检索结果-南通市图书馆

Shape Model and Rotation Acceleration of(1685) Toro and(85989) 1999 JD6from Optical Observations

Research in Astronomy and Astrophysics 2022年第12期22卷 166-182页

作者： Jun Tian hai-Bin zhao Bin Li Key Laboratory of Planetary Sciences Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHeifei 230026China

The Yarkovsky-O'Keefe-Radzievskii-Paddack(YORP) effect is a net torque caused by solar radiation directly reflected and thermally re-emitted from the surface of small asteroids and is considered to be crucial in their dynamical evolution. By long-term photometric observations of selected near-Earth asteroids, it is hoped to enlarge asteroid samples with a detected YORP effect to facilitate the development of a theoretical framework. Archived light-curve data are collected and photometric observations are made for(1685) Toro and(85989) 1999 JD6,which enables measurement of their YORP effect by inverting the light curve to fit observations from a convex shape model. For(1685) Toro, a YORP acceleration υ =(3.2 ± 0.3) × 10^(-9)rad · day^(-2)(1σ error) is updated,which is consistent with previous YORP detection based on different light-curve data;for(85989) 1999 JD6, it is determined that the sidereal period is 7.667 749 ± 0.000009 hr, the rotation pole direction is located atλ = 232° ± 2°, β =-59° ± 1°, the acceleration is detected to be υ =(2.4 ± 0.3) × 10^(-8)rad · day^(-2)(1σ error) and in addition to obtaining an excellent agreement between the observations and model. YORP should produce both spin-up and spin-down cases. However, including(85989) 1999 JD6, the dω/dt values of 11 near-Earth asteroids are positive totally, which suggests that there is either a bias in the sample of YORP detections or a real feature needs to be explained.

关键词： methods:data analysis methods:observational techniques:photometric minor planets asteroids:individual((1685)Toro (85989)1999 JD6)

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

Elastic Buckling of Bionic Cylindrical Shells Based on Bamboo

引用

Journal of Bionic Engineering 2008年第3期5卷 231-238页

作者： Jian-feng Ma Wu-yi Chen Ling zhao Da-hai zhao School of Mechanical Engineering and Automation Beijing University of Aeronautics and Astronautics Beijing 100083 P. R. China Shenyang Aircraft Design Institute Shenyang 110035 P. R. China

High load-bearing efficiency is one of the advantages of biological structures after the evolution of billions of years. Biomimicking from nature may offer the potential for lightweight design. In the viewpoint ofrnechanics properties, the culm of bamboo comprises of two types of cells and the number of the vascular bundles takes a gradient of distribution. A three-point bending test was carried out to measure the elastic modulus. Results show that the elastic modulus of bamboo decreases gradually from the periphery towards the centre. Based on the structural characteristics of bamboo, a bionic cylindrical structure was designed to mimic the gradient distribution of vascular bundles and parenchyma cells. The buckling resistance of the bionic structure was compared with that of a traditional shell of equal mass under axial pressure by finite element simulations. Results show that the load-bearing capacity of bionic shell is increased by 124.8%. The buckling mode of bionic structure is global buckling while that of the conventional shell is local buckling.

关键词： bionic design bamboo culm thin-walled cylindrical structure buckling load-carrying efficiency

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

TGF-β1和Collagen-Ⅲ在牦牛感染细粒棘球蚴肝纤维化中的表达

引用

动物医学进展 2024年第4期45卷 45-50页

作者：陈欣怡严得刚梁宏李菊英加央次仁王登云赵海龙唐文强青海大学医学院基础医学部青海西宁810001 青海省大通回族土族自治县人民医院青海大通810100 西藏那曲聂荣县农牧业科学技术服务站西藏那曲852000 西藏自治区农牧科学院畜牧兽医研究所西藏拉萨850000

研究转化生长因子β1(TGF-β1)、Ⅲ型胶原(Collagen-Ⅲ)在牦牛感染细粒棘球蚴导致肝纤维化中的表达及其意义。收集西藏地区40例细粒棘球蚴感染的牦牛肝组织和血清样本,同时收集未感染的肝组织和血清进行对照。采用苏木素-伊红(HE)染色... 详细信息

研究转化生长因子β1(TGF-β1)、Ⅲ型胶原(Collagen-Ⅲ)在牦牛感染细粒棘球蚴导致肝纤维化中的表达及其意义。收集西藏地区40例细粒棘球蚴感染的牦牛肝组织和血清样本,同时收集未感染的肝组织和血清进行对照。采用苏木素-伊红(HE)染色法和天狼猩红染色法观察牦牛肝脏病理变化和肝纤维化程度;酶联免疫吸附试验(ELISA)和免疫组化法(IHA)分别检测肝组织和血清中TGF-β1、Collagen-Ⅲ的表达水平及分布;RT-PCR检测肝细胞内TGF-β1和Collagen-Ⅲ基因mRNA的相对表达水平。HE染色和天狼猩红染色结果显示,与未感染细粒棘球蚴病牦牛肝组织相比,感染棘球蚴周围的肝组织肝界板细胞破坏,呈虫蚀状,感染肝组织外围纤维化,细粒棘球蚴寄生的牦牛肝脏组织引起组织增生,纤维化;ELISA结果显示感染细粒棘球蚴牦牛血清样中细胞因子TGF-β1、Collagen-Ⅲ的含量明显超过未感染组(P<0.05),且免疫组化的结果显示它们的表达主要存在于细胞基质中;RT-PCR显示细粒棘球蚴感染肝组织中TGF-β1、Collagen-Ⅲ的mRNA相对表达量超出未感染组(P<0.05)。结果表明,细粒棘球蚴感染期间TGF-β1、Collagen-Ⅲ在细粒棘球蚴感染引起的肝纤维化中起重要作用。

关键词：转化生长因子β1 Ⅲ型胶原细粒棘球蚴病肝纤维化

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

SnO_2-Decorated Graphene/Polyaniline Nanocomposite for a High-Performance Supercapacitor Electrode

引用

Journal of Materials Science & Technology 2015年第11期31卷 1101-1107页

作者： Guo Chen Qiu-Feng Lü hai-Bo zhao College of Materials Science and Engineering Fuzhou University

An SnO2-decorated graphene/polyaniline （GSP） nanocomposite with homogeneous structure was prepared and adopted to achieve high electrochemical performance for supercapacitor electrode. Graphene sheets were decorated with tin dioxide （SnO2） particles, which effectively hinder the restacking of graphene nanosheets, and then were used as substrates for an in-situ polymerization of aniline monomers. The GSP nanocomposite was characterized by field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared, UV-Visible and X-ray photoelectron spectroscopy. The results revealed that polyaniline nanorods were orderly and vertically aligned on the SnO2-decorated graphene nanosheets via π-π stacking effect between basal planes of graphene nanosheets and phenyl group of polyaniline. The GSP nanocomposite exhibited an excellent specific capacitance of 429 F g^-1 at a current density of 1 A g^-1, excellent cycling stability and rate capability, which suggested a promising application for supercapacitor.

关键词： Supercapacitor Graphene Nanocomposite Tin dioxide Polyaniline

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

Explicit frequency equations of free vibration of a nonlocal Timoshenko beam with surface effects

引用

Acta Mechanica Sinica 2018年第4期34卷 676-688页

作者： hai-Sheng zhao Yao Zhang Seng-Tjhen Lie School of Civil and Environmental Engineering Nanyang Technological University

Considerations of nonlocal elasticity and surface effects in micro-and nanoscale beams are both important for the accurate prediction of natural frequency. In this study, the governing equation of a nonlocal Timoshenko beam with surface effects is established by taking into account three types of boundary conditions： hinged–hinged, clamped–clamped and clamped–hinged ends. For a hinged–hinged beam, an exact and explicit natural frequency equation is obtained. However, for clamped–clamped and clamped–hinged beams, the solutions of corresponding frequency equations must be determined numerically due to their transcendental nature. Hence, the Fredholm integral equation approach coupled with a curve fitting method is employed to derive the approximate fundamental frequency equations, which can predict the frequency values with high accuracy. In short,explicit frequency equations of the Timoshenko beam for three types of boundary conditions are proposed to exhibit directly the dependence of the natural frequency on the nonlocal elasticity, surface elasticity, residual surface stress, shear deformation and rotatory inertia, avoiding the complicated numerical computation.

关键词： Fredholm integral equation Natural frequency Nonlocal elasticity Surface effects Timoshenko beam

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

Curcumin alleviates experimental colitis via a potential mechanism involving memory B cells and Bcl-6-Syk-BLNK signaling

引用

World Journal of Gastroenterology 2022年第40期28卷 5865-5880页

作者： Si-Yi Wei Tian-Tian Wu Jia-Qi Huang Zeng-Ping Kang Meng-Xue Wang You-Bao Zhong Wei Ge Bu-Gao Zhou hai-Mei zhao hai-Yan Wang Duan-Yong Liu Department of Postgraduate Jiangxi University of Chinese MedicineNanchang 330004Jiangxi ProvinceChina Laboratory Animal Research Center for Science and Technology Jiangxi University of Chinese MedicineNanchang 330004Jiangxi ProvinceChina Affiliated Hospital Jiangxi University of Chinese MedicineNanchang 330004Jiangxi ProvinceChina Formula-Pattern Research Center Jiangxi University of Chinese MedicineNanchang 330004Jiangxi ProvinceChina

BACKGROUND Immune dysfunction is the crucial cause in the pathogenesis of inflammatory bowel disease(IBD),which is mainly related to lymphocytes(T or B cells,including memory B cells),mast cells,activated neutrophils,and *** the precursor of B cells,the activation of memory B cells can trigger and differentiate B cells to produce a giant variety of inducible B cells and tolerant B cells,whose dysfunction can easily lead to autoimmune diseases,including *** To investigate whether or not curcumin(Cur)can alleviate experimental colitis by regulating memory B cells and Bcl-6-Syk-BLNK *** Colitis was induced in mice with a dextran sulphate sodium(DSS)solution in drinking *** mice were given Cur(100 mg/kg/d)orally for 14 consecutive *** colonic weight,colonic length,intestinal weight index,occult blood scores,and histological scores of mice were examined to evaluate the curative *** levels of memory B cells in peripheral blood of mice were measured by flow cytometry,and IL-1β,IL-6,IL-10,IL-7A,and TNF-αexpression in colonic tissue homogenates were analyzed by enzyme-linked immunosorbent *** blot was used to measure the expression of Bcl-6,BLNK,Syk,and other signaling pathway related *** After Cur treatment for 14 d,the body weight,colonic weight,colonic length,colonic weight index,and colonic pathological injury of mice with colitis were *** secretion of IL-1β,IL-6,TNF-α,and IL-7A was statistically decreased,while the IL-35 and IL-10 levels were considerably *** of memory B cell subsets in colitis mice was confirmed by a remarkable reduction in the expression of IgM,IgG,IgA,FCRL5,CD103,FasL,PD-1,CD38,and CXCR3 on the surface of CD19^(+)CD27^(+)B cells,while the number of CD19^(+)CD27^(+)IL-10^(+)and CD19^(+)CD27^(+)Tim-3^(+)B cells increased *** addition,Cur significantly inhibited the protein levels of Syk,p-Syk,Bcl-6,and CIN85,and increased BLNK and p-BLNK

关键词： Curcumin Experimental colitis Memory B cell Bcl-6 BLNK

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

《餐饮油烟净化器用高压电源》解读

引用

中国环保产业 2024年第5期 40-43页

作者：于志强李亚飞赵海山银星宇张力上海市计量测试技术研究院上海200233

餐饮油烟净化器用高压电源作为餐饮油烟净化器的动力来源和控制系统,广泛应用于各大餐饮单位的油烟净化设备中。文章针对团体标准《餐饮油烟净化器用高压电源》(T/CAEPI 80-2024),深入分析其背景、意义以及作用,重点分析了标准的关键技... 详细信息

餐饮油烟净化器用高压电源作为餐饮油烟净化器的动力来源和控制系统,广泛应用于各大餐饮单位的油烟净化设备中。文章针对团体标准《餐饮油烟净化器用高压电源》(T/CAEPI 80-2024),深入分析其背景、意义以及作用,重点分析了标准的关键技术内容及参数要求,以期能对该标准的理解、应用及推广起到积极推动作用。

关键词：高压电源标准解读

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

原子荧光法和电感耦合等离子体质谱法测定地表水中砷硒锑方法比对研究

引用

广州化工 2024年第12期52卷 95-97页

作者：李志林杨春涛普学伟赵海茜鲁瑞梅云南省生态环境厅驻玉溪市生态环境监测站云南玉溪653100

建立了原子荧光光谱法与电感耦合等离子体质谱法测定地表水中砷、硒、锑的方法。在优化了的仪器和实验条件下,比较了两者的线性关系、检出限、准确度、精密度。结果表明,两种方法相关系数0.9991~0.9999,检出限为0.23~0.59μg/L,样品加... 详细信息

建立了原子荧光光谱法与电感耦合等离子体质谱法测定地表水中砷、硒、锑的方法。在优化了的仪器和实验条件下,比较了两者的线性关系、检出限、准确度、精密度。结果表明,两种方法相关系数0.9991~0.9999,检出限为0.23~0.59μg/L,样品加标回收率为92.4%~107%,RSD为0.9%~6.9%,利用国家标准物质验证两种方法的可靠性与准确,测定值均在标准值允许范围内,两种方法准确度高、精密度好、灵敏度高,两种方都可以有效监测地表水中的砷、硒、锑。

关键词：原子荧光法电感耦合等离子体质谱法砷、硒、锑方法比对

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

Text mining and data analysis identify potential drugs and pathways for polycystic ovary syndrome treatment

引用

生殖与发育医学(英文) 2024年第1期08卷 32-38页

作者： Yuan Xiao-Jing Wang Yan Yang hai-Yan zhao Bin Medical Reproductive Center People’s Hospital of Jiuquan City 3. Jiuquan 735000 4. China Department of Gynecological Oncology The Fourth Affiliated Hospital of Guangxi Medical University 7. Liuzhou 545000 8. Xiamen Health and Medical Big Data Center 9. Xiamen 361001

Objective: Polycystic ovarian syndrome (PCOS) is a common endocrine disorder affecting women of reproductive age. This study aimed to use text mining and microarray data analysis to identify drugs that target genes and potential pathways associated with ***: We extracted a common set of genes associated with PCOS using text mining and the microarray dataset GSE48301. Next, we performed Gene Ontology and Kyoto Encyclopedia of Genes and Genomes analyses of these genes, as well as protein–protein interaction (PPI) network analysis. Additionally, we used MCODE and cytoHubba to cluster significant common genes in the PPI network and performed gene–drug interaction analyses to identify potential drugs for further investigation. Finally, we annotated pathways associated with the genes ***: Text mining and microarray analysis yielded 696 text mining genes (TMGs) and 2804 differentially expressed genes (DEGs). Among these, a set of 77 genes was found in both TMGs and DEGs. Interestingly, 67 of these genes participated in constructing the PPI network. Seven common hub genes were selected using the MCODE and CytoHubba methods. Finally, five out of seven genes were targeted by 15 existing ***: Four genes (FASLG, IL13, IL17A, andIL2RA), which are mainly related to the cytokine–cytokine receptor interaction pathway, could be prioritized as targets for PCOS.

关键词： Text mining Differentially expressed genes Polycystic ovary syndrome Drug discovery

来源：

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

Extracting Oscillation Frequencies in Spontaneous Emission Rate of an Atom Between Two Mirrors

引用

Communications in Theoretical Physics 2007年第1期47卷 127-130页

作者： zhao hai-Jun DU Meng-Li Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080 China

为在有在二面平行镜子之间夹的折射索引 n 的媒介的一个原子，我们基于费密为自发的排放率导出一个分析公式“ sgolden 统治。摆动不在这个公式是透明的。由当保持系统配置 Gxed 时，在放大测量系统尺寸的变量上执行 Fouriertransform... 详细信息

为在有在二面平行镜子之间夹的折射索引 n 的媒介的一个原子，我们基于费密为自发的排放率导出一个分析公式“ sgolden 统治。摆动不在这个公式是透明的。由当保持系统配置 Gxed 时，在放大测量系统尺寸的变量上执行 Fouriertransform，我们在这个系统提取了许多摆动的频率。我们证明这些摆动对应于射出的光子靠近轨道的走开从并且回到射出的原子，

关键词：原子物理学自发发射率振动频率镜子折射

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：