检索结果-南通市图书馆

The Drought of Amazonia in 2023-2024

American Journal of Climate Change 2024年第3期13卷 567-597页

作者： Jose A. Marengo Ana P. Cunha Jhan-Carlo Espinoza Rong Fu Jochen Schöngart Juan C. Jimenez Mabel C. Costa Joao M. Ribeiro Sly Wongchuig Siyu Zhao National Center for Monitoring and Early Warning of Natural Disasters/CEMADEN So Jos dos Campos Brazil UNESP/CEMADEN So Jos dos Campos Brazil Graduate School of International Studies Korea University Seoul South Korea institut des Gosciences de lEnvironnement (IGE) Institut de Recherche pour le Dvelopement (IRD) Saint Martin dHeres France instituto de Investigacin sobre la Enseanza de las Matemticas (irem PUCP) Pontificia Universidad Catlica del Per Lima Peru Department of Atmospheric and Oceanic Sciences University of California Los Angeles Los Angeles CA USA Departament of Environmental Dynamics Instituto Nacional de Pesquisas da Amaznia (INPA) Manaus Brazil Global Change Unit (GCU) of the Image Processing Laboratory (IPL) Universitat de Valncia Estudi General (UVEG) Paterna Spain Laboratoire dEtudes en Gophysique et Ocanographie Spatiales (LEGOS) Universit de Toulouse CNES/CNRS/IRD/UT3 Toulouse France

The Amazon basin has experienced an extreme drought that started in the austral summer of 2022-23 and extends into 2024. This drought started earlier than other previous droughts. Although some rain fell during the austral summer, totals remained below average. Higher temperatures during austral winter and spring 2023, which affected most of Central South America, then aggravated drought conditions. This coincided with an intense El Niño and abnormally warm tropical North Atlantic Ocean temperatures since mid-2023. Decreased rainfall across the Amazon basin, negative anomalies in evapotranspiration (derived from latent heat) and soil moisture indicators, as well as increased temperatures during the dry-to-wet transition season, September-October-November (SON) 2023, combined to delay the onset of the wet season in the hydrological year 2023-24 by nearly two months and caused it to be uncharacteristically weak. SON 2023 registered a precipitation deficit of the order of 50 to 100 mm/month, and temperatures +3˚C higher than usual in Amazonia, leading to reduced evapotranspiration and soil moisture indicators. These processes, in turn, determined an exceptionally late onset and a lengthening of the dry season, affecting the 2023-2024 hydrological year. These changes were aggravated by a heat wave from June to December 2023. Drought-heat compound events and their consequences are the most critical natural threats to society. River levels reached record lows, or dried up completely, affecting Amazonian ecosystems. Increased risk of wildfires is another concern exacerbated by these conditions.

关键词： El Niño SST in the Tropical Atlantic Amazon Drought River Levels Heatwave Dry Season Length

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

Elaboration and Properties of Nanocomposite Structures Based on Crown Modified Platinum Nanoparticles

引用

复旦学报（自然科学版） 2007年第5期46卷 703-页

作者： H.Perez S.Cavaliere-jaricot P-A.Albouy A.Etcheberry Laboratoire Francis Perrin CEA/DSM/DRECAM/SPAM-CNRS URA 2453 Bat 52291191 Gif-sur Yvette France Laboratoire Francis Perrin CEA/DSM/DRECAM/SPAM-CNRS URA 2453 Bat 52291191 Gif-sur Yvette FranceInstitut Lavoisier IREM-CNRSUMR 8637Université de Versailles Saint-Quentin en Yvelines45 av.des Etats-Unis78035 Versailles Cedex France Laboratoire de Physique des Solides UMR 8502Bat 510Université Paris-Sud91405 OrsayFrance institut lavoisier irem-cnrs UMR 8637Université de Versailles Saint-Quentin en Yvelines45 av.des Etats-Unis78035 Versailles Cedex France

1 Results This paper presents the development of platinum nanocomposites structures based on organically modified c.a.2 nm core platinum *** chemical modification of the 4-mercaptoaniline functionalized particles by various in coming molecules is evidenced and precisely *** particles can be dissolved like molecules in various solvents depending on the features of the new crown and X-rays shows that the interparticle distance is affected by the crown *** platinum n...

关键词： capped platinum nanoparticles L.B.films oxygen reduction

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

A Local Binary Pattern-Based Method for Color and Multicomponent Texture Analysis

引用

Journal of Signal and Information Processing 2020年第3期11卷 58-73页

作者： Yao Taky Alvarez Kossonou Alain Clément Bouchta Sahraoui Jérémie Zoueu Laboratoire d’Instrumentation Image et Spectroscopie (L2IS) Institut National Polytechnique-Felix Houphou&eumlt Boigny Yamoussoukro C&ocircte d’Ivoire Laboratoire Angevin de Recherche en Ingénierie des Systèmes (LARIS) Université d’Angers Institut Universitaire de Technologie 4 Bd Lavoisier Angers Cedex France institut des Sciences et Technologies Moléculaires d’Angers (MOLTECH ANJOU) UMR cnrs 6200 Université d’Angers 2 Bd Lavoisier Angers Cedex 2 France

Local Binary Patterns (LBPs) have been highly used in texture classification for their robustness, their ease of implementation and their low computational cost. Initially designed to deal with gray level images, several methods based on them in the literature have been proposed for images having more than one spectral band. To achieve it, whether assumption using color information or combining spectral band two by two was done. Those methods use micro structures as texture features. In this paper, our goal was to design texture features which are relevant to color and multicomponent texture analysis without any assumption. Based on methods designed for gray scale images, we find the combination of micro and macro structures efficient for multispectral texture analysis. The experimentations were carried out on color images from Outex databases and multicomponent images from red blood cells captured using a multispectral microscope equipped with 13 LEDs ranging from 375 nm to 940 nm. In all achieved experimentations, our proposal presents the best classification scores compared to common multicomponent LBP methods. 99.81%, 100.00%, 99.07% and 97.67% are maximum scores obtained with our strategy respective

关键词： Multispectral Images Local Binary Patterns (LBP) Texture Analysis Rotation Invariance Illumination Variation Blurring Invariance

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

Ni(II) N-(2-Pyridylmethyl)-L-Alanine) Complex: Structural Diversity and Photoluminiscent Studies

引用

Crystal Structure Theory and Applications 2020年第4期9卷 63-72页

作者： Bridget N. Ndosiri Emmanuel N. Nfor Jérôme Marrot Aminou Mohamadou Justin Nenwa Department of Inorganic Chemistry Faculty of Science University of Yaoundé I Yaoundé Cameroon Department of Chemistry Faculty of Science University of Buea Buea Cameroon Université de Versailles Saint-Quentin-en-Yvelines Institut Lavoisier UMR 8180 Versailles France Université de Reims Champagne-Ardenne Institut de Chimie Moléculaire de Reims (ICMR) CNRS UMR 7312 UFR des Sciences

A novel chiral Nickel (II) complex of N-(2-pyridylmethyl)-L-alanine (Hpyala) 1 has been prepared and structurally characterized by elemental analysis, FT-IR, UV-visible, TGA and single crystal X-ray diffraction techniques. Complex 1 crystallizes in an orthorhombic P212121 space group. The nickel (II) centre in the complex adopts a distorted octahedral geometry. This compound has been seen to exhibit structural diversity resulting from the number of lattice water molecules. The photoluminescent properties of this compound which have also been investigated, indicates the potential application in luminescence.

关键词： Nickel (II) Complex Chiral Photoluminescent X-Ray Diffraction

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

C60-TTF及Ru-oligothienylacetylide复合物的设计合成:新型非线性光诱导效应纳米材料（英文）

引用

光散射学报 2005年第3期 109-110页

作者： B. Sahraoui,Z. Sofiani,A. Migalska-Zalas,I. V. Kityk,S.W. Tkaczyk,J. Berdowski,J.-L. Fillaut3, ,J. Perruchon Laboratoire POMA UMR cnrs 6136 Université d'Angers. 2 Boulevard lavoisier 49045 Angers Cedex France Laboratoire POMA UMR cnrs 6136 Université d'Angers. 2 Boulevard lavoisier 49045 Angers Cedex France Laboratoire POMA UMR cnrs 6136 Université d'Angers. 2 Boulevard lavoisier 49045 Angers Cedex France institute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa Poland institute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa Poland institute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa Poland institut de Chimie de Rennes Université de Rennes I UMR cnrs 6509Laboratoire Organométalliques et Catalyse 35042 Rennes Cedex France

Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communications, integrated optics, optical sensing, optical poling, optical limiting, optical computing etc. A common problem in the laser technology is the protection of human eye and optical sensors from the damaging effects of high-energy light. Passive optical limiters can be the solution of this kind of *** optical materials with large coefficients of TPA and nonlinear refraction are of prime importance in optical limiting applications. Recently the C_ 60-TTF have attracted much attention because of their three-dimensional π-electron conjugated systems which makes them promising as new limiting materials [2]. Two-photon absorption, second harmonic generation （SHG）, detection of phase transition using photoinduced nonlinear effects and illustration of new system for optical recording and erasing of holograms under weak laser illumination will be discussed. In other hand a series of new Donor-π-Acceptor ruthenium acetylide systems built around thiophene-based π-conjugating spacers has been developed and studied, in terms of the oligothienyl chain length. Comparison of the linear and third-order nonlinear optical properties of these Donor-π-Acceptor chromophores shows that the elongation of the spacer and introduction of a double bond in this spacer produces a considerable bathochromic shift of the absorption maximum together with a dramatic enhancement of the molecular cubic hyperpolarizability in these systems. Finally, acoustically induced second harmonic generation （AISHG） has been observed for thin films of these complexes incorporated in PMMA matrices, which reaches values among the highest, reported so far.

关键词： TTF Ru-oligothienylacetylide

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

C_(60)-TTF及Ru-oligothienylacetylide复合物的设计合成:新型非线性光诱导效应纳米材料(英文)

引用

光散射学报 2005年第3期17卷 297-298页

作者： B. Sahraoui Z. Sofiani A. Migalska-Zalas I. V. Kityk S.W. Tkaczyk J. Berdowski J.-L. Fillaut3 J. Perruchon Laboratoire POMA UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceLaboratoire POMA UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceLaboratoire POMA UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitut de Chimie de Rennes Université de Rennes I UMR CNRS 6509Laboratoire Organométalliques et Catalyse 35042 Rennes Cedex France

Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communications, integrated optics, optical sensing, optical poling, optical limiting, optical computing etc. A common problem in the laser technology is the protection of human eye and optical sensors from the damaging effects of high-energy light. Passive optical limiters can be the solution of this kind of *** optical materials with large coefficients of TPA and nonlinear refraction are of prime importance in optical limiting applications. Recently the C_ 60-TTF have attracted much attention because of their three-dimensional π-electron conjugated systems which makes them promising as new limiting materials [2]. Two-photon absorption, second harmonic generation (SHG), detection of phase transition using photoinduced nonlinear effects and illustration of new system for optical recording and erasing of holograms under weak laser illumination will be discussed. In other hand a series of new Donor-π-Acceptor ruthenium acetylide systems built around thiophene-based π-conjugating spacers has been developed and studied, in terms of the oligothienyl chain length. Comparison of the linear and third-order nonlinear optical properties of these Donor-π-Acceptor chromophores shows that the elongation of the spacer and introduction of a double bond in this spacer produces a considerable bathochromic shift of the absorption maximum together with a dramatic enhancement of the molecular cubic hyperpolarizability in these systems. Finally, acoustically induced second harmonic generation (AISHG) has been observed for thin films of these complexes incorporated in PMMA matrices, which reaches values among the highest, reported so far.

关键词： C60-TTF Ru-oligothienylacetylide 复合物非线性光诱导效应纳米材料纳米光子

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

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

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：