检索结果-南通市图书馆

Solvent Reorganization Energy and Electronic Coupling for Intramolecular Electron Transfer in BiphenyI-Acceptor Anion Radicals

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第1期21卷 45-54页

作者： Jing-bo Wang Jian-yi Ma xiang-yuan Li Fu-cheng He ke-xiang Fu College of Chemical Engineering Sichuan University Chengdu 610065 China Institute for Nanobiomedical Technology and Membrane Biology 5ichuan University Chengdu510055 China

A novel algorithm was designed and implemented to realize the numerical calculation of the solvent reorganization energy for electron transfer reactions, on the basis of nonequilibrium solvation theory and the dielectric polarizable continuum model. Applying the procedure to the well-investigated intramoleeular electron transfer in biphenyl-androstane-naphthyl and biphenyl-androstane-phenanthryl systems, the numerical results of solvent reorganization energy were determined to be around 60 k J/mol, in good agreement with experimental data. Koopman＇s theorem was adopted for the calculation of the electron transfer coupling element, associated with the linear reaction coordinate approximation. The values for this quantity obtained are acceptable when compared with experimental results.

关键词： Nonequilibrium salvation Electron transfer Solvent reorganization energy Continuum model

Development of a computed tomography-based radiomics nomogram for prediction of transarterial chemoembolization refractoriness in hepatocellular carcinoma

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第2期27卷 189-207页

作者： xiang-ke Niu Xiao-Feng He Department of Interventional Radiology Nanfang HospitalSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Interventional Radiology Affiliated Hospital of Chengdu UniversityChengdu 610081Sichuan ProvinceChina

BACKGROUND Some patients with hepatocellular carcinoma(HCC)are more likely to experience disease progression despite continuous transarterial chemoembolization(TACE),which is called TACE *** present,it is still difficult to predict TACE refractoriness,although some models/scoring systems have been *** present,radiological-based radiomics models have been successfully applied to predict cancer patient *** To develop and validate a computed tomography(CT)-based radiomics nomogram for the pre-treatment prediction of TACE *** This retrospective study consisted of a training dataset(n=137)and an external validation dataset(n=81)of patients with clinically/pathologically confirmed HCC who underwent repeated TACE from March 2009 to March *** features were retrospectively extracted from preoperative CT images of the arterial *** pre-treatment radiomics signature was generated using least absolute shrinkage and selection operator Cox regression analysis.A CT-based radiomics nomogram incorporating clinical risk factors and the radiomics signature was built and verified by calibration curve and decision curve *** usefulness of the CT-based radiomics nomogram was assessed by Kaplan-Meier curve *** used the concordance index to conduct head-to-head comparisons of the radiomics nomogram with the other four models(Assessment for Retreatment with Transarterial Chemoembolization score;α-fetoprotein,Barcelona Clinic Liver Cancer,Child-Pugh,and Response score;CT-based radiomics signature;and clinical model).All analyses were conducted according to the transparent reporting of a multivariable prediction model for individual prognosis or diagnosis *** The median duration of follow-up was 61.3 mo(interquartile range,25.5-69.3 mo)for the training cohort and 67.1 mo(interquartile range,32.4-71.3 mo)for the validation *** median number of TACE sessions was 4(range,3-7)in both cohorts.E

关键词： Hepatocellular carcinoma Transarterial chemoembolization Refractoriness Radiomics Nomogram Computed tomography

The Characterizations and Constructions of Sprays of Isotropic Curvature

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第9期38卷 1612-1620页

作者： Xin Yue CHENG ke xiang CAO Chun Yan QING School of Mathematical Sciences Chongqing Normal UniversityChongqing 401331P.R.China

This paper discusses the sprays of isotropic *** first determine the relationship betweenχ-curvatures of two projectively related *** on this,we find an approach to construct sprays of isotropic curvature and find infinitely many sprays of isotropic curvature via some known sprays of isotropic *** particular,by using famous Funk metricΘ,we can construct infinitely many sprays of isotropic curvature,some of which can be induced by Finsler metrics,but others cannot be induced by any Finsler metric.

关键词： Spray spray of isotropic curvature χ-curvature S-curvature Funk metric

Comparison and Extremal Results on Three Eccentricity-based Invariants of Graphs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2020年第1期36卷 40-54页

作者： ke xiang XU Kinkar Chandra DAS Xiao Qian GU College of Science Nanjing University of Aeronautics&AstronauticsNanjing 210016P.R.China Department of Mathematics Sungkyunkwan UniversitySuwon 440-746Republic of Korea

The first and second Zagreb eccentricity indices of graph G are defined as:E1(G)=∑(vi)∈V(G)εG(vi)~2,E2(G)=∑(vivj)∈E(G)εG(vi)εG(vj)whereεG(vi)denotes the eccentricity of vertex vi in *** eccentric complexity C(ec)(G)of G is the number of different eccentricities of vertices in *** this paper we present some results on the comparison between E1(G)/n and E2(G)/m for any connected graphs G of order n with m edges,including general graphs and the graphs with given C(ec).Moreover,a Nordhaus-Gaddum type result C(ec)(G)+C(ec)(■)is determined with extremal graphs at which the upper and lower bounds are attained respectively.

关键词： Eccentricity(of vertex) first Zagreb eccentricity index second Zagreb eccentricity index eccentric complexity diameter

Performance Evaluation of Memory-Centric ARMv8 Many-Core Architectures:A Case Study with Phytium 2000+

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2021年第1期36卷 33-43页

作者： Jian-Bin Fang xiang-ke Liao Chun Huang De-Zun Dong College of Computer National University of Defense TechnologyChangsha 410073China

This article presents a comprehensive performance evaluation of Phytium 2000+,an ARMv8-based 64-core *** focus on the cache and memory subsystems,analyzing the characteristics that impact the high-performance computing *** provide insights into the memory-relevant performance behaviours of the Phytium 2000+system through *** the help of the well-known roofline model,we analyze the Phytium 2000+system,taking both memory accesses and computations into *** on the knowledge gained from these micro-benchmarks,we evaluate two applications and use them to assess the capabilities of the Phytium 2000+*** results show that the ARMv8-based many-core system is capable of delivering high performance for a wide range of scientific kernels.

关键词： many-core architecture memory-centric design performance evaluation

Efficient extraction of U(VI)ions from solutions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第1期34卷 13-22页

作者： Ya‑Wen Cai Ming Fang Bao‑Wei Hu xiang‑ke Wang School of Life Science Shaoxing UniversityShaoxing 312000China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China

The rapid development of advanced techniques for selective and efficient U(Ⅵ) extraction from aqueous solutions is essential for addressing U(Ⅵ) environmental pollution and energy issues. Here, we share recent progress in U(Ⅵ) extraction from aqueous solutions, especially the most frequently applied techniques such as adsorption, catalysis(photocatalysis, piezocatalysis, and electrocatalysis), chemical deposition, and reduction by zero-valent metal particles. We attempt to elucidate the strategies and various mechanisms that contribute to the enhancement of selective U(Ⅵ) extraction. At the end of our review, we highlight the outlook, challenges, and prospects for the development of this field.

关键词： Uranium extraction Adsorption Catalysis Reduction Chemical deposition

Advances in biomineralization-inspired materials for hard tissue repair

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2021年第4期13卷 345-369页

作者： Shuxian Tang Zhiyun Dong xiang ke Jun Luo Jianshu Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduChina Med-X Center for Materials Sichuan UniversityChengduChina

Biomineralization is the process by which organisms form mineralized tissues with hierarchical structures and excellent properties,including the bones and teeth in *** underlying mechanisms and pathways of biomineralization provide inspiration for designing and constructing materials to repair hard *** particular,the formation processes of minerals can be partly replicated by utilizing bioinspired artificial materials to mimic the functions of biomolecules or stabilize intermediate mineral phases involved in ***,we review recent advances in biomineralization-inspired materials developed for hard tissue ***-inspired materials are categorized into different types based on their specific applications,which include bone repair,dentin remineralization,and enamel ***,the advantages and limitations of these materials are summarized,and several perspectives on future directions are discussed.

关键词： utilizing limitations summarized

On a Novel Eccentricity-based Invariant of a Graph

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2016年第12期32卷 1477-1493页

作者： ke xiang XU Kinkar Ch.DAS Ayse Dilek MADEN College of Science Nanjing University of Aeronautics & Astronautics Department of Mathematics Sungkyunkwan University Department of Mathematics Faculty of ScienceSelcuk University

In this paper, for the purpose of measuring the non-self-centrality extent of non-self- centered graphs, a novel eccerttricity-based invariant, named as non-self-centrality number （NSC num- ber for short）, of a graph G is defined as follows： N（G） =∑vi,vj∈V（G）｜ei-ej｜ where the summation goes over all the unordered pairs of vertices in G and ei is the eccentricity of vertex vi in G, whereas the invariant will be called third Zagreb eccentricity index if the summation only goes over the adja- cent vertex pairs of graph G. In this paper, we determine the lower and upper bounds on N（G） and characterize the corresponding graphs at which the lower and upper bounds are attained. Finally we propose some attractive research topics for this new invariant of graphs.

关键词： Eccentricity non-self-centered graph non-self-centrality number third Zagreb eccentricity index diameter

Comparison between Merrifield–Simmons Index and Wiener Index of Graphs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第12期38卷 2220-2230页

作者： ke xiang XU Kinkar Chandra DAS Ivan GUTMAN Meng Lu WANG College of Mathematics Nanjing University of Aeronautics&AstronauticsNanjing 210016P.R.China MIIT key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles Nanjing 210016P.R.China Department of Mathematics Sungkyunkwan UniversitySuwon16419Republic of Korea Facultyof Science Universityof KragujevacP.O.Bor 6034000 KragujevacSerbia

The Merrifield–Simmons indexσis the total number of independent vertex sets(including the empty set)of the graph *** Wiener index W is the sum of distances in all unordered pairs of vertices of *** construct some new graphs satisfyingσ>W and W>σ,*** particular,infinite graphs satisfying W>σare invented with graphs with diameter 2 and infinite ones satisfyingσ>W are discovered with so-called universally diametrical graphs.

关键词： Merrifield–Simmons index Wiener index Cartesian product independence number Fibonacci number universally diametrical graph