检索结果-南通市图书馆

Ductility and Ultimate Capacity of Concrete-Filled Lattice Rectangular Steel Tube Columns

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2018年第2期12卷 99-110页

作者： Chengquan Wang yun zou Tianqi Li Jie Ding Xiaoping Feng Tiange Lei Jiangnan University No.1800Wuxi214000China

A kind of concrete-filled lattice rectangular steel tube(CFLRST)column was put *** numerical simulation was modeled to analyze the mechanical characteristic of CFLRST *** comparing the load-deformation curves from the test results,the rationality and reliability of the finite element model has been confirmed,moreover,the change of the section stiffness and stress in the forcing process and the ultimate bearing capacity of the column were *** on the model,the comparison of ultimate bearing capacity and ductility between CFLRST column and reinforced concrete(RC)column were also *** results of the finite element analysis show that the loading process of CFLRST column consists of elastic stage,yield stage and failure *** failure modes are mainly strength failure and failure of elastoplastic *** column has higher bearing capacities in comparison with reinforced concrete columns with the same steel *** addition,the stiffness degeneration of CFLRST column is slower than RC column and CFLRST column has good ductility.

关键词： Steel-concrete composite structure concrete-filled lattice rectangular steel tube column nonlinear finite element ultimate strength ductility

临界梯度模型的优化及集成模拟中高能量粒子模块的搭建

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

物理学报 2023年第21期72卷 82-94页

作者：邹云鹏陈锡熊陈伟核工业西南物理研究院成都610041 通用原子能加州CA 92186-5608 中国科学技术大学核科学与技术学院合肥230026

基于临界梯度模型,使用TGLFEP和EPtran两个程序可以模拟分析阿尔芬本征模引起的高能量粒子输运问题.本文在原有模型的基础上,加入了两点改进使模拟结果更接近实验.其一,考虑阈值剖面的演化过程.判断阈值的物理量由密度梯度(dn/dr)改为... 详细信息

基于临界梯度模型,使用TGLFEP和EPtran两个程序可以模拟分析阿尔芬本征模引起的高能量粒子输运问题.本文在原有模型的基础上,加入了两点改进使模拟结果更接近实验.其一,考虑阈值剖面的演化过程.判断阈值的物理量由密度梯度(dn/dr)改为归一化的密度梯度((dn/dr)/(n/a)),并且使用TGLFEP模拟证明阈值与高能量粒子密度成反比例关系,也就是说,当密度降低时,阈值会增大.第二,考虑有限轨道宽度效应.使用OBRIT程序计算高能量粒子的损失锥,并输入到EPtran程序中,从而增加了一种高能量粒子的损失通道.利用DⅢ-D#142111和#153071进行实验验证,结果表示改进后的模型更接近实验.最后,利用神经网络代替TGLFEP计算临界梯度,并实现EPtran的并行计算以缩短运行时间.以此建立一个EP模块并加入到OMFIT集成模拟中,模拟结果表示当阿尔芬本征模驱动高能量粒子输运,会导致芯部的压强和电流降低,从而提升当地的安全因子,改变平衡位形.

关键词：高能量粒子阿尔芬本征模临界梯度模型输运

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

中国共产党民主集中制的发展历程与经验启示

理论视野 2022年第6期 5-10页

作者：邹运孟宪生东北师范大学马克思主义学部

民主集中制是党的根本组织制度和领导制度,是党最大的制度优势。党的百年发展历程表明,坚持民主集中制要维护党中央权威和集中统一领导,以党内民主推动人民民主,与时俱进地创新发展民主集中制理论,推进民主集中制的制度化、规范化。总... 详细信息

民主集中制是党的根本组织制度和领导制度,是党最大的制度优势。党的百年发展历程表明,坚持民主集中制要维护党中央权威和集中统一领导,以党内民主推动人民民主,与时俱进地创新发展民主集中制理论,推进民主集中制的制度化、规范化。总结上述基本经验,为新时代坚持民主集中制,推进党的建设新的伟大工程提供重要借鉴。

关键词：中国共产党民主集中制发展历程经验启示

Accidental placement of venous return catheter in the superior vena cava during venovenous extracorporeal membrane oxygenation for severe pneumonia: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第4期12卷 782-786页

作者： Xiao-Qin Song yun-Long Jiang Xian-Bao zou Shi-Chao Chen Ai-Jun Qu Ling-Ling Guo Emergency Department Liaocheng People’s HospitalLiaocheng 252000Shandong ProvinceChina

BACKGROUND Venovenous extracorporeal membrane oxygenation(V-V ECMO)has become an important treatment for severe pneumonia,but there are various complications during the *** article describes a case with severe pneumonia success-fully treated by V-V ECMO,but during treatment,the retrovenous catheter,which was supposed to be in the right internal vein,entered the superior vena cava directly in the *** ECMO was safely withdrawn after multidiscip-linary *** experience with this case is expected to provide a reference for colleagues who will encounter similar *** SUMMARY A 64-year-old man had severe pulmonary infection and respiratory *** was admitted to our hospital and was given ventilation support(fraction of inspired oxygen 100%).The respiratory failure was not improved and he was treated by V-V ECMO,during which the venous return catheter,which was supposed to be in the right internal vein,entered the superior vena cava directly in the *** was a risk of massive mediastinal bleeding if the catheter was removed directly when the ECMO was ***,the patient underwent vena cava angiography+balloon attachment+ECMO with-drawal in the operating room(prepared for conversion to thoracotomy for vascular exploration and repair at any time during surgery)after multidiscip-linary *** was safely withdrawn,and the patient recovered and was *** Patients may have different vascular *** cooperation can ensure patient *** experience will provide a reference for similar cases.

关键词： Severe pneumonia Extracorporeal membrane oxygenation Complications Superior vena cava Multidisciplinary consultation Case report

面向风电机组有功功率控制的风轮变速运行模式比较研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国电机工程学报 2022年第12期42卷 4419-4429页

作者：殷明慧顾伟陈载宇邹云南京理工大学自动化学院江苏省南京市210094

电力系统迫切需要风电机组(简称风机)从最大功率点跟踪控制转变为支撑电网二次调频的有功功率控制(active power control,APC)。延续最大功率点跟踪控制的设计思路,现有风机APC控制研究大多基于系统稳态的视角,将风机控制到稳定平衡点,... 详细信息

电力系统迫切需要风电机组(简称风机)从最大功率点跟踪控制转变为支撑电网二次调频的有功功率控制(active power control,APC)。延续最大功率点跟踪控制的设计思路,现有风机APC控制研究大多基于系统稳态的视角,将风机控制到稳定平衡点,在稳定平衡点处响应电网指令和维持机电动态稳定。但面对湍流风速,大惯量风轮实际上处于不断变速的动态过程中,而非持续运行在稳定平衡点处,对APC控制性能造成不容忽视的影响。为此该文从现有风机APC控制策略中归纳出两种风轮变速运行模式:主动变速和被动变速,两者对应于截然不同的变速机理和动态过程。运用频域分析和实验数据分析,比较了两种变速运行模式在功率指令响应性能、传动链载荷及变桨执行机构疲劳载荷方面的差异。结果表明,被动变速放弃了对稳定平衡点的跟踪,利用风轮惯性响应缓冲风速波动,更适用于湍流风速场景。该文工作为风机APC控制设计与性能优化提供了风机运行机理方面的基础。

关键词：风电机组有功功率控制风轮变速湍流风速

Scientific objectives and payload configuration of the Chang'E-7 mission

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第2期11卷 285-300页

作者： Chi Wang Yingzhuo Jia Changbin Xue Yangting Lin Jianzhong Liu Xiaohui Fu Lin Xu yun Huang Yufen Zhao Yigang Xu Rui Gao Yong Wei Yuhua Tang Dengyun Yu Yongliao zou State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences National Space Science Center Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geochemistry Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and Physics Institute of Space SciencesShandong University Institute of Drug Discovery Technology Ningbo University State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Engineering Sun Yat-sen University Lunar Exploration and Space Engineering Center China Aerospace Science and Technology Corporation

As the cornerstone mission of the fourth phase of the Chinese Lunar Exploration Program, Chang'E-7(CE-7) was officially approved, and implementation started in 2022, including a main probe and a communication relay satellite. The main probe, consisting of an orbiter, a lander, a rover and a mini-flying probe, is scheduled to be launched in 2026. The lander will land on Shackleton crater's illuminated rim near the lunar south pole, along with the rover and mini-flying probe. The relay satellite(named Queqiao-2) will be launched in February 2024 as an independent mission to support relay communication during scientific exploration undertaken by Chang'E-4, the upcoming Chang'E-6 in 2024 and subsequent lunar *** CE-7 mission is mainly aimed at scientific and resource exploration of the lunar south pole. We present CE-7's scientific objectives, the scientific payloads configuration and the main functions for each scientific payload with its key technical specifications.

关键词： Chang’ E-7 scientific objectives scientific payloads

Preoperative prediction of lymphovascular and perineural invasion in gastric cancer using spectral computed tomography imaging and machine learning

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第6期30卷 542-555页

作者： Hui-Ting Ge Jian-Wu Chen Li-Li Wang Tian-Xiu zou Bin Zheng Yuan-Fen Liu yun-Jing Xue Wei-Wen Lin Department of Radiology Fujian Medical University Union HospitalFuzhou 350001Fujian ProvinceChina Fujian Key Laboratory of Intelligent Imaging and Precision Radiotherapy for Tumors Fujian Medical UniversityFuzhou 350001Fujian ProvinceChina Digestive Hematological and Breast MalignanciesClinical Research Center for Radiology and Radiotherapy of Fujian ProvinceFuzhou 350001Fujian ProvinceChina Department of Radiation Oncology Fujian Medical University Union HospitalFuzhou 350001Fujian ProvinceChina Department of Diagnostic Radiology Fujian Medical University Union HospitalFuzhou 350001Fujian ProvinceChina School of Electrical and Computer Engineering University of OklahomaOklahomaOK 73019United States

BACKGROUND Lymphovascular invasion(LVI)and perineural invasion(PNI)are important prognostic factors for gastric cancer(GC)that indicate an increased risk of metastasis and poor *** preoperative prediction of LVI/PNI status could help clinicians identify high-risk patients and guide treatment ***,prior models using conventional computed tomography(CT)images to predict LVI or PNI separately have had limited *** CT provides quantitative enhancement parameters that may better capture tumor *** hypothesized that a predictive model combining clinical and spectral CT parameters would accurately preoperatively predict LVI/PNI status in GC *** To develop and test a machine learning model that fuses spectral CT parameters and clinical indicators to predict LVI/PNI status *** This study used a retrospective dataset involving 257 GC patients(training cohort,n=172;validation cohort,n=85).First,several clinical indicators,including serum tumor markers,CT-TN stages and CT-detected extramural vein invasion(CT-EMVI),were extracted,as were quantitative spectral CT parameters from the delineated tumor ***,a two-step feature selection approach using correlation-based methods and information gain ranking inside a 10-fold cross-validation loop was utilized to select informative clinical and spectral CT parameters.A logistic regression(LR)-based nomogram model was subsequently constructed to predict LVI/PNI status,and its performance was evaluated using the area under the receiver operating characteristic curve(AUC).RESULTS In both the training and validation cohorts,CT T3-4 stage,CT-N positive status,and CT-EMVI positive status are more prevalent in the LVI/PNI-positive group and these differences are statistically significant(P<0.05).LR analysis of the training group showed preoperative CT-T stage,CT-EMVI,single-energy CT values of 70 keV of venous phase(VP-70 keV),and the ratio of standardized iodine co

关键词： Spectral computed tomography Gastric cancer Lymphovascular invasion Perineural invasion

Different concentrations of hyaluronic acid eye drops for dry eye syndrome: a systematic review and Meta-analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第6期17卷 1110-1119页

作者： Xiao-Wei Ouyang Sheng Fang yun-Min Yi Shi-Peng zou Qi-Yu Hu Zi-Xuan Huang Qing-Xia Li Jin-Yan Luo Department of Ophthalmology Nanchang Hongdu Hospital of Traditional Chinese MedicineNanchang 330000Jiangxi ProvinceChina Department of Ophthalmology Jiangxi Hospital of Integrated Traditional Chinese and Western MedicineNanchang 330000Jiangxi ProvinceChina Department of Cataract Nanchang University Affiliated Eye HospitalNanchang 330000Jiangxi ProvinceChina Department of Neuro-ophthalmology Nanchang University Affiliated Eye HospitalNanchang 330000Jiangxi ProvinceChina

AIM:To compare high or low concentration of hyaluronic acid eye drops(HY)for dry eye syndromes(DES).METHODS:Randomized controlled trials(RCTs)comparing various concentrations of HY were searched in PubMed,Embase,Web of Science,Cochrane,SinoMed,CNKI,Wanfang Database,CQVIP,and Chinese journals databases between inception and July *** standardized mean differences(SMD)or weighted mean difference(WMD)with 95%confidence intervals(CI)from RCTs evaluating Schirmer’s I test(SIT),corneal fluorescein staining score(CFS),tear breakup time(TBUT),DES score(DESS),and Ocular Surface Disease Index(OSDI)were *** analysis,Egger’s test and Meta-regression analysis were performed for all ***:We conducted a Meta-analysis of 10 RCTs that met the inclusion criteria,involving 1796 ***-concentrations group significantly improved the outcome of CFS according to random effects modelling(SMD,-3.37;95%CI,-5.25 to-1.48;P=0.0005).The rest of the results were not statistically significant,including indicators such as SIT,TBUT,DESS and ***:For dry eyes with positive corneal staining,a high concentration of HY is recommended,whereas in other cases,a high concentration of HY does not offer a more pronounced advantage over a low concentration of HY in the treatment of dry eyes.

关键词： dry eye hyaluronic acid concentration Meta-analysis

Quantificational analysis on progress of river water quality in China

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 2009年第6期21卷 770-773页

作者： yun Yi,zou Zhihong,FENG Wei,RU Mai School of Economics and Management,Beihang University,Beijing 100191,China. School of Economics and Management Beihang University Beijing 100191 China. E-mail: winniecloud81@***

In order to understand the dynamic change of water quality in a specific period of time,a type of possibility transition matrix based on the theory of Markov process was *** transition possibility with a weight to calculate the degree of absolute advancement was given based on the result of water quality *** concept of relative advancement was *** was used to evaluate the extent of water quality changed in a period of *** method was used to calculate the degrees of relative advancement for 4 rivers in China,and the results were analyzed.

关键词： water quality evaluation possibility transition matrix Markov process degree of advancement