最新刊期
      卷 25 ， 期 3 ， 1986
      • Vol. 25, Issue 3, Pages: 4-14(1986)
        摘要：According to the continental drift theory,the ancient ecology of the climateand geological vicissitude of the Cathaysian,Australian,South American,Afri-can,North American,Tropical Asian and Indian ancient lands or landmassesthroughout the Mesozoic Period are discussed.Subsequently,the characteristicsof the flowering floras of the ancient lands are analysed,the principal questionsunder discussion is concerning with the total amount,the composition and theantiquitic taxa,such as Magnoliales,Annonales,Ranunculales,Hamamelidales andthe orders of Amentiflorae,etc.And then,the discussed question falls on therelationship between the floras of the ancient lands and the Cathaysian flora.An interest and valuable existing State of affair has shown,that although theAustralian and the Antarctic landmasses was broke away from the mainland ofGongwana at the late Jurassic,but more than 40% of genera (998) are coexistingin Cathaysia and Australia; and in the proper order,a large amount of generaare found between the Cathaysia and India、Tropical Asia、north America、south America and Africa also.Thus it can be seen that the flowering plantswould be originate at the dawn of Triassic or Mesozoic,in other word,it wasoriginated before the breakdown of the unionized Pangaea,Such assessment isproved by the (?)ossils and the survived flowering plants.Following the driftinglandmasses,the flowering plants of all the continents are developed continuously along with the new environment.Lastly,a suggestion is given,that the Cathaysian flora is originated locally,since there are numerous primary taxa survived here which are not found fromother continents,and all the remaining landmasses either covered by the gra-cial or by the sea transgression,or by the droughty climate throughout theMesozoic Period,it is imposible to nurse the flowering plants,only the stabilized Cathaysia will become the cradle of the primary spermatophytes as well asof the flowering plants.  
          
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      • Vol. 25, Issue 3, Pages: 15-23(1986)
        摘要：The extraction properties of rare earth with α-isopropyl-β-isobutyl acrylicacid-n-hexane solution were studied,The distribution ratio and extraction pH1/21/23+3+3+3+  
          
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      • Vol. 25, Issue 3, Pages: 30-36(1986)
        摘要：Four alkyl methacrylates and their polymers have been prepared.The para-meters of Mark Houwink Sakurada relationship and Huggins’ coefficients of thepolymers were determined in n-heptane at 30℃ The characteristic ratio increa-sed with the length of alkyl groups and became larger in nonpolar solvent thanin polar solvent.  
          
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      • Xiao Jinsheng
        Vol. 25, Issue 3, Pages: 37-41(1986)
        摘要：This paper introduced a scheme of the translation of P-code.It can climin-ate thorough the trace of stack compnter,and use more effectively characteristicof single arithmetic unit,thus produce the object code that has better quality  
          
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      • Vol. 25, Issue 3, Pages: 42-48(1986)
        摘要：The application of the boundary—fitted coordinate systems to incompressibleviscous flow have been studied.Numerical examples using the presented methodsis obtained satisfactorily.  
          
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      • Ma Linjun,George Szeto
        Vol. 25, Issue 3, Pages: 49-52(1986)
        摘要：Let R be a ring with 1 and with an automorphism group G of order n for Someinteger n,C the Center of R,and RGGGGGGGGGGGG1ni  
          
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      • Chen Zhizhong
        Vol. 25, Issue 3, Pages: 58-65(1986)
        摘要：Little or no vein-type W-Sn deposits of Nanling region are not closely rel-ated with Yenshanian period granites in the region.The granites often occurredin complex rock bodies of multistage and metallogenesis may be closely relatedto small rock bodies intruded in latter stage.NE and EW great faults in theregion mainly controls the space distribution of complex rock bodies.The seco-ndary and/or derivative faults controls the emplacement of ore-forming graniteintruded in latter stage and also controls ore-field and deposits emplacement.Mineralizing crevasses of vein-type W-Sn deposits are secondary and/or deriva-tive crevasses arised from the faults controlling ore-field and deposits emplace-ment.Mechanically,the crevasses resulted principally from shear process buttheir charact(?)rs are jointly the features of shear-tension or shearcompression.Evolution of mineralizing crevasses during post-oreforming and oreforming periodis generally inheritable.The inheritance action during ore-forming resulted increvasses multi-openings and filling to form complex vein.  
          
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      • Vol. 25, Issue 3, Pages: 66-71(1986)
        摘要：After the mid-Holocene(6,000—7,000 years B.P.),sea invaded Zhujiang (PearlRiver) Delta,then retreated gradually.However,the transgression limits in Gua-ngzhou-Huaxian Plain,lying to the northwest of Guangzhou City,was not ascer-tained yet.In 1985,a layer of dark-grey clay or silty clay was discovered on the Plain.In this layer,besides terrestial fossils such as little pieces and seeds of plants,there are a large number of marine micro-fossils including planktons and benthos.Three conclusions are offered:1.This layer of clay or silty clay consisting of marine micro-fossils is a marinelayer.2.This layer distributes south to Yahu-Qishan-Xinhua-Longkou.Therefore,thatline should be the limits of Holocene transgression in Guangzhou-Huaxian Plain.3.This layer exists in 2-3m above sea level.Since the Plain submerged gener-ally at the rate of 0.59mm yearly during Holocene,this layer should have formed3—4m above mean sea level.It indicates that there is surely a high sea level inZhujiang delta in holocene.  
          
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      • Vol. 25, Issue 3, Pages: 72-78(1986)
        摘要：During ageing of peanut seeds,the increment of level of lipid peroxide wascorrelated with decreased levels of GSH (glutathion),Vc (ascorbate),Catalaseand SOD (superoxid dismutase).After treating with 100ppm Vc or 50ppm GSH,the vigor index of seedsgerminating for 3 days and vigor of seedling markedly raise.The best condition for peanut seeds is 100ppm Vc for 6 hours and 50 ppmGSH for 1 hour.In such conditions,the level of peroxide in seeds is the low-est,but the activity of catalase is highest.In the best condition,Vc scavenges peroxides of lipid fraction and insolublefraction,while GSH scavenges peroxides of lipid fraction and soluble proteinfraction,and leakage of K~+,protein,and the conductivity of peanut seeds isdecreased.It is showed that the function of membrane which regulated the leak-age of K~+ and other substances with the action of Vc or GSH is renovated.  
          
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      • Dai Shuilian
        Vol. 25, Issue 3, Pages: 79-83(1986)
        摘要：The author sorted out comprehensively the genus Echinochloa Beauv.fromour country,eight species and six varieties are reported;among them,four arenew records of distribution in China,one is new rank and three are new combina-tions.According to the characteristics,five groups are divided from the Chinesespecies.Moreover,the phylogenetic relationship among the groups are discussed,and additionally,an evolutionary programme were suggested.  
          
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      • Vol. 25, Issue 3, Pages: 84-91(1986)
        摘要：By means of optimization with a multilayer model,the damage profile ofion implanted Si can be obtained from a number of independent data measuredby spectroscopic ellipsometry as well as optical constants of crystalline and ionimplanted amorphous state of Si.We discussed the calculation principle of multi-layer models and,using a simulated test,analysed the mathematical procedure ofLevenberg-Marquardt optimization method with special attention to the influenceof model errors,calculating errors,rando merrors,systematic errors and nativeoxide layer on the surface of Si  
          
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      • Chen Shuguang,Li Xiqiang
        Vol. 25, Issue 3, Pages: 92-98(1986)
        摘要：Some nearly stoichiometric GaAs films have been prepared by rf sputteringand the relations between structure and composition of film and technologicalconditions have been investigated.The optical properties of samples have beenmeasured by spectroscopic ellipsometry.The results show that the absorptioncoefficient of GaAs film is much larger than that of the crystalline,but thedielectric constant and the optical gap are lower.We have used an effectivemedium approximation to calculate the volume fraction for several phases offilm,and the results have been discussed.  
          
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      • Wang Jie
        Vol. 25, Issue 3, Pages: 130-133(1986)
        摘要：Some properties of the p-t-reducibility and the sn-t-reducibility are prese-nted.For example,1.As NP and NPC are presentable (see[3]),and we haveshown here that there exists a set AεNP-P such that P~A(?)NP NPC under theassumptions that P≠NP and NP=co-NP,we ask if there exists a set A suchthat P~A=NP-NPC,We sak if there ehists a set A such that P~A=NP-NPC,or more generally,if NP-NPC is recursively presentable.We prove thatNP-NPC(?);2.We prove that there exist p-t-incomparable sets inEXP.As the best technique known for simulating deterministically anondeterministic polynomial time,it might be of some interests;3.Long (see[4]) showed that if NP≠co-NP,then for each BεNP-co-NP,there is a set AεNP-co-NP such that A(?) B.We consider this kind of problems in right direc-tion and we prove that for each A there exists B such that A(?) B,and ifNEXP~A=co-NEXP~A then BεNEXP~A.  
          
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