检索结果-南通市图书馆

Prevalence of Helicobacter pylori infection in Chinese military personnel:A cross-sectional,multicenter-based study

World Journal of Gastroenterology 2025年第3期31卷 42-49页

作者： Han-Chen Min Chun-Yan Zhang Fang-Yu Wang Xiao-Hui Yu Shan-Hong Tang Hong-Wu Zhu Ya-gang zhao Ji-Luo Liu Jian Wang Jing-Han Guo Xiao-Mei Zhang Yun-Sheng Yang Chinese People’s Liberation Army Medical School Chinese People’s Liberation Army General HospitalBeijing 100853China Department of Gastroenterology and Hepatology The First Medical CenterChinese People’s Liberation Army General HospitalBeijing 100853China Sixth Healthcare Department The Second Medical CenterChinese People’s Liberation Army General HospitalBeijing 100853China Department of Gastroenterology The 940th Hospital of Joint Logistic Support Force of Chinese People’s Liberation ArmyLanzhou 730050Gansu ProvinceChina Department of Gastroenterology General Hospital of Western Theater CommandChengdu 610011Sichuan ProvinceChina Department of Gastroenterology General Hospital of Southern Theater CommandGuangzhou 510010Guangdong ProvinceChina Department of Epidemiology Naval Medical UniversityShanghai 200433China School of Medicine Nankai UniversityTianjin 300071China National Clinical Research Center for Geriatric Diseases Chinese People’s Liberation Army General HospitalBeijing 100853China

BACKGROUND Helicobacter pylori(***)infection is a prevalent disease encountered in military internal medicine and recognized as the main cause of dyspepsia,gastritis,and peptic ulcer,which are common diseases in military *** guidelines in China state all patients with evidence of active infection with *** are offered ***,the prevalence of *** infection and its regional distribution in the military population remain unclear,which hinders effective prevention and treatment *** the prevalence of *** infection in the military population will aid in the development of customized strategies to better manage this infectious *** To investigate the prevalence of *** infection in the Chinese military population in different geographic *** This multicenter,retrospective study included 22421 individuals from five tertiary hospitals located in north,east,southwest,and northwest cities of *** infection was identified using the urea breath test,which had been performed between January 2020 and December *** Of the 22421 military service members,7416(33.1%)were urea breath *** highest prevalence of *** was in the 30-39 years age group for military personnel,with an infection rate of 34.9%.The majority of infected subjects were younger than 40-years-old,accounting for 70.4%of the infected *** individuals serviced in Lanzhou and Chengdu showed a higher infection prevalence than those in Beijing,Nanjing,and Guangzhou,with prevalence rates of 44.3%,37.9%,29.0%,31.1%,and 32.3%,*** *** infection remains a common infectious disease among military personnel in China and has a relatively high prevalence rate in northwest China.

关键词： Helicobacter pylori Prevalence Military personnel Urea breath test Multicenter study

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

Low-α metal-rich stars with sausage kinematics in the LAMOST survey: Are they from the Gaia-Sausage-Enceladus galaxy?

引用

Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 14-26页

作者： gang zhao Yuqin Chen CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 101408China

We search for metal-rich Sausage-kinematic(MRSK)stars with[Fe/H]>−0.8 and−100 详细信息

We search for metal-rich Sausage-kinematic(MRSK)stars with[Fe/H]>−0.8 and−100

关键词： Galactic halo spiral arms and Galactic disk chemical composition and chemical evolution kinematics and dynamics rotation

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

Mechanism of fracture toughness property of aging-hardening eutectic Al-Si alloys

引用

Rare Metals 2023年第8期42卷 2795-2800页

作者： Tao Hong gang zhao Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Xinjiang Sunrise Powder New Materials Co. LtdUrumchi 830012China

The micro structures and fracture toughness properties of the aged Al-12.5Si-0.7Mg alloy plate were studied by transmission electron microscopy(TEM),optical microscopy(OM),tensile,and fracture toughness(the fracture toughness value,K_(IC))*** mechanism of fracture toughness properties of the alloys was discussed for different sizes of silicon particle and aging *** results show that the refined and rounded silicon particles will improve the fracture toughness property of the ***,the silicon particles size is no longer the main factor to affect the fracture toughness property when the silicon particles are small and they have no sharp *** morphology and distribution of the precipitates play an important role in the fracture toughness property of the aged *** fracture toughness decreases gradually as the aging time increases.

关键词： Eutectic Al-Si alloy Silicon particle Fracture toughness(K_(IC)) Plate

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

The Harmonic Bergman Kernels for Punctured Domains

引用

Acta Mathematica Sinica,English Series 2014年第11期30卷 1977-1988页

作者： Zhen gang zhao Department of Mathematics Capital Normal University

We obtain the explicit formulae for the harmonic Bergman kernels of Bn／{0} and Rn／Bn and study the connection between harmonic Bergman kernel and weighted harmonic Bergman *** also get the explicit formula for the w... 详细信息

关键词： Harmonic Bergman kernel harmonic Bergman weighted harmonic Bergman kernel

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

Almost perfect sequences based on cyclic difference sets

引用

Journal of Systems Engineering and Electronics 2007年第1期18卷 155-159页

作者： Chen gang zhao Zhengyu Ionosphere Lab Wuhan Univ. Wuhan 430070 E R. China

The perfect sequences are so ideal that all out-of-phase autocorrelation coefficients are zero, and if the sequences are used as the coding modulating signal for the phase-modulated radar, there will be no interference of side lobes theoretically. However, it has been proved that there are no binary perfect sequences of period 4 〈 n ≤ 12100. Hence, the almost perfect sequences with all out-of-phase autocorrelation coefficients as zero except one are of great practice in engineering. Currently, the cyclic difference set is one of most effective tools to analyze the binary sequences with perfect periodic autocorrelation function. In this article, two characteristic formulas corresponding to the autocorrelation and symmetric structure of almost perfect sequences are calculated respectively. All almost perfect sequences with period n, which is a multiple of 4, can be figured out by the two formulas. Several almost perfect sequences with different periods have been hunted by the program based on the two formulas and then applied to the simulation program and practical application for ionospheric sounding.

关键词： Perfect sequence Almost perfect sequence Cyclic difference sets Autocorrelation coefficients Side lobes Ionospheric sounding

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

A PCA approach to stellar abundances I. testing of the method validity

引用

Research in Astronomy and Astrophysics 2019年第10期19卷 27-34页

作者： Wei He gang zhao National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 100049 China

The derivation of element abundances of stars is a key step in detailed spectroscopic analysis. A spectroscopic method may suffer from errors associated with model simplifications. We have developed a new method of deriving the various element abundances of stars based on the calibration established from a group of standard stars. We perform principal component analysis (PCA) on a homogeneous library of stellar spectra, and then use machine learning to calibrate the relationship between principal components and element abundances. By testing with spectral libraries S4N and MILES, we find that our procedure provides good consistency when spectra from a homogeneous set of observations are used, and it could be expanded to stars with quite a wide range of stellar parameters, with both dwarfs and giants. Moreover, we discuss the four key factors that have a significant impact on the results of derived element abundances, including the resolution of the spectra, wavelength range, the signal-to-noise ratio (S/N) of spectra and the number of principal components adopted.

关键词： stars-stars abundances-techniques spectroscopic-methods data analysis

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

The identification of comets in Chinese historical records

引用

Science China(Physics,Mechanics & Astronomy) 2011年第1期54卷 150-155页

作者： ZHANG Lan zhao gang National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

The historical records of astronomical phenomena may play a significant role in comet *** an accurate result is based on many factors,of which the calculation of orbital elements is the most *** paper presents a "Cross Reference" method in which the perturbation of Jupiter is the only considered factor used to attempt an efficient way of comet identification with ancient Chinese historical *** this method,the records before and after the calculated result from orbital determination within the error range are compared with the historical records to find the correlated perihelion time,and then,with five other orbital elements at the perihelion time,the ephemeris is *** the calculated ephemeris matches the historical records,it is concluded that the comet determined by orbital calculation is the same as the one recorded in *** this method,three comets with four historical records have already been found.

关键词： celestial mechanics methods:numerical comets:general

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

Planet host stars in open clusters

引用

Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 96-101页

作者： YANG XiaoLing CHEN YuQin zhao gang Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

We have compiled a list of all planet host star candidates reported in the literature,which are likely to be cluster members,and we checked their memberships by the spatial location,radial velocity,proper motion and photometric *** found that only six stars,BD-13 2130,HD 28305,Kepler-66,Kepler-67,Pr0201 and Pr0211,are planet orbiting stars in open clusters to *** stars,HD 70573 and HD 89744,belong to moving groups and one star,TYC 8975-2606-1,may not be a planet host star,while three stars,HD 16175,HD 46375 and HD 108874 are not members of open *** note that all these six planetary systems in the stellar cluster environment are younger than^1 Gyr,which might indicate that the planetary system in open cluster can not survive for a long time,and we speculate that close stellar encounters between member stars in open cluster can potentially destroy,or at least strongly affect,the presence of planetary systems.

关键词： extrasolar planets planetary survival open cluster

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

A Formal Synthesis of Iridoid 9-Deoxygelsemide

引用

Chinese Journal of Chemistry 2013年第1期31卷 18-22页

作者： Yang Liu gang zhao Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A formal total synthesis of iridoid 9-deoxygelsemide has been accomplished. Our approach features the use of （S）-carvone as starting material, Favorskii rearrangement to construct the functionalized cyclopentane core, Chugeav elimination to introduce the endocyclic double bond, and the ring-opening reaction of epoxide to build the second five-membered ring.

关键词： iridoid 9-deoxygelsemide Favorskii rearrangement Chugeav elimination

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

Transient expression of organophosphorus hydrolase to enhance the degrading activity of tomato fruit on coumaphos

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第2期10卷 142-146页

作者： Jie-hong zhao De-gang zhao MOE Key Laboratory of Green Pesticide and Agricultural Bioengineering Guizhou Key Laboratory of Agricultural Bioengineering Guizhou University Guiyang 550025 China

We constructed an expression cassette of the organophosphorus pesticide degrading （opal） gene under the control of the E8 promoter. Then opd was transformed into tomato fruit using an agroinfiltration transient expression system. β-Glucuronidase （GUS） staining, reverse transcription-polymerase chain reaction （RT-PCR）, wavelength scanning, and fluorescent reaction were performed to examine the expression of the opd gene and the hydrolysis activity on coumaphos of organo- phosphorus hydrolase （OPH） in tomato fruit. The results show that the agroinfiltrated tomato fruit-expressed OPH had the maximum hydrolysis activity of about 11.59 Uhng total soluble protein. These results will allow us to focus on breeding transgenic plants that could not only enhance the degrading capability of fruit and but also hold no negative effects on pest control when spraying organophosphorus pesticides onto the seedlings in fields.

关键词： Bioremediation E8 promoter Organophosphorus hydrolase (OPH) Transient expression

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：