检索结果-南通市图书馆

Isogeometric Analysis with Local Adaptivity for Vibration of Kirchhoff Plate

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第5期131卷 949-978页

作者： peng yu Weijing yun Junlei Tang Sheng he College of Civil Engineering and Architecture Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationGuangxi Key Laboratory of Disaster Prevention and Structural SafetyGuangxi UniversityNanning530000China

Based on our proposed adaptivity strategy for the vibration of Reissner-Mindlin plate,we develop it to apply for the vibration of Kirchhoff *** adaptive algorithm is based on the Geometry-Independent Field approximaTion(GIFT),generalized from Iso-Geometric Analysis(IGA),and it can characterize the geometry of the structure with NURBS(Non-Uniform Rational B-Splines),and independently apply PHT-splines(Polynomial splines over Hierarchical T-meshes)to achieve local refinement in the solution ***(Modal AssuranceCriterion)is improved to locate unique,as well as multiple,modal correspondence between different meshes,in order to deal with error *** adaptivity is carried out by sweeping modes from low to high *** examples showthat a proper choice of the spline space in solution field(with GIFT)can deliver better accuracy than using NURBS solution *** addition,for vibration of heterogeneous Kirchhoff plates,our proposed method indicates that the adaptive local h-refinement achieves a better solution accuracy than the uniform h-refinement.

关键词： Isogeometric analysis local refinement adaptivity vibration kirchhoff plate

慢性阻塞性肺疾病合并慢性呼吸衰竭患者血乳酸联合BNP检测对患者预后影响研究

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

标记免疫分析与临床 2018年第3期25卷 372-374,379页

作者：梁倩贺鹏余卫中屈世芳张寰江汉大学附属医院武汉市第六医院综合二科湖北武汉430015

目的研究慢性阻塞性肺疾病合并慢性呼吸衰竭患者血乳酸联合BNP检测对患者预后的影响。方法随机选择2014年1月至2016年1月我院收治的79例慢性阻塞性肺疾病合并慢性呼吸衰竭患者,患者按治疗效果分为A组(有效)和B组(无效)。观测记录患者治... 详细信息

目的研究慢性阻塞性肺疾病合并慢性呼吸衰竭患者血乳酸联合BNP检测对患者预后的影响。方法随机选择2014年1月至2016年1月我院收治的79例慢性阻塞性肺疾病合并慢性呼吸衰竭患者,患者按治疗效果分为A组(有效)和B组(无效)。观测记录患者治疗前后的pH值,动脉二氧化碳分压(Pa CO2)、动脉血氧分压(Pa O2)、血乳酸及血浆脑钠肽(BNP)的水平。结果 B组起始的血乳酸和BNP明显高于A组,A组中血乳酸和BNP在24 h内降为正常,而B组24 h血乳糖和BNP水平持续升高,且持续时间明显长于A组,差异具有统计学意义(P<0.05)。B组的pH值、Pa O2明显低于A组pH值、Pa O2,Pa CO2明显高于A组Pa CO2,差异有统计学意义(P<0.05)。结论采用血乳酸联合BNP检测评价COPD合并慢性呼吸衰竭患者,及时反映患者体内血乳酸、BNP水平,准确及时评价患者的治疗效果及预后。

关键词：慢性阻塞性肺疾病慢性呼吸衰竭血乳酸脑钠肽

Twelve-year outcomes after revascularization for ostial/shaft lesions in unprotected left main coronary artery

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2020年第6期17卷 338-343页

作者： Xian-peng yu yu LI Ji-Qiang he Ze-Ning JIN Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijingChina Department of Cardiology and Macrovascular Disease Beijing Tiantan HospitalCapital Medical UniversityBeijingChina

Objective To evaluate a very long-term clinical outcomes of patients treated with coronary artery bypass grafting(CABG) and percutaneous coronary intervention(PCI) with drug-eluting stents(DES) for ostial/shaft lesions in unprotected left main coronary artery(ULMCA). Methods & Results A total of 472 patients with isolated ostial/shaft lesions in ULMCA were enrolled, who received DES implantation or underwent CABG between January 2003 and July 2009 in Beijing Anzhen Hospital. The major endpoints of this study were death, repeat revascularization, non-procedural myocardial infarction(MI) and stroke. The median follow-up was twelve years(interquartile range: 9.4–14.0 years) in the overall patients. There were no significant differences of incidence of death(23.3% vs. 25.6%, P = 0.227), repeat revascularization(27.3% vs. 28.4%, P = 0.423), non-procedural MI(20.0% vs. 14.5%, P = 0.561), and stroke(6.1% vs. 9.3%, P = 0.255) between PCI and CABG groups before multivariate adjusting. After adjusting covariates with multivariate Cox hazard regression model, there were still no significant differences between PCI and CABG groups. Conclusions During the median follow-up of twelve years, we found that PCI with DES was as effective and safe as CABG in patients with left main ostial/shaft lesion in this observational study.

关键词： Coronary artery bypass grafting Left main ostial/shaft lesions Percutaneous coronary intervention Prognosis

在线全文

学校读者我要写书评

暂无评论

WQH-4卧式强剪混合机研究设计

江西农业学报 2008年第5期20卷 71-72页

作者：赵祥雄何予鹏袁志华康相涛河南农业大学机电工程学院河南郑州450002 河南农业大学牧医工程学院河南郑州450002

为了将牧畜粪便与添加剂进行充分混合搅拌,要求混合机具有较强的剪切能力。为此,设计了WQH-4卧式强剪切混合机,并对其设计原理、结构和技术性能等主要参数进行了理论分析和论证。

关键词：混合机剪切牲畜排泄物设计

纹党和红芪加工废弃物中的活性多糖对Ⅱ型糖尿病小鼠血糖血脂的影响

在线全文

学校读者我要写书评

暂无评论

甘肃农业大学学报 2020年第2期55卷 32-39页

作者：叶文斌宫峥嵘何玉鹏陈耀年赵庆芳周紫鹃陇南师范高等专科学校农林技术学院甘肃成县742500 西北师范大学生命科学学院甘肃兰州730070 中国科学院寒区旱区工程研究所甘肃兰州730000

【目的】研究陇南道地中药材纹党和红芪加工废弃物中提取的活性多糖对Ⅱ型糖尿病小鼠血糖血脂的影响.【方法】将用高糖高脂喂养1个月的小鼠,以剂量为45 mg/kg腹腔注射链脲霉素(Streptozotocin,STZ)构建小鼠Ⅱ型糖尿病模型,将建模成功的... 详细信息

【目的】研究陇南道地中药材纹党和红芪加工废弃物中提取的活性多糖对Ⅱ型糖尿病小鼠血糖血脂的影响.【方法】将用高糖高脂喂养1个月的小鼠,以剂量为45 mg/kg腹腔注射链脲霉素(Streptozotocin,STZ)构建小鼠Ⅱ型糖尿病模型,将建模成功的小鼠随机分为正常对照组、Ⅱ型糖尿病模型组、纹党多糖(Codonopisis pilosula polysaccharides,CPP)处理组、红芪多糖(hedysarum polybotrys polysaccharides,CHP)处理组和二甲双胍处理组.连续灌胃给药28 d,研究两种多糖对Ⅱ型糖尿病小鼠空腹血糖(fasting blood glucose,FBG)、糖化血红蛋白(glycosylated hemoglobin,HbAlc)、总胆固醇(total cholesterol,TC)、甘油三酯(triglyceride,TG)、高密度脂蛋白(high density lipoprotein,HDL)、低密度脂蛋白(low density liporotein,LDL)等指标的影响.【结果】经过测定提取的纹党多糖和红芪多糖得率分别为16.52%和13.96,纯度为99.65%和99.38%,剂量在400 mg/kg时纹党多糖对正常小鼠血糖水平的降低和对Ⅱ型糖尿病小鼠治疗效果明显优于黄芪多糖.【结论】纹党多糖和红芪多糖均能降低正常小鼠的血糖,纹党多糖和红芪多糖组合降糖能力最好,能有效降低Ⅱ型糖尿病小鼠的FBG、HbAlc、TC、TG含量,促进HDL含量升高,所以纹党和红芪加工废弃物中提取的活性多糖能够显著降低Ⅱ型糖尿病小鼠血糖,并能显著改善糖尿病小鼠血脂代谢紊乱.

关键词：纹党红芪加工废弃物活性多糖 Ⅱ型糖尿病小鼠血糖血脂

Floor heave mechanism for gob-side entry retaining with concrete blocks and control method:A case study

在线全文

学校读者我要写书评

暂无评论

Underground Space 2024年第2期15卷 244-259页

作者： Jiong Wang peng Liu Manchao he Guangyuan yu Huanzhi Tian State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China College of Mining Engineering North China University of Science and TechnologyTangshan 063210China

The issue of significant floor heave deformation in gob-side entry retaining has long been a challenging problem in the context of longwall *** paper studies the floor heave failure mechanism and control method for gob-side entry retaining with concrete blocks in Guizhou Faer Coal Mine in *** on Rankine’s earth pressure theory,the effective shear stress equation for the plastic slip of roadway floor is *** deformation mechanism of floor heave in a retaining roadway with a block wall is revealed in this *** new comprehensive control method is proposed,encompassing roof pre-splitting blasting for pressure relief,reinforcing cables for roof control,double directions control bolts for concrete block,and pliability cushion yielding ***3D numerical calculation model is established,which shows that the new method can effectively reduce the average vertical stress peak value of the entity coal floor by 34.6%and significantly reduce the pressure source causing the roadway floor ***,a multi-parameter real-time online monitoring system for mine pressure was designed,and field tests were carried *** results show that the maximum value of roadway floor heave under the new method is 163 mm,reduced by 66.9%,and the roadway floor heave is effectively *** research findings offer a fresh perspective and new ideas for controlling floor heave in mining operations.

关键词： Gob-side entry retaining Floor heave mechanism Plastic slip Control methods Mine pressure monitoring

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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

Nano Research 2025年第1期18卷 315-322页

作者： Kun-peng Yang Song Xie Zi-Meng Han Hao-Cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li Qing-Fang Guan Shu-Hong yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

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

智能配电网边缘计算研究现状与展望

计算机与现代化 2023年第8期 87-92页

作者：何玉鹏陶勇王必恒赵英男国网宁夏电力有限公司宁夏回族自治区银川750002 国电南瑞南京控制系统有限公司江苏南京210031 南京信息工程大学计算机学院江苏南京210044

随着人工智能和物联网技术的快速发展,配电网正逐步走向智能化。但是海量数据使云计算面临时延变长、网络拥堵、隐私泄露等问题。边缘计算作为一种新的计算范式,可以通过网络边缘节点,有效解决上述问题,在智能配电网中的应用日益广泛。... 详细信息

随着人工智能和物联网技术的快速发展,配电网正逐步走向智能化。但是海量数据使云计算面临时延变长、网络拥堵、隐私泄露等问题。边缘计算作为一种新的计算范式,可以通过网络边缘节点,有效解决上述问题,在智能配电网中的应用日益广泛。本文针对近年来智能配电网边缘计算技术进行了综述。首先概述智能配电网的特征以及在该应用场景中边缘计算的定义和架构;其次从不同维度分析了应用现状,包括故障诊断与检测、数据分析、优化调度和数据安全与保护,最后对智能配电网场景下的研究挑战进行了总结,提出数据精细化管理、资源模块化共享、边缘安全性维护3个方面的研究展望。

关键词：物联网边缘计算云计算智能配电网

Structural and electrical properties of HCl–polyaniline–Ag composites synthesized by polymerization using Ag-coated (NH_4)_2S_2O_8 powder

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第11期25卷 1329-1334页

作者： You Zhou yu-he Zhang Jun-sheng Ma Ming-peng yu Hong Qiu School of Mathematics and Physics University of Science and Technology Beijing

Ag nanoparticles were sputter-deposited on ammonium persulfate((NH_4)_2S_2O_8) powder to obtain(NH_4)_2S_2O_8-Ag powder, which was used to synthesize the HCl-doped polyaniline-Ag(HCl-PANI-Ag) composite via a polymerization procedure. The Ag nanoparticles were dispersed in the HCl-PANI matrix, and their sizes mainly ranged from 3 to 6 nm. The Ag nanoparticles did not affect the structure of emeraldine salt in the composite, and they increased the ordered crystalline regions in the HCl-PANI matrix. The HCl-PANI-Ag composite had a conductivity of(6.8 ± 0.1) S/cm, which is about four times larger than that of the HCl-PANI. The charge transport mechanism in the composite is explained by the three-dimensional Mott variable-range hopping(3D-Mott-VRH).

关键词： hydrochloric-acid-doped polyaniline silver nanoparticles composite structure conductivity