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cO_2 laser-micro plasma arc hybrid welding for galvanized steel sheets

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Transactions of Nonferrous Metals Society of china 2011年第A1期21卷 47-53页

作者： c.H.KIM Y.N.AHN J.H.KIM Advance Welding & Joining Research Group Korea Institute of Industrial Technology Incheon 406-840 South Korea

A laser lap welding process for zinc-coated steel has a well-known unsolved problem-porosity formation. The boiling temperature of coated zinc is lower than the melting temperature of the base metal, which is steel. In the autogenous laser welding, the zinc vapor generates from the lapped surfaces expels the molten pool and the expulsion causes numerous weld defects, such as spatters and blow holes on the weld surface and porosity inside the welds. The laser-arc hybrid welding was suggested as an alternative method for the laser lap welding because the arc can preheat or post-beat the weldment according to the arrangement of the laser beam and the arc. cO2 laser-micro plasma hybrid welding was applied to the lap welding of zinc-coated steel with zero-gap. The relationships among the weld quality and process parameters of the laser-arc arrangement, and the laser-arc interspacing distance and arc current were investigated using a full-factorial experimental design. The effect of laser-arc arrangement is dominant because the leading plasma arc partially melts the upper steel sheets and vaporizes or oxidizes the coated zinc on the lapped surfaces. compared with the result from the laser-TIG hybrid welding, the heat input from arc can be reduced by 40%.

关键词： galvanized steel cO2 laser micro plasma hybrid welding

Biomarkers of end of shift exposure to disinfection byproducts in nurses

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Journal of Environmental Sciences 2017年第8期29卷 217-223页

作者： Solomon Ioannou Xanthi D.Andrianou Pantelis charisiadis Konstantinos c.Makris cyprus International Institute for Environmental and Public Health Cyprus University of Technology Limassol 3041 Cyprus

Increased disinfectant use commonly takes place in hospitals and other health care settings. A cross-sectional study among active nurses in two cypriot public hospitals（n = 179） was conducted to examine the prevalence of exposure to disinfection byproducts（DBPs）, such as trihalomethanes（THMs） using both self-reported information and biomarker *** objectives of this study were to： i） quantify the magnitude and variability of occupational exposure to disinfectants/DBPs in nurses, ii） generate job exposure matrices（JEM） and job task exposure matrices（JTEM） for disinfectants, and iii） assess the major determinants of urinary THMs in nurses. End of shift urinary total THM values showed high variability among the nurses, but did not differ between hospitals. The disinfectant group of alcohols/phenols was used by 〉 98% of nurses, followed by octenidine（82%）, iodine and chlorine（39%, each）,chlorhexidine（25%）, formaldehyde（12%）, hydrogen peroxide（11%）, and peracetic acid/ammonia/quaternary ammonium compounds（QAcs）, all being 〈 8% each. chlorine use during the past 24 hr was associated with significantly（p 〈 0.05） lower brominated THMs（Br THMs） after adjusting for age, gender and BMI, while a positive association was shown for TcM and the sum of all THMs（TTHMs）, albeit not significant. Nurses were exposed to nearly double the levels of TTHMs and BrT HMs（median and IQR, 1027 [560, 2475] ng/g and 323 [212,497] ng/g, respectively） when compared to those of the general population（552 [309,989] ng/g and 152 [87,261] ng/g, respectively）. This was the first occupational health dataset reporting measurements of biomarkers of end of shift exposures to disinfectants/DBPs.

关键词： Nurses disinfectants disinfection Exposure Biomarker Job exposure matrix Healthcare

cLUSTERING PATENTS USING NON-EXHAUSTIVE OVERLAPS

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Journal of Systems Science and Systems Engineering 2010年第2期19卷 162-181页

作者： charles V. TRAPPEY Amy J.c. TRAPPEY chun-Yi WU Department of Management Science National Chiao Tung University Taiwan China Department of Industrial Engineering & Management National Taipei University of Technology Taiwan China Department of lndustrial Engineering & Engineering Management National Tsing Hua University Taiwan China

Patent documents are unique external sources of information that reveal the core technology underlying new inventions. Patents also serve as a strategic data source that can be mined to discover state-of-the-art technical development and subsequently help guide R＆D investments. This research incorporates an ontology schema to extract and represent patent concepts. A clustering algorithm with non-exhaustive overlaps is proposed to overcome deficiencies with exhaustive clustering methods used in patent mining and technology discovery. The non-exhaustive clustering approach allows for the clustering of patent documents with overlapping technical findings and claims, a feature that enables the grouping of patents that define related key innovations. Legal advisors can use this approach to study potential cases of patent infringement or devise strategies to avoid litigation. The case study demonstrates the use of non-exhaustive overlaps algorithm by clustering US and Japan radio frequency identification （RFID） patents and by analyzing the legal implications of automated discovery of patent infringement.

关键词： Data mining patent analysis patent infringement non-exhaustive overlap clustering ontology schema

Damage prediction of 7025 aluminum alloy during equal-channel angular pressing

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 990-998页

作者： M.Ebrahimi Sh.Attarilar c.Gode F.Djavanroodi Department of Mechanical Engineering Iran University of Science and Technology Department of Materials Engineering Sahand University of Technology School of Denizli Vocational Technology Program of Machine Pamukkale University Department of Mechanical Engineering Imperial College

Equal-channel angular pressing （EcAP） is a prominent technique that imposes severe plastic deformation into materials to en- hance their mechanical properties. In this research, experimental and numerical approaches were utilized to investigate the mechanical prop- erties, strain behavior, and damage prediction of EcAPed 7025 aluminum alloy in various conditions, such as die channel angle, outer comer angle, and friction coefficient. Experimental results indicate that, after the first pass, the yield strength, ultimate tensile strength, and hardness magnitude are improved by approximately 95%, 28%, and 48.5%, respectively, compared with the annealed state, mainly due to grain re- finement during the deformation. Finite element analysis shows that the influence of die channel angle is more important than that of outer comer angle or friction coefficient on both the strain behavior and the damage prediction. Also, surface cracks are the main cause of damage during the EcAP process for every die channel angle except for 90°; however, the cracks initiated from the neighborhood of the central re- gions are the possible cause of damage in the EcAPed sample with the die channel angle of 90°.

关键词： aluminum alloys equal-channel angular pressing materials damage strain distribution mechanical properties

Spectroscopy of a Gamma Irradiated Poly(Acrylic Acid)-clotrimazole System

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chinese Physics Letters 2011年第12期28卷 274-277页

作者： M.Todica c.V.Pop Luciana Udrescu Traian Stefan Faculty of Physics Babes-Bolyai University400084 Cluj-NapocaRomania

A poly(acrylic acid)-clotrimazole system,gamma irradiated at different doses,is investigated by Raman *** of the spectrum of the polymeric matrix appear for doses of radiation greater than 333 Gy,whereas the spectrum of clotrimazole remains unaffected at these doses of *** changes correlate with modification of the vibration modes of cOOH and cH_(2) groups of a polymeric matrix after irradiation.

关键词： spectroscopy polymeric matrix

A qualitative study on the pulsatile flow phenomenon in a dense fly ash pneumatic conveyor

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Particuology 2014年第6期12卷 81-91页

作者： Wei chen Kenneth c.Williams Isabel Jabs mark G.Jones centre for Bulk Solids and Particulate Technologies Newcastle Institute for Energy and ResourcesThe University of Newcastle Faculty of Mechanical Engineering Leibniz University of Hanover

Understanding of the dynamic particulate flow structures within a dense gas-fly ash pneumatic conveyor must be improved in order to better aid its design *** complex pulsatile movement of the gas-fly ash mixture dominates the flow performance within the pipeline,and historically,non-invasive measurement devices such as the electrical capacitance tomography（EcT） were often used to sufficiently capture the flow ***,inadequate studies have been conducted on the pulsatile flow phenomenon,which directly relate to the gas-fly ash two-phase flow *** paper aims to investigate the pulsatile flows using an EcT ***,pulsatile flow patterns under various experimental conditions were obtained through *** within a flow were then characterised into pulse growth and decay segments,which represent the superficial fluidisation and deaeration processes during ***,structural and statistical analyses were performed on the pulse growth and decay *** suggested that the increasing air mass flow rate led to the decrease of the superficial fluidisation/deaeration magnitude,however,the increase of the superficial fluidisation/deaeration ***,the air mass flow rate was indicated as the dominant factor in determining the pulsing statistical *** research provides fundamental insights for further modelling the dense fly ash pneumatic flows.

关键词： Pneumatic conveying Electrical capacitance tomography Fly ash Pulsatile flows Flow pattern analysis

cO_2 adsorption using TiO_2 composite polymeric membranes:A kinetic study

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Journal of Environmental Sciences 2015年第9期27卷 163-171页

作者： Sarah Hafeez X.Fan Arshad Hussain c.F.martín School of chemical and Materials Engineering (ScME) National University of Sciences & Technology Institute for Materials and Processes School of Engineering University of Edinburgh University of Aberdeen School of Engineering Fraser Noble Building King's College

cO2is the main greenhouse gas which causes global climatic changes on larger scale. Many techniques have been utilised to capture cO2. Membrane gas separation is a fast growing cO2 capture technique, particularly gas separation by composite membranes. The separation of cO2 by a membrane is not just a process to physically sieve out of cO2 through the controlled membrane pore size. It mainly depends upon diffusion and solubility of gases, particularly for composite dense membranes. The blended components in composite membranes have a high capability to adsorb cO2. The adsorption kinetics of the gases may directly affect diffusion and solubility. In this study, we have investigated the adsorption behaviour of cO2 in pure and composite membranes to explore the complete understanding of diffusion and solubility of cO2 through membranes. Pure cellulose acetate（cA） and cellulose acetatetitania nanoparticle（cA-TiO2） composite membranes were fabricated and characterised using SEM and FTIR analysis. The results indicated that the blended cA-TiO2 membrane adsorbed more quantity of cO2 gas as compared to pure cA membrane. The high cO2 adsorption capacity may enhance the diffusion and solubility of cO2 in the cA-TiO2 composite membrane, which results in a better cO2 separation. The experimental data was modelled by Pseudo first-order, pseudo second order and intra particle diffusion *** to correlation factor R2, the Pseudo second order model was fitted well with experimental data. The intra particle diffusion model revealed that adsorption in dense membranes was not solely consisting of intra particle diffusion.

关键词： Global warming cellulose acetate Gas adsorption Pseudo order models cO2 Ti O2

Static and cyclic oxidation of Nb-cr-V-W-Ta high entropy alloy in air from 600 to 1400℃

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Journal of Materials Science & Technology 2020年第3期38卷 189-196页

作者： S.K.Varma Francelia Sanchez Sabastian Moncayo c.V.Ramana Department Metallurgical Materials and Biomaterials EngineeringThe University of Texas at El PasoEl PasoTX79968-0520USA center for Advanced Materials Research(cMR) The University of Texas at El PasoEl PasoTX79968-0520USA

An oxidation resistance study has been made on Nb-cr-V-W-Ta high entropy alloy in a range of temperature from 600 to 1400℃in *** oxidation study has been performed for either(a)12 or 24 h of heating time or(b)3 or 10℃/min heating rates to the desired oxidation *** oxidation study conducted for three and a half days has been conducted at 600,700,and 800℃using 12 h of heating *** alloy can withstand the cyclic oxidation process with only a reasonable loss of *** identification of oxides indicates crystals of W and Ta oxides in cylindrical form while Nb and cr oxides show a nodular or granular morphology at both 1000 and 1200℃while and additional of oxide of V in whisker forms at 1200℃.

关键词： High entropy alloys Nb-cr-V-W-Ta Microstructures Oxidation

correction to:Metformin activates chaperone-mediated autophagy and improves disease pathologies in an Alzheimer disease mouse model

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Protein & cell 2022年第3期13卷 227-229页

作者： Xiaoyan Xu Yaqin Sun Xufeng cen Bing Shan Qingwei Zhao Tingxue Xie Zhe Wang Tingjun Hou Yu Xue Mengmeng Zhang di Peng Qiming Sun cong Yi Ayaz Najafov Hongguang Xia Department of Biochemistry&Research center of clinical Pharmacy of The First Affiliated Hospital Zhejiang University School of MedicineHangzhou 310058China Liangzhu Laboratory Zhejiang University Medical CenterHangzhou 311121China Department of cell Biology Harvard Medical SchoolBostonMA 02115USA Interdisciplinary Research center on Biology and chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 201203China college of Pharmaceutical Sciences Hangzhou Institute of innovative MedicineZhejiang UniversityHangzhou 310058China Key Laboratory of Molecular Biophysics of Ministry of Education Hubei Bioinformatics and Molecular Imaging Key LaboratoryCollege of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

cORREcTION TO:PROTEIN cELL HTTPS://***/10.1007/S13238-021-00858-3 In legend of figure 1,this sentence“(c)293THK cells were treated as in a”should be corrected as“(c)293THK cells were treated as in(A)”.In legend of figure 2,“E-64D(10μmol/L)”in description of panel(B)should be *** section“Metformin activates chaperone-mediated autophagy”of RESULTS,E-64D in sentence“Metformininduced degradation of HK2 and PKM2 was blocked by lysosomal inhibitors(E-64D,Bafilomycin A1 and Leupeptin+NH4cl)”should be removed.

关键词： Metformin Alzheimer removed