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Study of Vision Problems in Schools in Libreville and Owendo, Gabon

Open Journal of Pediatrics 2014年第4期4卷 300-306页

作者： Simon Ategbo Jean Koko edgar brice ngoungou Eliane Kuissi Christelle Moyou Tchapbou Steeve Minto’o Emmanuel Mve Mengome André Moussavou Pediatrics Department Faculty of Medecine Health Sciences University Libreville Gabon Department of Epidemiology and Biostatistics Faculty of Medecine Health Sciences University Libreville Gabon Ophtalmology Department Omar Bongo Ondimba Army Instruction Hospital Libreville Gabon

The purpose of this work is to evaluate the epidemiological aspects of vision problems and their repercussions in the schooling of children in Libreville and Owendo. Methodology: This transversal and descriptive study was carried out in May and June 2011. Included in the study were children in the 7th and 8th grades of the primary schools in Libreville and Owendo. For each child, an eye exam, including the subjective measure of visual acuity, was carried out using the Monoyer scale, and the color vision assessment was carried out with the Ishihara test. Any visual capacity under or equal to 7/10th in at least one eye was considered to be pathological. We gathered information about demographic characteristics, any preceding vision issues on the record, data on other medical problems on the record and the eye examination on computer cards. Results: Nine hundred and sixty-three children (416 boys and 517 girls, with a gender ratio of 0.86) were examined. The average age was 12 ± 1.7 years old. The prevalence of the drop in visual acuity was 16.2%. The prevalence of color vision anomalies was 15.5%. Complaints concerning vision problems were significantly more present from children with a drop in visual acuity (p 0.01). Visual anomalies had an impact on the children’s schoolwork, and yet, visits to the ophthalmologist’s office were few. Conclusion: The frequency of anomalies in vision justifies systematic screening in schools and organization of an appropriate treatment.

关键词： Visual Acuity Children Schools Color Vision

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Management and Development of Newborns from Mothers Carrying HBsAg at the El Rapha Polyclinic in Libreville, Gabon

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Open Journal of Pediatrics 2021年第3期11卷 468-478页

作者： Eliane Kuissi Kamgaing Steeve Minto’o Rogombe Aude-Mariella Lembet Mikolo Raïssa Koumba Maniaga Edmée Mintsa Mi Nkama edgar-brice ngoungou Maiga Aité Blaise Okissi Marcelle Djiomo Simon Ategbo Polyclinique El Rapha Libreville Gabon Département de Pédiatrie Université des Sciences de la Santé (USS) Libreville Gabon Department of Biostatistics Université des Sciences de la Santé (USS) Libreville Gabon

Introduction: Hepatitis B is a significant public health problem. Infected children Objective: We aimed to assess newborns’ management and outcome from reactive HBs Ag mothers at the El Rapha Polyclinic in Libreville, Gabon. Methodology: Prospective longitudinal study, carried out over four years, including all neonates born from reactive HBsAg mothers admitted in the delivery room. The parameters studied were maternal age, gestation, marital status, pregnancy follow-up, hepatitis B vaccination status, knowledge of hepatitis B, anti-Hbc antibodies’ levels, HBeAg. For the newborn: term, birth weight, management at birth, and hepatitis B serological status at 12 months. Results: We included 45 newborns. Mothers’ mean age was 30.9 ± seven years. In 32.6% of cases, antenatal consultations were ≤4, and 9.3% were vaccinated for hepatitis B. Mothers had chronic hepatitis in 74.4% of cases. All neonates were vaccinated for hepatitis B at birth;68.9% received hepatitis B immunoglobulin. At 12 months, 77.8% had HBs antibody positive, and 6.7% were HBsAg positive. Conclusion: Hepatitis B prevalence is significant among parturients. It is essential to set up a national strategy for managing the mother-child couple in a context of positive HBsAg.

关键词： Viral Hepatitis B Newborn Management Evolution Gabon

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Governance in the exploration of global and regional determinants of ICT development

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International Journal of Innovation Studies 2024年第2期8卷 132-153页

作者： Charles S.Saba Simplice A.Asongu Nicholas Ngepah Yolande E.ngoungou School of Economics College of Business and EconomicsUniversity of JohannesburgJohannesburgSouth Africa Department of Econornic&Data Science New Uzbekistan University54 Mustaili AvenueTashkent100007Uzbekistan University of Yaounde 2 SoaCameroon

The present study assesses how governance affects information and communication technology(IcT)at the global level contingent on macroeconomic policy factors such as trade,foreign direct investment(FDI),manufacturing value added,and agricultural value *** study focuses on 183 countries from 2003 to 2021,and the empirical evidence is based on the generalized method of moments(GMM).The following main findings are *** the full sample,governance unconditionally promotes ICT development,while trade openness(industrial added value)moderates governance to promote(dampen)ICT *** sub-Saharan Africa,only trade openness effectively moderates governance to induce an overall positive effect on ICT,while in the Middle East and North Africa(MENA)region,all policy variables moderate governance for an overall positive incidence on ICT sector *** findings for the MENA region are confirmed in the Europe and Central Asia(ECA)region,with the exception of the moderating role of industrial added value,which engenders an overall negative *** the East and South Asia and the Pacific(ESAP)countries,one overall positive incidence is apparent in the role of trade openness,while net negative effects are established from the moderating roles of industrial added value and agricultural added *** the American sub-sample,a positive(negative)net effect is apparent from the role of industrial added value(trade)in moderating the incidence of gover-nance on ICT sector ***,policy implications are discussed.

关键词： ICT Governance Trade FDI Industry Agriculture

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Controllable multi-domain semantic artwork synthesis

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Computational Visual Media 2024年第2期10卷 355-373页

作者： Yuantian Huang Satoshi Iizuka edgar Simo-Serra Kazuhiro Fukui Department of Computer Science University of TsukubaTsukuba 305-8577Japan Department of Computer Science and Engineering Waseda UniversityTokyo 169-8050Japan

We present a novel framework for the multidomain synthesis of artworks from semantic *** of the main limitations of this challenging task is the lack of publicly available segmentation datasets for art *** address this problem,we propose a dataset called ArtSem that contains 40,000 images of artwork from four different domains,with their corresponding semantic label *** first extracted semantic maps from landscape photography and used a conditional generative adversarial network(GAN)-based approach for generating high-quality artwork from semantic maps without requiring paired training ***,we propose an artwork-synthesis model using domain-dependent variational encoders for high-quality multi-domain ***,the model was improved and complemented with a simple but effective normalization method based on jointly normalizing semantics and style,which we call spatially style-adaptive normalization(SSTAN).Compared to the previous methods,which only take semantic layout as the input,our model jointly learns style and semantic information representation,improving the generation quality of artistic *** results indicate that our model learned to separate the domains in the latent ***,we can perform fine-grained control of the synthesized artwork by identifying hyperplanes that separate the different ***,by combining the proposed dataset and approach,we generated user-controllable artworks of higher quality than that of existing approaches,as corroborated by quantitative metrics and a user study.

关键词： semantic artwork synthesis generative adversarial network(GAN) datasets non-photorealistic rendering

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Assessment of compressive strength of jet grouting by machine learning

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 102-111页

作者： Esteban Diaz edgar Leonardo Salamanca-Medina Roberto Tomas Departamento de Ingeniería Civil Escuela Politécnica SuperiorUniversidad de AlicanteP.O.Box 99E-03080AlicanteSpain

Jet grouting is one of the most popular soil improvement techniques,but its design usually involves great uncertainties that can lead to economic cost overruns in construction *** high dispersion in the properties of the improved material leads to designers assuming a conservative,arbitrary and unjustified strength,which is even sometimes subjected to the results of the test *** present paper presents an approach for prediction of the uniaxial compressive strength(UCS)of jet grouting columns based on the analysis of several machine learning algorithms on a database of 854 results mainly collected from different research *** selected machine learning model(extremely randomized trees)relates the soil type and various parameters of the technique to the value of the compressive *** the complex mechanism that surrounds the jet grouting process,evidenced by the high dispersion and low correlation of the variables studied,the trained model allows to optimally predict the values of compressive strength with a significant improvement with respect to the existing ***,this work proposes for the first time a reliable and easily applicable approach for estimation of the compressive strength of jet grouting columns.

关键词： Jet grouting Ground improvement Compressive strength Machine learning

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Free-range poultry eggs as an emerging tool for pollution bio-indication

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Eco-Environment & Health 2024年第1期3卷 77-79页

作者： Anissa Zergui Daniel brice Nkontcheu Kenko National Center of Toxicology Algeria Zoology Laboratory Department of Animal Biology and ConservationFaculty of ScienceUniversity of BueaCameroon Biology and Applied Ecology Research Unit Dschang School of Science and TechnologyUniversity of DschangCameroon

Environmental pollution disrupts aquatic and terrestrial ecosystems,constituting a risk to the human survival due to the harmful effects of different pollutants,including heavy metals,persistent organic pollutants(POPs),and ***,long-term exposure to cadmium(Cd)causes kidney damage,bone fragility,and ***(Pb)and mercury(Hg)are known for their haematotoxic and neurotoxic ***(As)can cause skin cancer,hyperkeratosis lesions,skin pigmentation disorders,as well as lung cancer[1].Additionally,POPs,such as organochlorine pesticides(OCPs)and dioxins,are a class of carbon-based organic chemicals characterized by their persistence,bioaccumulation,and potential for long-range *** substances are recognized as hazardous pollutants and endocrine disruptors[2].Because of this evidence,efforts are made to assess environmental pollution in order to guarantee a balanced ecosystem and human *** monitoring traditionally involved directly measuring pollutantlevels in the environmentalmatrices,including air,soil,and water.

关键词： pollution poultry traditionally

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Insight into the Origin of Iron Ore Based on Elemental Contents of Magnetite and Whole-Rock Geochemistry:A Case of the Bipindi Banded Iron Formations,Nyong Complex,SW Cameroon

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Journal of Earth Science 2024年第1期35卷 16-28页

作者： Landry Soh Tamehe Huan Li Sylvestre Ganno Zuxing Chen Yanick brice Lemdjou Safiyanu Muhammad Elatikpo School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Department of Earth Sciences University of Yaounde IYaounde 3412Cameroon Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Department of Geology Ahmadu Bello University ZariaZaria 810107Nigeria

The Bipindi iron ore district is located in the central section of the Nyong Complex at the northwestern margin of the Congo Craton in Southwest *** iron district contains numerous iron mineralization hosted by the Mewongo,Bibole,Kouambo,and Zambi banded iron formations(BIFs).These BIFs contain magnetite as the main iron ore mineral associated with pyrite,and gangue minerals are quartz with minor chlorite and *** origin of iron ore from these BIFs was investigated using a combination of in-situ magnetite and whole-rock *** studied BIF ore samples have a narrow range of TFe between 30.90 wt.%and 43.20 wt.%,indicating a low-grade *** geochemical signatures of magnetite such as low contents of base metals(e.g.,Cu,Co,V,and Zn)and low Co/Zn ratios600 and>75,respectively),we suggest that magnetite was derived from a mixture of seawater and~0.1%low-temperature hydrothermal fluids in an oxidizing ***,low-temperature hydrothermal and later metamorphic fluids were necessary for the transformation of the protolith Nyong Complex BIFs to iron ore.

关键词： banded iron formations iron ore geochemistry Congo Craton trace element composition LA-ICP-MS

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Numerical evaluations on the fluid production in the in-situ conversion of continental shale oil reservoirs

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Petroleum Science 2024年第4期21卷 2485-2501页

作者： Zhao-Bin Zhang Maryelin Josefina brice?o Montilla Shou-Ding Li Xiao Li Jian-Peng Xing Yan-Zhi Hu Key Laboratory of Shale Gas and Geoengineering Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Earth Sciences Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Institute of Energy Peking University

In-situ conversion presents a promising technique for exploiting continental oil shale formations,characterized by highly fractured organic-rich rock. A 3D in-situ conversion model, which incorporates a discrete fracture network, is developed using a self-developed thermal-flow-chemical(TFC) *** of the model elucidates the in-situ conversion process in three stages and defines the transformation of fluids into three distinct outcomes according to their end stages. The findings indicate that kerogen decomposition increases fluid pressure, activating fractures and subsequently enhancing permeability. A comprehensive analysis of activated fracture permeability and heating power reveals four distinct production modes, highlighting that increasing heating power correlates with higher cumulative fluid production. Activated fractures, with heightened permeability, facilitate the mobility of heavy oil toward production wells but hinder its cracking, thereby limiting light hydrocarbon ***, energy efficiency research demonstrates the feasibility of the in-situ conversion in terms of energy utilization, especially when considering the surplus energy from high-fluctuation energy sources such as wind and solar power to provide heating.

关键词： In-situ conversion Continental shale oil Natural fracture network TFC model

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Machine learning in liver surgery:Benefits and pitfalls

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World Journal of Clinical Cases 2024年第12期12卷 2134-2137页

作者： Rafael Calleja Manuel Durán María Dolores Ayllón Ruben Ciria Javier briceño Hepatobiliary Surgery and Liver Transplantation Unit Hospital Universitario Reina SofíaMaimonides Biomedical Research Institute of CordobaCórdoba 14004Spain

The application of machine learning(ML)algorithms in various fields of hepatology is an issue of ***,we must be cautious with the *** this letter,based on a published ML prediction model for acute kidney injury after liver surgery,we discuss some limitations of ML models and how they may be addressed in the *** the future faces significant challenges,it also holds a great potential.

关键词： Machine learning Liver surgery Artificial intelligence Random forest Prediction model

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Unveiling the time-temperature dependence of metastability of supercooled liquid using nano-calorimetry

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 119-127页

作者： Yijun Ding Lijian Song Zheng Wang Ruiqi Yu Junqiang Wang Lina Hu Yuanzheng Yue edgar D.Zanotto Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong University Jinan 250061China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Key Laboratory of Experimental Teratology Shandong University Jinan 250061 China Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Department of Materials Engineering Federal University of Sao CarlosSao Carlos SP 13.565-905Brazil

There is a lack of understanding of both the conversion of an unstable glass into a metastable supercooled liquid(MSL) upon heating and the metastability of MSLs. In this study, we investigated the time-and temperature-dependent metastability of an MSL using an advanced nano-calorimetric technique. The chosen Au-based metallic glass(Au MG) allowed adequate probing of its MSL in a temperature range between 10 and 70 K above the standard glass transition temperature. We found that the survival time of the MSL state is a quadratic function of temperature. Beyond this duration threshold, the sample undergoes fast crystallization even if it is below the crystallization temperature that is measured using differential scanning *** transmission electron microscopy, we observed the formation of clusters with a partially ordered lattice structure during relaxation in the Au MG sample fabricated using a nano-calorimeter. The atomic ordering within the clusters was enhanced by increasing time and temperature in the MSL region. Once the as-produced glass entered the MSL stage upon heating followed by a quenching stage at a given rate, the mechanical properties of the quenched glass remained the same regardless of its holding temperature and duration within the MSL region. This work provides insights into the glass-MSL-crystal transformation and offers guidance for designing standard metallic glasses for property characterizations.

关键词： metallic glass supercooled liquid relaxation nucleation nano calorimetric technology

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