检索结果-南通市图书馆

Acoustic emission responses and damage estimation of coal with carbon fi ber-reinforced polymer confinement under uniaxial compression

引用

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第12期16卷 5077-5094页

作者： Xia, Ze Yao, Qiangling Li, Xuehua Yu, Linli Li, Yinghu Shan, Changhao yan, lun China Univ Min & Technol State Key Lab Coal Resources & Safe Min CUMT Xuzhou 221116 Peoples R China China Univ Min & Technol Sch Mines Xuzhou 221116 Peoples R China China Univ Min & Technol State Key Lab Geomech & Deep Underground Engn Xuzhou 221116 Peoples R China

Fiber-reinforced polymer (FRP) wrapping is a potential technique for coal pillar reinforcement. In this study, an acoustic emission (AE) technique was employed to monitor coal specimens with carbon FRP (CFRP) jackets during uniaxial compression, which addressed the inability to observe the cracks inside the FRP-reinforced coal pillars by conventional field inspection techniques. The spatiotemporal fractal evolution of the cumulated AE events during loading was investigated based on fractal theory. The results indicated that the AE response and fractal features of the coal specimens were closely related to their damage evolution, with CFRP exerting a significant influence. In particular, during the unstable crack development stage, the evolutionary patterns of the AE count and energy curves of the CFRPconfined specimens underwent a transformation from the slight shock-major shock type to the slight shock-sub-major shock-slight shock-major shock type, in contrast to the unconfined coal specimens. The AE b-values decreased to a minimum and then increased marginally. The AE spatial fractal dimension increased rapidly, whereas the AE temporal fractal dimension fluctuated significantly during the accumulation and release of strain energy. Ultimately, based on the AE count and AE energy evolution, a damage factor was proposed for the coal samples with CFRP jackets. Furthermore, a damage constitutive model was established, considering the CFRP jacket and the compaction characteristics of the coal. This model provides an effective description of the stress-strain relationship of coal specimens with CFRP jackets. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/ 4.0/).

关键词： Carbon fiber-reinforced polymer (CFRP)-confined coal Uniaxial compression Acoustic emission (AE) b-value Fractal dimension

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

Effects of the severity and timing of basal leaf removal on the amino acids profiles of Sauvignon Blanc grapes and wines

引用

Journal of Integrative Agriculture 2019年第9期18卷 2052-2062页

作者： YUE Xiao-feng JU yan-lun TANG Zi-zhu ZHAO Ya-meng JIAO Xu-liang ZHANG Zhen-wen College of Enology Northwest A&F UniversityYangling 712100P.R.China Sino-French Joint Venture Dynasty Winery Ltd. Tianjin 300402P.R.China Shaanxi Engineering Research Center for Viti-Viniculture Yangling 712100P.R.China

The effects of the severity and timing of leaf removal(LR)on the amino acids of Sauvignon Blanc grapes and wines were studied during the 2017 growing ***-performance liquid chromatography(HPLC)was used to analyze the amino acids profiles of grape berries and *** basal leaves were removed at three time points(40,56 and 72 days after flowering,named LR40,LR56 and LR72,respectively)at two severity levels(one at which the first,third,and fifth basal leaves of each shoot were removed(50%level);and another at which the first six basal leaves were removed(100%level)).The results showed that leaf removal had little impact on total soluble solids(°Brix),titratable acidity,pH or berry *** LR72-50%treated grapes had higher berry weight,titratable acidity and°Brix than those of the other *** highest concentrations of total amino acids and of total amino acids except proline were detected in LR72-50%treated grapes(2 952.58 and 2 764.36 mg L^-1,respectively);the lowest were detected in LR72-100%treated grapes(2 172.82 and 2 038.71 mg L^-1,respectively).LR72-50%treatment significantly promoted the synthesis of aspartic acid,serine,arginine,alanine,aminobutyric acid and proline at both severity levels for grapes,the concentrations of all of these amino acids were increased relative to the control *** LR72-50%,LR40-100%and LR72-100%treated wines had higher total amino acids concentrations and higher concentrations of some individual amino acids,such as arginine,alanine and serine,than did the control *** all the amino acids studied,glycine,tyrosine,cysteine,methionine and lysine were not significantly influenced by the timing or severity basal defoliation in grapes and *** present study reveals the effects of the timing and severity of leaf removal on the amino acids profiles of grapes and wines.

关键词： amino acid grape leaf removal Sauvignon Blanc wine

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

Pancreatic giant malignancy simulating a gastrointestinal stromal tumor

引用

Hepatobiliary & Pancreatic Diseases International 2024年第4期23卷 431-433页

作者： Ben-Jie Liu Chen-Hui Jin yan-lun Guo Zhi-Gang Ke Jun-Jun Huang Lin-Ping Cao Department of Hepatobiliary Surgery Department of General SurgeryPujiang Branch of the First Affiliated HospitalZhejiang University School of MedicineJinhua 322200China Department of Pathology Pujiang Branch of the First Affiliated HospitalZhejiang University School of MedicineJinhua 322200China Department of Hepatobiliary and Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Pancreatic acinar cell carcinoma(PACC)is a rare malignant tumor of pancreatic epithelial cells,which produces pancreatic exocrine *** originates from acinar cells and terminal branches of the pancreatic ducts in the exocrine tissue of the *** accounts for 1%−2%of pancreatic exocrine tumors[1].Herein,we present an elderly woman with PACC who recovered after effective laparoscopic *** tumor was located on the left side of the abdomen;imaging suggested that it was a gastrointestinal stromal tumor of the gastric wall origin,infiltrating the tail of the pancreas and omentum,while postoperative pathology suggested PACC.

关键词： Pancreatic gastrointestinal pancreas

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

Meridian Tropism of Polygoni Avicularis Herba by Tissue Distribution of Avicularin in Rats

引用

Chinese Herbal Medicines 2012年第3期4卷 201-204页

作者： Fu-quan XU[a] Hua-shi GUAN[b] Yuan-yuan FENG[c] Bin-lun yan[a] Jiangsu Key Laboratory of Marine Biotechnology Huaihai Institute of TechnologyLianyungang 222005China

Objective To observe the meridian tropism of Polygoni Avicularis Herba by tissue distribution of avicularin in rats. Methods Tissue distribution of avicularin in rat following a single iv administration was appointed and observed. HPLC method was established and validated for the determination of avicularin in rat tissues. Results Kidney and bladder were the most important target tissue of avicularin. Conclusion HPLC method is successfully applied to tissues distribution study of avicularin after iv administration to rats, and the results explain Polygoni Avicularis Herba on bladder tropism reasonably.

关键词： avicularin HPLC meridian tropism Polygoni Avicularis Herba tissues distribution

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 distributed spatial computing prototype system in grid environment

引用

Science China(Technological Sciences) 2010年第S1期53卷 25-32页

作者： WU lun,yan MengLong,GAO Yong,yanG ZhenZhen,ZHAO Yong & CHEN Bin Institute of Remote Sensing and Geographic Information System,Peking University,Beijing 100871,China 1. Institute of Remote Sensing and Geographic Information System Peking University Beijing 100871 China

Digital Earth has been a hot topic and research trend since it was proposed,and Digital China has drawn much attention in *** a key technique to implement Digital China,grid is an excellent and promising concept to construct a dynamic,inter-domain and distributed computing *** is appropriate to process geographic information across dispersed computing resources in networks effectively and cooperatively.A distributed spatial computing prototype system is designed and implemented with the Globus *** important aspects are discussed in *** architecture is proposed according to the characteristics of grid firstly,and then the spatial resource query and access interfaces are designed for heterogeneous data *** open-up hierarchical architecture for resource discovery and management is represented to detect spatial and computing resources in grid.A standard spatial job management mechanism is implemented by grid service for convenient *** addition,the control mechanism of spatial datasets access is developed based on *** prototype system utilizes the Globus Toolkit to implement a common distributed spatial computing framework,and it reveals the spatial computing ability of grid to support Digital China.

关键词： distributed geographic information processing grid computing Digital China GIS

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

Longitudinal Alterations of Local Spontaneous Brain Activity in Parkinson's Disease

引用

Neuroscience Bulletin 2017年第5期33卷 501-509页

作者： Qiaoling Zeng Xiaojun Guan Jason C.F.Law yan lun Zhujing Shen Tao Guo Min Xuan Quanquan Gu Xiaojun Xu Min Chen Minming Zhang Department of Radiology The Second Affiliated HospitalZhejiang University School of Medicine Department of Radiology Beijing Hospital

We used resting-state fMRI to evaluate longitu- dinal alterations in local spontaneous brain activity in Parkinson＇s disease （PD） over a 2-year period. Data were acquired from 23 PD patients at baseline and follow-up, and 27 age- and sex-matched normal controls. Regional homogeneity （ReHo） and voxel-based-morphometry （VBM） were used to identify differences in local sponta- neous brain activity and grey matter volume. With disease progression, we observed a progressive decrease in ReHo in the sensorimotor cortex, default-mode network, and left cerebellum, but increased ReHo in the supplementary motor area, bilateral temporal gyrus, and hippocampus. Moreover, there was a significant positive correlation between the rates of ReHo change in the left cerebellum and the rates of change in the Unified Parkinson＇s Disease Rating Scale-III scores. VBM revealed no significant differences in the grey matter volume among the three sets of acquisitions. We conclude that ReHo may be a suitable non-invasive marker of progression in PD.

关键词： Longitudinal Parkinson's disease Regionalhomogeneity ·Functional magnetic resonance imaging

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

Anti-colorectal cancer effects of tripolinolate A from Tripolium vulgare

引用

Chinese Journal of Natural Medicines 2017年第8期15卷 576-583页

作者： CHEN Lu WANG Wen-Ling SONG Teng-Fei XIE Xin YE Xue-Wei LIANG Ying HUANG Hao-Cai yan Shi-lun LIAN Xiao-Yuan ZHANG Zhi-Zhen Ocean College Zhoushan CampusZhejiang UniversityZhoushan 316021China College of Pharmaceutical Sciences Zhejiang UniversityHangzhou 310058China

Tripolinolate A(TLA) is recently identified as a new compound from a halophyte plant Tripolium vulgare and has been shown to have significant in vitro activity against the proliferation of colorectal cancer and glioma cells. This study was designed to further investigate the effects of TLA on the proliferation of human normal cells, and the apoptosis and cell cycle in colorectal cancer cells, and the growth of tumors in the colorectal cancer-bearing animals. The data obtained from this study demonstrated that: 1) TLA had much less cytotoxicity in the human normal cells than the colorectal cancer cells; 2) TLA remarkably induced apoptosis in the human colorectal cancer cells and blocked cell cycle at G2/M phase, and 3) TLA had significant anti-colorectal cancer activity in the tumor-bearing animals.

关键词： Tripolinolate A Colorectal cancer cells Apoptosis Cell cycle Anti-colorectal tumor effects

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

纳晶稀土复合氧化物Dy_(1-x)Sr_xCoO_(3-y) Ⅰ.荧光特性及其机理研究

引用

化学学报 1998年第6期56卷 589-593页

作者：魏坤贺伦燕石燕南昌大学稀土工程中心南昌330047 南昌大学食品系

研究了在紫外(UV)激发下纳晶Dy_(1-x)Sr_xCoO_(3-y)(0.0≤x≤1.0)的荧光特性及其发光机理结果表明,纳晶Dy_(1-x)Sr_xCoO_(3-y)的荧光为量子限域型光致发光,这源于纳晶的尺寸量子化效应,其发光机理力量子限域模型.Dy^(3+)的自身浓度猝灭... 详细信息

研究了在紫外(UV)激发下纳晶Dy_(1-x)Sr_xCoO_(3-y)(0.0≤x≤1.0)的荧光特性及其发光机理结果表明,纳晶Dy_(1-x)Sr_xCoO_(3-y)的荧光为量子限域型光致发光,这源于纳晶的尺寸量子化效应,其发光机理力量子限域模型.Dy^(3+)的自身浓度猝灭机理为电隅极-电四极相互作用.纳晶电偶极跃迁的振子强度为3.256×10^(-6)～41.00×10^(-6),摩尔消光系数为0.8581～10.82.

关键词：发光机理镝锶钴复合氧化物纳米晶体

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

Ramanujan模3和模5的模恒等式的推广

引用

南京邮电大学学报（自然科学版） 2014年第4期34卷 124-126页

作者：闫庆伦南京邮电大学理学院江苏南京210023

在模形式理论中,模3、模5的模等式起着核心的作用。文中主要是利用多节级数方法,借助Jacobi三重积恒等式和筛法原理,得到了Ramanujan模3和模5的模方程的推广形式。

关键词： Jacobi三重积恒等式 Ramanujan theta函数模函数方程

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

Phylogenetic relationships between purple and tea-green individuals of the blue swimming crab Portunus trituberculatus by PCR-SSCP analysis

引用

Journal of Agricultural Science and Technology 2009年第1期3卷 54-62页

作者： CHI Da-li GAO Huan SHEN Song-dong yan Bin-lun School of Life Sciences Suzhou University Suzhou 215123 China Jiangsu Key Laboratory of Marine Biotechnology Huaihai Institute of Technology Lianyungang 222005 China

Given the morphological characters of purple crabs identical with that of the tea-green ones except the body color, it is expected that the purple crabs and the tea-green ones were from the same species. In order to identify the phylogenetic relationships between them at the molecular level, we amplified and compared two conserved mitochondrial gene fragments of purple and tea-green crabs through PCR-SSCP and DNA sequencing analyses. The results showed that there was no distinct variation of DNA bands of both the CO1 and 16srRNA genes detected in polyacrylamide gels through SSCP analysis between purple and tea-green crab samples, and the following sequence analysis of color-different crab individuals presented 99.81% and 99.91% nucleotide sequence identity of the CO1 and 16srRNA genes respectively. These indicated that there was no species or subspecies differentiation between purple and tea-green crabs, meaning that they belonged to the same species, Portunus trituberculatus.

关键词： 16srRNA body-color COI PCR Portunus trituberculatus SSCP

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

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：