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Impact and Factors Associated with Presbycusis among 50 Years Old People of Parakou and Over in 2021

International Journal of Otolaryngology and Head & Neck Surgery 2022年第1期11卷 56-73页

作者： Marius Claude Flatin Alexis AWC do Santos Zounon Cocouvi Bruno Ametonou Fatiou Alabi Bouraima Mé ré roland kimba Spé ro HR Hounkpatin Wassi Adjibabi Bernadette Vignikin-Yehouessi Faculté de Mé decine Universit&#233 de Parakou Parakou B&#233 nin Centre Hospitalier Universitaire et Dé partemental Borgou Parakou B&#233 nin Faculté des Sciences de la Santé Universit&#233 d’Abomey Calavi Cotonou B&#233 nin

Introduction: Presbycusis or age-related hearing loss is a condition of in-sidious onset with significant socio-professional repercussions. The objec-tive of this study was to determine the impact and factors associated with presbycusis among 50 years aged people or older in Parakou commune during 2021. Methods: This was a cross-sectional, descriptive, analytical study with prospective data collection. The study has involved 541 50 years aged people or older, from February to May 2021. For each of them, a questionnaire was completed, otoscopy and tone audiometry performed. The ERSA questionnaire and the logistic regression model were used to determine the impact and factors associated with presbycusis. Results: The mean age was 59.48 ± 9.80 years and the sex ratio was 1.23. The prevalence of presbycusis was 50.28%. Age ≥ 80 years (p = 0.002), male sex (p = 0.016), low educational level (p = 0.001), family history of age-related hearing loss (p = 0.018) and presence of hearing loss (p = 0.001) were significantly associated with presbycusis in multivariate analysis. Of the life domains studied, personal life (mean score = 32.9 ± 10.52) was the most affected. Similarly, communication in a noisy environment (mean score = 4.39 ± 2.39) was the most affected aspect of personal life. Conclusion: Presbycusis leads to an impairment of personal life. A good knowledge of the associated factors and an early management could contribute to the improvement of the hearing health of the elderly.

关键词： Presbycusis Elderly Hearing Deafness

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Cooperative file sharing mechanism with Network Coding in wireless Mesh networks

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The Journal of China Universities of Posts and Telecommunications 2009年第1期16卷 1-8页

作者： kimba DIT ADAMOU Boubacar ZOU Shi-hong ABDOU Saley MA Yi-hui CHENG Shi-duan School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China MAC Engineering Inc. Canada T2S OCT

This article describes a new model of a cooperative file sharing system in a wireless Mesh network. The authors＇ approach is to develop an efficient and cooperative file sharing mechanism based on opportunistic random linear Network Coding. Within this mechanism, every node transmits random linear combination of its packets according to cooperative priority, which is computed in a distributed manner according to the node-possible contribution to its neighbor nodes. With this mechanism, the more a node contributes to others, the more the node has chances to recover the entire file first. The performance metrics of interest here are： the delay until all the packets in a file have been delivered to all nodes, and an ideal packet size, by the use of which the authors can get the minimum transmission delay. Through extensive simulation the authors compare their mechanism with the current transmission process in a wireless Mesh network without random linear Network Coding. The authors found that using their mechanism, the nodes can cooperatively share the entire file with less transmission time and delay than the current transmission process without random linear network.

关键词： wireless Mesh network Network Coding file sharing

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Acute lung injury and ARDS in acute pancreatitis: Mechanisms and potential intervention

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World Journal of Gastroenterology 2010年第17期16卷 2094-2099页

作者： roland Andersson Department of Surgery Clinical Sciences LundLund University Lund University Hospital SE-221 85 LundSweden

Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) in acute pancreatitis still represents a substantial problem,with a mortality rate in the range of 30%-40%.The present review evaluates underlying pathophysiological mechanisms in both ALI and ARDS and potential clinical *** mediators and pathophysiological pathways are involved during the different phases of ALI and *** initial exudative phase is characterized by diffuse alveolar damage,microvascular injury and influx of inflammatory *** phase is followed by a fibro-proliferative phase with lung repair,type Ⅱ pneumocyte hypoplasia and proliferation of *** derived from polymorphonuclear neutrophils,various pro-inflammatory mediators,and phospholipases are all involved,among *** factors that promote pancreatitis-associated ALI may be found in the gut and mesenteric *** is a lack of complete understanding of the underlying mechanisms,and by improving our knowledge,novel tools for prevention and intervention may be developed,thus contributing to improved outcome.

关键词： Acute lung injury Acute respiratory distress syndrome Acute pancreatitis Etiology Pathophysiology

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Long-term monitoring of PCDD/PCDF and other unintentionally produced POPs-Concepts and case studies from Europe

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Science China Chemistry 2010年第5期53卷 1017-1024页

作者： REINMANN Jürgen WEBER roland HAAG roland Environnement S.A Deutschland Benzstrasse 1161352 Bad HomburgGermany POPs Environmental Consulting Ulmenstraβe 373035 GppingenGermany TüV Süd Industrie Service GmbH Grabenwiesenstraβe 473072 DonzdorfGermany

During the start-up and unstable combustion periods,even the state-of-the-art incinerators emit polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/PCDF) in stack gases at concentrations that are up to 1000 times higher than normal operation. Therefore,incinerators and other sources with variation of PCDD/PCDF release into air cannot be reliably monitored by the conventional short-term sampling that covers only 0.1%to 0.2%of the yearly operating time.A more comprehensive monitoring regime is *** paper describes different applications of continuous PCDD/PCDF sampling in some European *** cases demonstrate that flexible regimes for continuous sampling can be crafted and applied by governments or regional/local *** regimes range from a countrywide,continuous requirement for selected facility types(e.g.,waste incinerators) to a facility-specific regime that applies,for example,to new facilities for a defined time period until the facility has demonstrated continuous compliance with regulatory limits. Countries implementing the Stockholm Convention are suggested to evaluate in their Best available technology/Best environmental practice(BAT/BEP) activities the usefulness of long-term sampling by,for example,designating institutes related to the environmental ministry or regional authorities to supervise long-term sampling regimes at relevant facilities in their country/areas,beginning with priority sources(e.g.,facilities used for destruction of persistent organic pollutants(POPs) or hazardous waste processing) . This paper presents and discusses the results of the AMESA long-term monitoring system having demonstrated that in addition to PCDD/PCDF all other unintentionally produced POPs listed in the Stockholm Convention could be supervised.

关键词： PCDD/PCDF PCB continuous sampling unintentionally produced POPs Stockholm Convention BAT/BEP

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Liquid-phase epitaxy of metal organic framework thin films

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Science China Chemistry 2011年第12期54卷 1851-1866页

作者： FISCHER roland A. Organometallics and Materials Chemistry Ruhr-Universitt Bochum

Metal-organic framework(MOF) thin films are multilayer materials ranging from nanometers to micrometers in thickness,physically or chemically adhesive to a(functionalized) substrate and,in an ideal case,exhibiting low roughness and high *** innovative approaches have been developed for MOF thin film *** these advanced materials,surface-attached metal-organic frameworks(SURMOFs) are an important class of MOF ***,fabricated in a step-by-step liquid phase epitaxial(LPE) fashion by alternating deposition of metal and organic linker precursors on a functionalized substrate,for example,thiolate-based self-assembled monolayers(SAMs),have already exhibited their utility in both research and potential *** combine surface science and the chemistry of MOFs,possessing the following unique advantages that cannot be accessed through other methods:(i) precisely controlling thickness,roughness and homogeneity as well as growth orientation,(ii) studying of MOF growth mechanism,(iii) modifying/tailoring MOFs' structures during the SURMOF growth and thus creating customizable properties,and(iv) existing in the form of thin film/membrane for direct applications,for example,as *** review discusses the oriented and crystalline SURMOFs fabricated by LPE approach,covering their preparation,growth mechanism,and characterization methodology as well as applications based upon the most newly updated knowledge.

关键词： coordination chemistry metal-organic frameworks (MOFs) liquid phase epitaxy step-by-step approach surface science thin film

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Mobile Internet Applications：Impact on Future Wireless Communications System

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China Communications 2012年第4期9卷 20-25页

作者： Gao Youjun Yang Ning Cui Chunfeng kimba Dit Adamou Boubacar Department of Wireless Technology Research China Mobile Research InstituteBeijing 100053P.R.China

Based on the analysis of application status in real network,the trace model of some typical mobile Internet applications data is given and their impact on 2G/3G network is discussed in this ***,in order to support the mobile Internet application efficiently in future,the issues including the impact on the Long Term Evolution (LTE-A) system and some potential solutions for performance optimization are *** on the trace data model of IM traffic,the performacne evaluaiton of LTE-A system shows that some specific configuration machanisms can play an important role in improving network system efficiency in the case of IM traffic.

关键词： mobile Internet traffic LTE-A system performance optimization Mobile QQ

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A Penalty-Regularization-Operator Splitting Method for the Numerical Solution of a Scalar Eikonal Equation

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Chinese Annals of Mathematics,Series B 2015年第5期36卷 659-688页

作者： Alexandre CABOUSSAT roland GLOWINSKI Haute Ecole de Gestion de Genève HES-SO//University of Applied Sciences Department of Mathematics University of Houston

In this article, we discuss a numerical method for the computation of the minimal and maximal solutions of a steady scalar Eikonal equation. This method relies on a penalty treatment of the nonlinearity, a biharmonic regularization of the resulting variational problem, and the time discretization by operator-splitting of an initial value problem associated with the Euler-Lagrange equations of the regularized variational problem. A low-order finite element discretization is advocated since it is well-suited to the low regularity of the solutions. Numerical experiments show that the method sketched above can capture efficiently the extremal solutions of various two-dimensional test problems and that it has also the ability of handling easily domains with curved boundaries.

关键词： Eikonal equation Minimal and maximal solutions Regularization methods Penalization of equality constraints Dynamical flow Operator splitting Finite element methods

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Conserved host-pathogen interactions identify novel treatment options in betacoronavirus infections

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Signal Transduction and Targeted Therapy 2021年第3期6卷 557-559页

作者： Soeren Lukassen roland Eils Charity-Universitatsmedizin Berlin corporate member of Freie Umversitat BerlinHumboldt-Universitat zu Berlinand Berlin Institute of HealthBerlinGermany Center for Digital Health Berlin Institute of Health(BIH)BerlinGermany Health Data Science Unit Heidelberg University Hospital and BioQuantHeidelbergGermany

In a recent study published in Science,1 Gordon et *** the host-pathogen interactome of the coronaviruses SARS-CoV-1,SARS-CoV-2,and MERS-CoV,all of which caused lethal outbreaks in the past two *** functionally characterize a number of these interactions,leveraging the information to identify promising candidate molecules for drug-repurposing.

关键词： identif interactions treatment

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On the Numerical Solution to a Nonlinear Wave Equation Associated with the First Painlev Equation:an Operator-Splitting Approach

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Chinese Annals of Mathematics,Series B 2013年第2期34卷 237-254页

作者： roland GLOWINSKI Annalisa QUAINI Department of Mathematics University of Houston4800 Calhoun RdHouston(TX) 77204USA Laboratoire Jacques-Louis Lions Universit Pierre et Marie Curie4Place Jussieu75252 Paris CEDEX 05France

The main goal of this article is to discuss the numerical solution to a nonlinear wave equation associated with the first of the celebrated Painlevd transcendent ordinary differential equations. In order to solve numerically the above equation, whose solutions blow up in finite time, the authors advocate a numerical methodology based on the Strang＇s symmetrized operator-splitting scheme. With this approach, one can decouple nonlinearity and differential operators, leading to the alternate solution at every time step of the equation as follows：（i） The first Painlevd ordinary differential equation, （ii） a linear wave equation with a constant coefficient. Assuming that the space dimension is two, the authors consider a fully discrete variant of the above scheme, where the space-time discretization of the linear wave equation sub-steps is achieved via a Galerkin/finite element space approximation combined with a second order accurate centered time discretization scheme. To handle the nonlinear sub-steps, a second order accurate centered explicit time discretization scheme with adaptively variable time step is used, in order to follow accurately the fast dynamic of the solution before it blows up. The results of numerical experiments are presented for different coefficients and boundary conditions. They show that the above methodology is robust and describes fairly accurately the evolution of a rather ＂violent＂ phenomenon.

关键词： Painlevd equation Nonlinear wave equation Blow-up solution Operator-SDlitting

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Deposition of nano-crystalline tungsten carbide powders from gaseous WO_(2)(OH)_(2)

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Tungsten 2023年第1期5卷 136-144页

作者： Markus Ostermann roland Haubner TU Wien Institute of Chemical Technologies and AnalyticsGetreidemarkt 9/164-031060 ViennaAustria

Lower WC grain sizes in the nanometer range have positive effects on the properties of hardmetals(e.g.,hardness),but the established production processes of WC are limited to grain sizes of about 150 *** produce WC powder with grain sizes in the lower nanometer range,an alternative WC production process based on the chemical vapor transport(CVT) reaction of WO_(3) and H_(2)O forming gaseous WO_(2)(OH)_(2) at about 1100 ℃,followed by a carburation reaction with H_(2)/CH_(4)-gas mixtures was *** influences of different process parameters such as furnace temperature,humidity and gas flows were investigated to improve the *** the right set of parameters the produced powder consisted mainly of agglomerated WC grains with a size of about 5 *** the common hexagonal WC phase,the cubic WC1-xphase was stabilized due to the small crystallite *** addition,a thin layer of amorphous carbon was present on the powder surface due to the catalytic methane decomposition on the WC *** amount of oxidic and metallic residues in the product powder was minimized with the parameter optimization and the powder yield was increased up to about 50%.With further optimization of the process parameters and usage of improved flow breakers,the purity and yield of the product powder can be further *** an application in the hardmetal section is not realistic at the moment,applications in the catalysis sector could be considered due to the small grain size and good catalytic activity of the cubic WC1-xphase.

关键词： Tungsten carbide CVT-mechanism WO2(OH)2 Carburation Nano-sized powder Transmission electron microscopy(TEM)

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