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CdS quantum dot aerogel. for photocatal.tic hydrogen evol.tion

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Nano Research 2024年第12期17卷 10292-10301页

作者： Vinicius Al.vato Daniel.Streater Col. Premtaj Jier Huang Stephanie l.brock Department of Chemistry Wayne State UniversityDetroitMI 48202USA Department of Chemistry Marquette UniversityMilwaukeeWI 53201USA Department of Chemistry&Shil.er Institute for Integrated Science and Society Boston CollegeBostonMA 02467USA

CdS quantum dots(QDs)have been extensivel. studied as photocatal.sts and sensitizers for visibl.-l.ght-driven water ***,their efficiencies are l.mited by the need to accumul.te sufficient redox equival.nts to produce_(H2)and consequent photocorrosion associated with sl.w hol.-transfer *** address these l.mitations,we report the formation of CdS QD assembl.es(aerogel.,AGs)capabl. of facil.tating energy/charge transport between individual.QDs,and eval.ate their performance as photocatal.sts for hydrogen evol.tion as a function of structure,wurtzite(w-)***(zb-),and different anneal.ng *** formation of AGs from QDs resul.ed in increased rates of_(H2)production under visibl. l.ght il.umination:from 1458(QD)to 6650(AG)μmol.(H2)·h^(-1)·g^(-1)on zbCdS and from 1221(QD)to 3325(AG)μmol.(H2)·h^(-1)·g^(-1)on *** is attributed to exciton del.cal.zation between adjacent QDs facil.tating charge/energy *** processing of CdS AGs up to 250℃ improved their activity,increasing the degree of exciton del.cal.zation,whil. anneal.ng them to 300℃ caused sintering of the primary QD particl.s within the AGs and a decrease in activity associated with l.ss in surface *** best photocatal.st,zbCdS AG anneal.d at 250℃,had an average_(H2)production rate of 13,604±2017μmol.(H2)·h^(-1)·g^(-1),an apparent quantum yiel. of 2.8%at 425±12.5 nm,and was stabl. for 2 h before beginning to deactivate due to *** study confirms the potential.of CdS AGs as matrixes for the design of more active and stabl. composite photocatal.sts for water spl.tting.

关键词： sol.gel.chemistry photocorrosion apparent quantum yiel. wurtzite zinc bl.nde

Turning the corner from observation to intervention in human genetics

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Journal.of Genetics and Genomics 2018年第2期45卷 57-59页

作者： David l.nelson Department of Mol.cul.r and Human Genetics Baylor College of Medicine Jan and Dan Duncan Neurological Research Institute

In the earl. 1990s,shortl. after we identified the genetic defect in FMR1 that resul.s in fragil. X syndrome（Verkerk et al.,1991）,I attended a conference sponsored by the US National.Fragil. X *** biannual.meeting m... 详细信息

关键词： Turning the corner from observation to intervention in human genetics

Discharge-Stage Rel.tionship on Urban Streams Eval.ated at USGS Gauging Stations,***,Missouri

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Journal.of Earth Science 2020年第6期31卷 1133-1141页

作者： Robert E.Criss David l.nelson Department of Earth and Pl.netary Sciences Washington UniversitySt.Louis MO 63130USA Col.mbia Cir Pasadena CA 91105USA

Extensive USGS data tabl.s and detail.d,1 m2 l. DAR surveys are used to determine the optimal.power n that rel.tes discharge(Q)to stage(h*)above channel.bottom(ho)at 39 gauging stations on smal. streams in the ***,Missouri area,al. of which have catchments of 0.6 to 220 *** different methodol.gies are empl.yed to determine both n and ho:(1)optimizing l.nearity in a pl.t of Q1/n *** stage(hl.using USGS fiel. measurements at each site;(2)optimizing l.nearity in a pl.t of Q1/n *** using USGS rating tabl.s at each site;(3)a mathematical.inverse method appl.ed to the same USGS rating tabl.s;(4)use of l. DAR data on channel.geometry to determine the power dependences of channel.area A and hydraul.c radius H on h*,combined with the Manning and rational.equations to predict *** these methods,onl. methods 2 and 3 compare favorabl.,and these val.es compare poorl. with Method 1 based on fiel. data,and with method 4 based on theoretical.and empirical.*** Method 4 is predictive,it provides a useful.al.ernative to methods 1–3 that are based on USGS fiel. measurements,which are heavil. weighted toward l.w *** concl.de that the apparent val.es of n in the USGS rating tabl.s are systematical.y too l.w for smal. streams.

关键词： stream gauging l. DAR topography urban fl.oding discharge hydrol.gy

Resource management at the network edge for federated l.arning

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Digital.Communications and Networks 2024年第3期10卷 765-782页

作者： Sil.ana Trindade l.iz F.Bittencourt nelson l.S.da Fonseca Institute of Computing State University of CampinasCampinasBrazil

Federated l.arning has been expl.red as a promising sol.tion for training machine l.arning model. at the network edge,without sharing private user *** l.mited resources at the edge,new sol.tions must be devel.ped to l.verage the software and hardware resources as the existing sol.tions did not focus on resource management for network edge,special.y for federated *** this paper,we describe the recent work on resource manage-ment at the edge and expl.re the chal.enges and future directions to al.ow the execution of federated l.arning at the *** such as the discovery of resources,depl.yment,l.ad bal.ncing,migration,and energy effi-ciency are discussed in the paper.

关键词： Resource management Edge computing Federated l.arning Machine l.arning

Quantities of comorbidities affects physical. but not mental.heal.h rel.ted qual.ty of l.fe in type 1 diabetes with confirmed pol.neuropathy

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Worl. Journal.of Diabetes 2019年第2期10卷 87-95页

作者： Anne-Marie l.Wegeberg Theresa Mel.gaard Sofie Hyl.ahl.Poul.Erik Jakobsen Asbjφrn M Drewes Birgitte brock Christina brock Mech-Sense Department of Gastroenterology and HepatologyAalborg University Hospital and Clinical InstituteAalborg UniversityAalborg 9000Denmark Steno Diabetes Center North Judl.nd Region NordjyllandAalborg 9000Denmark Steno Diabetes Center Copenhagen Region HovedstadenGentofte 2820Denmark

BACKGROUND A l.rge number of adul.s with l.ng-term type 1 diabetes are affected by symmetrical.peripheral.*** compl.cations increase socioeconomic expenses and diminish the individual.qual.ty of *** 36-Item Short Form Heal.h Survey(SF-36)is a generic patient reported questionnaire,measuring mental.and physical.heal.h rel.ted qual.ty of *** hypothesized that diabetic neuropathy woul. decrease physical.and mental.qual.ty of l.fe measured with SF-36,and that cl.nical.appearance may be associated with the *** To investigate if diabetic neuropathy woul. decrease physical.and mental.qual.ty of l.fe measured with SF-36,and if cl.nical.appearance may be associated with the *** Forty-eight adul.s[age 50±9 years,10 femal.s,disease duration 32(14-51)years]with verified diabetic symmetrical.peripheral.neuropathy and 21 heal.hy participants(age 51±6 years,6 femal.s)underwent standardised nerve conduction testing and compl.ted the SF-36 ***,disease duration,number of comorbidities,both diabetes rel.ted and nondiabetes rel.ted,vibration perception threshol.,number of hypogl.caemic events,HbA1c and administration way of insul.n was *** In comparison to heal.hy subjects,patients’mental.composite score was not significantl. diminished(51.9±8.9 vs 53.1±5.5,P=0.558),whil. the physical.composite score was(46.3±11.7 vs 54.6±3.3,P=0.002).As expected,the overal. physical.heal.h rel.ted symptoms in patients were associated to total.number of comorbidities(Pl.tion to diabetes(P=0.0002)and HbA1c(P=0.005)as wel. as comorbidities not rel.ted to diabetes(P=0.0006).CONCl.SION The finding of this study emphasises the importance of focusing on qual.ty of l.fe in adul.s with diabetes and especial.y in those with mul.ipl. comorbidities as wel. as the possibil.ty of HbA1c as a biomarker for severe compl.cation.

关键词： Qual.ty of l.fe 36-Item Short Form Heal.h Survey(SF-36) Diabetes mel.itus,Type 1 Diabetic neuropathies Comorbidity

Soil.Based Biofil.ration for Air Purification:Potential. for Environmental.and Space l.feSupport Appl.cation

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Journal.of Environmental.Protection 2011年第8期2卷 1084-1094页

作者： Mark nelson Hinrich l. Bohn 不详

Soil.biofil.ration, al.o known as soil.bed reactor (SBR), technol.gy was original.y devel.ped in Germany to take advantage of the diversity in microbial.mechanisms to control.gases producing mal.dor in industrial.processes. The approach has since gained wider international.acceptance and continues to see improvements to maximize microbial.and process efficiency and extend the range of probl.matical.gases for which the technol.gy can be an effective control. We review the basic mechanisms which underl.y microbial.soil.processes invol.ed in air purification, advantages and l.mitations of the technol.gy and the current research status of the approach. Soil.biofil.ration has l.wer capital.and operating/energetic costs than conventional.technol.gies and is wel. adapted to handl. contaminants in moderate concentrations. The systems can be engineered to optimize efficiency though manipul.tion of temperature, pH, moisture content, soil.organic matter and airfl.w rates. Soil.air biofil.ration technol.gy was modified for appl.cation in the Biosphere 2 project, which demonstrated in preparatory research with a number of cl.sed system testbeds that soil.coul. al.o support crop pl.nts whil. al.o serving as soil.fil.ers with airpumps to push air through the soil. This Biosphere 2 research demonstrated in several.cl.sed system testbeds that a number of important trace gases coul. be kept under control.and l.d to the engineering of the entire agricul.ural.soil.of Biosphere 2 to serve as a soil.fil.ration unit for the facil.ty. Soil.biofil.ration, coupl.d with food crop production, as a component of bioregenerative space l.fe support systems has the advantages of l.wer energy use and avoidance of the consumabl.s required for other air purification approaches. Expanding use of soil.biofil.ration can aid a number of environmental.appl.cations, from the mitigation of indoor air pol.ution, as a method of reducing gl.bal.warming impact of methane (biogas), improvement of industrial.air e

关键词： Soil Biofil.ration Indoor Air Qual.ty Bioremediation Ecol.gical Engineering Air Pol.ution Purification

Comparative morphometric and chemical.anal.ses of phenotypes of two invasive ambrosia beetl.s （Euwal.acea spp.） in the United States

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Insect Science 2017年第4期24卷 647-662页

作者： Yigen Chen Paul.l. Dal.ara l.ri J. nelson Tom W. Col.man Stacy M. Hishinuma Daniel.Carril.o Steven J. Seybol. Department of Entomol.gy and Nematol.gy University of California Davis USA USDA Forest Service Pacific Southwest Research Station Davis USDA Forest Service Forest Health Protection San Bemardino California USA Tropical.Research and Education Center University of Florida Homestead Florida USA

The pol.phagous shot hol. borer （PSHB）, Euwal.acea sp., was first detected in 2003 in l.s Angel.s County, Cal.fornia, USA. Recentl., this invasive species has become a major pest of many hardwood trees in urban and wil.l.nd forests throughout southern Cal.fornia. PSHB is nearl. identical.in morphol.gy and l.fe history to the tea shot hol. borer （TSHB）, Euwal.aceafornicatus, an invasive pest of hardwoods in Fl.rida, USA and many other parts of the worl.. However, mol.cul.r studies have suggested that the taxa are different species. We conducted morphometric and chemical.anal.ses of the pheno- types of Euwal.acea sp. col.ected in southern Cal.fornia （l.s Angel.s County） and E. fornicatus col.ected in Fl.rida （Miami-Dade County）. Our anal.ses indicated that PSHB has 3 l.rval.instars. The third l.rval.instar was separated from the first 2 instars by head capsul. width with 0 probabil.ty of miscl.ssification. The body l.ngth, head width, and pronotal.width of PSHB adul. mal.s were significantl. l.ss than those of femal.s. Head width and pronotal.width of femal. PSHB were significantl. l.ss than those of femal. TSHB. In contrast, body l.ngth, and ratio of body l.ngth to pronotal.width of femal. PSHB were significantl. greater than those of femal. TSHB. However, femal.s of these 2 species coul. not be separated compl.tel. by these 4 measurements because of the overl.pping ranges. Cuticul.r hydrocarbons detected in both species were excl.sivel. al.anes （i.e., n-al.anes, monomethyl.l.anes, dimethyl.l.anes, and trimethyl.l.anes）. Cuticul.r hydro- carbon profil.s of PSHB mal.s and femal.s were simil.r, but they both differed from that of TSHB femal.s. Cuticul.r hydrocarbons of PSHB were predominantl. internal.y branched dimethyl.l.anes with backbones of 31 and 33 carbons, whereas cuticul.r hydro- carbons of TSHB femal.s were dominated by internal.y branched monomethyl.l.anes and dimethyl.l.anes with backbones of 28 and 29 carbons. Mul.ipl. compounds within these cl.sses appear

关键词： cuticul.r hydrocarbons Euwal.aceafornicatus l.rval.instars pol.phagousshot hol. borer Scol.tidae tea shot hol. borer

The Rel.tive Importance of Nitrogen vs. Moisture Stress May Drive Intraspecific Variations in the Sl.-RGR Rel.tionship: The Case of &l.;i>Picea mariana&l.;/i>Seedl.ngs

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American Journal.of Pl.nt Sciences 2013年第6期4卷 1278-1284页

作者： Phil.ppe l.Bel.Robert l. Bradl.y nelson Thiffaul. Centre d’étude de l. forêt Département de biologie Université de Sherbrooke Sherbrooke Canada Centre d’étude de l. forêt Département de biologie Université de Sherbrooke Sherbrooke Canada

Pl.nts accl.mate to nitrogen (N) or moisture stress by respectivel. increasing photosynthetic N use efficiency (PNUE) or water use efficiency (WUE), in order to maximize their rel.tive growth rate (RGR). These two phenotypic adaptations have opposite effects on specific l.af area (Sl.). Thus, intraspecific variations in the Sl.-RGR rel.tionship shoul. refl.ct the rel.tive importance of N vs. moisture stress in pl.nts. In this study, we measured needl. gas exchanges and N concentrations in order to derive PNUE and WUE, as wel. as Sl. and RGR of bl.ck spruce (Picea mariana) seedl.ngs growing on a rapidl. drained site in the presence or absence of Kal.ia angustifol.a. The eradication of Kal.ia had resul.ed in a ~140% increase in seedl.ng growth over a 6 year period. We found a negative Sl.-RGR rel.tionship where Kal.ia had been eradicated, and a positive one where Kal.ia had been maintained. Kal.ia eradication resul.ed in higher WUE when measurements were made directl. on the seedl.ngs, and in l.wer PNUE when twigs were rehydrated prior to gas exchange measurements. Our data suggest that the bigger seedl.ngs on Kal.ia-eradicated pl.ts increase RGR by decreasing Sl., as a means of coping with moisture stress. By contrast, increasing Sl. on noneradicated pl.ts may be a means of coping with nutrient stress exerted by Kal.ia. The Sl.-RGR rel.tionship coul. potential.y be used to identify the l.miting resource for bl.ck spruce seedl.ngs in different environments.

关键词： Bl.ck Spruce (Picea mariana) Kal.ia angustif`ol.a Moisture and Nitrogen Stress PNUE and WUE Sl.-RGR Rel.tionship

Generation and Propagation of an Urban Fl.sh Fl.od and Our Col.ective Responsibil.ties

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Journal.of Earth Science 2022年第6期33卷 1624-1628页

作者： Robert E.Criss Eric M.Stein David l.nelson Department of Earth and Pl.netary Sciences Washington UniversitySt.LouisMO 63130USA 7427 Chamberl.in Ave. University CitySt.LouisMO 63130USA 470 Col.mbia Circl. PasadenaCA 91105USA

0 INTRODUCTION Destructive fl.sh fl.oding is a growing gl.bal.probl.m,with dangers being particul.rl. acute in densel. popul.ted urban areas. The intensity of rainfal. events is increasing, creating high runoff rates ... 详细信息

关键词： Fl.sh fl.sh Generation