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Universal Journal of Physics and Application最新文献

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Strange Stars in the Color-Flavor Locked Phase 色-味锁相中的奇异恒星
Universal Journal of Physics and Application Pub Date : 2020-03-01 DOI: 10.13189/UJPA.2020.140101
M. Malaver, Prof Dr Hamed Daei Kasmaei
{"title":"Strange Stars in the Color-Flavor Locked Phase","authors":"M. Malaver, Prof Dr Hamed Daei Kasmaei","doi":"10.13189/UJPA.2020.140101","DOIUrl":"https://doi.org/10.13189/UJPA.2020.140101","url":null,"abstract":"We found new classes of exact models to the Einstein-Maxwell system of equations which describe the internal structure of a compact star made of strange matter considering the equation of state proposed by Rocha, Bernardo, de Avellar and Horvath in 2019. It has been assumed that this matter is composed of equal number of up, down and strange quarks and a small amount of electrons required to reaching the charge neutrality. If this hypothesis is correct, the neutron stars would be strange stars. We have chosen a particular form of gravitational potential Z(x) that depends on an adjustable parameter related to degree of anisotropy of the models and the new solutions can be written in terms of elementary and polynomial functions. The obtained models satisfy all physical features expected in a realistic star and the expressions for mass, density and stellar radius are comparable with the experimental results.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"80 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80067585","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
Spontaneous Emission by Three-level Atoms Pumped by Electron Bombardment 电子轰击泵浦下三能级原子的自发发射
Universal Journal of Physics and Application Pub Date : 2020-03-01 DOI: 10.13189/ujpa.2020.140102
M. Alemu
{"title":"Spontaneous Emission by Three-level Atoms Pumped by Electron Bombardment","authors":"M. Alemu","doi":"10.13189/ujpa.2020.140102","DOIUrl":"https://doi.org/10.13189/ujpa.2020.140102","url":null,"abstract":"In this paper we have studied the statistical and squeezing properties of the cavity light generated by a three-level laser. In this quantum optical system, N three-level atoms available in an open cavity, coupled to a two-mode vacuum reservoir, are pumped to the top level by means of electron bombardment at constant rate. We have considered the case in which the three-level atoms and the cavity modes interact with the two-mode vacuum reservoir. We have carried out our analysis by putting the noise operators associated with the vacuum reservoir in normal order. Applying the solutions of the equations of evolution for the expectation values of the atomic operators and the quantum Langevin equations for the cavity mode operators, we have calculated the mean and variance of the photon number as well as the quadrature squeezing for the cavity light. In addition, we have shown that the presence of the spontaneous emission process leads to a decrease in the mean and variance of the photon number. We have observed that the two-mode cavity light is in a squeezed state and the squeezing occurs in the minus quadrature. The maximum quadrature squeezing of the light generated by the laser, operating far below threshold, is found to be 50% below the vacuum-state level. We have also established that the mean photon number in the presence of spontaneous emission is less than the absence of spontaneous emission.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"11 1","pages":"11-22"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91168815","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
Monitoring of Neutrons Field of the WWR-SM Reactor at Reception of Phosphorus-33 WWR-SM反应堆接收磷-33时中子场监测
Universal Journal of Physics and Application Pub Date : 2019-10-01 DOI: 10.13189/UJPA.2019.130401
U. Ashrapov, D. Yusupov, M. Alieva, N. Rustamov
{"title":"Monitoring of Neutrons Field of the WWR-SM Reactor at Reception of Phosphorus-33","authors":"U. Ashrapov, D. Yusupov, M. Alieva, N. Rustamov","doi":"10.13189/UJPA.2019.130401","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130401","url":null,"abstract":"In the paper results of monitoring of thermal neutrons field in vertical irradiation channels of the WWR-SM nuclear research reactor of INP AS, Tashkent, Uzbekistan has been studied with purpose of determination of mode of irradiation target sulfur-33 (S-33) and increase specific activity of phosphorus-33 (Р-33). It is shown that reception P-33 with specific activity (120-140 mCi/g) is necessary to spend irradiation targets of S-33 elemental enrichment in vertical channels of the WWR-SM reactor in the following mode: irradiation place is distance of 35-50 cm below from top point of the vertical channel, nominal power of reactor=10MW, reactor thermal neutrons stream density ≥0.7⋅1014 neutrons/cm2.sec and irradiation time=320÷620 hours. Opportunity of application of S-33 as the monitor for reception of P-33 without the carrier was established. In fist time for express definition of specific activity of radionuclide P-33 in irradiation target S-33 the monitor S-33 was used","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83500448","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 Effects of Localized Trap Energy on the Photoluminescence Intensity of Gallium Nitrate (GaN) Compound Semiconductor for Different Radiative Trap Level 局域陷阱能量对不同辐射陷阱能级下硝酸镓(GaN)化合物半导体光致发光强度的影响
Universal Journal of Physics and Application Pub Date : 2019-10-01 DOI: 10.13189/UJPA.2019.130402
Getu Endale
{"title":"The Effects of Localized Trap Energy on the Photoluminescence Intensity of Gallium Nitrate (GaN) Compound Semiconductor for Different Radiative Trap Level","authors":"Getu Endale","doi":"10.13189/UJPA.2019.130402","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130402","url":null,"abstract":"In this paper, we model effects of localized trap energy on the photoluminescence at different radiative trap level. Wherever possible, the concepts are augmented with data, with particular emphasis in the case of Gallium nitrate. By using illumination and lifetime, the intensity of light in each band is determined by assuming one incident photon ejects one electron at a time. From this at different temperature, illumination, doping concentration and impurity densities of states the intensities of light vary for all radiative recombination mechanisms. By varying illumination and impurity densities of states at room temperature, the dominated radiative recombination mechanisms are studied from the three radiative recombination mechanisms. At high values of illumination, the intensity of light in band-to-band radiative recombination mechanism dominates for all values of localized trap energies. For high values of impurity trap density, only the intensity of light in conduction band to trap level radiative recombination mechanisms dominates for all localized trap energies.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84825651","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
Investigation of Electronic Structure, Mechanical, Magnetic Properties and Thermal Properties of Co2CrSi1-xAlx Quaternary Heusler Alloys: An Ab-initio Study Co2CrSi1-xAlx四元Heusler合金的电子结构、力学、磁性和热性能研究
Universal Journal of Physics and Application Pub Date : 2019-07-01 DOI: 10.13189/UJPA.2019.130301
I. Asfour, S. Ababou-Girard, D. Sébilleau
{"title":"Investigation of Electronic Structure, Mechanical, Magnetic Properties and Thermal Properties of Co2CrSi1-xAlx Quaternary Heusler Alloys: An Ab-initio Study","authors":"I. Asfour, S. Ababou-Girard, D. Sébilleau","doi":"10.13189/UJPA.2019.130301","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130301","url":null,"abstract":"The structural, electronic and elastic properties of full- Heusler alloys Co2CrZ (Z=Si,Al) and their quaternary compound Co2CrSi1-xAlx, are determined using the full potential linearized augmented plane waves (FP- LAPW) method based on (GGA) the Generalized Gradient Approximation and density functional theory (DFT) implemented in the WIEN2k package. As results, quaternary compound in CuHg2Ti-type crystal structure are stable. Density of states (DOS) and bands structure show the existence of energies band gaps in their minority-spin channels with half-metallic behavior. The lattice constant of new quaternary alloys Co2CrSi1-xAlx exhibits a small deviation from Vegard's law and a marginal deviation of the bulk modulus from linear concentration. The three independent elastic constants (C11, C12, and C44) are calculated from the direct computation of the stresses generated by small strains. Besides, we report the variation of the elastic constants as a function of pressure as well. From the calculated elastic constants, the mechanical character of Co2CrSi1-xAlx is predicted; elastic constants are calculated to investigate stability criteria and the mechanical nature of the studied materials. The quaternary compound is found to be mechanically anisotropic, ductile and meet the elastic stability criteria. A regular solution model is used to investigate the thermodynamic stability of the alloy which essentially shows a miscibility gap phase by calculating the critical temperatures of the alloys.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89176411","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
Time Dependence of Transient Radiative Excess Carrier Lifetimes and Carriers Density in Indium Antimonide(InSb) Semiconductor in the Presence and Absence of Illumination 有光照和无光照条件下锑化铟半导体中瞬态辐射过量载流子寿命和载流子密度的时间依赖性
Universal Journal of Physics and Application Pub Date : 2019-07-01 DOI: 10.13189/UJPA.2019.130302
Getu Endale
{"title":"Time Dependence of Transient Radiative Excess Carrier Lifetimes and Carriers Density in Indium Antimonide(InSb) Semiconductor in the Presence and Absence of Illumination","authors":"Getu Endale","doi":"10.13189/UJPA.2019.130302","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130302","url":null,"abstract":"In this work, we models the optical generation and transient radiative recombination excess carrier lifetimes in direct band gap semiconductors Indium antimonide (Insb) during illumination and after switching off the illumination. The time dependence of excess carrier density and excess carrier lifetimes are determined by using the doping level 1017cm-3 and absorption rate 1:21x1024cm-3s-1. The transient mean times for each excess carrier lifetimes to reach their steady-state values and excess carrier lifetime are determined.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"159 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74840981","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
Bogolyubov Gaussian Measure in Quantum Statistical Mechanics 量子统计力学中的Bogolyubov高斯测度
Universal Journal of Physics and Application Pub Date : 2019-03-01 DOI: 10.13189/UJPA.2019.130201
D. P. Sankovich
{"title":"Bogolyubov Gaussian Measure in Quantum Statistical Mechanics","authors":"D. P. Sankovich","doi":"10.13189/UJPA.2019.130201","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130201","url":null,"abstract":"The first steps in the application of methods for integrating functions defined on abstract sets were taken by Wiener. Most widely, the ideas of functional integration were developed in Feynman's works. The Feynman continual integral is well known to a wide community of physicists. Along with this, there is another approach to the construction of a functional integral in quantum physics. This approach was proposed by Bogolyubov. Bogolyubov's methods are relevant in quantum statistical physics, and have natural ties with probability theory. We review some mathematical results of integration with respect to a special Gaussian measure that arises in the statistical theory for quantum systems. It is shown that the Gibbs equilibrium averages of the chronological products of Bose operators can be represented as functional integrals with respect to this measure (the Bogolyubov measure). Some properties of this measure are studied. We rewrite partition function of many particle Bose systems in terms of Bogolyubov functional integral.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91359762","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
Paradigm of Light in Lucian Blaga's Outlook: A Semiotic Approach 卢西恩·布拉加《展望》中的光范式:符号学研究
Universal Journal of Physics and Application Pub Date : 2019-01-01 DOI: 10.13189/UJPA.2019.130101
C. Acăr
{"title":"Paradigm of Light in Lucian Blaga's Outlook: A Semiotic Approach","authors":"C. Acăr","doi":"10.13189/UJPA.2019.130101","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130101","url":null,"abstract":"","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85506933","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 Process of Formation of a Single Star System for Gravitational Compression of a Gas-dust Cloud in Outer Space 外太空气体尘埃云重力压缩下单星系统的形成过程
Universal Journal of Physics and Application Pub Date : 2019-01-01 DOI: 10.13189/UJPA.2019.130103
A. Belyaev
{"title":"The Process of Formation of a Single Star System for Gravitational Compression of a Gas-dust Cloud in Outer Space","authors":"A. Belyaev","doi":"10.13189/UJPA.2019.130103","DOIUrl":"https://doi.org/10.13189/UJPA.2019.130103","url":null,"abstract":"In this paper it is shown that in the process of formation of a single star system favorable conditions are created for the appearance of the planetary system due to the collision of the oppositely moving condensed dust zones from the newly born star and falling onto it from the periphery. A hypothetical version of the possible structure of the core of a single star born in a rarefied gas-dust cloud, explaining the cause of the mismatch of the axis of rotation of the star and the dipole magnetic field, is proposed. An assumption is made about the causes of the appearance of a directed orbital motion of planets that are not related to external perturbations of the initial gas-dust cloud.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74722169","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
Effects of Double Interfacial Layers on the Local Field Enhancement Factor and Optical Induced Bistability of a Small Spherical Metal/Dielectric Composites 双界面层对小球形金属/介质复合材料局部场增强因子和光致双稳性的影响
Universal Journal of Physics and Application Pub Date : 2019-01-01 DOI: 10.13189/ujpa.2019.130102
Berhanu Aragie
{"title":"Effects of Double Interfacial Layers on the Local Field Enhancement Factor and Optical Induced Bistability of a Small Spherical Metal/Dielectric Composites","authors":"Berhanu Aragie","doi":"10.13189/ujpa.2019.130102","DOIUrl":"https://doi.org/10.13189/ujpa.2019.130102","url":null,"abstract":"We propose the way of enhancing the enhancement factor of local field, and increasing the input domain threshold of the optical induced bistability of a spherical metal/dielectric composites within a linear host matrixes. The local field enhancement factor of a metal particles with dielectric core in the presence of double interfacial layers shows two maxima at two different frequencies. By introducing double interfacial layers, we calculate the enhancement factor of the local field. Also using the cubic equation the optical induced bistability of the composite material is calculated. Because of the double interfacial layers, we observe an increasing of the input domain threshold of the optical induced bistability. In comparison with the same composite without interfacial layer and with having single interfacial layer, our finding shows that, introducing additional interfacial layer makes the composite having a better enhancement factor and much better input domain threshold of the optical induced bistability.","PeriodicalId":23443,"journal":{"name":"Universal Journal of Physics and Application","volume":"175 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79766352","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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