检索结果-南通市图书馆

Large-scale industrial manufacturing of carbon nanotubes in a continuous inclined mobile-bed rotating reactor via the catalytic chemical vapor deposition process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2017年第2期11卷 280-289页

作者： Sophie L. Pirard Sigrid Douven jean-paul Pirard Laboratory of Chemical Engineering Department of Chemical Engineering University of Liege B-4000 Liege Belgium

This article reports the different steps of the design, development and validation of a process for continuous production of carbon nanotubes （CNTs） via catalytic chemical vapor deposition from the laboratory scale to the industrial production. This process is based on a continuous inclined mobile-bed rotating reactor and very active catalysts using methane or ethylene as carbon source. The importance of modeling taking into account the hydrodynamic, physicochemical and physical phenomena that occur during CNT production in the process analysis is emphasized. The impact of this invention on the environment and human health is taken into consideration too.

关键词： carbon nanotubes catalytic chemical vapor deposition inclined rotating reactor industrial process scaling-up

Covalent functionalization/polycarboxylation of tungsten disulfide inorganic nanotubes （INTs-WS2）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2015年第5期8卷 1454-1463页

作者： Daniel Raichman David A. Strawser jean-paul Lellouche Department of Chemistry Nanomaterials Research Center Institute of Nanotechnology & Advanced Materials Bar-Ilan University Ramat-Gan 5290002 Israel

Inorganic nanotubes of tungsten disulfide （INTs-WS2） are insoluble in common solvents and practically inert, hindering their usefulness in both research and commercial applications. The covalent attachment of functional species onto the surface of INT-WS2 is a critical first step in realizing the potential that INT-WS2 offer for high-performance materials and products. Although a few attempts have been reported regarding preparing modified nanotubes, only a limited range of surface functionalities is possible with these methods. We have developed a versatile method, based on a modified, highly electrophilic acidic Vilsmeier- Haack reagent, to produce covalently bonded, polycarboxylated functional WS2 nanotubes that are dispersible in polar liquids, including water. The surface polycarboxylated shell provides a means for additional derivatization, enabling matching compatibility of derivatized nanotubes to both hydrophobic and hydrophilic materials. Nanocomposites incorporating derivatized INT-WS2 are expected to show improved properties as a result of enhanced interfacial compatibility, made possible by the large number of classes of functionalization available through the initial polycarboxylation step.

关键词： tungsten disulfide nanotubes inorganic nanotube of tungsten disulfide(INT-WS2) Vilsmeier-Haack reagents polycarboxylation inorganic nanotube functionalization

Hybridisation on coral reefs and the conservation of evolutionary novelty

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2015年第1期61卷 132-145页

作者： Zoe T. RICHARDS jean-paul A. HOBBS Department of Aquatic Zoology Western Australian Museum Welshpool WA 6015 Australia Department of Environment and Agriculture Curtin University Bentley WA 6845 Australia

Hybridisation was traditionally considered rare on coral reefs. However, a rapid increase in hybrid studies over the last 20 years has revealed that hybridisation on coral reefs is common and widespread. In this review, we summarise the growing body of evidence arising from studies on stony corals and reef fishes to verify the occurrence of hybridisatiori, and we examine the influence hybridisation has had on the enormous level of biodiversity present on coral reefs. We discuss the challenges of dis- tinguishing hybridisation from alternative hypotheses （e.g. incomplete lineage sorting）. This review also explores the evolutio- nary consequences of hybridisation, which range from increasing genetic diversity and the production of novel lineages that may outperform the parent species, to reverse speciation and extinction by genetic swamping. Instances of hybridisation can be natural or occur as a result of human impacts （e.g. habitat degradation） and distinguishing between these two very different causal me- chanisms is important for management. Currently, the legislative status of hybrids is unclear and hybrids are rarely protected in conservation programs. Failing to adequately manage hybridisation and hybrid lineages may lead to potential losses of evolutio- nary novelty, declines in phylogenetic diversity or species extinctions. To conserve existing coral reef biodiversity, and the processes that generate biodiversity, conservation policies must be re-defined and instances of hybridisation must be assessed and managed on a case-by-case basis [Current Zoology 61 （1）： 132 145, 2015].

关键词： Coral Reefs Stony Corals Reef Fish Hybridisation Evolutionary Novelty Extinction

Accurate surface potential determination in Schottky diodes by the use of a correlated current and capacitance voltage *** to n-InP

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第10期32卷 39-43页

作者： Ali Ahaitouf Abdelaziz Ahaitouf jean paul Salvestrini Hussein Srour Laboratoire Signaux Systemes et Composants DGE Faculty of Sciences and TechnologyUniversite Sidi Mohammed Ben AbdellahP.O.Box 2202FES Morocco LIMAO Faculte polydisciplinaire de Taza Universite Sidi Mohammed Ben Abdellah de FesBP 1223 Taza-GareMorocco Laboratoire Materiaux Optiques Photonique et SystemesEA 4423Universite Paul Verlaine-MetzSupelec2 rue E.Belin57070 MetzFrance

Based on current voltage（I-Vg） and capacitance voltage（C-Vg） measurements,a reliable procedure is proposed to determine the effective surface potential Vd（Vg） in Schottky *** the framework of thermionic emission,our analysis includes both the effect of the series resistance and the ideality factor,even voltage dependent. This technique is applied to n-type indium phosphide（n-InP） Schottky diodes with and without an interfacial layer and allows us to provide an interpretation of the observed peak on the C-Vg *** study clearly shows that the depletion width and the flat band barrier height deduced from C-Vg,which are important parameters directly related to the surface potential in the semiconductor,should be estimated within our approach to obtain more reliable information.

关键词： Schottky diode interface states surface potential ideality factor barrier height capacitance voltage current measurements

Signs as Creators of Thought Processes

在线全文

学校读者我要写书评

暂无评论

Language and Semiotic Studies 2022年第1期8卷 105-113页

作者： jean-paul Bronckart University of Geneva Switzerland

This paper elaborates on some of Saussure’s reflections on the structure of signs,and the role these signs play in the constitution of conscious *** the notes of La double essence,Saussure argued that the sign “creates” and “guides” thought,but as part of a reflection that is both complex and *** clarify this position and examine its relevance,we first analyze the general conception of the status of signs and semiotics,that Saussure developed in his Course *** then examine the way in which,in the twentieth century,the problem of how human thought is constituted was tackled by Piaget and ***,drawing on the notes of La double Essence,we try to highlight the arguments that led Saussure to adopt the position quoted below,and we will show how Saussure’s approach provides decisive arguments in support of the social interactionist position inherited from Vygotsky.

关键词： development semiotics sign thought process Vygotsky

Fast Multi-Operator Image Resizing and Evaluation

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2012年第1期27卷 121-134页

作者： Wei-Ming Dong Guan-Bo Bao Xiao-Peng Zhang jean-Claude paul Sino-French Laboratory for Computer Science Automation and Applied Mathematics/National Laboratory of Pattern RecognitionInstitute of AutomationChinese Academy of SciencesBeijing 100190China National Institute for Research in Computer Science and Control Domaine de Voluceau Rocquencourt Le Chesnay 78153France

Current multi-operator image resizing methods succeed in generating impressive results by using image similarity measure to guide the resizing process. An optimal operation path is found in the resizing space. However, their slow resizing speed caused by inefficient computation strategy of the bidirectional patch matching becomes a drawback in practical use. In this paper, we present a novel method to address this problem. By combining seam carving with scaling and cropping, our method can realize content-aware image resizing very fast. We define cost functions combing image energy and dominant color descriptor for all the operators to evaluate the damage to both local image content and global visual effect. Therefore our algorithm can automatically find an optimal sequence of operations to resize the image by using dynamic programming or greedy algorithm. We also extend our algorithm to indirect image resizing which can protect the aspect ratio of the dominant object in an image.

关键词： image resizing multi-operator operator cost indirect resizing

Oxidative dehydrogenation of propane under steady-state and transient regimes over alumina-supported catalysts prepared from mixed V_2W_4O_(19)^(4-) hexametalate precursors

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第2期19卷 123-133页

作者： Sébastien paul Elise Berrier Marcia Cristina Kaezer Frana jean-Guillaume Eon Univ Lille Nord de France F-59000 LilleFrance ECLille UCCSF-59650 Villeneuve d'AscqFrance CNRS UMR 8181F-59650 Villeneuve d'AscqFrance USTL UCCSF-59650 Villeneuve d'AscqFrance Instituto de Quimíca Universidade Federal do Rio de Janeiro-Cidade UniversitáriaIlha do Fundo21945-970 Rio de JaneiroBrazil

An integrated approach combining the development of an innovative catalyst and the research of a set of adequate operating conditions for the propane oxidative dehydrogenation （ODH） is *** experimental set-up,specially designed for steady-state and transient studies is *** preparation method,the characterization and the performances in steady-state and transient regimes of catalysts based on V2W4O194-Lindqvist isopolyanion used as a precursor and supported on alumina are *** influence of the preparation method of the catalyst and the role of water in the feed gas are more particularly discussed.

关键词： propane oxidative dehydrogenation (ODH) transient regime pulsed reactor Lindqvist isopolyanion in-situ Raman

High frequency of severe liver dysfunction in critically ill Dengue patients in the French West Indies

在线全文

学校读者我要写书评

暂无评论

Journal of Intensive Medicine 2024年第3期4卷 403-404页

作者： Laurent Camous Samuel Markowicz Cecile Loraux Julien Jabot jean David Pommier Réanimation Médicale et Chirurgicale CHU de GuadeloupeChemin ChauvelLes Abymes97139 GuadeloupeFrance Service de Maladies infectieuses et tropicales CHU de GuadeloupeChemin ChauvelLes Abymes97139 GuadeloupeFrance Service de Microbiologie CHU de GuadeloupeChemin ChauvelLes Abymes97139 GuadeloupeFrance Médecine Intensive et Réanimation Centre hospitalier universitaire de la Réunion 97460 Saint-PaulFrance Institut Pasteur de la Guadeloupe Morne Jolivière97183 AbymesFrance

Dear Editor,Dengue is a worldwide zoonosis,transmitted by mosquitoes and highly prevalent in tropical and subtropical *** recent years,its incidence has increased with a massive healthcare burden worldwide[1]and recent climatic changes have expanded the geographic range of the insect vector with described outbreaks in Europe.[2]Most patients present pauci-symptomatic infections,but some patients could present severe manifestations with high reported mortality[[3],[4],[5]]and no specific *** bleeding,hemodynamic failure and various organ damage(cardiac,renal,neurological,and hepatic)are described in severe dengue(SD)patients.[5]In the future,intensivists worldwide will be increasingly treating SD and the spectrum of severe organ impairment should be well known.

关键词： patients mortality expanded

Formal verification of synchronous data-flow program transformations toward certified compilers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2013年第5期7卷 598-616页

作者： Van Chan NGO jean-Pierre TALPIN Thierry GAUTIER paul Le GUERNIC Loic BESNARD INRIA Rennes-Bretagne Atlantique Rennes 35042 France IRISA/CNRS Rennes 35042 France

Translation validation was invented in the 90＇s by Pnueli et al. as a technique to formally verify the correctness of code generators. Rather than certifying the code generator or exhaustively qualifying it, translation validators attempt to verify that program transformations preserve semantics. In this work, we adopt this approach to formally verify that the clock semantics and data dependence are preserved during the compilation of the Signal compiler. Translation valida- tion is implemented for every compilation phase from the initial phase until the latest phase where the executable code is generated, by proving the transformation in each phase of the compiler preserves the semantics. We represent the clock semantics, the data dependence of a program and its trans- formed counterpart as first-order formulas which are called clock models and synchronous dependence graphs （SDGs）, respectively. We then introduce clock refinement and depen- dence refinement relations which express the preservations of clock semantics and dependence, as a relation on clock mod- els and SDGs, respectively. Our validator does not require any instrumentation or modification of the compiler, nor any rewriting of the source program.

关键词： formal verification translation validation certi-fied compiler multi-clocked synchronous programs embed-ded systems.