检索结果-南通市图书馆

Modification of residual stress in Al-[AlBO]_w/Al compound plate

在线全文

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 2001年第2期11卷 275-277页

作者：姜传海吴建生王德尊 Shanghai Jiao Tong Univ Key Lab High Temp Mat & Tests Minist Educ Shanghai 200030 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The application of compound parts of Al [AlBO] w/Al not only reduces the cost of the parts but also improves its properties. However, there is a large thermal residual stress between Al and [AlBO] w/Al, and it is harmful for practical application. From the theoretical analyses and experimental results, it was found that by the compressive pre plastic deformation perpendicular to the interface between Al and [AlBO] w/Al, the interlayer residual stress of compound parts can be reduced, while the mechanical properties of compound parts can be improved. [

关键词： Al [AlBO] w/Al compound plate residual stress

Huoxin Pill(活心丸)Attenuates Cardiac Fibrosis by Suppressing TGF-β1/Smad2/3 Pathway in Isoproterenol-Induced Heart Failure Rats

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2021年第6期27卷 424-431页

作者： PENG Mei-zhong YANG Mei-ling SHEN A-ling ZHOU Xue-ling LU Yan LI Qi SHEN Zhi-qing HUANG Bin PENG Jun CHU Jian-feng Academy of Integrative Medicine Fujian University of Traditional Chinese MedicineFuzhou(350122)China Chen Keji Academic Thought Inheritance Studio Fujian University of Traditional Chinese MedicineFuzhou(350122)China Fujian Key Laboratory of Integrative Medicine on Geriatrics Fujian University of Traditional Chinese MedicineFuzhou(350122)China The Third People's Hospital Affiliated to Fujian University of Traditional Chinese Medicine Fuzhou(350122)China Department of Research and Development Youcare Pharmaceutical Group Co.Ltd.Beijing(100176)China

Objective:To evaluate the effects of Huoxin Pill(活心丸,HXP)on cardiac fibrosis and heart failure(HF)in isoproterenol(ISO)-induced HF ***:Thirty Wistar rats were randomly divided into 5 groups including control,HF,isosorbide mononitrate(ISMN),HXP low(HXP-L),and HXP high(HXP-H)groups(n=6 for each group)according to the complete randomization *** were pretreated with ISMN(5 mg/kg daily),low concentration of HXP(10 mg/kg daily)or high concentration of HXP(30 mg/kg daily)or equal volume of saline by intragastric administration for 1 week,followed by intraperitoneal injection of ISO(10 mg/kg,14 days),and continually intragastric administrated with above medicines or saline for additional 6 *** effects of HXP treatment on the cardiac function,heart weight index(HWI),pathological changes,and collagen content were further ***,the role of HXP on activation of transforming growth factor-β1(TGF-β1)/Smads pathway was further explored using immunohistochemistry(IHC)and Westernblot ***:HXP treatment significantly alleviated the decrease of ejection fraction(EF)and fractional shortening(FS),while decreased the elevation of left ventricular end-systolic volume(LVESV)in ISO-induced HF rats(P<0.05).Moreover,HXP treatment obviously attenuated the increase of HWI and serum level of creatine kinase MB(CK-MB,P<0.05),as well as pathological changes in ISO-induced HF *** determination indicated that HXP treatment alleviated the elevation of collagenⅠand collagenⅢprotein expression in cardiac tissues of ISO-induced HF ***,HXP treatment significantly down-regulated the increase of TGF-β1 and p-Smad2/3 protein expression in cardiac tissues of HF rats(P<0.05),while did not affect the expression of total Smad2/***:HXP attenuated heart failure and cardiac fibrosis in ISO-induced HF rats by suppression of TGF-β1/Smad2/3 pathway.

关键词： Huoxin Pill heart failure cardiac fibrosis isoproterenol TGF-β1/Smad2/3 pathway

在线全文

学校读者我要写书评

暂无评论

小尺寸sic的制备及其电化学析氢性能研究

现代化工 2020年第6期40卷 95-97页

作者：白改玲童希立太原工业学院材料工程系山西太原030008 中国科学院山西煤炭化学研究所煤转化国家重点实验室山西太原030001

将sic纳米材料在浓酸中加热腐蚀制备得到小尺寸sic颗粒,并在其上电沉积Pt后制备得到Pt/sic复合材料。利用X射线衍射仪、透射电子显微镜和电化学测试等手段对复合材料的组成、结构和电化学性能进行表征。结果表明,sic-4颗粒直径为几nm左... 详细信息

将sic纳米材料在浓酸中加热腐蚀制备得到小尺寸sic颗粒,并在其上电沉积Pt后制备得到Pt/sic复合材料。利用X射线衍射仪、透射电子显微镜和电化学测试等手段对复合材料的组成、结构和电化学性能进行表征。结果表明,sic-4颗粒直径为几nm左右,具有较好的自催化析氢性能,Pt/sic-4具有优异的HER性能;电流密度为10 mA/cm^2时的过电位为75 mV,电流密度为100 mA/cm^2时的过电位为212 mV,Tafel值为37.57 mV/dec,双层电容值为1.56 mF/cm^2。

关键词： sic 小尺寸电化学析氢

Synthesis and characteristics of sic whiskers with "rosary bead" morphology

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2004年第1期23卷 37-37页

作者： JIA Xian and ling Xiaomei

sic whiskers with "rosary bead" morphology were synthesized using suitable silicon source and carbon source through solid reaction at the temperature above 1537 K. The diameter and length of the sic whiskers were about 0.1-1.0 μm and 20-100 μm, respectively. The largest diameter of their enlarged ends of the whiskers was about 0.2-1.0μm, and it gradually and smoothly decreased to the size of the plain part of the whiskers. The results of X-ray diffraction analysis show that the crystalline structure of the obtained sic whiskers is β-sic. It is considered that the sic whiskers grow via a vapor-solid mechanism.

关键词： sic whisker synthesis crystalline structure

烧结助剂对HfB_2-sic基超高温陶瓷组织和性能的影响研究

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2007年第A02期36卷 16-19页

作者：翁凌张幸红韩文波哈尔滨工业大学复合材料与结构研究所黑龙江哈尔滨150080

采用热压烧结工艺制备出HfB_2-20%sic(HS)、HfB_2-20%sic-5%Si_3N4(HSS)和HfB_2-20%sic-5%AIN(HSA) (体积分数,下同)3种超高温陶瓷基复合材料,对材料进行了微结构表征和力学性能测试,并对Si_3N_4、AIN烧结助剂的作用机理进行了初步分析... 详细信息

采用热压烧结工艺制备出HfB_2-20%sic(HS)、HfB_2-20%sic-5%Si_3N4(HSS)和HfB_2-20%sic-5%AIN(HSA) (体积分数,下同)3种超高温陶瓷基复合材料,对材料进行了微结构表征和力学性能测试,并对Si_3N_4、AIN烧结助剂的作用机理进行了初步分析。结果表明,与HfB_2-20%sic相比,Si_3N_4和AIN烧结助剂的引入使材料的烧结温度从2200℃降低到1850℃,相对密度从95%提高到99%左右。材料的平均晶粒尺寸显著降低,形成了相应的晶粒边界相。力学性能测试结果表明,HfB_2-20%sic-5%Si_3N_4和HfB_2-20%sic-5%AIN的抗弯强度和断裂韧性均比HfB_2-20%sic获得一定程度的提高。烧结助剂的引入使sic/HfB_2超高温陶瓷材料的断裂模式从单纯的穿晶断裂转变为穿晶/沿晶混合的断裂模式。

关键词： HfB2基超高温陶瓷热压烧结烧结助剂

Incidence,prognosis,and risk factors of sepsis-induced cardiomyopathy

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第31期9卷 9452-9468页

作者： Yan-Wen Liang You-Feng Zhu Rui Zhang Min Zhang Xiao-ling Ye Jian-Rui Wei Department of Intensive Care Unit Guangzhou Red Cross HospitalGuangzhou 510220Guangdong ProvinceChina Department of Geriatrics The Affiliated Hospital of Qingdao UniversityQingdao 270000Shandong ProvinceChina Guangzhou Women and Children’s Medical Center Guangzhou 510000Guangdong ProvinceChina

BACKGROUND At present,large-scale studies on the clinical characteristics of sepsis-induced cardiomyopathy(sic)are *** To investigate the clinical characteristics of *** Based on the analysis of the MIMIC-III public database,we performed a largescale retrospective study involving sepsis patients who were admitted to the intensive care unit(ICU)and had no concomitant cardiac *** used propensity score matching analysis and multivariate logistic regression to ensure the robustness of the *** primary outcome was hospital mortality,and the secondary outcomes included the number of patients who received mechanical ventilation or renal replacement therapy during their hospital stay,the number of patients administered with vasopressors,the length of ICU stay,and the length of hospital *** In the present study,after screening 38605 patients,3530 patients with sepsis were included.A total of 997 patients met the sic diagnostic criteria,and the incidence of sic was 28.20%(95%confidence interval[CI]:26.80%-29.70%).Compared to patients in the non-sic group,patients in the sic group were of older age and had a higher Simplified Acute Physiology Score(SAPS)-Ⅰ score,SAPS-Ⅱ score,and Elixhauser comorbidity index(ECI).A total of 367(36.8%)of 997 patients in the sic group and 818(32.3%)of 2533 patients in the non-sic group died in the hospital,which resulted in a significant between-group difference(odds ratios=1.22,95%CI:1.05-1.42;P=0.011).For the secondary outcomes,more patients in the sic group received mechanical ventilation and *** logistic regression analysis showed that age,male sex,ECI,hemoglobin level,diabetes,and mechanical ventilation use on the first day of ICU admission were risk factors for *** Compared with non-sic patients,hospital mortality is higher in sic patients.

关键词： Sepsis-induced cardiomyopathy Sepsis Septic shock Incidence Hospital mortality MIMIC-Ⅲ

Temperature dependence of Raman scattering in n-type 6H-sic

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

Temperature dependence of Raman scattering in n-type 6H-SiC

High quality 2-μm GaSb-based optically pumped semiconductor disk laser grown by molecular beam epitaxy

第十七届全国光散射学术会议

作者： Hong Chao Wang Hua Yang Sun Ting Mei Zhi Ren Qiu Zhe chuan Feng Institute of Optoelectronic Material and Technology South China Normal University State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering Sun Yat-Sen University Institute of Photonics and Optoelectronics Department of Electrical Engineering and Center for Emerging Material and Advanced DevicesNational Taiwan University

＜正＞Silicon carbide（sic）,one of the oldest known semiconductor materials,has recently been the focus of much materials research due to its excellent physical and chemical properties such as high thermal conductivity, extremely high hardness,high saturated electron drift velocity and high break down electric ***, sic which is a wide band gap semiconductor with an indirect band structure is an attractive material for

关键词：

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

Chinese Physics B 2019年第3期28卷 175-179页

作者： Jin-Ming Shang Jian Feng Cheng-Ao Yang Sheng-Wen Xie Yi Zhang Cun-Zhu Tong Yu Zhang Zhi-chuan Niu State Key Laboratory for Superlattice and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083china Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The epitaxial growth conditions and performance of a diode-pumped GaSb-based optically pumped semiconductor disk laser(SDL) emitting near 2.0 μm in an external cavity configuration are reported. The high quality epitaxial structure,grown on Te-doped(001) oriented GaSb substrate by molecular beam epitaxy, consists of a distributed Bragg reflector(DBR), a multi-quantum-well gain region, and a window layer. An intra-cavity sic heat spreader was attached to the gain chip for effective thermal management. A continuous-wave output power of over 1 W operating at 2.03 μm wavelength operating near room temperature was achieved using a 3% output coupler.

关键词： semiconductor disk laser GaSb molecular beam epitaxy

Revealing the Structure-Property Difference of Natural Rubber Prepared by Different Methods: Protein and Gel Content are Key Factors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第4期42卷 457-467页

作者： Shao-Qi Huang Jun-Qi Zhang Yong Zhu ling-Min Kong Lu-Sheng Liao Fu-Quan Zhang Zheng-Tian Xie Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China Hainan Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang524001China

Natural rubber (NR) is widely used in various fields including aerospace, military industry and transportation due to its superior elasticity and comprehensive mechanical properties. Nonetheless, the commercial NR prepared by different methods usually exhibits different mechanical properties, primarily due to variations in processing conditions during the conversion from latex to bulk rubber material. Consequently, this poses challenges in scientific research and industrial production of NR. In order to assess the properties of various commercially available NR and identify key structural and compositional components, this study systematically compares and analyzes four representative NR raw materials: air dried sheet (ADS), ribbed smoked sheets (RSS), constant viscidity NR (CV), and whole field latex rubber (WF). The investigation focuses on evaluating their static mechanical behavior, sic behavior, wear resistance, and fatigue resistance. The findings indicate that protein and gel content exhibit a crucial influence on the NR properties. These constituents contribute to the formation of a high-crosslinking density region, generating a heterogeneous network structure within the rubber. This structure amplifies strains during deformation, leading to earlier and stronger strain-induced crystallization (sic). Among the four commercial NR brands, RSS demonstrates superior overall mechanical and dynamic properties owing to its high protein and gel content. This study serves as a valuable reference for comprehending the differences in properties among various commercial NR, thereby offering guidance for the actual processing and selection of NR.

关键词： Natural rubber Processingmethod Protein Gel content Property