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CH4-Ar potential from beam scattering 束散射的CH4-Ar势
Physica Pub Date : 1974-12-01 DOI: 10.1016/0031-8914(74)90076-7
J.R. Brooks, A.E. Grosser
{"title":"CH4-Ar potential from beam scattering","authors":"J.R. Brooks,&nbsp;A.E. Grosser","doi":"10.1016/0031-8914(74)90076-7","DOIUrl":"10.1016/0031-8914(74)90076-7","url":null,"abstract":"<div><p>Lennard-Jones (<em>n</em>,6) potentials fitted to differential cross-section measurements for CH<sub>4</sub>-Ar, in conjunction with those from bulk-proeprty studies, confirm that the optimum value of the repulsive exponent <em>n</em> is 18–21.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 2","pages":"Pages 340-342"},"PeriodicalIF":0.0,"publicationDate":"1974-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90076-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81260745","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
Classical binary-encounter calculations of ionization by heavy charged projectiles 重带电抛射体电离的经典二元相遇计算
Physica Pub Date : 1974-12-01 DOI: 10.1016/0031-8914(74)90077-9
R.P. Singhal, Vir Singh
{"title":"Classical binary-encounter calculations of ionization by heavy charged projectiles","authors":"R.P. Singhal,&nbsp;Vir Singh","doi":"10.1016/0031-8914(74)90077-9","DOIUrl":"10.1016/0031-8914(74)90077-9","url":null,"abstract":"<div><p>Classical binary-encounter calculations have been performed for the K-shell ionization cross section of Al and Ni target atoms by <sup>1</sup><sub>1</sub>H, <sup>4</sup><sub>2</sub>He and <sup>7</sup><sub>3</sub>Li projectiles. The binding-energy correction due to the interaction of the projectile with target K electrons has been incorporated along with the correction due to Coulomb repulsion. It is found that the simple BEA theory can account for the experimentally observed deviation of the cross section from a <em>Z</em><sup>2</sup><sub>1</sub> dependence.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 2","pages":"Pages 343-345"},"PeriodicalIF":0.0,"publicationDate":"1974-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90077-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82390996","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
Cross-relaxation and constants of the motion 交叉松弛和运动常数
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90315-2
T. Shimizu
{"title":"Cross-relaxation and constants of the motion","authors":"T. Shimizu","doi":"10.1016/0031-8914(74)90315-2","DOIUrl":"10.1016/0031-8914(74)90315-2","url":null,"abstract":"<div><p>The dependence of the longitudinal dynamic susceptibility on the static magnetic field is studied theoretically. The susceptibility is expressed in terms of the collision operator. Eigenvectors of the collision operator with respect to zero eigenvalue are investigated by using perturbation theory. It is shown that the real part of the susceptibility coincides with the adiabatic susceptibility at harmonic fields and its dependence on the magnetic field near harmonic fields is of the Lorentz type.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 143-152"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90315-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75686272","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 approach to equilibrium of a multiple-component magnetic system 多分量磁系统的平衡方法
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90311-5
Th.W. Ruijgrok, H. Falk
{"title":"The approach to equilibrium of a multiple-component magnetic system","authors":"Th.W. Ruijgrok,&nbsp;H. Falk","doi":"10.1016/0031-8914(74)90311-5","DOIUrl":"10.1016/0031-8914(74)90311-5","url":null,"abstract":"<div><p>A magnetic system is considered, which consists of domains with submagnetizations <em>m<sub>r</sub></em> (<em>r</em> = 1, 2, …, <em>M</em>). Equations describing the evolution of <em>m<sub>r</sub></em>(<em>t</em>) are studied and it is shown that there is a rapid transition towards a “scaling state”, followed by a slow approach to equilibrium. Near the critical temperature these effects are most pronounced.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 91-96"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90311-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82540185","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 lattice model of gas-gas equilibria in binary mixtures 二元混合物中气-气平衡的晶格模型
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90305-X
J.T. Bartis, C.K. Hall
{"title":"A lattice model of gas-gas equilibria in binary mixtures","authors":"J.T. Bartis,&nbsp;C.K. Hall","doi":"10.1016/0031-8914(74)90305-X","DOIUrl":"10.1016/0031-8914(74)90305-X","url":null,"abstract":"<div><p>A two-component decorated lattice model is introduced to study critical phenomena and phase equilibrium in binary fluids. For certain ranges of interaction parameters, the model demonstrates gas-gas equilibria of the first and second types. Since no assumption of analyticity is made, the model yields non-classical critical behavior. In particular, at the critical double point (the coalescence of two critical points), the exponent β which, before the coalescence, describes the shape of the isothermal coexistence curves in the pressure-mole fraction plane, is changed to 2β. It is shown that this renormalization of β is in agreement with the phenomenological theory of Griffiths and Wheeler.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 1-21"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90305-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82799203","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: 20
Electron-phonon interactions and the states of a crystal electron in an external electric field 电子-声子相互作用和晶体电子在外电场中的状态
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90308-5
D.J. Bergman, O. Entin-Wohlman
{"title":"Electron-phonon interactions and the states of a crystal electron in an external electric field","authors":"D.J. Bergman,&nbsp;O. Entin-Wohlman","doi":"10.1016/0031-8914(74)90308-5","DOIUrl":"https://doi.org/10.1016/0031-8914(74)90308-5","url":null,"abstract":"<div><p>The effect of the electron-phonon interactions on the states of a single tightly bound electron in a one-dimensional crystal in an external electric field <em>F</em> is discussed with the help of a master equation for the occupation probabilities of electron states. It is found that the occupation probabilities of the Stark ladder states usually do not provide a good description of the state of the system despite the fact that these were eigenstates in the absence of the interactions. A good description is possible in terms of the occupation probabilities of time-dependent band states with <span><math><mtext>k(t) = k</mtext><msub><mi></mi><mn>o</mn></msub><mtext> + eFt/</mtext><mtext>h</mtext><mtext>̵</mtext></math></span> since these probabilities satisfy a markoffian master equation.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 45-63"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90308-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91725725","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
On the time evolution of large systems. A soluble model 大系统的时间演化。可溶模型
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90314-0
H.J. Kreuzer, K. Nakamura
{"title":"On the time evolution of large systems. A soluble model","authors":"H.J. Kreuzer,&nbsp;K. Nakamura","doi":"10.1016/0031-8914(74)90314-0","DOIUrl":"https://doi.org/10.1016/0031-8914(74)90314-0","url":null,"abstract":"<div><p>We study the time evolution of a large system consisting of two kinds of particles that can be transformed into each other by an external field. Hydrodynamic equations are derived. The approach to equilibrium of densities and correlation functions is oscillatory with a slowly decaying amplitude like <em>t</em><sup>−<span><math><mtext>1</mtext><mtext>2</mtext></math></span></sup> for large times <em>t</em>. Generalized <span><math><mtext>H</mtext></math></span> theorems hold, but for large <em>t</em> the <span><math><mtext>H</mtext></math></span> quantity again oscillates around the new equilibrium value. Possible removal of these oscillations by coarse-graining is discussed.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 131-142"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90314-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91725729","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
Note on “binary kernel and pair distribution functions” 关于“二进制核函数和对分布函数”的说明
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90322-X
A. Isihara
{"title":"Note on “binary kernel and pair distribution functions”","authors":"A. Isihara","doi":"10.1016/0031-8914(74)90322-X","DOIUrl":"https://doi.org/10.1016/0031-8914(74)90322-X","url":null,"abstract":"","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Page 198"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90322-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91725731","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 model spin Hamiltonians including long-range ferromagnetic interaction 包含长程铁磁相互作用的模型自旋哈密顿子
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90319-X
J.G. Brankov , A.S. Shumovsky , V.A. Zagrebnov
{"title":"On model spin Hamiltonians including long-range ferromagnetic interaction","authors":"J.G. Brankov ,&nbsp;A.S. Shumovsky ,&nbsp;V.A. Zagrebnov","doi":"10.1016/0031-8914(74)90319-X","DOIUrl":"10.1016/0031-8914(74)90319-X","url":null,"abstract":"<div><p>A thermodynamically equivalent hamiltonian is constructed for a general spin-<span><math><mtext>1</mtext><mtext>2</mtext></math></span> system including infinitely long-range interaction of a ferromagnetic type. A rigorous proof is given for the thermodynamical equivalence.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 183-186"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90319-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80922029","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: 21
A class of transformations on the Dirac Hamiltonian 狄拉克哈密顿量上的一类变换
Physica Pub Date : 1974-11-15 DOI: 10.1016/0031-8914(74)90321-8
A.R. Tekumalla
{"title":"A class of transformations on the Dirac Hamiltonian","authors":"A.R. Tekumalla","doi":"10.1016/0031-8914(74)90321-8","DOIUrl":"https://doi.org/10.1016/0031-8914(74)90321-8","url":null,"abstract":"<div><p>We give a new generalization of the Foldy-Wouthuysen transformation and show a simple and elegant method of obtaining explicit forms of the Foldy-Wouthuysen transformation and its generalizations by using the <em>U</em>-matrix method of Ramakrishnan. We also show how this method can be used to obtain the transformation which connects the Dirac equation to the non-covariant form of the Dirac equation recently discussed in the literature.</p></div>","PeriodicalId":55605,"journal":{"name":"Physica","volume":"78 1","pages":"Pages 191-197"},"PeriodicalIF":0.0,"publicationDate":"1974-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8914(74)90321-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91725733","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
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