检索结果-南通市图书馆

The experimental study for the allocation of ground-sills downstream of check dams

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2008年第1期23卷 28-43页

作者： Bing-Shyan LIN Chao-Hsien yeh Hui-Pang LIEN Candidate Department of Civil and Hydraulic Engineering Institute and Construction and Disaster Prevention Research Center Feng-Chia University Department of Water Resources Engineering Feng-Chia University

The main purpose of this study is to understand the stabilizing effect of ground-sills on the riverbed through a series of flume model experiments. From results, although check dams have the ability to control upstream sediment transport, the mass energy produced by the free fall of the overtopping discharge still causes strong local scour downstream of the structure, and this scour leads to the instability of the check dam. Therefore, this study conducted model experiments on various types of serial ground-sills to determine the appropriate spacing to best protect the downstream bed. Based on the observations and analysis of channel geomorphology and sedimentation, this study concluded the following results: 1) Serial ground-sills reduces the sediment transport ability perfectly, especially under a mild channel gradient equipped with 2-4 times the average channel width interval. But for steep slopes, it is suggested that the proper spacing should be shortened to 1-2 times the average channel width. 2) Ground-sills can effectively protect the streambed from scouring under a suitable equipped condition and the concepts of guiding scour and riverbed inertia were used in the analysis of optimal ground-sill spacing.

关键词： Serial ground-sills Sedimentation Strong scour area Riverbed inertia Guiding scour

Association of overtime work and obesity with needle stick and sharp injuries in medical practice

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第35期9卷 10937-10947页

作者： Yong-Hsin Chen Chih-Jung yeh Gwo-Ping Jong Department of Occupational Safety and Health Chung Shan Medical University HospitalTaichung 40201Taiwan Department of Public Health Chung Shan Medical UniversityTaichung 40201Taiwan Department of Internal Medicine Chung Shan Medical University Hospital and Chung Shan Medical UniversityTaichung 40201Taiwan

BACKGROUND Needle stick and sharps injuries(NSIs)may cause infections among medical *** and overtime work among medical personnel increase the incidence of work *** To investigate whether overtime work and obesity increase the risk of *** This cross-sectional study used the data of 847 hospital personnel,including 104 doctors,613 nurses,67 medical laboratory scientists,54 specialist technicians,and nine surgical *** them,29 participants notified the hospital of having at least one NSI in *** data collected included age,overtime work,body mass index,medical specialty such as doctor or nurse,and professional grade such as attending physician or ***χ2 and Fisher’s exact tests were used to compare categorical *** logistic regression analysis and the Sobel test were used to assess the risk of *** Overtime work,body weight,and medical specialty were significantly associated with NSIs(P<0.05).After adjustment for risk factors,heavy overtime work was an independent risk factor for NSIs,and healthy body weight and nursing specialty were independent protective factors against *** adjustment for risk factors,medical personnel with healthy body weight has half as many NSIs as those with unhealthy body weight;the proportion of NSIs in doctors with healthy body weight was 0.2 times that in doctors with unhealthy body weight;the proportion of injuries among residents was 17.3 times higher than that among attending physicians;the proportion of injuries among junior nurses was 3.9 times higher than that among experienced nurses;the proportion of injuries among nurses with heavy overtime work was 6.6 times higher than that among nurses with mild overtime work;and the proportion of injuries among residents was 19.5 times higher than that among junior *** overtime work mediated the association of medical specialty with *** In addition to promoting the use of safety needles and pr

关键词： Medical staff Needle stick and sharps injuries Overtime work Healthy body weight Obesity

Microstructures and properties of cancellous bone of avascular necrosis of femoral heads

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

Acta Mechanica Sinica 2010年第1期26卷 13-19页

作者： Xuefeng Yao Peng Wang Ruchun Dai Hsien Yang yeh Dai Department of Engineering Mechanics AML Tsinghua University 100084 Beijing China Institute of Metabolism and Endocrinology The Second Xiang-Ya Hospital Central South University410011 Changsha China Department of Mechanical and Aerospace Engineering California State University Long Beach CA 90840-8305 USA

The aim of this study is to investigate microscopic structure and characterize cancellous bone of avascular necrosis of the femoral head （ANFH）. The rabbit model of the ANFH is established. The histopathologic features are studied successfully. The differences between the steroidinjection group （S.G.） and the controlled group （C.G.） are examined, including the weight of rabbits, the hematological examination and the three-dimensional stnactures. It is found that the plasma levels of cholesterol （CHO）, high-density lipoprotein （HDL） and low-density lipoprotein （LDL） in S.G. are lower than those in C.G. when the triglyceride （TG） increased in the S.G.; but the bone mineral content （BMC） and the structural model index （SMI） of the organ and tissue decreased significantly in S.G. Three-dimensional structures of the femoral head are obtained using micro-computed tomography （CT） scanning and the mechanical model is established to analyze the influences of these structural changes on the mechanical properties of the cancellous bone.

关键词： Avascular necrosis of the femoral head Cancellous bone Microstructure Mechanical properties

Role of hepatocyte nuclear factor 4-alpha in gastrointestinal and liver diseases

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第30期25卷 4074-4091页

作者： Matthew M yeh Dustin E Bosch Sayed S Daoud Department of Pathology University of Washington School of MedicineSeattleWA 98195United States Department of Medicine University of Washington School of MedicineSeattleWA 98195United States Department of Pharmaceutical Sciences Washington State University Health SciencesSpokaneWA 99210United States

Hepatocyte nuclear factor 4-alpha(HNF4α)is a highly conserved member of nuclear receptor superfamily of ligand-dependent transcription factors that is expressed in liver and gastrointestinal organs(pancreas,stomach,and intestine).In liver,HNF4αis best known for its role as a master regulator of liver-specific gene expression and essential for adult and fetal liver *** of HNF4αexpression has been associated with many human diseases such as ulcerative colitis,colon cancer,maturity-onset diabetes of the young,liver cirrhosis,and hepatocellular ***,the precise role of HNF4αin the etiology of these human pathogenesis is not well *** information is known about the role of HNF4αisoforms in liver and gastrointestinal disease *** is,therefore,a critical need to know how disruption of the expression of these isoforms may impact on disease progression and *** this review,we will update our current understanding on the role of HNF4αin human liver and gastrointestinal *** further provide additional information on possible use of HNF4αas a target for potential therapeutic approaches.

关键词： Hepatocyte nuclear factor 4-alpha Liver cirrhosis Hepatocellular carcinoma Viral hepatitis Gastrointestinal tract Colorectal carcinoma Transcription factor

A lightweight authentication scheme with user untraceability

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

Frontiers of Information Technology & Electronic Engineering 2015年第4期16卷 259-271页

作者： Kuo-Hui yeh Department of Information Management National Dong Hwa University Taiwan 974 Hualien

With the rapid growth of electronic commerce and associated demands on variants of Internet based applications,application systems providing network resources and business services are in high demand around the *** guarantee robust security and computational efficiency for service retrieval,a variety of authentication schemes have been ***,most of these schemes have been found to be lacking when subject to a formal security ***,Chang et al.(2014) introduced a formally provable secure authentication protocol with the property of ***,based on our analysis,the proposed scheme fails to provide the property of user-untraceability as claimed,and is insecure against user impersonation attack,server counterfeit attack,and man-in-the-middle *** this paper,we demonstrate the details of these malicious attacks.A security enhanced authentication scheme is proposed to eliminate all identified weaknesses.

关键词： Authentication Privacy Security Smart card Untraceability

A light-weight high-entropy alloy Al_(20)Be_(20)Fe_(10)Si_(15)Ti_(35)

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第2期61卷 184-188页

作者： tseng kokai yang yachu juan chienchang chin tsungshune tsai chewei yeh jienwei department of materials science and engineering 'national'tsing hua universityHsinchu 300TaiwanChina

A light-weight high-entropy alloy （LWHEA） A120Be20Fe10SilsTi35 has been developed to have unique mechanical properties and oxidation resistance. One major and two minor phases are observed in the as-east microstructure. The density of the alloy is 3.91 gcm-3, and its hardness is HV 911, which is higher than quartz. The hardness and hardness to density ratio are the highest of all light-weight alloys reported before. In addition, it has excellent oxidation resistance at 700℃ and 900℃, which far exceeds that of Ti-6A1-4V. Thus, the combination of properties is promising for high-temperature applications, which require light weight, wear-resistant and oxidation-resistant components.

关键词： high-entropy alloy light weight low density oxidation resistance

Intense blue-emitting Ca_2PO_4Cl:Eu^(2+) phosphor for near-ultraviolet converting white light-emitting diodes

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2010年第S1期28卷 250-253页

作者： Yi-Chen Chiu Chun-Kuei Chang Yao-Tsung yeh Shyue-Ming Jang Material and Chemical Research Laboratories Industrial Technology Research Institute Phosphors Research Laboratory and Department of Applied Chemistry National Chiao Tung University

A blue phosphor Ca2PO4Cl:Eu2+(CAP:Eu2+) was synthesized by solid state *** Ca2PO4Cl:Eu2+ exhibited high quantum efficiency and excellent thermal *** luminescent intensity of Ca2PO4Cl:Eu2+ was found to be 128% under excitation at 380 nm,149% under 400 nm,and 247% under 420 nm as high as that of BaMgAl10O17:Eu2+.The optimal doping concentration was observed to 11 mol.% of CAP:Eu2+.The energy transfer between Eu2+ ions in CAP were occurred via electric multipolar interaction,and the critical transfer distance was estimated to be 1.26 nm.A mixture of blue-emitting Ca2PO4Cl:Eu2+,green-emitting(Ba,Sr)2SiO4:Eu2+ and red-emitting CaAlSiN3:Eu2+ phosphors were selected in conjunction with 400 nm chip to fabricate white LED *** average color-rendering index Ra and correlated color temperature(Tc) of the white LEDs were found to be 93.4 and 4590 K,*** results indicated that it was a promising candidate as a blue-emitting phosphor for the near-UV white light-emitting diodes.

关键词： Ca2PO4Cl:Eu2+ phosphors luminscense rare earths

Combustion Synthesis of SiO_2 on the Aluminum Plate

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2001年第1期10卷 92-96,78页

作者： C.L.yeh E.Zhao 等 Dept.ofMechanicalEngineering Da－YehUniversityChang－Hwa51505Taiwan Dept.ofMechanicalEngineering Da－Y

The approach of utilizing combustion synthesis to make fine particles of SiO2, A12O3 and TiO2 is a quite modern technology. Through the chemical reaction in post-flame region, fine SiO2 particles can be formed with high purity on plate surface. Therefore, the combustion synthesis of SiO2 powders is an important area for further research and development especially for the application of SiO2 in the semiconductor industry. This investigation proposes an experimental approach （i.e., a gas-phase combustion synthesis） using two different kinds of organic compounds, Hexamethyldisilazane （HMDSA） and Hexamethyldisioxane （HMDSO）, as the silicon precursors. A premixed gas burner is chosen with C3H8 as fuel air as oxidant and part of the air was used as the carrying gas to entrain HMDSA/HMDSO vapor into the combustible mixture. Observations show that the C3H8/air flame changed color from a pale-blue flame to light yellow and then orange when different amounts of precursors were introduced. Through the chemical reaction in the post-flame region, fine SiO2 particles were formed in the gas phase and then quenched and collectal on an aluminum flat plate. The objective of this paper is to study the effects of HMDSO and HMDSA concentrations and flame temperatures on the synthesis of SiO2 particles.

关键词： combustion synthesis Hexamethyldisilazane Hexamethyldisioxane.

Synthesis and dissociation of soliton molecules in parallel optical-soliton reactors

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第7期10卷 1289-1303页

作者： Wenbin He Meng Pang Dung-Han yeh Jiapeng Huang Philip.St.J.Russell Max Planck Institute for the Science of Light Staudtstrasse 2 91058 ErlangenGermany Department of Physics Friedrich-Alexander-UniversitätStaudtstrasse 291058 ErlangenGermany State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Mode-locked lasers have been widely used to explore interactions between optical solitons,including bound-soliton states that may be regarded as“photonic molecules”.Conventional mode-locked lasers normally,however,host at most only a few solitons,which means that stochastic behaviours involving large numbers of solitons cannot easily be studied under controlled experimental *** we report the use of an optoacoustically mode-locked fibre laser to create hundreds of temporal traps or“reactors”in parallel,within each of which multiple solitons can be isolated and controlled both globally and individually using all-optical *** achieve on-demand synthesis and dissociation of soliton molecules within these reactors,in this way unfolding a novel panorama of diverse dynamics in which the statistics of multi-soliton interactions can be *** results are of crucial importance in understanding dynamical soliton interactions and may motivate potential applications for all-optical control of ultrafast light fields in optical resonators.

关键词： optical soliton solitons