检索结果-南通市图书馆

Performance Evaluation of Solar Chimney Draft: Application to Ventilation

Smart Grid and Renewable Energy 2024年第4期15卷 107-122页

作者： Boukaré Ouedraogo Adama Ouedraogo arouna kabore Kalifa Palm Dieudonné Joseph Bahiebo Laboratoire dEnergies Thermiques Renouvelables (LETRE) Universit Joseph KI-ZERBO: UFR/SEA Ouagadougou Burkina Faso Laboratoire de Chimie Analytique Physique Spatiale et Energtique (LACAPSE) Universit Norbert ZONGO Koudougou Burkina Faso Centre Universitaire Polytechnique de Kaya (CUP-Kaya) Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire des Systmes dEnergie Renouvelable et Environnement Institut de Recherche en Sciences Appliques et Technologies (IRSAT) Centre National de la Recherche Scientifique et Technologique (CNRST) Ouagadougou Burkina Faso

Ventilation is one of the factors contributing to energy consumption in buildings and food preservation. The solar chimney proves to be an alternative for reducing conventional energy consumption. Thus, in this study, the performance of a solar chimney with two active faces for thermally drawing air from a chamber for preserving agri-food products was evaluated. These performances were experimentally assessed through data measurements: temperatures and velocities within the chimney, and their analysis using Excel and MATLAB. The obtained results were compared with those from literature to verify their validity. From this study, it is found that the maximum temperature at the chimney outlet reaches 49.4˚C with an average value of 43.7˚C. Additionally, the heating evolution of the chimney air presents four (04) identical phases in pairs, reflecting the chimney’s operation throughout day. The temperature difference between the outlet and inlet of the chimney reaches a maximum of 17˚C with an average of 12.6˚C. Regarding airflow, the maximum air velocity at the chimney outlet is 0.8 m/s, and the average velocities have consistently been greater than or equal to 0.46 m/s. Thus, it can be concluded that the solar chimney is capable of providing ventilation for the preservation chamber through thermal draft.

关键词： Solar Chimney Natural Ventilation Thermal Draft Airflow Chimney Effect

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

Performance Evaluation of Solar Chimney Draft: Application to Ventilation

引用

Smart Grid and Renewable Energy（智能电网与可再生能源） 2024年第4期 107页

作者： Boukaré Ouedraogo Adama Ouedraogo arouna kabore Kalifa Palm Dieudonné Joseph Bahiebo

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Sentiment Analysis of Code-Mixed Bambara-French Social Media Text Using Deep Learning Techniques

引用

Wuhan University Journal of Natural Sciences 2018年第3期23卷 237-243页

作者： arouna KONATE DU Ruiying State Key Laboratory of Software Engineering/School of Computer Wuhan University Wuhan 430072 Hubei China Collaborative Innovation Center of Geospatial Technology Wuhan 430079 Hubei China

The global growth of the Internet and the rapid expansion of social networks such as Facebook make multilingual sentiment analysis of social media content very necessary. This paper performs the first sentiment analysis on code-mixed Bambara-French Facebook comments. We develop four Long Short-term Memory（LSTM）-based models and two Convolutional Neural Network（CNN）-based models, and use these six models, Na？ve Bayes, and Support Vector Machines（SVM） to conduct experiments on a constituted dataset. Social media text written in Bambara is scarce. To mitigate this weakness, this paper uses dictionaries of character and word indexes to produce character and word embedding in place of pre-trained word vectors. We investigate the effect of comment length on the models and perform a comparison among them. The best performing model is a one-layer CNN deep learning model with an accuracy of 83.23 %.

关键词： sentiment analysis code-mixed Bambara-French Facebook comments deep learning Long Short-Term Memory(LSTM) Convolutional Neural Network(CNN)

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

Deep Desulfurization of Model Fuel by Vanadium-containing Polyoxometalate/H2O2/Ionic Liquid System

Deep Desulfurization of Model Fuel by Vanadium-containing Po...

引用

作者： arouna Dolo 东北师范大学

学位级别：硕士

从化石燃料中脱硫仍然存在许多环境问题、工业问题、甚至是经济问题。在很多情况下,硫化合物、脱硫成本高、催化性能不稳定和燃烧效率低都是非环境良性影响。因此,基于有效地脱硫方法的发展,人们坚持不懈的努力解决这些障碍以替代加氢脱...

从化石燃料中脱硫仍然存在许多环境问题、工业问题、甚至是经济问题。在很多情况下,硫化合物、脱硫成本高、催化性能不稳定和燃烧效率低都是非环境良性影响。因此,基于有效地脱硫方法的发展,人们坚持不懈的努力解决这些障碍以替代加氢脱硫,加氢脱硫技术效率低并且所需环境恶劣。催化氧化脱硫可以在温和的条件下进行,是一种非常具有前景的脱硫过程,但是催化剂的溶解性、溶剂的重复利用是获得超低硫柴油不可避免会面临的阻碍。利用离子液体代替复杂的有机溶剂不仅能够很容易的重复使用,而且还能提高催化效率。因此,我们采用离子液体和Keggin型含钒多金属氧酸盐进行催化氧化脱硫。结果清楚地表明,催化剂的催化氧化脱硫效率达到99.14%,并且循环使用5次整个催化体系的催化效果仍然很好。因此,催化氧化脱硫的简易性和高活性使得它能够代替加氢脱硫广泛地适用于工业脱硫。

关键词：

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Secure Pairing with Wearable Devices by Using Ambient Sound and Light

引用

Wuhan University Journal of Natural Sciences 2017年第4期22卷 329-336页

作者： LIU Dong CHEN Jing DENG Qisi arouna KONATE TIAN Zairong State Key Laboratory of Software Engineering / School ofComputer Wuhan University Wuhan 430072 Hubei China Beijing Guangyude Vision Tech Co. Ltd Beijing 100118China

Wearable devices usually work together with smart *** ensure only legitimate smart phones can read the data,they must conduct pairing to establish a shared *** pairing methods require that the pairing devices have a keyboard or screen for user ***,due to the size limitation,keyboards or screens are hard to be installed in the wearable *** solve this problem,we propose a novel pairing method by using ambient sound and *** this new scheme,any pairing request from smart phone will trigger wearable device *** after users press the confirm key on the device can the pairing process *** pairing devices collect ambient sound and light at the predetermined time and establish a shared key by using the Diffie-Hellman *** protect against potential man-in-the-middle attacks in the key establishment process,an improved interlock protocol with sound and light comparison is conducted to authenticate the *** both the sound and light collected by the pairing devices are similar enough,the key is ***,it is *** with current context based pairing methods,our scheme does not impose strict synchronization on devices to collect ambient context ***,our scheme need not collect and exchange contextual information for multiple times to resist offline brute force *** experimental results and security analysis prove the effectiveness of our scheme.

关键词： device pairing context comparison wearable devices

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

L1 Existence and Uniqueness of Entropy Solutions to Nonlinear Multivalued Elliptic Equations with Homogeneous Neumann Boundary Condition and Variable Exponent

引用

Journal of Partial Differential Equations 2014年第1期27卷 1-27页

作者： OUARO Stanislas OUEDRAOGO arouna Universite de Ouagadougou Unite de Formation et de Recherche en Sciences Exactes et Appliquees Departement de Mathematiques B.P.7021 Ouagadougou 03 Burkina Faso.

In this work, we study the following nonlinear homogeneous Neumann boundary value problemβ （u） -diva （x, 7u） f in fΩ, a （x, u）. η= 0 on Ω, where Ω is a smooth bounded open domain in RN, N ≥ 3 with smooth boundary Ωand ηthe outer unit normal vector on Ω . We prove the existence and uniqueness of an entropy solution for L1-data f. The functional setting involves Lebesgue and Sobolev spaces with variable exponent.

关键词： Elliptic equation variable exponent entropy solution L1-data Neumann boundarycondition.

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

Field Efficacy of a Biopesticide Based on Tithonia diversifoliaagainst Black Sigatoka Disease of Plantain (Musaspp., AAB)

引用

Agricultural Sciences 2020年第8期11卷 730-743页

作者： Cécile Annie Ewané Robinson Nembot Tatsegouock arouna Meshuneke Nicolas Niemenak Laboratory of Phytoprotection and Plant Valorization Biotechnology Center University of Yaoundé 1 Yaoundé Cameroon Laboratory of Plant Physiology Higher Teacher’s Training College Yaoundé Cameroon Department of Biochemistry Faculty of Science University of Yaoundé 1 Yaoundé Cameroon Department of Biological Science Higher Teacher’s Training College Yaoundé Cameroon

Black Sigatoka disease (BSD) is a foliar disease caused by Mycosphaerella fijiensis, responsible of reduction of the photosynthetic area of banana plant and yield at harvest since it has an influence on fruit physiology. The control of BSD relies on the use of chemicals which are not affordable for the small holder farmers and increase the cost of production. Moreover, this chemical control is ineffective, negatively impacting the environment and human health, and is at the origin of strain resistance. Tithonia diversifolia is known as rich in many compounds such as mineral elements, defense metabolites, some phytochemicals;and it is increasingly used in agriculture. Recently, the protective effect of Tithonia diversifolia liquid extract against BSD development on plantain vivoplants in the nursery was highlighted. The aim of our study was to evaluate the efficacy of a biopesticide base on Tithonia diversifolia on the BSD development in a plantain field under high disease pressure. The effect of Tithonia diversifolia biopesticide on Mycosphaerella fijiensis mycelial growth in vitro was evaluated. An experimental field at the flowering stage was selected and treated with the biopesticide base on Tithonia diversifolia at three different concentrations: undiluted (100%), diluted at 1/2 (50%) and diluted at 1/4 (25%) for 17 weeks. The disease severity, the number of functional leaves, the youngest spotted leaf (YSL) and the youngest necrotic leaf (YNL) were evaluated in course of time. The biopesticide treatments significantly (P Tithonia diversifolia could be a hopeful ecoresponsible solution for the

关键词： Plantain (Musa spp.) Black Sigatoka Disease (BSD) Mycosphaerella fijiensis Tithonia diversifolia Biopesticide Efficacy

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

Plantain Bananas PIF Seedlings Treatment with Liquid Extracts of Tithonia diversifoliaInduces Resistance to Black Sigatoka Disease

引用

American Journal of Plant Sciences 2020年第5期11卷 653-671页

作者： Robinson Nembot Tatsegouock Cécile Annie Ewané arouna Meshuneke Thaddée Boudjeko Laboratory of Phytoprotection and Plant Valorization Biotechnology Center University of Yaoundé 1 Messa-Yaoundé Cameroon Department of Biochemistry Faculty of Science University of Yaoundé 1 Yaoundé Cameroon.

Plantain bananas culture encounters the problems of seedlings quantity and quality unavailability. Black Sigatoka Disease (BSD) is one of the main pathological constraints of banana that can severely reduce the photosynthetic leaf area, leading to the losses of production of about 50% in banana plantation. The use of liquid extracts of Tithonia diversifolia could potentially induced the resistance of the PIF seedlings to BSD during the vegetative stages in the nursery. The aim of this work was to evaluate the effect of Tithonia diversifolia liquid extracts against the development of BSD on the PIF plantain bananas seedlings. The explants in the greenhouse and the seedlings in the shade were watered with liquid extracts of T. diversifolia during the process of PIF seedling production in sterile and non-sterile conditions. The treated seedlings show a more effective enhancement of seedlings quality parameters and also induce resistance against BSD. The vegetative stages parameters (the number of shoots, the diameter and the height of shoots, the foliar area, the length and weight roots) were improved in treated seedlings compared to controls ones. The treated seedlings showed maximum protection against BSD of up to 87% compared to controls. They also exhibited an increase in the accumulation of total proteins and total phenolics, as well as the activity of defense-related enzymes (peroxidase, polyphenol oxidase and glucanase). The treatment seems to acts as a vital stimulator and could therefore be a useful tool for small holder farmers favouring an eco-friendly agriculture using fewer synthetic inputs.

关键词： Plantain Banana PIF Seedlings Tithonia diversifolia Black Sigatoka Disease Induced Resistance Vital Stimulator

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

Total Electron Content Diurnal and Seasonal Variations and Response to Solar Events at Koudougou Station in Burkina Faso

引用

International Journal of Geosciences 2023年第9期14卷 827-839页

作者： Yacouba Sawadogo M’Bi Kaboré Somaïla Koala arouna Mandé Jean Louis Zerbo Laboratoire de Matériaux d’Héliophysique et Environnement (La.M.H.E) Université Nazi BONI Bobo-Dioulasso Burkina Faso

In this paper, we studied the seasonal behavior of the total electron content (TEC) during a part of solar cycle 24 ascending, maximum and decreasing phases at Koudougou station (Latitude: 12°15'09"N Longitude: 2°21'45"W). Response of TEC to solar recurrent events is presented. The highest values of the TEC in 2014, 2015 and 2016 were recorded on March and October, while in 2013 they were recorded on April and November, corresponding to equinox months. This observation shows that TEC values at the equinoxes are higher than those of solstices. Moreover, the monthly TEC varies in phase with the sunspots number showing a linear dependence of the TEC on solar activity. The ionospheric electron contents are generally very low both before noon and during the night, but quite high at noon and after noon. This pattern of TEC variation is due to the fluctuation of incident solar radiation on the Earth’s equatorial ionosphere. During quiet periods, the number of free electrons generated is lower than that generated during recurrent periods, which shows a positive contribution of recurrent activity to the level of the TEC. Investigations have also highlighted a winter anomaly and equinoctial asymmetry in TEC behavior at Koudougou station.

关键词： Total Electron Content (TEC) Recurrent Activity Quiet Activity Seasonal Variation

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

Experimental Study of the Thermal Behavior of a Bioclimatic Building Prototype in a Sahelian Zone

引用

Smart Grid and Renewable Energy 2024年第8期15卷 187-199页

作者： arouna Kaboré Boukaré Ouédraogo Sayouba Sandwidi Vincent Zoma Hermann Kaboré Kalifa Palm Laboratoire des Energies Thermiques et Renouvelables (LETRE) Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire de Chimie Analytique Physique Spatiale et Energtique (LACAPSE) Universit Norbert ZONGO Koudougou Burkina Faso Laboratoire de Physique et Chimie de lEnvironnement Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire des Systmes dEnergie Renouvelable et Environnement Institut de Recherche en Sciences Appliques et Technologies (IRSAT) Centre National de la Recherche Scientifique et Technologique (CNRST) Ouagadougou Burkina Faso

Buildings constructed with modern materials (cement blocks, sheet metal, reinforced concrete, etc.) in the Sahelian zone often generate excessive electricity consumption and consequently very high electricity bills. This study is a contribution to the development of new building types based on the principle of bioclimatic construction. The aim is to find materials suited to the Sahelian climate and improve thermal comfort. To this end, an experimental study of the hygrothermal behavior of a bioclimatic building prototype with a domed roof is being carried out. Site meteorological data, air temperature and relative humidity of the building’s internal environment were measured for three climatic seasons in Burkina Faso. The data acquisition system consists of thermocouples, solarimeters and humidity meters, and the data are processed using Excel and Origin Pro software. The results show that, despite the high temperature values (between 36˚C and 39˚C) of the internal environment measured in the hot season, good thermal performance is achieved, in particular an average phase shift of 7.17 h and an average damping of 10.81˚C. The dome-roofed building could therefore contribute to limiting heat transmission to the building interior, improving thermal comfort all year round. Analysis of humidity profiles shows that indoor humidity varies between 66% and 80% for the September period, and between 44% and 69% for the January period. The high values of internal ambient humidity could be reduced by very good ventilation of the building. This study shows that the proposed bioclimatic building prototype with domed roof could be integrated into the Sahelian habitat.

关键词： Thermal Comfort Hygrothermal Behavior Bioclimatic Building Thermal Inertia Domed Roof

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：