检索结果-南通市图书馆

A simple model for two-proton radioactivity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第10期48卷 247-255页

作者： Jie-dong Jiang Xiao Liu dong-meng Zhang Ming Li Xi-Jun Wu Xiao-Hua Li School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Math and Physics University of South ChinaHengyang 421001China National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this work,considering the preformation factor of the emitted two protons in parent nucleus S_(2p) and the effect of the parent nucleus deformation,based on the Wentzel-Kramers-Brillouin approximation and Bohr-Sommerfeld quantization condition,we improve a simple phenomenological model proposed by Bayrak[***.G:47,025102(2020)]to systematically study 2p radioactivity *** model contains two adjustable parameters V_(0) and a_(β),which are related to the depth of nuclear potential and effect of *** calculated results show that this model can effectively reproduce the experimental data with a corresponding root-mean-square(RMS)standard deviation of σ=*** comparison,we include the Gamow-like model(GLM)proposed by Liu et al.[***.C 45,044110(2021)],generalized liquid drop model(GLDM)proposed by Cui et al.[***.C 101,014301(2020)],effective liquid drop model(ELDM)proposed by *** et al.[***.B 774,14(2017)],two-potential approach with Skyrme-Hartree-Fock(TPASHF)proposed by Pan et al.[***.C 45,124104(2021)],phenomenological model with a screened electrostatic barrier(SEB)propoesed by Zou et al.[***.C 45,104101(2021)],unified fission model(UFM)proposed by Xing et al.[***.C 45,124105(2021)],Coulomb and proximity potential model for deformed nuclei(CPPMDN)proposed by Santhosh[***.C 104,064613(2021)],two-parameter empirical formula proposed by Liu et al.[***.C 45,024108(2021)],and four-parameter empirical formula proposed by Sreeja et al.[***.J.A 55,33(2019)].In addition,we use this model to 2p predict the radioactive half-lives of some possible potential nuclei whose 2p radioactivity are energetically allowed or observed but not yet quantified in NUBASE2020.

关键词： two-proton radioactivity half-lives Wentzel-Kramers-Brillouin approximation

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

流量调节器管路系统自激振荡及稳定性

航空学报 2024年第11期45卷 272-287页

作者：董蒙邢理想徐浩海西安航天动力研究所液体火箭发动机技术重点实验室西安710100 航天推进技术研究院西安710100

流量调节器管路系统是液氧煤油发动机中的重要模块,通过探究该系统的稳定性特征,为减小参数振荡的改进措施提供方向。通过非线性与小偏差线性方法,揭示自激振荡机制,获得系统分岔特性和稳定边界。研究发现:平衡点不稳定是自激振荡的形... 详细信息

流量调节器管路系统是液氧煤油发动机中的重要模块,通过探究该系统的稳定性特征,为减小参数振荡的改进措施提供方向。通过非线性与小偏差线性方法,揭示自激振荡机制,获得系统分岔特性和稳定边界。研究发现:平衡点不稳定是自激振荡的形成条件,系统从线性项为主导的78.81 Hz发散振荡,逐步发展为非线性主导的70.01 Hz等幅振荡。随着压差增大,系统发生了Hopf超临界分岔,稳定区域随之缩小;随着节流面积增大,系统出现了Hopf亚临界分岔,稳定区域随之扩大。减小管长与增大管径均减弱了不稳定的幅值条件,皆有利于系统稳定。调节器阻尼孔对稳定边界影响不大,减小该孔径可明显减小自激振荡幅值。调节器矩形槽高度增大可使稳定区域增大,在高度为4.5、2.5 mm时分别出现了复杂的稳定边界分支、分岔曲线拐点。流量边界下的系统稳定性取决于静态负载曲线的差率,当工作在负差率区,系统不稳定,且流量边界下系统稳定域比压力边界更大。

关键词：流量调节器自激振荡稳定性分岔特性稳定边界

Dynamics of glutamine synthetase expression in hepatic ischemiareperfusion injury: Implications for therapeutic interventions

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第8期16卷 1177-1184页

作者： Zhi-Hao Huang meng-Qi dong Feng-Yong Liu Wei-Jie Zhou State Key Laboratory of Organ Failure Research Department of General SurgeryGuangdong Provincial Key Laboratory of Precision Medicine for Gastrointestinal TumorNanfang HospitalSouthern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Interventional Radiology Senior Department of OncologyFifth Medical Center of PLA General HospitalBeijing 100853China

BACKGROUND Hepatic ischemia-reperfusion injury(IRI)poses a great challenge in liver surgery and transplantation because of oxidative stress and inflammatory *** changes in glutamine synthetase(GS)expression during hepatic IRI remain *** To investigate the dynamic expression of GS during hepatic *** Following hepatic ischemia for 1 h and reperfusion,liver tissue samples were collected at 0.5,6,and 24 hours postreperfusion for fixation,embedding,*** and eosin staining and GS staining were *** GS expression rapidly decreases in hepatocytes around the central vein after IRI,reaching its lowest point at 6 hours postreperfusion,and then gradually *** GS is highly sensitive to IRI,highlighting its potential role as an indicator of liver injury states and a target for therapeutic intervention.

关键词： Hepatic ischemia-reperfusion Glutamine synthetase Central vein Liver Injury repair

The effect of"rural cultural auditorium"on the revitalization of rural culture:A case study of villages A and B in Zhejiang Province

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

Ecological Economy 2024年第2期20卷 188-199页

作者： HAN Ji-yun LV Xiao dong meng-ke PEI Yan-fang GU Ya-qing Qianjiang College Hangzhou Normal UniversityHangzhou 310018CHINA

The construction of rural cultural auditorium is conducive to gathering local popularity,excavating history and continuing civilization,and it has become a powerful driving force for cultural revitalization in rural ***,the development of"Rural Cultural Auditorium"encountered many problems so *** the perspective of rural cultural revitalization,and under the background of the new socialist rural cultural construction in China,this paper takes the rural cultural auditorium as the *** field questionnaire survey and semi-structured interview were constructed in Village A and Village B of Zhejiang Province,.SPSS software is used to analyze the collected questionnaire *** the basis of combing related concepts and theories,it summs up the problems of"rural cultural auditorium",such as the existence of cultural auditorium,low participation rate of cultural auditorium activities,poor information communication,*** visiting and investigating,going deep into the local area,according solutions are put forward such as increasing content diversity,paying attention to publicity and increasing interaction,so as to promote the healthy and sustainable development of rural cultural *** is hoped that this paper will explore the significance of the construction of rural cultural auditorium to the revitalization of rural culture in China,and put forward ideas on how to further build rural cultural auditorium,so as to provide reference for rural cultural construction services.

关键词： rural cultural auditorium rural revitalization cultural revitalization

α-particle preformation factors in heavy and superheavy nuclei

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第4期48卷 146-158页

作者：骆松张冬萌亓林静陈勋初鹏程李小华 School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266033China National Exemplary Base for International Sci&Tech.Collaboration of Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this study,α-particle preformation factors in heavy and superheavy nuclei from ^(220)Th to ^(294)Og are *** combing experimental α decay energies and half-lives,the α-particle preformation factors P_(α) are extracted from the ratios between theoretical α decay half-lives calculated using the Two-Potential Approach (TPA)and experimental *** find that the α-particle preformation factors exhibit a noticeable odd-even staggering behavior,and unpaired nucleons inhibit α-particle ***,we find that both the α decay energy and mass number of parent nucleus exhibit considerable regularity with the extracted experimental α-particle preformation *** considering the major physical factors,we propose a local phenomenological formula with only five valid parameters for α-particle preformation factors P_(α).This analytic expression has a clear physical meaning as well as good *** an application,this analytic formula is extended to estimate the α-particle preformation factors and further predict the α decay half-lives for unknown even-even nuclei with Z=118 and 120.

关键词： αdecay half-lives preformation factors heavy and superheavy nuclei

Theoretical calculations of proton emission half-lives based on a deformed Gamow-like model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第4期48卷 107-114页

作者：张冬萌胡笑源亓林静刘宏铭李明李小华 School of Nuclear Science and Technology University of South ChinaHengyang 421001China Institute of Modern Physics Fudan UniversityShanghai 200433China National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this study,proton emission half-lives were investigated for deformed proton emitters with 53≤Z≤83based on the presented deformed Gamow-like model,where the deformation effect was included in the Coulomb *** experimental half-lives of proton emitters can be reproduced within a factor of *** comparison,the results from the universal decay law and the new Geiger-Nuttall law are also ***,the relevance of the half-lives to the angular momentum l for ^(117)La,^(121)Pr,^(135)Tb,and ^(141)Ho were analyzed,and the corresponding possible values of l were proposed:l=3,3,4,4.

关键词： proton emission half-lives deformed nuclei Gamow-like model

在线全文

学校读者我要写书评

暂无评论

急性子宫颈炎的诊断及鉴别诊断

中国实用妇科与产科杂志 2024年第7期40卷 676-679页

作者：董梦婷薛凤霞天津医科大学总医院妇产科、天津市女性生殖健康与优生重点实验室天津300052

子宫颈位于相对“有菌”的下生殖道和相对“无菌”的上生殖道之间,是上生殖道的“门户”。急性子宫颈炎较为明确的病原体为性传播病原体,即外源性病原体,包括沙眼衣原体、淋病奈瑟菌、生殖支原体等,但仍有50%的患者致病菌并不明确。阴... 详细信息

子宫颈位于相对“有菌”的下生殖道和相对“无菌”的上生殖道之间,是上生殖道的“门户”。急性子宫颈炎较为明确的病原体为性传播病原体,即外源性病原体,包括沙眼衣原体、淋病奈瑟菌、生殖支原体等,但仍有50%的患者致病菌并不明确。阴道与子宫颈位置毗邻,阴道内源性病原体上行可导致子宫颈炎。近年来研究表明,细菌性阴道病相关病原体与子宫颈炎相关。急性子宫颈炎可进一步导致盆腔炎、不孕、早产、流产、新生儿感染等,正确诊断和治疗对预防子宫颈炎远期并发症至关重要。急性子宫颈炎的诊断分为临床诊断和病原学诊断。临床诊断依据特征性体征和子宫颈、阴道分泌物显微镜下白细胞计数。随着病原体分子诊断技术的长足发展,其在子宫颈炎诊断中也表现出越来越重要的作用。文章介绍了急性子宫颈炎的诊断方法,以及各种方法的优点及局限性,并对其需要鉴别的疾病进行讨论。

关键词：急性子宫颈炎诊断鉴别诊断核酸扩增方法

Leukocyte cell-derived chemotaxin 2(LECT2)regulates liver ischemia-reperfusion injury

在线全文

学校读者我要写书评

暂无评论

Liver Research 2024年第3期8卷 165-171页

作者： meng-Qi dong Yuan Xie Zhi-Liang Tang Xue-Wen Zhao Fu-Zhen Lin Guang-Yu Zhang Zhi-Hao Huang Zhi-Min Liu Yuan Lin Feng-Yong Liu Wei-Jie Zhou State Key Laboratory of Organ Failure Research Department of General SurgeryGuangdong Provincial Key Laboratory of Precision Medicine for Gastrointestinal TumorNanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Department of Hepato-Biliary-Pancreatic and Hernia Surgery The First People's Hospital of ZhaoqingZhaoqingGuangdongChina Department of Interventional Radiology Senior Department of OncologyFifth Medical Center of PLA General HospitalBeijingChina

Background and aim Hepatic ischemia–reperfusion injury(IRI)is a significant challenge in liver transplantation,trauma,hypovolemic shock,and hepatectomy,with limited effective interventions *** study aimed to investigate the role of leukocyte cell-derived chemotaxin 2(LECT2)in hepatic IRI and assess the therapeutic potential of Lect2-short hairpin RNA(shRNA)delivered through adeno-associated virus(AAV)*** and methods This study analyzed human liver and serum samples from five patients undergoing the Pringle ***2-knockout and C57BL/6J mice were *** IRI was induced by clamping the hepatic *** included recombinant human LECT2(rLECT2)and ***2 expression levels and serum biomarkers including alanine aminotransferase(ALT),aspartate aminotransferase(AST),creatinine,and blood urea nitrogen(BUN)were *** analysis of liver necrosis and quantitative reverse-transcription polymerase chain reaction were *** Serum and liver LECT2 levels were elevated during hepatic *** LECT2 protein and mRNA levels increased post ***2-knockout mice had reduced weight loss;hepatic necrosis;and serum ALT,AST,creatinine,and BUN ***2 treatment exacerbated weight loss,hepatic necrosis,and serum biomarkers(ALT,AST,creatinine,and BUN).AAV-Lect2-shRNA treatment significantly reduced weight loss,hepatic necrosis,and serum biomarkers(ALT,AST,creatinine,and BUN),indicating therapeutic *** Elevated LECT2 levels during hepatic IRI increased liver *** knockout or shRNA-mediated knockdown of Lect2 reduced liver damage,indicating its therapeutic ***-mediated Lect2-shRNA delivery mitigated hepatic IRI,offering a potential new treatment strategy to enhance clinical outcomes for patients undergoing liver-related surgeries or trauma.

关键词： Hepatic ischemia-reperfusion injury(IRI) Leukocyte cell-derived chemotaxin 2 (LECT2) Adeno-associated virus(AAV)

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

基于雷达信号转换的多维空间声音识别技术

电声技术 2024年第6期48卷 150-152,156页

作者：孟东中国电子科技集团公司第三研究所北京100015

为增加雷达信号的识别方式,提出一种基于雷达信号转换的多维空间声音识别技术。首先,将脉冲式的雷达信号拼接为连续特征声音信号;其次,使用高斯混合模型(Gaussian Mixed Model,GMM)训练拼接后的声信号;再次,根据GMM准则将未知雷达目标... 详细信息

为增加雷达信号的识别方式,提出一种基于雷达信号转换的多维空间声音识别技术。首先,将脉冲式的雷达信号拼接为连续特征声音信号;其次,使用高斯混合模型(Gaussian Mixed Model,GMM)训练拼接后的声信号;再次,根据GMM准则将未知雷达目标转化为特征向量,并与已训练的多维特征向量做对比,得到未知声目标的最大输出概率类型;最后,进行实验分析。实验结果表明,采用基于雷达信号转换的多维空间声音识别技术可以有效识别不同类型的雷达目标,为识别雷达信号提供了一种特殊的识别特征。

关键词：雷达目标识别声目标识别多维特征空间