检索结果-南通市图书馆

Mechanical strength and corrosion resistance of Al-additive friction stir welded AZ31B joints

Journal of Magnesium and Alloys 2023年第5期11卷 1519-1535页

作者： Jae-Yeon kim Eun-Woo kim Dong-O kim Eun-Kyo ju Ji-Eun Lee Jaeheon Lee Jai-Won Byeon Mining Engineering Department Colorado School of MinesGoldenCO 80401USA Department of Materials Science and Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

Compared to other structural alloys,magnesium alloys have a relatively poor corrosion resistance and low mechanical strength,which can be further deteriorated when these alloys are subjected to joining processes using the existing joining ***,we propose for the first time an additive friction stir-welding(AFSW)using fine Al powder as an additive to improve the mechanical strength as well as corrosion resistance of AZ31B weld *** is a solid-state welding method of forming a high-Al AZ31B joint via an in-situ reaction between pure Al powders filled in a machined groove and the AZ31B *** optimize the process parameters,AFSW was performed under different rotational and transverse speeds,and number of passes,using tools with a square or screw *** particular,to fabricate a weld zone,where the Al was homogenously dispersed,the effects of the groove shape were investigated using three types of grooves:surface one-line groove,surface-symmetric grooves,and inserted symmetric *** homogenous and defect-less AFS-welded AZ31B joint was successfully fabricated with the following optimal parameters:1400 rpm,25 mm/min,four passes,inserted symmetric grooves,and the tool with a square *** AFSW fully dissolved the additive Al intoα-Mg and in-situ precipitated Mg_(17)Al_(12)particles,which was confirmed via scanning electron microscopy,transmission electron microscope,and X-ray diffraction *** microhardness,joint efficiency,and elongation at the fracture point of the AFS-welded AZ31B joint were 80 HV,101%,and 8.9%,*** values are higher than those obtained for the FS-welded AZ31 joint in previous *** corrosion resistance of the AFS-welded AZ31B joint,evaluated via hydrogen evolution measurements and potentiodynamic polarization tests,was enhanced to 55%relative to the FS-welded AZ31B joint.

关键词： AZ31B magnesium alloy Additive friction stir-welding In-situ reaction Mg_(17)Al_(12)particles Joint efficiency Corrosion resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radial Pulse and Electrocardiography Modulation by Mild Thermal Stresses Applied to Feet: An Exploratory Study with Randomized, Crossover Design

引用

Chinese Journal of Integrative Medicine 2020年第4期26卷 299-306页

作者： Jang-Han Bae Boncho Ku Young ju Jeon Hyunho kim Jihye kim Haebeom Lee Jong Yeol kim Jaeuk U.kim Korea n Medici ne Fun dame ntal Research Divisi on Korea Institute of Oriental MedicineDaejeon(34054)Republic of Korea Department of Biofunctional Medicine and Diagnostics College of Korea n MedicineKyung Hee UniversitySeoul(02453)Republic of Korea Department of Human Informatics of Korean Medicine Interdisciplinary ProgramsKyung Hee UniversitySeoul(02453)Republic of Korea

Objective:To investigate the changes in radial pulse induced by thermal stresses(TSs).Methods:Sixty subjects were *** an open-label,2x2 crossover randomization design,both feet of each subject were immersed in 15%:water for cold stress(CS)and in 40 X:water for heat stress(HS)for 5 min *** pulse,respiration and electrocardiogram(ECG)signals were recorded before,during and immediately after the ***:The an alysis of heart rate variability revealed that CS in creased the low-freque ncy(LF)and high-frequency(HF)components(P<0.05)and that HS reduced the LF and HF components(P<0.01).Both TSs reduced the normalized LF,increased the normalized HF,and reduced the LF/HF *** differences in the ECG signals were more dominant during the TS sessions,but those in the radial pulse signals became more domi nant immediately after the TS sessi *** decreased the pulse depth(P<0.01)and in creased the radial augme ntation in dex(P<0.1),and HS in creased the pulse pressure(P<0.1)and sube ndocardial viability ratio(P<0.01).There were no significant differences in pulse rate during the three time sequences of each *** respiration rate was increased(P<0.1),and the pulse rate per respiration(P/R ratio)was significantly decreased(P<0.05)with *** HF region(10-30 Hz)of the pulse spectral density was suppressed during both ***:CS induced vasoconstriction and sympathetic reactions,and HS induced vasodilation and parasympathetic reacti *** on defi nitions used in pulse diag no sis,we made the novel discoveries that the pulse became slower(decreased P/R ratio),more floating and tenser under CS and that the HF region of the spectral power decreased significantly under both TSs.

关键词： radial pulse pulse diag no sis thermal stress electrocardiography heart rate variability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extremely rare case of necrotizing gastritis in a patient with autoimmune hepatitis: A case report

引用

World Journal of Clinical Cases 2021年第14期9卷 3472-3477页

作者： Seung Ki Moon Jeong-ju Yoo Sang Gyune kim Young Seok kim Department of Internal Medicine Soonchunhyang University Bucheon HospitalBucheon 14584South Korea Department of Gastroenterology and Hepatology Soonchunhyang University School of MedicineBucheon 14584South Korea

BACKGROUND Autoimmune hepatitis can cause liver fibrosis,liver cirrhosis,and hepatocellular *** treatment option include the use of steroids and/or immunesuppressive agents such as ***,these drugs have some side ***,close follow-up is needed during ***,we present an extremely rare case of a patient with an autoimmune hepatitis who died from necrotizing gastritis during immunosuppressive *** SUMMARY A 52-year-old female patient was diagnosed with autoimmune *** treated this patient with immunosuppressive ***-dose steroid treatment was initially *** azathioprine treatment was added while steroid was *** weeks after the start of treatment,she visited the emergency room due to generalized abdominal pain and *** computed tomography scan,the patient was diagnosed with necrotizing gastritis and the patient progressed to septic *** for sepsis was continued in the intensive care ***,the patient died at 6 h after admission to the emergency *** In patients with autoimmune infections undergoing immunosuppressant therapy,rare complications such as necrotizing gastritis may occur,thus requiring clinical attention.

关键词： Autoimmune hepatitis Azathioprine Case report

来源：

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

Alleviating Interfacial Recombination of Heterojunction Electron Transport Layer via Oxygen Vacancy Engineering for Efficient Perovskite Solar Cells Over 23%

引用

Energy & Environmental Materials 2023年第2期6卷 311-322页

作者： Yohan Ko Taemin kim Chanyong Lee Changhyun Lee Yong ju Yun Yongseok jun Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Korea

Electron transport layer(ETL)is pivotal to charge carrier transport for PSCs to reach the Shockley-Queisser *** study provides a fundamental understanding of heterojunction electron transport layers(ETLs)at the atomic level for stable and efficient perovskite solar cells(PSCs).The bilayer structure of an ETL composed of SnO_(2) on TiO_(2) was examined,revealing a critical factor limiting its potential to obtain efficient *** of oxygen vacancies in the TiO_(2) underlayer via an annealing process is found to induce manipulated band offsets at the interface between the TiO_(2) and SnO_(2) ***-depth electronic investigations of the bilayer structure elucidate the importance of the electronic properties at the interface between the TiO_(2) and SnO_(2) *** apparent correlation in hysteresis phenomena,including current density-voltage(J-V)curves,appears as a function of the type of band *** functional theory calculations reveal the intimate relationship between oxygen vacancies,deep trap states,and charge transport efficiency at the interface between the TiO_(2) and SnO_(2) *** formation of cascade band alignment via control over the TiO_(2) underlayer enhances device performance and suppresses *** performance exhibits a power conversion efficiency(PCE)of 23.45%with an open-circuit voltage(V_(oc))of 1.184 V,showing better device stability under maximum power point tracking compared with a staggered bilayer under one-sun continuous illumination.

关键词： electron transport bilayer heterojunction bilayers interfacial defect oxygen vacancy engineering perovskite solar cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Understanding acute kidney injury (AKI) in liver cirrhosis from the acute-on-chronic liver failure (ACLF) perspective

引用

Hepatobiliary Surgery and Nutrition 2024年第4期13卷 715-717页

作者： Jeong-ju Yoo Sang Gyune kim Division of Gastroenterology and Hepatology Department of Internal MedicineSoonchunhyang University School of Medicine Bucheon HospitalBucheonKorea

In the field of hepatology,managing complications in patients with liver diseases is of paramount *** these,acute kidney injury(AKI)in patients with acute-on-chronic liver failure(ACLF)stands out due to its prevalence and significant impact on patient outcomes(1,2).AKI in ACLF differs substantially from AKI in simple liver cirrhosis in its clinical significance(3).AKI developed in ACLF is a manifestation of a multi-organ failure syndrome and is closely associated with a high mortality rate and severe complications.

关键词： Acute kidney injury(AKI) acute-on-chronic liver failure(ACLF) biomarker

来源：

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

Rare case of hepatocellular carcinoma metastasis to urinary bladder:A case report

引用

World Journal of Clinical Cases 2022年第16期10卷 5470-5478页

作者： Yohan kim Young Seok kim Jeong-ju Yoo Sang Gyune kim Susie Chin Ahrim Moon Department of Gastroenterology Soonchunhyang University Hospital BucheonBucheon B14200202Gyeonggi-doSouth Korea Division of Gastroenterology and Hepatology Department of Internal MedicineSoonchunhyang University Bucheon HospitalBucheon B14200202Gyeonggi-doSouth Korea Department of Pathology Soonchunhyang University Bucheon HospitalBucheon B14200202Gyeonggi-doSouth Korea Department of Pathology Soonchunhyang University Bucheon HospitalSoonchunhyang University College of MedicineBucheon B14200202Gyeonggi-doSouth Korea

BACKGROUND Hepatocellular carcinoma(HCC)is a primary liver cancer with high prevalence and *** are many cases of advanced HCC at the time of *** methods and prognosis are different depends on whether metastasis is ***,it is necessary to make an accurate evaluation at the time of *** metastases of HCC usually occur through hematogenous spread or through adjacent organs such as the *** to the urinary bladder alone is ***,we report a rare case of biopsy-proven solitary metastasis of HCC to the bladder in a 60-year-old *** SUMMARY A 60-year-old female patient was found to be positive for hepatitis B surface antigen by chance after abdominal ultrasonography showed abnormal ***,liver dynamic computed tomography(CT)was *** patient visited the hospital for further *** and CT showed 3.6 cm sized arterial enhancing mass in segment 5 and an infiltrative mass in segment *** patient was diagnosed with HCC through liver dynamic magnetic resonance imaging and liver ***,she underwent two transcatheter arterial chemoembolizations within five months for *** follow-up,a newly appeared bladder tumor was found on liver dynamic *** underwent transurethral resection of the bladder tumor for diagnosis and *** tissue was confirmed as metastatic *** Although rare,metastasis to urinary bladder from HCC can occur without evidence of other distant ***,regular follow-up imaging examination and clinical attention are required.

关键词： Hepatocellular carcinoma Metastasis Urinary bladder Case report

来源：

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

Microstructure and Mechanical Properties of Hybrid Laser-Friction Stir Welding between AA6061-T6 Al Alloy and AZ31 Mg Alloy

引用

Journal of Materials Science & Technology 2011年第3期27卷 199-204页

作者： Woong-Seong Chang S.R.Rajesh Chang-Keun Chun Heung-ju kim Welding Research Center Research Institute of Industrial Science and Technology

For the purpose of improving the strength of this dissimilarjoint, the present study was carried out to investigate the improvement in intermetallic layer by using a third material foil between the laying edges of the friction stir welded and hybrid welded AI6061-T6/AZ31 alloy plates. The difference in microstructural and mechanical characteristics of friction stir welded and hybrid welded AI6061-TO/AZ31 joint was compared. Hybrid butt- welding of aluminum alloy plate to a magnesium alloy plate was successfully achieved with Ni foil as filler material, while defect-free laser-friction stir welding （FSW） hybrid welding was achieved by using a laser power of 2 kW. Transverse tensile strength of the joint reached about 66% of the Mg base metal tensile strength in the case of hybrid welding with Ni foil and showed higher value than that of the friction stir welded joint with and without the third material foil. This may be due to the presence of less brittle Ni-based intermetallic phases instead of Al12Mg17.

关键词： Frictions stir welding Laser welding Dissimilar metal joint Hybrid welding Magnesium alloy Aluminum alloy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction of Cold and Heat Patterns Using Anthropometric Measures Based on Machine Learning

引用

Chinese Journal of Integrative Medicine 2018年第1期24卷 16-23页

作者： Bum ju Lee Jae Chul Lee Jiho Nam Jong Yeol kim Medical Research Division Korea Institute of Oriental Medicine

Objective： To examine the association of body shape with cold and heat patterns, to determine which anthropometric measure is the best indicator for discriminating between the two patterns, and to investigate whether using a combination of measures can improve the predictive power to diagnose these patterns. Methods： Based on a total of 4,859 subjects （3,000 women and 1,859 men）, statistical analyses using binary logistic regression were performed to assess the significance of the difference and the predictive power of each anthropometric measure, and binary logistic regression and Naive Bayes with the variable selection technique were used to assess the improvement in the predictive power of the patterns using the combined measures. Results： In women, the strongest indicators for determining the cold and heat patterns among anthropometric measures were body mass index （BMI） and rib circumference; in men, the best indicator was BMI. In experiments using a combination of measures, the values of the area under the receiver operating characteristic curve in women were 0.776 by Naive Bayes and 0.772 by logistic regression, and the values in men were 0.788 by Naive Bayes and 0.779 by logistic regression. Conclusions： Individuals with a higher BMI have a tendency toward a heat pattern in both women and men. The use of a combination of anthropometric measures can slightly improve the diagnostic accuracy. Our findings can provide fundamental information for the diagnosis of cold and heat patterns based on body shape for personalized medicine.

关键词： cold and heat patterns personalized medicine cold syndrome predictive power machine learning data mining

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation and Characterization of Porous PVdF-HFP/clay Nanocomposite Membranes

引用

Journal of Materials Science & Technology 2010年第7期26卷 633-638页

作者： Mi Jin Koh Hae Young Hwang Deuk ju kim Hyeng jun kim Young Taik Hong Sang Yong Nam School of Materials Science and Engineering Engineering Research Institutei-Cube CenterGyeongsang National UniversityJinjuKorea Fuel Cell Research Center Korea Institute of Science and TechnologySeoul 136-791Korea Energy Material Research Center Korea Research Institute of Chemical TechnologyDaejeon 305-600Korea

Polyvinylidene fluoride-hexafluoropropylene （PVdF-HFP） / clay nanocomposite membranes were prepared by phase inversion method through controlling retention time to apply for a lithium ion secondary batteries. Increased membrane porosity with macrovoids was observed at increasing retention time. Partially intercalated structures of PVdF-HFP/clay nanocomposite membranes were confirmed by X-ray diffraction （XRD） analysis. PVdF-HFP membranes containing various kind of clay showed the increase of membrane modulus compared to the pristine PVdF-HFP membrane.

关键词： PVdF-HFP Porosity Mechanical properties Clay Separator

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and characterization of Ba(Co_xNb_(1-x))O_3 nanoparticles by hydrothermal processing

引用

中国有色金属学会会刊：英文版 2009年第B9期19卷 92-95页

作者： Hyun-ju kim Min-Cheol CHU Seong-Jai CHO Dong-Sik BAE School of Nano & Advanced Materials Engineering Changwon National University Materials Evaluation Center Korea Research Institute of Standards and Science

The nanosized Ba(CoxNb1-x)O3(BCN) particles were prepared under high temperature and pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. Ba(CoxNb1-x)O3 powders were obtained in the temperature range of 170-210 ℃ for 6 h. The results show that the average size of the synthesized particles increases with increasing reaction temperature. The average size of the synthesized particles is about 10 nm. The crystalline phase of the synthesized particles is found to be Ba(CoxNb1-x)O3. Ceramics derived from the nano BCN powders could achieve high sintering density at a relatively low sintering temperature.

关键词：纳米粒子合成臭氧热加工表征平均粒径烧结温度氢氧化钾

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：