检索结果-南通市图书馆

Influence of Climate on Sugarcane Yield in Côte d’Ivoire: Case of the Ferkessédougou Region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Climate Sciences 2023年第4期13卷 565-586页

作者： Sinali Dosso arsène Kobea Fidèle Yoroba Benjamin Kouassi Kouakou Kouadio Adama Diawara Arona Diedhiou Laboratoire des Sciences de la Matière de l’Environnement et de l’Energie Solaire (LASMES) of Université Félix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire Laboratoire Mixte International Climat-Eau-Energy-Agriculture Université Félix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire Geophysical Station of Lamto (GSL) N’Douci C&#244te d’Ivoire Université de Grenoble Aples (Univ. Grenoble Alpes) Institut de Recherche pour le Développement (IRD) Centre National de la Recherche Scientifique (CNRS) Institut National Polytechnique de Grenoble (Grenoble INP) Institut des Géosciences de l’Environnement (IGE) Grenoble France

This study aims to understand the current climatic trends and explain the possible losses of agricultural yields. To achieve this objective, this work characterized the evolution of extreme temperature indices in the sugar complexes of Ferké 1 and Ferké 2, two stations located in the northern part of C?te d'Ivoire. The onset and cessation dates of the rainy season and the length of the rainy season were investigated. The agricultural and climatic data were obtained from each sugar complex. The period of study ranges from 2002 to 2019 in Ferké 1 and Ferké 2. The results show significant upward trends in extreme temperature indices. The analysis of sugarcane yield associated with the different climatic parameters shows no significant results in general. However, on the Ferkessédougou sugar complexes, the results highlight that maximum and minimum temperatures could be the variables that influence most yield production. The maximum temperature with coefficients of 1.60 and 0.77 at Ferké 1 and Ferké 2 respectively seems to contribute to an increase in yield while the minimum temperature with coefficients of -0.98 and -0.22 at Ferké 1 and Ferké 2 respectively could lead to a loss in yield. The results obtained with the Single Linear Regression (SLR) and the Multiple Linear Regression (MLR) models also highlight the strong influence of minimum and maximum temperatures.

关键词： Onset and Cessation Dates Duration Rainfall Temperature Climatic Indices Sugarcane Yield Ferké 1 Ferké 2

Analysis of Modeling the Influence of Electromagnetic Fields Radiated by Industrial Static Converters and Impacts on Operators Using Maxwell’s Equations

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 Applied Sciences 2024年第8期14卷 2320-2350页

作者： Anthony Bassesuka Sandoka Nzao Tuka Biaba Samuel Garcia Obed Bitala arsène Kasereka Kibwana Emmanuel Ndaye Kibuayi ISTA Kinshasa Electrical Engineering Kinshasa Democratic Republic of Congo Doctoral School of ISTA Kinshasa Complementary Master in Science and Technology/Electrical Engineering Electrotechnical Option Kinshasa Democratic Republic of Congo ISTA Kinshasa Doctoral School in Science and Technology Electronics Option Kinshasa Democratic Republic of Congo

The study of Electromagnetic Compatibility is essential to ensure the harmonious operation of electronic equipment in a shared environment. The basic principles of Electromagnetic Compatibility focus on the ability of devices to withstand electromagnetic disturbances and not produce disturbances that could affect other systems. Imperceptible in most work situations, electromagnetic fields can, beyond certain thresholds, have effects on human health. The objective of the present article is focused on the modeling analysis of the influence of geometric parameters of industrial static converters radiated electromagnetic fields using Maxwell’s equations. To do this we used the analytical formalism for calculating the electromagnetic field emitted by a filiform conductor, to model the electromagnetic radiation of this device in the spatio-temporal domain. The interactions of electromagnetic waves with human bodies are complex and depend on several factors linked to the characteristics of the incident wave. To model these interactions, we implemented the physical laws of electromagnetic wave propagation based on Maxwell’s and bio-heat equations to obtain consistent results. These obtained models allowed us to evaluate the spatial profile of induced current and temperature of biological tissue during exposure to electromagnetic waves generated by this system. The simulation 2D results obtained from computer tools show that the temperature variation and current induced by the electromagnetic field can have a very significant influence on the life of biological tissue. The paper provides a comprehensive analysis using advanced mathematical models to evaluate the influence of electromagnetic fields. The findings have direct implications for workplace safety, potentially influencing standards and regulations concerning electromagnetic exposure in industrial settings.

关键词： Modeling Electromagnetic Field Power Converters Geometric Parameters Biological Tissue Maxwell Equation Bio-Heat Equation Thermal Model

2.5D Modelling of Aeromagnetic Data and their Mining Implications over the Ngaoundere Area (Adamawa Province, Cameroon)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2019年第2期10卷 173-192页

作者： Meying arsène Gouet Daniel Hervé Ndougsa Mbarga Theophile Ndam Njikam Mouhamed Owono Amougou Olivier Ulrich Igor School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Department of Petroleum Mining & Groundwater Resources Exploration Faculty of Mines and Petroleum Industries University of Maroua Maroua Cameroun Department of Physics Advanced Teacher’s Training College University of Yaoundé I Yaoundé Cameroon Postgraduate School of Science Technologies & Geosciences University of Yaoundé I Yaoundé Cameroon

This study is based on the analysis and interpretation of aeromagnetic data using version 8.4 of the Geosoft Oasis Montaj Software, to map the subsurface or deep geological structures that affected the geological formations of the Ngaoundere area. The use of the standard aeromagnetic methods made it possible to draw up the maps of the residual magnetic field reduced to the equator (RTE), the horizontal gradient (HG), the analytical signal (AS) and that of the Euler solutions (ED) to find the main magnetic facies corresponding to these structures. The geological formations of the studied area thus appear to be intensely fractured by a ne-SW (N45°E) and Ene-WSW (N70°E) main orientation fault system, the depth of which has been estimated by combining the three-analytical methods HG, AS and ED. Advanced magmatic map analysis revealed dikes associated with vertical faults in the studied area. The development of an interpretative geological map taking into account the basic geology, the deep faults, the identified dikes and the mineralization index made it possible to extract a correlation between geological structures and mineralization of the studied area. The 2.5D modelling of two magnetic profiles plotted on the reduced residual map at the equator was performed to approximate the geometry and depth of the dikes sector, which are potential sources of mineralization here.

关键词： Aeromagnetic Data Analytical Methods Faults Mineralization 2.5D Modelling

Brief Inventory of Phytoseiidae(Parasitiformes)Found on Vegetable Crops in the Republic of Congo

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 Zoological Research 2022年第2期4卷 1-8页

作者： Mireille Belle Mbou Okassa Valentin Dibangou Grâce Nianga Bikouta Dollon Mbama Ntabi arsène Lenga Laboratory of Biodiversity and Animal Ecology Faculty of Science and TechnologyMarien Ngouabi UniversityBP 69Republic of Congo

According to the last revised catalogue of the mite family Phytoseiidae and the online Phytoseiidae database,only six species of predatory mites have been identified to date in the Republic of Congo(RC).Two species were reported on cassava(Manihot esculenta),two on coffee(Coffea spp.),one on lemon(Citrus spp.),and one on unidentified *** this study,we catalogued predatory mites on five plants of economic interest in the *** hundred and forty-seven mite specimens were collected on Manihot esculenta,Solanum lycopersicum,Solanum melongena,Abelmoschus esculentus,and Capsicum *** taxonomy was used to identify the collected *** morphological characteristics of the females were analyzed,including the lengths of the dorsal setae,presence or absence of dorsal and ventrianal setae,shape of insemination apparatus,leg chaetotaxy,and cheliceral *** species belonging to two sub-families(Phytoseiinae and Amblyseiinae)and five genera(Amblyseius,Euseius,Paraphytoseius,Phytoseius,and Iphiseius)were *** these six species,only one had previously been observed in the RC;the remaining five species are reported.

关键词： Traditional taxonomy Phytoseiinae Amblyseiinae Cassava Tomato Aubergine Okra Chili

Medium effects on micropropagation and genetic stability of Citrullus lanatus oleaginous type

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences 2013年第7期4卷 32-44页

作者： Yah Gwladys Gnamien Irié arsène Zoro Bi Yatty Justin Kouadio Yves Brostaux Jean-Pierre Baudoin Laboratory of Biology and Improving Vegetable Productions Natural Sciences UnitUniversity Nangui Abrogoua(UNA)AbidjanCote d’Ivoire Tropical Crop Husbandry and Horticulture Gembloux Agro-Bio Tech(GxABT)University of LiègeGemblouxBelgium Department of Applied Statistics Computer Science and MathematicsGembloux Agro-Bio Tech(GxABT)University of LiègeGemblouxBelgium

To regenerate adventitious shoots from the cotyledon proximal parts of Citrullus lanatus (Thunb.) Matsum. and Nakai ssp. mucosospermus (Fursa) oleaginous type, different concentrations of MS mineral elements, sucrose, 6-benzylaminopurine (BAP) and agar were tested. Shoot induction proved to depend on the interaction between levels of sucrose, BAP and MS mineral elements in the medium. The medium containing 3/2 strength of MS mineral elements, 35 g/l sucrose and 1 mg/l BAP solidified with 6 g/l agar allowed the production of numerous shoots without a callus phase. After 3 weeks of culture, 76.7% of the cotyledon proximal parts induced shoots with an average of 12.26 shoots per explant and a mean shoot length of 17.13 mm. The induced shoots were directly rooted and thus complete plants ready for acclimatization were obtained using a two steps procedure. Depending on the genotype, the shoot induction from cotyledon proximal parts ranged from 54% to 96%. Rooted plantlets were acclimatized and transferred to field, where they grew well, developed flowers and fruits like seeded plants. The assessment of the genetic stability of the in-vitro-regenerated plantlets by means of an Amplified Fragment Length Polymorphism (AFLP) analysis with the combination of 5 primers revealed no differences between regenerated plantlets and mother plants.

关键词： AFLP Genetic Stability In Vitro Oleaginous Seeds Organogenesis

Geoelectrical Inversion Study of Limestone Attributes at Mayo Boki Area (Northern Cameroon)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2014年第8期5卷 816-825页

作者： Theophile Ndougsa-Mbarga Quentin Yene-Atangana Joseph William Teikeu Assatsé arsène Meying Pactrick Assembe Stéphane Department of Earth Sciences Faculty of Science University of Yaoundé I Yaoundé Cameroon Department of Physics Advanced Teachers’ Training College University of Yaoundé I Yaoundé Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon School of Geology and Mining Exploitation College University of Ngaounderé Ngaounderé Cameroon

A geoelectrical survey using the electrical resistivity method was carried out in the Mayo Boki (Northern Cameroon), to investigate the subsurface layering and evaluation of the limestone characteristics. In addition to geological data collection, three vertical electrical soundings and one electrical resistivity profile were measured. Joint interpretation of the DC data allows us to obtain reliable 1D models of the resistivity distribution. The interpretation of the field data was carried out using the RES2DINV software, which converts the apparent resistivity as a function of electrode spacing to the true resistivity as a function of depth in two dimensions. The results obtained from the electrical resistivity survey showed that: 1) A limestone layer was put in evidence at a depth of 4 m and the thickness varies from 13 m to 44 m;2) The limestone layer resistivity is ranged from 125 to 2410 ohm.m;3) An area of probable limestone deposit with interesting thicknesses have been identified. These facts are useful for future mining exploration as drilling map definition and operations. The geologic section of a nearby location termed resistivity profile was delineated and its total depth was found to be 57 m, which corroborates the lithologs of the boreholes from the area. The correlation of geological data and the geoelectric section has led to envisage pursuing exploration activities. Based on the limestone layer characteristics extracted from this DC investigation, the exploration drilling operations have to be initiated in order to define the limestone resource over the area of study, which will certainly enables to built the exploitation project prefeasibility document.

关键词： Geoelectrical Method 1D Model Resistivity Limestone Mayo Boki Cameroon

Assessment of Liver Fibrosis in HBsAg-negative and Anti HBc Positive Patients

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 Gastroenterology 2024年第10期14卷 331-339页

作者： Kounpiélimé Sosthène Somda Aboubacar Coulibaly Oyétoundé Taofick Amanda Sandrine Marie Odile Soudre Lawagoulé Joseph Emile Ky Christiane Bere arsène Roger Sombie Department of Hepato-Gastroenterology Yalgado Ouedraogo University Hospital (CHU-YO) Ouagadougou Burkina Faso Department of Medicine University Joseph KI-ZERBO Ouagadougou Burkina Faso

Background: Surface antigen (HBsAg) is the mean marker of hepatitis B virus infection. During the course of the infection, some patients lose the HBsAg and only the presence of anti-HBc antibody indicates previous contact with the virus. Among these patients, some have detectable viral load (occult infection) but most without viral replication. There is no guideline regarding these patients. The aim of this study was to assess hepatic fibrosis in patients with only the hepatitis B virus contact marker “total anti-HBc”. Patients and methods: it was a descriptive and analytical cross-sectional study, conducted in three private hospitals from January to August 2022. Were included HBsAg-negative and HBc-positive patients, consulting in Gastroenterology departments. Noninvasive methods (APRI, FIB-4 and FIBROSCAN) were used to evaluate liver stiffness because of their easy accessibility and low-cost. The hepatic fibrosis was considered significant when the score determined by APRI, FIB-4 and FIBROSCAN® tests was respectively greater than 1.5;2.67 and 8 kPa corresponding to fibrosis level 2 (F2). Results: A total of 63 HBsAg-negative/total HBcAg-positive patients were included. The mean age was 49.9 ± 13.4 years. The male/female sex ratio was 1.78. Of the 63 patients, 19 had significant liver fibrosis (30.1%) among which 9 patients had HCC. The FIB-4 score outperformed the APRI score in assessing liver fibrosis, with a sensitivity of 84.2%, a specificity of 100% and a negative predictive value of 93.6%. In univariate analysis, there was a significant association between the occurrence of significant liver fibrosis and age over 40 years, dyslipidaemia, obesity, alcohol consumption, smoking, herbal medicine, negative anti-HBs immunological status and detectable viral load. Conclusion: Our study revealed a high prevalence of significant to severe hepatic fibrosis in anti-HBc positive patients. In most of the cases, the fibrosis was severe. Progression to HCC has also been pos

关键词： Anti HBc Positives Liver Fibrosis Sub-Saharan Hepatitis B Virus

临终关怀与安乐死的整合:比利时模式的实验与回答

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

医学与哲学（A） 2014年第12期35卷 5-10页

作者： Jan L.Bernheim Wim Distelmans arsène Mullie Micha el A.Ashby 于磊布鲁塞尔自由大学根特大学临终关怀研究小组布鲁塞尔自由大学医学与药学系布鲁塞尔医院支持与姑息治疗部弗兰德斯联合会南方塔斯马尼亚卫生组织霍巴特皇家医院塔斯马尼亚大学医学院卫生科学系大连医科大学杂志社辽宁大连116044

通过《生命伦理学探究杂志》顾问编辑Michael Ashby提出的一系列问题对比利时临终照护模式的构成进行分析。分析了关于比利时姑息治疗与安乐死之间互补及协同关系。在比利时模式的整合临终护理中,安乐死是姑息治疗途径的终点。安乐死合... 详细信息

通过《生命伦理学探究杂志》顾问编辑Michael Ashby提出的一系列问题对比利时临终照护模式的构成进行分析。分析了关于比利时姑息治疗与安乐死之间互补及协同关系。在比利时模式的整合临终护理中,安乐死是姑息治疗途径的终点。安乐死合法化制定于2002年,而后,众多姑息治疗服务兴起。随着公众对卫生保健机构信心的提升和社会态度的广泛进步,对姑息治疗和安乐死的支持水平明显提高,这将使二者的协同发展成为可能。虽然目前比利时模式仍表现出一些缺陷,但一些解决方案正在制定过程中。

关键词：姑息治疗安乐死死亡与临终比利时

Enhancing Tomato (Solanum lycopersicum L.) Fruit Yield and Quality and Blossom End Rot Control Using Different Biological Calcium Sources

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

Journal of Agricultural Chemistry and Environment 2023年第3期12卷 263-274页

作者： Alain Serge Coulibaly Kouakou Laurent Kouakou Jonas Patrick Dao Camille Kouakou Juliette Ky Dedi Irié arsène Zoro Bi Training and Research Unit of Sciences of Nature Laboratory of Biology and Improvement of Plant Production Nangui Abrogoua University Abidjan C&ocircte d’Ivoire Phytotechnical Unit and Genetic Improvement Training and Research Unit of Sciences of Nature Nangui Abrogoua University Abidjan C&ocircte d’Ivoire Training and Research Unit of Biosciences Plant Physiology Laboratory Felix Houphou&eumlt Boigny University Abidjan C&ocircte d’Ivoire

Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in susceptible cultivars, may cause severe economic losses. The goal of this study is to determine the effect of three organic calcium sources on the growth and quality of fruit production of tomatoes. Egg, snail and sea shell powders and extracts have been used as biological fertilizers. The experiment was conducted in a block factorial trial with three replications. The trials comprised two factors: calcium sources and calcium source form (powder and extract). The results showed that the growth parameters and yield were improved by the calcium source, whatever the form. Also, BER was lower in plants treated with calcium contrary to the control. However, plants treated with eggshells showed the best growth (mean) and the lowest rate (0.40%) of BER than the snail and sea shell.

关键词： Tomatoes Blossom End Rot Eggshells Snail Shells Seashells

维普期刊数据库