检索结果-南通市图书馆

Determination of the Performance Scores of a Photovoltaic Power Plant Connected to the Grid: The Zagtouli Photovoltaic Power Plant in Burkina-Faso

引用

Advances in Materials Physics and Chemistry 2024年第11期14卷 264-272页

作者： Toussaint Tilado Guingane Eric Korsaga Sosthène Tassembedo Rene Ouedraogo Physics UFR/SEA Materials and Environment Laboratory (LAME) Pr. Joseph Ki ZERBO University Ouagadougou Burkina Faso Physics UFR/ST Science and Technology Laboratory (LaST) Thomas SANKARA University Ouagadougou Burkina Faso

Photovoltaic solar energy is still in its infancy in Burkina Faso, despite the country’s high solar potential. The electricity grid is experiencing an increase in demand for energy, creating a shortfall in supply. The Zagtouli photovoltaic solar power plant in Burkina Faso is the first milestone in the development of renewable photovoltaic energy, with a rated output of 33.6 Megawatts peak, to strengthen the electricity grid by reducing hydrocarbon consumption. The aim of this work is to evaluate the performance of the plant by proposing a performance score for the Zagtouli plant, which should provide a basis for assessing the performance of a power plant. To meet the objectives, we collected data for three consecutive years of production, from 2019 to 2021. From this data, we used the method based on the calculation of the performance indicators specified by the International Energy Agency (IEA) and described in the standardised norms IEC (International Electrotechnical Commission) CEI61724, and we also carried out a performance classification using the K-Means method. It is clear that with the results obtained for the PR performance index (over 70%), the installation can be classified as one of the best-performing systems. It also emerges that various losses (temperatures on the panels, cabling, partial shading, spectral losses, dirt, and unexpected inverter failures) have a negative impact on the installation’s energy production.

关键词： Solar Energy Solar Power Plant Climatic Parameters Performance Classification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Copy Mean: A new Method to Impute Intermittent Missing Values in Longitudinal Studies

引用

Open Journal of Statistics 2013年第4期3卷 26-40页

作者： Christophe Genolini René écochard Hélène Jacqmin-Gadda Hospices Civils de Lyon Service de Biostatistique Lyon France Université Lyon 1 Villeurbanne France CNRS UMR5558 Laboratoire de Biométrie et Biologie Evolutive Villeurbanne France UMR U1027 INSERM Université Paul Sabatier Toulouse France CeRSM (EA 2931) UFR STAPS Université de Paris Ouest Nanterre La Défense Nanterre France Université de Bordeaux ISPED Centre INSERM U897-Epidemiology-Biostatistique Bordeaux France

Longitudinal studies are those in which the same variable is repeatedly measured at different times. These studies are more likely than others to suffer from missing values. Since the presence of missing values may have an important impact on statistical analyses, it is important that they should be dealt with properly. In this paper, we present “Copy Mean”, a new method to impute intermittent missing values. We compared its efficiency in eleven imputation methods dedicated to the treatment of missing values in longitudinal data. All these methods were tested on three markedly different real datasets (stationary, increasing, and sinusoidal pattern) with complete data. For each of them, we generated nine types of incomplete datasets that include 10%, 30%, or 50% of missing data using either a Missing Completely at Random, a Missing at Random, or a Missing Not at Random missingness mechanism. Our results show that Copy Mean has a great effectiveness, exceeding or equaling the performance of other methods in almost all configurations. The effectiveness of linear interpolation is highly data-dependent. The Last Occurrence Carried Forward method is strongly discouraged.

关键词： Imputation Longitudinal Data Intermittent Missing Values

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Adenine phosphoribosyltransferase deficiency: Leave no stone unturned

引用

World Journal of Clinical Urology 2014年第3期3卷 218-226页

作者： Guillaume Bollée Michel Daudon Irène Ceballos-Picot Division of nephrology and Research Center of the Centre Hospitalier de l’Université de Montréal and Université de Montréal Montréal Québec H2L 4M1 Canada Service d’Explorations Fonctionnelles Assistance Publique H?pitaux de ParisH?pital Tenon75020 Paris France Université Paris Descartes Assistance Publique H?pitaux de Paris Laboratoire de Biochimie Métabolomique et protéomiqueH?pital Necker-Enfants Malades75015 Paris France

Adenine phosphoribosyltransferase(APRT)deficiency is a rare autosomal recessive disease leading to generation of large amounts of 2,8-dihydroxyadenine(DHA).DHA is excreted in urine,where it precipitates into crystals due to its low *** crystals can aggregate into stones or cause injury to the renal parenchyma(DHA nephropathy).Recurrent urolithiasis and DHA nephropathy are the two clinical manifestations of APRT *** of APRT deficiency can be made during childhood as well as *** mainly relies on the recognition of DHA in stones or urine *** of APRT activity and genetic testing are useful for confirmation of diagnosis,for family screening and should be considered in difficult cases of urolithiasis or crystalline *** therapy is the cornerstone of treatment and is highly effective in preventing recurrence of stones and kidney *** fluid intake and dietary modifications are also *** diagnosis and treatment are of paramount importance to prevent renal ***,diagnosis of APRT deficiency is often overlooked and irreversible renal failure still occurs in a substantial proportion of *** must be alert to the possibility of APRT deficiency and consider the appropriate diagnostic tests in certain *** review discusses the genetic and biochemical mechanisms of APRT deficiency,and the issues of diagnosis and management.

关键词： Adenine phosphoribosyltransferase Dihydroxyadenine Urolithiasis Crystalline nephropathy 2,8-dihydroxyadenine nephropathy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

引用

Advances in Chemical Engineering and Science 2011年第2期1卷 51-60页

作者： Nadia Hammouda Hacène Chadli Gildas Guillemot Kamel Belmokre 不详

Electrochemical impedance spectroscopy (EIS) in the l00 kHz-10 mHz frequency range was employed as the main electrochemical technique to study the corrosion protection behaviour of zinc rich epoxy paint in 3% NaCl solution. The EIS results obtained at the open-circuit corrosion potential have been interpreted using a model involving the impedance of particle to particle contact to account for the increasing resistance between zinc particles with immersion period, in addition to the impedance due to the zinc surface oxide layer and the electrical resistivity of the binder. Galvanic current and dc potential measurements allowed us to conclude that the cathodic protection effect of the paint takes some time to be achieved. The loss of cathodic protection is due to a double effect: the decrease of the Zn/Fe area ratio due to Zn corrosion and the loss of electric contact between Zn to Zn particles. Even when the cathodic protection effect by Zn dust become weak, the substrate steel is still protected against corrosion due to the barrier nature of the ZRP film reinforced by Zn.

关键词： Zinc-Rich Epoxy Paints Cathodic Protection Electrochemical Impedance Spectroscopy Corrosion Mechanisms

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Two Unusual Cases of Sudden Death in Children

引用

Open Journal of Pathology 2013年第2期3卷 69-72页

作者： Maria-Chiara Osterheld Marie-Hélène Perez Institute of Pathology University of Lausanne Lausanne Switzerland

We report two unusual cases of sudden unexpected death in children. Histopathologic examination showed intimal fibroplasias, a variant of fibromuscular dysplasia of the right coronary artery associated in both cases with fatty infiltration of the right ventricular myocardium. The significance of this particular combination of two lesions known to induce a sudden death in young people is discussed.

关键词： Arrhythmogenic Right Ventricular Dysplasia-Like Cardiomyopathy Fibromuscular Coronary Artery Dysplasia Sudden Death

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Construction Technology of Biodigesters in Senegal

引用

Energy and Power Engineering 2023年第10期15卷 329-339页

作者： Momath Ndiaye Madialène Sene Goumbo Ndiaye Ed Léon Sadio UFR Fundamental Sciences and Engineering University of Sine Saloum El Hadj Ibrahima NIASS Kaolack Senegal SEN’EAU Dakar Senegal Renewable and Cold Energies University of Sine Saloum El Hadj Ibrahima NIASS Kaolack Senegal

Faced with the depletion of fossil energy resources and given the current context of the fight against climate change, Renewable Energies (RE) represent an increasingly growing challenge. Of all these energies, those resulting from the biomethanization of biomass now provide an opportunity in the world of farmers and breeders. The treatment of agro-pastoral residues by anaerobic digestion has been the subject of renewed interest in recent years, thanks in particular to the production of energy from biomass, not to mention the production of fertilizers from effluents. Expelled from the digesters. This method of transformation offers many environmental, socio-economic and agricultural interests. Indeed, the biogas obtained from organic matter allows, among other things, to cook, light houses, and produce electricity and heat. The objective of this study is to compare the construction techniques and costs of the biodigester models that exist in Senegal. There are many biodigesters, the choice of an installation depends on the available space and the nature of the soil. Several types of biodigester technologies are installed in Senegal. The GGC 2047 fixed dome, the RMB geomembrane and the BEG geomembrane. First we will describe the construction techniques of the modified GGC model fixed dome biodigester, then of the RMB model geomembrane and finally of the BEG model geomembrane.

关键词： Biodigester Biomass Fixed Dome Geomembrane Renewables Energies

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

COVID-19 Vaccine Rejection among Muslims in Turkey: Religiosity and Fear of Death

引用

Journal of Biosciences and Medicines 2023年第6期11卷 71-80页

作者： neşe Karakaş Mert Kartal Gürkan Kapikiran Recep Bentli Department of Public Health Faculty of Medicine Malatya Turgut &Oumlzal University Malatya Turkey Department of Emergency Aid and Disaster Management Faculty of Health Sciences Malatya Turgut &Oumlzal University Malatya Turkey Department of Internal Medicine Faculty of Medicine Inonu University Malatya Turkey

This study aimed to examine the relationship between COVID-19 vaccine refusal and religiosity and fear of death among Muslims living in Turkey. This cross-sectional study was conducted online with 1046 adults aged 18 and older. The Ok-Religious Attitude Scale (Islam) (ORASI) (8 items) and Thorson-Powell Death Anxiety Scale (TPDAS) (20 items) were used as data collection instruments. The data were analyzed using the Pearson chi-square test, Student’s t-test, and binary logistic regression. A p-value of 0.05). In binary logistic regression analysis, vaccine rejection was 7.19 times higher among single people, 50.55 times higher among workers and tradesmen, and 3.36 times higher among people who did not have COVID-19. As religiosity increased, the risk of vaccine refusal decreased 1.037-fold.

关键词： COVID-19 Vaccines Vaccine Hesitancy Religiosity Fear of Death Muslim

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research of inverse mathematical model to high-speed trains

引用

Journal of Central South University 2014年第1期21卷 428-438页

作者：朱涛肖守讷马卫华阳光武 Traction Power National Key Laboratory Southwest Jiaotong University

Operation safety and stability of the train mainly depend on the interaction between the wheel and *** of wheel/rail contact force is important for vehicle control systems that aim to enhance vehicle stability and passenger *** wheel/rail contact forces of high-speed train are very difficult to measure directly,a new estimation process for wheel/rail contact forces was introduced in this *** on the state space equation,dynamic programming methods and the Bellman principle of optimality,the main theoretical derivation of the inversion mathematical model was *** new method overcomes the weakness of large fluctuations which exist in current inverse ***-speed vehicle was chosen as the research object,accelerations of axle box as input conditions,10 degrees of freedom vertical vibration model and 17 degrees of freedom lateral vibration model were established,*** 250 km/h,the vertical and lateral wheel/rail forces were *** the time domain and frequency domain,the comparison of the results between inverse and SIMPACK models were *** results show that the inverse mathematical model has high precision for inversing the wheel/rail contact forces of an operation high-speed vehicle.

关键词： load inversion high-speed vehicle wheel/rail contact force derailment index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

2,4,6-trinitrobenzene sulfonic acid-induced chronic colitis with fibrosis and modulation of TGF-β1 signaling

引用

World Journal of Gastroenterology 2014年第48期20卷 18207-18215页

作者： Emilien Loeuillard Julien Bertrand Anni Herranen Chloé Melchior Charlène Guérin Mo?se Co?ffier Moutaz Aziz Pierre Déchelotte Guillaume Savoye Rachel Marion-Letellier INSERM UnitUMR1073 Rouen University and Rouen University HospitalRouen Cedex 76183 France Institute for Research and Innovation in Biomedicine University of Rouen Rouen Cedex 76183 France Department of Gastroenterology Rouen University Hospital Rouen Cedex 76183 France Nutrition Unit Rouen University Hospital Rouen Cedex 76183 France Department of Pathology Rouen UniversityHospital Rouen Cedex 76183 France

AIM:To investigate whether targeting proteasome might reverse intestinal fibrosis in ***:Chronic colitis was induced in rats by repeated administration of increasing dose of2,4,6-trinitrobenzene sulfonic acid(TNBS,15,30,45,60,60,60 mg)by rectal injection for 6 wk(from day0 to day 35),while control rats received the ***+bortezomib(BTZ)rats received intraperitoneal injections of BTZ twice weekly(from day 37 to day44)at a dose of 25 mg/kg,whereas the control and TNBS groups received the same amount of the *** scoring of inflammation and fibrosis was *** production of transforming growth factor(TGF)-βwas measured by *** fibrosisrelated proteins such as phospho-p38,phosphoSMAD2/3,Akt and peroxisome proliferator activated receptorγ(PPARγ)were studied by western *** of the tight junction proteins,occludin and claudin-1,were assessed by Western *** proteasome activities(chymotrypsin-like and trypsinlike activities)were ***:TNBS-treated rats had a higher colon weight/length ratio compared to control rats(P0.05).In contrast,bortezomib had no effect on other studied parameters such as fibrosis score,TGF-βsignaling,or tight junction expression(P>0.05 for all).CONCLU

关键词： Bortezomib Colitis Fibrosis Proteasome

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Revisiting Akaike’s Final Prediction Error and the Generalized Cross Validation Criteria in Regression from the Same Perspective: From Least Squares to Ridge Regression and Smoothing Splines

引用

Open Journal of Statistics 2023年第5期13卷 694-716页

作者： Jean Raphael Ndzinga Mvondo Eugène-Patrice Ndong Nguéma Department of Mathematics Ecole Polytechnique Yaoundé I Cameroon

In regression, despite being both aimed at estimating the Mean Squared Prediction Error (MSPE), Akaike’s Final Prediction Error (FPE) and the Generalized Cross Validation (GCV) selection criteria are usually derived from two quite different perspectives. Here, settling on the most commonly accepted definition of the MSPE as the expectation of the squared prediction error loss, we provide theoretical expressions for it, valid for any linear model (LM) fitter, be it under random or non random designs. Specializing these MSPE expressions for each of them, we are able to derive closed formulas of the MSPE for some of the most popular LM fitters: Ordinary Least Squares (OLS), with or without a full column rank design matrix;Ordinary and Generalized Ridge regression, the latter embedding smoothing splines fitting. For each of these LM fitters, we then deduce a computable estimate of the MSPE which turns out to coincide with Akaike’s FPE. Using a slight variation, we similarly get a class of MSPE estimates coinciding with the classical GCV formula for those same LM fitters.

关键词： Linear Model Mean Squared Prediction Error Final Prediction Error Generalized Cross Validation Least Squares Ridge Regression

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：