检索结果-南通市图书馆

Comparative study of extrudability, microstructure, and mechanical properties of AZ80 and BA53 alloys

Journal of Magnesium and Alloys 2023年第1期11卷 249-258页

作者： Sang-Cheol Jin Jae Won cha Jongbin Go Jun Ho Bae Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering Kyoto UniversityKyoto 606-8501Japan Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

The extrudability,microstructural characteristics,and tensile properties of the Mg–5Bi–3Al(BA53)alloy are investigated herein by comparing them with those of a commercial Mg–8Al–0.5 Zn(AZ80)*** AZ80 is extruded at 400℃,severe hot cracking occurs at exit speeds of 4.5 m/min or *** contrast,BA53 is successfully extruded without any surface cracking at 400℃ and at high exit speeds of 21–40 m/*** extruded at 3 m/min(AZ80–3)and 40 m/min(BA53–40),both AZ80 and BA53 exhibited completely recrystallized microstructures with abasal ***,BA53–40 has a coarser grain structure owing to grain growth promoted by the high temperature in the deformation ***80–3 contains a continuous network of Mg_(17)Al_(12) particles along the grain boundaries,which form via static precipitation during natural air-cooling after the material exits the extrusion ***53–40 contains coarse Mg_(3)Bi_(2) particles aligned parallel to the extrusion direction along with numerous uniformly distributed fine Mg_(3)Bi_(2) ***80–3 has higher tensile strength than BA53–40 because the relatively finer grains and larger number of solute atoms in AZ80–3 result in stronger grain-boundary and solid-solution hardening effects,*** BA53 is extruded at a high temperature and extrusion speed of 400℃ and 40 m/min,respectively,the extruded material has a high tensile yield strength of 188 *** can be primarily attributed to the large particle hardening effect resulting from the numerous fine Mg_(3)Bi_(2) particles.

关键词： Mg-Bi-Al alloy Extrusion Hot cracking Second phase Tensile properties

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

A facile one-step approach to hierarchically assembled core-shell-like MnO2@MnO2 nanoarchitectures on carbon fibers： An efficient and flexible electrode material to enhance energy storage

引用

Nano Research 2016年第5期9卷 1507-1522页

作者： Goli Nagaraju Yeong Hwan Ko Sung Min cha Sang Hyuk Im Jae Su Yu Department of Electronics and Radio Engineering Institute for Wearable Convergence Electronics Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701 Republic of Korea Functional Crystallization Center (ERC) Department of Chemical Engineering Kyung Hee University 1732 Deogyeong-daeroGiheuncl-qu Yonqin-si Gyeonqqi-do 446-701 Republic of Korea

Hierarchical core-shell-like MnO2 nanostructures （NSs） were used to anchor MnO2 hexagonal nanoplate arrays （HNPAs） on carbon cloth （CC） fibers. The NSs were prepared by a novel one-step electrochemical deposition method. Under an external cathodic voltage of -2.0 V for 30 min, hierarchical core-shell-like MnO2-NS-decorated MnO2 HNPAs （MnO2 NSs@MnO2 HNPAs） were uniformly grown on CC with reliable adhesion. The phase purity and morphological properties of the samples were characterized by various physicochemical techniques. At a constant external cathodic voltage, growth of MnO2 NSs@MnO2 HNPAs on CC was carried for different time periods. When utilized as a flexible, robust, and binder-free electrode for pseudocapacitors, the hierarchical core-shell-like MnO2 NSs@MnO2 HNPAs on CC showed clearly enhanced electrochemical properties in 1 M Na2SO4 electrolyte solution. The results indicate that the MnO2 NSs@MnO2 HNPAs on CC have a maximum specific capacitance of 244.54 F/g at a current density of 0.5 A/g with excellent cycling stability compared to that of bare MnO2 HNPAs on CC （112.1 F/g at 0.5 A/g current density）. We believe that the superior charge storage performance of the pseudocapacitive electrode can be mainly attributed to the hierarchical MnO2 NSs@MnO2 HNPAs building blocks that have a large specific surface area, offering additional electroactive sites for efficient electrochemical reactions. The facile and single-step approach to growth of hierarchical pseudocapacitive materials on textile based electrodes opens up the possibility for the fabrication of high-performance flexible energy storage devices.

关键词： manganese oxide hierarchical structures carbon cloth electrochemical deposition energy storage properties

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

Predicting the Rainfall-Triggered Landslides in a Forested Mountain Region Using TRIGRS Model

引用

Journal of Mountain Science 2010年第1期7卷 83-91页

作者： Dongyeob KIM Sangjun IM Sang Ho LEE Youngjoo HONG Kyung-Sub cha Dept. of Forest Sciences Seoul National University Dept. of Forest Sciences Research Institute for Agriculture & life sciences Seoul National University Civil Engineering Team DaeWoo E&C Suwon 440-210 Korea

Landslides are natural disasters which can pose a serious threat to human and property in many areas around the world. The Transient Rainfall Infiltration and Grid-based Regional Slope-stability (TRIGRS) model was used to investigate the rainfall-induced shallow landslides in a forested mountain region, Korea. Various input data for TRIGRS model include time-varying rainfall, topographic characteristics, soil depth, material strength, and hydraulic properties. A series of calculations were conducted in determining the slope stability over the Jangheung region in Korea during the storm occurred on August 6, 1998. The results show that TRIGRS model captured about 64.1% of landslides that were extracted from the IKONOS2 imageries. The model demonstrated how the factor of safety changed with time during a storm considering both the transient and spatial responses of pore water pressure in its slope stability calculation.

关键词： TRIGRS landslides IKONOS2 safetyfactor slope stability Korea

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

Chitosan and β-cyclodextrin Microspheres as Pulmonary Sustained Delivery Systems

引用

Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 541-546页

作者： ZHANG weifen CHEN Xiguang LI Piwu HE Qiangzhi ZHOU Huiyun cha Dongsu College of Marine Life Science Ocean University of China Qingdao 266003 China Shandong Academy of Food and Fermentation Industries Jinan 250013 China Graduate School of Biotechnology Korea University Seoul 136-701 Korea Depantment of Pharmacy Weifang Medical University Weifang 261042 China

Chitosan and β-cyclodextrin were used to prepare microspheres with theophylline for pulmonary delivery by spray drying method. The characteristics, mucociliotoxicity, permeation rate and drug release were studied. The drug entrapments of microspheres Ⅰ, Ⅱ and Ⅲ were from 35.70% to 21.09% and 13.33%, while yields and encapsulation efficiencies were higher than 45% and about 90% respectively. The microspheres possessed low tap densities （0.34-0.48 g/cm^3）, appropriate diameters （3.35-3.94 μm） and theoretical aerodynamics diameters （2.20-3.04 μm）. SEM images showed the microspheres were spherical with smooth or wrinkled surface surfaces. FT-IR demonstrated theophylline had formed hydrogen bonds with chitosan and fl-cyclodextrin. The microspheres could effectively reduce the ciliotoxicity and easy to penetrate the memberine. The in vitro release of the microspheres was related to the ratio of drug/polymer and microspheres Ⅱ had a prolong release, providing the release of 72.00% in 12 h. The results suggestes that chitosan/β-cyclodextrin microspheres Ⅱ are a promising carrier as sustained release for pulmonary delivery.

关键词： theophylline chitosan spray-drying microspheres pulmonary delivery

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

Application of malignant pleural effusion cell blocks in the diagnosis and personalized treatment of advanced non-small cell lung carcinoma

引用

Oncology and Translational Medicine 2019年第3期5卷 109-113页

作者： wei Luan Nier cha Yinzai He Baoqing Jia Departments of Oncology Inner Mongolia People's HospitalHohhot 010017China Departments of Surgical Oncology Inner Mongolia People's HospitalHohhot 010017China

Objective The aim of the study was to investigate the efficacy of immunocytochemistry and related gene detection using cell block for the diagnosis and individualized treatment of advanced lung *** Sixty-five malignant pleural effusion specimens were collected to make cell blocks, which were used for hematoxylin and eosin(H&E) staining, immunocytochemical studies, and gene sequencing of the tumors to guide the individualized diagnoses and treatment of the given tumors. Results The tumor cells in the cell block sections were abundant in number with high quality cellular structures, and the histological morphological characteristics were partially maintained. Immunocytochemical staining was helpful in identifying the cell origin and tumor classification, and amplification refractory mutation system(ARMS) was used to determine the mutation status of epidermal growth factor receptor(EGFR). Of the 65 samples, 50 had a diagnosis of adenocarcinoma, 7 were pulmonary squamous cells, 6 were small cell carcinoma of the lung, and 2 were mesothelioma. The morphological features of the tumors were as follows: acinar formation, papillary and single cells for adenocarcinoma;intercellular bridges for squamous cell carcinoma;and morphology of the small cells is similar to that of the smear. Correlating with the results of immunocytochemical staining and clinical data analysis, 40 cases were confirmed as pulmonary adenocarcinoma, with an additional 4 cases of breast cancer, 3 cases of ovarian adenocarcinoma, and 3 cases of colorectal adenocarcinoma. Of the 47 non-small cell lung carcinoma(NSCLC) patients, EGFR mutations were detected in 26 cases(55.3%) by ARMS, with four mutation types: exon 19 deletion(13 cases, 50.0%), exon 2l point mutations L858R(11 cases, 42.3%) and L861Q(1 case, 3.8%), and exon 18 point mutation G719X(1 case, 3.8%). Conclusion Malignant pleural effusion cell blocks combined with immunocytochemical markers and molecular pathology are helpful for the di

关键词： pleural effusion cell block immunocytochemistry epidermal growth factor receptor(EGFR)

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

Effects of Initial and Boundary Conditions on Heavy Rainfall Simulation over the Yellow Sea and the Korean Peninsula:Comparison of ECMWF and NCEP Analysis Data Effects and Verification with Dropsonde Observation

引用

Advances in Atmospheric Sciences 2024年第9期41卷 1787-1803页

作者： Jiwon HWANG Dong-Hyun cha Donghyuck YOON Tae-Young GOO Sueng-Pil JUNG Department of Civil Urban Earth and Environmental Engineering Ulsan National Institute of Science and TechnologyUlsan 44919South Korea Program in Atmospheric and Oceanic Sciences Princeton UniversityPrincetonNew Jersey 08544USA National Institute of Meteorological Sciences NIMSJeju 63568South Korea

This study evaluated the simulation performance of mesoscale convective system(MCS)-induced precipitation,focusing on three selected cases that originated from the Yellow Sea and propagated toward the Korean *** evaluation was conducted for the European Centre for Medium-Range Weather Forecasts(ECMWF)and National Centers for Environmental Prediction(NCEP)analysis data,as well as the simulation result using them as initial and lateral boundary conditions for the Weather Research and Forecasting ***,temperature and humidity profiles from 3D dropsonde observations from the National Center for Meteorological Science of the Korea Meteorological Administration served as validation *** showed that the ECMWF analysis consistently had smaller errors compared to the NCEP analysis,which exhibited a cold and dry bias in the lower levels below 850 *** model,in terms of the precipitation simulations,particularly for high-intensity precipitation over the Yellow Sea,demonstrated higher accuracy when applying ECMWF analysis data as the initial *** advantage also positively influenced the simulation of rainfall events on the Korean Peninsula by reasonably inducing convective-favorable thermodynamic features(i.e.,warm and humid lower-level atmosphere)over the Yellow *** conclusion,this study provides specific information about two global analysis datasets and their impacts on MCS-induced heavy rainfall simulation by employing dropsonde observation ***,it suggests the need to enhance the initial field for MCS-induced heavy rainfall simulation and the applicability of assimilating dropsonde data for this purpose in the future.

关键词： initial conditions dropsonde heavy rainfall forecast global model analysis evaluation

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

Size-dependent transition of the deformation behavior of Au nanowires

引用

Nano Research 2015年第3期8卷 941-947页

作者： Na-Young Park Ho-Seok Nam PiI-Ryung cha Seung-Cheol Lee School of Advanced Materials Engineering Kookmin University Seou1136-702 R. O. Korea Future Convergence Research Division Korea Institute of Science and Technology (KIST) Seou1136-791 R. O. Korea Indo-Korea Science and Technology Center Korea Institute of Science and Technology (KIST) Seou1136-791 R. O. Korea

Inspired by the controversy over tensile deformation modes of single-crystalline 〈110〉/{111} Au nanowires, we investigated the dependency of the deformation mode on diameters of nanowires using the molecular dynamics technique. A new criterion for assessing the preferred deformation mode-slip or twin propagation--of nanowires as a function of nanowire diameter is presented. The results demonstrate the size-dependent transition, from superplastic deformation mediated by twin propagation to the rupture by localized slips in deformed region as the nanowire diameter decreases. Moreover, the criterion was successfully applied to explain the superplastic deformation of Cu nanowires.

关键词： Au nanowire molecular dynamics size-dependent transition tensile deformationmechanism

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

A robust optical/inertial data fusion system for motion tracking of the robot manipulator

引用

Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第7期15卷 574-583页

作者： Jie CHEN Can-jun YANG Jens HOFSCHULTE Wan-li JIANG cha ZHANG State Key Laboratory of Fluid Power Transmission and Control Zhejiang University ABB Corporate Research China

We present an optical/inertial data fusion system for motion tracking of the robot manipulator, which is proved to be more robust and accurate than a normal optical tracking system(OTS). By data fusion with an inertial measurement unit(IMU), both robustness and accuracy of OTS are improved. The Kalman filter is used in data fusion. The error distribution of OTS pro-vides an important reference on the estimation of measurement noise using the Kalman filter. With a proper setup of the system and an effective method of coordinate frame synchronization, the results of experiments show a significant improvement in terms of robustness and position accuracy.

关键词： Data fusion Optical tracking Inertial measurement unit Kalman filter

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

图书馆与旅游融合发展实践及思考

引用

图书馆 2020年第2期 41-45页

作者：查炜山东社会科学院省情与社会发展研究院

在长期的建设和发展过程中,图书馆对其与旅游融合进行了比较深入的思考研究。文章系统梳理了相关研究成果,考察了图书馆与"行、游、住、食、购、娱"旅游六要素不同程度的融合发展实践,分析了图书馆在文旅融合环境下面临的挑战。图书馆... 详细信息

在长期的建设和发展过程中,图书馆对其与旅游融合进行了比较深入的思考研究。文章系统梳理了相关研究成果,考察了图书馆与"行、游、住、食、购、娱"旅游六要素不同程度的融合发展实践,分析了图书馆在文旅融合环境下面临的挑战。图书馆要保持服务初心,明确自身社会职能,坚守文化担当,通过完善文旅融合保障机制、探索文旅融合发展有效路径、提高从业人员文化素质和文化修养等措施,实现图书馆文旅融合的创新发展。

关键词：图书馆文旅融合旅游服务融合实践

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

Improvement in Sensitivity and Recovery of Single-Walled Carbon Nanotube-Based Gas Sensors

引用

稀有金属材料与工程 2006年第A03期35卷 188-189页

作者： Hong-Quang Nguyen Geon-Young cha Joon-Boo Yu Jeung-Soo Huh Department of Materials Science and Metallurgy Kyungpook National UniversitySangyuk-DongBukgu 1370Daegu 702-701Korea

In this paper,an improvement in sensitivity and recovery of the single-walled carbon nanotube (SWNT)-based gas sensors was *** sensors were fabricated from SWNT powder by a screen-printing method,followed by annealing for 2 h in open-air at various *** Raman spectra of the SWNT bundles and the response to ammonia (NH_3) exposure of the sensors indicated that the annealing at a relevant temperature improved the sensor *** sensor annealed at 200℃exhibited a high sensitivity in NH_3 *** 20 min of exposure to NH_3 at room temperature,the resistance of the sensor increased up to 12% in comparison with its initial *** evacuating combined with maintaining the flux of carrier gas at 300 sccm,the sensor recovery was significantly *** sensor resistance retrieved to its initial value after only 25 min degassing. These results would be considered in the development of the SWNT-based gas sensors.

关键词： carbon nanotubes gas adsorption recovery sensitivity sensor

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：