Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.911
Adriana Radu, I. Grigore, Cristina Miron, V. Barna
{"title":"Excel spreadsheets for the study of Lissajous figures","authors":"Adriana Radu, I. Grigore, Cristina Miron, V. Barna","doi":"10.59277/romrepphys.2023.75.911","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.911","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"95 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.912
Anda Ciobanu, Cristina Miron, C. Berlic, V. Barna
{"title":"Integrating computational tools in teaching electromagnetic oscillations","authors":"Anda Ciobanu, Cristina Miron, C. Berlic, V. Barna","doi":"10.59277/romrepphys.2023.75.912","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.912","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"80 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.706
Claudia Stihi, O. Bute
{"title":"Indoor air quality monitoring in educational environments: a case study","authors":"Claudia Stihi, O. Bute","doi":"10.59277/romrepphys.2023.75.706","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.706","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"302 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138996719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.121
Weaam Alhejaili, A. Wazwaz, S. El-Tantawy
{"title":"Lump and multiple soliton solutions to the new integrable (3+1)-dimensional Boussinesq equation","authors":"Weaam Alhejaili, A. Wazwaz, S. El-Tantawy","doi":"10.59277/romrepphys.2023.75.121","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.121","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"76 2","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.120
H. OULD SIDI, M. Zaky, K. EL WALED, A. Akgul, A. Hendy
{"title":"Numerical reconstruction of a space-dependent source term for multidimensional space-time fractional diffusion equations","authors":"H. OULD SIDI, M. Zaky, K. EL WALED, A. Akgul, A. Hendy","doi":"10.59277/romrepphys.2023.75.120","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.120","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"93 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.707
A. Volvach, L. Kogan, L. Volvach, K. Kanonidi, I. Bubukin, E. Revunova
. The article investigates the properties of small-scale probability density fluctuations for measurements of X , Y and Z -components of the Earth's magnetic field before the earthquake that took place in November 2022 in the southern European region. A comparison is made of the properties of the statistical functional corresponding to the measurements of the magnetic field for three spatially separated magnetovariational stations located at different geographical azimuths with respect to the point of the epicenter of the indicated event. It is shown that for all stations there is a significant topological similarity of the dependences corresponding to the specified functional, considered as a function of time.
.文章研究了 2022 年 11 月南欧地区地震前地球磁场 X、Y 和 Z 分量测量值的小尺度概率密度波动特性。我们比较了三个空间上分离的磁变站的磁场测量结果所对应的统计函数的性质，这三个磁变站相对于所述事件的震中点位于不同的地理方位角。结果表明，对于所有观测站而言，与特定函数相对应的依赖关系在拓扑上具有显著的相似性，被视为时间的函数。
{"title":"On the topological similarity of the functionals from the statistics of magnetic field measurements before the earthquake on November 3, 2022, in the Gura Teghii, Romania region","authors":"A. Volvach, L. Kogan, L. Volvach, K. Kanonidi, I. Bubukin, E. Revunova","doi":"10.59277/romrepphys.2023.75.707","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.707","url":null,"abstract":". The article investigates the properties of small-scale probability density fluctuations for measurements of X , Y and Z -components of the Earth's magnetic field before the earthquake that took place in November 2022 in the southern European region. A comparison is made of the properties of the statistical functional corresponding to the measurements of the magnetic field for three spatially separated magnetovariational stations located at different geographical azimuths with respect to the point of the epicenter of the indicated event. It is shown that for all stations there is a significant topological similarity of the dependences corresponding to the specified functional, considered as a function of time.","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-15DOI: 10.59277/romrepphys.2023.75.117
S. Popescu, G. Popa
{"title":"Ştefan Procopiu − Pioneer of Plasma Physics in Romania","authors":"S. Popescu, G. Popa","doi":"10.59277/romrepphys.2023.75.117","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.117","url":null,"abstract":"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"92 6","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-15DOI: 10.59277/romrepphys.2023.75.605
AUREL I. POPESCU, CLAUDIA G. CHILOM
" The manifestation of life, in all its aspects, is the result of an enormous number of specific biophysical and biochemical molecular interactions taking place ceaselessly into cells, in a highly ordered manner both spatially and temporally. Frequently, a product of any reaction, is not a final compound, but the initial reactant of another reaction taking place in a precise location and at right time into the intricate cellular reactions network. In this minireview, we will present, in an accessible manner, the nature and paramount importance of the specific interactions which constitute the essential basis for all life processes on the Earth"
{"title":"Teaching biophysics I. The specific interactions: the sine qua non processes of life","authors":"AUREL I. POPESCU, CLAUDIA G. CHILOM","doi":"10.59277/romrepphys.2023.75.605","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.605","url":null,"abstract":"\" The manifestation of life, in all its aspects, is the result of an enormous number of specific biophysical and biochemical molecular interactions taking place ceaselessly into cells, in a highly ordered manner both spatially and temporally. Frequently, a product of any reaction, is not a final compound, but the initial reactant of another reaction taking place in a precise location and at right time into the intricate cellular reactions network. In this minireview, we will present, in an accessible manner, the nature and paramount importance of the specific interactions which constitute the essential basis for all life processes on the Earth\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135486605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-15DOI: 10.59277/romrepphys.2023.75.115
MA WEN-XIU
"We aim to construct a Liouville integrable Hamiltonian hierarchy from a specific matrix spectral problem with four potentials through the zero curvature formulation. The Liouville integrability of the resulting hierarchy is exhibited by a bi-Hamiltonian structure explored by using the trace identity. Illustrative examples of novel four-component coupled Liouville integrable nonlinear Schr¨odinger equations and modified Korteweg-de Vries equations are presented."
{"title":"A Liouville integrable hierarchy with four potentials and its bi-Hamiltonian structure","authors":"MA WEN-XIU","doi":"10.59277/romrepphys.2023.75.115","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.115","url":null,"abstract":"\"We aim to construct a Liouville integrable Hamiltonian hierarchy from a specific matrix spectral problem with four potentials through the zero curvature formulation. The Liouville integrability of the resulting hierarchy is exhibited by a bi-Hamiltonian structure explored by using the trace identity. Illustrative examples of novel four-component coupled Liouville integrable nonlinear Schr¨odinger equations and modified Korteweg-de Vries equations are presented.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135353683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-15DOI: 10.59277/romrepphys.2023.75.908
VITALIE CHISTOL, DUMITRU CIOCHINA, VASILE TRONCIU
"We report examples of obtaining the bistability effect in mechanics and the experimental demonstration of this effect. We propose to use the graphical method of solving physics problems. The method explains qualitatively the theoretical results. We investigate the influence of different parameters on bistability properties. Finally, the experiment shows a clear evidence of bistability in a mechanical system"
{"title":"Bistability effects in mechanics and its experimental demonstration","authors":"VITALIE CHISTOL, DUMITRU CIOCHINA, VASILE TRONCIU","doi":"10.59277/romrepphys.2023.75.908","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.908","url":null,"abstract":"\"We report examples of obtaining the bistability effect in mechanics and the experimental demonstration of this effect. We propose to use the graphical method of solving physics problems. The method explains qualitatively the theoretical results. We investigate the influence of different parameters on bistability properties. Finally, the experiment shows a clear evidence of bistability in a mechanical system\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135486602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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