Physics & Astronomy International Journal最新文献_第2页

Propagation properties of dissipative waves in non Maxwellian plasmas 非麦克斯韦等离子体中耗散波的传播特性

Physics & Astronomy International Journal Pub Date : 2020-06-24 DOI: 10.15406/PAIJ.2020.04.00210

M. Mehdipoor

引用次数: 0

An algorithm for the detection of low frequency solar radio burst 一种低频太阳射电暴探测算法

Physics & Astronomy International Journal Pub Date : 2020-06-22 DOI: 10.15406/PAIJ.2020.04.00209

J. Kallunki

引用次数: 0

Calculation of singlet and triplet energy states of the two-dimensional (2D) H– ion and 2D He atom 二维氢离子和二维氦原子的单重态和三重态能态计算

Physics & Astronomy International Journal Pub Date : 2020-05-29 DOI: 10.15406/PAIJ.2020.04.00207

N. Kashirina

{"title":"Calculation of singlet and triplet energy states of the two-dimensional (2D) H– ion and 2D He atom","authors":"N. Kashirina","doi":"10.15406/PAIJ.2020.04.00207","DOIUrl":"https://doi.org/10.15406/PAIJ.2020.04.00207","url":null,"abstract":"Atoms and molecules with a reduced dimension can arise in large external magnetic fields. The magnetic traps were used by Görlitzet al1 in order to transfer sodium atoms to lower dimensional states. Transitions of sodium atoms in both two-dimensional (2D) and onedimensional (1D) state were realized. Super strong magnetic fields can occur in the plasma of the Sun and stars. Therefore, in principle, one can observe the spectra of two-dimensional atoms and molecules in them. As is well known, on the Sun and Sun-like stars, the atoms of hydrogen and Helium lead to a small absorption of light. The main absorption provides a negative hydrogenion.2 Metal atoms make a small contribution to absorption, since their number is tens of thousands of times smaller than those of hydrogen atoms. Such a negative ion is formed when a second electron is attached to a hydrogen atom. The numerical research of anisotropic characteristics of a two-dimensional (2D) hydrogen atom induced by a magnetic field was carried out for Koval et al.3 Under terrestrial conditions, Н– ions are unstable due to their extremely high chemical activity. A complete analog of the H– in semiconductor crystals is the D–center with a negative charge, i.e. a shallow hydrogen-like donor center that has captured an additional electron. The development of nanotechnologies has led to the emergence of new materials, such as two-dimensional monoatomic layers of various compositions. Graphene is a well-known example of a crystal with a two-dimensional hexagonal lattice in which one atom forms each vertex. There are other materials with a structure close to graphene.4,5 In such materials, it is possible to observe twodimensional analogues of D– centers in three-dimensional","PeriodicalId":137635,"journal":{"name":"Physics & Astronomy International Journal","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114639213","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

Oscillation symmetry applied to some astrophysical masses, and allowing to highlight remarkable relations between masses 振荡对称适用于一些天体物理质量，并允许突出质量之间的显著关系

Physics & Astronomy International Journal Pub Date : 2020-04-30 DOI: 10.15406/PAIJ.2020.04.00206

B. Tatischeff

引用次数: 8

The possible explaining of some controversial effects by a vortexial atom model 涡原子模型对一些有争议的效应的可能解释

Physics & Astronomy International Journal Pub Date : 2020-04-30 DOI: 10.15406/PAIJ.2020.04.00204

Marius Arghirescu

引用次数: 0

Design of single-mode optical fiber for low latency used in IoT optical transport networks 用于物联网光传输网络的低延迟单模光纤设计

Physics & Astronomy International Journal Pub Date : 2020-04-30 DOI: 10.15406/PAIJ.2020.04.00205

Faramarz E. Seraji, S. Safari, Ali Emami, Davood Ranjbar Raf

{"title":"Design of single-mode optical fiber for low latency used in IoT optical transport networks","authors":"Faramarz E. Seraji, S. Safari, Ali Emami, Davood Ranjbar Raf","doi":"10.15406/PAIJ.2020.04.00205","DOIUrl":"https://doi.org/10.15406/PAIJ.2020.04.00205","url":null,"abstract":"Optical Fiber as a transmission medium is now playing a major role in communication industry. A low latency is a vital element for any network design. Optical path optimization is the key to designing a network with low latency. Group delay coefficient is a fiber design variable used to optimize the propagation time. Dimensions, material composition and refractive-index profile, dispersion, and non-linearity of the fiber should be carefully selected to provide a satisfactory design for a given program. In this paper, several refractive index profiles are designed, using the OptiFiber software. Different refractive index profiles with triangular core, exponential core and ring, with exponential core and parabolic ring, and two-segmented core are considered to design SMFs for low latencies transmissions. Among other designed SMFs, two-segmented core fiber with core profile transformation is compared to the commercially available product, whose latency is improved by 0.73% with macro- and micro-bending losses of 3.29592e+2 dB/km and 0.0532336 dB/km, respectively, total dispersion of 16.7981 ps/nm.km, and mode field diameter (MFD) of 11.9422 µm at the wavelength of 1550 nm.","PeriodicalId":137635,"journal":{"name":"Physics & Astronomy International Journal","volume":"266 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121143268","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 intensity laser effects on environment 强激光对环境影响的研究

Physics & Astronomy International Journal Pub Date : 2020-04-30 DOI: 10.15406/PAIJ.2020.04.00203

A. Rezaei, Hamid Motavalibashi, M. Farasat

引用次数: 0

Transcription, torsional stress and the bending dynamics of DNA 转录，扭转应力和DNA的弯曲动力学

Physics & Astronomy International Journal Pub Date : 2020-02-17 DOI: 10.15406/PAIJ.2020.04.00200

Subhamoy Singha Roy

引用次数: 0

Potts model on directed complex networks 有向复杂网络上的Potts模型

Physics & Astronomy International Journal Pub Date : 2019-08-29 DOI: 10.15406/paij.2019.03.00175

F. Lima

引用次数: 1

Stellar matter distribution with scale-invariant hierarchical structuring 具有尺度不变层次结构的恒星物质分布

Physics & Astronomy International Journal Pub Date : 2019-07-11 DOI: 10.15406/PAIJ.2019.03.00173

H. Fahr

{"title":"Stellar matter distribution with scale-invariant hierarchical structuring","authors":"H. Fahr","doi":"10.15406/PAIJ.2019.03.00173","DOIUrl":"https://doi.org/10.15406/PAIJ.2019.03.00173","url":null,"abstract":"It is generally known that Einstein ́s general relativistic field equations (see Einstein,1915,1917, or later presented in books e.g. by Rindler, 1977, or Tolman, 1987)1,2 describe the 4-dim space time geometry through the gravitational geometry source, i.e. through the cosmic energy-momentum tensor Tik .Oppositely to what is commonly thought, this source tensor is not an easy-to-handle quantity, since the tensor ingredients are dependent on cosmic time in a non-trivial, but fairly complicated, and in a physically not evident or straightforward way. Even though all cosmological models start from the basis of the cosmological principle requiring that the universe at identical cosmic times looks the same from all space points in the universe, this does not make it evident what that means in terms of these Tik -tensor-ingredient data, even not in such a homogeneous and isotropic universe. In case the matter content of the universe can be described as a homogeneously distributed baryonic gas, then the mass density and the scalar pressure of this gas may count as spaceaveraged quantities, but in later, closer to the present phases of the universe, when matter is structured in stars, galaxies and galaxy clusters what in replace of these former quantities should be used then? In terms of gravity sources baryons imprisoned in the body of a star are not like the same number of baryons freely distributed as a cosmic baryon gas. Stellar baryons are much hotter and in the stellar interiors their pressure may strongly count in terms of Tik -ingredients. So the question arises how to make spatially averaged quantities out of them under such conditions.","PeriodicalId":137635,"journal":{"name":"Physics & Astronomy International Journal","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133108730","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