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Land use impact on clay dispersion/flocculation in irrigated and flooded vertisols from Northern Cameroon

International Soil and Water Conservation Research 2018年第3期6卷 237-244页

作者： Simon Djakba Basga DésiréTsozue Jean Pierre Temga jules balna Jean Pierre Nguetnkam Institute of Agricultural Research for Development(IRAD) P.O.Box33MarouaCameroon Department of Earth Sciences Faculty of ScienceUniversity of MarouaP.O Box814MarouaCameroon Department of Earth Sciences Faculty of ScienceUniversity of Yaoundé1P.O Box812YaoundéCameroon Department of Earth Sciences Faculty of ScienceUniversity of NgaoundéréP.O Box454NgaoundéréCameroon

Clay dispersion by water is important for soil and water conservation as well as for irrigation scheduling. In the present study, clay dispersion/flocculation of irrigated and flooded vertisols in North Cameroon was investigated using clay dispersion/stability indices. Nine vertisols topsoils (0–20 cm) samples were collected on different land use and their clay dispersion indices were assessed. Vertisols were acidic to slightly basic, with smectites as dominant clay mineral. The water dispersible clay (160–340 g kg-1), the dispersion ratio (0.55–0.79) and the clay dispersion ratio (0.48–0.83) were high in the studied vertisols while the clay flocculation index (0.17–0.54) and the clay aggregation (70–230 g kg-1) were low to moderate, indicating their high dispersion. Cropped vertisols displayed the higher amount of water dispersible clay while not cropped recorded the smaller amount. Concerning the cropped soils, irrigated vertisols displayed the highest clay dispersion indices suggesting that agricultural practices (irrigation) enhance clay dispersion. Globally, the clay dispersibility trend was: irrigated paddy ? rainy sorghum ? rainfed paddy ? dry-season sorghum ? not cropped. Statistical analyses revealed that amorphous Al, Na+ and electrical conductivity enhance clay dispersion while organic matter, nitrogen and Ca++ promote clay flocculation/aggregation. The overall findings emphasized that practices such as heavy tillage and irrigation induce clay dispersion. Minimum tillage, electrolytes concentration monitoring in irrigation water, irrigation scheduling based on soil moisture control, organic matter inputs and implementation of adapted dams are measures susceptible to limit their degradation through clay dispersion.

关键词： Vertisols Clay dispersion Irrigation Land use North Cameroon

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Eco-friendly polysaccharide coatings for antifouling and dragreduction and potential application for marine devices

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Friction 2024年第4期12卷 726-744页

作者： Hao YANG Liguo QIN Wenhui ZHAO Fagla jules MAWIGNON Hui GUO Yongkang WU Yali ZHANG Guangneng DONG Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Institute of Design Science and Basic ComponentsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Biomedical Information of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Department of Endocrinology First Affiliated Hospital of Medical CollegeXi'an Jiaotong UniversityXi’an 710061China

Traditional antifouling agents usually have a certain toxic effect on marine environments and non-target *** this study,Dictyophora indusiata polysaccharide(DIP)was applied as a natural antifouling surface modifier to prepare the surface coating for marine *** DIP coatings were prepared:*** spore polysaccharide(DISP),*** volva polysaccharide(DIVP),and *** embryonic body polysaccharide(DIEP).The antifouling,tribological,and anticorrosion behavior of the coatings were *** revealed that the three kinds of DIP coatings had excellent antifouling properties,which could effectively prevent the adhesion of Chlorella and the attachment of water-based and oily stains on the ***,the coatings showed great mechanical stability and could maintain an extremely low coefficient of friction(COF<0.05)after continuous *** drag reduction rate of the coated surfaces reached 5%,showing a powerful lubrication ***,the DIP coatings presented an outstanding corrosion resistance,where the equivalent circuit impedances were 4-9 orders of magnitude higher than the control *** research showed a promising prospect of surface coating fabrication with DIP for marine devices to achieve the purpose of antifouling and drag reduction.

关键词： Dictyophora indusiata polysaccharide(DIP)coating antifouling anticorrosion lubrication and drag reduction

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Dynamics analysis and cryptographic implementation of a fractional-order memristive cellular neural network model

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Chinese Physics B 2024年第4期33卷 418-433页

作者：周新卫蒋东华 Jean De Dieu Nkapkop Musheer Ahmad jules Tagne Fossi Nestor Tsafack 吴建华 Department of Information Engineering Gongqing CollegeNanchang UniversityJiujiang 332020China School of Computer Science and Engineering Sun Yat-Sen UniversityGuangzhou 511400China Department of Electrical Engineering and Industrial Computing University Institute of TechnologyDoualaCameroon Department of Computer Engineering Jamia Millia IslamiaNew Delhi 110025India Department of Physics Faculty of ScienceUniversity of YaoundeCameroon Electrical Engineering Department and Industrial Computing of ISTAMA University of DoualaDoualaCameroon

Due to the fact that a memristor with memory properties is an ideal electronic component for implementation of the artificial neural synaptic function,a brand-new tristable locally active memristor model is first proposed in this ***,a novel four-dimensional fractional-order memristive cellular neural network(FO-MCNN)model with hidden attractors is constructed to enhance the engineering feasibility of the original CNN model and its ***,its hardware circuit implementation and complicated dynamic properties are investigated on multi-simulation ***,it is used toward secure communication application *** it as the pseudo-random number generator(PRNG),a new privacy image security scheme is designed based on the adaptive sampling rate compressive sensing(ASR-CS)***,the simulation analysis and comparative experiments manifest that the proposed data encryption scheme possesses strong immunity against various security attack models and satisfactory compression performance.

关键词： cellular neural network memristor hardware circuit compressive sensing privacy data protection

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Exactly Solvable Two-Parameter Models of Relativistic δ′s -Sphere Interactions in Quantum Mechanics

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Journal of Applied Mathematics and Physics 2024年第4期12卷 1263-1285页

作者： jules Manirambona Juma Shabani Alfred Vyabandi Doctoral School University of Burundi Bujumbura Burundi Faculty of Sciences Doctoral School University of Burundi Bujumbura Burundi Institute of Applied Pedagogy University of Burundi Bujumbura Burundi

We make a systematic study of two-parameter models of δ ′ s -sphere interaction and δ ′ s -sphere plus a Coulomb interaction. Where δ ′ s interaction denotes the δ ′ -sphere interaction of the second kind. We provide the mathematical definitions of Hamiltonians and obtain new results for both models, in particular the resolvents equations, spectral properties and some scattering quantities.

关键词： Boundary Conditions Problem -Sphere Interactions Self-Adjoint Operator Resolvent Equation Spectral Properties Scattering Theory

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Movement analysis in the diagnosis and management of Parkinson’s disease

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Neural Regeneration Research 2025年第2期20卷 485-486页

作者： Johannes Burtscher Nicolas Bourdillon jules MJanssen Daalen Aurélien Patoz Julien FBally Martin Kopp Davide Malatesta Bastiaan RBloem Institute of Sport Sciences University of LausanneLausanneSwitzerland Radboud University Medical Center Department of NeurologyDonders Institute for BrainCognition and BehaviorCenter of Expertise for Parkinson and Movement DisordersNijmegenThe Netherlands Radboud University Medical Center Department of Medical BioSciencesNijmegenThe Netherlands Research and Development Department Volodalen Swiss Sport LabAigleSwitzerland Service of Neurology Department of Clinical NeurosciencesLausanne University Hospital(CHUV)and University of Lausanne(UNIL)LausanneSwitzerland Department of Sport Science University of InnsbruckInnsbruckAustria

Challenges in the diagnosis and treatment of Parkinson’s disease:Parkinson’s disease(PD)is an increasingly prevalent neurodegenerative disease,at first sight primarily characterized by motor symptoms,although non-motor symptoms also constitute a major part of the overall ***,this disease cannot be diagnosed reliably until a large part of the vulnerable dopaminergic neurons has been irretrievably lost,and the disease progresses *** biological criteria for PD have been proposed recently and might eventually improve early diagnosis,but they require further validation,and their use will initially be restricted to a research environment(Darweesh et al.,2024).

关键词： diagnosis Clinical eventually

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解密德佑湿厕纸的产品升级战略

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生活用纸 2024年第5期24卷 29-32页

作者： jules 诸葛定位咨询有限公司

在湿厕纸行业风起云涌的2023年,德佑品牌以雷霆之势成为引领市场的新领袖。这背后,是德佑深思熟虑、步步为营的战略布局。2023年5月,德佑携手第一财经商业数据中心,发布了《2023湿厕纸行业趋势白皮书》,这一举动不仅彰显了德佑在湿厕纸... 详细信息

在湿厕纸行业风起云涌的2023年,德佑品牌以雷霆之势成为引领市场的新领袖。这背后,是德佑深思熟虑、步步为营的战略布局。2023年5月,德佑携手第一财经商业数据中心,发布了《2023湿厕纸行业趋势白皮书》,这一举动不仅彰显了德佑在湿厕纸行业的领先地位,更是其抢占行业话语权的重要一步。然而,就在同年的12月,湿厕纸市场的新贵——马应龙药业,也联合智篆©和清渠数据发布了《2023年湿厕纸新消费趋势白皮书》,意图在湿厕纸市场中分得一杯羹。如今,德佑品牌在湿厕纸市场的地位虽然稳固,但马应龙药业携“肛肠治痔”功效概念进军湿厕纸市场,其野心不言而喻。马应龙药业是否会像云南白药一样,在消费者心智中成功植入其功效概念,从而夺走德佑品牌湿厕纸市场的领先地位?这是一个值得密切关注的动向。为了深入了解德佑品牌的成功秘诀及其未来的发展前景,有必要对其战略决策进行了解,探寻其品牌发展和产品升级战略。

关键词：行业趋势成功秘诀消费趋势数据中心消费者心智数据发布战略决策云南白药

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Comparative Study of Probabilistic and Least-Squares Methods for Developing Predictive Models

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Open Journal of Applied Sciences 2024年第7期14卷 1775-1787页

作者： Boribo Kikunda Philippe Thierry Nsabimana jules Raymond Kala Jeremie Ndikumagenge Longin Ndayisaba Centre de Recherche en Infrastructure Environnement et Technologie (CRIET) Faculty of Engineering Sciences Universit du Burundi Bujumbura Burundi Faculty of Sciences Universit Catholique de Bukavu (UCB) Bukavu DR Congo Management Computer Department Institut suprieur Pdagogique de bukavu (ISP/Bukavu) Bukavu DR Congo

This article explores the comparison between the probability method and the least squares method in the design of linear predictive models. It points out that these two approaches have distinct theoretical foundations and can lead to varied or similar results in terms of precision and performance under certain assumptions. The article underlines the importance of comparing these two approaches to choose the one best suited to the context, available data and modeling objectives.

关键词： Predictive Models Least Squares Bayesian Estimation Methods

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Comparative Study of the Widal Test against Stool Culture in the Diagnosis of Suspected Cases of Typhoid Fever in Some Low Income Communities in the Adamawa Region of Cameroon

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Journal of Biosciences and Medicines 2024年第6期12卷 178-190页

作者： Mariane Lucie Ngueguim Bernard Viban Tangwa Victor Ngu Ngwa jules Romain Ngueguim Abdoulmoumini Mamoudou School of Veterinary Medicine and Sciences University of Ngaoundere Ngaoundere Cameroon Department of Veterinary Medicine University of Buea Buea Cameroon Institute de Recherhe Agricole pour le Development (IRAD) Ngaoundere Cameroun

Introduction: Infectious diseases constitute a major concern of public health in developing countries. Facilities and well trained staff have been shown to be one of the major obstacles in the rapid and quality diagnosis of these diseases. As such, we carried out an analysis to compare the Widal test and stool culture to identify febrile patients with Salmonella infection. Method: A cross sectional study was conducted to diagnose salmonella infection with out-patients who demonstrated signs of salmonella infection. Serum was harvested from blood collected from 368 (Vina = 234, Mayo Banyo 65, and Djerem = 69) patients accompanied by stool, Widal test was conducted on the spot and stool was taken to a reference laboratory for culture using standard microbiological methods, sociological set up was calculated in percentages, prevalence was calculated using excel while statistical difference was calculated using SPSS. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were calculated to compare the Widal test against stool culture. Results: A total of 368 (50.8% females and 49.2% males) participants took part in the survey. Salmonella prevalence (66.24%) in stool culture in the Vina division was significantly different (p 0.05). The sensitivity,specificity, PPV, and NPV of slide agglutination test against stool culture varied from different areas (Vina: 51.6%, 73.62%, 79.21% and 43.61%;Mayo Banyo: 60.53%, 77.78%, 79.31% and 58.33%;Djerem: 53.18%, 83.73% 73.91% and 67.39%) respectively. Slide agglutination test has a fair agreement with the stool culture (kappa, Vina = 0.202;Mayo Banyo = 0.37 and Djerem = 0.38). Conclusion: Generally, in the three areas of study, the Widal test had a fair correlation with the stool culture;This means the Widal test should not be used alone but in combination with stool culture in the detection of salmonella infections.

关键词： Salmonella Infections Stool Culture Widal Test Adamawa Region Cameroon

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Analysis of Public Sentiment regarding COVID-19 Vaccines on the Social Media Platform Reddit

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Journal of Computer and Communications 2024年第2期12卷 80-108页

作者： Lucien Dikla Ngueleo jules Pagna Disso Armel Ayimdji Tekemetieu Justin Moskolaï Ngossaha Michael Nana Kameni African Institute for Mathematical Sciences (AIMS)/AIMS-Cameroon Limbe Cameroon Department of Mathematics and Computer Science Faculty of Science University of Douala Douala Cameroon WMG (Warwick Manufacturing Group) University of Warwick Coventry UK School of Information Studies McGill University Montreal Canada

This study undertakes a thorough analysis of the sentiment within the r/Corona-virus subreddit community regarding COVID-19 vaccines on Reddit. We meticulously collected and processed 34,768 comments, spanning from November 20, 2020, to January 17, 2021, using sentiment calculation methods such as TextBlob and Twitter-RoBERTa-Base-sentiment to categorize comments into positive, negative, or neutral sentiments. The methodology involved the use of Count Vectorizer as a vectorization technique and the implementation of advanced ensemble algorithms like XGBoost and Random Forest, achieving an accuracy of approximately 80%. Furthermore, through the Dirichlet latent allocation, we identified 23 distinct reasons for vaccine distrust among negative comments. These findings are crucial for understanding the community’s attitudes towards vaccination and can guide targeted public health messaging. Our study not only provides insights into public opinion during a critical health crisis, but also demonstrates the effectiveness of combining natural language processing tools and ensemble algorithms in sentiment analysis.

关键词： COVID-19 Vaccine TextBlob Twitter-RoBERTa-Base-Sentiment Sentiment Analysis Latent Dirichlet Allocation

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Analysis of the Quality of Physical and Chemical Parameters of Groundwater in Three Localities in the Sub-Prefecture of Zanzra (Ivory Coast)

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 1-17页

作者： Djedjess Essoh jules-César Meledje Bi Irié Marc Gouli Drissa Ouattara Kra Vanh Eric-Simon Zran Adjourma Konate Albert Trokourey Laboratoire de Chimie des Eaux (LCE) de l’ Ecole Normale Sup&#233rieure d&#8217Abidjan Abidjan C&#244te d&#8217Ivoire Laboratoire de Constitution et Ré action de la Mati&#232re (LCRM) &#224 l&#8217UFR SSMT-Universit&#233 F&#233lix Houphou&#235t-Boigny (UFHB) de Cocody Abidjan C&#244te d&#8217Ivoire

The availability of groundwater of acceptable quality has become a difficult challenge to meet in many countries, particularly Côte d’Ivoire. The State of Côte d’Ivoire and rural populations are building hydraulic infrastructure for this purpose. However, the quality of water coming from these infrastructures remains to be determined. This study therefore aims to analyze certain physicochemical parameters of the groundwater of Gloazra, Kouezra and Trahonfla. These are temperature, pH, electrical conductivity, TDS, salinity level, hardness, alkalinity, chloride content and bicarbonate. To determine the pH, electrical conductivity, temperature, TDS, and salinity rate, an electrochemical analysis was carried out. The titrimetric analysis made it possible to determine the chloride and bicarbonate content, alkalinity, and hardness. The results indicate that the studied groundwater is soft and acidic with good mineralization. This water does not present a health hazard to consumers but can affect hydraulic equipment and household containers.

关键词： Ivory Coast Gloazra Trahonfla Kouezra Physicochemical Parameters Water WHO Standards

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