International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry最新文献_第8页

Estimation of zirconium in Fe and Ti based alloys through formation of Zr-90m at 14.7 MeV neutrons 通过在14.7 MeV中子下形成Zr-90m来估计Fe和Ti基合金中的锆

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-09-01 DOI: 10.1016/1359-0197(92)90027-D

G.R. Pansare, P.M. Dighe, V.N. Bhoraskar

引用次数: 2

Effect of 60Co-gamma radiation on the binding properties in furs 60co - γ辐射对毛皮结合性能的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-09-01 DOI: 10.1016/1359-0197(92)90032-B

R.K. Raina

引用次数: 0

Paramagnetic molecular centers in the gamma-irradiated precipitates obtained in the system AlCl3-beta-alanine-NaOH alcl3 - β -丙氨酸- naoh体系中γ辐照沉淀物的顺磁分子中心

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-09-01 DOI: 10.1016/1359-0197(92)90029-F

Takialdin A. Himdan, Vesna Noethig-Laslo, Halka Bilinski

{"title":"Paramagnetic molecular centers in the gamma-irradiated precipitates obtained in the system AlCl3-beta-alanine-NaOH","authors":"Takialdin A. Himdan, Vesna Noethig-Laslo, Halka Bilinski","doi":"10.1016/1359-0197(92)90029-F","DOIUrl":"10.1016/1359-0197(92)90029-F","url":null,"abstract":"<div>The presented results are the continuation of our work on paramagnetic molecular centers in the model clay compounds. Here it was attempted to incorporate β-alanine in the aluminium hydroxide matrix. A series of precipitates were prepared with the highest ratio of β-alanine/Al = 0.22 obtained at pH = 7.X-ray diffraction analysis revealed in addition to amorphous precipitates, microcrystalline samples of four different X-ray patterns in nine precipitates, indicating variations in the structure of aluminium hydroxide matrix with incorporated β-alanine. Selected samples were exposed to γ-irradiation at 77 K, and at room temperature (293 K) in the presence and in the absence of air. In all the samples of amorphous structure no stable paramagnetic centers were determined by ESR after γ-irradiation in air.In all samples of microcrystalline structure similar stable paramagnetic centers were determined by ESR after γ-irradiation in air and in the evacuated tubes. These paramagnetic centers that we were unable to identify due to the poor resolution of the lines in the ESR spectrum can be most probably ascribed to structural defects introduced into the aluminium hydroxide matrix by β-alanine.In all amorphous samples γ-irradiated in the absence of air, the radical C̊H2CH2COOH formed by abstraction of amino group from the β-alanine was determined by ESR. The radical was unstable in air. Thus in the absence of air β-alanine may be considered as a storage site for the γ-irradiation energy in the amorphous aluminium hydroxides.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 3","pages":"Pages 225-231"},"PeriodicalIF":0.0,"publicationDate":"1992-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90029-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83338962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Solvent effects on the formation of cross-linking microspheres in γ-irridiated solutions 溶剂对γ-辐照溶液中交联微球形成的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90062-K

Yukihiko Naka , Yukio Yamamoto , Koichiro Hayashi

引用次数: 1

Polymerization of spin-casted epoxy films induced by electron beam or UV irradiation 电子束或紫外线辐照诱导自旋铸造环氧树脂膜聚合

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90075-Q

I. Fujita , Y. Tanaka , J. Takezaki

引用次数: 0

Localization and migration of excess electron in aromatic substituted polyacetylenes in solution 芳香族取代聚乙炔溶液中多余电子的定位和迁移

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90067-P

Masaaki Ogasawara , Takashi Suganuma , Naonori Junke , Hitoshi Yamaoka , Hiroshi Yoshida

{"title":"Localization and migration of excess electron in aromatic substituted polyacetylenes in solution","authors":"Masaaki Ogasawara , Takashi Suganuma , Naonori Junke , Hitoshi Yamaoka , Hiroshi Yoshida","doi":"10.1016/1359-0197(92)90067-P","DOIUrl":"10.1016/1359-0197(92)90067-P","url":null,"abstract":"<div>Optical absorption spectra of radical anions of poly(1-phenyl-1-propyne)(PPPr) and poly(phenylacetylene)(PPA) were studied in 2-methyltetrahydrofuran (MTHF). The radical anions of the polymers were obtained by γ-radiolysis at 77 K (and 4 K) and pulse radiolysis at ambient temperature and 140 K. There were two different trapping sites for electrons in PPPr dissolved in MTHF. The electron produced by ionizing radiation was initially trapped by a site to form the radical anion which gave rise to an absorption spectrum with λmax at 390 and 560 nm and a shoulder at ca 800 nm. In liquids or warmed matrices, the spectrum relaxed to a new one which was similar to that of the radical anion of trans-β-methylstyrene, a model compound of the polymer. The result suggested that an electron trapped by a shallow site was ultimately localised on a deeper site of the size of a monomer unit. In contrast, the absorption spectrum of PPA- showed a strong IR band which was attributed to a dimer-type radical anion. It was concluded therefore that the excess electron was delocalized over two monomer units in PPA. The difference was interpreted in terms of the twisted main chain structure of PPPr arising from the repulsive interactions between bulky phenyl groups and methyl groups of the polymer.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 2","pages":"Pages 111-116"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90067-P","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78785080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Publications and patents of Koichiro Hayashi 林光一郎的出版物和专利

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90061-J

引用次数: 0

On the degradation of polysilanes in solution. Flash photolysis and pulse radiolysis studies 聚硅烷在溶液中的降解研究。闪光光解和脉冲辐射解的研究

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90065-N

Carmen Peinado, Thomas Wollny, Wolfram Schnabel

{"title":"On the degradation of polysilanes in solution. Flash photolysis and pulse radiolysis studies","authors":"Carmen Peinado, Thomas Wollny, Wolfram Schnabel","doi":"10.1016/1359-0197(92)90065-N","DOIUrl":"10.1016/1359-0197(92)90065-N","url":null,"abstract":"<div>Polysilanes (catena-polysilicons) of the structure—SiR1R2—(R1, methyl; R2, phenyl, n-propyl, n-hexyl, β-phenethyl) and a copolymer (repeating units:—SiMe2—and—SiPhe2—) were irradiated with UV light (347 nm) or 15 MeV electrons. The dominant feature in both photolysis and radiolysis is main-chain scission. Typical quantum yields of main-chain scission determined by light scattering (LS) measurements are: φ(S) = 0.2 [poly(methyl-n-hexyl silane)] and φ(S) = 0.5 [poly(methyl-β-phenethyl silane)]. The radius of gyration rG depends on MW as rG ∝ MvW; v = 0.5. Flash photolysis and pulse radiolysis studies in conjunction with optical absorption and LS measurements revealed that main-chain cleavage occurs very rapidly (τ<20 ns). The resulting polymer fragments exhibit transient optical absorption probably originating from free radicals. The rate of decrease in LS intensity after the pulse corresponds to the rate of separation of fragments generated by main-chain cleavage. Regarding solutions of polysilane in liquids of bad solvent quality the rate of fragment separation is determined by the lifetime of contact pairs corresponding to physical interactions between polymer segments [at 23°C ca 100 μs in a 66/34 (v/v) mixture of 1,4-dioxane/1-propanol]. Moreover, it turned out that in benzene solution main-chain scission is sensitized by energy transfer from solvent to polysilane.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 2","pages":"Pages 101-106"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90065-N","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82962262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Elastic modulus formulae for a crosslinked network 交联网络的弹性模量公式

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90068-Q

A. Charlesby

{"title":"Elastic modulus formulae for a crosslinked network","authors":"A. Charlesby","doi":"10.1016/1359-0197(92)90068-Q","DOIUrl":"10.1016/1359-0197(92)90068-Q","url":null,"abstract":"<div>The usual formula for the elastic modulus E of a crosslinked highly elastic network E = 3 ρRT/Mc involves molecular weight between crosslinks Mc. It has to be modified by several factors such as the fraction not involved in any external stress and the initial molecular weight distribution. Several correction terms have been proposed. In this paper a fuller calculation is made for two initial molecular weight distributions, uniform and random, to see how far these corrections are valid. Even at high degrees of crosslinking a very significant proportion of the network does not participate in this elastic deformation.It may appear preferable to relate the elastic modulus E to the number of effective segments between crosslinks, independent of their molecular weight McE = 3ρkTQ(1 − s2)p where Q is the number of crosslinked monomer units per unit volume, and (1 − s2)p is a correction factor to allow for segments which are ineffective in an elastic deformation.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 2","pages":"Pages 117-120"},"PeriodicalIF":0.0,"publicationDate":"1992-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90068-Q","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75477185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Effect of solid phase on the selectivity of alkyl radical formation by gamma-irradiation of branched alkanes 固相对支链烷烃γ辐照形成烷基自由基选择性的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-08-01 DOI: 10.1016/1359-0197(92)90072-N

Hitoshi Koizumi, Masatoshi Hashino, Tsuneki Ichikawa, Hiroshi Yoshida

引用次数: 0