检索结果-南通市图书馆

Intestinal Microbial Community Differs between Acute Pancreatitis Patients and Healthy Volunteers

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

Biomedical and Environmental Sciences 2018年第1期31卷 81-86页

作者： zhang xi mei zhang Zheng Yu zhang Chen Huan WU Jing WANG You xin zhang Guo xin Department of Gastroenterology Nanjing First Hospital Nanjing Medical University Nanjing 210006 Jiangsu China School of Public Health Medical College of Soochow University Suzhou 215000 Jiangsu China Ruike-donghua Translational Medicine Research Center Co. Beijing 100176 China Beijing Municipal Key Laboratory of Clinical Epidemiology School of Public Health Capital Medical University Beijing 100069 China Department of Gastroenterology The First Affliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu China

A case control study including 45 acute pancreatitis and 44 healthy volunteers was performed to investigate the association between intestinal microbial community and acute pancreatitis. High-throughput 16S r RNA gene amplicon sequencing was used to profile the microbiological composition of the samples. In total, 27 microbial phyla were detected and the samples of pancreatitis patients contained fewer phyla. Samples from acute pancreatitis patients contained more Bacteroidetes and Proteobacteria and fewer Firmicutes and Actinobacteria than those from healthy volunteers. PCo A analyses distinguished the fecal microbial communities of acute pancreatitis patients from those of healthy volunteers. The intestinal microbes of acute pancreatitis patients are different from those of healthy volunteers. Modulation of the intestinal microbiome may serve as an alternative strategy for treating acute pancreatitis.

关键词： Intestinal Microbial Community Differs Acute Pancreatitis Patients

Preparation of Low Ratio Magnesium Ccement by Acid Leaching Treatment of Boron Mud

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 120-129页

作者： YANG mei zhang Mingzhe CHEN Hao School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110168China School of Physical Science and Technology Shenyang Normal UniversityShenyang 110168China

The effects of liquid-solid ratio and reaction time on the leaching rate of magnesium at room temperature were investigated,as well as the effects of the molar ratio of MgO/MgCl_(2),the amount of water added,and the amount of acid-impregnated slag dosed on the compressive strength and water resistance of *** results showed that the magnesium element in the boron mud could be maximally leached under the conditions of 1:1 concentration of hydrochloric acid at room temperature,liquid-solid ratio of 2.5 mL·g^(-1),and reaction time of 5 h,and the main products were amorphous SiO_(2) as well as a small amount of magnesium olivine which had not been completely *** LR-MOC prepared using the acid-soaked mixture could reach a softening coefficient of 0.85 for 28 d of water immersion when the molar ratio of MgO/MgCl_(2) was 2.2,the amount of water added was 0 g,and the acid-soaked slag dosing was 40 wt%,which also led to an appreciable late-strength,with an increase of 19.4%in compressive strength at 28 d compared to that at 7 *** previous studies,LR-MOC prepared in this way has a final strength phase that is not the more easily hydrolysed 3-phase but the lath-like *** this phenomenon,we analyzed the mechanism and found that,during the acid leaching process,a part of amorphous SiO_(2) dissolved in the acid leaching solution formed a silica sol,in which Mg^(2+)played a bridging role to make the silica sol more *** the addition and hydrolysis of MgO,the silica sol gel coagulation slows down,providing a capping layer to inhibit the hydrolysis of the 5-phase crystals and providing some strength after *** amorphous SiO_(2) in the other part of the acid-impregnated slag generated M-S-H gel with Mg^(2+)and OH-,which synergised with the dense structure composed of interlocking crystals to improve the water resistance of LR-MOC.

关键词： boron mud magnesium chloride-oxygen cement acid immersion water resistance silica sol

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

茶皂素微波提取过程的优化及数学描述

华南理工大学学报（自然科学版） 2009年第4期37卷 125-129页

作者：吴雪辉张喜梅华南农业大学食品学院广东广州510642 华南理工大学轻工与食品学院广东广州510640

为充分利用油茶饼粕资源,采用正交试验法探讨了影响微波提取油茶饼粕中茶皂素效果的因素,优化出茶皂素提取工艺如下:微波功率800W、辐射时间280 s、固液质量比1∶18、原料粒度小于180μm.此条件下茶皂素的得率为11.98%.在此基础上,针对... 详细信息

为充分利用油茶饼粕资源,采用正交试验法探讨了影响微波提取油茶饼粕中茶皂素效果的因素,优化出茶皂素提取工艺如下:微波功率800W、辐射时间280 s、固液质量比1∶18、原料粒度小于180μm.此条件下茶皂素的得率为11.98%.在此基础上,针对影响微波提取茶皂素效果的微波功率、辐射时间、提取剂用量、原料粒度等因素,采用"黑箱方法",建立起各影响因素与茶皂素提取效果之间的综合数学模型,然后再逐渐逼近实验数据,用软件Matlab 7.3按最小二乘法原则,确定模型中的待定系数值.最后用试验结果对该模型进行验证,所得理论值和实验值之间的最大绝对误差为0.016%,说明该模型准确描述了油茶饼粕中茶皂素的微波提取过程.

关键词：微波提取油茶饼粕茶皂素数学模型

Structural Modal Parameter Recognition and Related Damage Identification Methods under Environmental Excitations: A Review

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2025年第1期19卷 25-54页

作者： Chao zhang Shang-xi Lai Hua-Ping Wang School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China Key Laboratory of Special Functional Materials and Structural Design Ministry of EducationLanzhou UniversityLanzhou730000China

Modal parameters can accurately characterize the structural dynamic properties and assess the physical state of the ***,it is particularly signiﬁcant to identify the structural modal parameters according to the monitoring data information in the structural health monitoring(SHM)system,so as to provide a scientiﬁc basis for structural damage identiﬁcation and dynamic model modiﬁ*** view of this,this paper reviews methods for identifying structural modal parameters under environmental excitation and brieﬂy describes how to identify structural damages based on the derived modal *** paper primarily introduces data-driven modal parameter recognition methods(e.g.,time-domain,frequency-domain,and time-frequency-domain methods,etc.),brieﬂy describes damage identiﬁcation methods based on the variations of modal parameters(e.g.,natural frequency,modal shapes,and curvature modal shapes,etc.)and modal validation methods(e.g.,Stability Diagram and Modal Assurance Criterion,etc.).The current status of the application of artiﬁcial intelligence(AI)methods in the direction of modal parameter recognition and damage identiﬁcation is further *** on the pre-vious analysis,the main development trends of structural modal parameter recognition and damage identiﬁcation methods are given to provide scientiﬁc references for the optimized design and functional upgrading of SHM systems.

关键词： Structural health monitoring data information modal parameters damage identiﬁcation AI method

Output-Feedback Robust Adaptive Control for Strict-feedback Stochastic Nonlinear Systems under Inverse Optimality Costs

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

Output-Feedback Robust Adaptive Control for Strict-feedback ...

温度对不同生态系统土壤甲烷氧化过程和甲烷氧化细菌的影响

第二十四届中国控制会议

作者： Wang Jun, zhang mei, xi Hongsheng, Cheng Rong (Department of Automation, USTC. Hefei 230026)

＜正＞ The solvable problem of adaptive inverse optimal stabilization in probability is discussed and control laws of global asymptotic stability in probability and adaptive inverse optimal stabilization in probability are developed for out-feedback stochastic nonlinear continuous systems with additive standard Wiener noises and constant unknown parameters by using Ito’s differentiation rule and adaptive backstepping algorithms. The adaptive control law and the parameter update laws can be obtained at same time by this design scheme.

关键词： out-feedback Wiener noises Ito’s differentiation rule Backstepping algorithm inverse optimahty stability in probability

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国农业气象 2022年第6期43卷 427-439页

作者：郭家宏范熠张西美中国农业科学院农业环境与可持续发展研究所/农业农村部旱地农业农村重点实验室北京100081

温室气体的大量人为排放导致了近百年来的全球气候变化。甲烷是重要的温室气体,随着全球气温升高,甲烷排放量会随之增加,进一步加剧了全球温室效应。土壤是甲烷重要的源和汇,土壤中的甲烷氧化细菌在平衡甲烷的释放过程中发挥着关键作用... 详细信息

温室气体的大量人为排放导致了近百年来的全球气候变化。甲烷是重要的温室气体,随着全球气温升高,甲烷排放量会随之增加,进一步加剧了全球温室效应。土壤是甲烷重要的源和汇,土壤中的甲烷氧化细菌在平衡甲烷的释放过程中发挥着关键作用。探究温度变化对土壤甲烷氧化能力的影响成为近年来的研究热点。本文综述了温度对土壤甲烷氧化过程以及甲烷氧化细菌的影响,分析了在不同温度下,各生态系统中的土壤甲烷氧化及甲烷氧化细菌响应特点和规律,比较了不同生态系统中土壤发生甲烷氧化的温度范围以及甲烷氧化菌株的生长温度范围。综述结果表明,不同生态系统能够发生甲烷氧化的温度范围不同;在能发生甲烷氧化的温度范围内,甲烷氧化速率随温度升高而增加;培养温度与土壤原位温度越相近时,甲烷氧化响应较为灵敏。与温度对甲烷氧化过程的影响类似,甲烷氧化细菌的丰度也随着温度升高而增加,并与增温幅度、优势甲烷氧化细菌的原位生长温度密切相关。土壤中的II型甲烷氧化细菌对温度较敏感,随着温度升高,II型甲烷氧化细菌丰度增加,因此,温度会通过影响甲烷氧化细菌的丰度和群落结构,从而影响甲烷氧化过程。但温度是否仅通过调控优势菌种更替来改变土壤甲烷氧化能力目前还尚未定论,未来需要进一步探究。本文讨论了土壤甲烷氧化过程对温度的响应及其微生物机制,可为全面解析全球变暖下的土壤甲烷氧化过程的变化提供参考。

关键词：温度甲烷氧化过程土壤甲烷氧化细菌

Complete Genome Sequencing and Analysis of Rehmannia Mosaic Virus Isolate from Shanxi Province

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Agricultural University(English Edition) 2021年第3期28卷 58-65页

作者： Wang De-fu zhang xi-mei Guo Shang Shen Shao-fei Long Dan-dan Li Ling-yu Niu Yan-bing College of Life Sciences Shanxi Agricultural UniversityTaigu 030801ShanxiChina Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100193China Shanxi Institute for Functional Food Shanxi Agricultural UniversityTaiyuan 030031ShanxiChina

Using double-stranded RNA(dsRNA)technology and sequence-independent amplification(SIA),the molecular identification on infected Rehmannia glutinosa in the field with mosaic symptoms was performed and the whole-genome of the Rehmannia mosaic virus(ReMV)Shanxi isolate(ReMV-SX)was *** analysis showed that the virus that infected Rehmannia glutinosa was Rehmannia mosaic virus(ReMV).The full-length of the obtained ReMV-SX sequence(GenBank accession ***575184)was 6395 nt,containing four open reading frames(ORFs).The sequence homology analysis of the complete nucleotide sequence showed that ReMV-SX was 93.8%-97.0%homologous to ReMV in Tobamovirus subgroup Ⅰ,while only 49.8%-58.9%homologous to the isolates in subgroups Ⅱ and Ⅲ of the same *** analysis showed that ReMV-SX and ReMV-Henan formed a separate branch and had the closest genetic *** results laid the foundation for ongoing researches in the taxonomic status and evolution of ReMV and for further investigating the pathogenic mechanism of ReMV infecting Rehmannia glutinosa.

关键词： Rehmannia mosaic virus(ReMV) Rehmannia glutinosa whole-genome amplification sequence analysis

自然气候环境的温度作用谱和混凝土内温度响应预计

在线全文

学校读者我要写书评

暂无评论

中南大学学报（自然科学版） 2010年第5期41卷 1923-1930页

作者：蒋建华袁迎曙张习美中国矿业大学力学与建筑工程学院江苏徐州221008

在人工气候和自然气候环境下,开展环境温度与混凝土内温度的监测试验,得到自然气候环境下混凝土内温度的响应规律。基于混凝土内温度响应的滞后规律,并采用极差分割的数学方法,提出对波动变化的自然环境温度的处理方法,进而构筑成自然... 详细信息

在人工气候和自然气候环境下,开展环境温度与混凝土内温度的监测试验,得到自然气候环境下混凝土内温度的响应规律。基于混凝土内温度响应的滞后规律,并采用极差分割的数学方法,提出对波动变化的自然环境温度的处理方法,进而构筑成自然环境的温度作用谱;最后,基于温度作用谱,并利用混凝土微环境温度响应预计模型,得到混凝土内温度响应谱。试验结果表明:与人工气候环境相比,自然环境温度随时间发生周期性和非周期性波动,混凝土内温度响应与气候环境温度之间存在时间上和数值上的滞后效应;混凝土内温度响应谱与自然环境下实测的混凝土内温度响应具有较好的一致性。

关键词：自然环境混凝土温度作用谱响应谱

在线全文

学校读者我要写书评

暂无评论

语言学在民族声乐教学中的应用

教育理论与实践 2016年第15期36卷 61-62页

作者：张喜梅张晋俐山西艺术职业学院音乐系山西大学音乐学院

语言作为民族声乐艺术的重要载体,在音乐学科中缺乏足够的重视。学校应该在音乐学科中建立一个系统的、涉及语言学的交叉性学科分支,为音乐学科的相关专业提供新的综合性理论研究方法。语言学的应用可以提升语言唱词本位在作品中的音乐... 详细信息

语言作为民族声乐艺术的重要载体,在音乐学科中缺乏足够的重视。学校应该在音乐学科中建立一个系统的、涉及语言学的交叉性学科分支,为音乐学科的相关专业提供新的综合性理论研究方法。语言学的应用可以提升语言唱词本位在作品中的音乐价值,便于创作者对曲调、节奏、唱词特点等整体风格的把握,从而为演唱教学打下良好的基础。

关键词：语言学民族声乐教学理论研究实践教学