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Steady-State Modeling of Heat Transfer on the Recovery System of Condensing Boiler

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Journal of Power and Energy Engineering 2021年第7期9卷 29-40页

作者： Joachim Ntonda frederic Lontsi Francois Njock Bayock Laboratry of Energy Materials Modelisation and Method University of Douala Douala Cameroon Department of Mechanical Engineering ENSET Douala University of Douala Douala Cameroon

The increase of energy production is very important nowadays. It is necessary to improve the performance and efficiency of heat production facilities. The objective is to reduce pollutant emissions and regulate investment costs. One of the solutions is to control fuel and electricity consumption. This article develops a new model of simulation heat diffusion on the recovery system of condensing boiler. The method is based on the first and second thermodynamic systems. The Numerical discrete Model (NDM) was applied using MATLAB to simulate different characteristics of heat transfer in the recovery system. The result shows that the recovery unit can absorb the following temperatures;the range from 88°C to 90.7°C when the length of the tube is between respectively 110 and 111 m. the energy efficiency was between 0.55 and 0.57 which allowed confirming the model. This new model has some advantages such as;the use of an instantaneous calculation time. The heat recovered by the water tank can also serve as preheating different systems. One part of the heat recovered will be accumulated to be used as domestic hot water.

关键词： Heat Recovery Steady-State Numerical Discrete Model

Gravitationally lensed extended sources: the case of QSO RXJ0911

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Research in Astronomy and Astrophysics 2013年第7期13卷 803-814页

作者： Do Thi Hoai Pham Tuyet Nhung Pham Tuan Anh frederic Boone Pierre Darriulat Pham Ngoc Diep Pham Ngoc Dong Nguyen Van Hiep Nguyen Thi Thao VATLY INST179Hoang Quoc VietCau GiayHanoiVietnam IRAP 14avenue Edouard BelinF31400 ToulouseFrance

After a brief reminder of the mechanism of gravitational lensing of ex- tended sources, the particular case of the host galaxy of QSO RXJ0911, a high red-shift （z - 2.8） quadruply imaged quasar, is explored. The non linearity of the problem, together with the proximity of the source to a cusp of the lens inner caustic, has impor-tant consequences on the dependence of the image appearance on the size and shape of the source. Their expected main features and their interpretation in terms of source extension and shape are investigated in a spirit of simplicity and in preparation for the analysis of high sensitivity and spatial resolution images that will soon be within reach with the completion of the Atacama Large Millimeter/submillimeter Array （ALMA）. In particular, the information on source size carded by relative image brightness is dis-cussed. Extension of the results to other types of quadruply imaged quasars is briefly considered.

关键词： gravitational lensing - galaxies: high-redshift

Thin films of binary amorphous Zn-Zr alloys developed by magnetron co-sputtering for the production of degradable coronary stents:A preliminary study

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Bioactive Materials 2018年第4期3卷 385-388页

作者： Nathalie Annonay Fatiha Challali Marie-Noelle Labour Valerie Bockelee A.Garcia-Sanchez Florent Tetard Marie-Paule Besland Philippe Djemia frederic Chaubet Laboratoire de Science des Materiaux et des Procedes UPR CNRS 3407Universite Paris 13Sorbonne-Paris-CiteInstitut Galilee99 av J.B.Clement93430VilletaneuseFrance Laboratory for Vascular Translational Science Inserm U1148Universite Paris 13Universite Paris-DiderotSorbonne-Paris-CiteInstitut Galilee99 av J.B.Clement93430VilletaneuseFrance Institut des Materiaux Jean Rouxel(IMN)UMR CNRS 6502 Universite de Nantes2rue de la HoussiniereB.P.3222944322Nantes Cedex 3France

*** Vascular stents are endo-prostheses that allow the restoration of blood flow in case of obstruction of a vessel.A stent usually consists of a corrosion-resistant metal such as Nitinol,316L steel or a CoCr alloy[1].Many studies have been undertaken for the production of polymer degradable stents[2,3]or metallic stents[4,5]and,among these,devices made of pure zinc or crystallized alloy based on zinc obtained by molding and extrusion are promising in terms of biodegradability,biocompatibility and mechanical properties[6],but also concerning the degradation rate of the stent which should to be effective until arterial remodeling and tissue healing are complete[5].The objective of this preliminary study is the comparison of the degradation in simulated biological medium and the endothelial cytotoxicity of amorphous and crystallized thin ZnZr films according to their composition and *** this work,the thin layers were deposited on silicon substrates by magnetron *** technology is already used to make metal stents[7,8].

关键词： alloy alloys corrosion

Salmonella infection after anterior cruciate ligament reconstruction:A case report

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World Journal of Orthopedics 2021年第4期12卷 246-253页

作者： Thomas Neri Margaux Dehon Elisabeth Botelho-Nevers Celine Cazorla Sven Putnis Remi Philippot frederic Farizon Bertrand Boyer Department of Orthopaedic Surgery University Hospital Centre of Saint-EtienneSaint-Etienne 42000France EA 7424-Inter-University Laboratory of Human Movement Science University Lyon-University Jean Monnet Saint EtienneSaint Etienne 42000France Infectious Diseases Department University Hospital of Saint-EtienneSaint-Etienne 42000France Avon Orthopaedic Centre Southmead HospitalBristolBS105NBUnited Kingdom

BACKGROUND Infections after anterior cruciate ligament reconstruction(ACLR)are *** cases of Salmonella infection have been described to our *** SUMMARY We describe a rare case of Salmonella infection in a 23-year-old patient following an *** patient presented with subacute septic arthritis,26 d after a hamstring autograft *** pathogen,Salmonella enterica typhimurium was isolated by bacteriological sampling of the first arthroscopic *** arthroscopic lavages were required,with intravenous antibiotic therapy for two weeks with cefotaxime and ciprofloxacin,followed by oral antibiotics with amoxicillin and ciprofloxacin for a total duration of three *** approach treated the infection but two years after the septic arthritis,faced with ongoing knee instability due to graft damage,a revision ACLR with a bone-tendon-bone graft was *** the last follow-up,full range of knee motion had been achieved and sports activities *** Infection after ACLR is rare and requires an early diagnosis and management in order to treat the infection and prevent arthritis-related joint cartilage destruction and damage to the graft.

关键词： Knee Anterior cruciate ligament Infection Salmonella Case report

Statistical Study of foF2 Diurnal Variation at Dakar Station from 1971 to 1996:Effect of Geomagnetic Classes of Activity on Seasonal Variation at Solar Minimum and Maximum

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International Journal of Geosciences 2015年第3期6卷 201-208页

作者： Ali Mahamat Nour Ouattara frederic Zerbo Jean Louis Gyebre Aristide Marie frederic Nanema Emmanuel Zougmore Francois Laboratoire de Materiaux et Environnement(LAME) UFR SEA Universite de OuagadougouOuagadougouBurkina Faso Laboratoire de Recherche en Energetique et Meteorologie de l’Espace(LAREME) Universite de KoudougouKoudougouBurkina Faso Institut des Sciences Exactes et Appliquees(ISEA) Universite Polytechnique de Bobo DioulassoBobo DioulassoBurkina Faso Centre National de Recherches Scientifiques et Techniques(CNRST) Institut de Recherches Scientifiques Appliquees et Technologies(IRSAT)OuagadougouBurkina Faso

The statistical study of F2 layer critical frequency at Dakar station from 1971 to 1996 is carried out. This paper shows foF2 statistical diurnal for all geomagnetic activities and all seasons and that during solar maximum and minimum phases. It emerges that foF2 diurnal variation graphs at Dakar station exhibits the different types of foF2 profiles in African EIA regions. The type of profile depends on solar activity, season and solar phase. During solar minimum and under quiet time condition, data show?the signature of a strength electrojet that is coupled with intense counter electrojet in the afternoon. Under disturbed conditions,?mean intense electrojet is observed in winter?during fluctuating and recurrent activities. Intense counter electrojet is seen under fluctuating and shock activities in all seasons coupled with strength electrojet in autumn. In summer?and spring under all geomagnetic activity condition, there is intense counter electrojet. During solar maximum, in summer and spring there is no electrojet under geomagnetic activity conditions.?Winter shows a mean intense electrojet. Winter and autumn are marked by the signature of the reversal electric field.

关键词： foF2 Diurnal Variation Solar Cycle Phases Geomagnetic Activity Classes Seasonal Effects E Region Electric Currents

Right Ventricular Thrombus and Tricuspid Valve Dysfunction in a Patient with Behçet’s Disease

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Case Reports in Clinical Medicine 2020年第10期9卷 319-328页

作者： Federica Valente Christian Motet Stefan Rusu frederic Vandergheynst Department of Cardiology Erasme University Hospital Université Libre de Bruxelles Brussels Belgium Department of Internal Medicine CHU Tivoli Université Libre de Bruxelles Brussels Belgium Pathology Department Erasme University Hospital Université Libre de Bruxelles Brussels Belgium Department of Internal Medicine Erasme University Hospital Université Libre de Bruxelles Brussels Belgium

Background: Behçet’s disease (BD) is a multisystemic, chronic inflammatory disorder with a broad range of manifestations including within the cardiovascular system. Cardiac involvement like intracardiac thrombus (ICT) and valvular involvement in BD are rarely seen entities and often associated with poor prognosis. Case Presentation: We present the case of a young patient with vascular-Behçet diagnosed by the presence of intracardiac thrombus in the right ventricle, unresponsive to medical treatment. Even though the intracardiac lesion was successfully treated by surgical excision, he presented a severe tricuspid dysfunction some years later due to the extension of fibrosis with no surgical therapeutic option. Conclusion: Intracardiac thrombosis is a rare but early manifestation of Behçet’s disease, which is difficult to diagnose and has a poor prognosis.

关键词： Behçet’s Disease Cardiac Involvement Intracardiac Thrombosis Tricuspid Valve Regurgitation Endomyocardial Fibrosis

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中国农业财政政策及其对马达加斯加的启示

中国农业财政政策及其对马达加斯加的启示

作者： DAFITSE ALAIN frederic（阿拉）吉林大学

学位级别：硕士

农业财政政策不仅是国家财政政策的重要内容,更是促进农村社会经济协调发展的财力保障。积极稳健的农业财政政策是促进农业健康发展的有效保证,是提高农民收入的关键。马达加斯加农业财政政策在实施现状、结构设计以及改革发展方面都还... 详细信息

农业财政政策不仅是国家财政政策的重要内容,更是促进农村社会经济协调发展的财力保障。积极稳健的农业财政政策是促进农业健康发展的有效保证,是提高农民收入的关键。马达加斯加农业财政政策在实施现状、结构设计以及改革发展方面都还处于落后阶段,而中国在财政支农方面已经取得了很大成就,两国的农业财政政策值得深入研究。研究中国农业财政政策,从而可以使马达加斯加在农业财政政策方面得到启示,对于优化马达加斯加农业财政支出结构、盘活农业财政资金有很大的借鉴意义。本文依据农业基础地位论和财政投入与农业发展理论,分析了政府财政支持农业对马达加斯加的重要性,将马达加斯加农业、农村现状以及农业财政政策状况,与中国进行了对比,分析了马达加斯加农业财政政策存在的不足,以及中国农业财政政策带给马达加斯加的启示。本文一共分为五个部分,分别阐述了中国与马达加斯加的农业状况和农业财政政策状况。第一章是本文的导论部分,阐述了相关研究综述和论文研究意义与背景;第二章是论文的主体部分,介绍了中国农业资源状况、农业发展状况以及农业和农村经济结构特征,使之与马达加斯加的农业、农村状况进行了对比;第三章介绍了中国农业财政政策的起源、发展和成就;第四章介绍了马达加斯加的农业财政政策状况,农业财政政策存在的问题以及农业在马达加斯加国民经济中的重要性和政府支农的重要意义所在;第五章是最后一章主要分析了中国农业财政政策对马达加斯加的启示及值得马达加斯加借鉴之处;最后是论文的结论部分。

关键词：马达加斯加中国农业财政政策启示

Involvement of toll-like receptor 5 in mouse model of colonic hypersensitivity induced by neonatal maternal separation

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World Journal of Gastroenterology 2022年第29期28卷 3903-3916页

作者： Geoffroy Mallaret Amandine Lashermes Mathieu Meleine Ludivine Boudieu Julie Barbier Youssef Aissouni Agathe Gelot Benoit Chassaing Andrew T Gewirtz Denis Ardid frederic Antonio Carvalho Department of Pharmacology UMR 1107 NeuroDolUniversity of Clermont AuvergneClermont-Ferrand 63000France Department of Microbiology UniversitéParis-SaclayNational Research Institute for AgricultureFood and the EnvironmentAgroParisTechMicalis InstituteJouy-en-Josas 78350France Team“Mucosal Microbiota in Chronic Inflammatory Diseases” INSERM U1016CNRS UMR 8104UniversitéParis CitéParis 75014France Center for Inflammation Institute for Biomedical SciencesGeorgia State UniversityAtlantaGA30033United States Department of Pharmacology INSERM 1107 NeuroDOL/University of Clermont AuvergneClermont-Ferrand 63000France

BACKGROUND Chronic abdominal pain is the most common cause for gastroenterology consultation and is frequently associated with functional gastrointestinal disorders including irritable bowel syndrome and inflammatory bowel disease. These disorders present similar brain/gut/microbiota trialogue alterations, associated with abnormal intestinal permeability, intestinal dysbiosis and colonic hypersensitivity(CHS). Intestinal dysbiosis can alter colon homeostasis leading to abnormal activation of the innate immunity that promotes CHS, perhaps involving the toll-like receptors(TLRs), which play a central role in innate *** To understand the mechanisms between early life event paradigm on intestinal permeability, fecal microbiota composition and CHS development in mice with TLRs expression in *** Maternal separation model(NMS) CHS model, which mimics deleterious events in childhood that can induce a wide range of chronic disorders during adulthood were used. Colonic sensitivity of NMS mice was evaluated by colorectal distension(CRD) coupled with intracolonic pressure variation(IPV) measurement. Fecal microbiota composition was analyzed by 16S rRNA sequencing from weaning to CRD periods. TLR mRNA expression was evaluated in ***, the effect of acute intrarectal instillation of the TLR5 agonist flagellin(FliC) on CHS in adult naive wildtype mice was *** Around 50% of NMS mice exhibited increased intestinal permeability and CHS associated with intestinal dysbiosis, characterized by a significant decrease of species richness, an alteration of the core fecal microbiota and a specific increased relative abundance of flagellated bacteria. Only TLR5mRNA expression was increased in colonocytes of NMS mice with CHS. Acute intrarectal instillation of FliC induced transient increase of IPV, reflecting transient CHS *** Altogether, these data suggest a pathophysiological continuum between intestinal dysbiosis a

关键词： Chronic abdominal pain Colonic hypersensitivity Toll-like receptors Intestinal microbiota Early life events

Genetic parameters of drinking and feeding traits of wean-to-finish pigs under a polymicrobial natural disease challenge

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Journal of Animal Science and Biotechnology 2022年第1期13卷 17-35页

作者： Jian Cheng Austin M.Putz John C.S.Harding Michael K.Dyck frederic Fortin Graham S.Plastow Pig Gen Canada Jack C.M.Dekkers Department of Animal Science Iowa State UniversityAmesIA 50011USA Hendrix Genetics Swine Business UnitBoxmeerThe Netherlands 5831CK Department of Large Animal Clinical Science University of SaskatchewanSaskatoonSK S7N 5A2Canada Department of Agriculture Food and Nutritional ScienceUniversity of AlbertaEdmontonAB T6G 2R3Canada Centre de Developpement du Porc du Quebec Inc. Quebec City G1V 4M6Canada PigGen Canada Research Consortium GuelphOntario N1H4G8Canada

Background:The pork industry faces unprecedented challenges from disease,which increases cost of production and use of antibiotics,and reduces production efficiency,carcass quality,and animal *** solution is to improve the overall resilience of pigs to a broad array of common diseases through genetic *** changes in feeding and drinking are usually the very first clinical signs when animals are exposed to stressors such as *** in feeding and drinking behaviors in diseased pigs may reflect the way they cope with the challenge and,thus,could be used as indicator traits to select for disease *** objectives of this study were to estimate genetic parameters of feeding and drinking traits for wean-to-finish pigs in a natural polymicrobial disease challenge model,to estimate genetic correlations of feeding and drinking traits with growth rate and clinical disease traits,and to develop indicator traits to select for disease ***:In general,drinking traits had moderate to high estimates of heritability,especially average daily water dispensed,duration,and number of visits(0.44 to 0.58).Similar estimates were observed for corresponding feeding traits(0.35 to 0.51).Most genetic correlation estimates among drinking traits were moderate to high(0.30 to 0.92)and higher than among feeding traits(0 to 0.11).Compared to other drinking traits,water intake duration and number of visits had relatively stronger negative genetic correlation estimates with treatment rate and mortality,especially across the challenge nursery and finisher(−0.39 and−0.45 for treatment rate;−0.20 and−0.19 for mortality).Conclusion:Most of the recorded drinking and feeding traits under a severe disease challenge had moderate to high estimates of heritability,especially for feed or water intake duration and number of *** and genetic correlations among the recorded feeding traits under disease were generally low but drinking traits show

关键词： Disease resilience Feeding and drinking behavior Genetic parameters Pigs