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The use of Laplace transform in the inverse problem from bound states 拉普拉斯变换在束缚态反问题中的应用
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.114
R. MEZHOUD, I. AMI, R. J. LOMBARD
{"title":"The use of Laplace transform in the inverse problem from bound states","authors":"R. MEZHOUD, I. AMI, R. J. LOMBARD","doi":"10.59277/romrepphys.2023.75.114","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.114","url":null,"abstract":"\"In a previous work dedicated to non-relativistic quantum mechanics in the three-dimensional space with spherical symmetry, we have shown the possibility of reconstructing the ground state density from its moments in the case of bound states. The method is based on relationships connecting these moments to the lower energy of each state of angular momentum `. The ground state density yields the ground state wave function, which allows us to calculate the equivalent local potential by inverting the Schrodinger equation. This calculus uses the Fourier transform of the ground state density ρ(r). The aim of this work is to check how to improve the results by replacing the Fourier transform by the Laplace transform of the quantity r2 ρ(r). The method is first presented. Then examples and results are compared to those obtained previously. \"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"140 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":"135486609","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}
引用次数: 0
Testing of a new ionizing radiation detector based on multimode optical fibers 基于多模光纤的新型电离辐射探测器的测试
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.804
E. S BĂDIȚA, P. E MEREUȚĂ, C. BURDUCEA
{"title":"Testing of a new ionizing radiation detector based on multimode optical fibers","authors":"E. S BĂDIȚA, P. E MEREUȚĂ, C. BURDUCEA","doi":"10.59277/romrepphys.2023.75.804","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.804","url":null,"abstract":"\"This paper presents our results investigation to evaluation effects of the electron beams radiation generated in multimode optical fibers at high irradiation doses in order to develop an ionizing radiation dosimeter. The radiation induced attenuation has been shown to exhibit a linear dependence as a function on the applied dose on a certain doses range and after the irradiation the optical fibers go through a “recovery process” during which the optical properties improve again. The surface morphological changes due to electron beam irradiation were investigated by Scanning Electron Microscopy and Atomic Force Microscopy.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"36 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":"135486603","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}
引用次数: 0
Disentangling between static and kinetic effects in the hysteresis of spin crossover molecular magnets 自旋交叉分子磁体迟滞中静、动效应的解缠
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.502
ALEXANDRA ANDRIESEI, DIANA PLESCA, ROXANA CAPU, RALUCA-MARIA STAN, RADU TANASA, CRISTIAN ENACHESCU
{"title":"Disentangling between static and kinetic effects in the hysteresis of spin crossover molecular magnets","authors":"ALEXANDRA ANDRIESEI, DIANA PLESCA, ROXANA CAPU, RALUCA-MARIA STAN, RADU TANASA, CRISTIAN ENACHESCU","doi":"10.59277/romrepphys.2023.75.502","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.502","url":null,"abstract":"\"We investigate the kinetic hysteresis of spin crossover molecular magnets, with the aim of unravelling the link between static and dynamical effects observed in the first order reversal curves (FORC) diagrams. Using a mean-field model, we establish how the FORCs distributions are influenced by both the kinetic effects and the physical parameters of the system.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"58 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":"135486610","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}
引用次数: 0
Generation of high-energy near-infrared femtosecond laser pulses by optical parametric amplification in YCOB crystals YCOB晶体中光学参量放大产生高能近红外飞秒激光脉冲
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.405
R. DABU
{"title":"Generation of high-energy near-infrared femtosecond laser pulses by optical parametric amplification in YCOB crystals","authors":"R. DABU","doi":"10.59277/romrepphys.2023.75.405","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.405","url":null,"abstract":"\"The energy of near-infrared femtosecond laser pulses generated by optical parametric amplification (OPA) in β-barium borate (BBO) crystals pumped by femtosecond Ti:sapphire lasers is restricted to few-mJ due to the 20 mm limited diam- eter of available crystals. In a type I collinear OPA with an yttrium calcium oxoborate (YCOB) crystal, pumped with femtosecond Ti:sapphire lasers at 800 nm wavelength, the 1300 nm signal wavelength and 2080 nm idler wavelength are located in the normal and anomalous group velocity dispersion range, respectively. Due to the small group velocity mismatch (GVM) between signal and idler pulses, as broad as 27 THz gain bandwidth can be obtained in a 3-mm YCOB crystal at 100 GW/cm2 pump intensity. A high parametric gain is the result of the increased parametric interaction length due to the different signs of GVM between pump-signal and pump-idler pulses. More than 10-mJ energy femtosecond laser pulses at 1300 nm wavelength can be generated by OPA in YCOB crystals with larger than 50 mm clear aperture.\"","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":"135486612","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}
引用次数: 0
Evaluating the probable maximum precipitation. Case study from the Dobrogea region, Romania 估计可能的最大降水。来自罗马尼亚多布罗吉亚地区的案例研究
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.704
A. BĂRBULESCU, C. MAFTEI
{"title":"Evaluating the probable maximum precipitation. Case study from the Dobrogea region, Romania","authors":"A. BĂRBULESCU, C. MAFTEI","doi":"10.59277/romrepphys.2023.75.704","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.704","url":null,"abstract":"\" In this article, the Probable Maximum Precipitation (PMP) evaluation is done using a spatio-temporal approach – Diaconu’s method – for a set of data series collected in the Dobrudja region for 41 years. The results are compared with those obtained by applying the classical method of Hershfield and the advantages of each method are emphasized.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"559 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":"135486604","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}
引用次数: 0
Effect of a multilevel impurity on the dynamics of 3D extremely short optical pulse in a photonic crystal of carbon nanotubes 多层杂质对碳纳米管光子晶体三维极短光脉冲动力学的影响
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.406
Y.V. DVUZHILOVA, I.S. DVUZHILOV, N.N. KONOBEEVA, M.B. BELONENKO
{"title":"Effect of a multilevel impurity on the dynamics of 3D extremely short optical pulse in a photonic crystal of carbon nanotubes","authors":"Y.V. DVUZHILOVA, I.S. DVUZHILOV, N.N. KONOBEEVA, M.B. BELONENKO","doi":"10.59277/romrepphys.2023.75.406","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.406","url":null,"abstract":"\"In this paper, we consider the dynamics of three-dimensional extremely short optical pulses in a medium with a spatially variable refractive index (photonic crystal) based on carbon nanotubes. The transitions between impurity levels in carbon nanotubes are taken into account. It has been established that pulses propagate stably with conservation of energy in a limited region of space. The effect of modulation parameters of the refractive index of a photonic crystal on the shape and group velocity of the pulse wave packet is obtained. The rate of one- and two- photon ionization in such medium is estimated.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"3 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":"135486611","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}
引用次数: 0
Massive black hole growth using the star gulping mechanism 使用恒星吞噬机制的大质量黑洞生长
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.204
L. I. CARAMETE, R. A. BALAȘOV, A. M. PĂUN
{"title":"Massive black hole growth using the star gulping mechanism","authors":"L. I. CARAMETE, R. A. BALAȘOV, A. M. PĂUN","doi":"10.59277/romrepphys.2023.75.204","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.204","url":null,"abstract":"\"The evolution of merging black holes (BHs) and their associated processes will be the center-piece study for the upcoming gravitational waves (GWs) observatories, including the LISA Space Mission from ESA. We ran simulations specifically for studying the BH growth, in order to provide estimates regarding the detection rates for the future GW laboratories. Here, we describe the results of our investigations for a new implementation regarding the BH growth, star gulping (SG), in which stars are absorbed by BHs. The current scientific literature emphasizes two main mechanisms for the growth of BHs: accretion of surrounding material and merging with another BH. By taking into account both methods, one can begin to model the growth processes of the most massive BHs (MBHs) from the moment of their origin to current observations. Our previous work showed that even if you consider these processes at their maximum, it is very difficult to grow BHs to the masses and concentrations that we measure today. Therefore, we performed detailed simulations in order to study another growth mechanism, star gulping (SG), that has the potential to add more mass to BHs.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"9 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":"135486441","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}
引用次数: 0
Highly sensitive refractive index, chemical potential, and applied electrical voltage detection in terahertz region with photonic spin Hall effect in a plasmonic sensor based on graphene and germanium layers 基于石墨烯和锗层的等离子体传感器中光子自旋霍尔效应的高灵敏度折射率、化学势和太赫兹区应用电压检测
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.407
V. A. POPESCU
{"title":"Highly sensitive refractive index, chemical potential, and applied electrical voltage detection in terahertz region with photonic spin Hall effect in a plasmonic sensor based on graphene and germanium layers","authors":"V. A. POPESCU","doi":"10.59277/romrepphys.2023.75.407","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.407","url":null,"abstract":"\"In this work, a transverse spin-dependent shift (SDS) of the horizontal photonic spin Hall effect (PSHE) at a fixed frequency (5 THz) is simulated for detection of refractive index, chemical potential, and applied electrical voltage to a plasmonic sensor with four layers (germanium, organic layer, graphene, and gas medium). The variation of the refractive index of graphene with chemical potential and applied voltage is given from the simulated values. A refractive index resolution (1.73 × 10–12 RIU) is obtained when the refractive index n4 of the analyte layer is changed from 1 RIU to 1.1 RIU when the chemical potential μc is 0.003 eV and the amplified angle ∆ is 0.1°. A chemical potential resolution (6.32 × 10–14 eV) and corresponding voltage resolution (6.83 × 10–13 V) are obtained when the chemical potential is changed from 0.003 eV to 0.03 eV, the refractive index of gas medium n4 is 1.1 RIU and the amplified angle is ∆ = 0.1°. These values are very good in comparison with the situation when the spin Hall effect is not applied (7.47 × 10–6 RIU, 0.001166 eV, and 0.01259 V) for the same values of μc, n4, and ∆.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"58 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":"135486444","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}
引用次数: 0
A (3+1)-dimensional integrable Calogero-Bogoyavlenskii-Schiff equation and its inverse operator: lump solutions and multiple soliton solutions (3+1)维可积Calogero-Bogoyavlenskii-Schiff方程及其逆算子:块解和多孤子解
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.116
ABDUL-MAJID WAZWAZ, RANIA A. ALHARBEY, S. A. EL-TANTAWY
{"title":"A (3+1)-dimensional integrable Calogero-Bogoyavlenskii-Schiff equation and its inverse operator: lump solutions and multiple soliton solutions","authors":"ABDUL-MAJID WAZWAZ, RANIA A. ALHARBEY, S. A. EL-TANTAWY","doi":"10.59277/romrepphys.2023.75.116","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.116","url":null,"abstract":"\"In this work, we built a (3+1)-dimensional integrable equation. We started by reformulating the main equation of our model by combining the recursion operator of the Calogero-Bogoyavlenskii-Schiff equation with its inverse recursion op- erator. We confirm the complete integrability of our new developed equation by demon- strating that it satisfies the Painlev´e property. We get a variety of lump solutions that are obtained under specific constraints. Furthermore, we used the simplified Hirota’s direct approach to find multiple soliton solutions to the new evolution equation. In ad- dition, other techniques are used to solve the new evolution equation, in order to get some physically relevant solutions.\"","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":"135486613","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}
引用次数: 0
Magnetically active composites with relatively giant dielectric permittivity 具有较大介电常数的磁活性复合材料
4区 物理与天体物理
Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.503
M. BUNOIU, G.-E. IACOBESCU, G. PASCU, L. CHIRIGIU, I. BICA
{"title":"Magnetically active composites with relatively giant dielectric permittivity","authors":"M. BUNOIU, G.-E. IACOBESCU, G. PASCU, L. CHIRIGIU, I. BICA","doi":"10.59277/romrepphys.2023.75.503","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.503","url":null,"abstract":"\"Magnetically active composites based on silicone rubber, silicone oil, carbonyl microparticles, graphene nanopallets and fabric, as a reinforcing element, are manufactured. For a constant amount of carbonyl iron microparticles and silicone oil, and for different ratios between the amounts of silicone rubber and graphene nanopalets, three composite samples are prepared. Using the plane capacitor method, the relative permittivity of the composites is determined. It is shown that by using graphene nanopallets, composites with giant values of relative dielectric permittivity can be obtained and that the relative dielectric permittivity values are sensitive to the magnetic force induced by the static magnetic field superimposed on the medium-frequency electric field. Using the model of the dipolar magnetic approximation and elements of the theory of dielectrics in medium frequency electric fields, the mechanisms participating in the obtained effects are described.\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":"15 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":"135486607","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}
引用次数: 0
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