检索结果-南通市图书馆

Va.ida.ing the Ca.ifornia.Puff (Ca.PUFF) Modelling System Using a. Industria. a.ea.in a.cra. Gha.a.a. a.Ca.e Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journa. of a.r Pollution 2016年第1期5卷 27-36页

作者： H. a. a.fum E. H. k. a.0}ho J. J. Niemela.V. a.menio k. a. danso Depa.tment of Nuclea. Sciences a.d a.plica.ion School of Nuclear and Allied Sciences University of Ghana Legon Ghana Depa.tment of Nuclea. Engineering School of Nuclear and Allied Sciences University of Ghana Legon Ghana a.plied Physics Section International Centre for Theoretical Physics Trieste Italy Dipa.timento di Ingegneria.e a.chitettura Universita di Trieste Trieste Italia

The performa.ce of the Ca.ifornia.Puff (Ca.PUFF) modelling system ha. been eva.ua.ed using a.ca.e study in Gha.a. The performa.ce eva.ua.ion consisted of a.qua.tita.ive compa.ison of dispersion simula.ion results of SO2 a.d NO2 with mea.urements a. the Tema.Oil Refinery, a.d meteorologica. simula.ion results with observa.ions from the Tema.Meteorologica. Sta.ion, both in the Grea.er a.cra.region of Gha.a. Four sta.istica. indica.ors—Index of a.reement (IOa., Fra.tiona. Bia. (FB), Norma.ized Mea. Squa.e Error (NMSE) a.d the Pea.son correla.ion coefficient(R) employed in the a.sessment indica.e sufficient relia.ility of both Ca.PUFF a.d its meteorologica. simula.or, Ca.MET. IOa.va.ues of 0.73 a.d 0.67 a.d FB va.ues of 1.65 a.d 1.42 were obta.ned for SO2 a.d NO2 respectively. IOa.between mea.ured a.d modelled emissions were 0.72 a.d 0.69 for SO2 a.d NO2 respectively. The correla.ions between the simula.ed a.d observed emission were 0.66 a.d 0.08 for SO2 a.d NO2 respectively. a. IOa.va.ue of 0.66 wa. obta.ned for both wind speed a.d wind direction with correla.ions of 0.29 a.d 0.58 in compa.ison with observa.ions from the meteorologica. sta.ion.

关键词： Performa.ce Eva.ua.ion Emissions Dispersion Observa.ions

Determina.ion of Flow Structure in a.Gold Lea.hing Ta.k.by CFD Simula.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of a.plied Ma.hema.ics a.d Physics 2014年第7期2卷 510-519页

作者： C. P. k. Da.a.u Z. Stegowsk. L. Furma. E. H. k. a.0}ho k. a. danso Fa.ulty of Physics a.d a.plied Computer Science AGH-UST Krakow Poland Gha.a.a.omic Energy Commission Legon Accra Ghana

Experimenta. residence time distribution (RTD) mea.urement a.d computa.iona. fluid dyna.ics (CFD) simula.ion a.e the best methods to study the hydrodyna.ics of process flow systems. However, CFD a.proa.h lea.s to better understa.ding of the flow structure a.d extent of mixing in stirred ta.k.. In the present study, CFD models were used to simula.e the flow in a. industria. gold lea.hing ta.k. The objective of the investiga.ion wa. to cha.a.terize the flowfield genera.ed within the ta.k.a.ter process intensifica.ion. The flow wa. simula.ed using a. Euleria.-Euleria. multi-fluid model where the Ra.S sta.da.d k.ixture model a.d a.multiple reference fra.e a.proa.h were used to model turbulence a.d impeller rota.ion respectively. The simula.ed flowfield wa. found to be in a.reement with the flow pa.tern of pitched bla.e a.ia.-flow impellers tha. wa. used for mixing. The lea.hing ta.k.exhibited good “off-bottom suspension” which revea.s minimum deposition of gold ore pa.ticles on the bottom of the lea.hing ta.k.. Simula.ion results were consistent with experimenta. results obta.ned from a.ra.ioa.tive tra.er investiga.ion. CFD a.proa.h ga.e a.better description of the flow structure a.d extent of mixing in a.lea.hing ta.k. Hence it could be a.preferred a.proa.h for flow system a.a.ysis where the cost of experimenta.ion is high.

关键词： Residence Time Distribution Computa.iona. Fluid Dyna.ics Na.ier Stok.s Equa.ions Euleria.-Euleria. Multi-Fluid Model Ra.S Sta.da.d k.ε Mixture Model Multiple Reference Fra.e

Eva.ua.ion of Qua.ity of Some Reha.ilita.ed Mined Soils within the a.gloGold-a.ha.ti Concession in Gha.a

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interna.iona. Journa. of Geosciences 2012年第1期3卷 50-61页

作者： Witma.n H. k. Dorgbetor Ga.riel N. N. Dowuona.Seth k. a. danso Julius k. a.a.ek.or a.oa.e O. Ogunk.nle Enoch Boa.eng Depa.tment of Soil Science School of Agriculture University of Ghana Legon Ghana

La.d degra.a.ion ca.sed by surfa.e mining of gold ha. been extensive in Gha.a. In recent yea.s reha.ilita.ion of some degra.ed la.ds by re-vegeta.ion ha. been underta.0}n. This study provides qua.tita.ive da.a.on the qua.ity of some reha.ilita.ed a.d un-reha.ilita.ed mined soils within the a.gloGold-a.ha.ti gold concession in pa.ts of the semi-deciduous forest zone of Gha.a. Soil properties determined included texture, bulk.density a.d a.grega.e sta.ility, pH, orga.ic ca.bon, a.a.la.le phosphorus, tota. nitrogen, ca.ion excha.ge ca.a.ity, excha.gea.le ba.es, excha.ge a.idity, Fe, Mn, Ni, Cu, Zn, Cd, a.d Pb. a.grega.e sta.ility a. a.physica. qua.ity indica.or revea.ed tha. a.grega.es of the reha.ilita.ed mined soil ha. become more sta.le a.d simila. to the control unmined soil due to litter a.d ca.bon a.ditions from pla.ted trees. The nutrient levels were very low beca.se of the presence of low a.tivity cla.s inherent in the na.ive soil. Orga.ic ca.bon content in the reha.ilita.ed soil ha. increa.ed a.ove tha. of the unreha.ilita.ed soil. Va.ia.ility in soil properties, especia.ly orga.ic ca.bon a.d a.grega.e sta.ility, wa. minima. in the unmined a.d reha.ilita.ed soils implying tha. soils a. the two sites were most robust a.d resista.t to crushing a.d rupture. Qua.ity index of the unmined control soil wa. 36.5% indica.ing tha. the qua.ity of the soil wa. 63.5% rela.ive to the optimum qua.ity beca.se of inherent poor soil properties. The mined reha.ilita.ed a.d unreha.ilita.ed soil ha. index va.ues of 32.5% a.d 24.4 %, respectively. The ma.gina. difference of 4% in soil qua.ity between the control a.d reha.ilita.ed soil shows tha. it is possible to ma.nta.n the hea.th of soils with inherent physica. a.d biochemica. deficiencies if recla.a.ion regula.ions a.e a.hered to. In this wa., the socio-economic dilemma.of exploiting na.ura. resources for the benefit of societies is a.eliora.ed while ma.nta.ning a. ecosystem ba.a.ce.

关键词： a.grega.e Sta.ility Mea. Weight Dia.eter Mined Soils Soil Reha.ilita.ion Soil Va.ia.ility Soil Qua.ity Index

Effect of La.eritic Stone a.grega.e a.d Coconut Husk.Fiber on the Properties of Concrete

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journa. of Civil Engineering 2024年第2期14卷 240-257页

作者： Edmund Borbi Humphrey danso Emma.uel a.pia.-k.bi Depa.tment of Construction Technology a.d Ma.a.ement Educa.ion Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Kumasi Ghana Depa.tment of a.chitecture a.d Civil Engineering Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Kumasi Ghana

Na.ura. stone a.grega.e forms the bulk.volume of concrete a.d ha. contributed to the increa.ed cost of concrete production. This ha. led to the sea.ch for a.terna.e a.grega.es such a. la.eritic stone for concrete production. This pa.er investiga.es the engineering properties of concrete produced with la.eritic a.grega.e (La. a. the coa.se a.grega.e repla.ement a.d coconut husk.fibre (CHF) a. reinforcement. Na.ura. stone a.grega.e wa. repla.ed by La.a. 0%, 10%, 20%, 30%, 40%, a.d 50%, with 0.25% consta.t CHF by weight. a.mix proportion of 1:1.5:3 with a.wa.er-cement ra.io of 0.6 wa. used for producing concrete. a.tota. of 162 specimens (90 cubes a.d 72 bea.s) were prepa.ed a.d tested a. the 7, 14, 21, a.d 28 da.s of curing. The highest compressive strength wa. 43.36 N/mm2 (10% La.repla.ement) a. compa.ed to the control of 41.51 N/mm2. The 10% La.repla.ement obta.ned the highest flexura. strength of 5.35 N/mm2 a. compa.ed with the 5.29 N/mm2 for the control. The wa.er a.sorption of the concrete increa.ed from 2.8% (control) to 3.57% (50% repla.ement La.. Sca.ning electron microscopy (SEM) revea.ed micro ga.s between CHF a.d La.concrete. The study, therefore, concludes tha. the use of La.a.d CHF positively influenced the strength properties of concrete. 10% La.repla.ement of coa.se a.grega.e a.d 0.25% CHF is recommended to pra.titioners for use.

关键词： Concrete Coa.se a.grega.e Compressive Strength Flexura. Strength Na.ura. Stone a.grega.e SEM

LiDa.-ba.ed estima.ion of bounding box coordina.es using Ga.ssia. process regression a.d pa.ticle swa.m optimiza.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomimetic Intelligence & Robotics 2024年第1期4卷 24-35页

作者： Vinodha.k. E.S.Gopi Tusha. a.nibhoj Depa.tment of Electronics a.d Communica.ion Engineering National Institute of Technology TiruchirappalliTamil Nadu620015India

Ca.era.ba.ed object tra.k.ng systems in a.given closed environment la.k.priva.y a.d *** this study,light detection a.d ra.ging(LiDa.)wa. a.plied to tra.k.objects simila. to the ca.era.tra.k.ng in a.closed environment,gua.a.teeing priva.y a.d *** prima.y objective wa. to demonstra.e the effica.y of the proposed technique through ca.efully designed experiments conducted using two *** Scena.io I,the study illustra.es the ca.a.ility of the proposed technique to detect the loca.ions of multiple objects positioned on a.fla. surfa.e,a.hieved by a.a.yzing LiDa. da.a.collected from severa. loca.ions within the closed *** II demonstra.es the effectiveness of the proposed technique in detecting multiple objects using LiDa. da.a.obta.ned from a.single,fixed ***-time experiments a.e conducted with huma. subjects na.iga.ing predefined *** individua.s move within a. environment,while LiDa.,fixed a. the center,dyna.ica.ly tra.k. a.d identifies their loca.ions a. multiple *** demonstra.e tha. a.single,stra.egica.ly positioned LiDa. ca. a.eptly detect objects in motion a.ound ***,this study provides a.compa.ison of va.ious regression techniques for predicting bounding box *** process regression(GPR),combined with pa.ticle swa.m optimiza.ion(PSO)for prediction,a.hieves the lowest prediction mea. squa.e error of a.l the regression techniques exa.ined a. *** tuning of GPR using PSO significa.tly minimizes the regression *** of the experiment pa.e the wa. for its extension to va.ious rea.-time a.plica.ions such a. crowd ma.a.ement in ma.ls,surveilla.ce systems,a.d va.ious Internet of Things scena.ios.

关键词： LiDa. Da.a.a.quisition Bounding box Ga.ssia. process regression Pa.ticle swa.m optimiza.ion(PSO)

a.new route to wea.0}force sensing beyond SQL: Squeezed ma.nons in ca.ity ma.nomecha.ics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China.Physics,Mecha.ics & a.tronomy) 2024年第10期Mechanics & Astronomy) .卷 170-171页

作者： ?.k.?zdemir Depa.tment of Engineering Science a.d Mecha.ics and Materials Research Institute (MRI)The Pennsylvania State University

Qua.tum mecha.ics imposes limits on mea.urement a.cura.y through qua.tum noise which typica.ly ha. two components: First is the shot noise origina.ing from va.uum fluctua.ions a.d referred to a. the imprecision noise. Second is the qua.tum ba.k.ction origina.ing from the “a.tion” of the mea.urement ba.k.on the object being mea.ured.

关键词：

Expa.ding the Use of Nipple-Spa.ing Ma.tectomies in Obese Pa.ients Undergoing Sta.ed Impla.t-Ba.ed Reconstruction

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Modern Pla.tic Surgery 2024年第3期14卷 23-35页

作者： Ma.lory a. Rowley Pra.ha.t k. Upa.hya.a College of Medicine SUNY Upstate Medical University Syracuse USA Depa.tment of Surgery SUNY Upstate Medical University Syracuse USA

Ba.k.round: a.va.ta.es of va.ious ma.tectomy techniques include sk.n reduction a.d fa.ora.le a.sthetics in Wise-pa.tern closures, a.d less visible sca.s in nipple-spa.ing ma.tectomies (NSM). This study compa.es postopera.ive complica.ion profiles between Wise-pa.tern a.d nipple-spa.ing ma.tectomies in the obese popula.ion. Methods: a.retrospective cha.t review of obese pa.ients (BMI ≥ 30) who underwent sta.ed brea.t reconstruction following Wise-pa.tern a.d nipple-spa.ing ma.tectomies a. our institution between Februa.y 2016 a.d Ja.ua.y 2020 wa. conducted. Complica.ions between cohorts were a.a.yzed using the independent sa.ples t-test (2-sided) a.d the χ2 test. Results: a.tota. of 232 brea.ts (163 Wise-pa.tern, 69 NSM) were re-constructed in 123 obese fema.e pa.ients (85 Wise-pa.tern, 38 NSM). Complica.ion ra.es in both the Wise-pa.tern a.d NSM pa.ient cohorts were simila. following sta.e 1 (Wise-pa.tern: 30.7%, NSM: 39.1%, p = 0.212) a.d sta.e 2 (Wise-pa.tern: 16.6%, NSM: 15.9%, p = 0.907) of reconstruction. No sta.istica.ly significa.t differences in ra.es of infection, dehiscence, seroma. hema.oma.or ma.position of tissue expa.der (TE)/impla.t following sta.e 1 or sta.e 2 were found between cohorts. Conclusions: There were no significa.t differences in postopera.ive complica.ion ra.es between the Wise-pa.tern a.d NSM cohorts of obese pa.ients. NSM ca. be a.via.le surgica. option in ca.efully selected obese pa.ients a.d offer the a.va.ta.e of concea.ed sca.ring.

关键词： Ma.tectomy Brea.t Reconstruction Nipple-Spa.ing

First-principles ca.cula.ions to investiga.e structura.,electronic,ma.netic,optica. a.d thermodyna.ic properties of RE_(2)Rh_(3)Ge(RE=Pr,Sm)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Ra.e Ea.ths 2024年第7期42卷 1385-1393,I0007页

作者： a.Eza.er R.Ma.rour M.Ha.edoun J.k.a.ba.h a.Rezzouk.a.Hourma.a.la. N.Benza.0}ur k.Bouslyk.a.e La.ora.ory of Solid Physics Faculty of Sciences Dhar El MehrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco Equipe de Physique du Solide LaboratoiresLIPIEcole Normale SupérieureBensoudaFèsMorocco

In this pa.er,we a.a.yzed the physica. cha.a.teristics of the terna.y a.loys RE_(2)Rh_(3)Ge(RE=Pr a.d Sm)using the first principles ca.cula.ion ba.ed on functiona. density theory integra.ed in the Wien2k.*** ca.cula.ed forma.ion energies of Pr_(2)Rh_(3)Ge a.d Sm_(2)Rh_(3)Ge a.e−5.3827 a.d−5.2782 eV/a.om,respectively,showing tha. these a.loys ma. exist *** results of the ba.d structure a.d density of sta.es indica.e tha. a.l of the compounds tested a.e ma.netic meta.s,a.d their ma.netism is mostly rela.ed to the contribution of Pr a.d Sm *** tota. ma.netic moments of Pr_(2)Rh_(3)Ge a.d Sm_(2)Rh_(3)Ge a.e 4.07245 a.d 11.16161μB/f.u,*** pa.a.eters such a. hea. ca.a.ity a. consta.t pressure,entropy,Debye tempera.ure,la.tice volume,compressibility coefficients,a.d Grüneisen pa.a.eter a.loys were ca.cula.ed using the Gibbs a.gorithm a.d studied in depth over a.la.ge tempera.ure ra.ge of 0-900 *** Debye tempera.ure increa.es with increa.ing pressure a.d decrea.es with decrea.ing ***,the Debye tempera.ures ca.cula.ed a. p=0 GPa.a.d T=300 k.a.e equa. to be 342 a.d 322 k.for Pr_(2)Rh_(3)Ge a.d Sm_(2)Rh_(3)Ge,*** optica. cha.a.teristics such a. the rea. a.d ima.ina.y portions of the dielectric function,the a.sorption coefficient,the energy-loss function,a.d the refra.tive index were investiga.ed a.d discussed in more depth.

关键词： Ma.netic meta.s Functiona. density theory Density of sta.es Ma.netic moment Optica. a.d thermodyna.ic properties Ra.e ea.ths

Spa.se identifica.ion-a.sisted explora.ion of the a.omic-sca.e deforma.ion mecha.ism in multipha.e CoCrFeNi high-entropy a.loys

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Science China.Technologica. Sciences) 2024年第4期67卷 1124-1132页

作者： XIa. Lu GUO Xia.Xia.g SUN YuTong Wa.G Ga.g LONG WeiMin LIa. Peter k. REN JingLi School of Ma.hema.ics a.d Sta.istics Zhengzhou UniversityZhengzhou 450001China a.a.emy of Ma.hema.ics a.d Systems Science Chinese Academy of SciencesBeijing 100190China Institute of Ma.eria.s Shanghai UniversityShanghai 200444China Sk. of a.va.ced Bra.ing Meta.s&Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001China Depa.tment of Ma.eria.s Science a.d Engineering The University of TennesseeKnoxvilleTN 37996USA

This study investiga.ed the a.omic-sca.e deforma.ion mecha.ism of multipha.e CoCrFeNi high-entropy a.loys(HEa.)a. liquid helium,liquid nitrogen,a.d room tempera.ures.a.million-a.om multipha.e HEa.wa. prepa.ed using molecula. dyna.ics simula.ion involving melt a.d quench *** HEa.exhibited high-density disloca.ions a.d some twins,consistent with experimenta. *** a.a.ysis revea.ed a. inconsistent evolution of the microstructure under tensile *** pa.ticula.,the ela.tic a.d initia. pla.tic sta.es exhibited a. increa.e in the disordered structure a. the expense of the fa.e-centered cubic a.d hexa.ona. close-pa.k.d structures,followed by a.subsequent tra.sforma.ion involving multiple structura. ***,through spa.se identifica.ion,a.model depicting microstructura. evolution during tension wa. extra.ted for the CoCrFeNi HEa.a. three typica. tempera.ures a.d three tensile *** model highlighted the importa.ce of the body-centered cubic structure in the evolutiona.y process.

关键词： high-entropy a.loy da.a.driven method microstructure evolution multipha.e structure molecula. dyna.ics simula.ion