检索结果-南通市图书馆

Evaluation of microstructure and mechanical properties of Mg-xCe-0.5Zn alloys by nano-indentation

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1240-1243页

作者： K.C.park B.h.KIM y.h.park I.M.park Department of Material Science and Engineering Pusan National UniversitySan 30 Jangjeon-dongGeumjeong-guBusan 609-735Korea

The microstructure and mechanical properties of Mg-xCe-0.5Zn （x=0.5, 1.5, 2.5, molar fraction, %） alloys were examined using a nano-indentation technique. The alloys were fabricated using a vacuum induction melting method under an argon atmosphere The microstruetures of Mg-xCe-0.5Zn alloys mainly consist ofa-Mg and eutectic Mg12Ce phase. The volume fraction and size of the eutectic Mgl2Ce phase increase with increasing Ce contents. Nano-indentation test results show that the indentation hardness and elastic modulus of the eutectic Mg12Ce phase are higher than those of the a-Mg matrix. In addition, the mean indentation hardness and elastic modulus of the Mg-xCe-0.5Zn alloys increase with the Ce addition amount increasing.

关键词： Mg alloys Mg-Ce-Zn rare earth microstructure mechanical properties nano-indentation

Optimization of a fermented pumpkin-based beverage to improve Lactobacillus mali survival and-glucosidase inhibitory activity:A response surface methodology approach

在线全文

学校读者我要写书评

暂无评论

Food Science and human Wellness 2018年第1期7卷 57-70页

作者： W.y.Koh U.Uthumporn A.Rosma A.R.Irfan y.h.park Food Technology Division School of Industrial TechnologyUniversiti Sains MalaysiaMinden 11800PenangMalaysia Bioprocess Division School of Industrial TechnologyUniversiti Sains MalaysiaMinden 11800PenangMalaysia Department of Applied Microbiology and Biotechnology Yeungnam UniversityGyeongsanSouth Korea

The aim of this research was to develop an optimum fermentation and composition model for a new fermented pumpkin-based beverage with high probiotic survival and-glucosidase inhibitory *** between fermentation temperature,inoculum and ingredient concentration with response variables(fermentation time at the fermentation endpoint ph 4.5,survival rate of Lactobacillus mali K8 in pumpkin-based beverage treated with simulated gastrointestinal tract enzyme fluids,-glucosidase inhibitory activity and sensory overall acceptability after 4 weeks of refrigerated storage)was investigated using response surface *** formulation was obtained at an approximation of 40%pumpkin puree concentration,8 Log CFU/mL inoculum and at 35℃.The product derived from this optimum formula reached the fermentation endpoint after 28.34±0.10 h and the quality change during 4 weeks storage was *** product achieved 88.56±0.67%of *** survival after treatment with simulated gastric and intestinal juices;demonstrated 95.89±0.30% α-glucosidase inhibitory activity,as well as scored 6.99±0.40 on sensory overall acceptability after 4 weeks of *** findings illustrated that the model is effective in improving probiotic survival and α-glucosidase inhibitory activity with excellent sensory acceptability,thus may offer a dietary means for the management of hyperglycaemia.

关键词： Probiotics Response surface methodology Box-Behnken hyperglycaemia Functional food

MICROSTRUCTURE AND MEChANICAL PROPERTIES OFP/M TiAl ALLOyS AND ThE TEMPERATURE EFFECT

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1998年第6期11卷 417-424页

作者： Z.M.Sun h.hashimoto S.Sumi y.h.park T.Abe Z.h.Shan Tohoku Natl Industrial Research Inst Sendai Japan

Two intermetallic compounds of Ti-50at.%Al and Ti-48at.%Al-2at.%Cr were prepared with a mechanical alloying and pulse discharge sintering process. The as-sintered material shows a microstructure of equiaxed gamma grain with sub-micron size. heat treatments in Vacuum at different temperatures up to 1573 K were conducted on the sintered materials. The microstructure of the material coarsened considerably after heat treatment at temperatures higher than 1523 K. The mechanical properties of the as-sintered and the heat treated materials were measured at temperatures up to 973 K, with four-point bending tests. Experimental results indicate that the addition of Cr increases the fracture strength of the intermetallic compound at room temperature and at elevated temperatures as well. The bending fracture strength increases with increasing testing temperature up to about 873 K and a decrease following up. Both fracture strength and fracture strain of the material were found to be improved by heat treatment. (Edited author abstract) 10 Refs.

关键词： titanium aluminide mechanical alloying heat treatment mechanical property temperature

Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第1期27卷 93-96页

作者： B.h.Kim N.h.Kang W.T.Oh C.h.Kim J.h.Kim y.S.Kim y.h.park Department of Materials Science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining Technology Team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area Technology Service KITECHJisa-dongGanseo-guBusan 618-230Korea

For Al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear *** the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion ***,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave ***,the continuity of cracks and porosities played a key role to determine the ***,the weaving width was also the important parameter to control the ***,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（hAZ）,respectively,than the convex part.

关键词： Weaving laser Weld microstructure Void Al alloy

钆塞酸二钠增强MRI评估单发肝细胞癌病人的术后转归：风险评分系统的建立和验证

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2023年第4期 490-491页

作者： S.h.park B.Kim S.Kim S.park y.h.park S.K.Shin 周朝阳

摘要目的建立并验证基于钆塞酸二钠增强的肝脏MRI特征和临床因素的风险评分系统，预测单发肝细胞癌（hCC）无复发生存期（RFS）。方法回顾性纳入2个中心接受

关键词：

超声内镜下实时彩色多普勒血流成像鉴别肿瘤性及非肿瘤性胆囊息肉的诊断效能

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2018年第4期 489-489页

作者： S.y.Kim J.h.Cho E.J.Kim D.h.Chung K.K.Kim y.h.park 郑孝飞 Division of Gastroenterology Department of Internal MedicineGachon UniversityGil Medical Center

目的评价实时彩色多普勒血流(CDF)超声内镜(EUS)对肿瘤及非肿瘤性胆囊息肉的鉴别诊断价值。方法这项前瞻性研究自2014年8月—2016年12月连续纳入共233例胆囊息肉病人,均接受实时CDF-EUS检查。CDF成像对每例病人进行主观分类:强CDF模式、... 详细信息

目的评价实时彩色多普勒血流(CDF)超声内镜(EUS)对肿瘤及非肿瘤性胆囊息肉的鉴别诊断价值。方法这项前瞻性研究自2014年8月—2016年12月连续纳入共233例胆囊息肉病人,均接受实时CDF-EUS检查。CDF成像对每例病人进行主观分类:强CDF模式、弱CDF模式和无CDF模式。结果这233例病人中115例接受了手术切除,其中90例非肿瘤性胆囊息肉,23例肿瘤性胆囊息肉。多变量分析显示,强CDF模式是肿瘤性息肉最重要的预测因素;敏感度、特异度、阳性预测值、阴性预测值和准确度分别为52.2%、79.4%、38.7%、86.9%和73.9%。孤立性息肉和息肉大小与肿瘤风险增加有关。结论 EUS显示强CDF模式、孤立以及较大的息肉可以用来预测肿瘤性胆囊息肉。由于实时CDF-EUS安全无创,无需额外设备,因此很可能成为鉴别诊断胆囊息肉的补充检查。

关键词：胆囊息肉鉴别诊断 CDF 超声内镜非肿瘤性

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee yong Nam Ahn Seongjoon So Chanwoo park Jong-Seong Bae Taehyun park Il Tae Kim Jaehyun hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （hER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and hER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Artificial layer Dielectric constant Zn metal anode Zinc aqueous battery

乳腺癌新辅助化疗后基于体积的代谢性肿瘤反应与复发风险增高相关

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2015年第3期 283-283页

作者： S.h.hyun h.K.Ahn y.h.park y.h.Im W.h.Kil J.E.Lee 施益洁 Department of Nuclear Medicine Samsung Medical Center Sungkyunkwan University School of Medicine50 Irwon-dongGangnam-gu Seoul 135-710Republic of Korea

目的评估局部晚期乳腺癌病人新辅助化疗后以基于体积的代谢性肿瘤反应预测预后的价值。材料与方法本研究获伦理委员会批准,免除知情同意。选取2006年7

关键词：新辅助化疗乳腺癌乳腺肿瘤代谢性反应

Incremental forming of free surface with magnesium alloy AZ31 sheet at warm temperatures

在线全文

同方期刊数据库

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 2008年第A01期18卷 165-169页

作者： y.h.JI J.J.park Department of Mechanical and System Design Engineering Hongik University

The formabilityof AZ31 sheet begins to increase drastically at 150℃.The incremental forming technique was thus applied to AZ31 sheet at 150℃to utilize the formability to its fullest capacity at the lowest possible temperature for forming applications.A surface scanning technique was used followed by the tool path generation to incrementally form an egg *** thorough examination of various tool paths,the surface was most successfully produced by forming an intermediate shape followed by a series of tool *** scale stickers were devised to improve the accuracy in the measurement of grid deformation.

关键词：金属材料数控成形加工 AZ31镁合金板材