检索结果-南通市图书馆

Impact of Climate Variability on Water resources: The Case of Marc Delorme-Cnra Station, Southeast of Ivory Coast

journal of Water resource and Protection 2021年第9期13卷 726-749页

作者： Charly Fernand Agoh Tacra Thierry Lekadou Mahaman Bachir Saley bi trazié jérémie gala jean Homian Danumah Pierre-Marie janvier Coffi Zadjéhi Eric-Blanchard Koffi bi Tié Albert Goula Laboratory of Water and Environmental Sciences and Techniques (LSTEE) UFR of Earth Sciences and Mineral Resources (STRM) Felix Houphou&euml t Boigny University Abidjan Ivory Coast National Agronomic research Center Marc Delorme Research Station Abidjan Ivory Coast Laboratory Geosciences and Environment Training and Research Unit of Environmental Sciences and Management (UFR) of Environmental Sciences and Management Nangui Abrogoua University (UNA) Abidjan Ivory Coast Laboratory of biology and Improvement of Plant Productions UFR Sciences de la Nature Peleforo Gon Coulibaly University Korhogo Ivory Coast

This study aims to characterize the climatic variability in the South-East of Ivory Coast and to show its impact on the supply of water resources. To do this, statistical and hydrological methods were applied to climatic data collected at the Marc DELOrME research Station of the CNrA. The statistical trend tests on this data revealed a significant decrease in precipitation and an increase in temperature, insolation and evaporation. Statistical break methods indicate a rainfall break in 1982 which marks a modification of the rainfall regime thus translating a drop in rainfall of 15%, a recession in the frequency of rainy days in general and in particular in rainfall heights between 10 and 30 mm and greater than 50 mm. This break is accompanied by a shortening of the rainy seasons, with average rainfall durations ranging from 54 days (short rainy season) to 104 days (great rainy season). Despite the disturbances in the different seasons of the year, the monthly rainfall regimes in the area have not changed. The assessment of the effects of drought on water resources using the Standardized Precipitation and Evapotranspiration Index (SPEI) for three-time scales (1 month, 3 months and 12 months) indicates a severe drought ranging from 3% to 7% over the period 1961 to 2018. However, despite the presence of this severe drought, the intensity of the drought was found to be moderate on all time scales. The Thorrnthwaite method was used to highlight the impacts of this climatic variability on the region’s water resources. The average annual recharge estimated at 402 mm, has been reduced to 153 mm during a deficit period, a decrease of about 62%. The average annual runoff, which was 294 mm, fells to 257 mm, a decrease of about 13%. This recorded decrease in the water infiltrated after the rainfall break (1983-2018), explains the heterogeneous decrease in the depth of the water table.

关键词： Climate Variability Drought Statistical Tests Water resource Ivory Coast

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

Use of Fluorescence and reflectance Spectra for Predicting Okra (<i>Abelmoschus esculentus</i>) Yield and Macronutrient Contents of Leaves

引用

Open journal of Applied Sciences 2017年第10期7卷 537-558页

作者： Wilfried G. Dibi jocelyne Bosson Irié Casimir Zobi bi Tra Tié jérémie T. Zoueu Laboratoire d’Instrumentation Image et Spectroscopie Unité Mixte de Recherche et d’Innovation en Electricité et Electronique Appliquées Ecole Supérieure d’Industrie Institut Nationale Polytechnique Houphouet-Boigny Yamoussoukro C&ocirc te d’Ivoire Laboratoire de Physique Fondamentale et Appliquée Unité de Formation et de Recherche en Sciences Fondamentales et Appliquées Université Nangui Abrogoua Abidjan C&ocirc te d’Ivoire Laboratoire de Pédologie Ecole Supérieure d’Agronomie Institut Nationale Polytechnique Houphouet-Boigny Yamoussoukro C&ocirc te d’Ivoire

In-field proximal sensing of most major crops nutrients still remains an economical and technical challenge. For this purpose, the use of effective multi-excitation fluorescence and reflectance wavelengths is explored in this work on Okra plant. Visible-near infrared (400 - 1000 nm) reflectance and multi-fluorescence data were collected at leaf scale in a chemically fertilized field by using an USB spectrometer mounted with an Arduino-based LED driver clip. N, P, K and Ca content of samples leaves were measured using reference methods. Average pods yield and leaves macronutrients content were calibrated using IrIV-PLS regression after spectra pretreatments. Single informative wavelengths bands in reflectance, red and far-red fluorescences were selected for building yield and macronutrient content models. We showed that flowering stage was more suitable for yield prediction. Moderately useful macronutrient models were found in Ca content (rPDval = 1.93, rP = 0.818) and potassium content with rPDval = 1.8, rP = 0.88. P and N yielding prediction performance of rPDval = 1.61 (rP = 0.718 ) and rPDval = 1.46 (rP = 0.56) respectively were less accurate. This study demonstrates potentiality of fluorescence and reflectance spectroscopy for accurate estimation of leaf macronutrient content and crop yield. High selectivity obtained from resulted spectral bands could lead to the development of reliable, rapid and cost-effective devices for nutrient diagnosis.

关键词： Proximal Sensing Fluorescence and reflectance Fertilized Field Macronutrients Content Pods Yield

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

Detection of Burned Areas through Spectral Indices Analysis of Sentinel-2A Satellite Images in the Abokouamékro Wildlife reserve (Central, Côte D’Ivoire)

引用

Open journal of Applied Sciences 2024年第1期14卷 205-222页

作者： Bob Kouakou Kouadio Sié Ouattara Alain Clément jean-Marc gala bi Zaouri jean-Luc Kouadio Kouassi jean-Luc Edouard Kouakou N’guessan Laboratoire des Sciences et Technologies de la Communication et de l’Information (LSTCI) Institut National Polytechnique Houphou&#235t Boigny (INP-HB) Yamoussoukro C&#244te d’Ivoire Laboratoire des Sciences Agronomiques et Génie rural Institut National Polytechnique Houphou&#235t Boigny (INPHB) Yamoussoukro C&#244te d’Ivoire Ecole de Géomatique et du Territoire (EGT) Abidjan C&#244te d’Ivoire LArIS SFR MATHSTIC Université d’Angers Angers France Centre Universitaire de recherche et d’application en Télédétection (CUrAT) UFR des Sciences de la Terre et des Ressources Minières Abidjan C&#244te d’Ivoire Laboratoire de Botanique UFR Biosciences Université Félix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire

In Côte d’Ivoire, the recurring and unregulated use of bushfires, which cause ecological damage, presents a pressing concern for the custodians of protected areas. This study aims to enhance our comprehension of the dynamics of burnt areas within the Abokouamékro Wildlife reserve (AWr) by employing the analysis of spectral indices derived from satellite imagery. The research methodology began with the calculation of mean indices and their corresponding spectral sub-indices, including NDVI, SAVI, NDWI, NDMI, BAI, NBr, TCW, TCG, and TCB, utilizing data from the Sentinel-2A satellite image dated january 17, 2022. Subsequently, a fuzzy classification model was applied to these various indices and sub-indices, guided by the degree of membership α, with the goal of effectively distinguishing between burned and unburned areas. Following the classification, the accuracies of the classified indices and sub-indices were validated using the coordinates of 100 data points collected within the AWr through GPS technology. The results revealed that the overall accuracy of all indices and sub-indices declines as the degree of membership α decreases from 1 to 0. Among the mean spectral indices, NDVI-mean, SAVI-mean, NDMI-mean exhibited the highest overall accuracies, achieving 97%, 95%, and 90%, respectively. These results closely mirrored those obtained by sub-indices using band 8 (NDVI-B8, SAVI-B8, and NDMI-B8), which yield respective overall accuracies of 93%, 92%, and 89%. At a degree of membership α = 1, the estimated burned areas for the most effective indices encompassed 2144.38 hectares for NDVI-mean, 1932.14 hectares for mean SAVI-mean, and 4947.13 hectares for mean NDMI-mean. A prospective approach involving the amalgamation of these three indices could have the potential to yield improved outcomes. This study could be a substantial contribution to the discrimination of bushfires in Côte d’Ivoire.

关键词： Spectral Indices Wildfire Burned Areas Abokouamékro Wildlife reserve Côte D’Ivoire

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

Formation and Optical Absorption of Photo-reduced Gold Nanoparticles Inside Pores of Mesoporous Silica

引用

Chinese Physics Letters 2000年第7期17卷 537-539页

作者： SHI Hua-Zhong YAO Bao-Dian ZHANG Li-De bi Hui-juan CAI Wei-ping WU Yu-cheng Institute of Solid State Physics Chinese Academy of SciencesHefei 230031

Mesoporous silica with gold nanoparticles inside its pores was synthesized by soaking and photo-reduction method. This new material was characterized by transmission electron microscopy, x-ray photoelectron spectroscopy and Brunauer-Emmett-Teller techniques. The results showed that gold nanoparticles were isolated from each other and uniformly dispersed inside the pores of silica, most of which were less than 4 nm in diameter. It was found that in optical absorption spectrum, surface plasma resonance peak of nanosized gold particles assumed a significant redshift (about 55nm) with respect to that predicted by mie theory. This can be explained in terms of interface interaction (boundary coupling) between gold particles and pore walls of porous silica.

关键词： theory method silica

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

少数民族传统文化现代转化的规律与策略研究——以恩施土家“女儿会”为例

引用

华中师范大学学报（人文社会科学版） 2021年第6期60卷 78-85页

作者：毕曼湖北民族大学文学与传媒学院湖北恩施445000

在文化产业大发展的背景下,探索有效的开发利用模式,实现文化资源的产业转化,既是发展我国特色文化产业的必然选择,也是文化传承与发展的必然需求。恩施土家“女儿会”是湖北恩施地区一种独特的节俗文化,其现代建构过程实际上就是其慢... 详细信息

在文化产业大发展的背景下,探索有效的开发利用模式,实现文化资源的产业转化,既是发展我国特色文化产业的必然选择,也是文化传承与发展的必然需求。恩施土家“女儿会”是湖北恩施地区一种独特的节俗文化,其现代建构过程实际上就是其慢慢走上产业化道路的过程。借用布迪厄的“场域”—“资本”理论,对以恩施土家“女儿会”为代表的少数民族传统文化的产业转化给予系统分析,可发现其经历了现代建构的过程,表现在活动空间的移置、形式内容的重组、主体对象的变更、功能价值的增强四个方面,体现出由生活场域转向经济场域、文化资源转向文化资本的变迁规律。少数民族传统文化转化的主要策略有:以民族文化唤醒“集体记忆”,增强民族的凝聚力;以差异表征打造“独特产品”,实现文化的产业化。在转化中还应充分尊重少数民族文化的价值,避免经济诉求与文化本位的冲突。

关键词：少数民族传统文化现代转化文化产业恩施土家“女儿会”

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

Measurement of aerosol effective density by single particle mass spectrometry

引用

Science China Earth Sciences 2016年第12期59卷 320-327页

作者： ZHANG GuoHua bi XinHui HAN bingXue QIU Ning DAI ShouHui WANG XinMing SHENG GuoYing FU jiaMo Guangzhou Institute of Geochemistry Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences South China Sea Institute of Oceanology Chinese Academy of Sciences

Single particle mass spectrometry has been widely used to determine the size and chemical compositions of at- mospheric aerosols; however, it is still rarely used for the microphysical properties measurement. In this study, two methods were developed for determining aerosol effective density by a single particle aerosol mass spectrometer （SPAMS）. Method I retrieved effective density through comparison between measured light scattering intensities and mie theoretical modelled par- tial scattering cross section. Method Ⅱ coupled a differential mobility analyzer （DMA） with SPAMS to simultaneously deter- mine the electric mobility and vacuum aerodynamic diameter, and thus the effective density. Polystyrene latex spheres, ammo- nium sulfate and sodium nitrate were tested by these methods to help validate their effectiveness for determining the aerosol effective density. This study effectively extends SPAMS measurements to include particle size, chemical composition, light scattering, and effective density, and thus helps us better understand the environment and climate effects of aerosols.

关键词： Effective density Single particle SPAMS mie theory DMA

来源：

维普期刊数据库

同方期刊数据库

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

水稻脂肪含量近红外模型的创建及在航天育种上的应用

引用

广东农业科学 2011年第11期38卷 30-32,38页

作者：陈晓玲邝碧玉张芳英谢振文仲恺农业工程学院园艺园林学院广东广州510225 仲恺农业工程学院生命科学学院广东广州510225 仲恺农业工程学院农学院广东广州510225

利用近红外分析仪,对59份航天水稻种子进行光谱扫描,并用国标化学法对其脂肪含量进行测定。通过近红外定标软件(WinISI III),采用多种计量数学处理方法和不同的回归统计方法进行定标曲线的开发和比较,建立并优化了水稻脂肪含量测定的近... 详细信息

利用近红外分析仪,对59份航天水稻种子进行光谱扫描,并用国标化学法对其脂肪含量进行测定。通过近红外定标软件(WinISI III),采用多种计量数学处理方法和不同的回归统计方法进行定标曲线的开发和比较,建立并优化了水稻脂肪含量测定的近红外分析定标模型,其定标标准偏差(SEC)、交叉检验标准误差(SECV)和定标决定系数(rSQ)分别为0.0257、0.0645、0.9939,应用该定标方程可快速测定水稻脂肪含量,对于航天育种稻种资源的快速鉴定及营养品质改良具有重要意义。

关键词：水稻近红外透射光谱粗脂肪含量航天育种

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

催化剂颗粒浓度在线检测系统的研究与开发

引用

计算机工程与设计 2008年第17期29卷 4614-4617页

作者：段中兴邵必林西安建筑科技大学信息与控制工程学院陕西西安710055 西安建筑科技大学管理学院陕西西安710055

基于mie光散射理论,开发了石油炼化装置烟气催化剂颗粒浓度在线检测系统,采用了基于最小二乘支持向量机(least square support vector machine,LS-SVM)的软测量技术。利用LS-SVM优良的非线性映射和强大的泛化能力,建立了颗粒浓度的软测... 详细信息

基于mie光散射理论,开发了石油炼化装置烟气催化剂颗粒浓度在线检测系统,采用了基于最小二乘支持向量机(least square support vector machine,LS-SVM)的软测量技术。利用LS-SVM优良的非线性映射和强大的泛化能力,建立了颗粒浓度的软测量模型,通过LS-SVM的学习和支持向量的自适应更新,实现催化剂颗粒浓度的最佳估计。仿真和实际运行结果表明所开发的监测系统可对烟气催化剂颗粒浓度进行有效测量,其测量精度比经验公式提高4.2倍。

关键词：最小二乘支持向量机软测量催化剂粉尘浓度光散射法

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

可回收性腔静脉滤器在预防上腔静脉系统血栓所致肺栓塞的效果

引用

血栓与止血学 2018年第3期24卷 388-390页

作者：周敏孙骁王春丽方垂璧王凤丹上海交通大学医学院附属第九人民医院心脏外科上海201900 上海交通大学医学院附属第九人民医院心脏内科上海201900

目的探究可回收性腔静脉滤器在预防上腔静脉系统血栓所致的肺栓塞的有效性以及安全性。方法随机选取我院2016年2月29日至2017年8月28日符合可回收性腔静脉滤器置入指证的上腔静脉系统血栓患者35例,进入观察组,行上腔静脉腔静脉滤器置入... 详细信息

目的探究可回收性腔静脉滤器在预防上腔静脉系统血栓所致的肺栓塞的有效性以及安全性。方法随机选取我院2016年2月29日至2017年8月28日符合可回收性腔静脉滤器置入指证的上腔静脉系统血栓患者35例,进入观察组,行上腔静脉腔静脉滤器置入术,同期随机选取未行上腔静脉滤器的上腔静脉系统血栓患者35例,进入对照组。统计分析观察组患者行该手术的术中、术后有无出现相关并发症,同时统计分析两组患者有无新发肺栓塞及原有肺栓塞加剧。结果上腔静脉滤器植入术术中术后并发症较少(4/35),可回收率高(95%),并且观察组比对照组的肺栓塞或者肺栓塞加重的比率更低(2/35 v.s 10/35),差异有统计学意义。结论可回收性腔静脉滤器在预防上腔静脉系统血栓导致的肺栓塞方面具有较高的有效性和安全性。

关键词：上腔静脉系统血栓上腔静脉滤器肺栓塞

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

均细化处理对苹果细胞壁多糖结构特性的影响

引用

中国食品学报 2020年第10期20卷 96-104页

作者：曹风刘璇毕金峰张彪吴昕烨李潇大连工业大学食品学院辽宁大连116034 中国农业科学院农产品加工研究所农业农村部农产品加工重点实验室北京100193

为研究均细化处理对苹果细胞壁多糖的影响,采用湿法超细精磨和高压均质处理苹果浊汁,研究苹果浊汁中细胞壁多糖(AIr)半乳糖醛酸(gala)含量、甲酯化度(DM)、重均分子质量(Mw)、数均分子质量(Mn)、中性糖含量以及结构官能团的差异性。结... 详细信息

为研究均细化处理对苹果细胞壁多糖的影响,采用湿法超细精磨和高压均质处理苹果浊汁,研究苹果浊汁中细胞壁多糖(AIr)半乳糖醛酸(gala)含量、甲酯化度(DM)、重均分子质量(Mw)、数均分子质量(Mn)、中性糖含量以及结构官能团的差异性。结果表明,gala含量随均质次数的增加及进料温度的升高而增多。DM随均质压力、均质次数及进料温度的增加呈不断升高的趋势,均细化处理样品的DM均大于60%,即各样品为高酯化度果胶。随着均质压力的增加,Mw呈不断减小的趋势,Mw/Mn除均质压力30 MPa处理外与Mw变化趋势相同;随着均质次数的增加,Mw/Mn呈不断降低的趋势;随进料温度的升高,Mw呈不断增大的趋势。均细化处理样品后,中性糖含量中葡萄糖含量最高,其次是半乳糖含量。以上结果揭示了均细化处理参数对AIr结构特性的影响,为后续生产高品质的果汁提供理论基础。

关键词：苹果浊汁细胞壁多糖均细化处理高压均质

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

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：