Pub Date : 2023-12-15DOI: 10.59277/romjphys.2023.68.912
D. Pietreanu, M. Vasile
"Application Specific Integrated Circuits (ASICs) have been, for a long time, the best, and sometimes only, option when there was a need for high performance electronics while operating with tight constraints regarding communication bandwidth, speed and/or latency, low power consumption and other, more specialized requirements, such as radiation hardness. To make sure that all ASICs that are going to be used in electronics parts installed on experimental physics detectors are working properly, they need to be thoroughly tested and their testing results need to be stored and used for manufacturing traceability purposes. A test bench solution which allows identifying and eliminating sources of errors during the integration of ASICs in detector electronics based on machine vision and test automation procedures has been designed for this purpose and is being presented."
{"title":"Test Bench Solution for ASIC Inspection","authors":"D. Pietreanu, M. Vasile","doi":"10.59277/romjphys.2023.68.912","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.912","url":null,"abstract":"\"Application Specific Integrated Circuits (ASICs) have been, for a long time, the best, and sometimes only, option when there was a need for high performance electronics while operating with tight constraints regarding communication bandwidth, speed and/or latency, low power consumption and other, more specialized requirements, such as radiation hardness. To make sure that all ASICs that are going to be used in electronics parts installed on experimental physics detectors are working properly, they need to be thoroughly tested and their testing results need to be stored and used for manufacturing traceability purposes. A test bench solution which allows identifying and eliminating sources of errors during the integration of ASICs in detector electronics based on machine vision and test automation procedures has been designed for this purpose and is being presented.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"97 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000401","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/romjphys.2023.68.207
Khoa Anh Tran Tran, K. B. Dinh, Thong Huy Chau, Sachin Chintalwad, V. K. Truong, Hoi Ba Nguyen, Hung Tan Nguyen, T. Ho, L. Dao
"In this study, we experimentally investigate the variation of the phase matching condition of the high harmonic generation (HHG) process with pure argon gas and an argon-neon gas mixture. Phase-matched HHG is generated around the absorption edge of argon gas and then neon gas is added to the original argon gas. The pressure-dependent intensity of the harmonics produced by pure argon gas and the gas mixture is examined. We show that as more neon gas is added to the mixture, the phase matching of the higher order harmonics is less favourable than that of the lower order harmonics. Finally, the total phase mismatch at various gas mixture pressures is discussed. Our experimental results are in agreement with the theoretical calculation."
{"title":"Investigation of High Harmonic Generation in Ar-Ne Gas Mixture","authors":"Khoa Anh Tran Tran, K. B. Dinh, Thong Huy Chau, Sachin Chintalwad, V. K. Truong, Hoi Ba Nguyen, Hung Tan Nguyen, T. Ho, L. Dao","doi":"10.59277/romjphys.2023.68.207","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.207","url":null,"abstract":"\"In this study, we experimentally investigate the variation of the phase matching condition of the high harmonic generation (HHG) process with pure argon gas and an argon-neon gas mixture. Phase-matched HHG is generated around the absorption edge of argon gas and then neon gas is added to the original argon gas. The pressure-dependent intensity of the harmonics produced by pure argon gas and the gas mixture is examined. We show that as more neon gas is added to the mixture, the phase matching of the higher order harmonics is less favourable than that of the lower order harmonics. Finally, the total phase mismatch at various gas mixture pressures is discussed. Our experimental results are in agreement with the theoretical calculation.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"78 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138996166","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/romjphys.2023.68.619
H. Saadi, E. M. Jalal, O. Elgarraoui, A. El Antari, M. Madani
"The magnetic properties and phase diagrams of a hexagonal nanotube with core-shell structure have been examined within the framework of the mean field theory based on the Bogoliubov inequality as well as the Monte Carlo simulation via the Metropolis algorithm. We have studied in detail the influences of the different ex- change couplings and the crystal field on the phase diagrams of the system. This study allowed us to discover the existence of interesting critical phenomena, in particular the compensation behavior. Moreover, we have investigated the behavior of the magne- tizations corresponding to each of the phase diagrams in order to verify the obtained results."
{"title":"Magnetic Properties of a Mixed Spin-1/2 and Spin-7/2 Hexagonal Core-Shell Nanotube","authors":"H. Saadi, E. M. Jalal, O. Elgarraoui, A. El Antari, M. Madani","doi":"10.59277/romjphys.2023.68.619","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.619","url":null,"abstract":"\"The magnetic properties and phase diagrams of a hexagonal nanotube with core-shell structure have been examined within the framework of the mean field theory based on the Bogoliubov inequality as well as the Monte Carlo simulation via the Metropolis algorithm. We have studied in detail the influences of the different ex- change couplings and the crystal field on the phase diagrams of the system. This study allowed us to discover the existence of interesting critical phenomena, in particular the compensation behavior. Moreover, we have investigated the behavior of the magne- tizations corresponding to each of the phase diagrams in order to verify the obtained results.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"2 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000204","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/romjphys.2023.68.116
Wen-Xiu Ma
"The aim of this paper is to generate a kind of integrable hierarchies of four-component evolution equations with Hamiltonian structures, from a kind of reduced Ablowitz-Kaup-Newell-Segur (AKNS) matrix spectral problems. The zero curvature formulation is the basic tool and the trace identity is the key to establishing Hamiltonian structures. Two examples of Hamiltonian equations in the resulting inte- grable hierarchies are added to the category of coupled integrable nonlinear Schr¨odinger equations and coupled integable modified Korteweg-de Vries equations."
{"title":"AKNS Type Reduced Integrable Hierarchies with Hamiltonian Formulations","authors":"Wen-Xiu Ma","doi":"10.59277/romjphys.2023.68.116","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.116","url":null,"abstract":"\"The aim of this paper is to generate a kind of integrable hierarchies of four-component evolution equations with Hamiltonian structures, from a kind of reduced Ablowitz-Kaup-Newell-Segur (AKNS) matrix spectral problems. The zero curvature formulation is the basic tool and the trace identity is the key to establishing Hamiltonian structures. Two examples of Hamiltonian equations in the resulting inte- grable hierarchies are added to the category of coupled integrable nonlinear Schr¨odinger equations and coupled integable modified Korteweg-de Vries equations.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"141 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998264","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/romjphys.2023.68.303
M. Majumder, U. Laha
"Considering the Hulth´en potential as the nuclear part of interaction regular solution is derived by exploiting the Frobenius method. The Jost function is constructed by utilizing its integral representation in terms of regular solution. The scattering phase shifts and cross-sections are calculated for the n−3He system from the on-shell Jost function. The results obtained are in close conformity with the previous works that exist in the literature."
{"title":"Low Energy Analysis of Phase Shifts and Cross-Section for n – 3He System","authors":"M. Majumder, U. Laha","doi":"10.59277/romjphys.2023.68.303","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.303","url":null,"abstract":"\"Considering the Hulth´en potential as the nuclear part of interaction regular solution is derived by exploiting the Frobenius method. The Jost function is constructed by utilizing its integral representation in terms of regular solution. The scattering phase shifts and cross-sections are calculated for the n−3He system from the on-shell Jost function. The results obtained are in close conformity with the previous works that exist in the literature.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"45 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995740","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/romjphys.2023.68.115
S. Nikolić, N. Aleksić, Wieslav Krolikowski, M. Belić, Nail Akhmediev
"We show that linear stability analysis not only describes the effect of modulation instability of a plane wave in nonlinear media but it also predicts significant wave amplification outside of the standard instability band. As an example, we consider the classic MI in the case of the nonlinear Schr¨odinger equation. However, similar amplification may take place in many other nonlinear media that admit modulation instability."
{"title":"Wave Amplification Outside of the Modulation Instability Band","authors":"S. Nikolić, N. Aleksić, Wieslav Krolikowski, M. Belić, Nail Akhmediev","doi":"10.59277/romjphys.2023.68.115","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.115","url":null,"abstract":"\"We show that linear stability analysis not only describes the effect of modulation instability of a plane wave in nonlinear media but it also predicts significant wave amplification outside of the standard instability band. As an example, we consider the classic MI in the case of the nonlinear Schr¨odinger equation. However, similar amplification may take place in many other nonlinear media that admit modulation instability.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"70 12","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998883","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/romjphys.2023.68.620
N. Ćelić, Goran Štrbac, Imre Gut, Nenad Tadić, Ondrej Bosak, Svetlana LUKIĆ-PETROVIĆ
"UV radiation can have a harmful effect on both humans and the environment. Therefore, developing UV shielding materials is an important step in protecting ourselves and the environment from the harmful effects of UV radiation. Here we present a detailed study of ZnO-SnO2/PMMA nanocomposite coatings, which completely block UVC radiation. Additionally, we study the effect of the addition of ZnO-SnO2 nanoparticles on mechanical properties in the means of Vickers microhardness and find out that they positively affect the microhardness of the PMMA coatings up to a certain concentration. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) reveal quite homogeneous distribution of nanoparticles for lower concentrations and the presence of nanoparticle aggregates for higher concentrations such as 1 wt.% and 5 wt.% of ZnO-SnO2 nanoparticles."
{"title":"Highly Transparent ZnO-SnO2/PMMA UVC Shielding Coatings with Exceptional Mechanical Stability","authors":"N. Ćelić, Goran Štrbac, Imre Gut, Nenad Tadić, Ondrej Bosak, Svetlana LUKIĆ-PETROVIĆ","doi":"10.59277/romjphys.2023.68.620","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.620","url":null,"abstract":"\"UV radiation can have a harmful effect on both humans and the environment. Therefore, developing UV shielding materials is an important step in protecting ourselves and the environment from the harmful effects of UV radiation. Here we present a detailed study of ZnO-SnO2/PMMA nanocomposite coatings, which completely block UVC radiation. Additionally, we study the effect of the addition of ZnO-SnO2 nanoparticles on mechanical properties in the means of Vickers microhardness and find out that they positively affect the microhardness of the PMMA coatings up to a certain concentration. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) reveal quite homogeneous distribution of nanoparticles for lower concentrations and the presence of nanoparticle aggregates for higher concentrations such as 1 wt.% and 5 wt.% of ZnO-SnO2 nanoparticles.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"8 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000002","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/romjphys.2023.68.114
V. Ceban, M. Macovei, A. Isar
"We investigate the collective quantum dynamics of an ensemble of two-level emitters, embedded in a crystal, and coherently pumped by a moderately intense, and externally applied coherent electromagnetic field. The ensemble is damped preponderantly via the surrounding phonon reservoir which mediates the inter-particle collective interactions. We have found that generally phonon transitions among the corresponding dressed states are taking place involving simultaneously many single emitters or pairs of two-level emitters, respectively. In both cases the phonon intensity can be proportional to the squared number of involved two-level emitters."
{"title":"Phonon Mediated Collective Dynamics of Coherently Pumped Two-Level Emitters","authors":"V. Ceban, M. Macovei, A. Isar","doi":"10.59277/romjphys.2023.68.114","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.114","url":null,"abstract":"\"We investigate the collective quantum dynamics of an ensemble of two-level emitters, embedded in a crystal, and coherently pumped by a moderately intense, and externally applied coherent electromagnetic field. The ensemble is damped preponderantly via the surrounding phonon reservoir which mediates the inter-particle collective interactions. We have found that generally phonon transitions among the corresponding dressed states are taking place involving simultaneously many single emitters or pairs of two-level emitters, respectively. In both cases the phonon intensity can be proportional to the squared number of involved two-level emitters.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"21 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999921","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/romjphys.2023.68.208
S. Savotchenko
"New features of the light localization in a nonlinear and graded-index medium in the case of radial symmetry are described analytically. The model of nonlinear graded-index fiber assumes that the dielectric permittivity changes abruptly when the electric field amplitude reaches a certain level. The dielectric permittivity depends on the polar radius according to a parabolic law, in the regions where the electric field amplitude exceeds a certain level. Explicit exact solution to the wave equation is found, in terms of the Whittaker function and the modified Bessel function of the second kind, describing a new type of optical localized structure. The influence of the propagation constant and parameters of the nonlinear graded-index dielectric permittivity on the field profile over the fiber radius is analyzed. It is derived that the core radius and the dielectric permittivity of the core depend on the propagation constant. The dependence of the core radius on the propagation constant causes the appearance of local dispersion."
{"title":"Modes of a Nonlinear Fiber Containing a Parabolic Graded-Index Core with Light Induced Variable Radius","authors":"S. Savotchenko","doi":"10.59277/romjphys.2023.68.208","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.208","url":null,"abstract":"\"New features of the light localization in a nonlinear and graded-index medium in the case of radial symmetry are described analytically. The model of nonlinear graded-index fiber assumes that the dielectric permittivity changes abruptly when the electric field amplitude reaches a certain level. The dielectric permittivity depends on the polar radius according to a parabolic law, in the regions where the electric field amplitude exceeds a certain level. Explicit exact solution to the wave equation is found, in terms of the Whittaker function and the modified Bessel function of the second kind, describing a new type of optical localized structure. The influence of the propagation constant and parameters of the nonlinear graded-index dielectric permittivity on the field profile over the fiber radius is analyzed. It is derived that the core radius and the dielectric permittivity of the core depend on the propagation constant. The dependence of the core radius on the propagation constant causes the appearance of local dispersion.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"93 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998860","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/romjphys.2023.68.621
Mohamed Moustafa, Shadi Yasin, Mohamed Swillam
"This work explores the photovoltaic performance of a high efficiency heterostructure based on CIGS solar cells using SCAPS. Various electrical specifications were explored at various thicknesses and doping densities. Initially, photovoltaic characteristics of the ITO/GaSe/CIGS heterostructure are investigated. The results show an optimized PCE of 22.59%. Then, a thin film strongly doped p-type is employed (CIGS-p+) to the structure. The engagement of the CIGS-p+ layer increases the PCE to 31.94%. The proposed CIGS-p+ layer is interpreted to serve as a back surface field. The structure is further improved by adding a third interfacial layer of p-MoS2 transition metal dichalcogenide material between the absorber and the Mo back contact. Adding a third interfacial layer implied an efficiency increase of 34.55%. The results reveal that the MoS2 layer at the CIGS/Mo interface adapts it creating Schottky-type contact to quasi-ohmic contact. The results confirm the beneficial influence of the interface layers on the CIGS heterostructure. Additionally, the performance of the photovoltaic cell against the defect intensity of the absorber layers is found to degrade behind a level of 1 1018 cm–3. An ITO/GaSe/CIGS/CIGS-p+ based structure exhibited the highest stability in performance against the temperature change among the three examined systems."
{"title":"Boosting Efficiency Up to 34.5 % of CIGS-Based Solar Cells Using a New Heterostructure by Simulation","authors":"Mohamed Moustafa, Shadi Yasin, Mohamed Swillam","doi":"10.59277/romjphys.2023.68.621","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.621","url":null,"abstract":"\"This work explores the photovoltaic performance of a high efficiency heterostructure based on CIGS solar cells using SCAPS. Various electrical specifications were explored at various thicknesses and doping densities. Initially, photovoltaic characteristics of the ITO/GaSe/CIGS heterostructure are investigated. The results show an optimized PCE of 22.59%. Then, a thin film strongly doped p-type is employed (CIGS-p+) to the structure. The engagement of the CIGS-p+ layer increases the PCE to 31.94%. The proposed CIGS-p+ layer is interpreted to serve as a back surface field. The structure is further improved by adding a third interfacial layer of p-MoS2 transition metal dichalcogenide material between the absorber and the Mo back contact. Adding a third interfacial layer implied an efficiency increase of 34.55%. The results reveal that the MoS2 layer at the CIGS/Mo interface adapts it creating Schottky-type contact to quasi-ohmic contact. The results confirm the beneficial influence of the interface layers on the CIGS heterostructure. Additionally, the performance of the photovoltaic cell against the defect intensity of the absorber layers is found to degrade behind a level of 1 1018 cm–3. An ITO/GaSe/CIGS/CIGS-p+ based structure exhibited the highest stability in performance against the temperature change among the three examined systems.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"32 3","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000156","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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