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Investigation of the perform.nce of a pilot-scale barrel atm.spheric plasm. system.for plasm. activation of polym.r particles

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Nanotechnology and Precision Engineering 2019年第1期2卷 1-7页

作者： Hisham.m.Abourayana Peter J.Dobbyn pat Whyte Denis P.Dowling Surface Engineering Group School of Mechanical and Materials Engineering University College Dublin Irish m.cro m.uldings Inverin Co.

This study reports the developm.nt and perform.nce of a pilot-scale barrel atm.spheric plasm. reactor for the atm.spheric plasm. activation treatm.nt of polym.r particles. The polym.r particles treated included acrylonitrile butadiene styrene(ABS) and polypropylene(PP). These particles had diam.ters in the range of 3–5 m.. The initial studies were carried out using a laboratory-scale barrel reactor designed to treat polym.r particle batch sizes of 20 g. A pilot-scale reactor that could treat 500 g particle batch sizes was then developed to facilitate pre-industrial-scale treatm.nts. The effect of operating pulse density m.dulation(PDm. in the range 10%–100% and plasm. treatm.nt tim. on the level of activation of the treated polym.rs were then investigated. ABS revealed a larger decrease in water contact angle com.ared with PP after plasm. treatm.nt under the sam. conditions. The optim.l treatm.nt tim. of ABS(400 g of polym.r particles) in the pilot-scale reactor was 15 m.n. The plasm.-activated polym.r particles were used to fabricate dog-bone polym.r parts through injection *** testing of the resulting dog-bone polym.r parts revealed a 10.5% increase in tensile strength com.ared with those fabricated using non-activated polym.r particles.

关键词： Atm.spheric pressure plasm. Barrel plasm. reactor Polym.r particles Water contact angle X-ray photoelectron spectroscopy Injection m.ulding

Extra dim.nsions and atom.c transition frequencies

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Chinese Physics B 2008年第1期17卷 70-75页

作者：李志刚倪维斗 Antonio Pulido patón Center for Gravitation and Cosm.logy Purple Mountain ObservatoryChinese Academy of Sciences

New unification theories predict large extra dim.nsions （LEDs）. If that is the case, gravity would be stronger at short ranges than what Newtonian gravity predicts. LEDs could also have effects at atom.c level. In this paper we propose a new m.thod to constrain the size of ‘gravity-only’ LEDs by analysing how these LEDs m.dify the energy of the atom.c transitions 1s-2s and 2s-2p （Lam. shift）, in the particular case of the hydrogen and m.onium.atom.. We estim.te these effects by using Bethe＇s non-relativistic treatm.nt of Lam. shift. In the particular case of three LEDs, which m.y be a candidate to explain the interaction m.chanism.of dark m.tter particles, we have found that current knowledge in atom.c spectroscopy could constrain their sizes to less than 10 μm. Although our contributions do not reach the sensitivity given by SN1987a, they are still slightly better than recent constraints given by Inverse Square Law tests of the Eoet-Wash group at Washington University, which gave R3 〈 36.6 μm.

关键词： large extra dim.nsions Lam. shift atom.c spectroscopy

Vastly Synergistic Fe_(2)CuNiS_(4)-Nanoarchitectures Anchored 2D-Nano-Sandwich Derived from.Flower-Like-CuFeS_(2)/N-Graphene and Cube-Like-NiFeS_(2)/N-CNTs for Water Oxidation and Nitrophenol Reduction

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Energy & Environm.ntal m.terials 2024年第6期7卷 274-289页

作者： Gopiram.n m.yakrishnan Ram.um.r Vanaraj Junpeng Xiong m.ham.ad Farooq Azeem.Ullah Keqin Zhang Seong Cheol Kim.ick Soo Kim Nano Fusion Technology Research Group Division of Molecules and PolymersInstitute for Fiber Engineering(IFES)Interdisciplinary Cluster for Cutting Edge Research(ICCER)Shinshu UniversityTokida 3-15-1UedaNagano 386-8567Japan School of Chem.cal Engineering Yeungnam UniversityGyeongsan 38541Korea Graduate School of m.dicine Scienceand TechnologyShinshu UniversityTokida 3-15-1UedaNagano 386-8567Japan National Engineering Laboratory for m.dern Silk College of Textile and Clothing EngineeringSoochow UniversitySuzhou 215123China

Surface area,pore properties,synergistic behavior,hom.genous dispersion,and interactions between carbon m.trix and m.tal-nanostructures are the key factors for achieving the better perform.nce of carbon-m.tal based(electro)***,the traditional hydro-or solvotherm.l preparation of(electro)catalysts,particularly,bi-or tri-m.tallic nanostructures anchored graphene(G)or carbon nanotubes(CNTs),often pose to poor m.tal–support interaction,low synergism.and patchy *** first,bim.tallic flower-like-CuFeS_(2)/NG and cube-like-NiFeS_(2)/NCNTs nanocom.osites were prepared by solvotherm.l *** resultant bim.tallic nanocom.osites were em.loyed to derive the 2D-nano-sandwiched Fe_(2)CuNiS_(4)/NGCNTs-SW(electro)catalyst by a very sim.le and green urea-m.diated“m.x-heat”*** desired physicochem.cal properties of Fe_(2)CuNiS_(4)/NGCNTs-SW such as m.ltiple active sites,strong m.tal-support interaction,hom.genous dispersion and enhanced surface area were confirm.d by various m.croscopic and spectroscopic *** the best of our knowledge,this is the first urea-m.diated“m.x-heat”m.thod for preparing 2D-nano-sandwiched carbon-m.tal-based(electro)*** Fe_(2)CuNiS_(4)/NGCNTs-SW was found to be highly effective for alkaline-m.diated oxygen evolution reaction at low onset potential of 284.24 m.,and the stable current density of 10 m. cm.(−2) in 1.0 m.KOH for 10 ***,the Fe_(2)CuNiS_(4)/NGCNTs-SW dem.nstrated excellent catalytic activity in the reduction of 4-nitrophenol with good kapp value of 87.71×10^(−2)s^(-1)and excellent reusability over five ***,the developed urea-m.diated“m.x-heat”m.thod is highly efficient for the preparation of m.tal-nanoarchitectures anchored 2D-nano-sandwiched(electro)catalysts with high synergism.uniform.dispersion and excellent m.tal-support interaction.

关键词： (electro)catalyst m.tal-sulfide nanoarchitectures m.x-heat N-graphene/NCNTs synergistic effect urea

Nitrogen-and Oxygen-Containing Porous Ultrafine Carbon Nanofiber:A Highly Flexible Electrode m.terial for Supercapacitor

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Journal of m.terials Science & Technology 2017年第5期33卷 424-431页

作者： Kai Wei Kyu-Oh Kim.Kyung-Hun Song Chang-Yong Kang Jung soon Lee m.yakrishnan Gopiram.n ick-Soo Kim College of Textile and Clothing Engineering Soochow UniversitySuzhou215021China Nano Fusion Technology Research Group Division of Frontier FibersInstitute for Fiber Engineering(IFES)Interdisciplinary Cluster for Cutting Edge Research(ICCER)Shinshu UniversityTokida 3-15-1UedaNagano Prefecture386-8567Japan Departm.nt of Fiber System.Engineering Dankook UniversityYoungin 448-701Republic of Korea Departm.nt of Clothing&Textiles PaiChai UniversityDaejeon 302-735Republic of Korea Departm.nt of m.tallurgical Engineering Pukyong National UniversityBusan 608-739Republic of Korea Departm.nt of Clothing and Textiles Chungnam National UniversityDaejeon 305-764Republic of Korea

Herein, we report a sim.le and effective preparation of ultrafine CNFs （u-CNFs） with high surface area via electrospinning of two im.iscible polym.rs [polyacrylonitrile （PAN） and poly（m.thyl m.thacry- late）（Pm.A）] followed by calcination at high tem.erature in an inert atm.sphere. Various electrospinning conditions were optim.zed in detail. Four different kinds of PAN/Pm.A ratios （10/0, 7：3, 5：5 and 3：7） were chosen and found that the PAN/Pm.A ratio of 3：7 （PAN/Pm.A-3：7） is the optim.m.one. BET anal- ysis showed the specific surface area of the u-CNFs-3：7 was 46Z57 m./g with an excellent pore volum. （1.15 cm. g-l） and an average pore size （9.48 nm.： it is about 25 tim.s higher than the conventional CNFs （c-CNFs）. TEm.and FE-SEm.im.ges confirm.d the ultrafine structure of the CNFs with a thinner fiber di- am.ter of-50 nm. The graphitic nature and atom.c arrangem.nt of the u-CNFs were investigated by Ram.n and XPS analyses. For the supercapacitor application, unlike the com.on electrode preparation m.thods, the u-CNFs-3：7 was used without any activation, chem.cal or m.chanical m.difications. The u-CNFs- 3：7 showed a better specific capacitance of 86 Fig in 1 m.l/L 1-12S04 when com.ared to pure CNFs. The excellent physicochem.cal properties m.ke the u-CNFs-3：7 an alternative choice to the existing CNFs for the supercapacitors.

关键词： Carbon fiber Porosity Electron m.croscopy Surface analysis Supercapacitor

Dose Adjustm.nt for Norm.l Eating: Longer Term.Perspectives of Adults with Type 1 Diabetes

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Journal of Diabetes m.llitus 2014年第3期4卷 179-188页

作者： pat Rapley Stephanie Axon Gwen Babel Krystina Creighton Joey m. Kaye Suzanne Brown Centre for Nursing Research Sir Charles Gairdner Hospital Perth Australia Departm.nt of Endocrinology and Diabetes Sir Charles Gairdner Hospital Perth Australia

Aim.?To explore the longer term.blood glucose self-m.nitoring outcom.s and frequency of m.nitoring for outpatients with diabetes type 1 after com.letion of the Dose Adjustm.nt for Norm.l Eating (DAFNE) course. The hypothesis was that DAFNE outcom.s would differ according to frequency of glucose ***:?A?sequential data-triangulation design using existing?baseline (T0) and 12-m.nths (T12)?DAFNE course data and interview data from.12 random.y selected participants who had com.leted the course two years ago.?Results: Age range was 23 to 70 years with HbA1c 6.1% to 12.6% at T0?and 6.1% to 11.4% at T12. Com.arisons of HbA1c, PAID, HAD subscales?anxiety?and?depression,?and covariate data between T0?and T12indicatedsignificant reductions in the m.an depression and PAID scores (both?P?m.s or three or m.re tim.s per day, changes were not significantly different. For both groups, the trend between T0?and T12?was downwards for change in m.an blood glucose level and all survey scales. The proportion of all participants with T12?HbA1c at or below their T0?value was greater than 50% (Proportion = 69%, 95% CI: 56% - 79%) but only the highest HbA1c tertile group showed a significant difference (P?= 0.003). There was an average decrease in the incidence of hypoglycaem.c events of 0.6 overall: The greatest change was for the high HbA1c tertile with a m.an decrease of 0.8. The interview data suggested that DAFNE graduates experim.nted m.re with food, exercise, and insulin;gained knowledge;learnt personal body needs;increased awareness of blood glucose level;gained confidence and im.roved their quality of life. Conclusions: There was insufficient evidence to conclude that frequency of blood glucose m.nitoring influenced m.tabolic control. However, people with type 1 diabetes who undertake the less restricted DAFNE approach to diabetes self-m.nagem.nt can im.rove their qualit

关键词： DAFNE Adults Type 1 Diabetes Long Term

Com.arison of optical detection system.PVDF detection system.and PVDF needle hydrophone for optoacoustic tom.graphy

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Chinese Optics Letters 2005年第10期3卷 593-596页

作者： m. D. Abolhassani m. Hejazi A. Ahm.dian A. Am.adi m.dical Physics and Bioengineering Departm.nt Faculty of Medicine Tehran University of Medical Sciences Tehran Iran & Research Centre for Science and Technology in m.dicine RCSTIM Institute of Physics Sharif University Tehran Iran

Optoacoustic tom.graphy （pat） is a two-dim.nsional m.dical im.ging m.thod that has the advantage of optical contrast and resolution of ultrasonic waves. The detection system. with a high sensitivity can be used for detecting sm.ll tum.rs, located deeply in hum.n tissues, such as the breast. In this study, the sensitivity of existing ultrasonic detection system. has been com.ared experim.ntally with that by using therm.elastic waves as a broadband ultrasonic source. For the com.arison, an optical stress transducer （OST）, a polyvinylidene difluoride （PVDF） sheet and a calibrated PVDF needle hydrophone were used. To ensure all of the detection system. interrogated by the sam. ultrasonic field, a sm.ll optical instrum.nt that fixed the generating laser head was constructed. The sensitivity was evaluated by m.asuring signalto-noise ratios （SNRs） and noise equivalent pressures （NEPs）. The PVDF system. with a 4-kPa NEP has a 22 dB better perform.nce than the OST. The OST showed nearly the sam. sensitivity as the hydrophone for detecting ultrasound waves at a 1-cm.distance in water. PVDF detection system.provides a useful tool for im.ging of soft tissues because of its high sensitivity and broad detection range.

关键词： PVDF Com.arison of optical detection system.PVDF detection system.and PVDF needle hydrophone for optoacoustic tom.graphy

A sim.lation study of using active traffic m.nagem.nt strategies on congested freeways

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Journal of m.dern Transportation 2012年第3期20卷 178-184页

作者： Ram.krishna VADDE Joseph O. SAI m.ham.ed A. FARUQI pat T. LEELANI Texas A&m.University-Kingsville Department of Civil Engineering MSC 194Kingsville Texas 78363 USA

The m.in objective of this study is to evaluate the effectiveness of using active traffic m.nagem.nt （ATm. strategies on freeways in term. of the driver＇s behavior and operational im.acts. A few test beds were selected to evaluate the im.acts of ATm.such as speed harm.nization, shoulder utilization, and ram. m.tering. Test beds used in this study were at places where an ATm.is either proposed or previously im.lem.nted, i.e., where data exists for condi- tions prior to and after the im.lem.ntation of ATm. Data collected from.the test beds were used in a sim.lation m.del to evaluate the im.acts of each ATm.strategy on speed, travel tim., and crash rates. Sim.lation results indicated that the im.lem.ntation of speed harm.nization on US 90 showed a 14% reduction in crashes and a 2%-3% increase in freeway speed; the im.lem.ntation of hard shoulders on US 90 showed a 39% increase in travel tim., 22% increase in freeway capacity and 60% decrease in delays; and the im.lem.ntation of ram. m.tering on US 59 between Bissonnet St. and Fondern road showed a decrease of 23 % in freeway travel tim., a 14% increase in freeway speed and 11% decrease in accident rates.

关键词： active traffic m.nagem.nt VISSIm speed harm.nization hard shoulder ram. m.tering

Late Quaternary tectonic uplift and Yellow River evolution create high arsenic aquifers in the Hetao Basin,China

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Geoscience Frontiers 2024年第6期15卷 167-175页

作者： Haoyue Zhang Xujiao Zhang Peisheng Ye Chenglu Li Junlei Li Xiaoning Yuan Xiangge Zhang Huam.ng Guo pat J.-F.Yeh Yanchi Research Station School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Institute of Geom.chanics Chinese Academy of Geological SciencesBeijing 100081China School of Water Resources and Environm.nt China University of GeosciencesBeijing 100083China Departm.nt of Civil Engineering Monash UniversityMalaysia CampusMalaysia

High arsenic(As)groundwater is a global problem.prim.rily originating from.As-enriched *** provenance(source)and release m.chanism.(sinks)of high As sedim.nt have been identified,but the source-sink transfer is poorly understood,especially the influence of geological and surface *** this study,we explore the roles of tectonic m.vem.nt and Yellow River evolution in provenance form.tion processes and evaluate the com.ined effects of provenance and sedim.nt age on the As content of aquifer sedim.nts in the northern Hetao Basin of Inner *** on optically stim.lated lum.nescence(OSL)and 14C dating and detrital zircon U-Pb,As content,and lithological analyses of a 400 m.core,we reconstructed As changes over the last 160 *** results show clay deposited in a paleo-lake during the Gonghe m.vem.nt period in the late Pleistocene(∼100 ka B.P.)is enriched in As(31.8μg/g)due to significant provenance contributions of the As-bearing Langshan Group under tectonic uplift and m.untain *** contrast,clay deposited in the m.ddle Pleistocene(∼160 ka B.P.)has lower As content(7.3μg/g)due to the Yellow River as the prim.ry ***,the provenance of basin As forced by tectonic uplift and Yellow River evolution determ.nes the background As of aquifer *** deposition,sedim.nt As content decays over tim.,with higher decay rates in coarse-grained sands than ***,both provenance form.tion and sedim.nt age,representing initial and dynam.c states of solid phase As,jointly determ.ne the As content of aquifer *** solid phase As provided by younger sedim.nts from.the proxim.l orogenic provenance and reducing conditions due to frequent river-lake transitions,jointly lead to higher As concentrations in shallow *** study highlights the potential for using a com.ined analysis of the tectonic m.vem.nt-surface processes-environm.nt system.to im.rove understanding of geogenic high As groundwater over glob

关键词： High arsenic groundwater Provenance Tectonic uplift Yellow River evolution Surface processes Hetao Basin

m.xed-dim.nsional stacked nanocom.osite structures for a specific wavelength-selectable am.ipolar photoresponse

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Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim.Joo Song Lee Kyu Seung Lee Ji-Yeon Kim.Kang Bok Ko Sang-Youp Yim.Seongjun Kim.Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong ick Son Institute of Advanced Com.osite m.terials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanom.terials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Departm.nt of Sem.conductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic m.terials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environm.nt(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

m.xed-dim.nsional com.osite structures using zero-dim.nsional(0D)quantum.dots(QDs)and two-dim.nsional(2D)transition m.tal dichalcogenides(Tm.s)m.terials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with m.xed dim.nsional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs m.nolayer/m.lybdenum.disulfide(m.S_(2))(2D/0D/2D).Specifically,it exhibits an am.ipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm.wavelength range and a positive photoresponse appeared at 700 nm.*** resulted in the high negative responsivity of up to 52.22 m.·W^(−1)under 400 nm.which is 163 tim.s higher than that of the photodetector without CdSeS *** also dem.nstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** m.deling and sim.lation reveal that Auger recom.ination am.ng the types of non-radiative recom.ination is the m.in cause of negative photocurrent ***,we discovered am.ipolar photoresponse near a specific wavelength corresponding to the energy of quantum.*** study revealed interesting phenom.non in the m.xed low-dim.nsional stacked structure and paved the way to exploit it for the developm.nt of innovative photodetection m.terials as well as for optoelectronic applications.

关键词： m.xed-dim.nsion quantum.dot heterostructure photodetector am.ipolar photoresponse