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A Review on t.chnologies for t.e Use of CO2 as a Working Fluid in Refrigerat.on and Power Cycles

Energy and Power Engineering 2024年第6期16卷 217-256页

作者： orelien t. boupd. Hyacint.e D. t.ssemo Isidore B. Nkounda Fongang Francklin G. Nyami Frederic Lont.i t.omas Djiako Laborat.ry of Energy Higher National Polytechnic School of Douala University of Douala Douala Cameroon Inst.t.t.Ucac-Icam Douala Cameroon Depart.ent.of Energy and Mechanical Engineering ISTA-IUG University of Ngaoundere Ngaoundere Cameroon

t.e use of carbon dioxide as a working fluid has been t.e subject.of ext.nsive st.dies in recent.years, part.cularly in t.e field of refrigerat.on where it.is at.t.e heart.of research t. replace CFC and HCFC. It. t.ermodynamic propert.es make it.a fluid of choice in t.e efficient.use of energy at.low and medium t.mperat.res in engine cycles. However, t.e performance of t.anscrit.cal CO2 cycles weakens under high t.mperat.re and pressure condit.ons, especially in refrigerat.on syst.ms;On t.e ot.er hand, t.is disadvant.ge becomes rat.er int.rest.ng in engine cycles where CO2 can be used as an alt.rnat.ve t. t.e organic working fluid in small and medium-sized elect.ical syst.ms for low qualit. or wast. heat.sources. In order t. improve t.e performance of syst.ms operat.ng wit. CO2 in t.e field of refrigerat.on and elect.icit. product.on, research has made it.possible t. develop several concept., of which t.is art.cle deals wit. a review of t.e st.t. of t.e art. followed by analyzes in-dept. and crit.cal of t.e various development. t. t.e most.recent.modificat.ons in t.ese fields. Det.iled discussions on t.e performance and t.chnical charact.rist.cs of t.e different.evolut.ons are also highlight.d as well as t.e fact.rs affect.ng t.e overall performance of t.e syst.ms st.died. Finally, perspect.ves on t.e fut.re development.of t.e use of CO2 in t.ese different.cycles are present.d.

关键词： Refrigerat.on Cycle Power Cycle Syst.m Performance t.anscrit.cal CO2 Cycles Working Fluid

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Polyparasit.sm wit. Schist.soma haemat.bium,Plasmodium and soil-t.ansmit.ed helmint.s in school-aged children in Muyuka-Camero on following implement.t.on ofc ont.ol measures:a cross sect.onal st.dy

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Infect.ous Diseases of Povert. 2021年第1期10卷 100-101页

作者： Irene Ule Ngole Sumbele Ofon Vit.lis Ot.a orelien Sylvain Mt.pi Bopda Calvin Bisong Ebai Helen KuoKuo Kimbi t.eresa Nkuo-Aknjif Depart.ent.of Zoology and Animal Physiology University of BueaBueaCameroon 不详

Background:Despit. t.e ubiquit. of polyparasit.sm,it. healt. impact. have been inadequat.ly *** aim of t.is st.dy was t. det.rmine t.e prevalence and det.rminant. of polyparasit.sm wit. Schist.soma haemat.bium,Plasmodium and soil-t.ansmit.ed helmint.s(St.)following sust.ined cont.ol measures,as well as evaluat. t.e out.omes and clinical correlat.s of infect.on in school-aged children(SAC)living in t.e schist.somiasis endemic focus of ***:In a cross-sect.onal st.dy,urine,blood and st.ol samples were each collect.d from SAC(4-14 years)select.d at.random bet.een March and June *** in urine was det.ct.d using reagent.st.ip and *** ova by filt.at.on/microscopy *** was det.ct.d using Giemsa-st.ined blood films and complet. blood count.was obt.ined using an aut.-haemat.logy *** in st.ol was det.ct.d by t.e Kat.-Kat. *** and cont.nuous variables were compared as required,Kappa value est.mat.d and t.e adjust.d odds rat.o(aOR)in t.e mult.variat. analysis was used t. evaluat. associat.on of t.e risk fact.rs wit. infect.on.

关键词： Polyparasit.sm School-age children Schist.soma haemat.bium Plasmodium Soil-t.ansmit.ed helmint.s Morbidit. Risk fact.r Cameroon

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