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Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology最新文献

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Homogeneous critical assembly with profiled fuel loading 具有异形燃料装载的均匀临界组件
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90112-1
A.K. Krasin, E.I. Inyutin
{"title":"Homogeneous critical assembly with profiled fuel loading","authors":"A.K. Krasin, E.I. Inyutin","doi":"10.1016/0368-3230(66)90112-1","DOIUrl":"10.1016/0368-3230(66)90112-1","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 697-700"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90112-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76418821","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
The relative yields of delayed neutron groups in the photofission of 238U 238U光裂变中延迟中子群的相对产额
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90116-9
O.P. Nikotin, K.A. Petrzhak
{"title":"The relative yields of delayed neutron groups in the photofission of 238U","authors":"O.P. Nikotin, K.A. Petrzhak","doi":"10.1016/0368-3230(66)90116-9","DOIUrl":"10.1016/0368-3230(66)90116-9","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 711-712"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90116-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88849112","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
A variational description of dissipative processes 耗散过程的变分描述
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90104-2
G.C. Pomraning
{"title":"A variational description of dissipative processes","authors":"G.C. Pomraning","doi":"10.1016/0368-3230(66)90104-2","DOIUrl":"10.1016/0368-3230(66)90104-2","url":null,"abstract":"<div><p>The Roussopoulos variational formalism is applied to equations with a first-order time derivative. The resulting functional is a very general variational characterization of dissipative processes in that it admits trial functions which do not satisfy the equation of interest, do not satisfy the boundary conditions, and are not continuous. It is shown that the previous functionals presented in the literature for this type of problem are special cases of this more general functional. The use of this variational principle to estimate a rather general class of characteristics of interest is discussed. It is also pointed out that this general functional is not unique and arguments are given to deal with this non-uniqueness. The variational description of the Sturm-Liouville equation is considered in this same generality. This leads to a generalization (to a more complete class of admissible trial functions) of the classical Rayleigh quotient for estimating eigenvalues.</p></div>","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 617-634"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90104-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91456565","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: 10
Diffusion length calculations in water 水中扩散长度计算
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90107-8
I.C. Goyal, A.K. Ghatak
{"title":"Diffusion length calculations in water","authors":"I.C. Goyal,&nbsp;A.K. Ghatak","doi":"10.1016/0368-3230(66)90107-8","DOIUrl":"10.1016/0368-3230(66)90107-8","url":null,"abstract":"<div><p>An extensive series of calculations have been performed to determine the asymptotic neutron energy spectra and diffusion lengths in water poisoned by absorbers like boron, cadmium and gadolinium at different concentrations. The effect of chemical binding has been studied by comparing the results obtained by using the well-known Nelkin model of water with the free-gas model for hydrogen. Diffusion theory has been used in making the calculations; however, to test the validity of the diffusion approximation, in a few cases we have also made some transport theory calculations and compared the two results. We find that even for fairly large absorptions (i.e. for <span><math><mtext>κ</mtext><mtext>Σ</mtext><msub><mi></mi><mn><mtext>min</mtext></mn></msub><mtext> ≈ 0·7–0·8</mtext></math></span>) diffusion theory gives results which compare well with those obtained by using transport theory.</p></div>","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 659-665"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90107-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77736732","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
Semi-empirical formula for the change of diffusion coefficients caused by empty channels 空通道引起扩散系数变化的半经验公式
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90109-1
R. Persson
{"title":"Semi-empirical formula for the change of diffusion coefficients caused by empty channels","authors":"R. Persson","doi":"10.1016/0368-3230(66)90109-1","DOIUrl":"10.1016/0368-3230(66)90109-1","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 671-673"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90109-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82685264","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
Pseudo-exponential decay of a neutron pulse in small beryllium systems 小铍系统中中子脉冲的伪指数衰减
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90106-6
J. Wood
{"title":"Pseudo-exponential decay of a neutron pulse in small beryllium systems","authors":"J. Wood","doi":"10.1016/0368-3230(66)90106-6","DOIUrl":"10.1016/0368-3230(66)90106-6","url":null,"abstract":"<div><p>The decay of a neutron pulse in beryllium is studied by solving, numerically, the homogeneous Boltzmann equation and fitting the amplitudes to an instantaneous slowing down source. The kernel used is the multi-phonon expansion, with a Debye phonon frequency distribution.</p><p>It is found that for <em>B</em><sup>2</sup> &lt; 0·033 cm<sup>2</sup>, the neutron evolution is soon dominated by a single, exponentially decaying mode; but for <em>B</em><sup>2</sup> &gt; 0·033 cm<sup>−2</sup>, it is likely that only a continuous spectrum of eigenvalues exists. However, this continuum exhibits an almost exponential behaviour and is interpreted as possessing an effective decay constant. This effective decay constant is compared with experimental values, for <em>B</em><sup>2</sup> up to 0·1 cm<sup>−2</sup>, and is suggested as an explanation of those measured decay constants which exceed [<em>νΣ</em>]<sub>min</sub>.</p></div>","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 649-657"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90106-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85226587","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: 7
Angular distributions of fast neutrons scattered by medium and heavy nuclei 中重核散射快中子的角分布
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90113-3
A.G. Guseinov, M.N. Nikolaev, A.G. Dovbenko, V.E. Kolesov, V.N. Morozov
{"title":"Angular distributions of fast neutrons scattered by medium and heavy nuclei","authors":"A.G. Guseinov,&nbsp;M.N. Nikolaev,&nbsp;A.G. Dovbenko,&nbsp;V.E. Kolesov,&nbsp;V.N. Morozov","doi":"10.1016/0368-3230(66)90113-3","DOIUrl":"10.1016/0368-3230(66)90113-3","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 700-705"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90113-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98012345","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
International neutron source calibrations 国际中子源校准
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90114-5
O.L. Andreev, Yu.S. Silin, G.M. Stukov, V.I. Fominikh, V.T. Shchebolev, I.A. Yaritsina
{"title":"International neutron source calibrations","authors":"O.L. Andreev,&nbsp;Yu.S. Silin,&nbsp;G.M. Stukov,&nbsp;V.I. Fominikh,&nbsp;V.T. Shchebolev,&nbsp;I.A. Yaritsina","doi":"10.1016/0368-3230(66)90114-5","DOIUrl":"10.1016/0368-3230(66)90114-5","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 706-708"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90114-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89570751","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
On the persistent change in the measured values of the decay constant in beryllium 铍衰变常数测量值的持续变化
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90108-X
I.C. Goyal, A.K. Ghatak, L.S. Kothari
{"title":"On the persistent change in the measured values of the decay constant in beryllium","authors":"I.C. Goyal,&nbsp;A.K. Ghatak,&nbsp;L.S. Kothari","doi":"10.1016/0368-3230(66)90108-X","DOIUrl":"10.1016/0368-3230(66)90108-X","url":null,"abstract":"","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 667-670"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90108-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74900760","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: 2
Study of the process of neutron moderation in beryllium and beryllium oxide by the impulse method 用脉冲法研究铍和氧化铍中子中速减的过程
Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology Pub Date : 1966-08-01 DOI: 10.1016/0368-3230(66)90111-X
I.F. Zhezherun
{"title":"Study of the process of neutron moderation in beryllium and beryllium oxide by the impulse method","authors":"I.F. Zhezherun","doi":"10.1016/0368-3230(66)90111-X","DOIUrl":"10.1016/0368-3230(66)90111-X","url":null,"abstract":"<div><p>The neutron slowing down time to energies 1·46, 0·3, 0·178 and 0·0976 eV and also the thermalization time below ∼0·1 eV have been measured. The time dependence of slowing down neutrons at 0·3 eV was obtained. The measurements made it possible to compute the correction for neutron moderation in the energy range below 1·46 eV and to obtain the square of the fission neutron slowing down length to various energies close to the thermal region.</p></div>","PeriodicalId":100815,"journal":{"name":"Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology","volume":"20 8","pages":"Pages 683-695"},"PeriodicalIF":0.0,"publicationDate":"1966-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0368-3230(66)90111-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85301327","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
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