the F(x,u,Du)then weknow that the variational problem under some sufficient conditions relevant to F(x,u,q),yields its solution.A similar method can be used to prove the existence of thesolution to the variational problem I(u),which I(u)is restricted on E.  
          
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      • Lai Jianhuang,Li Qiaoxiang
        Vol. 34, Issue 3, Pages: 20-25(1995)
        摘要：The importance of software-engineering-development speed in managinginformation system(MIS)development has been expounded.According to thecharacteristic of MIS and with his experience in software-developing,the authorintrodued a super-grading method which fits middle and small software development。The method not only retains the advantage of other system software development butalso speed up MIS software development。  
          
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      • Vol. 34, Issue 3, Pages: 26-30(1995)
        摘要：A kind of one -dimensional quasi-periodic grating is designed.Theselfsimilar diffraction spectra are evaluated and the influence of the phason strength onthe structure factor is studied。  
        关键词：quasi-periodic grating;selfsimilar   
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      • Fan Yangcai,Li Jingde,Fu Desheng
        Vol. 34, Issue 3, Pages: 31-35(1995)
        摘要：The concept of generalized admittance circles(GAC)is presented based onthe analysis of the cole-cole plot, admittance circles of piezoelectric vibrator andcomplex impedance of granular boundary ceramics.It is shown that GAC is a veryuseful concept for the measurement of dielectric materials.Debye relaxation is found todepend not only on the micro-mechanism of the matter,but also on the method ofmeasurement.The effect of inductance is observed in the electronic ceramics.  
        关键词： equivalent circuit;admittance circle;ceramics;granular boundary layer   
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      • Shao Yuanzhi,Lin Guangming
        Vol. 34, Issue 3, Pages: 36-39(1995)
        摘要：The Cu-sheathed rolling techuique is developed for forming a practical compoite rib-bon of room temperature magnetic refrigerant Gd1-zTbxpowder. The as- prepared ribbon, withboth excellent surface state and even thickness,shows good magnetocaloric effect.A discussionconcerning influence of the preparing parameters on magnetocaloric effect is given in detail。  
        关键词：magnetic refrigeration;intermetallics;magnetic materials   
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      • Lan Guoqiu,Tu Mingjing,Li Wei,Li Kun Human
        Vol. 34, Issue 3, Pages: 40-44(1995)
        摘要：The interface of Al23f  
          
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      • Wu Qing,Wang Haihua,Lin Shangan
        Vol. 34, Issue 3, Pages: 45-50(1995)
        摘要：Gas-phas polymerizations of ethylene have been performed over a prepolymerizedMgCl233322  
          
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      • Wang Zhiciai,Zheng Qihuang,Gao Bi,Fan Shiyan
        Vol. 34, Issue 3, Pages: 51-56(1995)
        摘要：Monoterpenoid,which is a basic fragment of cembranolide,was synthesized startingfrom guraniol,geranial and linalool specially produced in south China area. This paper laid em-phasis on the study of the allylic oxidation and halogenation. The suitable reaction mechanismwas proposed.  
          
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      • Huang Jingke,Wei Chunmei
        Vol. 34, Issue 3, Pages: 57-61(1995)
        摘要：The Diels-Alder reactions of 4,4-dimethoxythiobenzophenone（2）with sorbic acid oc-curred at room temperature to afford 83%cycloadduct and 17%isomer,while the reaction withsorbic acid methyl ester occurred at room temperature and the main cycloadduct was formed. The kinetic study showed that the Diels-Alder reactions of 2 with sorbic acid and its methylester are much slower than those with trans-1-substituted -1,3-butadienes.The reactions becomethe reversible due to the fact that the dienes have two substituted groups at C14  
          
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      • Du Xiuying,Liang Zhaoxi
        Vol. 34, Issue 3, Pages: 62-66(1995)
        摘要：In this paper,two unsaturated acrylated isocynates(AAT,NAT) were synthesizedfrom 2.4-TDI,equimolarβ-Hydroxy propyl acrylate and aliphatic alcohol by addition reaction.The photopolymerization of monomers under UV light radiation at 40℃ with the use of Darocur1173,DEAP,DMPA as the photoinitiator have been studied by dilatometry. The study hasshown that the activity of monomer NAT is higher than that of AAT.the efficiency of photoini-tiator decreased in the order of DEAP>DMPA>Darocur 1173 for both monomers,and the poly-merization rate was greatly influenced by solvent.  
          
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      • Hui Ping,Wang Jimei
        Vol. 34, Issue 3, Pages: 67-72(1995)
        摘要：We propose a model to discribe the effect of divalent cations on the activation processof Na─channels.The following are the results obtained from the model: For the activation pro-coss of Na─channels there exists a threshold of depolarization voltage;The increass of concen-tration of divalent cations results in increase of the threshold; The relaxation time of activationprocess and the maximum degres of activatcatcation are significantly related with the concentra-tion of divalent ions and with the depolarization voltage,The results mentioned above agree wellwith those obtained through experiments qualitatively and semi─quantitatively.  
        关键词：threshold;activation process;Na─conductance;all or none phenomenon   
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      • Liao Wenbo,Chang Hungta
        Vol. 34, Issue 3, Pages: 73-80(1995)
        摘要：Genera endemic to China in the spermatophyte flora of Guangdong province consistedof 40 families 75 genera and about 128 species;the percentages possessing the same group of Chi-na were:45.4% of families,23.4% of genera,and 17.0%of species.Among them containedplenty of the palaeoendemic genera,neoendemic genera,local endemic genera,and so on,ofwhich all were genera characteristic of Guangdong flora and formed a centre of endemism to Chi-na in Southwest Guangdong to Southeast Guangxi.Based on the analysis of the distribution ofthose endemic elements and ancient floristic histories in Guangdong province and its neighbour-hood ,Guangdong was one of the key regions of the orig ins of the Chinese flora or the Cathaysianflora.  
          
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      • Miau Ruhuai
        Vol. 34, Issue 3, Pages: 81-83(1995)
        摘要：In this paper 20 species collected by Joseph F.Rock from southeastern Xizang(Tibet),northwestern Yunnan and southwestern Sichuan of China in April-October 1932 are reported。Among them 14 species belong to Liliaceae,2 Iridaceae,1 Orchidaceae,1 Zingiberaceae, 2 Gen-tianaceae and 1 Compesitae of which 3 new taxa are proposed,namely Lilium Rockii Miau sp.nov.,Roscorea sichuanensis Miau sp.nov,Swertia tetragona Miau sp.nov,they are maifilydescribed and but then other species follow after them as an enumeration in this paper。  
        关键词：Lilium Rockii Miau;Roscorea sichuanensis Miau;Swertia tetragona Miau   
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      • Zhong Heng,Xie Yongquan,Liu Meiling,Zhang Yishun
        Vol. 34, Issue 3, Pages: 84-88(1995)
        摘要：When 0.5 mg/L CuSO4444444  
        关键词：wasts water;CuSO4;Chomydomonas;Tribonema   
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      • Vol. 34, Issue 3, Pages: 89-94(1995)
        摘要：The degree of amino acid racemization and ages of dozens of fossils teeth in deposit ofsome caves distributing in Zhaoqing,Yunfu,Fengkai,Yangchun in west Guangdong provincewere analyzed in this paper.The ages of these fossils were dated to be 2000～20000a BP,whichsuggests that they deposited from late stage of late Holocene to late stage of late Pleistocene. Onthe basis of these data,it was found that not only the fossils of the same period,but also the fos-sils of different periods were deposited in the identical layer in some caves.Therefore,it was in-ferred that the cave deposit may have undergone reformation and transpOrtation once again beforedepositing in the cave,which made fossils of various periods mix up in the same layer.This paperprovides some new evidences and a new method for studying more details on the evolution ofQuaternary mammal and on the paleoenvironment and paleoclimate。  
          
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      • Qiu Zhili,Qin Shecai,Pang Xuebin
        Vol. 34, Issue 3, Pages: 95-101(1995)
        摘要：Penglai of Hainan province is one of the important localities of sapphire in China.Thecorundum megacrysts ane related to Cenozoic alkali basalt and have the following features: hav-ing clear surface melted structure and containing Zircon&Tiniobite &CO2  
        关键词：corundum megacryst;genesis;alkali basalt   
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      • Yan Xiaopei,Cai Xiaobo
        Vol. 34, Issue 3, Pages: 102-108(1995)
        摘要：Since the economic reform in 1978,the dramatic increase of Chinese cities hasbeen accompanying the rapid development of economy.This paper focuses on the newly designated cities since 1978.Attention is initially paid to the characteristics of thenew cities,including the increase number and rate, the designation ways , provincial dif-ferences,and spatial pattern etc. Then their impacts on the city distribution are exam-ined.In addition,the problems related to the designation are discussed in hopes of pro-viding the references for improving the designation standards,constituting a rationalcity distribation,and supervising the Chinese urban development。  
        关键词： new cities;designation ways;spatial pattern   
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      • Chen Yaotai
        Vol. 34, Issue 3, Pages: 109-114(1995)
        摘要：The Pearl River mouth can be divided into five sedimentation divisions ac-cording to hydraulic environments,types,sizes and ingredient of the sediment,as wellas sedimentation rate and topogrophy.Sandy sedimentation division of runoff type is anactivest locality of sedimentation function in the Pearl River mouth and in chief of riveraction。Muddy sedimentation division of tidal type is famouset of tidal action,and afaster sedimentation area for fine sediments in the modern river mouth is withstood byshelf-water.Sdimentation division of relict sand is a local corrosion,and by chief ac-tion of invasion and control of shelf-water。 Mixing sedimetation division of the modernriver mouth and mixing sedimentation division of the shelf’s shallow sea-relict sedimentare located between theabove-mentioned three sedimentation divisions; their hydrauliccondhions and sedimentation characters have the attributes of the transhional environ-ment.  
          
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      • Qu Lianghu,Shi Suhua,Zhou Hui
        Vol. 34, Issue 3, Pages: 115-119(1995)
        摘要：Based on their structural characteristic,the nucleotide sequences of DA18S1and DA18S7 were aligned and compared with rDNA sequences from eight other species.The result of our analyses showed that neither of the two sequences was dinosaur rDNAfragment.DA18S7 turned out to be a plant rDNA frgment(more than 94%homologywith Malpighia coccigera),however,DA18S1 had high homology(88.3%and 89%)with two compared Fungi rDNA other than vertebrate rDNA(67.8%～74.1% only)  
        关键词：dinosaur egg fossil;Xixia;1 8s rDNA;sequence analysis   
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      • Huang Junchao,Ye Kenan,Li Baojian
        Vol. 34, Issue 3, Pages: 120-121(1995)
        摘要：This paper reports field experiment of hybride papaya artificial seeds wasdone successfully for the first time.  
        关键词：papaya;artificial seed;isozyme   
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      • Zhao Jian,Chen Wenbo,Xiao Kuiying,Liang Ruobiao
        Vol. 34, Issue 3, Pages: 122-124(1995)
        摘要：This system is produced for the analysis of stable or transient signals of noiseand vibration,By employing this system,technical parameters about noise &vibrationin engneering can be obtained,thus the funtion of noise & vibration detection is real-ized.In the development of this system,several kinds of advanced techniques in com-puter science,electronics,mechanics,digital signal processing are employed.The sys-tem has reached a high level in its design,functions and propertries。  
        关键词：noise;vibration;detection and analysis   
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      • Zhang Yueli,Xie Xiangshou,Zhou Changshi,Zhu Derui,Mo Dang
        Vol. 34, Issue 3, Pages: 125-128(1995)
        摘要：The Mn-doped（KNa）0.10.60.40.926  
          
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      • Fu Xiong,Zeng Longmei,Su Jingyu
        Vol. 34, Issue 3, Pages: 129-132(1995)
        摘要：Two polypropionate derivatives 1 and 2 have been isolated from the marinemoll use of Siphonaria japonia. Compound 1,reported previously,was further studiedby long range C/H correlation achieved by the use of the HMBC sequence。The struc-ture of compound 2 was elucidated with the spectral data of IR,UV,MS,￣1H and￣(13)C NMR。  
        关键词：Siphonaria japonia;polypropionate;long range correlation   
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