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A review on Technologies for the Use of CO2 as a Working Fluid in refrigeration and Power Cycles

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

作者： Orelien T. b.upda Hyacinthe D. Tessemo isid.re b. nkound. fongang Francklin G. Nyami Frederic Lontsi Thomas Djiako Lab.ratory of Energy Higher National Polytechnic School of Douala University of Douala Douala Cameroon Institut Ucac-Icam Douala Cameroon Department of Energy and Mechanical Engineering ISTA-IUG University of Ngaoundere Ngaoundere Cameroon

The use of carb.n dioxide as a working fluid has b.en the sub.ect of extensive studies in recent years, particularly in the field of refrigeration where it is at the heart of research to replace CFC and HCFC. Its thermodynamic properties make it a fluid of choice in the efficient use of energy at low and medium temperatures in engine cycles. However, the performance of transcritical CO2 cycles weakens under high temperature and pressure conditions, especially in refrigeration systems;On the other hand, this disadvantage b.comes rather interesting in engine cycles where CO2 can b. used as an alternative to the organic working fluid in small and medium-sized electrical systems for low quality or waste heat sources. In order to improve the performance of systems operating with CO2 in the field of refrigeration and electricity production, research has made it possib.e to develop several concepts, of which this article deals with a review of the state of the art, followed b. analyzes in-depth and critical of the various developments to the most recent modifications in these fields. Detailed discussions on the performance and technical characteristics of the different evolutions are also highlighted as well as the factors affecting the overall performance of the systems studied. Finally, perspectives on the future development of the use of CO2 in these different cycles are presented.

关键词： refrigeration Cycle Power Cycle System Performance Transcritical CO2 Cycles Working Fluid

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A review on Technologies for the Use of CO2 as a Working Fluid in refrigeration and Power Cycles

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Energy and Power Engineering（能源与动力工程） 2024年第6期 217页

作者： Orelien T.b.upda Hyacinthe D.Tessemo isid.re b.nkound. fongang Francklin G.Nyami Frederic Lontsi Thomas Djiako

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Synthesis,Urease Inhib.tion and Molecular Modelling Studies of Novel Derivatives of the Naturally Occurring b.Amyrenone

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Natural Products and b.oprospecting 2019年第1期9卷 49-59页

作者： Jean J.K.b.nkeu Hira Sattar Yannick S.F.fongang Syeda W.Muhammadi Conrad V.Simob.n Fidele Ntie-Kang Guy R.T.Feuya Marthe A.T.Tchuenmogne Mehreen Lateef b.uno N.Lenta Muhammad S.Ali Augustin S.Ngouela Department of Chemistry Faculty of ScienceThe University of BamendaP.O.Box 39BambiliCameroon International Center for Chemical and b.ological Sciences University of KarachiKarachi 75270Pakistan Department of Chemistry Higher Teacher Training CollegeUniversity of MarouaP.O.Box 55MarouaCameroon Department of Pharmaceutical Chemistry Martin-Luther University of Halle-WittenbergWolfgang-Langenbeck-Str.406120 Halle(Saale)Germany Department of Chemistry Faculty of ScienceUniversity of BueaP.O.Box 63BueaCameroon Department of Chemistry Faculty of ScienceScientific and Technical University of MasukuBox 943FrancevilleGabon Department of Chemistry Faculty of ScienceUniversity of Yaounde´IP.O.Box 812Yaounde´Cameroon Multi-Disciplinary research Lab.ratory(MDRL) Bahria University Medical and Dental CollegeBahria UniversityKarachiPakistan Department of Chemistry Higher Teacher Training CollegeUniversity of Yaounde´IP.O.Box 47Yaounde´Cameroon

Urease enzyme(UE)has b.en reported to b. a potent virulence factor for Helicob.cter pylori(HP)b.cteria indicated to b. responsib.e for various gastrointestinal ***,the spread of HP,currently regarded b. the World Health Organization as a class 1 carcinogen,could b. b.tter controlled b. targeting *** is in this line that we have synthesized three new derivatives(2–4)of the naturally occurring olean-12-en-3-one(1),which was previously isolated from the figs of Ficus vallis-choudae Delile(Moraceae).Among the synthesized compounds,3 and 4 contain an indole *** structures were unamb.guously assigned b. spectroscopic and spectrometric techniques(1D-NMR,2D-NMR and MS).The starting material and the synthesized compounds were screened for UE inhib.tion activity,and showed significant activities with IC50 values ranging from 14.5 to 24.6 lM,with compound(1)b.ing the most potent as compared to the positive control thiourea(IC50=21.6 lM).Amongst the synthetic derivatives,compound 4 was the most potent(IC50-=17.9 lM),while the others showed activities close to that of the *** addition,molecular docking study of target compounds 2–4 was performed in an attempt to explore their b.nding mode for the design of more potent UE inhib.tors.

关键词： Helicob.cter pylori Urease inhib.tion Docking Olean-12-en-3-one derivatives

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Control of the Dust Vertical Distrib.tion over Western Africa b. Convection and Scavenging

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Journal of Atmospheric Science research 2024年第1期7卷 19-39页

作者： H.Senghor R.Pilon b.Diallo J.Escrib.no F.Hourdin J.Y.Grandpeix O.b.ucher M.Gueye A.T.Gaye E.Machu National Agency of Civil Aviation and Meteorology PO BOX 8184Senegal Lab.ratory for Atmospheric-Oceanic Physics-Simeon fongang Cheikh Anta Diop UniversityDakar10700Senegal Lab.ratory of Dynamic Meteorology(LMD) CNRS/IPSL/UMPCParis75231France Atmospheric Composition Group Barcelona Supercomputing Center(BSC)Barcelona08034Spain Spatial and Physical Oceanography Lab.ratory(LOPS) Brest UniversityCNRSIRDPlouzane29280France Department of Mathematics and Computer Science University of Sine Saloum El Hadj Ibrahima NiassePO BOX 55KaolackSenegal

Saharan dust represents more than 50%of the total desert dust emitted around the glob. and its radiative effect significantly affects the atmospheric circulation at a continental *** studies on dust vertical distrib.tion and the Saharan Air Layer(SAL)showed some shortcomings that could b. attrib.ted to imperfect representation of the effects of deep convection and *** authors investigate here the role of deep convective transport and scavenging on the vertical distrib.tion of mineral dust over Western *** multi-year(2006-2010)simulations performed with the variab.e-resolution(zoomed)version of the LMDZ climate *** are compared with aerosol amounts recorded b. the Aerosol Rob.tic Network(AERONET)and with vertical profiles of the Cloud-Aerosol Lidar with Orthogonal Polarization(CALIOP)*** allows a thorough examination of the respective roles of deep convective transport,convective and stratiform scavenging,b.undary layer transport,and advection processes on the vertical mineral dust distrib.tion over Western *** comparison of simulated dust Aerosol Optical Depth(AOD)and distrib.tion with measurements suggest that scavenging in deep convection and sub.equent re-evaporation of dusty rainfall in the lower troposphere are critical processes for explaining the vertical distrib.tion of desert *** processes play a key role in maintaining a well-defined dust layer with a sharp transition at the top of the SAL and in estab.ishing the seasonal cycle of dust *** vertical distrib.tion is further reshaped offshore in the Inter-Tropical Convergence Zone(ITCZ)over the Atlantic Ocean b. marine b.undary layer turb.lent and convective transport and wet deposition at the surface.

关键词： Dust Vertical distrib.tion Sahara Sahel West Africa Climate model Convection Scavenging ITCZ

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