检索结果-南通市图书馆

A simulation study on spatial and time resolution for a cost-effective positron emission particle tracking system

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第5期88卷 312-322页

作者： Josephine Oppotsch Matthias steinke Miriam Fritsch Fritz-Herbert Heinsius Thomas Held Nikoline Hilse Viktor Scherer Ulrich Wiedner Ruhr-Universität Bochum Institut für Experimentalphysik I44801 BochumGermany Ruhr-Universität Bochum Lehrstuhl für Energieanlagen und Energieprozesstechnik44801 BochumGermany

This work is the second part of a simulation study investigating the processing of densely packed and moving granular assemblies by positron emission particle tracking (PEPT).Since medical positron emission tomography (PET) scanners commonly used for PEPT are very expensive,a PET-like detector system based on cost-effective organic plastic scintillator bars is being developed and tested for its *** this context,the spatial resolution of a resting positron source,a source moving on a freely designed model path,and a particle motion given by a discrete element method (DEM) simulation is studied using Monte Carlo simulations and the software toolkit *** not only extended the simulation and reconstruction to a moving source but also significantly improved the spatial resolution compared to previous work by adding oversampling and iteration to the reconstruction ***,in the case of a source following a trajectory developed from DEM simulations,a very good resolution of about 1 mm in all three directions and an average 3D deviation between simulated and reconstructed events of 2.3 mm could be ***,the resolution for realistic particle motion within the generic grate system (which is the test rig for further experimental studies) is well below the smallest particle *** simulation of the dependence of the reconstruction accuracy on tracer particle location revealed a nearly constant efficiency within the entire detector system,which demonstrates that boundary effects can be neglected.

关键词： Positron emission particle tracking Monte Carlo method Time-of-flight Plastic scintillators Silicon photomultipliers(SiPMs)

A simulation study for a cost-effective PET-like detector system intended to track particles in granular assemblies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第1期84卷 117-125页

作者： Josephine Oppotsch Antonios Athanassiadis Miriam Fritsch Fritz-Herbert Heinsius Thomas Held Nikoline Hilse Viktor Scherer Matthias steinke Ulrich Wiedner Ruhr-Universität Bochum Institut für Experimentalphysik I44801 BochumGermany Ruhr-Universität Bochum Lehrstuhl für Energieanlagen und Energieprozesstechnik44801 BochumGermany

Since many industrial applications rely on the processing of densely packed and moving granular ma-terial,obtaining bulk internal information on the particle movement inside the reactors is of great *** information can be delivered by Positron Emission Particle Tracking(PEPT).By marking pellets with a positron-emitting radioisotope,the position of these tracer particles can be determined via the time-of-flight differences of the emitted gamma-ray *** current paper proposes a PET-like detector system based on cost-effective organic plastic scintillators instead of the more common but expensive inorganic *** system is currently under construction and was tested for its resolution and efficiency in this simulation *** Monte Carlo simulations and the software toolkit Geant4,three different geometries(an empty glass box,a generic grate system,and a cubic box of 1 m3 completely filled with pellets)were investigated,leading to a spatial resolution in the millimeter range and an efficiency,defined as the ratio of reconstructed decay locations to simulated decays,of 2.7%,1.4%,and 0.3%.

关键词： Positron emission particle tracking Geant4 Monte Carlo method Time-of-flight Plastic scintillators Silicon photomultipliers(SiPMs)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

安阳:古代中国之王城

美成在久 2024年第4期 21-35页

作者：史可安(审校) 王倩(翻译) 不详郑州大学考古与文化遗产学院

三千年钟灵毓秀,河畔人杰地灵,古都安阳令人心驰神往。安阳般墟作为中国历史上第一个有文献可考、并为甲骨文和考古发掘所证实的商代都城遗址,出土的遗迹与遗物,细细诉说着煌煌般商的过往风云……

关键词：考古发掘甲骨文商代都城王城遗址安阳遗迹

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

性辅导和心血管疾病：实用方法

Asian Journal of Andrology 2015年第1期17卷 32-39,I0007页

作者： Elaine E steinke Tiny Jaarsma School of Nursing Wichita State University 1845 Fairmount Wichita Kansas USA University of Linkoping Social and Welfare Studies Norrkoping Sweden.

Patients with cardiovascular disease and their partners expect health care providers to provide sexual counseling to assist them in maintaining sexual quality of life. Evidence suggests however, that there is a gap in integrating evidence into practice and that relatively few cardiac patients receive sexual counseling. This can result in negative psychological, physical, and quality of life outcomes for couples who may needlessly decide sexual activity is too risky and cease all sexual activity. Two scientific statements now exist that provide ample guidance to health care providers in discussing this important topic. Using a team approach that includes physicians, nurses, physical therapists, rehabilitation staff, and others is important to ensure that sexual counseling occurs throughout recovery. In addition, several trials using interventional approaches for sexual counseling provide insight into successful approaches for sexual counseling in practice. This article provides practical strategies and evidence-based approaches for assessment and sexual counseling for all cardiac patients and their partners, and specific counseling for those with ischemic conditions, heart failure, and implanted devices.

关键词： cardiovascular diseases health care providers rehabilitation sexual behavior sexual counseling sexual dysfunction,physiological sexual dysfunction, psychological sexual partners

Proposed Relief Map of the Suitability of the Maranhão River Basin, Brazil, for Anthropogenic Use

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographic Information System 2016年第3期8卷 351-360页

作者： Valdir A. steinke Ercilia Torres steinke Mario Diniz Araujo Neto Maria Ligia Cassol Pinto University of Brasilia Brasília Brazil

In this paper, we proposed a method for mapping the suitability of land for intensive anthropogenic use in the Maranhao River Basin, in the state of Goiás, Brazil. We analyzed existing 1:250,000 maps of the local geology, drainage system topography and geomorphological features. We generated new information based on our analysis, including a compilation of basic morphometric data and a map of the slopes in the basin, which we used to construct the geomorphological suitability map of the watershed. Our results indicate that 40% of the study area can support intensive anthropogenic use;the remaining 60% of the basin area is categorized as “fragile” regarding the expansion of intensive land use.

关键词： Morphometry GIS Environmental Management Suitability of the Watershed Land Use Policy

Wnt genes in colonic polyposis predisposition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第3期10卷 753-757页

作者： Isabel Quintana Mariona Terradas Pilar Mur Iris B.A.Wte Paske Sophia Peters Isabel Spier Verena steinke-Lange Claudia Maestro David Torrents Montserrat Puiggròs Romina Royo Raul Tonda Genís Parra Davide Piscia Sergi Beltrán Matilde Navarro Virginia Piñol Joan Brunet Noemi Gonzalez-Abuin Gemma Aiza Anna Sommer Yasmijn van Herwaarden Galuh Astuti Elke Holinski-Feder Nicoline Hoogerbrugge Richarda Mde Voer Stefan Aretz Gabriel Capellá Laura Valle Hereditary Cancer Program Catalan Institute of OncologyOncobell ProgramIDIBELLHospitalet de LlobregatBarcelona 08908Spain Centro de Investigación Biomédica en Red de Cáncer(CIBERONC) Madrid 28029Spain Department of Human Genetics Radboud Institute for Molecular Life SciencesRadboud University Medical CenterGA Nijmegen 6525the Netherlands Member of SOLVE-RD ERN-GENTURIS Institute of Human Genetics Medical FacultyUniversity of BonnBonn 53127Germany National Center for Hereditary Tumor Syndromes University Hospital BonnBonn 53127Germany Medizinische Klinik Und Poliklinik IV Campus InnenstadtKlinikum Der Universität MünchenMunich 80336Germany MGZ-Medizinisch Genetisches Zentrum Munich 80335Germany Life Sciences Department Barcelona Supercomputing Center(BSC)Barcelona 08034Spain ICREA Barcelona 08010Spain CNAG-CRG Centre for Genomic Regulation(CRG)Barcelona Institute of Science and TechnologyBarcelona 08028Spain Universitat Pompeu Fabra(UPF) Barcelona 08002Spain Department of Genetics Microbiology and StatisticsSchool of BiologyUniversitat de Barcelona(UB)Barcelona 08028Spain Gastroenterology Unit Hospital Universitario de Girona Dr Josep TruetaGirona 17007Spain Catalan Institute of Oncology IDIBGiGirona 17007Spain Department of Gastroenterology and Hepatology Radboud University Medical CenterGA Nijmegen 6525the Netherlands Department of Human Genetics Radboud University Medical CenterGA Nijmegen 6525the Netherlands

Much of the genetic predisposition to polyposis,and particularly to serrated polyposis(SP),remains *** germline pathogenic variants in RNF43,a tumor suppressor that exerts negative feedback in the Wnt/β-catenin signa... 详细信息

关键词： polyposis suppressor colorectal

大电流和电压作用下纵磁场触头的真空灭弧室的弧柱电流

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

真空电器技术 2002年第3期 32-39页

作者： K.steinke 蔡莉

本文研究了在大电流（40－***)和高的瞬态恢复电压陡度（5和10kV/μs)条件下的具有双极纵磁场触头的真空灭弧室的弧柱电流。通过改变触头的分离时刻，相应地改变燃弧时间和触头间距，与模拟值相比较，测量出的弧柱电流和电荷的明显减少... 详细信息

本文研究了在大电流（40－***)和高的瞬态恢复电压陡度（5和10kV/μs)条件下的具有双极纵磁场触头的真空灭弧室的弧柱电流。通过改变触头的分离时刻，相应地改变燃弧时间和触头间距，与模拟值相比较，测量出的弧柱电流和电荷的明显减少以及燃弧时间的缩短是由于电离作用较低引起的，弧后电流与du/dt的关系可以用次级发射的影响来解释。

关键词：大电流电压纵磁场触头真空灭弧室弧柱电流真空断路器

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

银杏浸膏的生物标准化方法

国外医药（植物药分册） 1993年第6期8卷 251-255页

作者： steinke B 庄林根

本文建议用测定抑制血小板激活因子(PAF)引起的血小板聚集作为对市售银杏浸膏生物标准化的方法,本法对银杏苦内酯A、B、C和J是专一的,并且不受浸膏中其他成分的影响。银杏苦内酯B的IC_(50)值可用于标定由专门方法提取的各种银杏浸膏中... 详细信息

本文建议用测定抑制血小板激活因子(PAF)引起的血小板聚集作为对市售银杏浸膏生物标准化的方法,本法对银杏苦内酯A、B、C和J是专一的,并且不受浸膏中其他成分的影响。银杏苦内酯B的IC_(50)值可用于标定由专门方法提取的各种银杏浸膏中等效银杏苦内酯B的含量。为比较化学分析和生物测定的值,必须计算各银杏浸膏中等效银杏总苦内酯的含量,其计算值与气相层析结果一致。所以银杏浸膏制剂除化学标准化外,生物标准化也是可行的。

关键词：银杏浸膏生物标准化体外测试

氧同位素2期珠江河口的孢粉记录及其古环境意义

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

氧同位素2期珠江河口的孢粉记录及其古环境意义