检索结果-南通市图书馆

How Deep Lea.ning Networks could be Designed to Loca.e Minera. Deposits

在线全文

学校读者我要写书评

暂无评论

Journa. of Ea.th Science 2021年第2期32卷 288-292页

作者： donald a.singer 10191 N.Bla.ey a.e. Cupertino 95014CA USA

Whether using a.sha.low neura. network with one hidden la.er,or a.deep network with ma.y hidden la.ers,the tra.ning da.a.must represent subgroups of the deposit type being explored to be *** exa.ples of neura. networks ha.e mostly been limited to one individua. minera. deposit for *** of geologic fea.ures a.ong deposits within a.type a.e so la.ge tha. a.single deposit ca.not provide proper informa.ion to tra.n a.neura. net to genera.ize a.d guide explora.ion for other *** tra.ned with only one deposit tend to be a.a.emic successes but a.e not of pra.tica. va.ue in explora.ion for other *** is why it ta.es much experience exa.ining ma.y deposits to properly tra.n a. economic geologist—a.neura. network is not a.y *** exa.ples of sha.low neura. networks a.e used to demonstra.e the power of neura. networks to possibly loca.e undiscovered deposits a.d to provide some suggestions of how to dea. with missing *** tra.ning da.a.needs to include informa.ion spa.ia.ly rela.ed to known deposits a.d hopefully informa.ion from ma.y different deposits of the *** lea.ned from these a.d other exa.ples point to a.proposed sa.pling pla. for da.a.tha. could lea. to a.genera.ized neura. network for *** this pla.,10 or more well-explored gold-rich porphyry copper deposits from a.ound the world with 100 or more sa.ple sites nea. a.d some dista.ce from ea.h deposit would proba.ly ca.ture importa.t va.ia.ility a.ong such deposits a.d provide proper da.a.to tra.n a.d test a.sha.low neura. network to predict loca.ions of undiscovered deposits.

关键词： porphyry copper tra.ning neura. networks missing observa.ions

在线全文

学校读者我要写书评

暂无评论

资源定量评价发展方向展望

地球科学（中国地质大学学报） 2001年第2期26卷 152-156页

作者： donald a.singer 美国地质调查所

未来的资源定量评价希望能够评估未发现矿产资源的量、价值并对其进行定位预测 ,以能够表达矿产资源的经济潜力和不确定性 .近年来金属价格的长期下跌提出了对更大型的矿床的需求 .敏感度分析表明了减少评价中不确定性和风险的最有效途... 详细信息

未来的资源定量评价希望能够评估未发现矿产资源的量、价值并对其进行定位预测 ,以能够表达矿产资源的经济潜力和不确定性 .近年来金属价格的长期下跌提出了对更大型的矿床的需求 .敏感度分析表明了减少评价中不确定性和风险的最有效途径是降低有关吨位估计因素的不确定性 .到目前为止 ,在评价中所有可能造成误差的因素中 ,那些与吨位估计误差有关的因素是最重要的 .鉴于吨位模型的绝对重要地位以及矿床模型是吨位最有效的预测手段 ,正确地选择矿床模型是控制误差最重要的途径 .地表大部分地区被大面积裸露的岩石和沉积物所覆盖 .由于很多出露地表的矿床已经被发现 ,人们开始把注意力转向盖层下面岩石可能显露的矿化信息上 .这些区域的资源评价必需依靠对其周边地区的外推、地下覆盖岩石新的地质填图或者通过在其他成功勘探区获得的经验进行类推 .盖层对评价的不确定性以及评价的方法与程序都具有深远的影响 ,因为地下地质现象的不可见性和地球物理方法所获得的是一种被削弱了的信息 .许多早期的评价方法都是基于从那些出露地表的矿床中总结出的地球化学和地球物理变量之间的关系而进行的 ,而现在我们同样需要研究基于地下隐伏矿床的勘探经验 .矿床模型在资源定量评价中的重要地位基于以下两个原因 :(1)

关键词：矿床模型品位-吨位模型经济模型勘查风险矿产资源资源定量评价

a.CD^(2) risk score does not predict the presence of cerebra. microemboli in pa.ients with hyper-a.ute symptoma.ic critica. ca.otid a.tery stenosis

在线全文

学校读者我要写书评

暂无评论

Stroke & Va.cula. Neurology 2017年第2期2卷 41-46页

作者： Ma.mud Sa.don Cha.les E Hutchinson Christopher H E Imra. donald R J singer Wa.wick Medica. School University of WarwickCoventryUK University Hospita.s Coventry Wa.wickshire NHS Trust CoventryUK Fellowship of Postgra.ua.e Medicine LondonUK Ya.e School of Medicine New HavenConnecticutUSA

Introduction:a.CD^(2) risk score a.d cerebra. microemboli detected by tra.scra.ia. Doppler(TCD)ha.e been sepa.a.ely shown to the predict risk of recurrent a.ute *** studied whether a.CD2 risk score predicts cerebra. microemboli in pa.ients with hyper-a.ute symptoma.ic ca.otid a.tery *** a.d methods:We studied 206 pa.ients presenting within 2 weeks of tra.sient ischa.mic a.ta.k or minor stroke a.d found to ha.e critica. ca.otid a.tery stenosis(≥50% ).86 pa.ients(a.e 70±1(SEM:yea.s),58 men,83 Ca.ca.ia.)ha. evidence of microemboli;72(84% )of these underwent ca.otid enda.terectomy(CEa..120 pa.ients(a.e 72±1 yea.s,91 men,113 Ca.ca.ia.)did not ha.e microemboli detected;102(85% )of these underwent *** were a.a.ysed using X2 a.d Ma.n–Whitney U tests a.d receiver opera.ing cha.a.teristic(ROC)***:140/206(68% :95% CI 61.63 to 74.37)pa.ients with hyper-a.ute symptoma.ic critica. ca.otid stenosis ha. a. a.CD2 risk score≥*** wa. no significa.t difference in the NICE red fla. criterion for ea.ly a.sessment(a.CD^(2) risk score≥4)for pa.ients with cerebra. microemboli versus those without microemboli(59/86 vs 81/120 pa.ients:OR 1.05 a.CD2 risk score≥4(95% CI 0.58 to 1.90,p=0.867)).The a.CD2 risk score wa.a.ients a.d in 39 of 120(31% :95% CI 23 to 39)without cerebra. *** a.justing for pre-neurologica. event a.tipla.elet trea.ment(a.T),a.ea.under the curve(a.C)of ROC for a.CD2 risk score showed no prediction of cerebra. microemboli(no pre-event a.T,n=57:a.C 0.45(95% CI 0.29 to 0.60,p=0.531);preevent a.T,n=147:a.C 0.51(95% CI 0.42 to 0.60,p=0.804)).Conclusions:The a.CD2 score did not predict the presence of cerebra. microemboli or ca.otid disea.e in over one-qua.ter of pa.ients with symptoma.ic critica. ca.otid a.tery *** the ba.is of NICE guidelines(refer ea.ly if a.CD2≥4),a.sessment of high stroke risk ba.ed on a.CD2 scoring ma. lea. to ina.propria.e dela. in urgent trea.

关键词： pa.ients cerebra. emboli

Development, coinfection, a.d the syndemics of pregna.cy in Sub-Sa.a.a. a.rica

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Infectious Disea.es of Poverty 2013年第1期2卷 213-222页

作者： Merrill singer Depa.tment of a.thropology a.d Depa.tment of Community Medicine University of ConnecticutStorrsCT 06269USA

Nota.le a.ong ga.s in the a.hievement of the globa. hea.th Millennium Development Goa.s(MDG)a.e shortcomings in a.dressing ma.erna. hea.th,a. issue a.dressed in the fifth *** shortfa.l is pa.ticula.ly a.ute in Sub-Sa.a.a. a.rica.SSa.,where over ha.f of a.l ma.erna. dea.hs occur ea.h *** there is not a. yet a.comprehensive understa.ding of the biologica. a.d socia. ca.ses of ma.erna. dea.h in SSa.it is evident tha. poverty,gendered economic ma.gina.iza.ion,socia. disruptions,hindered a.cess to ca.e,unevenness in the qua.ity of ca.e,illega. a.d cla.destine a.ortions,a.d infections a.e a.l critica. *** these fa.tors,this pa.er presents a.review of the existing litera.ure on ma.erna. hea.th in SSa.to a.gue tha. syndemics constitute a.significa.t a.ditiona. source of ma.erna. morbidity a.d morta.ity in the *** focus on the na.ure,prevention,a.d trea.ment of syndemics,a. a.result,should be pa.t a.d pa.cel of improving ma.erna. hea.th in SSa.

关键词： Syndemics Coinfection Ma.erna. hea.th Sub-Sa.a.a. a.rica Millennium development goa.s

Registry report on prediction by Pocock ca.diova.cula. score of cerebra. microemboli a.utely following ca.otid enda.terectomy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stroke & Va.cula. Neurology 2018年第3期3卷 147-152页

作者： Ma.mud Sa.don a.ha.a.ios Sa.a.zis Ra.hel W S Lee Cha.les E Hutchinson Christopher H E Imra. donald R J singer Nottingha. University Hospita.s NHS Trust NottinghamUK University Hospita.s Coventry a.d Wa.wickshire NHS Trust CoventryUK Leicester Roya. Infirma.y LeicesterUK Ya.e School of Medicine New HavenConnecticutUSA Fellowship of Postgra.ua.e Medicine LondonUK

ba.kground Cerebra. microemboli ma. lea. to ischa.mic neurologica. complica.ions a.ter ca.otid enda.terectomy(CEa..The a.socia.ion between cla.sica. ca.diova.cula. risk fa.tors a.d a.ute cerebra. microemboli following ca.otid surgery ha. not been *** a.m of this study wa. to explore whether a. esta.lished ca.diova.cula. risk score(Pocock score)predicts the presence of cerebra. microemboli a.utely a.ter *** a.d methods Pocock scores were a.sessed for the 670 pa.ients from the Ca.otid Surgery Registry(a.e 71±1(SEM)yea.s,474(71%)ma.e,652(97%)Ca.ca.ia.)ma.a.ed from Ja.ua.y 2002 to December 2012 in the Regiona. Va.cula. Centre a. University Hospita.s Coventry a.d Wa.wickshire NHS Trust,which serves a.popula.ion of *** wa. underta.en in 474(71%)pa.ients for symptoma.ic ca.otid stenosis a.d in 196(25%)a.ymptoma.ic pa.ients during the sa.e period.74% of pa.ients were hypertensive,71%were smokers a.d 49% ha. *** a.high Pocock score(≥2.3%)wa. significa.tly a.socia.ed with evidence of cerebra. microemboli a.utely following CEa.P=0.039,Ma.n-Whitney(MW)test).a.Pocock score(≥2.3%)did not predict pa.ients who required a.ditiona. a.tipla.elet thera.y(microemboli signa.(MES)ra.e>50 hour-1:P=0.164,MW test).Receiver opera.ing cha.a.teristic a.a.ysis a.so showed tha. the Pocock score predicts a.ute postopera.ive microemboli(a.ea.under the curve(a.C)0.546,95%CI 0.502 to 0.590,P=0.039)but not a.high ra.e of postopera.ive microemboli(MES>50 hour−1:a.C 0.546,95% CI 0.482 to 0.610,P=0.164).a.Pocock score≥2.3% showed a.sensitivity of 74% for the presence of a.ute postopera.ive cerebra. microemboli.a.Pocock score≥2.3% a.so showed a.sensitivity of 77% a.d a.nega.ive predictive va.ue of 90% for pa.ients who developed a.high microembolic ra.e>50 hour−1 a.ter ca.otid *** These findings demonstra.e tha. the Pocock score could be used a. a.clinica. tool to identify pa.ients a. high risk of developing a.ute postopera.ive microemboli.

关键词： cerebra. Surgery Registry

Eva.ua.ion of supra.hia.ma.ic nucleus in a.zheimer’s disea.e with non-inva.ive ma.netic resona.ce methods

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neura. Regenera.ion Resea.ch 2022年第8期17卷 1753-1754页

作者： Rico singer a.a.ia Leiden Institute of Chemistry Leiden UniversityLeidenThe Netherlands Institute of Medica. Physics a.d Biophysics University of LeipzigLeipzigGermany

The supra.hia.ma.ic nucleus a.d a.zheimer’s disea.e(a.):a. is the most frequently dia.nosed form of dementia.with the tota. number of a. pa.ients worldwide expected to triple by 2050 compa.ed to 2015(Prince et a..,2015).Despite yea.s of resea.ch,much of the a. pa.hology rema.ns unclea. with no trea.ment or cure *** its two ha.lma.ks,a.yloid-β(a.)pla.ues a.d hyperphosphoryla.ed ta. ta.gles,a.distortion of circa.ia. rhythms is commonly ***,poor sleep qua.ity or trouble fa.ling a.leep a.e common a. symptoms,sometimes developing 10-15 yea.s before cognitive symptoms a.socia.ed with a.(Ju et a..,2014).

关键词： a.. a.zheimer supra

Surfa.e Ma.rofa.ric of Boulder Domina.ed Desert Mounta.n Slopes, Ca.ifornia. USA

在线全文

学校读者我要写书评

暂无评论

Journa. of Mounta.n Science 2005年第3期2卷 181-192页

作者： donald a. FRIEND Depa.tment of Geogra.hy Minnesota State University 7 Armstrong Hall Mankato MN 56001-6026 USA

Rhyolite domes formed over a.million yea. continuum in ea.tern Ca.ifornia.a.e used to study boulder domina.ed slopes. Slopes in this study a.e steep （-25°to-35°） a.d a.e ma.e of coa.se boulder sized blocks. These slopes include well va.nished vertica.ly oriented colluvia. deposits tha. ha.e been likened to relict perigla.ia. stone stripes, or a. indica.ed in this study, a.e the result of ongoing desert slope processes. The deposits a.e common throughout the a.id southwestern US, but their morphometric cha.a.ter, fa.ric, a.d ra.es of forma.ion ha.e not been a.sessed systema.ica.ly. Results indica.e tha. boulder deposits exa.ined here a.e remna.t from the origina. surfa.e formed during volca.ic eruption a.d tha. these boulder slope deposits evolve slowly. Gra.n size, gra.n sha.e a.d gra.n a.gula.ity do not cha.ge significa.tly from genesis to -0.6 Ma. trends in the da.a.cha.ge ma.kedly a.ter tha. time. Mea. eigenvectors indica.e a.fa.ric oriented downhill, pa.a.lel to the slope, consistent with the visua. impression tha. long thin to pla.e-like rocks orient themselves simila.ly; however, fa.ric is a.tua.ly ra.domly dispersed, simila. to tha. a. slope genesis, a. indica.ed by the eigenva.ue a.a.ysis resulta.ts of C a.d K. Interestingly, gra.nsrema.n or become more a.gula. over the million-yea. time sca.e of the study a. they decrea.e in size, indica.ing a.tive in situ wea.hering processes on individua. gra.ns; this result is counter to the common a.sumption tha. a. gra.ns wea.her they become more rounded over time.

关键词： Boulder-fields desert-slopes ma.rofa.ric

Interca.ibra.ion of 40a./39a. la.ora.ories in China. the USa.a.d Russia.for Emeisha. volca.ism a.d the Gua.a.upia.–Lopingia. bounda.y

在线全文

学校读者我要写书评

暂无评论

Na.iona. Science Review 2019年第4期6卷 614-616页

作者： Bria. R.Jicha.Bra. S.singer Youjua. Li Depa.tment of Geoscience University of Wisconsin-Madison Sta.e Key la.ora.ory of Ea.thqua.e Dyna.ics Institute of GeologyChina Earthquake Administration

Precise geochronology is essentia. for constra.ning ra.es of sedimenta.y,biotic, clima.ic a.d ma.ma.ic processes over a.wide ra.ge of timesca.es throughout Ea.th’s history. Ta.gets for high-precision geochronology include la.a.flows or minera.s from volca.ic tuffs tha. a.e interbedded within sedimenta.y stra.a. High-precision da.es from these ma.eria.s commonly provide tempora. a.chors, a.low dispa.a.e stra.igra.hic records to be correla.ed with one a.-

关键词： the USa.a.d Russia.for Emeisha. volca.ism a.d the Gua.a.upia. a. la.ora.ories in China Interca.ibra.ion of a. Lopingia. bounda.y USA

Cha.ges in response properties of nociceptive dorsa. horn neurons in a.murine model of ca.cer pa.n

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

生理学报 2008年第5期60卷 635-644页

作者： donald a. Simone Sergey G. Kha.a.ov Da.ryl T. Ha.a.oto Depa.tment of Dia.nostic a.d Biologica. Sciences School of Dentistry University of Minnesota 515 Delaware St. S.E.Minneapolis Minnesota 55455 USA

Pa.n a.socia.ed with ca.cer tha. meta.ta.izes to bone is often severe a.d debilita.ing.a.better understa.ding of the neura. mecha.isms tha. media.e ca.cer pa.n is needed for the development of more effective *** this study,we used a. esta.lished model of ca.cer pa.n to cha.a.terize cha.ges in response properties of dorsa. horn *** cells were impla.ted into a.d a.ound the ca.ca.eus bone in mice a.d extra.ellula. electrophysiologica. recordings were ma.e from wide dyna.ic ra.ge(WDR) a.d high threshold(HT) dorsa. horn *** of WDR a.d HT neurons evoked by mecha.ica.,hea.,a.d cold stimuli a.plied to the pla.ta. surfa.e of the hind pa. were compa.ed between tumor bea.ing mice a.d control *** exhibited hypera.gesia.to mecha.ica. a.d hea. stimuli a.plied to their tumor-bea.ing hind *** neurons in tumor-bea.ing mice exhibited a. increa.e in sponta.eous a.tivity,a.d enha.ced responses to mecha.ica.,hea.,a.d cold stimuli a. compa.ed to *** findings show tha. sensitiza.ion of WDR neurons,but not HT neurons,contributes to tumor-evoked hypera.gesia.

关键词：反应特征感觉神经元临床分析癌症