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On ``GSI Oscillations'' as Interference of Two Closely Spaced Ground Mass Eigenstates of H-Like Mother Ions “GSI振荡”作为类h母离子两个紧密间隔的基质本征态的干扰
Research Letters in Physics Pub Date : 2009-08-30 DOI: 10.1155/2009/524957
M. Faber, A. Ivanov, P. Kienle, E. L. Kryshen, M. Pitschmann, N. I. Troitskaya
{"title":"On ``GSI Oscillations'' as Interference of Two Closely Spaced Ground Mass Eigenstates of H-Like Mother Ions","authors":"M. Faber, A. Ivanov, P. Kienle, E. L. Kryshen, M. Pitschmann, N. I. Troitskaya","doi":"10.1155/2009/524957","DOIUrl":"https://doi.org/10.1155/2009/524957","url":null,"abstract":"We analyse the hypothesis that the “GSI oscillations” of the K-shell electron capture decay (EC) \u0000rates of the H-like heavy ions are caused by quantum beats from a coherent state of two closely spaced ground mass-eigenstates |𝑚⟩ and |𝑚⟩ of decaying H-like heavy ions. We apply this mechanism to the calculation of the 𝛽","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116139405","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 Appearance of a Cooper Minimum in the Photoionization Cross Sections of the Plasma-Embedded Li Atom 等离子体嵌入Li原子光电离截面中库珀最小值的出现
Research Letters in Physics Pub Date : 2009-07-14 DOI: 10.1155/2009/832413
S. Sahoo, Y. K. Ho
{"title":"On the Appearance of a Cooper Minimum in the Photoionization Cross Sections of the Plasma-Embedded Li Atom","authors":"S. Sahoo, Y. K. Ho","doi":"10.1155/2009/832413","DOIUrl":"https://doi.org/10.1155/2009/832413","url":null,"abstract":"The plasma screening effect is found to uncover a Cooper minimum in the photoionization cross sections from the ground state of the Li atom embedded in Debye plasma environment. The variation of the location of this minimum with Debye screening length is discussed and analyzed in terms of the instability of the ground state.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115806466","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: 15
Evaluation of the Thickness in Nanolayers Using the Transfer Matrix Method for Modeling the Spectral Reflectivity 用传递矩阵法模拟光谱反射率评价纳米层厚度
Research Letters in Physics Pub Date : 2009-04-23 DOI: 10.1155/2009/594175
J. E. González-Ramírez, J. Fuentes, L. Hernández, L. Hernandéz
{"title":"Evaluation of the Thickness in Nanolayers Using the Transfer Matrix Method for Modeling the Spectral Reflectivity","authors":"J. E. González-Ramírez, J. Fuentes, L. Hernández, L. Hernandéz","doi":"10.1155/2009/594175","DOIUrl":"https://doi.org/10.1155/2009/594175","url":null,"abstract":"The reflectivity spectra have been traditionally used to determine the thicknesses in semiconductor films. However, thicknesses of nanofilms are not easy to evaluate because the interference fringes are not visible in the transparent region. In this paper, we present a computed method based on the transfer matrix (TM) which is used to match the calculated and experimental room temperature reflectivity spectra of the ZnTe/GaAs films and to determine its thickness film values afterwards. The TM method needs only to know refraction indices and absorption coefficients as a function of wavelength for the film and the substrate. The thickness nanofilms evaluated by our method are in agreement with the values measured by ellipsometry, Rutherford backscattering spectroscopy and transmission electron microscopy techniques. The present procedure extends the application of the standard spectral reflectance technique to determine semiconductor nanolayer thicknesses.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132461429","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: 6
Observation of Suprathermal Flux from SROSS-C2 Data at Low Latitude 低纬地区SROSS-C2资料的超热通量观测
Research Letters in Physics Pub Date : 2009-02-15 DOI: 10.1155/2009/748104
R. S. Pandey, K. D. Misra
{"title":"Observation of Suprathermal Flux from SROSS-C2 Data at Low Latitude","authors":"R. S. Pandey, K. D. Misra","doi":"10.1155/2009/748104","DOIUrl":"https://doi.org/10.1155/2009/748104","url":null,"abstract":"The studies of suprathermal flux at equatorial latitude for low solar activity year of 1996 (from January to December) are reported. The retarding potential analyzer (RPA) data of Indian space research organization Stretched Rohini Satellite Series-C2 (SROSS-C2) are used. The suprathermal electron flux data are chosen in the height range of 4 7 5 ± 5 0  km. Seasional, latitudinal, and height variations of suprathermal flux having energy range above 30 eV along with comparisons in latitudinal variation of small energy superathermal flux of 5 eV are also reported. The data are selected during the period of local midnight to avoid contaminations from photoelectron flux and flux coming from coating of electrodes.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114151071","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
Effect of Sm Substitution on Structural, Dielectric, and Transport Properties of PZT Ceramics Sm取代对PZT陶瓷结构、介电和输运性能的影响
Research Letters in Physics Pub Date : 2009-01-28 DOI: 10.1155/2009/382578
R. Ranjan, R. Kumar, R. Choudhary
{"title":"Effect of Sm Substitution on Structural, Dielectric, and Transport Properties of PZT Ceramics","authors":"R. Ranjan, R. Kumar, R. Choudhary","doi":"10.1155/2009/382578","DOIUrl":"https://doi.org/10.1155/2009/382578","url":null,"abstract":"The polycrystalline samples of Pb1−𝑥Sm𝑥(Zr0.45Ti0.55)1−𝑥/4O3 (PSZT) (where 𝑥 = 0.00, 0.03, 0.06, and 0.09) were prepared by a high-temperature solid-state reaction technique. Preliminary X-ray structural analysis of the materials at room temperature has confirmed their formation in single-phase with tetragonal crystal structure. The temperature dependence of dielectric response of the samples at selected frequencies has exhibited their phase transition well above the room temperature. The variation of ac conductivity with temperature and the value of activation energy reveal that their conduction process is of mixed type (i.e., singly ionized in ferroelectric region and doubly ionized in paraelectric phase).","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123932092","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: 13
Evolving Networks with Enhanced Stability Properties 具有增强稳定性的进化网络
Research Letters in Physics Pub Date : 2008-11-30 DOI: 10.1155/2008/195873
D. Newth, Jeff Ash
{"title":"Evolving Networks with Enhanced Stability Properties","authors":"D. Newth, Jeff Ash","doi":"10.1155/2008/195873","DOIUrl":"https://doi.org/10.1155/2008/195873","url":null,"abstract":"We use a search algorithm to identify networks with enhanced linear \u0000stability properties in this account. We then analyze these networks for \u0000topological regularities that explain the source of their stability/instability. \u0000Analysis of the structure of networks with enhanced stability properties \u0000reveals that these networks are characterized by a highly skewed degree \u0000distribution, very short path-length between nodes, little or no clustering, \u0000and dissasortativity. By contrast, networks with enhanced instability \u0000properties have a peaked degree distribution with a small variance, long \u0000path-lengths between nodes, a high degree of clustering, and high assortativity. \u0000We then test the topological stability of these networks and discover \u0000that networks with enhanced stability properties are highly robust to the \u0000random removal of nodes, but highly fragile to targeted attacks, while networks \u0000with enhanced instability properties are robust to targeted attacks. \u0000These network features have implications for the physical and biological \u0000networks that surround us.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116240657","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
Comparison of the Solid Solution Properties of Mg-RE (Gd, Dy, Y) Alloys with Atomistic Simulation Mg-RE (Gd, Dy, Y)合金固溶性能的原子模拟比较
Research Letters in Physics Pub Date : 2008-11-16 DOI: 10.1155/2008/476812
Yurong Wu, Wangyu Hu
{"title":"Comparison of the Solid Solution Properties of Mg-RE (Gd, Dy, Y) Alloys with Atomistic Simulation","authors":"Yurong Wu, Wangyu Hu","doi":"10.1155/2008/476812","DOIUrl":"https://doi.org/10.1155/2008/476812","url":null,"abstract":"Molecular dynamic simulations have been performed to study the solid solution mechanism of Mg100-xREx (RE=Gd,Dy,Y, 𝑥=0.5,1,2,3,4at.%). The obtained results reveal that the additions of Gd, Dy and Y increase the lattice constants of Mg-RE alloys. Also the axis ratio c/a remains unchanged with increase in temperature, restraining the occurrence of nonbasal slip and twinning. Furthermore, it is confirmed that bulk modulus of Mg alloys can be increased remarkably by adding the Gd, Dy, Y, especially Gd, because the solid solubility of Gd in Mg decrease sharply with temperature in comparison with Dy and Y. Consequently, the addition of the RE can enhance the strength of Mg-based alloys, which is in agreement with the experimental results.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"2008 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129334281","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: 15
Ionic Conductivity and Phase Transition Behaviour in 4AgI-(1-)PbI2-2CuI System 4AgI-(1-)PbI2-2CuI体系的离子电导率和相变行为
Research Letters in Physics Pub Date : 2008-08-14 DOI: 10.1155/2008/249402
M. Hassan, R. Rafiuddin
{"title":"Ionic Conductivity and Phase Transition Behaviour in 4AgI-(1-)PbI2-2CuI System","authors":"M. Hassan, R. Rafiuddin","doi":"10.1155/2008/249402","DOIUrl":"https://doi.org/10.1155/2008/249402","url":null,"abstract":"Samples of general formula 4AgI-(1-𝑥)PbI2-2𝑥CuI, 𝑥=0-0.4, have been prepared and investigated by XRD, DSC, and temperature-dependent conductivity studies. X-ray diffractograms showed the presence of binary system consisting of AgI and PbI2 in the sample 𝑥=0. Cu-substituted samples showed very similar diffractograms to that of the pure compound which indicates that no effect for the substitution on the nature of the binary system. DSC curves showed the presence of phase transition whose temperature increased with Cu","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131587487","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: 8
Differential Gain in InGaAsN/GaAs Double Quantum Well Structures by Numerical Simulations InGaAsN/GaAs双量子阱结构的差分增益数值模拟
Research Letters in Physics Pub Date : 2008-07-03 DOI: 10.1155/2008/786939
M. Wartak, P. Weetman, P. Rusek
{"title":"Differential Gain in InGaAsN/GaAs Double Quantum Well Structures by Numerical Simulations","authors":"M. Wartak, P. Weetman, P. Rusek","doi":"10.1155/2008/786939","DOIUrl":"https://doi.org/10.1155/2008/786939","url":null,"abstract":"We performed numerical studies of differential gain in a coupled quantum well structures built from InGaAsN. Differential gain in In0.38Ga0.62As1_𝑦N𝑦/GaAs quantum well structures was determined and analyzed. A 10-band 𝑘_𝑝 Hamiltonian matrix was used in the calculations and solved self-consistently with Poisson's equation. The effect of Nitrogen composition and barrier thickness on differential gain has been determined. The influence of Nitrogen composition on differential gain is significant whereas barrier effects are modest.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121376649","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: 3
Kleinberg Navigation on Anisotropic Lattices 各向异性晶格上的Kleinberg导航
Research Letters in Physics Pub Date : 2008-05-06 DOI: 10.1155/2008/346543
J. Campuzano, James P. Bagrow, D. ben-Avraham
{"title":"Kleinberg Navigation on Anisotropic Lattices","authors":"J. Campuzano, James P. Bagrow, D. ben-Avraham","doi":"10.1155/2008/346543","DOIUrl":"https://doi.org/10.1155/2008/346543","url":null,"abstract":"We study the Kleinberg problem of navigation in small-world networks when the underlying lattice is stretched along a preferred direction. Extensive simulations confirm that maximally efficient navigation is attained when the length r of long-range links is taken from the distribution P(r)∼r−α, when the exponent α is equal to 2, the dimension of the underlying lattice, regardless of the amount of anisotropy, but only in the limit of infinite lattice size, L→∞. For finite size lattices we find an optimal α(L) that depends strongly on L. The convergence to α=2 as L→∞ shows interesting power-law dependence on the anisotropy strength.","PeriodicalId":341677,"journal":{"name":"Research Letters in Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131651437","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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