检索结果-南通市图书馆

基于大变形升阻锚索深埋巷道围岩稳定性控制研究

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第2期31卷 558-575页

作者：孟波尹乾靖洪文刘盛东贾邦国 School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Yunlong Lake Laboratory of Deep Underground Science and Engineering Xuzhou 221116China

研发了一种新型大变形升阻锚索支护结构,通过串联6个壁厚5 mm含环形V槽的直管型钢结构实现锚索吸能让压,吸能率为44.55 J/g。拉拔试验结果表明新型锚索极限变形量(221.58 mm)与普通传统锚索相比增加了4.87倍,具有大变形、增阻及高吸能... 详细信息

研发了一种新型大变形升阻锚索支护结构,通过串联6个壁厚5 mm含环形V槽的直管型钢结构实现锚索吸能让压,吸能率为44.55 J/g。拉拔试验结果表明新型锚索极限变形量(221.58 mm)与普通传统锚索相比增加了4.87倍,具有大变形、增阻及高吸能等优良性能。通过离散元UDEC程序的二次开发,模拟了新型大变形增阻锚索支护阻力−变形曲线的双弹性阶段。采用新型锚索对深埋巷道围岩支护效果数值模拟结果表明,与无支护及传统锚索支护相比,顶板下沉量分别减小了88.33%与74.64%,稳定状态下最大主应力峰值分别减小了23.15%与18.34%,塑性区厚度分别减小了37.50%与62.50%。最后将新型大变形增阻锚索成功应用于真实巷道,两帮最大收敛变形量约为300 mm,实现了较好的支护效果。

关键词：大变形增阻吸能结构锚索稳定控制工程应用

Gastrointestinal manifestations of critical ill heatstroke patients and their associations with outcomes:A multicentre,retrospective,observational study

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

World Journal of Gastroenterology 2024年第4期30卷 346-366页

作者： Yu-Cong Wang Xin-Yang Jin Zheng Lei Xiao-Jiao Liu Yu Liu bang-guo Zhang Jian Gong Lie-Tao Wang Lv-Yuan Shi Ding-Yuan Wan Xin Fu Lu-Ping Wang Ai-Jia Ma Yi-Song Cheng Jing Yang Min He Xiao-Dong Jin Yan Kang Bo Wang Zhong-Wei Zhang Qin Wu Department of Critical Care Medicine West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina School of Pharmacy Macao University of Science and TechnologyMacao 999078China Department of Critical Care Medicine The First People's Hospital of Ziyang CityZiyang 641399Sichuan ProvinceChina Department of Critical Care Medicine The First People's Hospital of Guanghan CityChengdu 618399Sichuan ProvinceChina Department of Critical Care Medicine Lezhi County Traditional Chinese Medicine HospitalChengdu 641599Sichuan ProvinceChina Department of Critical Care Medicine Chengdu Qingbaijiang District People's HospitalChengdu 610399Sichuan ProvinceChina Department of Critical Care Medicine Ziyang People's HospitalChengdu 641399Sichuan ProvinceChina

BACKGROUND Extreme heat exposure is a growing health problem,and the effects of heat on the gastrointestinal(GI)tract is *** study aimed to assess the incidence of GI symptoms associated with heatstroke and its impact on *** To assess the incidence of GI symptoms associated with heatstroke and its impact on *** Patients admitted to the intensive care unit(ICU)due to heatstroke were included from 83 *** history,laboratory results,and clinically relevant outcomes were recorded at ICU admission and daily until up to day 15,ICU discharge,or *** symptoms,including nausea/vomiting,diarrhoea,flatulence,and bloody stools,were *** characteristics of patients with heatstroke concomitant with GI symptoms were *** regression analyses were performed to determine significant predictors of GI *** A total of 713 patients were included in the final analysis,of whom 132(18.5%)patients had at least one GI symptom during their ICU stay,while 26(3.6%)suffered from more than one *** with GI symptoms had a significantly higher ICU stay compared with those *** mortality of patients who had two or more GI symptoms simultaneously was significantly higher than that in those with one GI *** logistic regression analysis revealed that older patients with a lower GCS score on admission were more likely to experience GI *** The GI manifestations of heatstroke are common and appear to impact clinically relevant hospitalization outcomes.

关键词： Extreme heat Flatulence Sunstroke Intensive care units Diarrhea

“双创”背景下高职院校市场营销专业教学改革研究

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

教育教学论坛 2024年第6期 88-91页

作者：郭玫郭永邦王卫华湖南环境生物职业技术学院商学院湖南衡阳421005

市场营销是一门应用性较强的学科,毕业生会分布于市场的不同部门,成为后续创新创业的主力军。结合实际思考,首先,简要分析了“双创”的基本概述。其次,阐述了高职院校市场营销专业教学特点,同时对高职院校市场营销专业教学特点进行分析... 详细信息

市场营销是一门应用性较强的学科,毕业生会分布于市场的不同部门,成为后续创新创业的主力军。结合实际思考,首先,简要分析了“双创”的基本概述。其次,阐述了高职院校市场营销专业教学特点,同时对高职院校市场营销专业教学特点进行分析,提出了“双创”背景下高职院校市场营销专业教学工作中存在的问题。最后,陈述了健全实践教学机制、创新理论教学方法、更改课程考核方式、提高“双创”扶持力度、转变固有教学模式等“双创”背景下高职院校市场营销专业教学策略。

关键词： “双创” 高职院校市场营销专业

Development of a linear compressor for two-stage pulse tube cryocoolers

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1595-1600页

作者： Peng-da YAN Wei-li GAO guo-bang CHEN Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) power of 400 W. Preliminary measurements of the compressor indicated that both an efficiency of 35%～55% and a pressure ratio of 1.3～1.4 could be obtained. The two-stage pulse tube cryocooler driven by this compressor achieved the lowest temperature of 14.2 K.

关键词： Linear compressor Linear motor Pulse tube cryocooler

Impact of load impedance on the performance of a thermoacoustic system employing acoustic pressure amplifier

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第1期9卷 79-87页

作者： Ke TANG Zhong-jie HUANG Tao JIN guo-bang CHEN Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

An acoustic pressure amplifier (APA) is capable of improving the match between a thermoacoustic engine and a load by elevating pressure ratio and acoustic power output. A standing-wave thermoacoustic engine driving a resistance- and-compliance (RC) load through an APA was simulated with linear thermoacoustics to study the impact of load impedance on the performance of the thermoacoustic system. Based on the simulation results, analysis focuses on the distribution of pressure amplitude and velocity amplitude in APA with an RC load of diverse acoustic resistances and compliance impedances. Variation of operating parameters, including pressure ratio, acoustic power, hot end temperature of stack, etc., versus impedance of the RC load is presented and analyzed according to the abovementioned distribution. A verifying experiment has been performed, which indicates that the simulation can roughly predict the system operation in the fundamental-frequency mode.

关键词： Thermoacoustic engine Acoustic pressure amplifier (APA) Thermoacoustics

Tracking and localization for omni-directional mobile industrial robot using reflectors

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2018年第1期6卷 118-125页

作者： Shuai guo Ting-Ting Fang Tao Song Feng-Feng Xi bang-guo Wei Shanghai Key Laboratory of Intelligent Manufacturing andRobotics Shanghai University Shanghai 200444 People'sRepublic of China Department of Aerospace Engineering Ryerson UniversityToronto Canada

In this paper, an improved tracking and local-ization algorithm of an omni-directional mobile industrialrobot is proposed to meet the high positional accuracyrequirement, improve the robot＇s repeatability positioningprecision in the traditional trilateral algorithm, and solvethe problem of pose lost in the moving process. Lasersensors are used to identify the reflectors, and by associ-ating the reflectors identified at a particular time with thereflectors at a previous time, an optimal triangular posi-tioning method is applied to realize the positioning andtracking of the robot. The experimental results show thatpositioning accuracy can be satisfied, and the repeatabilityand anti-jamming ability of the omni-directional mobileindustrial robot will be greatly improved via this algorithm.

关键词： Mobile industrial robot Tracking and positioning Matching

Enhanced photo-catalytic activity of gold ion and gold modified

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

Journal of Environmental Sciences 2001年第2期13卷 201-204页

作者： LI Fang-bai GU guo-bang HUANG guo-feng LI Xin-jun WAN Hong-fu Guangdong Institute of Eco-Environment and Soil Science Guangzhou 510650China College of Chemical Engineering South China University of TechnologyGuangdong 510642China

The gold ion modified TiO2 was prepared by means of sol-gel whereas gold deposited TiO2 was prepared by means of photoreduction. The physical properties were influenced significantly by the presence of gold ion or gold. The enhanced photo-activity of gold modified TiO2 vas quantified in terms of methylene blue degradation. The presence of gold ion in TiO2 lattices or gold on TiO2 surface enhanced their-photo-activity. The optimum molar content of gold ion doping and gold deposition all was 0.5%. The first-order rates constants of gold modified TiO2 was more than that of pure TiO2, and decreased by increasing the content of gold ion and gold when their contents were more than 0.5%. Gold ion doped in TiO2 lattices was more effective to enhance the photo-activity than gold on TiO2 surface. Moreover, the relationship between physical properties, chemical properties and photo-activity has been discussed.

关键词： gold modification titanium dioxide photo-catalysis methylene blue

Characteristics study on the oscillation onset and damping of a traveling-wave thermoacoustic prime mover

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第7期9卷 944-949页

作者： Tao JIN Chang-song MAO Ke TANG Hao ZHENG guo-bang CHEN Institute of Refrigeration and Cryogenics Zhejiang University Hangzhou 310027 China

This paper focuses on the temperature and pressure characteristics of a Swift-Backhaus type traveling-wave thermoacoustic prime mover during its onset and damping processes,in order to understand the intrinsic mechanism of thermoacoustic oscillation onset and the feasibility of using low-grade thermal energy based on a low onset temperature. The influences of heat input and filling pressure on hysteretic loop,due to the noncoincidence between onset and damping processes,are measured and analyzed. The condition for the occurrence of hysteresis is also briefly discussed.

关键词： Thermoacoustics Onset and damping Hysteretic loop

Asymmetric synthesis of emericellamide B

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第10期26卷 1209-1215页

作者： Rong-guo Ren Jing-Yi Ma Zhuo-Ya Mao Yi-Wen Liu bang-guo Wei Department of Chemistry and Institutes of Biomedical Sciences Fudan University School of Pharmacy Fudan University

Asymmetric total synthesis of emericellamide B（9.4%, 17 longest linear steps） is detailed in this report. In this synthetic route, the highly methylated（2R,3R,4S,6S）-3-hydroxy-2,4,6-trimethyldodecanoic acid（HTMD） unit was effectively prepared through the asymmetric methylation, Wittig and Horner–Wadsworth–Emmons reaction. Moreover, pentafluorophenyl diphenylphophinate（FDPP） proved to be an effective condensation reagent for the macrolactamization between C14 and C18.

关键词： Cyclic depsipeptide Antifungal agents Emericellamide Total synthesis Macrolactamization