检索结果-南通市图书馆

Process conditions for preparing well-defined nano- and microparticles as delivery systems of alkyl gallates

Particuology 2019年第3期17卷 105-116页

作者： Asma Chebil Denis Funfschilling Jean-Luc Six Cécile Nouvel alain durand Michèle Léonard Universite de Lorraine CNRS LCPM F-54000 Nancy France Universite de Lorraine CNRS LRGP F-54000 Nancy France Universite de Strasbourg CNRS ICube F-67000 Strasbourg France

Dextran-covered poly(D,L-lactide) (PLA) nano-and microparticles were prepared using an emulsion/solvent evaporation (or diffusion) process for the encapsulation of alkyl gallates (AGs).In the first step,a solution of PLA and AG in ethyl acetate was emulsified to give an aqueous phase containing a hydrophobically modified dextran,which acted as a *** second step involved solvent evaporation or *** emulsification conditions were varied,which allowed for the preparation of nanoand microparticle suspensions covering a wide range of surface-average particle diameters from 0.1 μm (sonication) to 500 μm (stirring with a magnetic bar),with narrow and reproducible size *** microfluidic emulsification in a flow-focusing system led to well-defined microparticles,in the 10-50 μm *** loaded with octyl gallate (OG) and nonyl gallate (NG) were obtained using the three processes,and we showed that the encapsulation efficiency of OG and NG varied significantly depending on the emulsification *** effect of particle size on the mechanism of in vitro release of encapsulated AGs was *** kinetics of release were controlled either by Fickian diffusion within the solid core or swelling and hydrolytic degradation of the PLA matrix,depending on the pH of the external medium.

关键词： Emulsion/solvent evaporation Dextran Poly(D.L-lactide) Encapsulation Release Alkyl gallate

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

Retrospect and prospect: 30 years of Formula conferences!

引用

Particuology 2019年第3期17卷 3-6页

作者： alain durand Jordi Esquena Ning Yang Guanghui Ma Ying Ren Frank Kleine Jager Bernd Sachweh Universite de Lorraine CNRS LCPM F-54000 Nancy France Institute of Advanced Chemistry of Catalonia CSIC 08034 Barcelona Spain Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China BASF SE 67056 Ludwigshafen Germany BASF Advanced Chemicals Co. Ltd. No 300 Shanghai 20013乙 China

The history of Formula conferences was summarized with a particular focus on Formula I and Formula Ⅸ (the first and last conferences of the series).The foundation of formulation during the middle of the 1980s by people from academia and industry in the fields of chemistry and chemical engineering was briefly *** current trends in formulation as well as in product engineering were listed.

关键词： Formulation Engineering Product Formula conferences

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

Paleohydrological Reconstruction from Late Holocene Records in Interdune Lakes(N’Guigmi,Northern Bank of the Lake Chad,Niger)

引用

Open Journal of Geology 2013年第2期3卷 143-155页

作者： David Sebag alain durand Zibo Garba Eric P.Verrecchia Laboratoire Morphodynamique Continentale et Cotiere Universite de RouenCentre National de la Recherche Scientifique(CNRS)RouenFrance Laboratoire HydroSciences Montpellier Institut de Recherche pour le Developpement(IRD)Universite de NgaoundereCamerounFrance Departement de Geologie Universite Abdou MoumouniNiameyNiger Institut des Sciences de la Terre Universite de LausanneLausanneSwitzerland

An old erg covers the northern part of the Lake Chad basin. This dune landform allowed the formation of many interdune ponds of various sizes. Still present in certain zones where the groundwater level is high (e.g. Kanem, southern Manga), these ponds formed in the past a vast network of lacustrine microsystems, as shown by the nature and the distribution of their deposits. In the Manga, these interdune deposits represent the main sedimentary records of the Holocene environmental succession. Their paleobiological (pollens, diatoms, ostracods) and geochemical (δ18O, δ13C, Sr/Ca) contents are often the basis for paleoenvironmental reconstruction. On the other hand, their sedimentological characters are rarely exploited. This study of palustro-lacustrine deposits of the Holocene N’Guigmi lake (northern bank of the Lake Chad;Niger) is based on the relationships between the sedimentological features and the climato-hydrological fluctuations. The mineralogical parameters (e.g. calcium carbonate content, clay mineralogy) and the nature of autochthonous mineralization (i.e. amorphous silica, clays, calcium carbonates) can be interpreted using a straightforward hydro-sedimentary model. Established to explain the geochemical dynamics of Lake Chad, this model is based on a biogeochemical cycle of the main elements (i.e. silicium, calcium) directly controlled by the local hydrological balance (i.e. rainfall/evaporation ratio). All these results show that a detailed study of sedimentological features can provide important paleohydrological informations about the regional aridification since ca 6500 14C BP.

关键词： Sahel Lake Chad Holocene Mineralogy Depositional Environments Climate Change

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 characterization of the removal efficiency and energy effectiveness of central air cleaners

引用

能源与人工环境(英文) 2021年第1期2卷 1-12页

作者： Patrice Blondeau Marc Olivier Abadie Alexandra durand Pascal Kaluzny Sylvie Parat alain Ginestet Dominique Pugnet Céline Tourreilles Thierry Duforestel LaSIE/La Rochelle University UMR CNRS 7356Avenue Michel Crépeau17042 La Rochelle cedex 1France Tera Environnement 628 rue Charles de Gaulle38920 CrollesFrance Air&Bio 13 rue Jules Ferry73000 ChambéryFrance CETIAT 25 avenue des artsBP 5204269603 VilleurbanneFrance EDF R&D Avenue des Renardières77818 Moret-sur-Loing cedexFrance.

This study assessed six commercially available in-duct air cleaning devices which are designed to be mounted in the central ventilation system of offices or commercial *** selected devices use different air cleaning technologies:mechanical filtration,electrostatic precipitation,gas filtration,ionization/cold plasma,photocatalytic oxidation(PCO)and catalysis under UV *** were tested against particles,a mixture of volatile organic compounds containing acetone,acetaldehyde,toluene,heptane and formaldehyde,and two bio-contaminants:Aspergillus brasiliensis(fungus)and Staphylococcus epidermidis(bacteria).Two different test rigs were *** single pass efficiency of each device was determined for three airflow rates,corresponding to face velocities ranging from 0.9 to 2.7 m/s,and two sets of temperature and humidity that are representative of indoor air conditions in wintertime and *** concentration of the chal-lenge volatile organic compounds was also varied in the 30 to 100μg/m^(3)range as a way to characterize their influence on efficiency at realistic concentration levels for non-industrial *** of ozone and formaldehyde concentration downstream of the air cleaners were carried out to determine the emission rate of by-products into the air ***,the energy issue was addressed by measuring the electric power drawn and pressure loss of the *** results showed that two devices,namely a radiant catalytic ionizer and a plasma ionizer,had a very low single pass efficiency against all the challenge *** association of the plasma ionizer and the electrostatic precipitator did not produce a synergetic effect between the two technologies either,contrary to what their manufacturer ***,three of the six devices tested were effective in terms of pollutant removal,but only two had an acceptable energy effectiveness in view of their use in low or zero energy *** energy effectiveness ranged

关键词： Central air cleaners Efficiency Clean air delivery rate Energy effectiveness By-products Ozone

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

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

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：