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Study of Optimal Frequency to the Repairable System Due to Failure Finding Interval to Maximize Availability System

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Journal of Applied Mathematics and Physics 2023年第6期11卷 1795-1805页

作者： Emmanuel Hagenimana Charline Uwilingiyimana Umuraza clarisse Department of Civil Engineering Institut d’Enseignement Supérieur de Ruhengeri Musanze Rwanda Department of Statistics Applied to Economy Institut d’Enseignement Supérieur de Ruhengeri Musanze Rwanda School of Economics Shandong University Qingdao China

This research article is based on a study of optimal frequency to the repairable system due to the failure finding interval to maximize as well as minimize the availability of some components devices. We studied together maintenance and corrective actions that carried out item of failure and periodic failure finding designed to check whether a system is still working. The model is proved as well as useful application in detecting the problem related to finding failure tasks of different scheme devices by maximization. The model formulated and the numerical application to the relevant mathematical model have been discussed to demonstrate the article quality. Therefore based on probability analytic development, the optimal maintenance policy is then obtained as solution of an optimization problem in which the maintenance cost rate is the objective function and the risk of corrective maintenance is the constraint function. Finally, the solution to the optimal device in the considered development model has been well adjusted due to derivation to the experimental observation rather than theory which will be taken into consideration in the next applied practical design research related and the system device provided that, the proactive device agreed with using the exponential distribution to the survive distribution function which can not be considered as valid.

关键词： Maximization Failure Interval Repairable System Inspection Interval Availability System Optimal Inspection

The Impact of Credit Risk Management on Economy of East African Region——A Case Study of Commercial Banks in East African Community

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The Impact of Credit Risk Management on Economy of East Afri...

作者： UMURAZA clarisse 山东大学

学位级别：硕士

本研究旨在分析信用风险管理对经济增长的影响,其中包括五个目标:检验贷款绩效的决定因素,分析确定经济增长的因素,检验贷款绩效评估的关联性。通过反映东非社区成员国国内生产总值的变化对经济增长的影响,研究有助于处理与贷款处理有... 详细信息

本研究旨在分析信用风险管理对经济增长的影响,其中包括五个目标:检验贷款绩效的决定因素,分析确定经济增长的因素,检验贷款绩效评估的关联性。通过反映东非社区成员国国内生产总值的变化对经济增长的影响,研究有助于处理与贷款处理有关的新兴风险的其他信用风险管理方法与其对经济增长的影响之间的关系,建立信贷风险管理方法对银行和借款人来说更方便,以维持适当的经济增长。本研究使用定量和定性分析来实现目的,而回归分析则使用不良贷款比率作为信用风险的指标,并作为实证分析和经济增长率比率的独立变量,这是一个经济增长指标。因变量。主要数据来自五个东非银行贷款部门工作人员案例研究的横断面调查设计,即:DFCU Ltd,Equity Bank,KCB,COGEBANK,FINABANK 和 ECOBANK 在分析原始数据时,描述性和相关性分析用于研究风险转移,风险保留,风险分散,信用评级,技术可行性,财务可行性,利率平衡,贷款评估和贷款绩效,网络攻击保护,持续风险之间的联系。识别和持续的创新操作。二级数据来自中央银行的年度财务可行性报告和国家统计局国家成员国统计局的年度监督报告,数据来自九年期间。调查结果显示,信用风险与经济增长之间存在极显着的相关关系,因为回归分析显示变量之间存在线性关系,而负值则意味着当不良贷款减少时经济增长会增加。信贷风险管理组成部分与贷款业绩呈正相关关系,贷款评估似乎与贷款业绩强烈且显着相关,由于有效贷款业绩,其对经济增长率的影响相同,考虑到其他风险管理方法,贷款业绩是最有效的如风险分散和风险转移。评估程序评估,发现和分析导致业务风险的损失敞口,这增加了借款人偿还贷款而没有任何失败,因为贷款被授予信贷借款人,而后者又希望获得更多信任,再次获得信贷对于未来的项目,贷款多样化也显示出与经济增长的强烈正相关,因为生产活动增加,这有助于提高可持续生活水平和增加支出。在多元化市场,军团或不同经济体中投资贷款组合可降低风险敞口率,为那些渴望创业但缺乏资金的人提供获取资源的途径,从而促进就业创造并带来更好的经济回报。

关键词：信用风险经济增长 GDP 通货膨胀不良贷款

入侵地铁里的动物园 clarisse和Thomas的超现实动物摄影

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摄影之友 2014年第12期 60-66页

作者： clarisse Rebotier Thomas Subtil 三木

动物入侵人类空间将会发生什么?像科幻片中那样,剑拔弩张,战争一触即发?clarisse Rebotier和Thomas Subtil为我们展示了另一种更真实的"入侵",巴黎地铁站中此刻正在上演这一幕。在这个世界上,好似所有的东西都被贴上了标签,而贴上标签... 详细信息

动物入侵人类空间将会发生什么?像科幻片中那样,剑拔弩张,战争一触即发?clarisse Rebotier和Thomas Subtil为我们展示了另一种更真实的"入侵",巴黎地铁站中此刻正在上演这一幕。在这个世界上,好似所有的东西都被贴上了标签,而贴上标签的东西也就对应了相称的存在空间。汤应该盛在碗里。

关键词：动物摄影超现实 clarisse Thomas 科幻片存在空间这个世界怜悯之心杂技表演令

Effect of Sample Matrix on Radial and Axial Profiles of Ion Abundance in Inductively Coupled Plasma Mass Spectrometry

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American Journal of Analytical Chemistry 2011年第7期2卷 739-751页

作者： clarisse Mariet Francine Carrot Mélanie Moskura 不详

In inductively coupled plasma mass spectrometry (ICP-MS) analysis, only a few options are available to deal with non-spectroscopic interferences. Considering that diluting the sample is impractical for traces analysis, other alternatives must be employed. Traditionally, the method of standard additions is used to correct the matrix effect but it is a time consuming method. Others methods involves separation techniques. Another way to overcome matrix interferences is to understand the mechanism involved and adjust plasma viewing conditions to reduce or eliminate the effect. In this study, the effect of various concomitant elements in ICP-MS was assessed by measuring the distribution of selected singly charged analyte ions (Al, V, Cr, Mn, Ni, Co, Cu, Zn, As, In, Ba, La, Ce, Pb), doubly charged ions (La, Ce, Ba and Pb) and oxides ions (BaO) in the presence of concomitant elements spanning a mass range from 23 (Na) to 133 (Cs) u.m.a. and different ionization energies. Concomitant elements are alkali metals, alkaline earth metals and Si. Analyte ion suppression was observed while moving the ICP across and away from the sampling interface with or without a single concomitant element. Matrix effect measures were realised, firstly, to highlight the relation between the signal extinction of an analyte and the masse of the concomitant element, and secondly to highlight the relation between the removal of the analyte signal and the first ionization energy of the element of matrix. A dependence upon both the mass of the matrix element and the mass of the analyte was observed. The suppression seems increased with increasing matrix element mass and decreased with increasing analyte mass. The effect of the mass of the matrix element was the more significant of the two factors. If space-charge effects were found to be significant for matrix elements of much lower mass, it seems diffusion also played an active part for heavier matrix elements. Finally, some evidence was found for a

关键词： Matrix Effects Easily Ionized Elements Inductively Coupled Plasma Mass Spectrometry Spatial Profiling

Mass Transfer around a Rising CO2 Bubble in an Air Lift Column Applied to Aquaculture

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Natural Resources 2020年第5期11卷 205-217页

作者： Djimako Bongo Edith Kadjagaba Nekoulnang Djetounako clarisse Jean-Yves Champagne National Institute of Science and Technology of Abéché Abéché Chad Faculty of Exact and Applied Sciences University of N’Djamena N’Djamena Chad Laboratory of Fluid Mechanics and Acoustics INSA-Lyon Lyon France

He mentioned in the 18th century the possibility of injecting gas bubbles into a column of liquid to create a displacement of this liquid due to the rise of bubbles. This system takes the name of Air Lift and the first publications around this process appear at the beginning of the 20th century. There are many economic and ecological interests: CO2 from industrial production is valued because it is consumed by algae, which once they reach maturity can be converted into fuel. It is therefore a very good energy balance thanks to a low consumption of gray energy and the system is simple to set up. In this study, we will delve deeper into the description of the bubble column and the theory that accompanies it. We will then describe our experiences and the work done.

关键词： Mass Transfer PLIF PIV Transverse Velocity CO2

Influence of Fresh Water on Microbubble Generation in an Airlift Column Applied to Aquaculture: Extraction Capacity

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Open Journal of Applied Sciences 2022年第11期12卷 1809-1823页

作者： Djimako Bongo Nekoulnang Djetounako clarisse Edith Kadjangaba Salif Gaye Jean-Yves Champagne Higher Normal School of Technology of Sarh Sarh Chad Paleontology Department National Research Center for Development of N’djamena N’djamena Chad Faculty of Sciences and Techniques University of Doba Doba Chad LME Materials and Energetics Laboratory University Institute of Technology Thiès Senegal Laboratory of Fluid Mechanics and Acoustics INSA-Lyon Lyon France

Bubble flows consist a liquid phase and a gaseous phase dispersed as bubbles. They occur in nature and in many industrial applications, such as oil transportation in pipelines and steam generators for power generation. Due to large difference in density between gas and liquid, the flottability force causes bubbles to rise, which in turn can generate overall motion and agitation in liquid. This use of gravity as a flow driver, which is specific to disperse phase systems, is used in process engineering (bubble columns and gasosiphon) to sparingly promote mixing and exchange between gas and liquid. In many applications, bubbles are used to agitate a liquid in order to promote mixing and transfers. This work is devoted to study of hydrodynamics of a bubble column. Experimentally, we have determined properties fluctuations of velocities inside the aquarium of rising homogeneous bubbles for different bubble sizes and vacuum rates. The interfacial area between gas and liquid phase is a crucial factor for mass transfer in bubble columns. The molecular exchange between a given volume of gas and water can be enhanced by formation of smaller bubbles, leading to a larger gas-liquid interface. This work presents the various physical phenomena that apply to bubbles, as well as associated dimensionless numbers. A state art of Micro-Bubble Generators (MBG) is then presented, presenting systems using various phenomena such as cavitation, electrolysis, or shear.

关键词： Vacuum Airlift Column MIBC Casein Turbidity Surfactant Coalescence

Income Diversification through a Crop-Livestock-Forest Integration System in the Midwest Brazilian Region

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Journal of Agricultural Science and Technology(B) 2017年第6期7卷 374-385页

作者： clarisse Maia Lana Nicoli Abilio Rodrigues Pacheco Cristiane Aparecida Fioravante Reis FabioVenturoli Embrapa Produtos e Mercado Rodovia BR-153 Km 4 Caixa Postal 714 Goidnia 74001-970 Goias Brazil Embrapa Florestas Estrada da Ribeira Km 111 Caixa Postal 319 Colombo 83411-000 Parana Brazil Universidade Federal de Goids Avenida Esperanga s/n Campus Samambaia Goidnia 74690-900 Goias Brazil

Sustainability on farms is a challenge to competitiveness in the globalized market. In this scenario, due to the strong environmental, economic and social appeal, crop-livestock-forest integration systems have been considered as the future of agriculture. Regarding the economic approach, this system is based on the diversification of income generating activities, with revenue entry at different times, rationalization of resource use and reduction of risk of financial losses. Thus, the purpose of this work was to carry out the economic analysis of a crop-livestock-forest integration system, located at Boa Vereda＇s farm, in the municipality of Cachoeira Dourada in the state of Goi^is in the central-west region of Brazil. The system was composed of the following traditional crops of the region： soybean, corn, pasture, beef cattle and eucalyptus. The technical coefficients and the prices used for economic evaluation were obtained from the experimental unit and from the local market when crops were harvested in 2016/2017. The economic indicators used to assess economic viability were the net present value （NPV） and the equivalent annual uniform value （EAUV）. The results showed a return greater than the opportunity cost of the land, showing the attractiveness of the crop-livestock-forest integration system. Thus, this system represents an economically viable alternative that, among other benefits, allows the diversification of its sources of income, with a reduction of risk.

关键词： Agroforestry system economic analysis soybean corn beef cattle eucalyptus.

Effects of nanotopography on stem cell phenotypes

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World Journal of Stem Cells 2009年第1期1卷 55-66页

作者： Rajeswari Ravichandran clarisse CH Ng Casey K Chan Michael Raghunath Seeram Ramakrishna Division of Bioengineering Faculty of EngineeringNational University of SingaporeSingapore 117574Singapore Department of Mechanical Engineering Faculty of Engineering National University of SingaporeSingapore 117576Singapore Nanoscience and Nanotechnology Initiative National University of Singapore2 Engineering Drive 3Singapore 117576Singapore Department of Restorative Dentistry Faculty of DentistryNational University of SingaporeSingapore 119074 Singapore Department of Orthopaedic Surgery Yong Loo Lin School of MedicineNational University of Singapore Singapore 119074Singapore Department of Biochemistry Yong Loo Lin School of Medicine8 Medical DriveNational University of SingaporeSingapore 117597Singapore

Stem cells are unspecialized cells that can self renew indefinitely and differentiate into several somatic cells given the correct environmental *** the stem cell niche,stem cell-extracellular matrix(ECM)interactions are crucial for different cellular functions,such as adhesion,proliferation,and ***, in addition to chemical surface modifications,the importance of nanometric scale surface topography and roughness of biomaterials has increasingly becoming recognized as a crucial factor for cell survival and host tissue acceptance in synthetic *** review describes the influence of nanotopography on stem cell phenotypes.

关键词： Stem cells Nanofibers Nanotopography Biomaterials Extracellular matrix Differentiation

Results of the Management of Gastrointestinal Stromal Tumors (GIST): About 6 Cases at the Vichy Hospital Center (France)

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Journal of Cancer Therapy 2022年第7期13卷 397-404页

作者： Omar Sow Nicolas Sorbane Fetche Vermare clarisse Annabel Bautrand Alice Anusca Lionel Perrot Department of Visceral and Digestive Surgery Vichy Hospital Center Vichy France Department of Surgery H&ocirc pital de la Paix Assane Seck University Ziguinchor Senegal

The aim of our study was to analyze the results of surgical management of gastrointestinal stromal tumors (GIST) at the Vichy Hospital Center. Methodology: Between 2010 and 2020, the data of 6 patients operated at the Vichy Hospital Center for GIST were analyzed. The parameters studied were: age, sex, antecedents, discovery circumstances, imagery, surgical procedure, anatomopathological data, the follow-up and the morbidity-mortality. Results: There were 5 men and one woman with an average age of 72.16 years [58 - 80 years]. The average time of evolution was 8 months (0 - 14 months). The diagnosis was fortuitous in 2 cases. Atypical abdominal pain was the main symptom in 3 cases. One case was received in a clinical picture of peritoneal irritation syndrome. Echo-endoscopy with biopsy specimen histology made it possible to make the diagnosis in 5 cases and the surgical specimen in 1 case. The fusiform type was the predominant histological form. The stomach was the most common location. The average size of GISTs was 7.3 × 4 cm with a positive C Kit in all patients. Neoadjuvant chemotherapy was performed on one patient. Surgery was curative and was done laparoscopically on 4 patients. Adjuvant chemotherapy based on Imatinib at a rate of 400 mg/d in 3 patients was initiated. One patient presented a fistula of the esophagus-jejunal anastomosis on D6 post operation controlled by a drainage and an antibiotic therapy. Mortality was zero. During the surgery, all of the patients were followed up with surgeon, oncologist. Conclusion: GISTs are the most common mesenchymal tumors of the digestive tract with a preferential gastric location. Laparoscopic surgery, with advances in molecular biology and the introduction of targeted therapy has improved the management of these tumors in terms of morbidity and mortality.

关键词： Gastrointestinal Stromal Tumor Laparoscopic Surgery Targeted Therapy