检索结果-南通市图书馆

Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and a high risk of perforation

引用

World Journal of Pediatrics 2018年第2期14卷 184-190页

作者： Hee Mang Yoon Jung Heon Kim Jong Seung Lee jeong-Min ryu Dae Yeon Kim jeong-Yong Lee Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Emergency Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatric Surgery Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatrics Asan Medical CenterUniversity of Ulsan College of Medicine88Olympic-ro 43-gilSongpa-guSeoul 05505South Korea

Background Appendicolith can cause appendiceal obstruction and acute *** high prevalence may be related to the high perforation rate in pediatric *** study assessed the characteristics of appendicolith and its clinical significance in pediatric *** A retrospective study was performed among children and adolescents younger than 17 years who were preopera-tively diagnosed with appendicitis in the pediatric emergency department(ED).A total of 269 patients with a mean age of 9.98±3.37 years were *** features and contrast-enhanced computed tomography findings were *** Among the 269 patients,147(54.6%)had appendicoliths,with a mean maximal diameter of 5.21±2.34 ***-pared to the no appendicolith group,the appendicolith group demonstrated more prolonged abdominal pain(≥48 hours)before the ED visit(23.1%vs.11.5%;P=0.013),clinical features of severe appendicitis(presence of fever,vomiting,posi-tive urine ketone,and increased C-reactive protein),and higher rate of perforation(43.5%vs.9.8%;P<0.001).Multivariate risk factor analysis for perforated appendicitis in the appendicolith group revealed that maximal diameter of 5 mm or more in the appendicolith(adjusted odds ratio[aOR]2.919;95%CI 1.325-6.428,P=0.008)and proximal collapse adjacent to the appendicolith(aOR 2.943;95%CI 1.344-6.443,P=0.007)were *** Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and severe clinical conditions with a high risk of perforation.

关键词： Appendicitis Appendicolith Computed tomography Pediatrics Risk factors

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

Selective recovery of Sn from copper alloy dross and its heat-treatment for synthesis of SnO_2

引用

Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 157-161页

作者： Jung-Il LEE Jong Bum PARK Tae Wan KIM Man-Sik KONG jeong Ho ryu Department of Materials Science and Engineering Korea National University of Transportation Functional Materials Research Team Advanced Materials & Processing Center Institute for Advanced Engineering Yongin Gyunggi 449-863 Korea

Preliminary study on concentration and separation of tin(Sn) from copper alloy dross by selective dissolution method was conducted. The tin in the copper alloy dross did not dissolve in an aqueous nitric acid solution which could allow separation of tin from the copper alloy dross. The tin as H2SnO3(metastannic acid) phase was precipitated in the solution with centrifuging process and transformed to tin dioxide(SnO2) after drying process. The dried sample was heat-treated at low temperature and its phase characteristics, surface morphology and chemical composition were investigated.

关键词： recovery of Sn copper alloy dross selective dissolution SnO2

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

Zn-doped nickel iron(oxy)hydroxide nanocubes passivated by polyanions with high catalytic activity and corrosion resistance for seawater oxidation

引用

Journal of Energy Chemistry 2023年第6期81卷 82-92,I0004页

作者： So Jung Kim Heechae Choi jeong Ho ryu Kang Min Kim Sungwook Mhin Arpan Kumar Nayak Junghwan Bang Minyeong Je Ghulam Ali Kyung Yoon Chung Kyeong-Han Na Won-Youl Choi Sunghwan Yeo Jin Uk Jang HyukSu Han Department of Energy Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea Theoretical Materials&Chemistry Group Institute of Inorganic ChemistryUniversity of CologneGreinst.650939CologneGermany Materials Lab Geobuk-ro 25-50Incheon 22793Republic of Korea Department of Materials Science and Engineering Korea National University of Transportation50 Daehak-roChungjuChungbuk 27469Republic of Korea Korea Institute of Industrial Technology 137-41 Gwahakdanji-roGangneung-siGangwon 25440Republic of Korea Department of Advanced Materials Engineering Kyonggi UniversitySuwon 16227Republic of Korea Korea Institute of Industrial Technology 156 Gaetbeol-roYeonsu-guIncheon 406-840Republic of Korea U.S.-Pakistan Center for Advanced Studies in Energy(USPCASE) National University of Sciences and Technology(NUST)H-12IslamabadPakistan Energy Storage Research Center Korea Institute of Science and TechnologyHwarang-ro 14-gil 5Seongbuk-guSeoul 02792Republic of Korea Division of Energy and Environment Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea Department of Metal and Materials Engineering Gangneung-Wonju National University 7 JukheongilGangneungGangwon 25457Republic of Korea Smart Hydrogen Energy Center Gangneung-Wonju National University7 JukheongilGangneungGangwon 25457Republic of Korea Innovative Fuel Development Division Korea Atomic Energy Research InstituteDaedeok-daero 989-111Yuseong-guDaejeon 305-353Republic of Korea

Electrochemical water splitting to produce hydrogen fuel is a promising renewable energy-conversion ***-scale electrolysis of freshwater may deplete water resources and cause water scarcity ***,seawater electrolysis is a potential solution to the future energy and water *** seawater electrolysis,it is critical to develop cost-effective electrocatalysts to split seawater without chloride ***,we present zinc-doped nickel iron(oxy)hydroxide nanocubes passivated by negatively charged polyanions(NFZ-PBA-S)that exhibits outstanding catalytic activity,stability,and selectivity for seawater *** dopants and polyanion-rich passivated surface layers in NFZ-PBA-S could effectively repel chlorine ions and enhance corrosion resistance,enabling its excellent catalytic activity and stability for seawater oxidation.

关键词： Seawater splitting Oxygen evolution reaction Electrocatalyst Layered double hydroxide Sulfidation

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

Protein Arginine Methyltransferase 1 Ablation in Motor Neurons Causes Mitochondrial Dysfunction Leading to Age-related Motor Neuron Degeneration with Muscle Loss

引用

Research 2024年第1期2023卷 637-649页

作者： Hyun-Kyung So Hyebeen Kim Jinwoo Lee Chang-Lim You Chae-Eun Yun Hyeon-Ju jeong Eun-Ju Jin Yunju Jo Dongryeol ryu Gyu-Un Bae Jong-Sun Kang Department of Molecular Cell Biology Sungkyunkwan University School of MedicineSuwonKorea Single Cell Network Research Center Sungkyunkwan University School of MedicineSuwonKorea Research Institute of Aging-Related Diseases AniMusCureInc.SuwonKorea Drug Information Research Institute Muscle Physiome Research CenterCollege of PharmacySookmyung Women’s UniversitySeoulKorea

Neuromuscular dysfunction is tightly associated with muscle wasting that occurs with age or due to degenerative ***,the molecular mechanisms underlying neuromuscular dysfunction are currently *** studies have proposed important roles of Protein arginine methyltransferase 1(Prmt1)in muscle stem cell function and muscle *** the current study,we set out to determine the role of Prmt1 in neuromuscular function by generating mice with motor neuron-specific ablation of Prmt1(mnKO)using *** exhibited age-related motor neuron degeneration and neuromuscular dysfunction leading to premature muscle loss and ***1 deficiency also impaired motor function recovery and muscle reinnervation after sciatic nerve *** transcriptome analysis of aged mnKO lumbar spinal cords revealed alterations in genes related to inflammation,cell death,oxidative stress,and ***,mnKO lumbar spinal cords of sciatic nerve injury model or aged mice exhibited elevated cellular stress response in motor ***,Prmt1 inhibition in motor neurons elicited mitochondrial *** findings demonstrate that Prmt1 ablation in motor neurons causes agerelated motor neuron degeneration attributing to muscle ***,Prmt1 is a potential target for the prevention or intervention of sarcopenia and neuromuscular dysfunction related to aging.

关键词： degeneration impaired prevention

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 Method of Designing Nonlinear Channel Equalizer Using Conditional Fuzzy C-Means Clustering

A Method of Designing Nonlinear Channel Equalizer Using Cond...

引用

2002年第6届信号处理国际会议

作者： Bum-Jin Oh Keun-Chang Kwak Sung-Soo Kim jeong-Woong ryu School of Electrical Engineering Chungbuk National University Cheongju. Korea School of Electrical Engineering Chungbuk National University Cheongju. Korea School of Electrical Engineering Chungbuk National University Cheongju. Korea School of Electrical Engineering Chungbuk National University Cheongju. Korea

＜正＞ In this paper, we propose a new method of designing a nonlinear channel equalizer using an adaptive neuro-fuzzy clustering method called a conditional fuzzy c-means. The structure identification of an adaptive neuro-fuzzy system is performed by the conditional fuzzy c-means clustering method with the homogeneous properties of the given input and output data. The parameter identification is established by hybrid learning using the back-propagation algorithm and the recursive least square estimation. Experimental results demonstrate that the proposed method improves the performance of neuro-fuzzy system. Finally, we applied the proposed method to designing a nonlinear channel equalizer and obtained better results than previous methods.

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

The Usefulness of Beneficiaries Follow - Up Who Are Applicable the ACR -BIRADS Category 3 Among Health Screenings

The Usefulness of Beneficiaries Follow - Up Who Are Applicab...

引用

2009中华医学会影像技术分会第十七次全国学术大会

作者： Yung-ju Kim jeong ryu Hye-jung koo Hyun-bok Lee Nam-soo Cho Department of Radiology Samsung Medical Center

Objective:The evaluation of the usefulness of Short term follow-ups based on the result analysis of beneficiaries who are applicable by the ACR-BIRADS Category 3(probably benign) among the mammary cancer test result t...

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

White luminescence of Ho^(3+)/Tm^(3+)/Yb^(3+)-codoped CaWO_4 synthesized via citrate complex route assisted by microwave irradiation

引用

Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 134-140页

作者： Hyun CHO Seok Min HWANG Jae Bin LEE Dong Hyun KA Tae Wan KIM Bo Seul LEE Ji Young LEE Jung-Il LEE jeong Ho ryu Department of Nanomechatronics Engineering Pusan National University50 Cheonghak-ri Miryang Gyeongnam 627-706 Korea Department of Materials Science and Engineering Korea National University of Transportation Chungju Chungbuk 380-702 Korea

The nanocrystalline Ho3+/Tm3+/Yb3+ co-doped CaWO4 upconversion(UC) phosphors were successfully synthesized by a modified citrate complex method using microwave irradiation. The citrate complex precursors were heat-treated at temperature ranging from 300 to 700 °C for 3 h. Crystallization of the Ho3+/Tm3+/Yb3+ co-doped CaWO4 was detected at 400 °C, and entirely completed at 600 °C. The Ho3+/Tm3+/Yb3+ co-doped CaWO4 heat-treated at 600 °C showed primarily spherical and homogeneous morphology. Under the laser excitation of 980 nm, Ho3+/Tm3+/Yb3+ co-doped CaWO4 shows the bright white upconversion(UC) emission visible to the naked eye, which is composed of a blue emission at 475 nm from Tm3+, and green and red emissions at 543 and 651 nm respectively from Ho3+. The coordinates of Ho3+/Tm3+/Yb3+ co-doped CaWO4 in the Commission International De'eclairage(CIE) chromaticity diagram could be controlled from a cool to a warm white color depending on the Tm3+ and Ho3+ concentrations. The UC luminescent properties on Tm3+ and Ho3+ concentrations and related mechanism based on laser pump power were discussed in detail.

关键词： upconversion CaWO4 microwave irradiation white luminescence

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

Light-Material Interactions Using Laser and Flash Sources for Energy Conversion and Storage Applications

引用

Nano-Micro Letters 2024年第12期16卷 468-514页

作者： Jung Hwan Park Srinivas Pattipaka Geon-Tae Hwang Minok Park Yu Mi Woo Young Bin Kim Han Eol Lee Chang Kyu jeong Tiandong Zhang Yuho Min Kwi-Il Park Keon Jae Lee Jungho ryu Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61Daehak-RoGumiGyeongbuk 39177Republic of Korea Department of Materials Science and Engineering Pukyong National University45Yongso-RoNam-GuBusan 48513Republic of Korea Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Division of Advanced Materials Engineering Jeonbuk National UniversityJeonju 54896JeonbukRepublic of Korea School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080People’s Republic of China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080People’s Republic of China Department of Materials Science and Metallurgical Engineering Kyungpook National University80 Daehak-RoBuk-GuDaegu 41566Republic of Korea School of Materials Science and Engineering Yeungnam UniversityDaehak-RoGyeongsan-Si 38541Gyeongsangbuk-doRepublic of Korea

This review provides a comprehensive overview of the progress in light-material interactions(LMIs),focusing on lasers and flash lights for energy conversion and storage *** discuss intricate LMI parameters such as light sources,interaction time,and fluence to elucidate their importance in material *** addition,this study covers various light-induced photothermal and photochemical processes ranging from melting,crystallization,and ablation to doping and synthesis,which are essential for developing energy materials and ***,we present extensive energy conversion and storage applications demonstrated by LMI technologies,including energy harvesters,sensors,capacitors,and *** the several challenges associated with LMIs,such as complex mechanisms,and high-degrees of freedom,we believe that substantial contributions and potential for the commercialization of future energy systems can be achieved by advancing optical technologies through comprehensive academic research and multidisciplinary collaborations.

关键词： Light Light-material interaction Nanomaterials Energy conversion and storage devices

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 TiC on the microstructure refinement and mechanical property enhancement of additive manufactured Inconel 625/TiC metal matrix composites fabricated with novel core-shell composite powder

引用

Journal of Materials Science & Technology 2023年第33期164卷 13-26页

作者： Taegyu Lee Wonjong jeong SeungHyeok Chung Ho Jin ryu Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and TechnologyYu Seong-GuDae Hak-Ro 29134141 DaejeonRepublic of Korea

The flexible product shape of additive manufacturing(AM)is attractive,but the process suffers from a lack of material property diversity due to a limited number of printable alloys and post-processing *** overcome this problem,the AM of metal matrix composites(MMCs)is a highly suitable solution because the properties of MMC can be tailored using various ***,extensive research has been conducted on the AM of MMCs;however,the major huddle for this process has been the difficulties in preparing feedstock powder and operating the AM *** study introduces an easily synthesizable core-shell composite powder,which was fabricated by a recently developed process called the SMART *** core-shell powder has a novel morphology,consisting of a metal core and composite shell,distinguishing it from the powders used in conventional AM *** 625/TiCp composites were fabricated using the core-shell composite powder,with various fractions of TiCp up to 10 vol.%.Compared to additive-manufactured Inconel 625,the additive-manufactured MMCs showed enhanced strength with significantly fewer *** results of this study may accelerate the application of MMC fabricated by AM,which offers superior properties and reliability compared to casting and powder metallurgy due to the higher degree of dislocation density and reinforcement dispersion.

关键词： Powder treatment Composite powder Metal matrix composite Additive manufacturing Nickel-based superalloy Directed energy deposition

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

Biologically inspired ultrathin arrayed camera for high-contrast and high-resolution imaging

引用

Light(Science & Applications) 2020年第1期9卷 1742-1748页

作者： Kisoo Kim Kyung-Won Jang Jae-Kwan ryu Ki-Hun jeong Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea KAIST Institute for Health Science and Technology KAISTDaejeon 34141Republic of Korea Unmanned/Robotic Systems Lab. LIG Nex1 Co.LtdSeongnam 13488Republic of Korea

Compound eyes found in insects provide intriguing sources of biological inspiration for miniaturised imaging ***,we report an ultrathin arrayed camera inspired by insect eye structures for high-contrast and super-resolution *** ultrathin camera features micro-optical elements(MOEs),i.e.,inverted microlenses,multilayered pinhole arrays,and gap spacers on an image *** MOE was fabricated by using repeated photolithography and thermal *** fully packaged camera shows a total track length of 740μm and a field-of-view(FOV)of 73°.The experimental results demonstrate that the multilayered pinhole of the MOE allows high-contrast imaging by eliminating the optical crosstalk between *** integral image reconstructed from array images clearly increases the modulation transfer function(MTF)by~1.57 times compared to that of a single channel image in the ultrathin *** ultrathin arrayed camera provides a novel and practical direction for diverse mobile,surveillance or medical applications.

关键词： resolution high camera

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：