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Durability of Lightweight Concrete Using Oil Palm Shell as Aggregates

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Open Journal of Civil Engineering 2021年第1期11卷 1-13页

作者： Yasmine Binta Traore Adamah Messan Kinda Hannawi jean gerard William Prince François Tsobnang Université de Fada N’Gourma/Ecole Supérieure d’Ingénierie (ESI) Fada N’Gourma Burkina Faso Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE) Laboratoire Eco-Matériaux et Habitats Durables (LEMHaD) Ouagadougou Burkina Faso Institut National des Sciences Appliquées de Rennes (INSA-Rennes) Laboratoire de Génie Civil et de Génie Mécanique (LGCGM) Rennes France Centre de Coopération International en Recherche Agronomique pour le Développement (CIRAD) Unité de recherche Biomass Wood Energy and Bioproducts (BioWooEB) Montpellier France

Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over the long term and when it is in aggressive environments. This paper presents the results of studies conducted on the durability of OPS concrete. Water absorption capacity, electrical resistivity and apparent diffusion of chloride ions have been measured on different concrete samples. In addition, the behaviour of OPS concretes to carbonation was studied in an environment rich in carbon dioxide. Results show that OPS concrete has an absorptivity of 0.97 kg/m2·h1/2, an electrical resistivity of 64.37 Ω·m and an apparent diffusion coefficient of chloride ions of 3.84

Experimental Investigations on the Physical and Mechanical Properties of a Lightweight Concrete Using Oil Palm Shell as Coarse Aggregate

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材料科学与工程（中英文A版） 2017年第3期7卷 157-168页

作者： Yasmine Binta TRAORE Adamah MESSAN Kinda HANNAWI jean gerard William PRINCE-AGBODJAN Francois TSOBNANG lnstitut International d'Ingenierie de l'Eau et de l'Environnement (2iE) Laboratoire Eco-Materiaux de Construction (LEMC) Rue de la Science 01 BP 594 Ouagadougou 01 Burkina Faso INSA-Rennes Laboratoire de Gdnie Civil et Genie mecanique (LGCGM) 20 Avenue des Buttes de Coesmes CS 70839 35708 Rennes Cedex 7 France Centre de cooperation International en Recherche Agronomique pour le developpement (CIRAD) UPR Biomasse Energie TA B-42/16 73 rue Jean Francois Breton 34398 Montpellier Cedex 5 France

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预应方混凝土枕单开道岔(下)

铁道建筑 1987年第8期 36-38+27页

作者： jean OECONOMOS gerard CERVI ,焦新卿

2.混凝土枕中的预留孔 (1) 基础设计所有螺纹道钉孔都应位于距混凝土枕中心线55mm的两条线上。混凝土岔枕的间距与tg0.085型道岔木枕的相同。转辙器部分:轨枕垂直于正线的基准轨; 连接部分:沿着轨枕与侧线外轨相交的半角轨枕呈扇形布... 详细信息

2.混凝土枕中的预留孔 (1) 基础设计所有螺纹道钉孔都应位于距混凝土枕中心线55mm的两条线上。混凝土岔枕的间距与tg0.085型道岔木枕的相同。转辙器部分:轨枕垂直于正线的基准轨; 连接部分:沿着轨枕与侧线外轨相交的半角轨枕呈扇形布置; 辙叉及辙叉后端部分:轨枕垂直于辙叉角

关键词：轨枕侧线垫板配件零部件铺设道岔辙叉滑床板混凝土岔枕

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预应力混凝土枕单开道岔(上)

铁道建筑 1987年第7期 34-35页

作者： jean CECONOMOS gerard CERVI ,焦新卿

20多年来,法国国营铁路铺设了混凝土枕线路。在这方面取得的经验及在维修方面获得的成果,为在道岔部分发展混凝土岔枕提供了可能性。 1984年,法国国营铁路铺设了两组混凝土枕单开道岔。

关键词：单开道岔预应力混凝土枕整铸辙叉

Cost-Effective Monitoring of the Fuel Air Equivalence-Ratio with a Lambda Sensor and a Microcontroller in a Downdraft Biomass Gasifier

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Open Journal of Applied Sciences 2024年第2期14卷 545-560页

作者： jean Fidele Nzihou Salou Hamidou Ousmane Zoundi Frederic Ouattara Bila gerard Segda Formation and Research Unit in Sciences and Technologies University Norbert ZONGO Koudougou Burkina-Faso

The operation of biomass treatment devices such as gasifiers is based on the control of key parameters that play an important role in product formation. These include: temperature, excess oxygen, relative humidity and biomass composition. This work focuses on excess oxygen and temperature. Unfortunately, flue gas oxygen analyzers are expensive and not accessible to small industries. However, the equivalence ratio is linked to excess oxygen and has the advantage of not depending on biomass composition. This study therefore focuses on the design and development of a device for controlling this equivalence ratio by measuring oxygen concentration using a self-propelled Lambda probe, and a system for monitoring this equivalence ratio using an Arduino Uno 3 microcontroller. The temperature is recorded with an accuracy of ±1.5°C. For a heating time of 10 minutes, the response time to temperature change is around 3 seconds, which is sufficient for the device to function properly. This simple device is an efficient and cost-effective means of checking the equivalence ratio.

关键词： Equivalence Ratio Biomass Gasification Lambda Sensor Microcontroller C++

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阻燃剂多尺度结构设计与绿色火安全材料研发

厦门大学学报（自然科学版） 2021年第2期60卷 247-262页

作者：许一婷王华进王子超曾碧榕袁丛辉卢伟 jean-Francois gerard 戴李宗厦门大学材料学院福建省防火阻燃材料重点实验室福建厦门361005 海洋涂料国家重点实验室海洋化工研究院有限公司山东青岛266071 厦门大平工贸有限公司福建厦门361004 Ingénierie des Matériaux Polymères-UMR CNRS #5223 INSA de Lyon69621 Villeurbanne Cedex (France)

通用聚合物具有易燃性,遇火迅速燃烧并释放大量有毒烟气,严重威胁着人类的生命财产安全.因此,绿色火安全材料的研发是符合国家战略发展需求的重要课题之一.运用多元素杂化改性、超分子自组装等前沿新方法、新技术,从不同尺度对无卤阻燃... 详细信息

通用聚合物具有易燃性,遇火迅速燃烧并释放大量有毒烟气,严重威胁着人类的生命财产安全.因此,绿色火安全材料的研发是符合国家战略发展需求的重要课题之一.运用多元素杂化改性、超分子自组装等前沿新方法、新技术,从不同尺度对无卤阻燃剂的结构进行设计,可以实现对高性能聚合物材料的阻燃改性,构筑绿色火安全材料.本文主要介绍厦门大学及其合作单位在防火阻燃材料领域的研究工作,包括分子水平上的P/N阻燃体系与多面体低聚倍半硅氧烷(POSS)基多元素阻燃体系设计、纳米尺度的无机材料表面有机功能化阻燃剂体系设计等方面的研究,以及在环氧树脂、聚氨酯发泡材料、防火涂料的应用研究,并提出防火阻燃材料的发展趋势.

关键词：防火阻燃材料多尺度结构设计多元素杂化有机/无机纳米复合材料

Tailoring the properties of quantum dot-micropillars by ultrafast optical injection of free charge carriers

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Light(Science & Applications) 2021年第11期10卷 2083-2097页

作者： Emanuel Peinke Tobias Sattler Guilherme M.Torelly Patricia L.Souza Sylvain Perret Joel Bleuse Julien Claudon Willem L.Vos jean-Michel gerard UniversitéGrenoble Alpes CEAIRIG-PHELIQS“Nanophysique et Semiconducteurs”groupF-38000GrenobleFrance LabSem-CETUC Pontificia Universidade Catolica do Rio de JaneiroRio de Janeiro22451-900Brazil Complex Photonic Systems(COPS) MESA+Institute for NanotechnologyUniversity of TwenteP.O.Box 2177500 AEEnschedethe Netherlands

We review recent studies of cavity switching induced by the optical injection of free carriers in micropillar cavities containing quantum *** the quantum dots as a broadband internal light source and a streak camera as detector,we track the resonance frequencies for a large set of modes with picosecond time *** report a record-fast switch-on time constant(1.5 ps)and observe major transient modifications of the modal structure of the micropillar on the 10 ps time scale:mode crossings are induced by a focused symmetric injection of free carriers,while a lifting of several mode degeneracies is observed when off-axis injection breaks the rotational symmetry of the *** show theoretically and experimentally that cavity switching can be used to tailor the dynamic properties of the coupled QD-cavity *** report the generation of ultrashort spontaneous emission pulses(as short as 6 ps duration)by a collection of frequency-selected QDs in a switched pillar *** pulses display a very small coherence length,attractive for ultrafast speckle-free ***,the control of QD-mode coupling on the 10 ps time scale establishes cavity switching as an appealing resource for quantum photonics.

关键词： lifting injection cavity

Experience on the Management of Priapism at the Yaounde Central Hospital

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Open Journal of Urology 2024年第4期14卷 244-251页

作者： Philip Fernandez Owon’Abessolo jean Cédric Fouda Armel Essomba Cécile Etobe Achille Kpanou Yellem Yvon gerard Beling Abanda Bright Awondo-Che Milama Steves Ndang Ngou Department of Surgery and Specialties Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Urology Service Yaound&#233 Central Hospital Yaound&#233 Cameroon Department of Surgery and Specialty Faculty of Medicine and Biomedical Sciences University of Yaound&#233 1 Yaound&#233 Cameroon Department of Urology University of Health Sciences Owendo Gabon

Introduction: Priapism is a urological emergency defined as a prolonged penile erection for more than 6 hours, painful and sustained, occurring without any sexual stimulation. The diagnosis is essentially clinical. However, the management is often late because of the delay in consultation, which is characteristic in our context. The purpose of our study is to describe the clinical and therapeutic aspects of patients who presented with priapism at the Yaoundé Central Hospital as well as to propose a present synthesis concerning the management of priapism. Methodology: We conducted a descriptive cross-sectional study with a retrospective recruitment method in the urology department of the YCH. It extended over a period of 6 months from January 2022 to June 2022. We reviewed the files of patients seen within a period spanning 10 years from January 1st, 2011 to January 31st, December 2021. The study population consisted of patients who had been hospitalized and treated for priapism. We carried out consecutive and non-exhaustive sampling. Results: During the study, we collected data from the medical files of 13 patients. The median age was 25 years, with extremes of 12 and 82 years. Most of the patients were between 20 and 30 years old (38.5%). Most of the patients were single (69.2%). Sickle cell disease was the main comorbidity encountered during the study (76.9%). The median time from onset of symptoms to consultation was 10 [6 - 20.5] hours, with extremes of 1 and 264 hours. All patients presented with painful penile erection (100%). There was concomitant multifocal pain in 38.5% of cases suggestive of vaso-occlusive crises (VOC). The symptoms occurred in a non-traumatic context in the majority of cases (92.3%). The T-shunt was the most used surgical technique (84.6%). The median duration of surgery was 36 [35 - 40] minutes with extremes of 25 and 60 minutes, the majority being operated in less than 45 minutes (84.6%). The frequency of postopera

关键词： Priapism Treatment Experience

Epidemiological profiles of human immunodeficiency virus and hepatitis C virus infections in Malian women:Risk factors and relevance of disparities

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World Journal of Hepatology 2013年第4期5卷 196-205页

作者： Nouhoum Bouare Andre Gothot jean Delwaide Sebastien Bontems Dolores Vaira Laurence Seidel Paul gerard Christiane gerard Department of Clinical Biology Laboratory HematologyImmuno-Hematology and AIDS Reference Laboratory B35Centre Hospitalier UniversitaireUniversité de Liège4000 LiègeBelgium Department of Hepatology and Gastroenterology Centre Hospitalier UniversitaireUniversité de Liège4000 LiègeBelgium Department of Public Health(Biostatistics) Centre Hospitalier UniversitaireUniversité de Liège4000 LiègeBelgium Institute of Mathematics Université de Liège4000 LiègeBelgium

AIM:To document the epidemiologic patterns and risk factors of human immunodeficiency virus(HIV)and hepatitis C virus(HCV)infections in Mali in order to develop prevention means for both ***:Two prospective studies were conducted in Bamako in 2009 among 1000 pregnant women(i.e.,young women)who consulted six reference health centers,and in 2010,among 231 older women who attended general practice in two *** tests and molecular analysis(performed only for HCV)were used to quantify the frequencies of both *** data were collected from patients recruited through a *** risk factors of both diseases were identified by univariate and multivariate ***:HCV seroprevalence was 0.2% for young and 6.5% for older *** prevalence was similar in both populations(4.1% vs 6.1%).In older women,the analysis of risk factors highlighted an association between HCV infection and episodes of hospitalization(P < 0.01).The study did not show an association between HIV infection and the variables such as hospitalization,transfusion,tattoo,dental care,and endoscopy.A significant decrease of HIV seroprevalence was detected in young women who used condoms for contraception more than for other purposes(P < 0.01).By contrast,HIV seroprevalence was significantly increased in young women using condoms mainly to prevent sexual infections rather than for contraception(P < 0.01).No HCV/HIV coinfection was detected in our ***:Risk factors and epidemiologic data of HIV and HCV as well as the absence of co-infection strongly suggest epidemiological disparities between these diseases.

关键词： Hepatitis C virus Human immunodeficiency virus Epidemiology Risk factors Women Mali Bamako