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Facta Universitatis - Series: Physics, Chemistry and Technology最新文献

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Peculiar five-dimensional black holes 奇特的五维黑洞
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1901069s
Dejan B. Simic
{"title":"Peculiar five-dimensional black holes","authors":"Dejan B. Simic","doi":"10.2298/fupct1901069s","DOIUrl":"https://doi.org/10.2298/fupct1901069s","url":null,"abstract":"In this article, we review two black hole solutions to the five-dimensional Lovelock gravity. These solutions are characterized by the non-vanishing torsion and the peculiar property that all their conserved charges vanish. The first solution is a spherically symmetric black hole with torsion, which also has zero entropy in the semiclassical approximation. The second solution is a black ring, which is the five-dimensional uplift of the BTZ black hole with torsion in three dimensions.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77599993","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
Measurement of radon concentration in kindergartens and schools in Nis, Serbia 塞尔维亚尼什幼儿园和学校氡浓度的测量
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1902191m
V. Manić, G. Manic, B. Radojković, D. Vucic, D. Nikezic, D. Krstić
{"title":"Measurement of radon concentration in kindergartens and schools in Nis, Serbia","authors":"V. Manić, G. Manic, B. Radojković, D. Vucic, D. Nikezic, D. Krstić","doi":"10.2298/fupct1902191m","DOIUrl":"https://doi.org/10.2298/fupct1902191m","url":null,"abstract":"In this study, the activity concentration of radon, 222Rn, in kindergartens and schools in the town of Nis, Serbia, was explored. The method of active charcoal was applied. The measurements were carried out by gamma - spectrometry with HPGe detector. The results belong to the range of 15 Bq/m3 - 256 Bq/m3, with an average value of 59.7 Bq/m3 and a standard deviation of 25.3 Bq/m3. It was shown that data are distributed according to the log-normal distribution, and that is no correlation between indoor 222Rn concentrations and the activity concentrations of radium, 226Ra, in the soil.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83598374","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 Higgs di-photon decay in the standard model effective field theory 标准模型有效场论中的希格斯双光子衰变
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1901089t
L. Trifyllis
{"title":"The Higgs di-photon decay in the standard model effective field theory","authors":"L. Trifyllis","doi":"10.2298/fupct1901089t","DOIUrl":"https://doi.org/10.2298/fupct1901089t","url":null,"abstract":"Starting from the Standard Model (SM) of elementary particle physics, we assume that new physics effects can be encoded in higher-dimensional operators added in the SM Lagrangian. The resulting theory, the SM Effective Field Theory (SMEFT), is then used for high-accuracy phenomenological studies. Through this paper, the di-photon decay of the Higgs boson is used as a sample of a concrete calculation in the SMEFT framework.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79210788","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 motion of charged particles in non-standard tokamak magnetic field 非标准托卡马克磁场中带电粒子的运动
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1901063n
M. Negrea, I. Petrisor, D. Constantinescu
{"title":"On the motion of charged particles in non-standard tokamak magnetic field","authors":"M. Negrea, I. Petrisor, D. Constantinescu","doi":"10.2298/fupct1901063n","DOIUrl":"https://doi.org/10.2298/fupct1901063n","url":null,"abstract":"In this paper we analyze the motion of charged particles in a non-standard magnetic field that is of a Clebsch type representation where a magnetic perturbation is considered. The safety factor of ASDEX-Upgrade is used. Some aspects of the solutions of the guiding center system of equations are featured.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78727733","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
Electromagnetically induced transparency in a rectangular quantum dot on a single electron 单电子上矩形量子点的电磁感应透明
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1902131p
V. Pavlovic, Z. Lazić, Ljiljana Stevanović, N. Filipović
{"title":"Electromagnetically induced transparency in a rectangular quantum dot on a single electron","authors":"V. Pavlovic, Z. Lazić, Ljiljana Stevanović, N. Filipović","doi":"10.2298/fupct1902131p","DOIUrl":"https://doi.org/10.2298/fupct1902131p","url":null,"abstract":"In this paper, we investigated the realization of electromagnetically induced transparency (EIT) in a rectangular quantum dot (QD) with a single electron in the presence of probe and control laser fields. The lowest three levels of the confined electron that form ladder and V configuration were chosen. We discussed the dependence of density matrix elements for ladder configuration and for V configuration on detunings of the probe field for various values of quantum dot dimensions. This dependence is discussed for both cases, at cryogenic temperatures when spontaneous emission dominates the relaxation mechanism and at room or higher temperatures when dephasing rate cannot be neglected.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88057172","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
Scalar quasinormal modes of the near extremal Reissner-Nordström black hole in NC space-time NC时空中近极值Reissner-Nordström黑洞的标量拟正态
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1901043d
Marija Dimitrijevic-Ciric, N. Konjik, A. Samsarov
{"title":"Scalar quasinormal modes of the near extremal Reissner-Nordström black hole in NC space-time","authors":"Marija Dimitrijevic-Ciric, N. Konjik, A. Samsarov","doi":"10.2298/fupct1901043d","DOIUrl":"https://doi.org/10.2298/fupct1901043d","url":null,"abstract":"A way to search for a signal of space-time noncommutativity is to study a quasinormal mode spectrum of the Reissner-Nordstr?m black hole in the presence of noncommutativity. In this paper, we chose a particular NC deformation defined by the angular twist. We investigate a noncommutative (NC) deformation of a complex scalar field, minimally coupled with a classical (commutative) near extremal Reissner-Nordstr?m background. The theory is manifestly invariant under the deformed U(1)* gauge symmetry group. Using the EOM for the NC complex scalar field in RN background, the QNM spectrum is calculated for a particular range of parameters coresponding to the near extremal limit.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77089851","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
Maxwell’s demon and interactionism 麦克斯韦妖和互动论
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2019-01-01 DOI: 10.2298/fupct1902161d
R. Dimitrijević
{"title":"Maxwell’s demon and interactionism","authors":"R. Dimitrijević","doi":"10.2298/fupct1902161d","DOIUrl":"https://doi.org/10.2298/fupct1902161d","url":null,"abstract":"Maxwell's demon is an imaginary being invented a century and a half ago by James Clarke Maxwell in order to illustrate the statistical nature of the Second Law of thermodynamics. It helped us reach a better understanding not only of that law but also of the relationship between statistical physics and thermodynamics. Since the 1910?s it has caused a flood of papers of scientists who have tried to save the Second Law from the threat of the demon and hence preclude the possibility of perpetuum mobile of the second kind. Nowadays, it helps us better understand the possibility of constructing an interactionist model of mental causation manifested through the violation of the Second Law by the mind.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89866758","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
Cosmological flows on hyperbolic surfaces 双曲表面上的宇宙学流
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2018-09-30 DOI: 10.2298/FUPCT1901001B
E. Babalic, C. Lazaroiu
{"title":"Cosmological flows on hyperbolic surfaces","authors":"E. Babalic, C. Lazaroiu","doi":"10.2298/FUPCT1901001B","DOIUrl":"https://doi.org/10.2298/FUPCT1901001B","url":null,"abstract":"We outline the geometric formulation of cosmological flows for FLRW models\u0000 with the scalar matter as well as certain aspects which arise in their study\u0000 with methods originating from the geometric theory of dynamical systems. We\u0000 briefly summarize certain results of numerical analysis which we carried out\u0000 when the scalar manifold of the model is a hyperbolic surface of the finite\u0000 or infinite area.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90358874","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
DEGRADATION OF REACTIVE ORANGE 16 USING A PROTOTYPE ATMOSPHERIC-PRESSURE NON-THERMAL PLASMA REACTOR 使用原型常压非热等离子体反应器降解活性橙16
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2018-01-01 DOI: 10.2298/FUPCT1803285R
S. Rančev, M. Petrović, A. Bojić, D. Radivojevic, C. Maluckov, M. Radović
{"title":"DEGRADATION OF REACTIVE ORANGE 16 USING A PROTOTYPE ATMOSPHERIC-PRESSURE NON-THERMAL PLASMA REACTOR","authors":"S. Rančev, M. Petrović, A. Bojić, D. Radivojevic, C. Maluckov, M. Radović","doi":"10.2298/FUPCT1803285R","DOIUrl":"https://doi.org/10.2298/FUPCT1803285R","url":null,"abstract":"A prototype atmospheric pressure non-thermal corona plasma reactor system is developed and tested for the removal of commercial textile reactive dye from water. The dye can be completely degraded in water by the presented reactor system in the initial concentration range of 10-100 mg dm -3 . Dye degradation rate decreases with the increase of initial dye concentration and pulse frequency. The pH of treated solutions decreases with the increase of treatment time and with the decrease of the applied frequency. Solutions electrical conductivity increases with an increase of treatment time and with the decrease of the applied frequency. The decolorization reactions follow the pseudo-first kinetics order. The changes in the treated dye solutions compositions are the consequences of injection of plasma generated reactive species from gas into the liquid through the interfacial zone. HIGHLIGHTS Atmospheric pressure non-thermal plasma reactor is developed for organics degradation use Textile reactive dye was completely decolorized in the tested initial dye concentration range Degradation rate decreases with the increase of initial concentration and applied reactor frequency Degradation kinetics follows the pseudo-first-order model The increase of reaction time and applied frequency cause the decrease of pH and increase of electrical conductivity","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"74 1","pages":"285-295"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74184926","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 CONNECTION BETWEEN MATHEMATICS AND PHYSICS FROM THE ASPECT OF REASONING BASED ON PROPORTIONS AND ERRORS IN THE CONCLUSION 数学和物理之间的联系从基于比例和错误结论的推理方面
Facta Universitatis - Series: Physics, Chemistry and Technology Pub Date : 2018-01-01 DOI: 10.2298/FUPCT1803257R
B. Radulović, Marina Dorocki
{"title":"THE CONNECTION BETWEEN MATHEMATICS AND PHYSICS FROM THE ASPECT OF REASONING BASED ON PROPORTIONS AND ERRORS IN THE CONCLUSION","authors":"B. Radulović, Marina Dorocki","doi":"10.2298/FUPCT1803257R","DOIUrl":"https://doi.org/10.2298/FUPCT1803257R","url":null,"abstract":"Numerous researchers emphasized the connection between mathematics and physics, as well as the pupil's lack of linking knowledge gained within these subjects. In this paper, examples of the connection between mathematics and physics will be examined by the scientific reasoning test and the initial test created for this research. In the research related to the initial knowledge and scientific research, 235 students of the first and second grade of gymnasiums in Novi Sad and Backa Palanka participated. The results of the research have shown that most of the students did not correctly answer questions related to reasoning based on proportions. The obtained result points to the pupil's misunderstanding of the notion of the smallest interval of an instrument, that is, the value of an instrumental error, which is the basis of the correct reading of the experimental results in the teaching of physics. From the point of view of physics, it is important for pupils to point out the mistakes they have made in concluding, in order to correct their claims and the exact information associated with existing ones in long-term memory.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"16 1","pages":"257-265"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73988583","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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