检索结果-南通市图书馆

Temporo-spatial dynamics and behavioural patterns of 2012 cholera epidemic in the African mega-city of Conakry,Guinea

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2018年第1期7卷 145-154页

作者： Alexandre Blake Veronique Sarr Keita Delphine Sauvageot Mamadou Saliou Berthe Marie Njanpop Fode Sory Bertrand Sudre Koivogui lamine Martin Mengel Bradford DGessner Keita Sakoba Agence de Medecine Préventive ParisFrance Division Prevention et Lutte contre la Maladie(DPLM) Ministere de la santéPublique et de l’Hygiene Publique ConakryConakryGuinea Institut National de Sante Publique(INSP) ConakryGuinea Franche-Comtéuniversity(UMR 6249 chrono-environnement) BesançonFrance.

Background:Cholera is endemic in Guinea,having suffered consecutive outbreaks from 2004 to 2008 followed by a lull until the 2012 *** we describe the temporal-spatial and behavioural characteristics of cholera cases in Conakry during a three-year period,including the large-scale 2012 ***:We used the national and African Cholera Surveillance Network(Africhol)surveillance data collected from every cholera treatment centre in Conakry city from August 2011 to December *** prevalence of suspect and confirmed cholera cases,the case fatality ratio(CFR),and the factors associated with suspected cholera were described according to three periods:pre-epidemic(A),epidemic 2012(B)and post epidemic(C).Weekly attack rates and temporal-spatial clustering were calculated at municipality level for period *** was confirmed by culture at the cholera national reference ***:A total of 4559 suspect cases were reported:66,4437,and 66 suspect cases in periods A,B and C,*** the 204 suspect cases with culture results available,6%,60%,and 70%were confirmed in periods A,B,and C,*** 0.3%,the CFR was significantly lower in period B than in periods A(7.6%)and C(7.1%).The overall attack rate was 0.28%in period B,ranging from 0.17%to 0.31%across ***,a cluster of cases was identified in two districts in the northern part of *** 14%,rice water stools were less frequent in period A than in period B and C(78%and 84%).Dehydration(31%vs 94%and 89%)and coma(0.4%vs 3.1%and 2.9%)were lower during period B than in periods A and *** treatment of drinking water was less frequent in period A,while there were more reports of recent travel in period ***:The epidemic dynamic and the sociological description of suspect cases before,during,and after the large-scale epidemic revealed that the Vibrio cholerae was already present before the ***,it appeared that infected individuals react

关键词： Cholera Space-time clustering Guinea

Child’s Cardiopathies at the Hospital De La Paix in Ziguinchor (Senegal)

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 Journal of Epidemiology 2022年第1期12卷 50-56页

作者： Simon Joël Manga Sena Laurenda Houngbeme Mohamed Leye lamine Thiam Sidy lamine Sy Quinta Indafa Te Cardiology Department Hospital De La Paix Assane Seck University of Ziguinchor Ziguinchor Sénégal Paediatric Department Hospital De La Paix Assane Seck University of Ziguinchor Ziguinchor Sénégal Cardiology Department Regional Hospital of Mbour Thiès University Thies Sénégal Cardiologie Department Fann National University Center Dakar Sénégal

Introduction: Childhood heart disease consists of congenital and acquired heart disease. The aim of this study was to describe the epidemiological profile and the clinical and aetiological characteristics of childhood heart disease at the H?pital de la Paix in Ziguinchor. Method: This was a retrospective study from 1 January 2016 to 1 June 2020 in the cardiology and paediatrics departments of the H?pital de la Paix in Ziguinchor. We included in the study all patients aged 0 - 18 years, hospitalised with heart disease confirmed by cardiac ultrasound. Results: In total, we included 57 patients in the study. The hospital prevalence was 1.6%. The average age was 67.85 ± 65 months. The predominance was male with a sex ratio of 0.96. The majority of mothers (50%) were between 15 and 30 years old. In our study, 8.85% of patients had a history of previous angina. Trisomy 21 was present in 12.35% of our patients. Severe acute malnutrition was found in 21.05% of cases. Lower limb oedema (82.4%) and dyspnoea (59.6%) were the most frequent clinical signs. On cardiac ultrasound, 52.6% of patients had congenital heart disease and 47.4% of patients had acquired heart disease. Ventricular septal defect (33.33%) was the most common congenital heart disease. Among the acquired heart diseases, mitral insufficiency predominated with 70.8% of cases. Infective endocarditis was the main complication observed. Management was mainly drug-based with diuretics and ACE inhibitors. No patient had undergone surgery. The in-hospital evolution was favourable in 85.9% of cases and the mortality rate was 10.5%. Conclusion: Our study showed that congenital heart disease was more frequent than acquired heart disease and that management, particularly surgery, was lacking.

关键词： Heart Disease Child Ziguinchor De La Paix Hospital

城市形态比较分析：南京和阿尔及尔城市形态及未来前景

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

城市形态比较分析：南京和阿尔及尔城市形态及未来前景

作者： CHEDDAH Mohamed lamine 东南大学

学位级别：硕士

城市的快速扩张是当今城市发展面临主要挑战之一。这种增长如果不受控制和引导,极有可能对社会、经济、环境等产生极大地负面影响。城市扩张是一种普遍现象,在非洲和亚洲大陆尤其明显。然而,这种扩张过于急速,会对就业、住房、能源、基... 详细信息

城市的快速扩张是当今城市发展面临主要挑战之一。这种增长如果不受控制和引导,极有可能对社会、经济、环境等产生极大地负面影响。城市扩张是一种普遍现象,在非洲和亚洲大陆尤其明显。然而,这种扩张过于急速,会对就业、住房、能源、基础设施等方面带来一些挑战,比如城市贫困人口增加、贫民窟扩大、城市环境恶化等问题。本文对阿尔及尔市与南京市的城市形态进行了比较分析,重点比较了两座城市的城市形态演变过程,分析了它们的空间结构与城市面临的主要城市问题间的关系。除此之外,本文还探索了两个城市空间结构的相似性和差异性,以便对它们的增长类型和程度进行更加准确的分析。本文运用的技术方法主要为定性和定量相结合的方法,还结合多种形态学方法,如历史地理、空间句法、类型形态学、Cellular automata(CA)等,多角度的分析阿尔及尔和南京正在面临的城市问题。研究结果表明,阿尔及尔市和南京市所经历的不同事件是导致各自空间结构不断演变的主要原因。阿尔及尔的城市形态和空间结构在历史上保持相对稳定,干预措施较少;而南京的城市形态和空间结构则处于不断变化之中。阿尔及尔一九八零年扩张开始起步。而南京市的快速扩张起步较晚,开始于二十一世纪初。推动两城市快速扩张的主要因素不同,对于南京来说,经济和人口的增长是两个主要因素;对于阿尔及尔来说,人口城市化、交通设施的发展、政策和战略规划主要因素。通过对阿尔及尔市城市空间结构的分析可知,城市有机交通网络的可达性相对于南京较低,这种脆弱的空间结构体现在阿尔及尔市严重的交通拥堵中。尽管南京的空间结构优于阿尔及尔,但其城市的可行走性和渗透性,仍然是城市规划中所面临的一个重大挑战。目前的空间结构和创建大型街区的想法,将鼓励人们购买更多的汽车,从而消耗更多的能源。最后,对2030年城市扩张的预测表明,阿尔及尔的空间结构将更加分散,城市扩张将主要发生在城市周边的郊区。而南京的城市扩张将一直持续,并占用更多的土地。

关键词：城市扩张城市形态空间分析阿尔及尔市南京市

Development of a Dynamic Modulus Prediction Model for Hot Mixture Asphalt and Study of the Impact of Aggregate Type and Its Electrochemical Properties

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Open Journal of Civil Engineering 2020年第3期10卷 213-225页

作者： Mouhamed lamine Chérif Aidara Makhaly Ba Alan Carter UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal Ecole de Technologie Supérieure (ETS) Director of Pavement Bituminous Materials Laboratory (LCMB) Montréal Canada

The most famous model known in prediction of dynamic modulus for asphalt concretes is the Witczak and Hirsh models. These models didn’t use the mineralogical and chemical properties of aggregates. Witczak models used the passing or refusal percentage to sieve diameters and Hirsh model used the volumetric analysis. All models developed until now considered that the aggregates were geotechnical conforming to standards. In this study the first mineralogical and chemical properties were considered through the percentage of silica in the rock source of aggregates and the electric aggregate particles charge zeta. Dynamic modulus values used for regression process are determined from complex modulus test on nine asphalt concretes mix designed with aggregate types (basalt of Diack, quartzite of Bakel and Limestone of Bandia). Between Twelve initial inputs, the statistical regression by exclusion process keeps only seven parameters as input for the model. The mineralogical model showed good accuracy with R2 equal to 0.09. The student test on the model parameters showed that all the parameters included in the model were meaningful with good p inferior to 0.05. The Fisher test on the model showed the same result. The analysis of the sensitivity of the mineralogical model to zeta potential showed that the dynamic modulus increases with the positive zeta-potentials and decrease

关键词： Dynamic Modulus Mineralogical Basalt of Diack Quartzite of Bakel Limestone of Bandia Zeta Potential Silica

Impact of Intrinsic Properties of Aggregate and Volumetric Properties of Hot Mixture Asphalt (HMA) in the Influence of the Resistance to Rutting

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 Journal of Civil Engineering 2020年第3期10卷 187-194页

Several studies show that properties of Hot Mixture Asphalt (HMA) mix design materials, aggregate gradation and volumetric properties had an influence on their resistance to rutting. However, these properties do not impact in the same way this performance. For a given aggregate type, an infinity aggregate gradation type can be observed, and for each type of HMA several types of bituminous binder can be used. This article aims to measure the evolution of resistance to rutting according to the three main classes of National Cooperative Highway Research Program (NCHRP) aggregate gradation (dense-graded, fine-graded and coarse-graded). To this end, a study was conducted on the measurement of rutting resistance for eight bituminous mixtures manufactured with two bitumen types and two types of manufacturing aggregates. The results showed that there is a priority order of these different parameters on the influence of the resistance to rutting. This highlights a competition between the properties of aggregate and type of granular skeleton. Indeed, for the same type of aggregate, asphalt binder type first impacts resistance to rutting of the HMA followed by aggregate gradation, volumetric properties of the mix and finally by the angularity of the aggregates. However, this order cannot be fixed and can depend of the intensity of each parameter.

关键词： Aggregate Gradation HMA Rutting Basalt Quartzite

Adsorption of rare earth elements onto diatomite M45:Experimental investigations and modeling with statistical physics theory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第11期41卷 1805-1811,I0006页

作者： Fatma Dhaouadi Guilherme L.Dotto Julien Vieillard Diana Pinto Luis F.O.Silva Éder C.Lima Mu Naushad Fatma Aouaini Samia Nasr Adrián Bonilla-Petriciolet Abdelmottaleb Ben lamine Laboratory of Quantum and Statistical Physics LR18ES18Faculty of Sciences of MonastirMonastir UniversityMonastirTunisia Research Group on Adsorptive and Catalytic Process Engineering(ENGEPAC) Federal University of Santa MariaAv.Roraima1000-797105–900Santa MariaRSBrazil NormandieUniversité UNIROUENINSA RouenCNRSCOBRA(UMR 6014)27000EvreuxFrance Universidad De La Costa Calle 58#55-66080002BarranquillaAtlánticoColombia Advanced Materials Research Chair Department of ChemistryCollege of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Department of Chemistry College of ScienceBuilding#5King Saud UniversityRiyadhSaudi Arabia Department of Physics College of SciencePrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityAbha61413P.O.Box 9004Saudi Arabia Chemistry Department Faculty of ScienceKing Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia Instituto Tecnológico de Aguascalientes 20256AguascalientesMexico

The separation of rare earth elements using diatomite M45 from aqueous solutions was *** experimental isotherms for the adsorption of trivalent lanthanum,cerium,and neodymium cations on this adsorbent were quantified under strongly acidic conditions(pH 2)at 298-328 *** adsorption equilibria of these earth elements were analyzed using two statistical physics models(homogeneous and heterogeneous monolayer models).The results show that the adsorption of these ions implies a multiionic mechanism,which is ***-containing functional groups are responsible for the adsorption of these rare-earth elements on the diatomite surface.A heterogeneous statistical physics model confirms that two Si-based functional groups participate in the separation of these *** calculated adsorption capacities at saturation follow the order:neodymium>cerium>*** interaction energies range from 28600 to 40100 J/mol,indicating physical adsorption on diatomite *** study demonstrates that diatomite M45 is a promising separation medium that can be used for the recovery of REEs dissolved in aqueous solutions via adsorption.

关键词： Lanthanum Cerium Neodymium Adsorption Diatomite M45 Statistical physics model

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

移动自组网络路由协议性能分析

移动自组网络路由协议性能分析

作者： Mohamed lamine TOURE 中南大学

学位级别：硕士

随着科学技术地发展,通信技术面临着许多困难,尤其是在安全、科学研究及商务服务等重要领域中面临着很大的挑战。本文主要研究移动自组网络中路由协议的性能分析。移动自组网是计算机通信中一个新的概念。用户可以通过移动自组网这种... 详细信息

随着科学技术地发展,通信技术面临着许多困难,尤其是在安全、科学研究及商务服务等重要领域中面临着很大的挑战。本文主要研究移动自组网络中路由协议的性能分析。移动自组网是计算机通信中一个新的概念。用户可以通过移动自组网这种临时和无中心管理的网络互相通信。每个节点在网络中即作为主机又作为路由器,它可为其它节点转发数据包,所以需要一个路由协议实现数据包的转发。本文介绍和分析了Dynamic Source Routing(DSR),Ad hoe On-Demand Vector(AODV)及其它协议。我们需要根据移动自组网络具体情况和协议自身特点来选择合适的路由协议.通过使用一些标准来评价路由协议的性能,将移动自组网络中的路由协议分为两大部分(简单情况和复杂情况),不同类型协议适应于具体不同的网络。本文分析了用来转发数据与交叉点通信工作点的位置、节点信号传输的辐射区域及一些数学方程.通过Visual Basic编程实现了计算中转工作点的位置和数目,并给出了模拟分析结果。同时使用Java编程语言实现了动态源路由协议(DSR),通过采用Socket(输入/输出)发送和接收消息的方法模拟分析了DSR协议。最后,论文探讨了应用GloMoSim分析网络性能,论文中给出了不同协议在不同网络环境下的应用效果。论文最后给出了移动自组网络中的主要研究方向和进步的研究工作。

关键词： Ad hoc网络路由协议无线网络移动环境 GloMoSim

Study of the Impact of Grid Disconnections on the Production of a Photovoltaic Solar Power Plant: Case of Diamniadio Power Plant

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Journal of Power and Energy Engineering 2023年第6期11卷 16-25页

作者： Amadou Ndiaye Mohamed Cherif Aidara Amy Mbaye Mamadou lamine Ndiaye Laboratoire Eau-Energie-Environnement-Procédés Industriels (L3EPI) Ecole Supérieure Polytechnique Université Cheikh Anta Diop (UCAD) Dakar Senegal

Today, renewable energy projects connected to the interconnected network, with powers of the order of tens of megawatts, are more and more numerous in sub-Saharan Africa. And financing these investments requires a reliable amortization schedule. In the context of photovoltaic systems connected to the interconnected electricity grid, the quintessence of damping is the amount of energy injected into the grid. Thus it is fundamental to know the parameters of this network and their variation. This paper presents an evaluation of the impact of power grid disturbances on the performance of a solar PV plant under real conditions. The CICAD photovoltaic solar plant, connected to the Senelec distribution network, with an installed capacity of 2 MWp is the study setting. An energy audit of the plant is carried out. Then the percentage of each loss is determined: voltage drops, module degradation, inverter efficiency. The duration of each disconnection is measured and recorded daily. The corresponding quantity of lost energy is thus calculated from meteorological data (irradiation, temperature, wind speed, illumination) recorded by the measurement unit in one-minute steps. The observation period is three months. The total duration of disconnections related to the instability of the electrical network during the study period is 46.7 hours. The amount of energy lost is estimated at 22.6 MWh. This represents 2.4% of the actual calculated production.

关键词： Photovoltaic Power Plant Disconnections Network Evaluation Lost En-ergy

Zeta Potential of Aggregate and Dynamic Modulus of HMA Estimation Using Aggregate Silica Content

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 Journal of Civil Engineering 2023年第1期13卷 35-47页

作者： Mouhamed lamine Chérif Aidara Serigne Touba Thiam Alan Carter Department of Geology Faculty of Science and Technology Cheikh Anta DIOP University of Dakar Dakar Senegal Graduate School of Sustainable Development and Society Iba Der Thiam University Thies Senegal Ecole de Technologie Supérieure de Montréal Montréal Canada

The mineralogical composition of an aggregate influences its adhesion with bitumen and therefore its dynamic modulus. However, few studies have been conducted on this aspect. One of the most used properties to describe the impact of aggregate on the adhesiveness phenomena is the zeta potential. In this study, the first mineralogical and chemical properties were considered through the percentage of silica in the rock source of aggregates and the electric aggregate particles charge zeta. Dynamic modulus values used for regression process are determined from complex modulus test on nine asphalt concretes mix designed with aggregate types (basalt of Diack, quartzite of Bakel and Limestone of Bandia). The results showed that aggregate with high percentage of silica have higher zeta potential than aggregate with low percentage of silica. The development of a zeta potential predictive model showed a strong sensitivity to silica. The results of the complex modulus tests showed that Hot Mixture Asphalt (HMA) mixed with aggregate containing high silica contents gave better results than those mixed with aggregates containing low percentage of silica. The dynamic modulus predictive models of HMA developed shows that it is the properties of bitumen that influence more. However, the effect of silica although low, is very marked at low temperatures and high frequencies.

关键词： Basalt of Diack Quartzite of Bakel Limestone of Bandia Complex Modulus Test Binder-Aggregate Adhesiveness