检索结果-南通市图书馆

Dynamic deformation behavior and microstructural evolution during high-speed rolling of Mg alloy having non-basal texture

引用

Journal of Materials Science & Technology 2019年第4期35卷 473-482页

作者： Sang-hoon Kim Jeong Hun lee Chong Soo lee Jonghun Yoon Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Ulsan Regional Division Korea Institute of Industrial Technology Graduate Institute of Ferrous Technology Pohang University of Science and Technology Department of Mechanical Engineering Hanyang University

The dynamic deformation behaviors and resultant microstructural variations during high-speed rolling(HSR) of a Mg alloy with a non-basal texture are investigated. To this end, AZ31 alloy samples in which the basal poles of most grains are predominantly aligned parallel to the transverse direction(TD) are subjected to hot rolling with different reductions at a rolling speed of 470 m/min. The initial grains with a TD texture are favorable for {10–12} twinning under compression along the normal direction(ND); as a result, {10–12} twins are extensively formed in the material during HSR, and this consequently results in a drastic evolution of texture from the TD texture to the ND texture and a reduction in the grain size. After the initial grains are completely twinned by the {10–12} twinning mechanism, {10–11} contraction twins and {10–11}-{10–12} double twins are formed in the {10–12} twinned grains by further *** the contraction twins and double twins have crystallographic orientations that are favorable for basal slip during HSR, dislocations easily accumulate in these twins and fine recrystallized grains nucleate in the twins to reduce the increased internal strain energy. Until a rolling reduction of 20%, {10–12}twinning is the main mechanism governing the microstructural change during HSR, and subsequently,the microstructural evolution is dominated by the formation of contraction twins and double twins and the dynamic recrystallization in these twins. With an increase in the rolling reduction, the average grain size and internal strain energy of the high-speed-rolled(HSRed) samples decrease and the basal texture evolves from the TD texture to the ND texture more effectively. As a result, the 80% HSRed sample, which is subjected to a large strain at a high strain rate in a single rolling pass, exhibits a fully recrystallized microstructure consisting of equiaxed fine grains and has an ND basal texture without a TD texture component.

关键词： Magnesium alloy High-speed rolling Texture Dynamic recrystallization Twinning

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

Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

引用

Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim Joo Song lee Kyu seung lee Ji-Yeon Kim Kang Bok Ko Sang-Youp Yim Seongjun Kim hoon-Kyu Shin Donghee Park Yong Ju Yun Dong Ick Son Institute of Advanced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of Semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm wavelength range and a positive photoresponse appeared at 700 nm *** resulted in the high negative responsivity of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent ***,we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum *** study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

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

Expertise Marginalized： Quality Inspection and the Grain Market in Republican China

引用

Frontiers of History in China 2015年第4期10卷 668-694页

作者： seung-joon lee Department of History National University of Singapore Singapore 117570 Singapore

With the help of professionally trained agricultural scientists, the Guomindang＇s Nationalist government drafted a large-scale program for agricultural reconstruction in the late 1920s and early 1930s. At the heart of the program was a scientific rice-breeding experiment with the potential to produce great numbers of new high-yield rice varieties. However, this scientific achievement could not assure success of the new rice varieties in the market because the marketability of rice was determined not by the scientific productivity improvement but by a series of processes required before the rice reached consumers. For this, local and practical contexts had to be considered. By juxtaposing two different forms of ＂rice expertise,＂ this paper illuminates the incompatibility between the state＇s productivist understanding of agricultural improvement and the quality issue in the grain market.

关键词： rice trade the rural revival program agricultural science plant breeding

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

Milk protein-shelled gold nanoparticles with gastrointestinally active absorption for aurotherapy to brain tumor

引用

Bioactive Materials 2022年第2期7卷 35-48页

作者： Hyung Shik Kim seung Jae lee Dong Yun lee Department of Bioengineering College of Engineeringand BK FOUR Biopharmaceutical Innovation Leader for Education and Research GroupHanyang UniversitySeoul04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul04763Republic of Korea

Orally absorbable gold nanoparticles(AuNP)having cancer ablation therapy is strongly demanded to treat glioblastoma multiforme(GBM)for patients with its highest incidence ***,we develop a milk protein lactoferrin-conjugated AuNP for its oral absorption and targeting to the GBM through the interaction between lactoferrin(Lf)and lactoferrin receptor(LfR)that is highly expressed in the intestine,blood-brain barrier and *** stability and long circulation of AuNP,glutathione and polyethylene glycol(PEG)is introduced,which is called to *** Lf-PEG-AuNP are orally administered to orthotopic GBM-bearing mice,11-fold and 8-fold higher concentrations of AuNP are measured in bloodstreams and GBM in the brain,respectively,compared with ***,orally administered Lf-PEG-AuNP exhibit an outstanding temperature rise in GBM by irradiating laser and significantly reduce tumor ***,we suggest that the Lf-PEG-AuNP can fundamentally target GBM in the brain through oral absorption,and that its efficient photothermal therapy is possible.

关键词： intestine absorption gastrointestinal

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

Mechanical and electrical properties of In-Bi solder at Bi_(2212) superconductor interface with annealed Ag spray layers and Ag precoating layers

引用

中国有色金属学会会刊：英文版 2009年第4期19卷 961-964页

作者： seung-Yong SHIN Ji-Hyun lee Hai-Woong PARK Department of Materials Engineering Korea University of Technology and Education(KUT)

The electrical properties of solder contact layers between Cu-Ni shunt metal and tube type Bi2212 superconductor that is applied in superconducting fault current limiter were *** contact properties of the solders are improved not only by Ag precoating layers,but also by the pre-sprayed Ag layer and subsequent Ag precoating *** annealed Ag sprayed layers onto Bi2212 superconductor prior to Ag electroplating work as protecting layers for the superconductor from plating *** contact angle of the electroplated Ag layer is 42.91° and decreases to 15.25° and 5.88° with Ag sprayed layer and additional Ag electroplated *** Ag sprayed layer with suitable annealing prior to Ag electroplating improves contact strength of the Ag electroplated layer by about 12% due to denser microstructure of the Ag electroplated layers.

关键词：超导故障限流器 Bi2212 电镀银电气性能喷涂层预涂层退火焊料

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

Effect of grain refinement on phase transformation behavior and mechanical properties of Cu-based alloy

引用

中国有色金属学会会刊：英文版 2009年第4期19卷 979-983页

作者： Gwon-seung YANG Jong-Kook lee Woo-Yang JANG Department of Advanced Materials Engineering Chosun University Department of Metallurgical Engineering Chosun University

A small amount of misch metal was added to Cu-Zn-Al alloy in order to study its effect on grain refinement,mechanical properties,phase transformation behavior and stabilization of *** is found that the addition of misch metal is very effective for reducing the grain *** coarse grains over 1 000 μm are refined to the size of 30 μm by the addition of 0.43%(mass fraction) misch *** grain size of thermo-mechanically treated alloys is barely affected by cold *** fracture strength and ductility increase significantly with the increase of misch metal content when tensile test is carried out below Mf ***,the fracture strength is larger in the case of post-quench ageing treatment than that in the case of direct quench ageing *** fracture mode is changed from transgranular brittle fracture to ductile fracture with void formation and coalescence by the addition of misch metal.

关键词：铜基合金力学性能相变行为晶粒细化金属拉伸试验晶粒尺寸断裂强度时效处理

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

Autonomous Optimal Coordination Scheme in Protection System of Power Distribution Network by Using Multi-Agent Concept

引用

Transactions of Tianjin University 2008年第2期14卷 106-111页

作者： lee seung-Jae KIM Tae-Wan lee Gi-Young Next-Generation Power System Technology Center Myongji UniversityYongin449-728KyunggidoKorea

A protection system using a multi-agent concept for power distribution networks is *** digital over current relay(OCR)is developed as an agent by adding its own intelligence,self-tuning and communication *** main advantage of the multi-agent concept is that a group of agents work together to achieve a global goal which is beyond the ability of each individual *** order to cope with frequent changes in the network operation condition and faults,an OCR agent,proposed in this paper,is able to detect a fault or a change in the network and find its optimal parameters for protection in an autonomous manner considering information of the whole network obtained by communication between other *** this kind of coordination and information exchanges,not only a local but also a global protective scheme is *** in a simple distribution network show the effectiveness of the proposed protection system.

关键词： multi-agent system over current relay(OCR) communication protection of distribution network

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

Role of multidetector computed tomography in patients with acute infectious colitis

引用

World Journal of Clinical Cases 2022年第12期10卷 3686-3697页

作者： seung Jung Yu Jae Hyuk Heo Eun Jeong Choi Jong Hyuk Kim Hong Sub lee Sun Young Kim Jae hoon Lim Department of Internal Medicine Inje University Busan Paik HospitalBusan 47392South Korea Department of Radiology Myongji HospitalHanyang University College of MedicineGoyang 10475South Korea Department of Cancer Control and Population Health National Cancer CenterGoyang 10408South Korea

BACKGROUND The role of multidetector computed tomography(MDCT)in patients with acute infectious colitis is still *** To examine the usefulness of MDCT in distinguishing the etiology of acute infectious *** Overall,244 patients who met the criteria for acute infectious colitis and visited the Hospital from February 2015 to 2018 were retrospectively enrolled and divided into two groups(bacterial:204,viral:40)according to causes of acute colitis,based on stool *** MDCT parameters,including wall thickening,submucosal edema,mucosal enhancement,serosa involvement,empty colon sign,small bowel involvement,comb sign,continuous distribution,accordion sign,mucosal thickening,and lymph node enlargement,were constructed in a blinded *** MDCT parameters of wall thickening(OR:13.60;95%CI:5.80–31.88;P<0.001),submucosal edema(OR:36.08;95%CI:13.54–96.13;P<0.001),mucosal enhancement(OR:22.55;95%CI:9.28–54.81;P<0.001),serosal involvement(OR:14.50;95%CI:3.33–63.23;P<0.001),empty colon sign(OR:6.68;95%CI: 2.44–18.32;P < 0.001), continuous distribution (OR: 24.09;95%CI: 9.38–61.90;P < 0.001), accordionsign (OR: 9.02;95%CI: 1.12–72.35;P = 0.038), mucosal thickening (OR: 46.41;95%CI: 10.38–207.51;P< 0.001), and lymph node enlargement (OR: 4.39;95%CI: 1.22–15.72;P = 0.023) were significantlyassociated with bacterial colitis. At least one positive finding in four CT outcomes (submucosaledema, mucosal enhancement, continuous distribution, mucosal thickening) in summer showed ahigh probability of bacterial colitis (sensitivity, 41.67;specificity, 92.50;OR: 24.95).CONCLUSIONMDCT provides many clues that can be useful in suggesting a specific etiology of acute infectiouscolitis.

关键词： Colitis Multidetector computed tomography Differential diagnosis Bacterial infections Viral infections

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

Assessment of incidental focal colorectal uptake by analysis of fluorine-18 fluorodeoxyglucose positron emission tomography parameters

引用

World Journal of Clinical Cases 2022年第17期10卷 5634-5645页

作者： Haejun lee Kyung-hoon Hwang Kwang An Kwon Department of Nuclear Medicine Gachon University College of MedicineGil Medical CenterIncheon 21565South Korea Department of Gastroenterology Gachon University College of MedicineGil Medical CenterIncheon 21565South Korea

BACKGROUND Colon and rectal cancers are among the top five cancers worldwide in terms of their incidence and mortality *** the treatment options for cure include surgery even in specific advanced-stage cases,the early detection of lesions is important for applying active treatment ***-18 fluorodeoxyglucose(F-18 FDG)positron emission tomography/computed tomography(PET/CT)is an established imaging study for many types of cancers;however,physiologic uptake in the gastrointestinal tract is a frequent finding and may interfere with lesion ***,as unexpectedly observed focal colorectal F-18 FDG uptake may harbor malignant lesions,further examination must not be *** To assess the clinical implications of unexpected focal colorectal F-18 FDG uptake by analyzing FDG PET *** A total of 15143 F-18 FDG PET/CT scans performed at our hospital between January 2016 and September 2021 were retrospectively reviewed to identify incidentally observed focal colorectal FDG ***,83 regions showing focal colorectal FDG uptake with final histopathological reports from 80 patients(45 men and 35 women with mean ages of 66.9±10.7 years and 63.7±15.3 years,respectively)were eligible for inclusion in the present *** focal hypermetabolic colorectal region was classified as malignant,premalignant,or benign according to the histopathological *** parameters such as maximum and peak standardized uptake value(SUVmax and SUVpeak),metabolic tumor volume(MTV),mean SUV of the metabolic tumor volume(mSUVmtv),and total lesion glycolysis(TLG)were measured or calculated for the corresponding hypermetabolic *** and nonparametric statistical comparisons of these parameters were performed among the three *** operating characteristic curves were plotted to identify cut-off *** The detection rate of incidental focal colorectal uptake was 0.53%(80/15,143).Of the 83 regions with unexpected fo

关键词： Colorectal Incidental Fluorine-18 fluorodeoxyglucose Positron emission tomography/computed tomography Standardized uptake value

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

Quantitative assessment of the relevance of organic-aniontransporting-polypeptide 1B1 and 2B1 polymorphisms in fexofenadine pharmacokinetic variants via pharmacometrics

引用

Journal of Pharmaceutical Analysis 2023年第6期13卷 660-672页

作者： Ji-Hun Jang seung-Hyun Jeong Yong-Bok lee Department of Pharmacy College of PharmacyChonnam National UniversityGwangju61186Republic of Korea Department of Pharmacy College of PharmacySunchon National UniversitySuncheon-si57922Republic of Korea

Fexofenadine is useful in various allergic disease ***,the pharmacokinetic variability information and quantitative factor identification of fexofenadine are very *** study aimed to verify the validity of previously proposed genetic factors through fexofenadine population pharmacokinetic modeling and to explore the quantitative correlations affecting the pharmacokinetic *** of the organic-anion-transporting-polypeptide(OATP)1B1 and 2B1 have been proposed to be closely related to fexofenadine pharmacokinetic ***,modeling was performed using fexofenadine oral exposure data according to the OATP1B1-and ***1B1 and 2B1 were identified as effective covariates of clearance(CL/F)and distribution volume(V/F)-CL/F,respectively,in fexofenadine pharmacokinetic ***/F and average steady-state plasma concentration of fexofenadine differed by up to 2.17-and 2.20-folds,respectively,depending on the OATP1B1 *** the individuals with different OATP2B1 polymorphisms,the CL/F and V/F differed by up to 1.73-and 2.00-folds,*** of the areas under the curves following single-and multiple-administrations,and the cumulative ratio were significantly different between OATP1B1-and 2B1-polymorphism *** on quantitative prediction comparison through a model-based approach,OATP1B1 was confirmed to be relatively more important than 2B1 regarding the degree of effect on fexofenadine pharmacokinetic *** on the established pharmacokineticpharmacodynamic relationship,the difference in fexofenadine efficacy according to genetic polymorphisms of OATP1B1 and 2B1 was 1.25-and 0.87-times,respectively,and genetic consideration of OATP1B1 was expected to be important in the pharmacodynamics area as *** population pharmacometrics study will be a very useful starting point for fexofenadine precision medicine.

关键词： OATP1B1 OATP2B1 Fexofenadine Population pharmacometrics Genetic polymorphism

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

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：