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The Use of.Secondary Grape Biomass in Beef.cattle nutrition on.c.rcass characteristics, Quality and Shelf.Lif. of.meat

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f.od and nutrition Sciences 2024年第6期15卷 447-469页

作者： Vitor L. molosse Guilherme L. Deolindo Raf.el V. P. Lago Bruna Klein.c.aiton A. Zotti marcelo Vedovato marcylene V. da Silveira Priscila m. copetti maria R. c. Schetinger Juscivete f. f.vero eliana L. f.orentin Aleksandro S. da Silva Universidade do estado de Santa catarina (UDeSc) Chapec Brazil Department of.Animal Science UDESC Chapec Brazil Department of.Animal Science Universidade do Oeste de Santa Catarina Xanxere Brazil Dean Lee Research and extension.c.nter Louisiana State University Alexandria LA USA Department of.Biochemistry Universidade Federal de Santa Maria Santa Maria Brazil Department of.medicina Veterinria UNOCHAPEC Chapec Brasil

We determined whether the inclusion of.100 g/kg dry matter of.grape pomace silage (GPS) and grape pomace bran (GPB) as substitutes f.r other traditional f.ber sources in the diet of.steers (charolais x nellore) would improve carcass characteristics, meat quality and composition, and shelf.lif.. Twenty-f.ur animals (248 ± 19.32 kg of.initial body weight) were f.d a high concentrate diet f.r 121 days. carcass characteristics were measured, and the longissimus dorsi muscle was analyzed f.r f.tty acid (f.) prof.le and composition. The meat was sliced and stored in air-permeable packages f.r 10 days. On each sampling day (d 1, 3, 7, and 10), oxidative stability, bacterial load, lipid and protein oxidation, and staining were analyzed. The experimental diets inf.uenced the pH of.cold carcasses only. The GPS group had a higher pH than the control. The GPS and GPB groups showed improved oxidant status (i.e., lower lipid peroxidation and concentrations of.reactive oxygen species were in the meat of.both groups than in.c.ntrol). On the f.rst day of.storage, the antioxidant enzyme glutathione S-transf.rase activity was more signif.cant in the meat of.the GPS and GPB groups than in the control. The bacterial loads in the meat were attenuated by GPS inclusion;there were lower total colif.rm counts and a trend toward lower counts f.r enterobacteria in the control group. The diets altered the f. prof.le of.the meat;i.e., the GPB diet allowed f.r a more signif.cant amount of.the n-6 omegas in the meat, while the GPS diet showed a tendency f.r a more signif.cant amount of.n-6 and 9 omegas. Both diets (GPS and GPB) increased the amounts of.long-chain f.s. The GPS diet decreased saturated f. levels. We conclude that the dietary treatments GPS and GPB are a promising alternative to maintain meat quality standards throughout in real-world retail conditions. These treatments gave rise to an improvement in the nutritional value of.the meat due to the more signif.cant amounts of.f.s that im

关键词： Animal nutrition Antioxidant Biomass Grape meat Quality microbiology Residue

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Design of.multilayer hybrid sol-gel coatings with bif.nctional barrier-bioactive response on the elektron 21 magnesium alloy f.r biomedical applications

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Journal of.magnesium and Alloys 2021年第6期9卷 2097-2112页

作者： K.S.Durán n.Hernández L.m.Rueda c.A.Hernández-Barrios A.e.coy f.Viejo Grupo de Investigación en Desarrollo y Tecnología de nuevos materiales(GImAT) Universidad Industrial de Santander9 Cra.27Colombia Grupo de Investigación de las ciencias de las Ingenierías(GIcI) Universidad de San BuenaventuraCartagenaCalle Real de TerneraDiagonal 32#30-966Colombia

The present study aims to develop multilayer barrier-bioactive hybrid sol-gel coatings f.om a mixture of.the silane precursors tetraethylorthosilicate(TeOS)and glycidoxypropyltriethoxysilane(GPTmS)deposited on the elektron 21 magnesium *** purpose of.the inner layer(barrier coating)was to provide corrosion protection to the magnesium alloy,whereas the outer layer(bioactive coating)was doped with dif.erent ca and mg contents to produce a bioactive *** coatings were characterised using scanning electron microscopy(Sem)and their corrosion behaviour was evaluated by anodic polarisation and electrochemical im.e.ance spectroscopy af.er im.e.sion in simulated body f.uid(SBf.at 37±0.5°*** experimental results showed that the multilayer coatings increased the corrosion resistance of.the alloy up to three orders of.magnitude during im.e.sion in SBf.*** the other hand,the presence of.ca and mg in the bioactive coating promoted the growth of.apatite-like ***,an increment of.salt content f.voured the f.rmation of.porous coatings,which allowed the access of.the electrolyte to the substrate leading to their rapid *** the latter,this research endorses the premise that the TeOS-GPTmS hybrid system represents a promising alternative to produce bif.nctional barrier-bioactive coatings.

关键词： magnesium bioactivity coating sol-gel eIS corrosion

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Regularized quantile regression f.r SnP marker estimation of.pig growth curves

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Journal of.Animal Science and Biotechnology 2017年第4期8卷 824-832页

作者： L.m.A.Barroso m.nascimento A.c.c.nascimento1 f.f.Silva n.V.L.Serao c.D.cruz m.D.V.Resende f.L.Silva c.f.Azevedo P.S.Lopes S.e.f.Guimaraes Department of.Statistics Federal University of Vicosa Av. P H Rolfs s/nUniversity Campus Vicosa MG 36570-000 Brazil Department of.Animal Science Federal University of Vicosa Av. P H Rolfs s/n University CampusVicosa MG 36570-000 Brazil Department of.Animal Science Iowa State University Kildee Hall 50011 Ames Iowa USA Department of.General Biology Federal University of Vicosa Av. P H Rolfs s/n University CampusVicosa MG 36570-000 Brazil embrapa f.restry Estrada da Ribeira km 111Colombo PR Brazil. Department of.Plant Science Federal University of Vicosa Av. P H Rolfs s/n University Campus Vicosa MG 36570-000 Brazil

Background: Genomic growth curves are general y def.ned only in terms of.population mean; an alternative approach that has not yet been exploited in genomic analyses of.growth curves is the Quantile Regression(QR). This methodology allows f.r the estimation of.marker ef.ects at dif.erent levels of.the variable of.interest. We aimed to propose and evaluate a regularized quantile regression f.r SnP marker ef.ect estimation of.pig growth curves, as well as to identif. the chromosome regions of.the most relevant markers and to estimate the genetic individual weight trajectory over time(genomic growth curve) under dif.erent quantiles(levels).Results: The regularized quantile regression(RQR) enabled the discovery, at dif.erent levels of.interest(quantiles), of.the most relevant markers al owing f.r the identif.cation of.QTL regions. We f.und the same relevant markers simultaneously af.ecting dif.erent growth curve parameters(mature weight and maturity rate): two(ALGA0096701 and ALGA0029483)f.r RQR(0.2), one(ALGA0096701) f.r RQR(0.5), and one(ALGA0003761) f.r RQR(0.8). Three average genomic growth curves were obtained and the behavior was explained by the curve in quantile 0.2, which dif.ered f.om the ***: RQR allowed f.r the construction of.genomic growth curves, which is the key to identif.ing and selecting the most desirable animals f.r breeding purposes. f.rthermore, the proposed model enabled us to f.nd, at dif.erent levels of.interest(quantiles), the most relevant markers f.r each trait(growth curve parameter estimates) and their respective chromosomal positions(identif.cation of.new QTL regions f.r growth curves in pigs). These markers can be exploited under the context of.marker assisted selection while aiming to change the shape of.pig growth curves.

关键词： Genome association Growth curve Pig QTL Regularized quantile regression

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Geochemistry and petrogenetic evolution of.metasedimentary rocks in Bunu Area,part of.Kabba-Lokoja-Igarra schist belt,SW nigeria

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Acta Geochimica 2022年第5期41卷 765-788页

作者： m.S.Kolawole e.c.chukwu A.n.Agibe Department of.Geology Federal UniversityOye-EkitiEkiti StateNigeria

f.eld and geochemical studies of.the Bunu area,SW nigeria,were carried out on gneiss-metasedimentary rocks that consist of.migmatised gneiss,quartz-mica schist,and f.liated and massive *** gneissmetasedimentary rocks are interbedded with meta-igneous rock(amphibolite),all of.which are intruded by granitoid and cut by basic and f.lsic *** data on major,trace,and rare earth elements of.these rocks f.om the area were used to speculate on the petrogenetic and geodynamic evolution of.the rocks in the ***,the metasedimentary rocks in the area have a restricted range of.major oxides such as SiO_(2)and Al_(2)O_(3)with low average values of.f.O,mnO,caO,and *** of.average values of.HSf. such as Zr,nb,and Y are moderately high in migmatitic gneiss,quartzmica schist,and low in both massive and f.liated quartzite.ΣLRee average values are 124.25,132.41,and18.64 ppm respectively f.r migmatite gneiss,quartz-mica schist,and low in both massive and f.liated *** rocks are also generally enriched in Ba,cs,Pb,U,cr,Rb,and Zr and depleted in Be,Sr,Ti,mo,Th,and *** enrichment–depletion in major oxides and trace elements of.the rocks in this area is probably a consequence of.the movement of.metamorphic remobilized f.uids within the rocks in the area during the Pan-Af.ican or earlier events as noted in the adjacent egbe-Isanlu Schist belt.A f.rther geochemical characterisation of.the rocks in the area using Log(na_(2)O/KO)vs Log(SiO_(2)/Al_(2)O_(3)indicates that while the protolith of.migmatised gneiss and quartzmica schist are greywackes to litharenite in.c.mpositions that of.quartzites are sublitharenite to quartz *** the ternary plot of.Al_(2)O_(3)-(caO+na_(2)O)-KO f.r metasedimentary rocks in the area,most migmatitic gneiss and quartz-mica schist rocks plot close to average shale while quartzites mostly tend to illite compositions and almost toward the Al_(2)O_(3)-apex of.the diagram attesting to depletion of

关键词： Geochemical studies metasedimentary rocks Geodynamic activities Protolith Passive continental margins

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evidence f.r particle acceleration approaching PeV energies in the W51 complex

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Science Bulletin 2024年第18期69卷 2833-2841页

作者： LHAASO collaboration Zhen.c.o f.Aharonian Axikegu Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi W.Bian A.V.Bukevich Q.cao W.Y.cao Zhe cao J.chang J.f.chang A.m.chen e.S.chen H.X.chen Liang chen Lin.c.en Long chen m.J.chen m.L.chen Q.H.chen S.chen S.H.chen S.Z.chen T.L.chen Y.chen n.c.eng Y.D.cheng m.Y.cui S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan J.H.f.n Y.Z.f.n J.f.ng J.H.f.ng K.f.ng c.f.f.ng H.f.ng L.f.ng S.H.f.ng X.T.f.ng Y.f.ng Y.L.f.ng S.Gabici B.Gao c.D.Gao Q.Gao W.Gao W.K.Gao m.m.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou m.H.Gu f.L.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han m.Hasan H.H.He H.n.He J.Y.He Y.He Y.K.Hor B.W.Hou c.Hou X.Hou H.B.Hu Q.Hu S.c.Hu D.H.Huang T.Q.Huang W.J.Huang X.T.Huang X.Y.Huang Y.Huang X.L.Ji H.Y.Jia K.Jia K.Jiang X.W.Jiang Z.J.Jiang m.Jin m.m.Kang I.Karpikov D.Kuleshov K.Kurinov B.B.Li c.m.Li cheng Li cong Li D.Li f.Li H.B.Li H.c.Li Jian Li Jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li Y.Z.Li Zhe Li Zhuo Li e.W.Liang Y.f.Liang S.J.Lin B.Liu c.Liu D.Liu D.B.Liu H.Liu H.D.Liu J.Liu J.L.Liu m.Y.Liu R.Y.Liu S.m.Liu W.Liu Y.Liu Y.n.Liu Q.Luo Y.Luo H.K.Lv B.Q.ma L.L.ma X.H.ma J.R.mao Z.min W.mitthumsiri H.J.mu Y.c.nan A.neronov L.J.Ou P.Pattarakijwan.c. Z.Y.Pei J.c.Qi m.Y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruf.olo A.Sáiz m.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng f.W.Shu H.c.Song Yu.V.Stenkin V.Stepanov Y.Su D.X.Sun Q.n.Sun X.n.Sun Z.B.Sun J.Takata P.H.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian.c.Wang c.B.Wang G.W.Wang H.G.Wang H.H.Wang J.c.Wang Kai Wang Kai Wang L.P.Wang L.Y.Wang P.H.Wang R.Wang W.Wang X.G.Wang X.Y.Wang Y.Wang Y.D.Wang Y.J.Wang Z.H.Wang Z.X.Wang Zhen Wang Zheng Wang D.m.Wei J.J.Wei Y.J.Wei T.Wen.c.Y.Wu H.R.Wu Q.W.Wu S.Wu X.f.Wu Y.S.Wu S.Q.Xi J.Xia G.m.Xiang D.X.Xiao G.Xiao Y.L.Xin Y.Xing D.R.Xiong Z.Xiong D.L.Xu R.f.Xu R.X.Xu W.L.Xu L.Xue D.H.Yan J.Z.Yan T.Yan.c.W.Yang c.Y.Yang f.Yang f.f.Yang L.L.Yang m.J.Yang R.Z.Yang W.X.Yang Y.H.Yao Z.G.Yao L.Q.Yin n.Yin X.H.You Z.Y.You Y.H.Yu Q.Yuan H.Yue H.D.Zeng T.X.Zeng W.Zeng m.Zha B.B.Zhang f.Zhang H.Zhang 不详 Key Laboratory of.Particle Astrophysics&experimental Physics Division.c.mputing center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of.chinese Academy of.Sciences Beijing 100049China TIAnf. cosmic Ray Research center ChengduChina Dublin Institute f.r Advanced Studies 31 Fitzwilliam Place2 DublinIreland max-Planck-Institut f.r n.c.ear Physics P.O.Box 103980Heidelberg 69029Germany School of.Physical Science and Technology&School of.Inf.rmation Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of.Astronomy and Space Science Nanjing UniversityNanjing 210023China center f.r Astrophysics Guangzhou UniversityGuangzhou 510006China Tsung-Dao Lee Institute&School of.Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute f.r n.c.ear Research of.Russian Academy of.Sciences Moscow 117312Russia Hebei normal University Shijiazhuang 050024China University of.Science and Technology of.china Hefei 230026China State Key Laboratory of.Particle Detection and electron.c. China Key Laboratory of.Dark matter and Space Astronomy&Key Laboratory of.Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Research center f.r Astronomical computing Zhejiang LaboratoryHangzhou 311121China Key Laboratory f.r Research in Galaxies and cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China School of.Physics and Astronomy Yunnan UniversityKunming 650091China Key Laboratory of.cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of.Physics and Astronomy(Zhuhai)&School of.Physics(Guangzhou)&Sino-f.ench Institute of.n.c.ear engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275GuangdongChina Institute of.f.ontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APc UniversitéParis Cité

Theγ-ray emission f.om the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays(cRs)accelerated by the shock of.supernova remnant(SnR)W51c and the dense molecular clouds in the adjacent star-f.rming region,***,the maximum acceleration.c.pability of.W51c f.r cRs remains *** on observations conducted with the Large High Altitude Air Shower Observatory(LHAASO),we report a signif.cant detection of.rays emanating f.om the W51 complex,with energies f.om 2 to 200 *** LHAASO measurements,f.r the f.rst time,extend theγ-ray emission f.om the W51 complex beyond 100 TeV and reveal a signif.cant spectrum bending at tens of.*** combining the"π^(0)-decay bump"f.atured data f.om f.rmi-LAT,the broadbandγ-ray spectrum of.the W51 region.c.n be well-characterized by a simple pp-collision *** observed spectral bending f.ature suggests an exponential cutof. at~400 TeV or a power-law break at~200 TeV in the cR proton spectrum,most likely providing the f.rst evidence of.SnRs serving as cR accelerators approaching the PeV ***,two young star clusters within W51B could also be theoretically viable to produce the most energeticγrays observed by *** f.ndings strongly support the presence of.extreme cR accelerators within the W51 complex and provide new insights into the origin of.Galactic cRs.

关键词： UHe c-ray cosmic rays SnR W51c Star clusters

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Annotated expressed sequence tags and xenobiotic detoxif.cation in the aphid myzus persicae （Sulzer）

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Insect Science 2007年第1期14卷 29-45页

作者： c.c. f.GUeROA n. PRUnIeR-LeTeRme c. RISPe f. SePOLVeDA e. f.enTeS-cOnTReRAS B. SABATeR-mUnOZ J.-c. SImOn D. TAGU Instituto de ecologia y evolucion Facultad de Ciencias Universidad Austral de Chile Valdivia Chile InRA Rennes UMR 1099 BiO3P INRA - Agrocampus BP 35327 35653 Le Rheucedex France and Departamento de Produccion Agrf.ola Facultad de Ciencias Agrarias Universidad de Talca Talca Chile

Aphids （Hemiptera： Aphididae） are phytophagous insects that are important agricultural pests. The enormous negative economic impacts caused by aphids worldwide are well known, and are mostly due to their high multiplication rate and the transmission of.phytopathogen.c.viruses. Aphid management strategies mainly involve chemical treatments which are pollutants and are increasingly inef.icient, since aphids have developed multiple insecticide-resistant mechanisms. Among the most economically important species is the green peach aptf.d myzus persicae Sulzer （Aphididae： macrosiphini）, which is able to colonize a wide range of.host plants belonging to many dif.erent f.milies, and transmits numerous plant viruses. Because of.its large prevalence, m. persicae has been the target of.massive insecticide treatments; consequently, it has evolved several insecticide-resistant mechanisms. In this work, a collection of.expressed genes f.om m. persicae is presented in order to identif. putative genes involved in xenobiotic detoxif.cation. Af.er cDnA cloning and sequencing, 959 expressed sequence tags （eST） were annotated. most sequences matched known genes corresponded to metabolism proteins （26%）, ribosomal proteins （ 23 % ） and structural proteins （8%）. Among them, several sequences corresponded to proteins putatively involved in sensing, degradation or detoxif.cation of.plant xenobiotic products.

关键词： aphid detoxif.cation eST genomics insect-plant relationships myzuspersicae

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Inversion of.electrical mobility measurements using bipolar or unipolar chargers f.r the arbitrary distribution of.channels

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Particuology 2015年第3期13卷 114-123页

作者： m.Domat f.e.Kruis n.L.Azong-Wara J.m.f.rnandez-Diaz Department of.Physics University of OviedoC/Calvo Sotelos/nE-33007 OviedoSpain Institute of.Technology f.r nanostructures(nST) and center f.r nanointegration Duisburg-essen.c.nIDe) University of Duisburg-EssenBismarckstr.81D-47057 DuisburgGermany

The inversion of.the particle size distribution f.om.e.ectrical mobility measurements is analyzed. Three dif.erent methods are adapted f.r a dot-matrix approach to the problem, especially f.r non-square or singular matrices, and applied to electrical mobility measurements f.om f.xed or scanning voltages. mul- tiply charged particles, dif.usion losses, arbitrary voltage steps and noise were considered, which results in non-adjoining and overlapping transf.r f.nctions. The individual contribution of.the transf.r f.nc- tions in each size interval was geometrically estimated, which requires only its characteristic mobilities. The methodology is applied to mobility measurements f.om particles charged with unipolar and bipolar chargers. However, the method can be extrapolated to any charging method with a def.ned charge distribution, and retrieval of.the singly charged particle distribution and mean.c.arge f.om a tandem dif.erential mobility analysis conf.guration was successf.lly demonstrated.

关键词： Tandem dif.erential mobility analysisInverse problem.e.ularization methodsSize distributionTransf.r f.nctionUnipolar charger

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Photocatalytic perf.rmance of.K2Ti6O13 whiskers to H2 evolution and cO2 photo-reduction

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Journal of.energy chemistry 2019年第10期28卷 18-28页

作者： L. f. Garay-Rodríguez L.m.Torres-martínez e.moctezuma f.cultad de Ingeniería civil-Departamento de ecomateriales y energía Universidad Autónoma de Nuevo LeónAv. Universidad S/N Cd. UniversitariaC. P. 66455 San Nicolás de los GarzaNLMéxico f.cultad de ciencias Químicas Universidad Autónoma de San Luis PotosíAv. Manuel Nava#6C. P.78290 San Luis PotosíSLPMéxico

K2Ti6O13 whiskers were synthesized by conventional sol-gel method, sono-chemical assisted and microwave assisted sol-gel method in order to obtain.c.talysts with dif.erent particle sizes and to modif. their optical, textural and electrochemical properties. These modif.cations improved their photocatalytic activity f.r H2 evolution and cO2 photo-reduction. Long K2Ti6O13 whiskers prepared by ultrasound assisted sol-gel method are the most active photocatalysts f.r the hydrogen evolution reaction using pure water as reactant (U-SG, 10,065 μmol g^-1). In.c.ntrast, an opposite behavior was observed using a mixture of.ethanol-water, where the highest activity was achieved by the shortest and less crystalline K2Ti6O13 whiskers (c-SG, 3,2871 μmol g^-1). In.c.se of.cO2 photo-reduction, long whiskers that were also prepared by the sono-chemical assisted sol-gel method were the most active to transf.rm cO2 to f.rmaldehyde, methane, methanol and hydrogen. The ef. value of.this catalyst is located very close to the potential f.r f.rmaldehyde production and f.vors the selectivity to this organ.c.product.

关键词： K2Ti6O13 Sol-gel Whiskers Hydrogen evolution cO2 reduction

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由超拍电子伏特加速器产生的超高能伽马射线气泡

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Science Bulletin 2024年第4期69卷 449-457页

作者： LHAASO collaboration Zhen.c.o chuandong Gao cong Li Ruo-Yu Liu Ruizhi Yang 不详 Key Laboratory of.Particle Astrophyics&experimental Physics Division.c.mputing center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of.chinese Academy of.Sciences Beijing 100049China TIAnf. cosmic Ray Research center ChengduChina Institute of.f.ontier and Interdisciplinary Science Shandong UniversityQingdao 266237China School of.Astronomy and Space Science Nanjing UniversityNanjing 210023China University of.Science and Technology of.china Hefei 230026China

We report the detection of.aγ-ray bubble spanning at least 100deg2 in ultra-high energy(UHe)up to a f.w PeV in the direction of.the star-f.rming region.c.gnus X,implying the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola f.rm with the photon indexΓ(e)=(2.71±0.02)+(0.11±0.02)×log10(e/10 TeV)is f.und f.tting the gamma-ray energy spectrum of.the bubble *** sources,“hot spots”correlated with very massive molecular clouds,and a quasi-spherical amorphousγ-ray emitter with a sharp central brightening are observed in the *** the core of.0.5°,spatially associating with a region.c.ntaining massive OB association.c.gnus OB2)and a microquasar(cygnus X-3),as well as previously reported multi-TeV sources,an enhanced concentration of.UHeγ-rays is observed with 2 photons at energies above 1 *** general f.ature of.the bubble,the morphology,and the energy spectrum,are reasonably reproduced by the assumption of.a particle accelerator in the core,continuously injecting protons into the ambient medium.

关键词： cosmic rays γ-rays Interstellar medium Star cluster

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OH and O radicals production in atmospheric pressure air/Ar/H_2O gliding arc discharge plasma jet

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Plasma Science and Technology 2017年第12期19卷 71-80页

作者： n.c.ROY m R TALUKDeR A n.c.OWDHURY Plasma Science and Technology Laboratory Department of Applied Physics and Electronic EngineeringUniversity of RajshahiRajshahi 6205Bangladesh Bangladesh council of.Scientif.c and Industrial Research Laboratory Rajshahi Rajshahi 6206Bangladesh

Atmospheric pressure air/Ar/H_2O gliding arc discharge plasma is produced by a pulsed dc power supply. An optical emission spectroscopic（OeS） diagnostic technique is used f.r the characterization of.plasmas and f.r identif.cations of.OH and O radicals along with other species in the plasmas. The OeS diagnostic technique reveals the excitation Tx？≈？5550–9000 K, rotational Tr？≈？1350–2700 K and gas Tg？≈？850–1600 K tem.e.atures, and electron density n？（1.1-1.9） ′101 4 cm^（-3） e under dif.erent experimental conditions. The production and destruction of.OH and O radicals are investigated as f.nctions of.applied voltage and air f.ow rate. Relative intensities of.OH and O radicals indicate that their production rates are increased with increasing Ar content in the gas mixture and applied voltage. nereveals that the higher densities of.OH and O radicals are produced in the discharge due to more ef.ective electron impact dissociation of.H_2O and O_2 molecules caused by higher kinetic energies as gained by electrons f.om the enhanced electric f.eld as well as by enhanced n *** productions of.OH and O are decreasing with increasing air f.ow rate due to removal of.Joule heat f.om the discharge region but enhanced air f.ow rate signif.cantly modif.es discharge maintenance properties. Besides, Tgsignif.cantly reduces with the enhanced air f.ow rate. This investigation reveals that Ar plays a signif.cant role in the production of.OH and O radicals.

关键词： reactive oxygen species(ROS) optical emission spectroscopy(OeS) gliding arc discharge plasma kinetics broadening mechanism

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