检索结果-南通市图书馆

Mechanical properties of high-strength concrete subjected to high temperature by stressed test

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

中国有色金属学会会刊：英文版 2009年第B09期19卷 128-133页

作者： Gyu-Yong kim Young-sun kim Tae-Gyu LEE Division of Architecture Engineering Chun gnam National University

Recently, the effects of high temperature on compressive strength and elastic modulus of high strength concrete were experimentally investigated. The present study is aimed to study the effect of elevated temperatures ranging from 20 ℃ to 700 ℃ on the material mechanical properties of high-strength concrete of 40, 60 and 80 MPa grade. During the strength test, the specimens are subjected to a 25% of ultimate compressive strength at room temperature and sustained during heating, and when the target temperature is reached, the specimens are loaded to failure. The tests were conducted at various temperatures (20-700 ℃) for concretes made with W/B ratios of 46%, 32% and 25%, respectively. The results show that the relative values of compressive strength and elastic modulus decrease with increasing compressive strength grade of specimen.

关键词：高强混凝土高温作用力学性能测试抗压强度温度升高弹性模量强度试验

Experimental Study on the Inlet Fogging System Using Two-Fluid Nozzles

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2010年第2期19卷 132-135页

作者： Abhilash Suryan Dong sun kim Heuy Dong kim School of Mechanical Engineering Andong National University FMTRC Daejoo Machinery Co.

Large-capacity compressors in industrial plants and the compressors in gas turbine engines consume a considerable amount of power. The compression work is a strong fimction of the ambient air temperature. This increase in compression work presents a significant problem to utilities, generators and power producers when electric demands are high during the hot months. In many petrochemical process industries and gas turbine engines, the in- crease in compression work curtails plant output, demanding more electric power to drive the system. One way to counter this problem is to directly cool the inlet air. Inlet fogging is a popular means of cooling the inlet air to air compressors. In the present study, experiments have been performed to investigate the suitability of two-fluid nozzle for inlet fogging. Compressed air is used as the driving working gas for two-fluid nozzle and water at am- bient conditions is dragged into the high-speed air jet, thus enabling the entrained water to be atomized in a very short distance from the exit of the two-fluid nozzle. The air supply pressure is varied between 2.0 and 5.0 bar and the water flow rate entrained is measured. The flow visualization and temperature and relative humidity measurements are carried out to specify the fogging characteristics of the two-fluid nozzle.

关键词： Evaporative Cooling Inlet Fogging Energy Savings Two-fluid Nozzles

壮通饮通过Nrf2-SCL7A11/xCT-Gpx4通路调控铁死亡改善脑缺血再灌注损伤

在线全文

学校读者我要写书评

暂无评论

中山大学学报（医学科学版） 2024年第4期45卷 539-548页

作者：王成毅蔡粤芳宁振求邓敏贞孙景波 Sookja kim CHUNG 李岩程骁广州中医药大学第二临床医学院广东广州510006 深圳市人民医院、南方科技大学第一附属医院、暨南大学第二临床医学院广东深圳518020 省部共建中医湿证国家重点实验室广东广州510120 广东省中医急症研究重点实验室广东广州510120 澳门科技大学医学院中国澳门999078 广西国际壮医医院广西南宁530201

【目的】探究壮通饮通过Nrf2-SCL7A11/xCT-Gpx4通路调控铁死亡对大脑中动脉栓塞模型小鼠脑缺血再灌注损伤的保护作用及其机制。【方法】将C57BL/6J小鼠随机分为假手术组(Sham)、模型组(MCAO)、低剂量壮通饮组(ZTY-L+MCAO),高剂量壮通饮... 详细信息

【目的】探究壮通饮通过Nrf2-SCL7A11/xCT-Gpx4通路调控铁死亡对大脑中动脉栓塞模型小鼠脑缺血再灌注损伤的保护作用及其机制。【方法】将C57BL/6J小鼠随机分为假手术组(Sham)、模型组(MCAO)、低剂量壮通饮组(ZTY-L+MCAO),高剂量壮通饮组(ZTY-H+MCAO),每组5只。其中MCAO组采用硅胶线栓法进行造模,小鼠大脑中动脉栓塞1h,拔出线栓再灌注72h后进行心脏灌注取脑,Sham组除了不插入线栓其余操作同MCAO组。采用Zea-Longa法对小鼠神经功能进行评分;采用TTC染色评估小鼠脑梗死体积;采用HE染色、尼氏染色评估脑损伤程度;采用普鲁士蓝染色评价三价铁离子蓄积水平;qPCR检测铁离子转运相关载体受体TfR1和DMT1、脂质过氧化相关基因ACSL4以及铁死亡标志物PTGS2 mRNA表达;ELISA试剂盒检测4-HNE的含量评估小鼠大脑脂质过氧化水平;Western-blot、免疫荧光检测小鼠脑组织中Nrf2、SCL7A11/xCT、Gpx4蛋白水平。【结果】①壮通饮改善了MCAO/R后小鼠神经功能(P<0.05)和大脑梗死体积(P<0.05)及缓解MCAO/R后大脑皮层细胞病理损伤。②壮通饮减弱了MCAO/R后小鼠大脑组织的三价铁离子蓄积状态;减少MCAO/R后小鼠大脑中与铁离子转运入细胞内相关载体TfR1和DMT1 mRNA的表达(P<0.001);下调MCAO/R后小鼠大脑脂质过氧化物4-HNE含量和组织脂质过氧化物酶ACSL4 mRNA表达(P<0.001);降低MCAO/R后小鼠大脑铁死亡标志物PTGS2 mRNA表达(P<0.001)。③壮通饮增加MCAO/R后Nrf2入核表达(P<0.001),以及增加xCT和Gpx4在神经元中的表达(P<0.001)。【结论】壮通饮能够改善MCAO/R小鼠神经功能和脑梗死体积,缓解大脑皮层细胞病理损伤,影响Nrf2-SCL7A11/xCT-Gpx4通路关键信号分子表达,所以壮通饮改善小鼠MCAO/R损伤的作用机制可能是通过Nrf2-SCL7A11/xCT-Gpx4通路调节铁死亡水平达到的。

关键词：缺血性脑卒中铁死亡壮通饮 Nrf2-SCL7A11/xCT-Gpx4通路机制研究

Exercise training mode effects on myokine expression in healthy adults:A systematic review with meta-analysis

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

Journal of Sport and Health Science 2024年第6期13卷 764-779页

作者： Francesco Bettariga Dennis R.Taaffe Daniel A.Galvao Pedro Lopez Chris Bishop Anna Maria Markarian Valentina Natalucci Jin-Soo kim Robert U.Newton Exercise Medicine Research Institute Edith Cowan UniversityJoondalupWA 6027Australia School of Medical and Health Sciences Edith Cowan UniversityJoondalupWA 6027Australia Pleural Medicine Unit Institute for Respiratory HealthPerthWA 6009Australia Medical School Faculty of Health&Medical SciencesUniversity of Western AustraliaPerthWA 6009Australia Grupo de Pesquisa em Exercicio para Populacoes Clinicas(GPCLIN) Universidade de Caxias do SulCaxias do SulRio Grande do Sul 95070-560Brazil London Sport Institute School of Science and TechnologyMiddlesex UniversityLondonNW44BTUK Department of Pathophysiology and Transplantation University of MilanMilan 20133Italy School of Human Movement and Nutrition Sciences University of QueenslandSt.LuciaQLD 4072Australia

Background:The benefits of exercise are well known;however,many of the underlying molecular mechanisms are not fully *** muscle secretes myokines,which mediate muscleorgan *** regulate satellite-cell proliferation and migration,inflammatory cascade,insulin secretion,angiogenesis,fatty oxidation,and cancer *** date,the effects of different exercise modes(namely,aerobic and resistance exercise)on myokine response remain to be *** is crucial considering the clinical implementation of exercise to enhance general health and wellbeing and as a medical ***:A systematic search was undertaken in PubMed,MEDLINE,CINAHL,Embase,SPORTDiscus,andWeb of Science in April *** studies examining the effects of a single bout of exercise on interleukin15(IL-15),irisin,secreted protein acidic and rich in cysteine(SPARC),oncostatinM(OSM),and decorin were included.A random-effects meta-analysis was also undertaken to quantify the magnitude of ***:Sixty-two studies were included(n=1193).Overall,exercise appeared to induce small to large increases in myokine expression,with effects observed immediately after to 60 min post-exercise,although these were mostly not statistically *** aerobic and resistance exercise resulted in changes in myokine levels,without any significant difference between training modes,and with the magnitude of change differing across *** levels returned to baseline levels within 180 min to 24 h ***,owing to potential sources of heterogeneity,most changes were not statistically significant,indicating that precise conclusions cannot be ***:Knowledge is limited but expanding with respect to the impact of overall and specific effects of exercise on myokine expression at different time points in the systemic *** research is required to investigate the effects of different exercise modes at multiple time points on myok

关键词： Myokine Resistance exercise Aerobic exercise Cytokine Systemic circulation

Flux Vector Splitting Schemes for Water Hammer Flows in Pumping Supply Systems with Air Vessels

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2015年第3期22卷 69-74页

作者： Qiang sun Yuebin Wu Ying Xu Tae uk Jang School of Municipal & Environmental Engineering Harbin Institute of Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology School of Energy and Architecture Harbin University of Commerce Department of Mechanics Kim II-Sung University

To solve water hammer problems in pipeline systems,many numerical simulation approaches have been developed. This paper improves a flux vector splitting( FVS) scheme whose grid is the same as the fixedgrid MOC scheme. The proposed FVS scheme is used to analyze water hammer problems caused by a pump abrupt shutdown in a pumping system with an air vessel. This paper also proposes a pump-valve-vessel model combining a pump-valve model with an air vessel model. The results show that the data obtained by the FVS scheme are similar to the ones obtained by the fixed-grid method of characteristics( MOC). And the results using the pump-valve-vessel model are almost the same as the ones using both the pump-valve model and the air vessel model. Therefore,it is effective that the proposed FVS scheme is used to solve water hammer problems and the pump-valve-vessel model replaces both the pump-valve model and the air vessel model to simulate water hammer flows in the pumping system with the air vessel.

关键词： water hammer method of characteristics flux vector splitting air vessel

Fournier’s gangrene after insertion of thermo-expandable prostatic stent for benign prostatic hyperplasia:A case report

在线全文

学校读者我要写书评

暂无评论

世界临床病例杂志 2023年第27期11卷 6498-6504页

作者： Hee Chang Jung Yeong uk kim Department of Urology Yeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Thermo-expandable urethral stent(Memokath 028)implantation is an alternative treatment for older patients with lower urinary tract symptoms and benign prostatic *** prostatic urethral stent implantation,minor complications such as urinary tract infection,irritative symptoms,gross hematuria,and urethral pain have been observed;however,there are no reports of life-threatening ***,we report a critical case of Fournier’s gangrene that occurred 7 years after prostatic *** SUMMARY An 81-years-old man with benign prostatic hyperplasia(volume,126 ccs;as measured by transrectal ultrasound)had undergone insertion of a thermoexpandable urethral stent(Memokath 028)as he was unfit for surgery under general ***,the patient had undergone a suprapubic cystostomy for recurrent acute urinary retention 4 years after the insertion of prostatic stent(Memokath 028).We had planned to remove the Memokath 028;however,the patient was lost to *** patient presented to the emergency department 3 years after the suprapubic cystostomy with necrotic changes from the right scrotum to the right inguinal *** digital rectal examination,tenderness and heat of prostate was ***,the black skin color change with foulsmelling from right scrotum to right inguinal area was *** computed tomography finding,subcutaneous emphysema was identified to same *** was diagnosed with Fournier’s gangrene based on the physical examination and computed tomography *** emergency room,Fournier’s gangrene severity index value is seven ***,he underwent emergent extended surgical debridement and removal of the Memokath ***-spectrum intravenous antibiotics were administered and additional necrotic tissue debridement was ***,the patient died 14 days after surgery due to multiorgan *** If Memokath 028 for benign prostatic hyperplasia is not working in older patients,its rapid

关键词： Urethral stents Minimally invasive surgery Complication Fournier’s gangrene Benign prostatic hyperplasia Case report

ntestinal Duplication Cyst Misdiagnosed as Meckel＇s Diverticulum

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

Chinese Medical Journal 2016年第2期129卷 235-236页

作者： Yee-Suk kim Donn-Ju kim Seung-uk Bang Jun-Jae Park Department of Anesthesiology and Pain Medicine College of Medicine The Catholic University of Korea Seoul Republic of Korea Department of Surgery College of Medicine and Medical Research Institute The Chungbuk National University Chungbuk Republic of Korea

An intestinal duplication cyst is a very rare congenital anomaly, with symptoms including abdominal pain, abdominal distention, intestinal bleeding, and hematochezia. Hematochezia can be caused by ectopic gastric mucosa, although there are other causes of infantile hematochezia; hence, an intestinal duplication cyst can be misdiagnosed as bowel intussusception or Meckel＇s diverticulum. Here, a case of an intestinal duplication cyst that was misdiagnosed as Meckel＇s diverticulum is reported.

关键词： Duplication Cyst Gastrointestinal Hemorrhage Meckel's Diverticulum

Phylogenetic relationship,biogeography,and conservation genetics of endangered Fraxinus chiisanensis(Oleaceae),endemic to South Korea

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2022年第2期44卷 170-180页

作者： Changkyun kim Dong-Kap kim Hang sun Joo-Hwan kim Plant Research Division Honam National Institute of Biological ResourcesMokpo 58762Republic of Korea Forest Biodiversity Division Korea National ArboretumPocheon 11186Republic of Korea CAS Key Laboratory for Plant Biodiversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650204YunnanPR China Department of Life Science Gachon UniversitySeongnam 13120Republic of Korea

Endemic plants are important for understanding phylogenetic relationships,biogeographical history,and genetic variation because of their restricted distribution and their role in conserving ***,we investigated the phylogenetic relationships of the Korean endemic Fraxinus chiisanensis by reconstructing the molecular phylogeny of Fraxinus based on two nuclear DNA(nrITS and phantastica)and two chloroplast DNA(psbA-trnH and rp132-trnL)*** our fossil-calibrated phylogenetic framework,we also inferred the biogeographical history of *** provide a scientific basis for the conservation of ***,we determined the levels of genetic diversity and genetic differentiation in this *** information from nuclear and chloroplast DNA sequence data,our molecular phylogenetic analyses identified *** as a genetically distinct unit from its sister group,Fraxinus platypoda from *** molecular dating analyses using nuclear and chloroplast DNA data sets show *** diverged from its sister *** in the Early or Middle Miocene and differentiated in the Late Miocene on the Korean *** results suggest that the divergence of *** was associated with the submergence of the East China Sea land bridge and enhanced monsoons in East *** compared to ***,*** exhibits low genetic diversity within populations and high genetic differentiation among *** results help us to understand the evolutionary history of *** and to develop a conservation strategy for this species.

关键词： East China Sea land bridge Endemic species Fraxinus chiisanensis Korean Peninsula Genetic diversity Biogeography

Replica higher-order topology of Hofstadter butterflies in twisted bilayer graphene

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 783-791页

作者： sun-Woo kim sunam Jeon Moon Jip Park Youngkuk kim Department of Physics KAISTDaejeonRepublic of Korea Department of Materials Science and Metallurgy University of CambridgeCambridgeUK Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea Center for Theoretical Physics of Complex Systems Institute for Basic Science(IBS)DaejeonRepublic of Korea Department of Physics Hanyang UniversitySeoulRepublic of Korea Department of Physics Sungkyunkwan UniversitySuwonRepublic of Korea

The Hofstadter energy spectrum of twisted bilayer graphene(TBG)is found to have recursive higher-order topological *** demonstrate that higher-order topological insulator(HOTI)phases,characterized by localized corner states,occur as replicas of the original HOTIs to fulfill the self-similarity of the Hofstadter *** show the existence of exact flux translational symmetry in TBG at all commensurate *** on this result,we identify that the original HOTI phase at zero flux is re-entrant at a half-flux periodicity,where the effective twofold rotation is *** addition,numerous replicas of the original HOTIs are found for fluxes without protecting *** the original HOTIs,replica HOTIs feature both localized corner states and edge-localized real-space topological *** replica HOTIs originate from the different interaction scales,namely,intralayer and interlayer couplings,in *** topological aspect of Hofstadter butterflies revealed in our results highlights symmetry-protected topology in quantum fractals.

关键词： properties spectrum topological