发布求助
文献互助 智能选刊 最新文献

Bulgarian Journal of Physics最新文献

筛选
英文 中文
Ramanujan Sums-Wavelet Transform in the Context of ECG Signal Analysis Ramanujan和小波变换在心电信号分析中的应用
Bulgarian Journal of Physics Pub Date : 2022-07-10 DOI: 10.55318/bgjp.2022.49.3.266
{"title":"Ramanujan Sums-Wavelet Transform in the Context of ECG Signal Analysis","authors":"","doi":"10.55318/bgjp.2022.49.3.266","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.3.266","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128464118","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
Curvature Properties of Bardeen Black Hole Spacetime 巴丁黑洞时空的曲率特性
Bulgarian Journal of Physics Pub Date : 2022-06-08 DOI: 10.55318/bgjp.2023.50.2.168
A. Shaikh, S. Hui, Mousumi Sarkar
{"title":"Curvature Properties of Bardeen Black Hole Spacetime","authors":"A. Shaikh, S. Hui, Mousumi Sarkar","doi":"10.55318/bgjp.2023.50.2.168","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.2.168","url":null,"abstract":"The Bardeen solution corresponding to Einstein field equations with a cosmological constant is a regular black hole. The main goal of this manuscript is to investigate the geometric structures in terms of curvature conditions admitted by this spacetime. It is found that this spacetime is pseudosymmetric and possess several kinds of pseudosymmetries. Also, it is a manifold of pseudosymmetry Weyl curvature and the difference tensor C.R-R.C linearly depends on the tensors Q(g;C) and Q(S;C). It is interesting to note that such a spacetime is weakly generalized recurrent manifold and satisfies special recurrent like structure. Further, it is an Einstein manifold of level 2 and Roter type. The energy momentum tensor of this spacetime is pseudosymmetric and finally a worthy comparison between the geometric properties of Bardeen spacetime and Reissner-Nordstr\"om spacetime is given.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122571738","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
An Extension of the Explicit Calculation of the Principle of Least Action to a Power Series Potential 最小作用原理的显式计算推广到幂级数势
Bulgarian Journal of Physics Pub Date : 2022-04-02 DOI: 10.55318/bgjp.2022.49.2.163
{"title":"An Extension of the Explicit Calculation of the Principle of Least Action to a Power Series Potential","authors":"","doi":"10.55318/bgjp.2022.49.2.163","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.2.163","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127778484","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
An Attempt of Linking Maxwell with Newton to Study Electrodynamic Phenomena 把麦克斯韦和牛顿联系起来研究电动力学现象的尝试
Bulgarian Journal of Physics Pub Date : 2022-04-02 DOI: 10.55318/bgjp.2022.49.2.145
{"title":"An Attempt of Linking Maxwell with Newton to Study Electrodynamic Phenomena","authors":"","doi":"10.55318/bgjp.2022.49.2.145","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.2.145","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122318248","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
Thermoacoustical Analysis of Polymer Dextran at Different Frequencies Subhraraj Panda 高分子右旋糖酐在不同频率下的热声分析
Bulgarian Journal of Physics Pub Date : 2022-04-02 DOI: 10.55318/bgjp.2022.49.2.136
Subhraraj Panda
{"title":"Thermoacoustical Analysis of Polymer Dextran at Different Frequencies Subhraraj Panda","authors":"Subhraraj Panda","doi":"10.55318/bgjp.2022.49.2.136","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.2.136","url":null,"abstract":". In recent years, measurement of ultrasonic velocity is helpful to interpret solute-solute, solute-solvent interaction in aqueous medium. The ultrasonic speed ( U ), density ( ρ ) and viscosity ( η ) at 313 K have been determined using ultrasonic interferometer at four different frequencies i.e. 1, 5, 9 and 12 MHz, pycnometer and Ostwald’s viscometer of dextran in aqueous medium respectively. All the three measurements were carried out in a water bath of constant temperature with an uncertainty of pm 0 . 1 0 C. The derived acoustical parameters such as free volume ( V f ,), internal pressure ( π i ) , absorption coefficient ( α ) , molar sound velocity ( R ) and molar sound compressibility ( W ) have been determined from experimental data. The outcomes are described in terms of molecular interaction between the solution components.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123932793","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
The Study of Temperature Dependent Structural and Elastic Properties of Ni0.5Zn0.5Gd0.05Fe1.95O4 Ferrite Nanoparticles Ni0.5Zn0.5Gd0.05Fe1.95O4铁氧体纳米粒子温度相关结构和弹性性能研究
Bulgarian Journal of Physics Pub Date : 2022-04-02 DOI: 10.55318/bgjp.2022.49.2.174
K. Kumar, S. Bhavani, M. Shukur
{"title":"The Study of Temperature Dependent Structural and Elastic Properties of Ni0.5Zn0.5Gd0.05Fe1.95O4 Ferrite Nanoparticles","authors":"K. Kumar, S. Bhavani, M. Shukur","doi":"10.55318/bgjp.2022.49.2.174","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.2.174","url":null,"abstract":". The ferrite nanoparticles of composition Ni 0 . 5 Zn 0 . 5 Gd 0 . 05 Fe 1 . 95 O 4 were prepared by sol-gel method. In order to study the temperature dependent structural and elastic properties, the prepared powder was divided into five parts. The first part was considered as the as-prepared sample and the remaining four parts were calcinated at temperatures 600, 700, 800 and 900 ◦ C. The X-ray diffraction patterns confirmed the formation of cubic spinel structure in single phase and Fd3m space group without any impurity peaks. The crystallite size was found 17.61 nm in case of as-prepared sample whereas it was increased from 11.75 nm to 18.13 nm with the increment of calcination temperature from 600 to 900 ◦ C. The lattice parameter was found maximum, 8.389 Å in case of as-prepared sample whereas it was found decreased to 8.360 Å with the increment of calcination temperature. From the FE-SEM micrographs, the average grain size was found 100.2 nm in case of as-prepared sample whereas it was found increased to 152.3 nm with the increment of calcination temperature. The FTIR spectroscopy showed six absorption peaks in the range 350 to 3450 cm − 1 . The first two absorption bands were found in the ranges 360–448 cm − 1 and 553– 575 cm − 1 which attributes the presence of spinel structure. The study of elastic properties was made by measuring the longitudinal velocity ( V l ) and shear velocity ( V s ) which were carried out at room temperature using pulse transmission technique at the frequency of 1 MHz. The elastic moduli were found increased with the calcination temperature whereas zero porous moduli were found decreased with the calcination temperature.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"85 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126891193","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
Stability and Cosmic Acceleration of the Cosmological Models in Teleparallel Gravity 远平行重力下宇宙模型的稳定性和宇宙加速度
Bulgarian Journal of Physics Pub Date : 2022-04-02 DOI: 10.55318/bgjp.2022.49.2.190
A. Shaikh
{"title":"Stability and Cosmic Acceleration of the Cosmological Models in Teleparallel Gravity","authors":"A. Shaikh","doi":"10.55318/bgjp.2022.49.2.190","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.2.190","url":null,"abstract":"The paper is devoted to the study of LRS Bianchi type-I space–time filled in the presence of domain walls using volumetric power and exponential expansion laws towards the gravitational field equations of Teleparallel gravity. In power law model, the model is stable at the early phases of the universe and is unstable at late times while in exponential model, the model is stable. The geometrical and physical parameters for both the models are studied. In addition to make the interpretation more clear for that the statefinder diagnostic pair (r, s) and jerk parameter are analyzed to characterize different phases of the universe. The well-known astrophysical phenomena, namely the look-back time, proper distance, the luminosity distance and angular diameter distance with red shift are discussed.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123517748","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
Reflection Asymmetry in Ra Isotopes Ra同位素的反射不对称性
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.078
E. V. Mardyban
{"title":"Reflection Asymmetry in Ra Isotopes","authors":"E. V. Mardyban","doi":"10.55318/bgjp.2022.49.1.078","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.078","url":null,"abstract":"We developed a model which allows to take into account both shape deformation parameters and cluster degrees of freedom. The important ingredient of the model is the dinuclear system concept in which the wave function of the nucleus is treated as a superposition of a mononucleus and two-cluster configurations. The model is applied to describe the properties of alternating rotational bands in Ra. The spin-dependences of the parity splitting and of the reduced matrix elements of E1 transitions between the members of alternating parity bands are calculated and compared with experimental data.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128610450","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
Ab initio View of Emergent Symplectic Symmetry and Its Crutial Role in Nuclear Dynamics 涌现辛对称的从头认识及其在核动力学中的关键作用
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.037
T. Dytrych
{"title":"Ab initio View of Emergent Symplectic Symmetry and Its Crutial Role in Nuclear Dynamics","authors":"T. Dytrych","doi":"10.55318/bgjp.2022.49.1.037","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.037","url":null,"abstract":"Results of large-scale first principle nuclear structure studies using the symmetry-adapted no-core shell model are reported. It is shown that nuclei up through the intermediate-mass region display highly regular and ubiquitous patterns of dominant nuclear shapes that vibrate and rotate. This emergent structure is tied to an approximate symplectic Sp(3,R) symmetry, and it is shown to determine dominant features of low-lying states, even in close-to-spherical nuclear states without any recognizable rotational properties.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131009798","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
N = 90 Shape Phase Transition: Increasing Axial Asymmetry Towards 148Ce N = 90形状相变:向148Ce方向增加轴向不对称性
Bulgarian Journal of Physics Pub Date : 2022-02-11 DOI: 10.55318/bgjp.2022.49.1.089
P. Koseoglou
{"title":"N = 90 Shape Phase Transition: Increasing Axial Asymmetry Towards 148Ce","authors":"P. Koseoglou","doi":"10.55318/bgjp.2022.49.1.089","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.1.089","url":null,"abstract":"In this proceedings the increasing axial asymmetry in the N = 90 isotopes with decreasing atomic number from Sm to Ce is shown. The placement of the nuclei of interest into the Interacting Boson Model symmetry triangle and the calculations of the approximate effective γ deformation shows the existence of some axial asymmetry, γ eff ≈ 10◦, in Ce, while the N = 90 Sm does not show any. Moreover, the shape evolution study of the cerium, neodymium and samarium chains shows the over all increasing axially asymmetry with decreasing atomic number.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124484002","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书