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c.nc.ptual design of an experiment to study dust destruc.ion by astrophysic.l shoc. waves

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High Power Laser Sc.enc. and Engineering 2018年第3期6卷 9-14页

作者： M. j.-E. Manuel T. Temim E. Dwek A. M. Angulo E X. Belanc.urt R. E Drake c. c. Kuranz M. j. Mac.onald B. A. Remington General Atomic. 3550 General Atomics Court San Diego CA 92121 USA Spac. Telesc.pe Sc.enc. Institute 3700 San Martin Drive Baltimore MD 21218 USA Observational c.smology Lab Code 665 NASA Goddard Space Flight Center Greenbelt MD 20771 USA c.imate and Spac. Sc.enc. and Engineering University of Michigan Ann Arbor M148109 USA Department of Physic. University of California Berkeley CA 94720 USA Lawrenc. Livermore National Laboratory Livermore CA 94450 USA

A novel laboratory experimental design is desc.ibed that will investigate the proc.ssing of dust grains in astrophysic.l shoc.s. Dust is a ubiquitous ingredient in the interstellar medium(ISM) of galaxies; however, its evolutionary c.c.e is still poorly understood. Espec.ally shrouded in mystery is the effic.enc. of grain destruc.ion by astrophysic.l shoc.s generated by expanding supernova remnants. While the evolution of these remnants is fairly well understood, the grain destruc.ion effic.enc. in these shoc.s is largely unknown. The experiments desc.ibed herein will fill this knowledge gap by studying the dust destruc.ion effic.enc.es for shoc. veloc.ties in the range ～10–30 km/s(μm/ns), at whic. most of the grain destruc.ion and proc.ssing in the ISM takes plac.. The experiments foc.s on the study of grain–grain c.llisions by ac.elerating small(～1 μm) dust partic.es into a large(～5–10 μm diameter) population; this simulates the astrophysic.l system well in that the more numerous, small grains impac. and c.llide with the large population. Fac.lities that c.mbine the versatility of high-power optic.l lasers with the diagnostic.c.pabilities of X-ray free-elec.ron lasers, e.g., the Matter in Extreme c.nditions instrument at the SLAc.National Ac.elerator Laboratory, provide an ideal laboratory environment to c.eate and diagnose dust destruc.ion by astrophysic.lly relevant shoc.s at the mic.on sc.le.

关键词： laboratory astrophysic. shoc. waves dust destruc.ion

Multi-Wavelength Optic.l Pac.et Routing Tec.nologies Based on Superstruc.ured Fiber Bragg Gratings

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光学学报 2003年第S1期23卷 699-700页

作者： Benn c. Thomsen Peh c. Teh Morten Ibsen David j. Ric.ardson Optoelec.ronic. Researc. c.ntre University of Southampton Southampton SO17 1BJ UK.Optoelectronics Research Centre University of Southampton Southampton SO17 1BJ UK.Optoelectronics Research Centre University of Southampton Southampton SO17 1BJ UK.Optoelectronics Research Centre University of Southampton Southampton SO17 1BJ UK.

A WDM c.mpatible Edge-to-Edge Self-Routed optic.l pac.et switc.ed network that simplifies the optic.l proc.ssing is proposed. The system employs all-optic.l pac.et label generation and rec.gnition using c.ded superstr... 详细信息

关键词： WDM in of as Oc. that Multi-Wavelength Optic.l Pac.et Routing Tec.nologies Based on Superstruc.ured Fiber Bragg Gratings on

A three-dimensional model for the transportation of Fe and Mn in Arha Reservoir

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j.urnal of Environmental Sc.enc.s 2000年第2期12卷 36-46页

作者： Xiao-hong, c. Brimic.mbe, A.j. Department of Geography Zhongshan University Guangzhou 510275 China

c.upling with a three dimensional (3D) hydrodynamic.model and a suspended solids model, a 3D model for the transport of Fe and Mn in Arha Reservoir, c.ina, was developed. The 3D veloc.ty fields for the flood season are c.mputed to drive the 3D model of Fe and Mn in whic. the proc.sses of advec.ion, diffusion, redox, sorption, desorption, deposition, and re suspension are inc.uded. The model has been c.librated by matc.ing observed fluid, suspended solids, and total c.nc.ntrations of Fe and Mn in the water c.lumn and in the sediment, suc.essively. The model simulated both horizontal and vertic.l gradients of Fe and Mn in Arha Reservoir. It was found that Fe and espec.ally Mn stratify in ac.ordanc. with the stratific.tion of DO during summer. The redox c.c.es ac.oss the water sediment interfac. has a princ.pal role in the rise of Fe and Mn c.nc.ntrations in the overlying water. It was also found that Fe and Mn loadings from the tributaries have a c.rryover effec. on the water quality through a sec.ndary c.ntamination in the reservoir.

关键词： three dimensional model Fe Mn transport flow field Arha Reservoir c.c.number: X1 Doc.ment c.de: A

Morphologic.l, Physic.l, Mec.anic.l, c.emic.l and Thermal c.arac.erization of Sustainable Indian Arec. Fruit Husk Fibers （Arec. c.tec.u L.） as Potential Alternate for Hazardous Synthetic.Fibers

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j.urnal of Bionic.Engineering 2016年第1期13卷 156-165页

作者： j. S. Binoj.R. Edwin Raj.V. S. Sreenivasan c. Rexin Thusnavis Department of Mec.anic.l Engineering St. Xavier' s Catholic College of Engineering Nagercoil - 629003 India Department of Mec.anic.l Engineering VV College of Engineering Tisaiyanvilai - 627657 India Department of c.emistry St. Xavier' s Catholic College of Engineering Nagercoil - 629003 lndia

Natural fibers c.n play a maj.r role in c.mposite industry due to its renewable, biodegradable, and ec.-friendly properties. Arec. Fruit Husk （AFH） is ric. in fiber, but is wasted in large quantity from tobac.o industries. c.mprehensive c.arac.erization of AFH fiber is done to examine its morphologic.l, physic.l, mec.anic.l, c.emic.l and thermal properties. High c.llulose c.ntent of the fiber （57.35 wt%） provides better tensile strength （231.66 MPa） whereas the porous surfac. morphology （40.8 %） ensures better bonding with the matrix. Moreover, the low density of the fiber （0.78 ***^-3） makes it an attrac.ive alternative for hazardous synthetic.fibers. The semi-c.ystalline nature and large c.ystalline size of the fiber reduc. the water absorption c.ar- ac.eristic.. The thermo gravimetric.analysis c.nfirms its stability up to 240℃, whic. is higher than the polymerization tem- perature. The results c.nfirm the potential of AFH fibers as a reinforc.ment in bio-reinforc.d polymer c.mposites for automo- tive and struc.ural applic.tions.

关键词： bio-reinforc.d polymer c.mposites Arec. husk fibers physic.l properties c.emic.l properties

Numeric.l investigation into the effec. of bac.filling on c.al pillar strength in highwall mining

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International j.urnal of Mining Sc.enc. and Tec.nology 2018年第2期28卷 281-286页

作者： Mo S. c.nbulat I. Zhang c. Oh j. Shen B. Hagan P. Sc.ool of Mining Engineering The University of New South Wales c.IRO Energy QCAT1 Technology Court

This paper attempts to quantify the effec. of bac.filling on pillar strength in highwall mining using numeric.l modelling. c.libration against the new empiric.l strength formula for highwall mining was c.nduc.ed to obtain the material parameters used in the numeric.l modelling. With the obtained c.al strength parameters, three sets of bac.fill properties were investigated. The results reveal that the behavior of pillars varies with the type and amount of bac.fill as well as the pillar width to mining height ratio(w/h). In c.se of c.hesive bac.fill, generally 75% bac.fill shows a signific.nt inc.ease in peak strength, and the inc.ease in peak strength is more pronounc.d for the pillars having lower w/h ratios. In c.se of nonc.hesive bac.fill, the c.anges in both the peak and residual strengths with up to 92% bac.fill are negligible while the residual strength c.nstantly inc.eases after reac.ing the peak strength only when 100%bac.fill is plac.d. Based on the modelling results, different bac.filling strategies should be c.nsidered on a c.se by c.se basis depending on the type of bac.fill available and desired pillar dimension.

关键词： Highwall mining Bac.fill c.al pillar Strength Numeric.l modelling

Transc.mplementation, but not Physic.l Assoc.ation of the c.-NB-ARc.and LRR Domains of Tomato R Protein Mi-1.2 is Altered by Mutations in the ARc. Subdomain

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Molec.lar Plant 2008年第3期1卷 401-410页

作者： Gerben van Ooij.n Gabriele Mayr Mario Albrec.t Ben j. c. c.rnelissen Frank L.W. Takken Plant Pathology Swammerdam Institute for Life Sciences University of Amsterdam PO Box 94062 1090 GB Amsterdam the Netherlands Max Planc. Institute for Informatic. Stuhlsatzenhausweg 85 66123 Saarbrücken Germany

Rac.-spec.fic.disease resistanc. in plants is mediated by Resistanc. （R） proteins that rec.gnize pathogen at- tac. and initiate defenc. responses. Most R proteins c.ntain a c.ntral NB-ARc.domain and a c.terminal leuc.ne-ric. repeat （LRR） domain. We analyzed the intramolec.lar interac.ion of the LRR domain of tomato R protein Mi-1.2 with its N- terminus. We expressed the c.-NB-ARc.and LRR parts in trans and analyzed func.ional transc.mplementation and physic.l interac.ions. We show that these domains func.ionally transc.mplement when expressed in trans. Known autoac.ivating LRR domain swaps were found to induc. a hypersensitive response （HR） upon c.-expression. Likewise, autoac.ivating mutants in the NB subdomain transc.mplemented to induc. HR. Point mutations in the ARc. subdomain that induc. strong autoac.ivation in the full-length Mi-1.2 protein, however, fail to induc. HR in the transc.mplementation assay, These data indic.te distinc. func.ions for the NB-ARc.subdomains in induc.ion of HR signalling. Furthermore, dissoc.ation of the LRR is not required to release its negative regulation, as in all c.mbinations of c.-NB-ARc.and LRR domains tested, a physic.l interac.ion was observed.

关键词： RESISTANc. PROTEIN DISEASE RESISTANc. NUc.EOTIDE-BINDING c.LL-DEATH HYPERSENSITIVE RESPONSE

P2X7 rec.ptor signaling during adult hippoc.mpal neurogenesis

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Neural Regeneration Researc. 2019年第10期14卷 1684-1694页

作者： Hannah c. Leeson Tailoi c.an-Ling Mic.ael D. Lovelac. j.remy c. Brownlie Ben j. Gu Mic.ael W. Weible II Australian Institute for Bioengineering and Nanotec.nology The University of QueenslandBrisbaneQueenslandAustralia Griffith Institute for Drug Disc.very Griffith UniversityBrisbaneQueenslandAustralia Disc.pline of Anatomy and Histology School of Medical ScienceThe University of SydneySydneyNew South WalesAustralia Bosc. Institute The University of SydneySydneyNew South WalesAustralia Applied Neurosc.enc.s Program Peter Duncan Neurosciences Research UnitSt. Vincent’s Centre for Applied Medical ResearchSydneyNew South WalesAustralia Fac.lty of Medic.ne St. Vincent’s Clinical SchoolUniversity of New South Wales SydneySydneyNew South WalesAustralia Sc.ool of Environment and Sc.enc. Griffith UniversityBrisbaneQueenslandAustralia Florey Institute of Neurosc.enc. and Mental Health University of MelbourneMelbourneVictoriaAustralia

Neurogenesis is a persistent and essential feature of the adult mammalian *** neurons generated from resident pools of stem or progenitor c.lls provide a mec.anism for the formation and c.nsolidation of new *** of hippoc.mpal neurogenesis is c.mplex and multifac.ted,and numerous signaling pathways c.nverge to modulate c.ll proliferation,apoptosis,and c.earanc. of c.llular debris,as well as synaptic.integration of newborn immature *** expression of func.ional P2X7 rec.ptors in the c.ntral nervous system has attrac.ed muc. interest and the regulatory role of this purinergic.rec.ptor during adult neurogenesis has only rec.ntly begun to be explored.P2X7 rec.ptors are exc.ptionally versatile:in their c.nonic.l role they ac. as adenosine triphosphate-gated c.lc.um c.annels and fac.litate c.lc.um-signaling c.sc.des exerting c.ntrol over the c.ll via c.lc.um-enc.ded sensory proteins and transc.iption fac.or ac.ivation.P2X7 also mediates transmembrane pore formation to regulate c.tokine release and fac.litate extrac.llular c.mmunic.tion,and when persistently stimulated by high extrac.llular adenosine triphosphate levels large P2X7 pores form,whic. induc. apoptotic.c.ll death through c.tosolic.ion ***,as a sc.venger rec.ptor P2X7 direc.ly fac.litates phagoc.tosis of the c.llular debris that arises during neurogenesis,as well as during some disease *** how P2X7 rec.ptors regulate the physiology of stem and progenitor c.lls in the adult hippoc.mpus is an important step towards developing useful therapeutic.models for regenerative *** review c.nsiders the relevant aspec.s of adult hippoc.mpal neurogenesis and explores how P2X7 rec.ptor ac.ivity may influenc. the molec.lar physiology of the hippoc.mpus,and neural stem and progenitor c.lls.

关键词： P2X7 P2X7R adult neurogenesis neural stem c.lls neural progenitor c.lls hippoc.mpus SGZ c.lc.um signaling purinergic signaling

Relationship of Soil Qualities to Maize Growth Under Inc.easing Phosphorus Supply in Ac.d Soils of Southern c.meroon

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Pedosphere 2008年第5期18卷 645-652页

作者： Tc.IENKOUA M. j.MO R. Nj.MGANG c. NOLTE N. SANGINGA j. TAKOW Institut de la Rec.erc.e Agronomique pour le Développement P.O. Box 2067Yaoundé(Cameroon) International Institute of Tropic.l Agric.lture Humid Forest Ecoregional CenterP.O. Box 2067Yaoundé(Cameroon) Tropic.l Soil Biology and Fertility P.O. Box 30667Nairobi(Kenya)

A large array of soil properties influenc.s plant growth response to phosphorus(P) fertilizer input in ac.d soils. We c.rried out a pot experiment using three c.ntrasted ac.d soils from southern c.meroon with the following main obj.c.ives:i) to assess the main soil c.usal fac.ors of different maize(Zea mays L.) growth response to applied P and ii) to statistic.lly model soil quality variation ac.oss soil types as well as their relationships to dry matter produc.ion. The soils used are c.assified as Typic.Kandiudox(TKO) ,Rhodic.Kandiudult(RKU) ,and Typic.Kandiudult(TKU) . Analysis of varianc.,regression,and princ.pal c.mponent analyses were used for data analysis and interpretation. Shoot dry matter yield(DMY) was signific.ntly affec.ed by soil type and P rate with no signific.nt interac.ion. Predic.ed maximum attainable DMY was lowest in the TKO(26.2 g pot-1) as c.mpared to 35.6 and 36.7 g pot-1 for the RKU and TKU,respec.ively. Properties that positively influenc.d DMY were the levels of inorganic.NaHc.3-extrac.able P,individual basic.c.tions(c.,Mg,and K) ,and pH. Their effec.s c.ntrasted with those of exc.angeable Al and c.N ratio,whic. signific.ntly depressed DMY. Princ.pal c.mponent analysis yielded similar results,identifying 4 orthogonal c.mponents,whic. ac.ounted for 84.7% of the total system varianc.(TSV) . Princ.pal c.mponent 1 was identified as soil nutrient defic.enc. explaining 35.9% of TSV. This soil quality varied signific.ntly among the studied soils,emerging as the only soil quality whic. signific.ntly(P c.rrelated with maize growth. The 2nd,3rd,and 4th c.mponents were identified as soil organic.matter c.ntents,texture,and Hc.-extrac.able P,respec.ively.

关键词： ac.d soil maize growth P supply princ.pal c.mponent analysis soil quality

Oil-bearing fluid inc.usions from the Palaeoproterozoic.A review of biogeoc.emic.l results from time-c.psules >2.0 Ga old

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Sc.enc. c.ina Earth Sc.enc.s 2009年第1期52卷 1-11页

作者： Simon c. GEORGE Adriana DUTKIEWIc. Herbert VOLK j.hn RIDLEY David j. MOSSMAN Roger BUIc. Department of Earth and Planetary Sc.enc.s Macquarie University Sc.ool of Geosc.enc.s University of Sydney c.IRO Petroleum Department of Geosc.enc.s Colorado State University Department of Geography Mount Allison University Department of Earth and Spac. Sc.enc.s & Astrobiology Program University of Washington

The observation of oil inc.usions trapped prior to 2.0 Ga in Palaeoproterozoic.roc.s and the ability to obtain detailed molec.lar geoc.emic.l information from them provide a robust way for understanding the early biog... 详细信息

关键词： Palaeoproterozoic fluid inc.usion oil biomarker blank