检索结果-南通市图书馆

Fragrant Microcapsules Based onβ-Cyclodextrin for Cosmetotextile Application

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第12期7卷 1347-1362页

作者： Maroua Ben Abdelkader Nedra Azizi Ayda Baffoun Yves Chevalier Mustapha Majdoub Laboratoire des Interfaces et Matériaux Avancés(LIMA) Facultédes SciencesUniversitéde Monastirbd de l’Environnement5019 MonastirTunisia Laboratoire d’Automatique de Génie des Procédés et de Génie Pharmaceutique(LAGEPP)UniversitéClaude Bernard Lyon 1UMR CNRS 500743 bd du 11 Novembre 191869622 Villeurbanne CedexFrance unitéde Recherche Matériaux et Procédés Textiles Universitéde MonastirÉcole Nationale d’Ingénieurs de Monastirav.Ibn Eljazzar5019 MonastirTunisia

Microencapsulation of neroline inside microcapsules having a polyurethane shell based onβ-cyclodextrin(β-CD)and hexane diisocyanate was performed by interfacial *** polyol nature ofβ-CD caused tight crosslinking of microcapsules *** of neroline were characterized for their chemical composition and structure of the polyurethane shell by FTIR spectroscopy,thermogravimetric analysis,optical and electron microscopy,light scattering and electrophoresis *** content and encapsulation yield were 15%and 60%,*** microcapsules of mean diameter 29μm were slightly cationic with an isoelectric point of ***-loaded microcapsules were fixed on cotton fabric using an impregnation *** functionalized fabric showed improved resistance to washing cycles in comparison with previously reported diol-based *** microcapsules display great potential for the long-lasting release of fragrance in the framework of cosmetotextile.

关键词： Microcapsules interfacial polycondensation β-cyclodextrin neroline cosmetotextile

Problematic Use of Video Games in schools in Northern Benin (2023)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Psychiatry 2024年第2期14卷 120-141页

作者： Ireti Nethania Elie Ataigba David sinet Koivogui Damega Wenkourama Marcos Tohou Eurydice Elvire Djossou Anselme Djidonou Francis Tognon Tchegnonsi Prosper Gandaho Josiane Ezin Houngbe Faculté de Médecine & Institut de Formation en soins Infirmiers et Obstétricaux Université de Parakou Parakou Bénin service de Psychiatrie Centre Hospitalier Universitaire Départemental du Borgou Alibori Parakou Bénin Organisation Non Gouvernementale de soutien Réhabilitation Insertion et Réinsertion (souRIR ONG) Parakou Bénin Faculté des sciences et Techniques de santé Université Gamal Abder Nasser de Conakry Conakry Guinée Faculté des sciences de la santé Université de Kara Kara Togo service de Psychiatrie Centre Hospitalier Universitaire de Kara Kara Togo Facultés des sciences de la santé Université d’Abomey-Calavi Cotonou Bénin Centre nationale Hospitalier Universitaire Hubert Koutoucou Maga de Cotonou Cotonou Bénin

Objective: To study the problematic use of video games among secondary school students in the city of Parakou in 2023. Methods: Descriptive cross-sectional study conducted in the commune of Parakou from December 2022 to July 2023. The study population consisted of students regularly enrolled in public and private secondary schools in the city of Parakou for the 2022-2023 academic year. A two-stage non-proportional stratified sampling technique combined with simple random sampling was adopted. The Problem Video Game Playing (PVP) scale was used to assess problem gambling in the study population, while anxiety and depression were assessed using the Hospital Anxiety and Depression scale (HADs). Results: A total of 1030 students were included. The mean age of the pupils surveyed was 15.06 ± 2.68 years, with extremes of 10 and 28 years. The [13 - 18] age group was the most represented, with a proportion of 59.6% (614) in the general population. Females predominated, at 52.8% (544), with a sex ratio of 0.89. The prevalence of problematic video game use was 24.9%, measured using the Video Game Playing scale. Associated factors were male gender (p = 0.005), pocket money under 10,000 cfa (p = 0.001) and between 20,000 - 90,000 cfa (p = 0.030), addictive family behavior (p s family (p = 0.023), good relationship with father (p = 0.020), organization of video game competitions (p = 0.001) and definite anxiety (p Conclusion: substance-free addiction is struggling to attract the attention it deserves, as it did in its infancy everywhere else. This study complements existing data and serves as a reminder of the need to focus on this group of addictions, whose problematic use of video games remains the most frequent due to its accessibility and social tolerance. Preventive action combined with curative measures remains the most effective means of combating the problem at national level.

关键词： Gaming Problem Video Games Benin 2023

Habits on social Networks at Workplace: A survey of Motivations and Behaviour

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied sciences 2024年第8期14卷 2154-2168页

作者： Thomas Kakou Kouassi Douatia Koné Aliou Bamba Aladji Kamagaté Olivier Asseu Yvon Kermarrec Laboratoire des sciences et Technologies de lInformation et de la Communication (LAsTIC) Ecole Superieure Africaine des TIC (ESATIC) Abidjan Cte dIvoire Institut National Polytechnique Houphout Boigny (INPHB) Yamoussoukro Cte dIvoire Departement de Mathematiques Physique et Chimie Universit Plforo Gon Coulibaly (UPGC) Korhogo Cte dIvoire Agence nationale de la Recherche (ANR) Paris France Laboratoire des sciences et Techniques de linformation de la Communication et de la Connaissance (Lab-sTICC) IMT Atlantique Brest France

This article explores the use of social networks by workers in Abidjan, Côte d’Ivoire, with particular emphasis on a descriptive or quantitative analysis aimed at understanding motivations and methods of use. More than five hundred and fifty questionnaires were distributed, highlighting workers’ preferred digital channels and platforms. The results indicate that the majority use social media through their mobile phones, with WhatsApp being the most popular app, followed by Facebook and LinkedIn. The study reveals that workers use social media for entertainment purposes and to develop professional and social relationships, with 55% unable to live without social media at work for recreational activities. In addition, 35% spend on average 1 to 2 hours on social networks, mainly between 12 p.m. and 2 p.m. It also appears that 46% believe that social networks moderately improve their productivity. These findings can guide marketing strategies, training, technology development and government policies related to the use of social media in the workplace.

关键词： social Network social Media Applications Poisson’s Law statistics Digital supports Workers Productivity

Résume d'étude sur la géographie urbaine d'Ou-si

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

地理学报 1935年第3期 156-157页

作者： Par Wang Chung-chi Univetsité Centrale nationale

La situation d’Ou-si Le pays des canaux dans la plaine deltaique du Yang-tseuest la situation ou position général géogaphique d’Ou-si. Actuellement,Ou-si est une ville industrielle et commerciale dans l’arrière... 详细信息

关键词： La tude sur la g ographie urbaine d’Ou-si sume d

Decentralized observers for a class of large-scale singular systems via LMI

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2013年第2期6卷 158-181页

作者： Mejda Mansouri Latifa Boutat-Baddas Mohamed Darouach Hassani Messaoud Ecole nationale d’Ingenieurs de Monastir MonastirTunisie and Centre de Recherche en AutomatiqueNancy-UniversiteIUT de LongwyCosnes et RomainFrance Centre de Recherche en Automatique de Nancy Nancy-UniversiteCosnes et RomainFrance Ecole nationale d’Ingenieurs de Monastir MonastirTunisie

Purpose–The purpose of this paper is to propose a decentralized observer for large-scale singular ***/methodology/approach–In this paper,the authors investigate the problem of observers’design for large-scale singular *** proposed decentralized observer is based on a new parameterization of the generalized sylvester equation *** considered system is partitioned into small-sizes interconnected subsystems with unknown ***–A decentralized observer based on new parameterization of generalized sylvester *** performance of the proposed approach is illustrated by a numerical ***/value–The proposed approach unites the full-order,the reduced-order and the minimal order observer design for large-scale *** conditions of the existence of this observer are given in the linear matrix inequalities(LMI)form.

关键词： systems theory Design Control systems Large scale system Decentralized observer singular system Linear matrix inequalities

synthesis and evaluation of C-glycosides as hydrotropes and solubilizing agents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

science China Chemistry 2010年第9期53卷 1957-1962页

作者： RANOUX Adeline LEMIEGRE Loc BENVEGNU Thierry Ecole nationale supérieure de Chimie de Rennes CNRS UMR 6226Université Européenne de Bretagne

This work presents expeditious synthesis of C-glycoside amphiphiles in aqueous media from unprotected di-or mono-saccharides.A Horner-Wadsworth-Emmons/Michael addition/Barbier allylation sequence led to C-glycosides that exhibit hydrotropic *** hydrotropic and solubilizing properties of these homoallylic alcohols including a β-C-glycoside moiety as well as additional β-C-glycosidic ketones with a short(C7) alkyl chain are also described and compared with those of commercial O-glucoside references.

关键词： C-glycoside amphiphiles Horner-Wadsworth-Emmons reaction Barbier allylation green chemistry hydrotropes

The Polycomb Complex PRC1:Composition and Function in Plants

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2013年第5期40卷 231-238页

作者： Anne Molitor Wen-Hui shen Institut de Biologie Moléculaire des Plantes du CNRs Université de Strasbourg12 rue du Général Zimmer67084 StrasbourgFrance Institut J.-P.Bourgin UMR1318 INRA-AgroParisTechINRAroute de Saint Cyr78026 VersaillesFrance

Polycomb group（PcG） proteins are crucial epigenetic regulators conferring transcriptional memory to cell *** assemble into multi-protein complexes,e.g.,Polycomb Repressive Complex 1 and 2（PRC1,PRC2）,which are thought to act in a sequential manner to stably maintain gene ***2 induces histone H3 lysine 27（H3K27） trimethylation（H3K27me3）,which is subsequently read by PRCl that further catalyzes H2A monoubiquitination（H2Aub1）,creating a transcriptional silent chromatin ***2 components are conserved in plants and have been extensively characterized in *** contrast,PRCl composition and function are more diverged between animals and *** more recently,PRC1 existence in plants has been *** we review the aspects of plant specific and conserved PRC1 and highlight critical roles of PRC1 components in seed embryonic trait determinacy,shoot stem cell fate determinacy,and flower development in Arabidopsis.

关键词： Epigenetics Chromatin Histone modifications Polycomb PRC1 Arabidopsis development

Thermal effects on clay rocks for deep disposal of high-level radioactive waste

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 81-96页

作者： Chun-Liang Zhang Nathalie Conil Gilles Armand Gesellschaft für Anlagen- und Reaktorsicherheit (GRs) Braunschweig 38122 Germany Agence nationale pour la gestion des déchets radioactifs (Andra) Bure 55290 France

Thermal effects on the Callovo-Oxfordian and Opalinus clay rocks for hosting high-level radioactive waste were comprehensively investigated with laboratory and in situ experiments under repository relevant conditions:(1) stresses covering the range from the initial lithostatic state to redistributed levels after excavation,(2) hydraulic drained and undrained boundaries, and(3) heating from ambient temperature up to 90℃-120℃ and a subsequent cooling phase. The laboratory experiments were performed on normal-sized and large hollow cylindrical samples in various respects of thermal expansion and contraction, thermally-induced pore water pressure, temperature influences on deformation and strength, thermal impacts on swelling, fracture sealing and permeability. The laboratory results obtained from the samples are consistent with the in situ observations during heating experiments in the underground research laboratories at Bure and Mont-Terri. Even though the claystones showed significant responses to thermal loading, no negative effects on their favorable barrier properties were observed.

关键词： Clay rock Thermal effects Pore pressure Deformation strength Permeability sealing of fractures Repository

Biomass production and carbon balance in two hybrid poplar(Populus euramericana)plantations raised with and without agriculture in southern France

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2018年第6期29卷 1689-1701页

作者： Kaushalendra Kumar Jha UMR systems Institute Nationale de la Recherche Agronomique2 place Pierre Viala34060 MontpellierFrance Technical Forestry Indian Institute of Forest ManagementBhopalIndia

Poplar is useful in different climates for bioenergy production and carbon sequestration when planted as a single species or in agroforestry. Europe has large areas potentially suitable for poplar forestry and a bioenergy policy that would encourage poplar forestry. In this study I estimated biomass production and carbon sequestration in poplar monoculture plantation and poplar-wheat agroforestry, in the Mediterranean region of France. A single-tree harvesting method was used to estimate biomass and an empirical conversion factor was adopted to calculate sequestered carbon. Total biomass was higher in agroforestry trees(1223 kg tree) than in monoculture plantation trees(1102 kg tree).Aboveground and belowground biomass distributions were similar in both cases(89 and 88% aboveground, and 11 and12% belowground, respectively in agroforestry and monoculture). The partitioning of total biomass in an agroforestry tree in leaves, branch, and trunk(aboveground), and fine roots, medium roots, coarse roots and underground stem(belowground) was 1,22,and 77,and 6,9, 44 and 40%,respectively. Except for branch and trunk, all other compartments were similarly distributed in a monoculture *** of C was higher in agroforestry trees(612 kg tree)than in monoculture trees(512 kg tree). In contrast, C storage on a per hectare basis was lower in agroforestry(85 Mg ha) than in monoculture(105 Mg ha) due to the lower density of trees per hectare in agroforestry(139 trees in agroforestry vs 204 trees in monoculture). On a per hectare basis, soil C stocks pattern were similar to per tree stocking:They were higher in agroforestry at 330 Mg hathan in monoculture 304 Mg ha. Higher C accumulation by agroforestry has a direct management implication in the sense that expanding agroforestry into agriculture production areas with short rotation and fast growing trees like poplar would encourage quicker and greater C sequestration. This could simultaneously fulfil the requirement of bioenergy

关键词： Populus euramericana Wood volume and density Root:shoot ratio Vegetation and soil carbon system efficiency