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Geochemical fingerprints and hydrocarbon potential of Paleocene mudrocks in the Tano Basin, Ghana: insights from biomarkers and stable carbon isotopes

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Acta Geochimica 2024年第2期43卷 255-279页

作者： Kojo Amoako nancy Pearl Osei-Boakye ningning Zhong n’guessan francois de sales konan Gordon Foli Prince Opoku Appau Clifford Fenyi Ebenezer Apesegah Research Group for Marine Geochemistry(ICBM-MPI Bridging Group) Institute for Chemistry and Biology of the Marine Environment(ICBM)Carl von Ossietzky University OldenburgAmmerlander Heerstr.26129 OldenburgGermany State Key Laboratory of Petroleum Resources and Prospecting College of GeosciencesChina University of PetroleumBeijing 102249China department of Geological Engineering Faculty of Civil and Geo-EngineeringKwame Nkrumah University of Science and TechnologyKumasiGhana Ghana national Gas Company 225 Osibisa CloseAirport WestAccraGhana Petroleum Corporation GNPCPMBPetroleum HouseTemaGhana

The Paleocene mudrocks in Ghana’s Tano Basin have received limited attention despite ongoing efforts to explore hydrocarbon resources.A thorough geochemical analysis is imperative to assess these mudrocks’petroleum generation potential and formulate effective exploration *** this study,a comprehensive geochemical analysis was carried out on ten Paleocene rock cuttings extracted from TP-1,a discovery well within the Tano *** analytical techniques,including total organic carbon(TOC)analysis,Rock–Eval pyrolysis,gas chromatography-mass spectrometry,and isotope ratio-mass spectrometry,were employed to elucidate their hydrocar-bon potential and organic ***ﬁndings in this study were subsequently compared to existing geochemical data on Paleocene source rocks in the South Atlantic marginal *** results indicated that the Paleocene samples have TOC content ranging from 0.68 to 2.93 wt%.The prevalent kerogen types identiﬁed in these samples were Type Ⅱ and Type Ⅲ.Molecular and isotope data suggest that the organic matter found in the Paleocene mudrocks can be traced back to land plants and lower aquatic *** mudrocks were deposited in a transi-tional environment withﬂuctuating water salinity,charac-terized by sub-oxic redox *** indices,both bulk and molecular,indicated a spectrum of maturity levels within the Paleocene mudrocks,spanning from immature to marginally mature,with increasing maturity observed with greater *** comparison,the organic composition and depositional environments of Paleocene source rocks in the Tano Basin closely resemble those found in the niger delta Basin,Douala,and Kribi-Campo Basins,the Kwanza Formation in Angola,and certain Brazilian marginal ***,it is worth noting that Paleocene source rocks in some of the basins,such as the niger delta and Brazilian marginal basins,exhibit rela-tively higher thermal maturity levels compared to those observed in the current Paleocene samp

关键词： Paleocene source rocks Source input depositional environment Thermal maturity Hydrocarbon potential Tano Basin West Africa

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Study of the Viscosity and Specific Gravity of the Ternary Used Frying Oil (UFO)-Bioethanol-Diesel System

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 53-66页

作者： konan Edmond Kouassi Abollé Abolle n’guessan Luc Brou David Boa n’guessan Raymond Kre Kouassi Benjamin Yao Laboratoire de Thermodynamique et Physico-Chimie du Milieu (LTPCM) UFR-SFA UNA Abidjan C&#244te d&#8217Ivoire Laboratoire de Physiques Fondamentales et Appliqué es (LPFA) UFR-SFA UNA Abidjan C&#244te d&#8217Ivoire Laboratoire des Procé d&#233s Industriels de Synth&#232se de l&#8217Environnement et des Energies Nouvelles (LAPISEN) de l&#8217Institut National Polytechnique F&#233lix Houphou&#235t Boigny de Yamoussoukro Yamoussoukro C&#244te d&#8217Ivoire

Fossil fuels cover around 80% of global energy consumption. However, the problems linked to their use justify the choice of using biofuel. In order to reduce as much as possible, diesel rate, an increase in the number of additives may be considered. Thus, in this work, the study of the used frying oil (UFO), bioethanol and diesel ternary system was undertaken. It emerges from this study that the addition of bioethanol reduces the viscosity and the density of the ternary system and permits a 90% substitution rate for diesel between the UFO and bioethanol. Finally, the percentage of oil becomes 40% after adding alcohol compared to the binary diesel crude vegetable oil mixture where this rate is 30%.

关键词： Biofuel UFO-Bioethanol-Diesel Ternary density Viscosity

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Optimization of Biofuel Formulation by Mixture design

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Advances in Chemical Engineering and Science 2024年第1期14卷 48-56页

作者： konan Edmond Kouassi Abollé Abollé Kouamé Olivier-Marc Kouakou David Boa n’guessan Raymond Kré Kouassi Benjamin Yao Laboratory of Thermodynamics and Physical Chemistry of the Environment (LTPCM) UFR-SFA University of Nangui ABROGOUA Abidjan C&#244te d’Ivoire Laboratory of Fundamental and Applied Physics (LPFA) UFR-SFA University of Nangui ABROGOUA Abidjan C&#244te d’Ivoire Laboratory of Industrial Processes for the Synthesis of the Environment and new Energies (LAPISEn) of the Félix Houphouë t Boigny National Polytechnic Institute Yamoussoukro C&#244te d’Ivoire

With the full growth of energy needs in the world, several studies are now focused on finding renewable sources. The aim of this work is to optimise biofuel formulation from a mixture design by studying physical properties, such as specific gravity and kinematic viscosity of various formulated mixtures. Optimization from the mixture plan revealed that in the chosen experimental domain, the optimal conditions are: 40% for used frying oil (UFO), 50% for bioethanol and 10% for diesel. These experimental conditions lead to a biofuel with a density of 0.84 and a kinematic viscosity of 2.97 cSt. These parameters are compliant with the diesel quality certificate in tropical areas. These density and viscosity values were determined according to respective desirability values of 0.68 and 0.75.

关键词： Biofuel Optimization Mixture design

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Management of Mandibular Fractures in Children in Ivory Coast: Experience of the Stomatology and Maxillofacial Surgery department at the University Hospital of Cocody from 2000 to 2019

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Open Journal of Stomatology 2024年第7期14卷 341-349页

作者： Bakary Ouattara Camille Assouan Laurent Boka Koffi konan René Kouakou Ake Lucien Jonathan Yapo Annick Zoglo-Bro Ahi Morel Mounin Chapo Affoué Linda Marie Pierre Koffi Kahder Morel Diarra Atse Kobo n’guessan konan Marc Koffi department of Stomatology Maxillofacial Surgery University Flix Houphout-Boigny Abidjan Republic of Ivory Coast department of Oral Pathology University Flix Houphout-Boigny Abidjan Republic of Ivory Coast

Introduction: Mandibular fractures in children are becoming increasingly common. Treatment of these fractures is difficult due to their anatomical and physiological complexity. Therefore, there is a need for well-codified management. Our main aim was to develop a decision algorithm for the management of mandibular fractures in children based on our experience. Materials and Methods: This was a retrospective descriptive study carried out in the department of Stomatology and Maxillofacial Surgery at the University Hospital of Cocody over a period of 20 years (2000-2019). Results: We enrolled 58 patients. The mean age of the patients was 9.35 ± 2.3 years with a sex ratio of 2.22. Traffic accidents were the main cause of mandibular fractures (60.35%). Condylar fractures were the most common (46.87%). Treatment was orthopedic in 45.76% of cases, mixed (orthopedic and surgical) in 24.14% and surgical in 5.17%. Patients were followed up weekly for 1 month, then monthly for 6 months and annually for 3 years, with panoramic radiographs of the maxilla starting at 21 days. We observed 2 cases of complications: temporomandibular ankylosis and gingival stomatitis. Conclusion: Mandibular fractures are common in children. Management is difficult due to anatomical and physiological peculiarities. The choice of treatment depends on several criteria.

关键词： Fractures Mandible Children Treatment Ivory Coast

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Assessment of Climate Change Impact on Water Requirement and Rice Productivity

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Rice science 2023年第4期30卷 276-293页

作者： konan Jean-Yves n’guessan Botou ADAHI Arthur-Brice konan-WAIDHET Satoh MASAYOSHI nogbou Emmanuel ASSIDJO Environmental Training and Research Unit Laboratory of Environmental Sciences and TechnologiesUniversitéJean Lorougnon GuédéBP 150 DaloaCôte d’Ivoire department of Training and Research of Rural Engineering and Geographic Sciences Institut National Polytechnique FÉLIX HOUPHOUËT-BOIGNYBP 1093 YamoussoukroCôte d’Ivoire University of Tsukuba Ibaraki 305-8577Japan department of Training and Research of Chemical and Food Engineering Laboratory of ModellingInformation and ProcessesInstitut National Polytechnique FÉLIX HOUPHOUËT-BOIGNYBP 1093 YamoussoukroCôte d’Ivoire

Assessing the impact of climate change(CC)on agricultural production systems is mainly done using crop models associated with climate model *** review is one of the few,with the main objective of providing a recent compendium of CC impact studies on irrigation needs and rice yields for a better understanding and use of climate and crop *** discuss the strengths and weaknesses of climate impact studies on agricultural production systems,with a particular focus on uncertainty and sensitivity analyses of crop *** the new generation global climate models(GCMs)are more robust than previous ones,there is still a need to consider the effect of climate uncertainty on estimates when using *** GCMs cannot directly simulate the agro-climatic variables of interest for future irrigation assessment,hence the use of intelligent climate ***,sensitivity and uncertainty analyses must be applied to crop models,especially for their calibration under different *** impacts of CC on irrigation needs and rice yields vary across regions,seasons,varieties and crop ***,integrated assessments,the use of remote sensing data,climate smart tools,CO_(2)enrichment experiments,consideration of changing crop management practices and multi-scale crop modeling,seem to be the approaches to be pursued for future climate impact assessments for agricultural systems。

关键词： climate change rice production irrigation crop model climate model

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Polymorphism of mitochondrial DnA genes involved in asthenozoospermia in infertile patients of Côte d'Ivoire

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Reproductive and developmental Medicine 2023年第1期7卷 38-43页

作者： Jules Erick Hermann Ayekoue konan Guy Sylvère n’zi Ako Aristide Berenger Ako Marie-Florence n’guessan Yapi Guillaume Yayé FounzéguéAmadou Coulibaly Allico Joseph Djaman Biology and Health Laboratory UFR BiosciencesUniversité Felix Houphouët-Boigny22 BP 582 Abidjan 22Côte d'Ivoire Clinical and Fundamental Biochemistry department Institut Pasteur de Côte d'Ivoire01 BP 490 Abidjan 01Côte d'Ivoire department of Parasitology and Mycology Institut Pasteur de Côte d’Ivoire01 BP 490 Abidjan 01Côte d'Ivoire Biochemistry-Microbiology department UFR AgroforesterieUniversitéJean Lorougnon GuédéBP 150 DaloaCôte d'Ivoire

Objective:The relationship between mitochondrial DnA(mtDnA)polymorphisms and abnormalities in sperm quality has been the subject of several studies,with the objective of improving the treatment of male *** study,which contributes to the identification of genetic markers of sperm abnormalities,was conducted to study mtDnA mutations in the asthenozoospermia ***:This case-control study included 30 patients with asthenozoospermia and 28 with normospermia after spermogram and spermocytogram *** the extraction of total DnA from the spermatozoa of 58 ejaculates from these individuals using the phenol-chloroform method,the amplification of genes of interest in mtDnA using specific primers was performed by conventional polymerase chain reaction,and sequencing was used to detect ***:Male patients with asthenozoospermia in the tertiary sector had significantly more mutant-than wild-type(P=0.0005)MT-CO II ***,for the same gene,males with asthenozoospermia and primary infertility had significantly more mutants than the wild-type(P=0.001).Sequencing revealed 29 mutations that were observed only with asthenozoospermia,which could be the basis for low sperm ***:This study identified several mutations in mtDnA genes that could be considered genetic markers of asthenozoospermia if confirmed in a deeper study.

关键词： Asthenozoospermia Côte d'Ivoire Institute of Pasteur Côte d'Ivoire male infertility mtDnA polymorphism

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Influence of the Year and Growing Area on Maize (Zea mays L.) Production in the Central and north-Central Zones of Côte d’Ivoire (departments of Bouake and Katiola)

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American Journal of Plant Sciences 2022年第8期13卷 1116-1125页

作者： Essy konan Jean François Kouassi n’dri Jacob Kouame n’guessan Kouadio Yatty Justin Agricultural Production Improvement Laboratory UFR Agroforestry University of Jean Lorougnon GUEDE (UJLoG) Daloa C&#244 te d’Ivoire

Several studies conducted in recent years in Côte d’Ivoire reveal that agriculture is increasingly affected by the adverse effects of climate variability. The present study aims at evaluating the effect of the zone and the year of cultivation on the productivity of maize in the Central and north-Central zones of Cote d’Ivoire. It was carried out for two years (2020 and 2021). The experimental design used was a completely randomized block design with three replications. Observations were made on 12 agronomic parameters (plant size, internode size, collar diameter, number of leaves, number of internodes, cob insertion level, cob length, cob diameter, total kernels, cob dry weight, kernel dry weight, yield). The results showed that all agronomic traits of maize were significantly influenced by locality, except for the number of leaves. The highest values of the traits were observed in the locality of Bouaké. However, the year of cultivation did not influence the agronomic parameters of maize. This study will help to avoid yield decreases due to rainfall disturbances as a consequence of climate change.

关键词： Climate Variability Agronomic Parameters Growing Area

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Preliminary Study of Predation Effectiveness of the Assassin Bug Rhynocoris rapax Stal (Heteroptra: Reduviidae) on Fall Armyworm Spodoptera frugiperda Smith (Lepidoptera: noctuidae), a Major Pest of Maize Crops

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Advances in Entomology 2023年第1期11卷 10-17页

作者： Assiénin Hauverset n’guessan Brice Sidoine Essis Achi Laurent n’cho Hugues Annicet n’da Kouamé Jean-noël konan n’guessan Alphonse Kouassi national Centre for Agronomy Research Research Station of La Mé Laboratory of Entomology Abidjan C&ocirc te d’Ivoire national Centre for Agronomy Research Food Crops Research Station Laboratory of Phytopathology Bouaké C&ocirc te d’Ivoire national Centre for Agronomy Research Research Station of Maize Millet and Sorghum Laboratory of Phytopathology Ferkessédougou C&ocirc te d’Ivoire national Centre for Agronomy Research Research Station of Maize Millet and Sorghum Plant Breeding Laboratory Ferkessédougou C&ocirc te d’Ivoire national Centre for Agronomy Research Research Station of La Mé Plant Breeding Laboratory Abidjan C&ocirc te d’Ivoire national Centre for Agronomy Research Research Station of La Mé Soil Science Laboratory Abidjan C&ocirc te d’Ivoire

Maize is a staple food in many sub-Saharan African countries, grown on large surfaces and with high production. However, maize’s cultivation is often confronted with attacks by the fall armyworm, which considerably reduces production. Thus, the use of biological agents in the control of the fall armyworm would contribute effectively to the sustainability of agriculture. It is in this context that this study, conducted at the La Mé station of the national Centre for Agronomy Research, aims to test the effectiveness of Rhynocoris rapax, a powerful predator of various insect families, on the fall armyworm Spodoptera frugiperda, for biological control of this maize pest in Côte d’Ivoire. Therefore, 3 batches of 1 adult individuals of Rhynocoris rapax were captured in trial plots set up at the La Mé station. These individuals were then put in contact with 3 batches of 5, 20 and 40 larvae of the pest in rearing boxes at an average temperature of 26.4°C and an average relative humidity of 60%, in order to evaluate the efficiency of the predation. The results showed that Rhynocoris rapax kills more larvae when these are in large numbers. The mortality of the high number of larvae was observed during the first three days, probably due to the voracity and aggressiveness of Rhynocoris rapax that period. So R. rapax is a potential predator of fall armyworm and should be protected.

关键词： Effectiveness Predation Rhynocoris rapax Spodoptera frugiperda Maize

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Estimation of the Actual Evapotranspiration by the SEBAL Method in the Irrigated Rice Perimeter of Zatta (Yamoussoukro—Côte d’Ivoire)

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Journal of Water Resource and Protection 2023年第10期15卷 539-556页

作者： Junias Léandre Kra Moïse Botou Adahi Brice Arthur konan-Waidhet Jean-Yves konan n’guessan Joël Doyéré Koné Emmanuel nogbou Assidjo department of Geosciences and Environment Université Jean Lorougnon Guédé (UJLoG) Daloa C&ocircte d’Ivoire department of Rural Engineering and Geographical Sciences Institut National Polytechnique Félix Houphou&eumlt-Boigny (INP-HB) Yamoussoukro C&ocircte d’Ivoire department of Chemical and Food Engineering Institut National Polytechnique Félix Houphou&eumlt-Boigny (INP-HB) Yamoussoukro C&ocircte d’Ivoire

In this study, the SEBAL (Surface Energy Balance Algorithm for Land) model was used to map the spatio-temporal distribution of actual evapotranspiration in the Yamoussoukro department (Côte d’Ivoire). Like other regions of the country, the Yamoussoukro district is confronted with the phenomenon of evapotranspiration (ET). This is a very important component that comes into play in the water balance but also in the calculation of the water needs of agricultural crops. Consequently, its estimation is of paramount importance in research related to the rational management of water resources, particularly agricultural water. The objective of this study was to analyze the spatio-temporal distribution of actual evapotranspiration (AET) as a function of land cover and land use. The methodology used is based on the SEBAL model which uses remote sensing (Landsat 8_OLI/TIRS) and climatic data to estimate actual evapotranspiration and analyze the spatio-temporal distribution of AET. The results reveal that the AET varied from 0 to 5.44 mm/day over the period from december 2019 to February 2020 with an average value of 4.92 mm/day. The highest average values occurred for water bodies (4.90 mm/day) and flooded vegetation (4.88 mm/day) while the lowest values occurred in residential areas (2.04 mm/day). Furthermore, the results show that the difference between the SEBAL model and the FAO-Penman-Monteith method is minimal with an average RMSE of 0.36 mm/day for all the satellite images. This study demonstrates the considerable potential of remote sensing for the characterization and estimation of spatial evapotranspiration in the Zatta irrigated rice-growing area.

关键词： Evapotranspiration Water Balance Rational Management Remote Sensing SEBAL Model

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石油中不同环数芳烃化合物的精细分离和制备

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石油实验地质 2021年第3期43卷 524-531页

作者：刘雪李美俊唐友军何大祥 konan n’guessan francois de sales 师生宝朱雷长江大学油气资源与勘探技术教育部重点实验室武汉430100 长江大学资源与环境学院武汉430100 中国石油大学(北京)油气资源与勘探国家重点实验室北京102249 中国石油大学(北京)地球科学学院北京102249

石油族组分的分离和制备过程是后续分子组成、同位素分析的基础。由于同分异构体多,传统技术制备的芳烃化合物组分仍然无法满足单体化合物的同位素分析要求。采用两种不同的分离方案对原油中的多环芳烃进行精细的分离和制备,其中"一步法... 详细信息

石油族组分的分离和制备过程是后续分子组成、同位素分析的基础。由于同分异构体多,传统技术制备的芳烃化合物组分仍然无法满足单体化合物的同位素分析要求。采用两种不同的分离方案对原油中的多环芳烃进行精细的分离和制备,其中"一步法"是直接将脱沥青质的原油样品经过一次氧化铝/硅胶层析柱,用不同体积比的石油醚/二氯甲烷混合溶剂进行洗脱;"两步法"先将原油采用常规的族组分分离方法得到芳烃馏分,再将芳烃馏分经氧化铝层析柱,用不同比例的石油醚/二氯甲烷混合溶剂进行洗脱,可得到不同环数芳烃的组分。对洗脱出来的不同组分进行色谱—质谱分析(GC-MS),与"一步法"相比,"两步法"可以更好地实现单环、双环与三环芳烃化合物的分离制备,其中,石油醚/二氯甲烷(99/1,V/V)的混合溶剂可以制备单环芳烃化合物;石油醚/二氯甲烷(9/1,V/V)混合溶剂可制备得到以双环芳烃化合物占绝对优势的组分;石油醚/二氯甲烷(8/2,V/V)混合溶剂则可制备得到三环芳烃化合物组分。

关键词：石油柱层析分离多环芳烃

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