检索结果-南通市图书馆

Stabilization of a Lateric Clay from Burkina Faso with Cement-Metakaolin for an Application in Road Construction

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 Materials Science and Chemical Engineering 2023年第6期11卷 1-20页

作者： Souleymane sanou issiaka sanou Moussa Ouedraogo Halidou Bamogo Lohami Valentin Landry Gnoumou Younoussa Millogo Seynou Mohamed Laboratoire de Chimie et Energies Renouvelables (LaCER) Département de Chimie Université Nazi BONI (UNB) Bobo Dioulasso Burkina Faso Laboratoire de Chimie Moléculaire et des Matériaux (LC2M) Département de Chimie Université Joseph KI-ZERBO (UJKZ) Ouagadougou Burkina Faso

The objective of this work is to obtain a composite of clay-cement-metakaolin having good mechanical properties and geotechnical. To do this, a lateritic clay from Burkina Faso referenced ALK was characterized by various methods (X-ray diffraction, infrared spectrometry, thermal analysis and Inductively Coupled Plasma, Atomic Emission Spectrometry) in order to be used as a base course after adding cement and metakaolin. The results of the mineralogical characterization of this clay showed that it is composed of kaolinite (65.7 wt.%), quartz (19.3 wt.%) and goethite (10.8 wt.%). The geotechnical tests carried out showed that ALK is moderately plastic with a plasticity index Ip = 22%. The optimum moisture content and the maximum dry density are respectively 15.9% and 1.76 g∙cm-3. Simple compressive strength and splitting tensile strength are Rc = 1.59 MPa and ft = 0.149 MPa respectively. The California Bearing Ratio (CBR) index at 95% is 40% and above the minimum value of 30% shows that ALK can be used as a sub-base course in road construction. The addition of cement and metakaolin in various proportions improved the CBR index and the mechanical strength of the composites produced. This improvement is due to the formation of hydrated calcium silicate (CSH) resulting from the pozzolanic reaction between the portlandite of the cement and the amorphous silica of the metakaolin. Thus the 2 wt.% metakaolin and 6 wt.% cement formulation with a 95%CBR index of 81% is suitable for the development of a base course in road construction.

关键词： Lateritic Clay Cement Metakaolin Road Construction The California Bearing Ratio Index

Production and Characterization of Pozzolan with Raw Clay from Burkina Faso

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 Minerals and Materials Characterization and Engineering 2016年第3期4卷 195-209页

作者： Mohamed Seynou Younoussa Millogo Lamine Zerbo issiaka sanou François Ganon Raguilnaba Ouedraogo Kalsibiri Kaboré Laboratoire de Chimie Moléculaire et des Matériaux UFR/Sciences Exactes et Appliquées Université Ouaga I Ouagadougou Burkina Faso Université Polytechnique de Bobo-Dioulasso UFR/Sciences et Techniques Bobo-Dioulasso Burkina Faso Laboratoire National de Batiment et de Travaux Publics Ouagadougou Burkina Faso

Four raw deposits clayey materials in Burkina Faso have been characterized using X-ray diffraction, infrared spectroscopy and ICP-AES to evaluate their suitability to be used as pozzolan in cement. The samples have been activated by thermal treatment at 730°C during 5 hours. The obtained metakaolin was investigated by means of complementary techniques for their use as pozzolan in building materials. Fineness, surface area and amorphousness of metakaolins were the dominant factors which influenced their pozzolan reactivity. The compressive strengths of blended specimens were slightly increased with metakaolins named MK1 and MK2 than the reference for the substitution of 20 - 25 wt%. This was due to the metakaolins’ pozzolan reactivity and their filler effects which promoted CSH formation and reduced pores in the specimens. MK1 and MK2 were suitable for replacement of Portland cement in the field of building materials.

关键词： Raw Clayey Materials Characterization Metakaolin Pozzolan Reactivity Building Materials

Characterization of Peanut Shells for Their Valorization in Earth Brick

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 Minerals and Materials Characterization and Engineering 2020年第4期8卷 301-315页

作者： Ouanmini Bobet Sory Nassio Mohamed Seynou Bakiono Remy Lamine Zerbo issiaka sanou Moustapha Sawadogo Younoussa Millogo Escadeillas Gilles University Joseph KI-ZERBO UFR-SEA Ouagadougou Burkina Faso University Nazi BONI UFR-ST Bobo-Dioulasso Burkina Faso Laboratoire Matériaux et Durabilité des Constructions (LMDC) Université de Toulouse UPS INSA Toulouse France

Peanut shells from Burkina Faso were characterized using mineralogical, microstructural and chemical methods to perform its possibility to be used as reinforce in adobe bricks. It consists of cellulose (48 wt%), hemicellulose (3 wt%) and lignin (28 wt%). The peanut shells were characterized by high porosity and showed water absorption around 198% at 72 hours. Its chemical composition is essentially composed of silica, iron oxides, alumina and calcium oxide. Its microstructure showed that the peanut shells were a compilation of microfibers with high porous of borders. In watery solution, the peanut shells released polyphenols. Thermal conductivity of peanut at 25 °C was 0.155 ± 0.021 W/mK. The physico-chemical characteristics of peanut shells were similar to those found with agricultural by-products used in adobe reinforce.

关键词： Agricultural Wastes Peanut Shells Thermal Conductivity Adobes Durability

Study of the Influence of Clay in the Degradation of Methylene Blue by Photo-Fenton Process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2024年第11期15卷 538-557页

作者： Namory Méité Lébé Prisca Marie-Sandrine Kouakou Alfred Niamien Kouamé Aliou Guillaume Lemeyonouin Pohan issiaka sanou Gaoussou Cissé Christelle Adja Kouakou Yao Jonas Andji-Yapi Laboratoire de Constitution et Raction de la Matire (LCRM) UFR-Science des Structures de la Matire et Technologie (SSMT) Universit Flix Houphout-Boigny (UFHB) Abidjan Cte dIvoire Departement de Mathmatiques Physique et Chimie UFR des Sciences Biologiques Universit Pelefero Gon Coulibaly Korhogo Cte dIvoire Unit de Formation et de Recherche en Sciences Exactes et Appliques (UFR/SEA) Laboratoire de Chimie et Energies Renouvelables (LaCER) Universit Nazi BONI Bobo-Dioulasso Burkina Faso Institut National Polytechnique Houphout Boigny (INP-HB) de Yamoussoukro Yamoussoukro Cte dIvoire

Industrial effluents from textile, tannery or printing activities often have a significant pollutant load composed of dyes that are difficult to biodegrade. These dyes pose a threat to the environment. To overcome this problem, various processes have been developed to eliminate these dyes in wastewater before their release into nature. Conventional biological or physical processes most often prove to be ineffective and expensive. It is therefore necessary to resort to other processes such as advanced oxidation processes (POA). This work therefore focuses on the study of the influence of clay in the degradation of Methylene Blue by the photo-Fenton process which is one of the advanced oxidation processes (POA), with the source of irradiation, natural light. To do this, two clays from Côte d’Ivoire referenced AB and Aga were the subject of a physicochemical and mineralogical characterization. The results showed that Aga clay is composed of 75.43% quartz, 12.72% kaolinite, 8.75% illite and 3.12% goethite and AB clay consists of 61, 36% kaolinite, 28.6% quartz and 10.10% illite. Under natural light irradiation the optimal amounts of Fenton reagents (iron: 10 mg;H2O2: 0.1 mL) were determined. Finally, the addition of clay to the photo-Fenton process made it possible to improve the degradation of the pollutant (Methylene Blue). Indeed, the yield increased from 92% for the photo-Fenton process to 98.43% with the addition of AB clay and 98.13% for the addition of Aga clay. The results of the degradation kinetics clearly show that the degradation follows the pseudo-second order kinetics with correlation coefficients greater than 0.99.

关键词： Methylene Blue Clay Photo-Fenton Pollutant Degradation

Watering techniques and zero-valent iron biochar pH effects on As and Cd concentrations in rice rhizosphere soils,tissues and yield

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 Environmental Sciences 2021年第2期33卷 144-157页

作者： Md Shafiqul Islam Yali Chen Liping Weng Jie Ma Zulqarnain Haider Khan Zhongbin Liao Abdoul Salam issiaka Abdoul Magid Yongtao Li Agro-Environmental Protection Institute/Key Laboratory for Environmental Factors Control of Agro Product Quality Safety Ministry of Agriculture and Rural AffairsTianjin 300191China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Chinese Academy of Agricutural Sciences Beijing 100081China Department of Soil Quality Wageningen Universit6700 AAWageningenNetherlands

Zero-valent iron amended biochar(ZVIB)has been proposed as a promising material in immobilizing heavy metals in paddy *** this study,the impacts of p H of ZVIB(p H 6.3 and p H 9.7)and watering management techniques(watering amount in the order of CON(control,5/72)>3/72>1-3/72>3/100>1/72,with 5/72,for example,representing irrigation given to 5 cm above soil surface in 72 hr regular interval)on As and Cd bioavailability for rice and its grain yield(Yield BR)were investigated in a pot *** rice As(As BR)content was irrelative to the watering treatments,while significantly decreased(>50%)with the addition of both ZVIB *** diminutions of brown rice Cd(Cd BR)content as well as the Yield BR were highly dependent on both the soil amendment materials’p H and watering *** all the watering treatments,3/72 treatment(15%less irrigation water than the CON)with ZVIB 6.3 amendment was the optimum fit for simultaneous reduction of As BR(50%)and Cd BR contents(19%)as well as for significant increment(12%)of the Yield *** high pH(9.7)ZVIB application could also efficiently decrease As and Cd contents in brown rice,it might risk grain yield lost if appropriate(e.g.3/72 in our study)watering management technique was not ***,ZVIB would be an environmentally friendly option as an amendment material with proper selection of watering management technique to utilize As and Cd co-contaminated arable soils safely for paddy cultivation.

关键词： Brown rice As Brown rice Cd Grain yield Paddy soils Water management Zero-valent iron biochar

Natural Radioactivity Measurement and Dose Assessment in Soil Samples from Some Selected Areas of Mali

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

World Journal of Nuclear Science and Technology 2019年第2期9卷 67-73页

作者： issiaka Traoré Abdramane Ba Abdel Mjid Nourreddine Département de Physique Université des Sciences des Techniques et Technologies de Bamako Bamako Mali Institut Pluridisciplinaire Hubert Curien (IPHC) Université de Strasbourg Strasbourg France

This is the first time that a study applies the gamma ray spectroscopy using a high purity germanium to evaluate the terrestrial gamma radiation level by detector in selected regions of Mali. The results reveal that the activity concentrations of naturally occurring 226Ra, 232Th and 40K radionuclides ranges between respectively 17.26 ±1.81 and 105.43 ±10.36;20.41 ±2.52 and 180.85 ±19.69;41.33 ±8.26 and 627.63 ±85.62 Bq⋅kg−1. The measures of radium equivalent activity (Raeq), absorbed dose rates (ADR), annual effective dose rate (AEDR), external hazard index (Hex), internal hazard index (Hin) and excess lifetime cancer risk (ELCR) were evaluated. Some of the obtained values exceed the recommended safe levels. Further studies are necessary to constitute a baseline reference data about the terrestrial radiation in Mali.

关键词： Soil Radioactivity Radiological Hazard Population Exposure Gamma Spectrometry Mali

Micropulse diode laser therapy in refractory glaucoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Ophthalmology Practice and Research 2023年第1期3卷 23-28页

作者： Moctar issiaka Khalil Zrikem Adil Mchachi Leila Benhmidoune Rayad Rachid Mohamed EL.Belhadji Abdoul Salam Youssoufou Souley Abdou Amza Faculty of Medicine and Pharmacy Hassan II University of CasablancaCasablancaMorocco Adult Ophthalmology Department 20 August 1953 HospitalIbn Rochd University Hospital of CasablancaCasablancaMorocco Ophthalmology Department of the Amirou Boubacar Diallo National Hospital NiameyNiger

Purpose:Description of safety and efficacy of micropulse lYanssderal cydophotocoagulation as a treatment option for refractory ***:This is a prospective study including 39 eyes of 31 patients foil owed for refractory glaucoma,who benefited from transsderal cyclophotocoagulation using a mic topi used *** main indication for tire procedure was increased ocular pressure refractory to quadri therapy in various types of *** patients were tieated using iridex Cyclo G6 laser with a Micropulse P3 infrared probe with a wavelength of 810 *** parameter for tire procedure were a duration of 90 s per hemisphere with a power of 2000 mW and an eneigy of 180 *** tire upper and lower hemispheres were treated in tire same procedure,sparing tire 3 o'clock and 9 o'clock meridians,and aD tire patients benefited from a single treatment *** following parameters were evaluated;ocular pain and overall tolerance;visual acuity;and tire evolution of IOP postoperatively up to 9 ***:The glaucoma subtypes treated are as follows:primaty open-angle glaucoma(n=05),chronic angle-closure glaucoma(n=13),neovascular glaucoma(n=07),aphakic glaucoma(n=06),malignant glaucoma(n=04),post-traumatic angle recession(n=02),and inflammatoiy glaucoma(n=02).The mean pre-operative intraocular pressure was 42.3±5.2 mmHg and tire mean post operative intraocular pressure at 9 months was 16.9±1.9 mmHg The reduction in IOP was 49.9%.The average number of intraocular pressure-lowering medications used prior to surgery was four,and tire average number of medications used at tire 9-month postoperative visit was 2.0±1.2(703%of patients were on dual therapy).The overall success rate was 60.9%.Conclusions:Micropulse transsderal cydophotocoagulation appears to be a safe and effident treatment for refractory *** indications should therefore be broadened and proposed early in various situations.

关键词： Micropulse laser Transscleral cyclophotocoagulation Refractory glaucoma Intraocular pressure

Use of a Multiple Regression Model in the Estimation of Water Borehole Flows in the Middle of Cracked Basement in Côte d’Ivoire

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 Water Resource and Protection 2020年第7期12卷 527-544页

作者： Assoué Kouakou Sylvestre Kouadio Ouedraogo Moussa Ismaïla Ouattara issiaka Savane Laboratoire Géosciences et Environnement (LGE) UFR des Sciences et Gestion de l’Environnement (SGE) University of Nangui Abrogoua (UNA) Abidjan C&ocirc te d’Ivoire Laboratoire Géosciences et Environnement (LGE) UFR Sciences Géologique et Minière (SGM) University of Man (UM) Man C&ocirc te d’Ivoire

The objective of this study was to propose a mathematical regression model to estimate the exploitation flow rate of a water borehole from geophysical parameters in the midst of a fissured basement in the central-eastern part of C?te d’Ivoire. The data of the study are both hydrogeological and geophysical parameters from one hundred and eleven (111) data sheets of (111) water and geophysical boreholes. Two methods were used. The Normal Principal Component Analysis (NPCA) method applied to the data made it possible to select the explanatory variables (geophysical parameters) for borehole productivity. The multiple linear regression method subsequently made it possible to propose a mathematical model capable of estimating the exploitation rate from the geophysical parameters. The results indicate a very strong correlation (0.87) between longitudinal conductivity and flow rate, with flow rate and apparent resistivity negatively correlated. The multiple linear regression method highlighted two relevant explanatory variables, longitudinal conductivity and apparent resistivity. These two geophysical parameters contributed to a mathematical model in the form Q = C1X1 + C2X2 + ... + CnXn + C0. the real model obtained in this work is Q = 0.82Cl - 0.12*** + 2.5. The resulting model is efficient with a correlation of 86% in calibration and 95% in validation. A bias of 0.37 in calibration and 0.82 in validation is observed. Finally, the square root mean square error (RMSE) is 3.10 to 3.38 respectively in calibration and validation.

关键词： Productivity Drilling Apparent Resistivity Longitudinal Conductivity Linear Regression Fissured Aquifers

Evaluation of the Nutritional Quality of Red and Refined Palm Oils Marketed in Yamoussoukro (Côte d’Ivoire)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2022年第2期13卷 97-107页

作者： Behibolo A. Yoboue Koffi Diallo issiaka Diomande Gnomblesson G. Tiahou Nogbou E. Assidjo Laboratory of Industrial Synthesis Processes of Environment and New Energies (LAPISEN) Institut National Polytechnique Félix Houphou&#235 t-Boigny (INP-HB) Yamoussoukro C&#244 te d’Ivoire Laboratory of Nutrition and Food Security (LNSA) Nagui-Abrogoua University Abidjan C&#244 te d’Ivoire Laboratory of Medical Biochemistry Unit of Training and Medical Research Alassane Ouattara University (UAO) Bouaké C&#244 te d’Ivoire

In order to define the nutritional quality of commercialized red and refined palm oils, palm oil samples conditioned or not with aluminum foils were placed in solar radiation for four weeks. Each week, the levels of peroxides, free and unsaturated fatty acids and then vitamins A and E were determined. From these analyzes, the proportions of peroxides and free fatty acids increased with solar exposure time of the oils. These rates ranged from 0.11 to 24.00 meq O2/Kg (peroxides) and from 1.11 to 17.14 KOH/g (free fatty acids). Also, iodine index levels of palm oils decreased during sun exposure “95.11 - 3.22 g I/100 g”. In addition, vitamin A and E losses from palm oil samples increased with exposure time. These losses ranged from 0% to 94.49% for vitamin A and from 0% to 83.42% for vitamin E from the day of purchase of oils in the fourth week of sun exposure. However, the deterioration of nutritional quality was greater with red and refined palm oil samples unprotected with aluminum foils than those protected.

关键词： Nutritional Quality Palm Oil