Romanian Reports in Physics最新文献_第3页

A Liouville integrable hierarchy with four potentials and its bi-Hamiltonian structure 具有四势的Liouville可积层次及其双哈密顿结构

4区物理与天体物理

Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.115

MA WEN-XIU

引用次数: 9

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

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

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

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

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

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":null,"pages":null},"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":null,"pages":null},"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

引用次数: 0

Seismic noise analysis in the microseismic and high-frequency domain at the BURAR seismic stations BURAR地震台站微震和高频域地震噪声分析

4区物理与天体物理

Romanian Reports in Physics Pub Date : 2023-09-15 DOI: 10.59277/romrepphys.2023.75.705

A. TOLEA, C. GRECU, I.A. MOLDOVAN, V.E. TOADER

{"title":"Seismic noise analysis in the microseismic and high-frequency domain at the BURAR seismic stations","authors":"A. TOLEA, C. GRECU, I.A. MOLDOVAN, V.E. TOADER","doi":"10.59277/romrepphys.2023.75.705","DOIUrl":"https://doi.org/10.59277/romrepphys.2023.75.705","url":null,"abstract":"\"In the absence of earthquakes, seismic stations continuously record the Earth's vibrations, called ambient seismic noise (ASN). The main concern regarding the ASN records is improving the seismic data quality using different tools developed especially for this purpose. Power Spectral Densities (PSD) and their corresponding Probability Density Functions (PDF) are tools used to evaluate the station performance and reveal the noise level at the station’s site. For high frequencies (>1 Hz), the noise sources are from cultural activities and show diurnal variation, while for low frequencies (<1 Hz), the noise is generated by natural sources and shows seasonal variation. In this study, we analyzed the vertical components of the Bucovina array seismic network (BURAR) to characterize the noise levels at the stations and investigate noise variations in space and time. We computed four-year spectrograms for some elements of the array that revealed an increase of ASN in the 2–5 Hz frequency range during the warmer seasons, contrary to the colder months. On the other hand, at lower frequencies (0.5–1 Hz), the power of seismic noise increases during the year’s colder months. We examined the relationship between noise levels and weather parameters (e.g., wind speed) for the station where the seismic sensor is collocated, with a weather station. We observed that an increase in wind speed leads to an increase in the noise level at high frequencies (> 2 Hz).\"","PeriodicalId":49588,"journal":{"name":"Romanian Reports in Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135486606","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