最新刊期
      期 1 ， 1995
      • Hang Desheng
        Vol. 13, Issue 1, Pages: 1-5(1995)
        摘要：The 12 Mev electron irradiation effect has been used to ture the commoon P+NN+ diodes into high frequency rectifying diodes. Compared with the traditional gold-doping technique, this method can control the life of the minority carriers more precisely. The Trr and Vf of the diodes can be better consistent and repeatable. And the high temperature performance is obviously improved. The rate of the qualified diodes is increased by a factor more than 30%.  
        关键词：Electron irradiation;High frequency rectifier diodes;τ-the life time of minority carriers;Trr-reverse recovery time;Vf-fwdvoltage   
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        发布时间：2023-04-23
      • Xiao Weiwei,Chen Keqiang
        Vol. 13, Issue 1, Pages: 6-11(1995)
        摘要：Gel fraction(%) of LDPE containing antioxidants and irradiated by fast electron beam(200 kGy) at ambient temperature and in air decreases by 6%—30% as compared with the control specimens. DSC measurement shows that the peak melting temperature Tm, enthalpy of fusion, peak crystallization temperature Tc and enthappy of crystallization of the irradiated LDPE are somewhat declined relative to that of unirradiated specimens. The second heating and cooling DSC run demonstrates that the Tm and Tc of all the samples studied in this work are not changed, but their enthalpies of fusion and crystallization tend to decrease. The cooling DSC reveals no influence of radiation on the blocky distribution of the branches in the LDPE used in this work. The X-ray diffraction analysis for the heat-treated samples demonstrates that irradiation does not cause appreciable change of the crystal structure and crystallite size of the samples, but the degree of the crystallinity of the irradiated samples is somewhat lower than that of unirradiated ones.  
        关键词：LDPE;Radiation crosslinking;Melting;Crystallization;DSC analysis;X-ray diffraction analysis;Branched chain distribution;Antioxidants   
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        发布时间：2023-04-23
      • Li Yu,Wang Yingting,Ma Zueteh,Zhang Qilong
        Vol. 13, Issue 1, Pages: 12-15(1995)
        摘要：The preirradiation polymerization process off-source of methylmethacrylate (MMA) was monitored in real-time by laser Raman probe. The characterestic Raman peaks of 1642 cm-1 and 600 cm-1 have been used as analytical lines to obtain the polymerization kinetic curve. The conversion of monomer was up to 86%. Analysing the results showed that the change in physical state of the system has effect on the activation of free radicals.  
        关键词：Raman spectra;Preirradiation polymerization;Methylmethacrylate;Kinetic study   
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        发布时间：2023-04-23
      • Liu Zhenhao,Zhou Zhiming,Ge Baoquan,Zhang Yingfa,Zhang Yuqin,Cheng Yunzheng,Zhou Zhenan,Chao Linfeng,Li Xinmin
        Vol. 13, Issue 1, Pages: 16-24(1995)
        摘要：We have applied magnet in under beam technology of EB irradiation crosslinking wire and cable. The facility composed of a under beam fixture with various magnets has the function of three irradiation models so that it reaches the requirement of all kinds of wire and cable from 0.5 mm2 to 400 mm2 in the core section including sector cross-section or from ϕ 1 mm to ϕ 40 mm in diameter and maxium diameter up to ϕ 60 mm is available. This article describes these three radiation models and their formulas about demanded energy, beam efficiency, radiation uniformity. Experimental data are corresponding to these formulas.  
        关键词：Electron beam;Wire and cable;Irradiation crosslinking;Magnet;Beam efficiency;Radiated uniformity   
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        发布时间：2023-04-23
      • Yi Xanjin,Ding Li,Jin Yizun,Ni Chuo,Wang Wenji,Yi Yuzhen
        Vol. 13, Issue 1, Pages: 25-28(1995)
        摘要：The radiobiological effects of thiol modifier BSO on retinoblastoma were studies using cultured retinoblasdtoma cell lines Y-79 and So-Rb 50 and retinoblastoma bearing nude mouse. The preliminary results shown that BSO can deplete intracellular GSH contents of retinoblastoma cells in vitro and vivo. In vitro data demonstrated that lowaand nontoxic concentration BSO increased the retinoblastoma cells radiosensitivity especially under the hypoxic condition.  
        关键词：BSO;Retinoblastoma;GSH (glutathione);Radiosensitization   
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        发布时间：2023-04-23
      • Liu Fenju,Su Liaoyuan
        Vol. 13, Issue 1, Pages: 29-32(1995)
        摘要：The monocyte-depleted peripheral blood mononuclear cells were separated into CD4+ and CD8+ subpopulations by panning technique with McAb CD4 and CD8. The purity of CD4+ and CD8+ cells was 89.2% and 85.8% respectively, which was estimated by an indirect immunofluorescence technique. The radiosensitivities of CD4+ and CD8+ cells and the effect of DNA synthesis in both cells' subpopulations influenced by Vit A were assessed by 3H-TdR incorporation. The experimental result showed that after γ-radiation in different doses on CD4+ and CD8+ cells, the 3H-TdR incorporation was significantly decreased. The 3H-TdR incorporation rate in CD 8+ cells irradiated with addition of 5 µg/ml Vit A increased significantly (p<0.05).  
        关键词：Vitamin A;CD4+ cell;CD8+ cell;3H-TdR;incorporation   
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        发布时间：2023-04-23
      • Rui Jingyi,Jin Jialan,Ma Xinsheng,Huang Peizhong,Ma Junhu
        Vol. 13, Issue 1, Pages: 33-37(1995)
        摘要：The dry seeds of 13 barley cultivars (strains) were irradiated by electron beam with expose doses of 100—300 Gy. The obviously biological damages, such as decreasing of seeding length, the length of first leaf, root length, surviving plant rate and fertility rate were observed in M1. The appropriate expose dose of electron beam for dry barley seeds was 100—200 Gy. The mutation frequence in M2 was 0.276%—3.84% at 100—200 Gy. Besides various mutants of chlorophyll defect a lot of mutants of morphological or physiological characters were obtained, such as height of plant, leaf type, ear type, ear lenght, awn type, ripe date, sterility and eceriferum It was showed that electron beam is one of valuable mutagenic sourses in mutation breeding. The result also showed that the different fertility rate in M1 treated with same dose could effect morpholoical mutation types in M2.  
        关键词：Electron beam;Barley;Surviving plant rate;Fertility;Mutation spectrum   
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        发布时间：2023-04-23
      • Fu Junjie,Jiang Hui
        Vol. 13, Issue 1, Pages: 38-41(1995)
        摘要：The present paper reports the influence of 60Co γ-irradiation on the activity of pancreatinum. The results show that the enzyme activity units are sensitive to irradiation. The activity decreased as the dose increased. The stability of the activity was tested with various durations of storage. The optimal dose is 6—8 kGy.  
        关键词：Radiation sterilization;Activity units;Enzyme;Pancreatinum;Amylopsin   
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        发布时间：2023-04-23
      • Chen Wenxiu,Jia Feng,Bao Huaying
        Vol. 13, Issue 1, Pages: 42-46(1995)
        摘要：The coloration, viscosity increasing and gaseous products induced by γ-ray in epoxy compounds have been reported previously. The changes of epoxide equivalent, hydroxy, carbonyl, unsaturated bond, degree of polymerization and gaseous products in E 51-618 epoxy resin γ-irradiated have been examined and evaluated by means of IR, UV, NMR and GC/MS, etc. The radiation induced products such as dipolymer(compound Ⅰ, ), oxidized hydroxy compound (compound Ⅳ, ) and gaseous products (compound Ⅴ, ) have been first found. The radical reaction machenism in above system was discussed.  
        关键词：Epoxy resin;γ-irradiation;Radiation effects   
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        发布时间：2023-04-23
      • Ju Xuecheng,Xu Maojun,Hu Hefeng,Ma Zueteh
        Vol. 13, Issue 1, Pages: 47-50(1995)
        摘要：In this paper, the curing process of UV curable systems was introduced using N-121 model UV Curing tester. Influence of the functionality of reactive diluents, the concentration of photoinitiator in curable composition and the UV light intensity on the curing reactivity were also investigated.  
        关键词：UV curing;Irradiation-strain method;Acrylic coating   
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        发布时间：2023-04-23
      • Jiang Ling,Xie Tongfeng,Xu Bingcai
        Vol. 13, Issue 1, Pages: 51-54(1995)
        摘要：In this paper, an epoxy acrylates UV curable coating for optical fiber was reported. The epoxy resins coating has good properties, for example, high cured rates, good mechanical properties and moderate adhesion to a quartz substrate. The coated optical fiber has high and low temperature resistance because of the flexibility. The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.  
        关键词：Epoxy acrylates;UV curable coating;Optical fiber   
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        发布时间：2023-04-23
      • Gao Yifei
        Vol. 13, Issue 1, Pages: 55-57(1995)
        摘要：The wide bore (0.53mm) flexible fused silica capillary column was successfully used for the determination of trimethylol acrylate system. The method can analyze solvent, A A, TMP, TMPDA and TMPTA in the system at the same time. Analysis precision is about 4.6%.  
        关键词：Trimethylolpropane acrylate;Gas chromatography;Wide bore capillary column;Inner standard method   
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        发布时间：2023-04-23
      • Li Miaozhen,He Junhui,Li Jun,Song Huaihai,Wang Erjian
        Vol. 13, Issue 1, Pages: 58-60(1995)
        摘要：Two different kinds of electron donating amines AH-Ⅰ and AH-Ⅱin combination with electron accepting diaryliodonium salts were used as a new type of photoinitiation system for radical polymerization sensitive to visible light. The AH-Ⅰ amines, such as aliphatic and aromatic amines, can only absorb light below 300—400 nm by themselves, but readily interact with iodonium salts to form a charge transfer complex (CTC), which extends the absorption largely into the visible range. The AH-Ⅱ amines, such as N-substituted derivatives of chalcone, coumarin ketone and styryl ketone, et al have a long conjugated structure and exhibit large absorbability in the visible range. These systems are stable in the dark, but rapidly undergo electron transfer reaction upon irradiation with visible light to generate initiating radicals. Both AH-Ⅰ/DPIO and AH-Ⅱ /DPIO systems can efficiently induce photopolymerization of acrylates, acrylonitrile and styrene, etc. The photopolymerization rates and related kinetic equations for several systems were studied.  
        关键词：Photopolymerization;Photosensitizer;Onium compounds;Amine   
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        发布时间：2023-04-23
      • Liu Qing,Li Fengmei,Shen Tao
        Vol. 13, Issue 1, Pages: 61-64(1995)
        摘要：Polyethylene oxide/Polyvinyl alcohol composite hydrogels were prepared by 60Co γ- radiation from PEO and PVA solution mixtures. The effect of radiation on the shear modulus and swelling degree was studied. The results show that the shear moduli of the composite hydrogels increase with the increase of radiation dose, but the swelling degree decrease with the increase of radiation dose. Also, composite hydrogels with high shear modulus and low swelling degree can be obtained from high concentration mixtures. The experiment result also shows that under certain radiation dose and certain concentration of mixture composite hydrogel with higher PVA ratio has higher shear modulus and lower swelling degree.  
        关键词：Radiation;Hydrogel;Polyethylene oxide;Polyvinyl alcohol   
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        发布时间：2023-04-23
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