检索结果-南通市图书馆

A Glassy Carbon Electrode Modified with Cellulose Nanofibrils from Ammophila arenaria for the Sensitive Detection of L-Trytophan

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 Sensor Technology 2024年第3期14卷 35-50页

作者： Sondes Bourigua Feriel Boussema Zayneb Jebali houcine Barhoumi Hatem Majdoub Abderrazak Maaref Nicole Jaffrezic-Renault Laboratory of Advanced Materials and Interfaces Faculty of Sciences University of Monastir Monastir Tunisia Institute of Analytical Sciences University of Lyon Villeurbanne France

L-tryptophan is an essential amino acid for human health. Nanofibrillated cellulose (NFC) from marram grass (Ammophila arenaria) extracted from plants harvested in the center of Tunisia was used for the first time for the modification of a glassy carbon electrode (GCE), for the sensitive detection of L-tryptophan (Trp). After spectroscopic and morphological characterization of the extracted NFC, the GC electrode modification was monitored through cyclic voltammetry. The NFC-modified electrode exhibited good analytical performance in detecting Trp with a wide linear range between 7.5 × 10−4 mM and 10−2 mM, a detection limit of 0.2 µM, and a high sensitivity of 140.0 µA∙mM−1. Additionally, the NFC/GCE showed a good reproducibility, good selectivity versus other amino acids, uric acid, ascorbic acid, and good applicability to the detection of Trp in urine samples.

关键词： Nanofibrillated Cellulose Chitosan Chemically Modified Glassy Carbon Electrode Electrochemical Detection L-Tryptophan

Assessment of the Moroccan Mediterranean Coasts Contamination by Hydrocarbons (Non Aromatic Hydrocarbons, Aromatic Hydrocarbons and Linear Alkylbenzenes)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2011年第4期2卷 562-572页

作者： Saida bouzid Soumaya Khannous Ioanna Bouloubassi Alain Saliot Hassan Er Raioui 不详

In order to evaluate the contamination of the Moroccan Mediterranean coasts by persistent organic pollutants we studied hydrocarbons and linear alkylbenzenes in bivalve tissues (cockles) collected seasonally from several points along the western Moroccan coasts in the Mediterranean Sea. Two fractions corresponding to non aromatic and aromatic hydrocarbons were analyzed by GC/FID and GC/MS. Non aromatic hydrocarbon concentrations vary in the range of 24.1 - 2731 μg/g dry weight (dw) while total n-alkanes vary from 2.2 to 68.2 μg/g. Few exceptions were noted with values up to 243 μg/g (dw), which is high compared to other Mediterranean sites. The presence of an important unresolved complex mixture (UCM) indicated a significant petroleum contamination, confirmed by the identification of 17α(H), 21β(H) hopanes. Biogenic contributions were also detected within the n-alkane distribution (n-C17, n-C18, n-C27, n-C29, n-C17, /Pr, n-C18, /Ph) and by the presence of alkenes. C13, and C14, linear alkylbenzenes were found at concentrations of 478 - 1954 ng/g. and point to pollutant inputs from wastewaters. Polycyclic aromatic hydrocarbons were present in low concentrations below the GC detection limit. The observed seasonal and spatial variations were linked to the magnitude of inputs from marine and land-based pollutant discharges.

关键词： Western Moroccan Mediterranean Coast Bivalves Contamination Gas Chromatography Hydrocarbons Biogeochemical Markers Petrogenic and Biogenic Origins

Fingerprint Identification by Artificial Neural Network

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 Physical Science and Application 2014年第6期4卷 381-384页

作者： Mustapha Boutahri Said El Yamani Samir Zeriouh Abdenabi bouzid Ahmed Roukhe Optronic and Information Treatment Team Atomic Mechanical Photonic and Energy Laboratory Faculty of Science Moulaylsmail University B.P. 11201 Zitoune Meknks Morocco

Biometric techniques require critical operations of digital processing for identification of individuals. In this context, this paper aims to develop a system for automatic processing of fingerprint identification by their minutiae using Artificial Neural Networks （ANN）, which reveals to be highly effective. The ANN method implemented is a based on Multi-Layer Perceptron （MLP） model, which utilizes the algorithm of retro-propagation of gradient during the learning process. In such a process, the mean square error generated represents the specific parameter for the identification phase by comparing a fingerprint taken from a crime scene with those of a reference database.

关键词： Fingerprint artificial neural network minutiae identification multi-layer perceptron back-propagation of the gradient.

Landslide Cartography at the Region of Nabeul-Hammamet Based on Geographic Information System and Geomatic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2016年第9期7卷 1088-1101页

作者： Romdhan Haddad Mariam Labiad Mohamed Khaled bouzid Rym Rabia Dallel Makloufi Mohamed Chedly Rabia UR11ES41 Geomatics and Geosystems University of Manouba Manouba Tunisia Faculty of Sciences Bizerte Zarzouna University of Carthage Carthage Tunisia

Landslides are one of the most significant natural damaging disasters in hilly environment [1]. The location of our study area is to the north of Tunisia, home to several manifestations of land instabilities, we bring to study this area of interest by GIS and geomatic approach to reduce social economic losses due to landslides. The performance of a cartographic data base for the landslide study in the Cap-Bon region was realized through studying geologic 1/50,000 and topographic 1/25,000 maps, aster optic Remote Sensing, land observation, and climatologic seismic data. These data will be digitalized, georeferenced, vectorized, spatially analyzed, classified and geotreated in order to produce a landslides card. The findings have shown that fields with smooth and friable lithology which are located at rather important seismic zones (more than 4 at Richter’s scale) have some stability. However, the most endangered zones are in the North-West around Oued El Kbir and El Ain. Realizing this work helps to determine the most hazardous zones so that policy makers have an effective field intervention.

关键词： Cartography GIS Geomatic Landslide Nabeul-Hammamet

摩洛哥中文系汉语教学状况——以哈桑二世大学中文系为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

摩洛哥中文系汉语教学状况——以哈桑二世大学中文系为例

作者：陈安忆（Zraidi El houcine）上海外国语大学

学位级别：硕士

穆罕默德六世国王于2016年5月访华,中摩两国签署战略伙伴关系,为两国的合作关系带来了前所未有的机遇,开启了全面发展的新时期。几个月以后,哈桑二世大学艾因谢高文学院的中文系诞生了。2021年,中文系已经有了第五届一年级学生,但因为... 详细信息

穆罕默德六世国王于2016年5月访华,中摩两国签署战略伙伴关系,为两国的合作关系带来了前所未有的机遇,开启了全面发展的新时期。几个月以后,哈桑二世大学艾因谢高文学院的中文系诞生了。2021年,中文系已经有了第五届一年级学生,但因为各种原因,中文系汉语教学的发展却没能达到预期。笔者本科毕业于哈桑二世大学艾因谢高文学院中文系,对中文系的汉语教学情况比较熟悉,十分了解中文系发展情况及其遇到的问题,一直主动为中文系的发展给中文系管理者提供帮助,作为一名学习了三年的中文系学生,笔者一直跟管理者保持联系。笔者通过针对中文系汉语教学进行的问卷调查和访谈,更深刻地了解到该中文系汉语教育的真实情况。笔者不仅从学生角度研究中文系情况,也因有幸在哈大中文系教学而从教师角度出发开展研究。笔者采访了中文系主管和30位中文系学生并设计针对中文系老师和中文系学生的问卷调查,从师生情况、课程与材料、教学环境和考试制度、安排活动及学生的将来发展或建议等方面设计调查问卷,并根据问卷数据和学院提供的数据进行分析,在此基础上提出笔者和主管对这些问题的观点,最后给出相应的建议。本文主要分为五个章节,对哈大中文系汉语教学进行调查分析,第一章为绪论,主要是对摩洛哥汉语教学发展和哈大中文系的初级发展进行总体概括描述;第二章描述哈大中文系汉语教学状况,包括师资、学生总数、课程安排、使用教材和课外活动;第三章呈现师生之间的教学问题,主要是老师和学生在教学方面的交流及教育问题、水平差异问题及辍学率问题;第四章讨论中文系教材、课程及活动安排问题,主要描述教材使用和课程安排的问题;第五章对中文系的一些教学问题提出建议并谈及学生的将来发展。第六章是本文的结论,总结了中文系汉语教学的初级发展、笔者所发现的教学问题,尤其是师生问题、辍学率、教材、课程安排、教学大纲、学习动机等问题,最后总结了中文系管理者、老师、学生、院校合作方院长及笔者的观点和建议。

关键词：哈桑二世大学汉语教学现状教学问题教学建议

Effect of the Heat Treatments on the Dopes Segregation in Polycrystalline Silicon Films

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Journal of Modern Physics 2012年第9期3卷 1046-1049页

作者： Salima Silini Baghdadi Chouial bouzid Hadjoudja Ouissem Benhalima Sana Yousfi Allaoua Chibani Laboratory of Semiconductors Department of Physics University Badji Mokhtar Annaba Algeria

In this work we are interested in studying the effect of the heat treatments on the dopant segregation at the grain boundaries in the polycrystalline silicon films. The obtained results have shown that the heat treatments reduce the number of segregation sites at the grains boundaries, and consequently they limit the structural changes that can appear there and the quantity of the dope atoms that can accumulate in these boundaries. In addition they are more and more dopant that are found inside the grains when the temperature of the heat treatment increases. On the other hand, we established that the arsenic atoms have a strong tendency to the segregation than the boron atoms, and we have noticed a strong migration of arsenic atoms from the boundaries towards the grains under the effect of the heat treatments. It was also shown that the segregation of arsenic atoms at the grains boundaries is about 4 times higher than that of the boron atoms.

关键词： Segregation Grains Boundaries Heat Treatments Polycrystalline Silicon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

玻璃的冲击损伤(英文)

宁波大学学报（理工版） 2003年第4期16卷 354-362页

作者： S.bouzid Z.AZARI Universite Ferhat Abbas SetifFaculte des Sciences de l’IngenieurAlgerieFaculte de Mathematique el d’InformatiqueUniversite de Plcardie80039 AmiensFrance

冲蚀过程是一个与颗粒反复冲击物体表面而移除物质相关的表面现象.本文研究了玻璃的冲蚀坑的几何尺寸和体积,给出了冲蚀移除物质如何依赖于颗粒流动速度、颗粒尺寸和冲击角的理论关系.通过理论与实验结果相比较,定义了一定冲蚀坑尺度的... 详细信息

冲蚀过程是一个与颗粒反复冲击物体表面而移除物质相关的表面现象.本文研究了玻璃的冲蚀坑的几何尺寸和体积,给出了冲蚀移除物质如何依赖于颗粒流动速度、颗粒尺寸和冲击角的理论关系.通过理论与实验结果相比较,定义了一定冲蚀坑尺度的有效域.

关键词：玻璃冲击损伤冲蚀过程冲蚀坑颗粒流动速度颗粒尺寸冲击角

优化遮盖力并降低钛白粉用量的先进遮盖聚合物与新型分散剂技术

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

电镀与涂饰 2013年第9期32卷 59-64页

作者：伍文君熊喜竹 Christine Fortener Medhi bouzid Mike Kaufman 刘丽莉阿科玛涂料常熟高泰助剂有限公司江苏常熟215522 高泰助剂

钛白粉短缺以及由此而引起的价格上涨再次激励涂料化学家为增加涂料遮盖力而寻找这一关键原材料的替代品。针对这一目标,阿科玛最近推出了两种新技术──CelocorTM遮盖聚合物和能提高钛白粉遮盖效率的新型分散剂。本文介绍了这两种新技... 详细信息

钛白粉短缺以及由此而引起的价格上涨再次激励涂料化学家为增加涂料遮盖力而寻找这一关键原材料的替代品。针对这一目标,阿科玛最近推出了两种新技术──CelocorTM遮盖聚合物和能提高钛白粉遮盖效率的新型分散剂。本文介绍了这两种新技术产品的性能,并通过其在4种乳胶漆中的应用实例说明如何有效利用这两种技术的组合来显著降低涂料配方中所需钛白粉的用量。

关键词：钛白粉替代品遮盖聚合物分散剂遮盖力着色强度

3-(Tetrazol-5-yl)-2-imino-coumarins Derivatives: Synthesis, Characterization, and Evaluation on Tumor Cell Lines

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

International Journal of Organic Chemistry 2021年第1期11卷 24-34页

作者： Ali Bouattour Mehdi Fakhfakh Souhir Abid El-Gharbi Majdi Abid Ludovic Paquin Rémy Le Guevel Thierry Charlier houcine Ammar Jean-Pierre Bazureau Laboratoire de Chimie Appliquée: Hétérocycles Corps Gras et Polymères Faculté des Sciences de Sfax Université de Sfax Sfax Tunisie Chemistry Department College of Science and Arts Jouf University Al Qurayyat Al Jawf KSA Institut des Sciences Chimiques de Rennes ISCR UMR CNRS 6226 Campus Beaulieu Université de Rennes 1 Bat. 10A Rennes Cedex France S2Wave Platform ScanMAT UMS 2001 CNRS Campus Beaulieu Université de Rennes 1 Bat. 10A Rennes Cedex France ImPACcell Platform SFR Biosit Bat. 8 Campus Villejean Rennes Cedex France

The first report of new 3-(tetrazol-5-yl)-2-iminocoumarin derivatives is described. The title compounds were prepared in two steps and were obtained in good yields (55-93%). They have been fully characterized by 1H, 13C NMR, FTIR, UV-Visible and HRMS. They were tested for their antiproliferative activities against six representative human tumor cell lines (Huh 7-D12, Caco2, MDA-MB231, HCT 116, PC3 and NCI-H727) and HaCat keratinocytes. Among them, compound 5e was active on HCT 116 (IC50 15 μM).

关键词： 2-Iminocoumarin Tetrazole Fluorescence Tumor Cell Lines HCT 116