Journal of Quantitative Spectroscopy & Radiative Transfer最新文献_第6页

Emission of electrons and photons and formation of cascade ions during the decay of 125I radionuclide 125I 放射性核素衰变过程中电子和光子的发射以及级联离子的形成

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-09 DOI: 10.1016/j.jqsrt.2025.109348

A.P. Chaynikov, A.G. Kochur, A.I. Dudenko

{"title":"Emission of electrons and photons and formation of cascade ions during the decay of 125I radionuclide","authors":"A.P. Chaynikov, A.G. Kochur, A.I. Dudenko","doi":"10.1016/j.jqsrt.2025.109348","DOIUrl":"10.1016/j.jqsrt.2025.109348","url":null,"abstract":"<div><div>Emission of electrons and photons during the cascade decay of inner-shell vacancies created after the decay of unstable <sup>125</sup>I radionuclide is simulated by construction and analysis of the cascade decay trees in isolated-ion approximation. The yields of final cascade ions, the number of emitted electrons and photons, and their spectra, are calculated. During one transformation of <sup>125</sup>I, the total energy emitted to the environment is 61.7 keV, of which 43.3 keV is emitted by photons, mostly high-energy <em>KL</em> photons produced at the first step of the decays of the 1<em>s</em> vacancies. If <sup>125</sup>I is used as an agent for Auger therapy of cancer, only the energy absorbed by the tumor tissues in the nearest vicinity of the emitter is important. This energy is 18.6 keV, most of which is provided by cascade-produced electrons. The contribution of low-energy photons and cascade-produced ions to local energy deposition are 0.15 keV and 0.7 keV, respectively. Additional monopole ejection of electrons (shake off) during the cascades progression, and upon the internal conversion of <sup>125</sup>Te* nuclide produced by the electron capture decay of <sup>125</sup>I, is shown to affect little the final ions charges and emitted energies.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"334 ","pages":"Article 109348"},"PeriodicalIF":2.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990275","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

Speed up the beam shape coefficient evaluation by using scalar spherical wave expansion and scalar translational addition theorem 利用标量球面波展开和标量平动加法定理加快了梁形系数的计算速度

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-09 DOI: 10.1016/j.jqsrt.2025.109343

Jianqi Shen , Yu Wang , Shiliang Zhong , Yiqian Tian , Haoyu Jiang

引用次数: 0

A new theoretical method for remotely assessing the health of date palm trees using the scattering/absorption ratio of obliquely incident electromagnetic waves 一种利用斜入射电磁波散射/吸收比远程评估枣椰树健康状况的新理论方法

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-08 DOI: 10.1016/j.jqsrt.2025.109342

Afshin Moradi , Mohammed M. Bait-Suwailam

{"title":"A new theoretical method for remotely assessing the health of date palm trees using the scattering/absorption ratio of obliquely incident electromagnetic waves","authors":"Afshin Moradi , Mohammed M. Bait-Suwailam","doi":"10.1016/j.jqsrt.2025.109342","DOIUrl":"10.1016/j.jqsrt.2025.109342","url":null,"abstract":"<div><div>The present work explores the application of microwave remote sensing to distinguish between healthy and infested date palm trees, using a novel approach centered around the scattering to absorption width ratio (SAWR). Through comprehensive analytical formulations and numerical modeling, we investigate the interaction of palm trees with microwaves at oblique incidence, specifically at a frequency of 2.45 GHz (ISM-band). The study examines the behavior of TE<span><math><msup><mrow></mrow><mrow><mi>z</mi></mrow></msup></math></span> and TM<span><math><msup><mrow></mrow><mrow><mi>z</mi></mrow></msup></math></span> polarizations waves (relative to the <span><math><mi>z</mi></math></span>-axis), providing detailed analyses of their scattering and absorption characteristics as functions of incident angles. Our findings demonstrate that the SAWR metric is a promising indicator for assessing palm tree health, effectively differentiating between healthy and pest-infested trees. This research offers a non-destructive, real-time method for monitoring tree health, with significant implications for pest detection in agricultural practices.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109342"},"PeriodicalIF":2.3,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967935","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

Characteristics of photonic jet formed by an eccentrically coated dielectric sphere 偏心涂层介质球形成的光子射流的特性

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-04 DOI: 10.1016/j.jqsrt.2025.109340

Huiling Liu, Xingxing Han, Bei Zhao, Jing Shi, Le Zhu

引用次数: 0

Simulation of backscattering phase function with the geometric optics method using a paired ray-tracing technique 用配对光线追踪技术的几何光学方法模拟后向散射相函数

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-03 DOI: 10.1016/j.jqsrt.2025.109341

Chen Zhou , He Huang , Lei Bi

{"title":"Simulation of backscattering phase function with the geometric optics method using a paired ray-tracing technique","authors":"Chen Zhou , He Huang , Lei Bi","doi":"10.1016/j.jqsrt.2025.109341","DOIUrl":"10.1016/j.jqsrt.2025.109341","url":null,"abstract":"<div><div>Geometric optics methods with intensity mapping have been widely used to calculate the single-scattering properties of randomly oriented non-spherical particles with large size parameters, but the backscattering phase functions are often underestimated. The primary reason is that the coherent backscatter enhancement (CBE) is not addressed when the intensity mapping technique is used. In this paper, the phase difference between each pair of conjugate reversible rays is computed in the ray-tracing module of the improved geometric optics method (IGOM), and the effect of CBE is incorporated by considering the interference between conjugate rays. The phase functions of regular hexagons, roughened hexagons, and spheroids with different size parameters and refractive indices are simulated using both the original IGOM and the IGOM with CBE considered (IGOM-CBE), and the results are compared to rigorous numerical simulations that solve Maxwell's equations. The results show that the near-backscattering phase functions calculated with the IGOM-CBE are more consistent with rigorous numerical simulations for all cases, indicating that the paired ray-tracing process effectively improves the backscatter simulated by the geometric optics method.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"334 ","pages":"Article 109341"},"PeriodicalIF":2.3,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967936","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

Saha–Boltzmann method in plasma diagnostics: What can we obtain from a strict approach? 血浆诊断中的Saha-Boltzmann方法：严格的方法能得到什么？

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-02 DOI: 10.1016/j.jqsrt.2024.109338

Luka Rajačić, Nikodin V. Nedić, Dejan Dojić, Miloš Skočić, Srdjan Bukvić

引用次数: 0

On a relationship between acoustical (more generally scalar) beam shape coefficients and electromagnetic beam shape coefficients of some T-matrix theories for structured beams 关于结构梁的一些t矩阵理论中声学（一般是标量）波束形状系数与电磁波束形状系数之间的关系

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2025-01-01 DOI: 10.1016/j.jqsrt.2024.109329

Gérard Gouesbet , Leonardo A. Ambrosio , Jianqi Shen

引用次数: 0

Global carbon monoxide retrieval from the hyperspectral infrared atmospheric sounder-II onboard FengYun-3E in a dawn-dusk sun-synchronous orbit 从黎明-黄昏太阳同步轨道上的风云- 3e上的高光谱红外大气探测仪- ii获取全球一氧化碳

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-30 DOI: 10.1016/j.jqsrt.2024.109336

Zhao-Cheng Zeng

{"title":"Global carbon monoxide retrieval from the hyperspectral infrared atmospheric sounder-II onboard FengYun-3E in a dawn-dusk sun-synchronous orbit","authors":"Zhao-Cheng Zeng","doi":"10.1016/j.jqsrt.2024.109336","DOIUrl":"10.1016/j.jqsrt.2024.109336","url":null,"abstract":"<div><div>This study presents an information content analysis of the retrieval of global carbon monoxide (CO) from the 2<sup>nd</sup> generation of Hyperspectral Infrared Atmospheric Sounder on board Fengyun-3E (FY-3E/HIRAS-II), which is the world's first dawn-dusk orbiting meteorological satellite for civilian use with equatorial overpass times at about 5:30am/pm. Using the distinctive absorption features of CO around 2145 cm-1 in the infrared band, a retrieval algorithm based on optimal estimation is first developed to retrieve the CO profiles from FY-3E/HIRAS-II. The thermal contrast, defined as the temperature difference between the surface and the lower atmosphere, is then examined for the FY-3E/HIRAS-II observations to investigate the potential sensitivity of the observations. Retrievals of CO columns on four representative days over four seasons reveal strong enhancements from global wildfire emissions. Furthermore, the information content from the spectra, quantified by the degree of freedom for signal (DOFS), is assessed using the retrievals. The retrievals are compared with model simulations, which show good agreement. Finally, synthetic experiments are performed to investigate the impacts of thermal contrast and the vertical structure of wildfire-induced CO enhancement on the observational sensitivity. The result highlights the effectiveness of observing wildfire-induced CO enhancement during the dawn and dusk hours, even when thermal contrast conditions are not favorable. This study demonstrates the capability of FY-3E/HIRAS-II to monitor global CO, which sheds light on the potential benefits of adding dawn-dusk orbit observations to the current global air quality observations from mid-morning and early-afternoon orbit constellations.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109336"},"PeriodicalIF":2.3,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929289","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

Atmospheric Chemistry Experiment (ACE) satellite observations of aerosols and SO2 emissions from the 2024 Ruang volcanic eruption 2024年阮氏火山喷发气溶胶和SO[公式省略]排放的大气化学实验（ACE）卫星观测

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-28 DOI: 10.1016/j.jqsrt.2024.109333

Randika Dodangodage , Peter F. Bernath , Matthew Wyatt , Chris Boone

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Ro-vibrational levels of acetylene isotopologues calculated from new potential energy surface 由新势能面计算的乙炔同位素的反振动能级

IF 2.3 3区物理与天体物理

Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-28 DOI: 10.1016/j.jqsrt.2024.109337

Alexander E. Protasevich, Andrei V. Nikitin

{"title":"Ro-vibrational levels of acetylene isotopologues calculated from new potential energy surface","authors":"Alexander E. Protasevich, Andrei V. Nikitin","doi":"10.1016/j.jqsrt.2024.109337","DOIUrl":"10.1016/j.jqsrt.2024.109337","url":null,"abstract":"<div><div>Ro-vibrational energy levels of acetylene isotopologues are reported using variational nuclear motion calculations from empirically optimized full six-dimensional potential energy surface (PES) in the ground electronic state. This surface is based on pure ab initio PES of H<sup>12</sup>C<sup>12</sup>CH which took into account the triple, quadruple and quintuple excitations as well as relativistic and diagonal Born-Oppenheimer corrections (DBOC). Variational calculations of the motion of nuclei for all isotopologues were carried out using one exact kinetic energy operator in which only the masses of the atoms were changed. Experimental values of 1529 ro-vibrational levels up to <em>J</em> = 10 of the main isotopologue were used to empirically adjust some 58 lower-order parameters of the PES. The unweighted average RMS for empirically optimized PES is 0.0953 cm<sup>−1</sup>. Ro-vibrational energy levels of H<sup>12</sup>C<sup>12</sup>CH, H<sup>13</sup>C<sup>13</sup>CH, D<sup>12</sup>C<sup>12</sup>CD, D<sup>13</sup>C<sup>13</sup>CD, H<sup>12</sup>C<sup>13</sup>CH, H<sup>12</sup>C<sup>12</sup>CD, H<sup>12</sup>C<sup>13</sup>CD, H<sup>13</sup>C<sup>12</sup>CD, D<sup>12</sup>C<sup>13</sup>CD up to <em>J</em> = 10 were calculated in the ground electronic state. Calculated ro-vibrational energy levels of H<sup>12</sup>C<sup>12</sup>CH, H<sup>13</sup>C<sup>13</sup>CH, D<sup>12</sup>C<sup>12</sup>CD, H<sup>12</sup>C<sup>13</sup>CH, H<sup>12</sup>C<sup>12</sup>CD isotopologues were compared with high precision empirical energy levels available in literature.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109337"},"PeriodicalIF":2.3,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929287","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}

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