检索结果-南通市图书馆

Continuum Skyrme Hartree-Fock-Bogoliubov theory with Green’s function method for neutron-rich Ca,Ni,Zr,and Sn isotopes

引用

Nuclear Science and Techniques 2023年第7期34卷 162-178页

作者： En-Bo Huo Ke-Ran li Xiao-ying qu ying Zhang Ting-Ting Sun School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Mechatronics Engineering Guizhou Minzu UniversityGuiyang 550025China Department of Physics School of ScienceTianjin UniversityTianjin 300072China Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China

The possible exotic nuclear properties in the neutron-rich Ca,Ni,Zr,and Sn isotopes are examined with the continuum Skyrme Hartree-Fock-Bogoliubov theory in the framework of the Green’s function *** pairing correlation,the couplings with the continuum,and the blocking effects for the unpaired nucleon in odd-A nuclei are properly *** Skyrme interaction SLy4 is adopted for the ph channel and the density-dependentinteraction is adopted for the pp chan-nel,which well reproduce the experimental two-neutron separation energies S_(2n)and one-neutron separation energies *** is found that the criterion S_(n)>0 predicts a neutron drip line with neutron numbers much smaller than those for S_(2n)>*** to the unpaired odd neutron,the neutron pairing energies−E_(pair)in odd-A nuclei are much lower than those in the neighbor-ing even-even *** investigating the single-particle structures,the possible halo structures in the neutron-rich Ca,Ni,and Sn isotopes are predicted,where sharp increases in the root-mean-square(rms)radii with significant deviations from the traditional rA^(1∕3)rule and diffuse spatial density distributions are *** the contributions of various partial waves to the total neutron densityρlj(r)∕ρ(r)reveals that the orbitals located around the Fermi surface-particularly those with small angular momenta-significantly affect the extended nuclear density and large rms *** number of neutrons Nλ(N_(0))occupying above the Fermi surfacen(continuum threshold)is discussed,whose evolution as a function of the mass number A in each isotope is consistent with that of the pairing energy,supporting the key role of the pairing correlation in halo phenomena.

关键词： Neutron-rich nuclei Neutron halo Skyrme Hartree-Fock-Bogoliubov theory Green’s function method

来源：

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

Effects of mean-field and pairing correlations on the Bogoliubov quasiparticle resonance

引用

Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 93-101页

作者： Xiaoying qu ying Zhang School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191China School of Mechatronics Engineering Guizhou Minzu UniversityGuiyang 550025China Department of Physics School of ScienceTianjin UniversityTianjin 300072China

The quasiparticle resonances are investigated by examining three kinds of quasiparticle spectra, i.e., the density of quasiparticle states, the occupation number density, and the pair number density in the continuum Skyrme Hartree-Fock-Bogoliubov theory with the Green’s function method. Taking the weakly bound nucleus 66Ca as an example, the quasiparticle resonant energies and widths extracted from these three kinds of quasiparticle spectra are compared. For the narrow resonances, the extracted resonant energy and the width are consistent with each other. However, it is difficult to use the density of quasiparticle states to identify the broad resonances due to the background of nonresonant continuum. By switching off the pairing potential and/or the Hartree-Fock(HF) potential respectively in the calculation of these quasiparticle spectra, the roles of HF mean-field and pairing correlations in the quasiparticle resonances are demonstrated clearly. It turns out that all the quasiparticle resonances corresponding to the deeply bound, weakly bound and positive-energy single-particle resonant states, are mainly contributed by the HF potential. The pairing potential helps to slightly increase the resonant energy and the width. However, the pairing potential is important to make the nucleons occupy the low-lying nonresonant continuum states near the threshold and take part in the pairing correlations here,especially for the partial waves with small angular momentum ?.

关键词： quasiparticle resonance mean-field pairing correlations Skyrme Hartree-Fock-Bogoliubov theory Green’s function method

来源：

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

Low Temperature Impact Toughness and Fracture Analysis of EN-GJS-400-18-LT Ductile Iron under Instrumented Impact Load

引用

Journal of Iron and Steel Research International 2015年第9期22卷 864-869页

作者： Xin-ning ZHANG ying-dong qu Rong-de li School of Materials Science and Engineering Shenyang University of Technology

The impact toughness of EN-GJS-400-18-LT ductile iron was measured by Charpy V-notch impact test at temperature between-80 and 20℃.The fracture properties were tested under instrumented impact *** impact fracture energy,crack initiation and propagation energy,dynamic loads and the ductile to brittle temperature were ***-dimensional reconstruction of impact fracture morphology was accomplished by confocal laser scanning *** results of quantitative fractography indicate that cleavage fracture produces flatter fracture surfaces accompanying with less absorbed energy during the impact fracture *** indicates that fracture roughness has a close relationship with crack propagation energy at low temperature.

关键词： graphite nodule ductile to brittle transition cleavage fracture deformation twin three-dimensional reconstruction

来源：

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

On the Cauchy problem and peakons of a two-component Novikov system

引用

Science China Mathematics 2020年第10期63卷 1965-1996页

作者： Changzheng qu ying Fu School of Mathematics and Statistics Ningbo UniversityNingbo 315211China School of Mathematics Northwest UniversityXi’an 710127China

We study a two-component Novikov system,which is integrable and can be viewed as a twocomponent generalization of the Novikov equation with cubic *** primary goal of this paper is to understand how multi-component equations,nonlinear dispersive terms and other nonlinear terms affect the dispersive dynamics and the structure of the peaked *** establish the local well-posedness of the Cauchy problem in Besov spaces B^s/p,r with 1 p,r+∞,s>max{1+1/p,3/2}and Sobolev spaces H^s(R)with s>3/2,and the method is based on the estimates for transport equations and new invariant properties of the ***,the blow-up and wave-breaking phenomena of solutions to the Cauchy problem are studied.A blow-up criterion on solutions of the Cauchy problem is *** addition,we show that this system admits single-peaked solitons and multi-peaked solitons on the whole line,and the single-peaked solitons on the circle,which are the weak solutions in both senses of the usual weak form and the weak Lax-pair form of the system.

关键词： two-component Novikov system Hamiltonian structure Camassa-Holm type equation wellposedness peaked soliton

来源：

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

Pt/Mo2C heteronanosheets for superior hydrogen evolution reaction

引用

Journal of Energy Chemistry 2020年第8期29卷 317-323,I0011页

作者： Zhao liu Jing li Shiji Xue Shunfa Zhou Konggang qu ying li Weiwei Cai Sustainable Energy Laboratory Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng UniversityLiaocheng 252059ShandongChina Research Institute for New Materials Technology Chongqing University of Arts and SciencesChongqing 402160China Zhejiang Institute China University of GeosciencesHangzhou 311305ZhejiangChina

One of the most primary challenges to achieve large-scale hydrogen generation from water electrolysis is the sluggish kinetics and noble metal dependence of cathodic hydrogen evolution reaction(HER).By considering the excellent water dissociation catalytic activity of Mo2C, abundant Pt/Mo2C interfaces were facilely engineered via galvanic replacement(gr) by using Mo/Mo2C nanosheets as self-sacrificed templates to alter the alkaline HER mechanism on Pt based catalyst. The rational designed interface-rich gr-Pt/Mo2C catalyst exhibited excellent activity with the overpotential to drive 10 mA/cm2 current density decreased by 18.5 mV compared with the commercial Pt/C catalyst. 34.3 mV/dec Tafel slope confirms the Volmer-Tafel HER route on gr-Pt/Mo2C in alkaline condition. Platinum utilization is calculated to be improved by 9.7 times by considered the low Pt loading in the gr-Pt/Mo2C catalyst. With its satisfied stability, the scalable gr-Pt/Mo2C catalyst shows promising application potential in industrial electrolysis systems.

关键词： Hydrogen evolution reaction Heteronanosheet Galvanic replacement Pt/Mo2C interface Pt utilization

来源：

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

Novel approach for the diagnosis of occult cytomegalovirus cholangitis after pediatric liver transplantation:A case report

引用

World Journal of Clinical Cases 2020年第12期8卷 2597-2602页

作者： ying liu li-ying Sun Zhi-Jun Zhu Wei qu liver Transplantation Center National Clinical Research Center for Digestive DiseasesBeijing Friendship HospitalCapital Medical UniversityBeijing 100050China Intensive Care Unit Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

BACKGROUND Cytomegalovirus(CMV)infection is a common infection in liver transplant recipients,which is related to chronic rejection and biliary *** is often diagnosed based on serum CMV-DNA or CMV *** our knowledge,this is the first report of the successful treatment of occult CMV cholangitis in a pediatric liver transplantation(LT)*** SUMMARY A 7-mo-old baby girl received LT due to biliary atresia and cholestasis *** 1 mo following LT,the patient suffered from aggravated jaundice with no apparent *** imaging results showed intrahepatic and extrahepatic bile duct dilatation,the patient was diagnosed with biliary complications and percutaneous cholangiography and biliary drainage was ***,there was little biliary drainage and her liver function ***-DNA was isolated from the bile with the surprising outcome that 3×106 copies/mL were present,whereas the CMV-DNA in serum was *** antiviral therapy with ganciclovir,she gradually recovered and bilirubin decreased to normal *** the 4-year follow-up period,her liver function remained *** Bile CMV sampling can be used for the diagnosis of occult CMV infection,especially in patients with negative serum CMV-DNA and CMV *** for CMV in the biliary tract may serve as a novel approach for the diagnosis of cholestasis *** diagnosis and treatment will decrease the risk of graft loss.

关键词： Occult cytomegalovirus cholangitis Biliary complications Pediatric liver transplantation Bile cytomegalovirus-DNA detection Case report

来源：

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

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

引用

Science China Chemistry 2025年第01期 288-296页

作者： Shuai liu Wen-Qiang Xu ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-li Zuo Han Guo Zi-Fei Xu ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词：

来源：

同方期刊数据库

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

环境重金属内暴露与既往不良妊娠结局的相关性研究

引用

环境与健康杂志 2019年第4期36卷 341-345页

作者：李园园曲英莉钟格梅司国爱张淼闫慧芳叶秀蔡嘉旖曹兆进中国疾病预防控制中心环境与健康相关产品安全所北京100050 广西壮族自治区疾病预防控制中心广西壮族自治区河池市金城江区疾病预防控制中心中国疾病预防控制中心职业卫生与中毒控制所

目的探讨广西河池地区环境重金属内暴露与既往不良妊娠结局的关系。方法于2013—2014年在广西河池长老乡5个村抽取180名有妊娠史的成年女性,按照是否有既往不良妊娠结局分为不良妊娠组与对照组,以电感耦合等离子质谱法(ICP-MS)检测全血... 详细信息

目的探讨广西河池地区环境重金属内暴露与既往不良妊娠结局的关系。方法于2013—2014年在广西河池长老乡5个村抽取180名有妊娠史的成年女性,按照是否有既往不良妊娠结局分为不良妊娠组与对照组,以电感耦合等离子质谱法(ICP-MS)检测全血中铅、镉、砷、铬水平。以多因素logistic回归分析环境重金属内暴露与既往不良妊娠结局的关系。结果不良妊娠组血Pb几何均值(41.86μg/L)明显高于正常女性(30.48μg/L)(P<0.05),两组间血镉、砷、铬的水平并没有明显差异。血铅的多重线性回归显示,血Pb与年龄及家庭年收入水平呈正相关(P<0.05)。既往不良妊娠结局的多因素logistic回归分析显示,血铅每升高1μg/L,不良妊娠结局发生风险增加3.5%[OR:1.035(95%CI:1.001~1.072)];与肉类日摄入量<100 g的女性相比,肉类日摄入量≥100 g的女性不良妊娠结局发生风险降低[OR:0.112(95%CI:0.011~0.568)]。结论本次调查的广西长老乡女性铅暴露可能与既往不良妊娠结局有关,建议生育期妇女应尽量避免重金属铅暴露。

关键词：金属,重血铅不良妊娠结局肉类日摄入量

来源：

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

基于应急疏散的滨海地下交通枢纽空间精细化分区研究

引用

灾害学 2025年第1期40卷 227-234页

作者：瞿扬李彦潼张赫王睿天津大学建筑学院天津300072

暴雨和洪涝对滨海城市的地下空间构成严重威胁,应急疏散效率在受灾场景中至关重要。研究表明空间分区能有效提高疏散效率。目前传统分区方法依赖单一的最短路径方法,无法兼顾安全与高效。该文基于安全性评估提出了一种精细化分区方法。... 详细信息

暴雨和洪涝对滨海城市的地下空间构成严重威胁,应急疏散效率在受灾场景中至关重要。研究表明空间分区能有效提高疏散效率。目前传统分区方法依赖单一的最短路径方法,无法兼顾安全与高效。该文基于安全性评估提出了一种精细化分区方法。首先以应急疏散为目的,对地下空间按功能划分;其次考虑到灾害风险性、人员聚集性和设施高效性三个维度的影响因素,并构建安全性分区评价体系;最后综合上述因素,构建精细化分区划定体系。文章以深圳红树湾地铁站为案例,验证了新方法在保障疏散安全的同时,提升了疏散效率,为地下交通枢纽的防灾规划提供了理论支持。

关键词：地下交通枢纽空间应急疏散安全性分区精细化分区

来源：

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

Laser fabrication of functional micro-supercapacitors

引用

Journal of Energy Chemistry 2021年第8期30卷 642-665,I0014页

作者： ying Wang Yang Zhao liangti qu Key Laboratory of Cluster Science Ministry of Education of ChinaBeijingKey Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of Technology100081 BeijingChina Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University100084 BeijingChina

Due to the rapid development of portable,wearable and implantable electronics in the fields of mobile communications,biomonitoring,and aerospace or defense,there is an increasing demand for miniaturized and lightweight energy storage ***-supercapacitors(MSCs)possessing long lifetime,high power density,environment friendliness and safety,have attracted great attention *** the performance of the MSCs is mainly related to the structure of the active electrode,there is a great need to explore the efficient fabricating strategies to deterministically coordinate the structure and functionality of *** that laser technology possesses many superior features of facility,high-precision,low-cost,high-efficiency,shape-adaptability and maneuverability,herein we summarize the development of laser technologies in MSCs manufacturing,along with their strengths and *** current achievements and challenges are also highlighted and discussed,aiming to provide a valuable reference for the rational design and manufacture of MSCs in the future.

关键词： Laser technology Micromachining Energy storage Micro-supercapacitor Integration

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：