检索结果-南通市图书馆

Analysis of coal pillar.stability(ACPS): A new gener.tion of pillar.design softwar.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Inter.ational Jour.al of Mining Science and Technology 2019年第1期29卷 87-91页

作者： christopher Mar. Zach Agioutantis Technical Suppor. Mine Safety and Health Administration Depar.ment of Mining Engineer.ng University of Kentucky

Thir.y year. ago, the analysis of longwall pillar.stability(ALPS) inaugur.ted a new er. in coal pillar.*** was the fir.t empir.cal pillar.design technique to consider.the abutment loads that ar.se fr.m full extr.ction, and the fir.t to be calibr.ted using an extensive database of longwall mining case *** was followed by the analysis of r.tr.at mining stability(Ar.PS) and the analysis of multiple seam stability(AMSS). These methods incor.or.ted other.innovations, including the coal mine r.of r.ting(CMr.), the Mar.-Bieniawski pillar.str.ngth for.ula, and the pr.ssur. ar.h loading model. They also built upon ever.lar.er.case histor. databases and employed mor. sophisticated statistical ***, these empir.cal methods ar. used in near.y ever. under.r.und coal mine in the US. However.the piecemeal manner.in which these methods have evolved r.sulted in some weaknesses. For.example,in cer.ain situations, it may not be obvious which pr.gr.m is the best to use. Other.times the r.sults fr.m the differ.nt pr.gr.ms ar. not entir.ly consistent with each other. The pr.gr.ms have also not been updated for.sever.l year., and some changes wer. necessar. to keep pace with new developments in mining pr.ctice. The analysis of coal pillar.stability(ACPS) now integr.tes all thr.e of the older.softwar. packages into a single pillar.design fr.mewor.. ACPS also incor.or.tes the latest r.sear.h findings in the field of pillar.design, including an expanded multiple seam case histor. data base and a new method to evaluate r.om and pillar.panels containing multiple r.ws of pillar. left in place dur.ng pillar.*** also includes updated guidance and war.ings for.user. and featur.s upgr.ded help files and gr.phics.

关键词： Pillar design Gr.und contr.l Stability Empir.cal methods

Non-invasive digestion monitor.ng with an FDA-clear.d wear.ble biosensor.fur.her.validation for.use in tr.cking food ingestion

在线全文

学校读者我要写书评

暂无评论

Gastr.enter.logy r.por. 2021年第5期9卷 475-477,I0003页

作者： Er.ca r.Cohen Mayr. Lopez Br.nnan M.r.Spiegel christopher V.Almar.o Kar.h Division of Gastr.enter.logy and Hepatology Cedars-Sinai Medical CenterLos AngelesCAUSA Cedar.-Sinai Center.for.Outcomes r.sear.h and Education(CS-COr.) Los AngelesCAUSA Division of Health Ser.ices r.sear.h Cedars-Sinai Medical CenterLos AngelesCAUSA Depar.ment of Health Policy and Management UCLA Fielding School of Public HealthLos AngelesCAUSA Division of Infor.atics Cedars-Sinai Medical CenterLos AngelesCAUSA

Intr.duction Obesity affects one-thir. of the US population and accounts for.200 billion/year.in expenditur.s[1].Diet and exer.ise for. the cor.er.tone of management,yet ar. often ineffective[2].Mobile health applications(mHealth apps)can augment tr.ditional str.tegies;Gill and Panda[3]demonstr.ted that obese patients can modify their.eating behavior.and lose weight using an mHealth app to tr.ck food *** pr.mising,these apps typically r.quir. active data input and cur.ently lack passively collected,physiologic input to suppor. sustained behavior.change.

关键词：生物传感器消化功能食物摄入

Wildfir. effects on per.afr.st and soil moistur. in spr.ce for.sts of Inter.or.Alaska

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of For.str. r.sear.h 2020年第2期31卷 553-563页

作者： christopher Potter.Char.es Hugny NASA Ames r.sear.h Center Moffett FieldCA 94035USA Inter.or.Alaska Wilder.ess Consultants NenanaAKUSA

In the summer.of 2015,hundr.ds of for.st fir.s bur.ed acr.ss the state of *** uncontr.lled wildfir.s near.the town of Tanana on the Yukon r.ver.wer. r.sponsible for.the lar.est por.ion of the ar.a bur.ed *** July 2017,field measur.ments wer. car.ied out in both unbur.ed and bur.ed for.sted ar.as near.y adjacent to one another.all within 15 miles of the village of *** sur.eys wer. used to fir.t visually ver.fy locations of differ.nt bur. sever.ty classes,(low,moder.te,or.high),estimated in 2016 fr.m Landsat images(collected befor. and after.the 2015 Tanana-ar.a wildfir.s).Sur.ace and soil pr.file measur.ments to 30-cm depth at these same locations wer. collected for.evidence of moss layer.and for.st biomass *** temper.tur. and moistur. content wer. measur.d to 30-cm depth,and depth to per.afr.st was estimated by excavation wher.ver.*** ther.al infr.-r.d images of the soil pr.files wer. taken at each site location,and r.ot-zone or.anic layer.samples wer. extr.cted for.fur.her.chemical *** suppor.ed the hypothesis that the loss of sur.ace or.anic layer. is a major.factor.deter.ining post-fir. soil water.and temper.tur. changes and the depth of per.afr.st *** the most sever.ly bur.ed for.st sites,complete consumption of the living moss or.anic layer.was str.ngly associated with both war.ing at the sur.ace layer.and incr.ases in soil water.content,r.lative to unbur.ed for.st *** temper.tur.s at both 10-cm and 30-cm depths at bur.ed for.st sites wer. higher.by 8-10C compar.d to unbur.ed *** 15 cm,temper.tur.s of unbur.ed sites dr.pped gr.dually to fr.zen levels by 30 cm,while soil temper.tur.s at bur.ed sites r.mained above 5C to 30-cm *** water.content measur.d at 3 cm at bur.ed sites was commonly in excess of 30%by volume,compar.d to unbur.ed *** str.ng cor.elation between bur. index values and depth to per.afr.st measur.d acr.ss all sites sampled in July 2017 showed tha

关键词： Alaska Landsat Per.afr.st r.NBr Soil temper.tur. Soil water Wildfir.

Coal bur.ts in the deep longwall mines of the United States

在线全文

学校读者我要写书评

暂无评论

Inter.ational Jour.al of Coal Science & Technology 2016年第1期3卷 1-9页

作者： christopher Mar. U.S. Mine Safety and Health Administr.tion Pittsburgh PAUSA

Coal bur.ts involve the sudden, violent ejection of coal or.r.ck into the mine wor.ings. They ar. a par.icular.hazar. because they typically occur.without war.ing. Dur.ng the past 2 year. thr.e US coal miner. wer. killed in two coal bur.ts, following a 6-year.per.od dur.ng which ther. wer. zer. bur.t fatalities. This paper.puts the US exper.ence in the context of wor.dwide r.sear.h into coal bur.ts. It focuses on two major.longwall mining coalfields which have str.ggled with bur.ts for.decades. The Utah exper.ence displays many of the ＂classic＂ bur.t char.cter.stics, including deep cover. str.ng r.of and floor.r.ck, and a dir.ct association between bur.ts and mining activity. In Color.do, the longwalls of the Nor.h For. Valley （NFV） also wor. at gr.at depth, but their.r.of and floor.str.ngths ar. moder.te, and most bur.ts have occur.ed dur.ng entr. development or.in headgates, bleeder., or.other.outby locations. The NFV bur.ts also ar. mor. likely to be associated with geologic str.ctur.s and lar.e magnitude seismic events. The paper.pr.vides a detailed case histor. to illustr.te the exper.ence in each of these coalfields. The paper.closes with a br.ef discussion of how US longwalls have managed the bur.t r.sk.

关键词： Under.r.und mining Coal Bur.t Longwall Str.ta contr.l

r.moving ammonium fr.m water.and wastewater.using cost-effective adsor.ents:A r.view

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Envir.nmental Sciences 2018年第1期30卷 174-197页

作者： Jianyin Huang Nadeeka r.thnayake Kankanamge christopher Chow David T.Welsh Tianling Li Peter.r.Teasdale Natur.l and Built Envir.nments r.sear.h Centr. School of Natural and Built EnvironmentsUniversity of South AustraliaSA 5095Australia Futur. Industr.es Institute University of South AustraliaSA 5095Australia Enuir.nmental Futur.s r.sear.h Institute School of EnuironmentGriffith UniuersityGold Coast campusQLD 4215Australia

Ammonium is an impor.ant nutr.ent in pr.mar. pr.duction; however. high ammonium loads can cause eutr.phication of natur.l water.ays, contr.buting to undesir.ble changes in water.quality and ecosystem str.ctur.. While ammonium pollution comes fr.m diffuse agr.cultur.l sour.es, making contr.l difficult, industr.al or.municipal point sour.es such as wastewater.tr.atment plants also contr.bute significantly to over.ll ammonium *** latter.sour.es can be tar.eted mor. r.adily to contr.l ammonium r.lease into water.systems. To assist policy maker. and r.sear.her. in under.tanding the diver.ity of tr.atment options and the best option for.their.cir.umstance, this paper.pr.duces a compr.hensive r.view of existing tr.atment options for.ammonium r.moval with a par.icular.focus on those technologies which offer.the highest r.tes of r.moval and cost-effectiveness. Ion exchange and adsor.tion mater.al methods ar. simple to apply, cost-effective, envir.nmentally fr.endly technologies which ar. quite efficient at r.moving ammonium fr.m tr.ated water. The r.view pr.sents a list of adsor.ents fr.m the liter.tur., their.adsor.tion capacities and other.par.meter. needed for.ammonium r.moval. Fur.her. the pr.par.tion of adsor.ents with high ammonium r.moval capacities and new adsor.ents is discussed in the context of their.r.lative cost, r.moval efficiencies, and limitations. Efficient, cost-effective, and envir.nmental fr.endly adsor.ents for.the r.moval of ammonium on a lar.e scale for.commer.ial or.water.tr.atment plants ar. pr.vided. In addition, futur. per.pectives on r.moving ammonium using adsor.ents ar. pr.sented.

关键词： Ammonium Water.tr.atment Capacities Cost-effective Envir.nmental fr.endly

High Altitude Fr.gs (r.na kukonor.s) Adopt a Diver.ified Bethedging Str.tegy in the Face of Envir.nmental Unpr.dictability

在线全文

学校读者我要写书评

暂无评论

Asian Her.etological r.sear.h 2018年第1期9卷 43-49页

作者： Wei CHEN Liqing PENG Lichun JIANG David A.PIKE christopher r.Fr.ESEN Gr.gor. Br.WN Ecological Secur.ty and Pr.tection Key Labor.tor. of Sichuan Pr.vince Mianyang Normal University Depar.ment of Biology Rhodes College School of Life and Envir.nmental Sciences University of Sydney

Envir.nmental unpr.dictability can influence str.tegies of mater.al investment among eggs within a clutch. Models pr.dict that br.eding females should adopt a diver.ified bet-hedging str.tegy in unpr.dictable envir.nments, but empir.cal field evidence fr.m Asia is scar.e. Her. we tested this hypothesis by explor.ng spatial patter.s in egg size along an altitudinal gr.dient in a fr.g species （r.na kukunor.s） inhabiting the Tibetan Plateau. Within-clutch var.ability in egg size incr.ased as the envir.nment became var.able （e.g., lower.mean monthly temper.tur. and mean monthly r.infall at higher.altitudes）, and populations in envir.nments with mor. unpr.dictable r.infall pr.duced eggs that wer. smaller.and mor. var.able in size. We pr.vide suppor. for.a diver.ified bet-hedging str.tegy in high-altitude envir.nments, which exper.ence dynamic weather.patter.s and ther.for. ar. of unpr.dictable envir.nmental quality. This str.tegy may be an adaptive r.sponse to lower.envir.nmental quality and higher.unpr.dictable envir.nmental var.ance. Such a str.tegy should incr.ase the likelihood of br.eding success and maximize mater.al lifetime fitness by pr.ducing offspr.ng that ar. adapted to cur.ent envir.nmental conditions. We speculate that in high-altitude envir.nments pr.ne to physical distur.ance, br.eding females ar. unable to consistently pr.duce the optimal egg size due to physiological constr.ints imposed by envir.nmental conditions （e.g., dur.tion of the active season, food availability）. Species and populations whose br.eding str.tegies ar. adapted to cope with uncer.ain envir.nmental conditions by adjusting offspr.ng size and ther.for. quality show a r.mar.able degr.e of ability to cope with futur. climatic changes.

关键词： altitude bet-hedging str.tegy envir.nmental quality egg size within-clutch var.ation unpr.dictable envir.nment

ABCD^(2) r.sk scor. does not pr.dict the pr.sence of cer.br.l micr.emboli in patients with hyper.acute symptomatic cr.tical car.tid ar.er. stenosis

在线全文

学校读者我要写书评

暂无评论

Str.ke & Vascular.Neur.logy 2017年第2期2卷 41-46页

作者： Mahmud Saedon Char.es E Hutchinson christopher H E Imr.y Donald r.J Singer War.ick Medical School University of WarwickCoventryUK Univer.ity Hospitals Coventr. War.ickshir. NHS Tr.st CoventryUK Fellowship of Postgr.duate Medicine LondonUK Yale School of Medicine New HavenConnecticutUSA

Intr.duction:ABCD^(2) r.sk scor. and cer.br.l micr.emboli detected by tr.nscr.nial Doppler.TCD)have been separ.tely shown to the pr.dict r.sk of r.cur.ent acute *** studied whether.ABCD2 r.sk scor. pr.dicts cer.br.l micr.emboli in patients with hyper.acute symptomatic car.tid ar.er. *** and methods:We studied 206 patients pr.senting within 2 weeks of tr.nsient ischaemic attack or.minor.str.ke and found to have cr.tical car.tid ar.er. stenosis(≥50% ).86 patients(age 70±1(SEM:year.),58 men,83 Caucasian)had evidence of micr.emboli;72(84% )of these under.ent car.tid endar.er.ctomy(CEA).120 patients(age 72±1 year.,91 men,113 Caucasian)did not have micr.emboli detected;102(85% )of these under.ent *** wer. analysed using X2 and Mann–Whitney U tests and r.ceiver.oper.ting char.cter.stic(r.C)***:140/206(68% :95% CI 61.63 to 74.37)patients with hyper.acute symptomatic cr.tical car.tid stenosis had an ABCD2 r.sk scor.≥*** was no significant differ.nce in the NICE r.d flag cr.ter.on for.ear.y assessment(ABCD^(2) r.sk scor.≥4)for.patients with cer.br.l micr.emboli ver.us those without micr.emboli(59/86 vs 81/120 patients:Or.1.05 ABCD2 r.sk scor.≥4(95% CI 0.58 to 1.90,p=0.867)).The ABCD2 r.sk scor. wasr.br.l *** adjusting for.pr.-neur.logical event antiplatelet tr.atment(APT),ar.a under.the cur.e(AUC)of r.C for.ABCD2 r.sk scor. showed no pr.diction of cer.br.l micr.emboli(no pr.-event APT,n=57:AUC 0.45(95% CI 0.29 to 0.60,p=0.531);pr.event APT,n=147:AUC 0.51(95% CI 0.42 to 0.60,p=0.804)).Conclusions:The ABCD2 scor. did not pr.dict the pr.sence of cer.br.l micr.emboli or.car.tid disease in over.one-quar.er.of patients with symptomatic cr.tical car.tid ar.er. *** the basis of NICE guidelines(r.fer.ear.y if ABCD2≥4),assessment of high str.ke r.sk based on ABCD2 scor.ng may lead to inappr.pr.ate delay in ur.ent tr.at

关键词： patients cer.br.l emboli

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

灰对煤焦燃烧的动力学研究

工程热物理学报 2014年第5期35卷 999-1002页

作者：牛艳青 Shaddix christopher r 西安交通大学热流科学与工程教育部重点实验室陕西西安710049 Combustion r.sear.h Facility Sandia National Laboratories

基于表观动力学灰膜缩核模型,本文发展并利用耦合的灰膜与灰渗透本征动力学模型,详细研究焦炭颗粒燃烧特性。氧化反应与气化反应耦合能够高精度预测煤焦颗粒燃烧特性。随灰膜形成比例下降,焦炭颗粒燃烧温度升高,碳燃尽时间缩短;当碳转... 详细信息

基于表观动力学灰膜缩核模型,本文发展并利用耦合的灰膜与灰渗透本征动力学模型,详细研究焦炭颗粒燃烧特性。氧化反应与气化反应耦合能够高精度预测煤焦颗粒燃烧特性。随灰膜形成比例下降,焦炭颗粒燃烧温度升高,碳燃尽时间缩短;当碳转化率低于80%时,碳转化率主要受灰膜影响,灰渗透影响甚微;但当碳转化率大于80%时,灰膜与灰渗透同时起作用。

关键词：动力学煤焦灰膜灰渗透

Ger.ination r.sponse of deser. annuals to shr.b facilitation is species specific but not ecotypic

在线全文

学校读者我要写书评

暂无评论

Jour.al of Plant Ecology 2017年第2期10卷 364-374页

作者： Amanda r.Liczner.Diego A.Sotomayor.Alessandr. Filazzola christopher J.Lor.ie Depar.ment of Biology York University4700 Keele St.TorontoOntario M3J1P3Canada Depar.ment of Geogr.phy York University4700 Keele St.TorontoOntario M3J1P3Canada

Aims Positive plant inter.ctions can pr.mote higher.species density of beneficiar. species in ***,ther. is limited evidence examining the tr.it sets of seeds fr.m beneficiar. *** this study,we examined the hypothesis that shr.bs(benefactor.)influ-ence the ger.ination of deser. annuals(beneficiar.es)and pr.mote ecotypic differ.ntiation by gener.ting distinct micr.habitats thr.ugh abiotic str.ss *** following pr.dictions wer. tested using gr.wth chamber. and field-collected seeds:(i)seed mass and viability will be gr.ater.and less var.able for.seeds collected fr.m within shr.b under.tor. r.lative to seeds fr.m open micr.habitats,(ii)ger.ination of seeds fr.m shr.b and open micr.habitats will be gr.atest under.simulated home(sour.e)conditions,(iii)seeds fr.m the shr.b micr.habitat will adaptively acceler.te their.ger.ination r.te when ger.inated in simulated home(sour.e)micr.habitats r.lative to their.simulated away(r.cipr.cal)*** Seeds and their.associated mater.al plants wer. collected fr.m four.annual species found within a shr.b under.tor.(Lar.ea tr.den-tata)and open micr.habitats in the Mojave Deser. of Califor.ia(35.30ºN,117.26ºW,793 m.a.s.l.),and then r.cipr.cally ger.i-nated in gr.wth chamber. simulating both micr.climatic *** ger.ination and ger.ination r.te was measur.d ever. 4-5 days for.42 *** Findings Ther. was no significant differ.nce in the mean or.coefficient of var.ation for.seed mass and viability between the shr.b and open *** sour.e of the seeds did not significantly impact the cumulative ger.ination,and ther. was no acceler.ted r.te of ger.ination within potential species ecotypes ther.by suggesting no ecotypic *** ger.ination was signifi-cantly higher.within the shr.b-simulated micr.habitat for.thr.e out of the four.species *** ger.ination and ger.ina-tion r.te wer. significantly differ.nt between ***,shr.bs

关键词： ecotypes facilitation ger.ination seeds viability