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A StUDY ON tHE CHEMiCAL MECHANiSM FOR POWDER CORROSiON OF BRONZE ALLOY

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Science China Chemistry 1991年第10期34卷 1164-1173页

作者：范崇正王昌燧王胜君张懋森 W. t. CHASE 韩自强 the University of Science and technology of China Hefei 230026 PRC Arthur M.Sackler Gallery/Freer Gallery of Art Smithsonian institution Washington D.C 20560 USA Museum of Fuyang Fuyang 236004 PRC

A Cu-Sn-Pb alloy modelled after an antique was cast and the powder-corrosion (P-C) was prepared on it under simulated natural conditions. the main components of the corrosion are much like those of the ancient bronze powder corrosion. it is found that chloride, water and oxygen are the essential factors for P-C formation of which chlorine plays the most important role. According to the results of expriments and thermodynamic calculations, the chemical mechanism of the copper desease was studied. it is pointed out that the fast spread of P-C is caused by two vicious circles.

关键词： element line analysis crystal-gap corrosion groove vicious circle.

Obesity is associated with decreased risk of microscopic colitis in women

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World Journal of Gastroenterology 2022年第2期28卷 230-241页

作者： Robert S Sandler temitope O Keku John t Woosley Dale P Sandler Joseph A Galanko Anne F Peery Department of Medicine University of North CarolinaChapel HillNC 27514-7555United States Department of Medicine University of North CarolinaChapel HillNC 27514-7555United States Department of PathologyUniversity of North CarolinaChapel HillNC 27514United States Department of Health and Human Services National Institute of Environmental Health SciencesDurhamNC 27709United States

BACKGROUND Microscopic colitis is a leading cause of diarrhea in the older *** is limited information about risk *** hypothesized that obesity would be associated with microscopic *** to examine the association between obesity and microscopic colitis in men and women undergoing *** We conducted a case-control study at the University of North Carolina *** identified and enrolled men and women referred for elective,outpatient colonoscopy for chronic *** excluded patients with a past diagnosis of Crohn’s disease or ulcerative colitis.A research pathologist reviewed biopsies on every patient and classified them as microscopic colitis cases or non-microscopic colitis *** provided information on body weight,height and exposure to medications via structured interviews or internet based *** analysis included 110 patients with microscopic colitis(cases)and 252 nonmicroscopic colitis *** analyses were performed using logistic regression to estimate odds ratios and 95%confidence *** Cases were older and more likely than controls to be white *** subjects were well educated,but cases were better educated than *** with microscopic colitis had lower body mass index than controls and reported more weight loss after the onset of *** to patients who were normal or under-weight,obese(BMi>30 kg/m2)patients were substantially less likely to have microscopic colitis after adjusting for age and education,adjusted OR(aOR)0.35,95%confidence interval(Ci)0.18-0.66).When stratified by sex,the association was limited to obese women,aOR 0.21,95%Ci:*** with microscopic colitis were more likely to report weight loss after the onset of *** stratifying by weight loss,there remained a strong inverse association between obesity and microscopic colitis,aOR 0.33,95%Ci:0.10-1.11 among the patients who did not lose *** use of birth

关键词： Colitis Microscopic/epidemiology Humans Diarrhea/epidemiology Obesity

A COMPREHENSiVE tRAiNiNG FOR WAVELEt-BASED RBF CLASSiFiER FOR POWER QUALitY DiStURBANCES

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A COMPREHENSIVE TRAINING FOR WAVELET-BASED RBF CLASSIFIER FO...

the effect of wilderness and medical training on injury and altitude preparedness among backcountry hikers in Rocky Mountain National Park

2002年iEEE十区计算机、通信、控制和电机工程会议

作者： t.A.HOANG D.t.NGUYEN University of tasmania - Australia GPO Box 252-65 Hobart tasmania 7001-Australia University of tasmania - Australia GPO Box 252-65 Hobart tasmania 7001-Australia

in this paper we demonstrate that the dominantfrequencies and Lipschitz exponents in non-stationarv andtransitory power quality disturbances. effciently extractedfrom their wavelet transform modulus maxima (WtMM)in the time-scale domain. can serve as powerfuldiscriminating features for wavelet-based classification ofthese disturbances. We also propose a comprehensive"Knowledge-based" algorithm for the training of the radialbasis function (RBF) network classifier so that at itsconvergence. the network gives both the optimal featureweight vector as well as the cluster centres and scalingwidths.

关键词： Wavelets Radial Basis Function Networks Pattern Classification Power Quality Disturbances

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World Journal of Emergency Medicine 2018年第3期9卷 172-177页

作者： Michael D.t.Yue David W.Spivey Daniel B.Gingold Douglas G.Sward University of Maryland School of Medicine BaltimoreMarylandUSA Department of Emergency Medicine University of Maryland School of MedicineBaltimoreMarylandUSA Division of Hyperbaric Medicine Program in TraumaUniversity of Maryland Medical CenterBaltimoreMarylandUSA

BACKGROUND:the purpose of this study was to document the correlation between medical and wilderness training with levels of preparedness for acute mountain sickness(AMS),illness,and injury among backcountry ***:We conducted a cross-sectional,convenience survey in Rocky Mountain National Park in July and August *** study group consisted of 380 hikers who completed a written survey that collected information about demographics,wilderness experience,altitude experience,hiking equipment,communications devices,and trip ***:Factors such as wilderness training(wilderness first aid[WFA],wilderness first responder[WFR],or wilderness emergency medical technician[WEMt]),wilderness experience,and altitude experience all affected hikers’emergency *** with medical training were more prepared to avoid or respond to AMS(62.3%vs.34.3%[Pthey were also more prepared to avoid or manage injury/illness than hikers without medical training(37.7%vs.20.7%[P=0.003]).Participants with wilderness training were more likely to be prepared to avoid or respond to AMS(52.3%vs.36.8%[P=0.025])but not significantly more likely to be prepared to manage illness/injury(31.8%vs.22.0%[Pting for experience,wilderness training,age,and gender,we found that medical training was associated with increased preparedness for AMS(OR2.72;95%Ci 1.51–4.91)and injury/illness(OR 2.71;95%Ci 1.5–4.89).CONCLUSiON:Medically trained hikers were more likely to be prepared to avoid or manage AMS,medical emergencies,and injuries than their non-medically trained *** training increased hikers’preparedness for AMS but did not significantly alter preparedness for illness/injury.

关键词： Hiking wilderness Acute mountain illness injury training

MHD flow of a nanofluid in an expanding or contracting porous pipe with chemical reaction and heat sourcelsink

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Propulsion and Power Research 2016年第2期5卷 134-148页

作者： S.Srinivas A.Vijayalakshmi A.Subramanyam Reddy t.R.Ramamohan Department of Mathematics School of Advanced SciencesVIT UniversityVellore 632014India CSiR Fourth Paradigm nstitute(Formerly CSIR Center for Mathematical Modeling and Computer Simularion)Wind Tunnel Road.Bangalore 560037India

in the present investigation,an analytical analysis has been carried out to study theinfluence of chemical reaction on MHD flow of a nanofluid in an expanding or contractingporous pipe in the presence of heat *** pipe wall expands or contracts uniformlyat a time dependent *** transfomations have been invoked to reduce the governingflow equations into coupled nonlinear ordinary differential *** analytical approach,namely the homotopy analysis method(HAM)is employed to obtain the analytical solutions ofthe ordinary differential *** convergence of the obtained series solutions *** effects of various physical parameters such as wall expansion ratio,Brownianmotion parameter,thermophoresis parameter,Lewis number,chemical reaction parameter andheat sourcelsink parameter on flow variables have been ***,for the case ofhydrodynamic viscous fluid,we find a good agreement between the HAM solutions andsolutions already reported in the literature.

关键词： Porous pipe Chemical reactionparameter Brownian motionparameter thermophoresis parameter Lewis number

X-ray Computed tomography Characterization of 3D tufted twill textile Composite for Aerostructures

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Journal of Harbin institute of technology(New Series) 2019年第3期26卷 7-13页

作者： A.Saboktakin M.Shahrouz t.Vu-Khanh J.Bicerano Department of Mechanical Engineering University of Sistan and Baluchestan Zahedan Iran Department of Mechanical Engineering Ecole de Technologie Supérieure Montreal Que. Canada Bicerano & Associates Consulting Savannah Georgia USA

Damage assessments in three dimensional (3D) textile composites subjected to mechanical loading can be performed by non-destructive and destructive *** paper applies the two techniques to investigate the fracture behavior of 3D tufted textile composites.X-ray computed tomography as a non-destructive evaluation method is appropriate to detect damage locations and identify their progression in 3D textile *** methods such as sectioning toward observing damage provide valuable information about damage *** results of this research could be utilized to evaluate the initial cause of rupture in 3D tufted composites used in aerospace structures and analyze fracture modes and damage progression.

关键词： X-ray computed tomography damage characterization 3D composite textile preform

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冻土解冻后的沉降预测(英文)

黑龙江大学工程学报 2014年第3期5卷 23-26页

作者： Kotov P.i. Roman L.t. tsarapov M.N. 莫斯科大学地质学院冻土系

总结了原状土的变形特性和物理性能的研究结果 (400个试验),描述了西伯利亚北部和俄罗斯的欧洲地区。在冻土物理性质和变形特征的相关性的基础上,提出了冻土融冻的计算公式。

关键词：土壤解冻解冻系数压缩系数沉降预测

in vitro cytotoxicity of indonesian stingless bee products against human cancer cell lines

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Asian Pacific Journal of tropical Biomedicine 2014年第7期4卷 549-556页

作者： Paula M.Kustiawan Songchan Puthong Enos t.Arung Chanpen Chanchao Program in Biotechnology Faculty of ScienceChulalongkorn University Department of Forest Product technology Faculty of Forestry.Mulawarman University institute of Biotechnology and Genetic Engineering Chulalongkorn University Department of Biology.Faculty of Science Chulalongkorn University

Objective:to screen crude extracts of propolis,bee pollen and honey from four stingless bee species[trigona incisa(***)],timia apicalis,trigona fuso-baltata and trigona filscibasis)native to East *** for cytotoxic activity against five human cancer cell lines(HepG2,SW620,ChaGo-1,KAtO-Ⅲand Bt474).Methods:All samples were extracted with methanol,and then subpartitioned with n-hexane and ethyl *** crude extract was screened at 20μg/mL for in vitro cytotoxicity against the cell lines using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide *** addition,four previously shown bioactive components from propolis(apigenin,cafieic acid phenyl ester,kaempferol and naringenin)and two chemotherapeutic drugs(doxorubicin and 5-fluorouracil)were used to evaluate the sensitivity of the cell ***:Overall,crude extracts from propolis and honey had higher cytotoxic activities than bee pollen,but the activity was dependent upon the extraction solvent,bee species and cell *** extracts from *** and tarda apicalis showed the highest and lowest cytotoxic activity,*** the HepG2 cell line was broadly sensitive to the honey *** pure compounds,doxorubicin was the most cytotoxic,the four propolis compounds the least,but the ChaGo-i cell line was sensitive to kaempferol at 10μg/mL and KAtO-Ⅲwas sensitive to kaempferol and apigenin at 10μg/mL,.All pure compounds were effective against the Bt474 cell ***:Propolis from f,incisa and trigona fusco-balteata contain an in vitro cytotoxic activity against human cancer cell *** study is required,including the isolation and characterization of the active antiproliferative agent(s).

关键词： Antiproliferative activity Bee product Cancer cell lines Cytotoxicity Ethyl acetate extract n-Hexane Honey Methanol Propolis

iNtERRUPtiON StUDY OF ViREMiA OF PAtiENtS WitH HEMORRHAGiC FEVER WitH RENAL SYNDROME iN tHE FEBRiLE PHASE

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中华医学杂志(英文版) 1991年第2期104卷 149-153页

作者： Yang Zhan-qiu Zhang tien-ming Zhang Mei-ying Zheng Zhi-ming Hu Zhen-jiao Qu Chun-feng Xiang Jin-min John W Huggins t. M. Cosgriff J. i. Smith 430071 U. S. Army Medical Research institute of infectious Diseases Fort Detrick MD U.S.A.

Kinetic changes of viremia were observed in 287 cases of hemorrhagic fever with renal syndrome (HFRS) in whom ribavirin was administered with double blind random control studied by means of virus isolation, indirect immunofiuorescence assay and enzyme-linked immunosorbent assay. the positive rate of viremia was 79.7% (Sp=3%) and positive rate of HERS igM was 85% (Sp=3.1%) before treatment. Viremia could be interrupted by ribavirin as in the ribavirin treated group, the viremia positive rate decreased, duration of viremia was shortened, viral antigen products, virus fiter and HFRS igG antibody level were reduced as compared with the control group. this showed that viremia was very frequent in patients in the febrile phase and ribavirin is an effective antiviral drug in HFRS during the febrile phase. Dosage and course of treatment of this drug are discussed.

关键词： RiBAViRiN