Journal of Quantitative Spectroscopy & Radiative Transfer最新文献_第8页

Electron scattering from hydrogen atom in dense semi-classical hydrogen plasma: S-wave resonance states 致密半经典氢等离子体中氢原子的电子散射：s波共振态

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-15 DOI: 10.1016/j.jqsrt.2024.109318

Netai Das , Arijit Ghoshal , Yew Kam Ho

{"title":"Electron scattering from hydrogen atom in dense semi-classical hydrogen plasma: S-wave resonance states","authors":"Netai Das , Arijit Ghoshal , Yew Kam Ho","doi":"10.1016/j.jqsrt.2024.109318","DOIUrl":"10.1016/j.jqsrt.2024.109318","url":null,"abstract":"<div><div>The existence and the behaviour of the resonance states in the scattering of electrons from the hydrogen atoms under semi-classical plasma environments are investigated. The organized effect of the plasma charged particles is modelled by a pseudopotential which takes care of the quantum mechanical effect of diffraction at short distances as well as the collective effect of the plasma particles by means of two adjustable parameters, namely the de Broglie wavelength <span><math><mi>λ</mi></math></span> and the screening parameter <span><math><mi>κ</mi></math></span>. An extensive square-integrable basis set is employed within the framework of the stabilization method to determine the S-wave resonance states in the e-H system. In particular, the emergence of three S-wave singlet resonance states is identified by noting the stabilized energy levels, whereas the energy and the width of those states are computed from the fitting of the density of the states with the Lorentzian form. The results for the plasma-free case are in good agreement with the established results in the literature. A comprehensive study is made on the changes in the energy and width of the resonance states as a result of variation in <span><math><mi>λ</mi></math></span> at a given <span><math><mi>κ</mi></math></span>.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109318"},"PeriodicalIF":2.3,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Separated and cooperative influence of components of ice cloud on total extinction of optical radiation 冰云组分对光辐射总消光的分离与协同影响

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-14 DOI: 10.1016/j.jqsrt.2024.109323

Olga Shefer

引用次数: 0

Comparison of atmospheric river-related phenomena with ACE satellite data 大气河流相关现象与ACE卫星数据的比较

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-10 DOI: 10.1016/j.jqsrt.2024.109321

Adam Pastorek , Peter Bernath

{"title":"Comparison of atmospheric river-related phenomena with ACE satellite data","authors":"Adam Pastorek , Peter Bernath","doi":"10.1016/j.jqsrt.2024.109321","DOIUrl":"10.1016/j.jqsrt.2024.109321","url":null,"abstract":"<div><div>We present a comprehensive data analysis of coincident solar occultation data captured by the ACE satellite, alongside the atmospheric river database derived from MERRA-2 reanalysis through the ARTMIP (Atmospheric River Tracking Method Intercomparison Project) initiative. Our investigation, comparing an atmospheric river catalogue by Guan and Waliser (2015) with experimental ACE data, reveals significant differences in altitude-dependent volume-mixing ratios (VMRs) of several molecules (particularly H<sub>2</sub>O, HNO<sub>3</sub>, and O<sub>3</sub>). These differences are observed in pairs of ACE observations that are closely matched in time and location, with one point falling within an identified atmospheric river and the other outside. Additionally, we demonstrate that these differences in VMR profiles are not attributable to random atmospheric turbulence. This is achieved by contrasting our findings with a randomized set of paired ACE observations, where both data points are situated outside of atmospheric rivers. The obtained results corroborate atmospheric mixing between the troposphere and stratosphere during the passage of an atmospheric river through a specific location. Our findings demonstrate the utility of ACE satellite data in observing atmospheric phenomena associated with atmospheric rivers.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109321"},"PeriodicalIF":2.3,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Collision expansion for the radiative transport equation: Analytical results and numerical simulations 辐射输运方程的碰撞展开：分析结果和数值模拟

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-10 DOI: 10.1016/j.jqsrt.2024.109311

Vadim A. Markel , Manabu Machida , John C. Schotland

引用次数: 0

Atmospheric water vapor continuum model for the sub-THz range 亚太赫兹范围的大气水汽连续体模型

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-09 DOI: 10.1016/j.jqsrt.2024.109319

M.Yu. Tretyakov , T.A. Galanina , A.O. Koroleva , D.S. Makarov , D.N. Chistikov , A.A. Finenko , A.A. Vigasin

{"title":"Atmospheric water vapor continuum model for the sub-THz range","authors":"M.Yu. Tretyakov , T.A. Galanina , A.O. Koroleva , D.S. Makarov , D.N. Chistikov , A.A. Finenko , A.A. Vigasin","doi":"10.1016/j.jqsrt.2024.109319","DOIUrl":"10.1016/j.jqsrt.2024.109319","url":null,"abstract":"<div><div>Empirical and semi-empirical models of the continua absorption are still ubiquitously used in atmospheric science and applications despite almost a hundred-years-long persistent theoretical and experimental investigation of the continuum' nature. Based on the empirical knowledge accumulated to-date about the water vapor continuum we propose a physically sound continuum model for practical applications in the subterahertz frequency range (0-1 THz). Our model interpret the water vapor continuum in terms of a combination of various contributions owed to bimolecular absorption. The self-continuum component is presented in the model as a sum of the contributions from absorption by bound and quasibound dimers, which are evaluated with the help of the water vapor second virial coefficient and existing <em>ab initio</em> simulation of the water dimer absorption. The contribution from the far wings of the water monomer resonant lines is taken into account by virtue of a simple analytical function approximating available empirical data. The foreign-continuum component of absorption is taken in a conventional empirical form. The values of its numerical coefficients are updated to achieve better agreement with results of laboratory measurements in the sub-THz range. We demonstrate that our new model is in good agreement with modern versions of atmospheric propagation models. However, the atmospheric brightness temperature calculated using our new model systematically deviates from the results obtained with its empirical version. The deviation amounts up to several Kelvins in the microwindows between resonant water lines.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109319"},"PeriodicalIF":2.3,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

GAAS: GPU accelerated absorption simulator GAAS： GPU 加速吸收模拟器

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-07 DOI: 10.1016/j.jqsrt.2024.109307

Charles S. Callahan , Sean M. Bresler , Sean C. Coburn , David A. Long , Gregory B. Rieker

{"title":"GAAS: GPU accelerated absorption simulator","authors":"Charles S. Callahan , Sean M. Bresler , Sean C. Coburn , David A. Long , Gregory B. Rieker","doi":"10.1016/j.jqsrt.2024.109307","DOIUrl":"10.1016/j.jqsrt.2024.109307","url":null,"abstract":"<div><div>Interpreting measured absorption spectroscopy data can require repeated simulations of the expected absorption spectrum to fit the data. In cases of high temperature or broadband spectra, the computational load of the spectral analysis can be expensive due to the large number of individual absorption transitions that contribute to each simulation. We present a Graphics Processing Unit (GPU) Accelerated Absorption Simulator (GAAS) – a fast, hardware-accelerated, line-by-line absorption simulation software for generating absorption spectra based on Voigt and Hartmann-Tran lineshape profiles. We show that GAAS produces the same output spectra as the <em>hi</em>gh-resolution <em>trans</em>mission molecular absorption database (HITRAN) Application Programming Interface (HAPI) to within 32-bits of numerical precision for spectra based on both Voigt and Hartmann-Tran profiles. We also measure the performance increase compared to HAPI and demonstrate that GAAS can reduce simulation time by up to 115x for spectra containing many (several thousand or more) absorption transitions. The software is provided as an open-source python library which is built around an OpenCL implementation of the Voigt and Hartmann-Tran lineshape functions. GAAS can be run on a variety of GPU hardware including integrated GPUs on most computers and high-performance external GPUs. It is installed as a standalone Python library, making it accessible and easy to use for many applications. GAAS will enable researchers to more efficiently analyze complex spectra, especially using advanced lineshapes, to ultimately increase the accuracy of complex spectroscopic measurements.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109307"},"PeriodicalIF":2.3,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Transmittance of Gaussian beams in biological tissues 生物组织中高斯光束的透射率

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-06 DOI: 10.1016/j.jqsrt.2024.109312

Murat Kaan Özcan , Muhsin Caner Gökçe , Yahya Baykal

引用次数: 0

Convolutional neural network for 2D-reconstructions of rough particles from their experimental speckle images in interferometric particle imaging 干涉粒子成像中粗糙粒子实验散斑图像的卷积神经网络二维重建

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-06 DOI: 10.1016/j.jqsrt.2024.109315

Alexis Abad, Alexandre Poux, Marc Brunel

引用次数: 0

The tenth international symposium on radiative transfer (RAD-23) 第十届辐射转移国际研讨会（RAD-23）

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-05 DOI: 10.1016/j.jqsrt.2024.109276

Dr. Denis Lemonnier , Prof. Brent W. Webb , Prof. Dr. M.Pınar Mengüç (Director)

引用次数: 0

Inversion of optical constants of natural silk fibers based on FDTD-PSO and scattering experiments 基于 FDTD-PSO 和散射实验的天然丝纤维光学常数反演

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-05 DOI: 10.1016/j.jqsrt.2024.109314

Zhengwei Tao, Jun Qiu

{"title":"Inversion of optical constants of natural silk fibers based on FDTD-PSO and scattering experiments","authors":"Zhengwei Tao, Jun Qiu","doi":"10.1016/j.jqsrt.2024.109314","DOIUrl":"10.1016/j.jqsrt.2024.109314","url":null,"abstract":"<div><div>The optical constants of fiber materials are of great value in the study of the mechanism and application of radiation regulation, but the conventional methods for obtaining the optical constants of fiber materials suffer from a series of problems such as compositional differences, chemical residues, and microstructural damages, which make it difficult to obtain the optical constants of the fiber materials and make the final results of the measurements doubtful. In this work, a new intelligent inversion method is developed, based on the first-principles calculations of electromagnetic scattering using Finite Difference Time Domain method and particle swarm optimization algorithm (FDTD-PSO), to obtain the optical constants of fibers through the measurement of the scattered radiation properties of fiber materials and the characterization of their surface microstructures. The feasibility and accuracy of the method are demonstrated by theoretical numerical calculation simulations of different kinds of fibers, and the scale effect and error are analyzed from three aspects, namely, scale parameters, roughness and incident light angle direction. The results show that the dimensions, roughness and incident wavelength of the fiber material are in the sub-wavelength scale interval, which requires high model accuracy and gives the appropriate inversion range interval. Finally, the method is experimentally validated by using the natural silk fibers. This work constructs a complete set of theoretical models and experimental methods to accurately obtain the optical constants of actual fiber materials, which provides a new direction for obtaining the optical constants of fiber materials and a numerical basis for the study of the radiation modulation mechanism of fiber materials.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109314"},"PeriodicalIF":2.3,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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