检索结果-南通市图书馆

Geochemistry, mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu–Fe deposit: potential occurrence of native gold and precious metal traces (North African orogenic belt, Northern Tunisia)

引用

Acta Geochimica 2024年第2期43卷 366-384页

作者： Rania ben aissa Wiem ben aissa Said Tlig Lassaad ben aissa Abdessalem ben Haj Amara Faculty of Science of Bizerte University of Carthage7021 ZarzounaBizerteTunisia Laboratoire de Recherche Ressources Materiaux et EcosystemesUniversity of Carthage7021 ZarzounaBizerteTunisia Department of Geology University Claude Bernard Lyon 169622 VilleurbanneFrance Faculty of Science of Tunis University of Tunis-El ManarRommana1068 TunisTunisia

The Ain El Bey abandoned mine, in North-West Tunisia, fits into the geodynamic context of the European and African plate boundary. Ore deposit corresponds to veins and breccia of multiphase Cu–Fe-rich mineralization related to various hydrothermal fluid circulations. Petromineralogical studies indicate a rich mineral paragenesis with a minimum of seven mineralization phases and, at least, six pyrite generations. As is also the case for galena and native silver, native gold is observed for the first time as inclusion in quartz which opens up, thus, new perspectives for prospecting and evaluating the potential for noble metals associated with the mineralization. Scanning Electron Microscope--Energy Dispersive Spectroscopy and Transmission electron microscopy analyses show, in addition, a large incorporation of trace elements, including Ag and Au, in mineral structures such as fahlores(tetrahedrite-tennantite) and chalcopyrite ones. The mineral/mineral associations, used as geothermometers, gave estimated temperatures for the mineralizing fluids varying from 254 to 330 ℃ for phase Ⅲ, from 254 to 350 ℃ for phase Ⅳ, and from 200 to 300 ℃ for phases Ⅴ and Ⅵ. The seventh and last identified mineralization phase, marked by a deposit of native gold, reflects a drop in the mineralizing fluid’s temperature(< 200 ℃) compatible with boiling conditions. Such results open up perspectives for the development of precious metal research and the revaluation of the Cu–Fe ore deposit at the Ain El Bey abandoned mine, as well as at the surrounding areas fitting in the geodynamic framework of the Africa-Europe plate boundary.

关键词： Ore-formingﬂuids Mineral geochemistry Mineral geothermometers Native silver-gold Ain El Bey Ore deposit North Tunisia

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

Hydrological seasonality of cape Ghir filament in morocco

引用

Natural Science 2012年第1期4卷 5-13页

作者： Ahmed Makaoui A. Orbi Javier Arestigui aissa ben azzouz Jamila Laarissi Aziz Agouzouk Karim Hilmi 不详

The filament of cape Ghir is characterized by a spatial and temporal variability relating to circulation of the water masses of the zone and current velocity of canaries current. The activity of resurgences of cape Ghir appears from April, intensifies during August and June and still persists in October during 2009. During the season of summer and autumn, the filamentous structure is marked by the presence of an activity of important resurgences. In August, the filament is restricted on one branch and appears in limited area of cape Ghir. In autumn, the filament structure fellow several branches toward different directions between cape Ghir and cape Sim.

关键词： Filament Upwelling hydrology Remote Sensing

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

Cysteine proteases as therapeutic targets:does selectivity matter? A systematic review of calpain and cathepsin inhibitors

引用

Acta Pharmaceutica Sinica B 2015年第6期5卷 506-519页

作者： Marton Siklos Manel ben aissa Gregory R.J.Thatcher Department of Medicinal Chemistry and Pharmacognosy University of Illinois College of Pharmacy

Cysteine proteases continue to provide validated targets for treatment of human *** neurodegenerative disorders,multiple cysteine proteases provide targets for enzyme inhibitors,notably caspases,calpains,and *** reactive,active-site cysteine provides specificity for many inhibitor designs over other families of proteases,such as aspartate and serine;however,a)inhibitor strategies often use covalent enzyme modification,and b)obtaining selectivity within families of cysteine proteases and their isozymes is *** review provides a general update on strategies for cysteine protease inhibitor design and a focus on cathepsin B and calpain 1 as drug targets for neurodegenerative disorders;the latter focus providing an interesting query for the contemporary assumptions that irreversible,covalent protein modification and low selectivity are anathema to therapeutic safety and efficacy.

关键词： Cysteine protease Calpain Cathepsin Enzyme inhibitors Neurodegeneration Alzheimer’s disease

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

Optical response and SERS properties of individual large scale supracrystals made of small silver nanocrystals

引用

Nano Research 2015年第5期8卷 1615-1626页

作者： Pierre Aubertin Mohamed Ali ben aissa Noureddine Raouafi Suzanne Joiret Alexa Courty Emmanuel Maisonhaute Sorbonne Universites UPMC Univ Paris 06 UMR 8235 Laboratoire Interfaces et Systemes Electrochimiques F-75005 Paris France CNRS UMR 8235 LISE F-75005 Paris France Sorbonne Universites UPMC Univ Paris 06 UMR 8233 Laboratoire MONARIS F-75005 Paris France CNRS UMR 8233 Laboratoire MONARIS F-75005 Paris France Laboratoire de Chimie Analytique et Electrochimie Departement de Chimie Faculte des Sciences de Tunis Universite de Tunis El Manar Campus universitaire de Tunis EI-Manar 2092 Tunis El Manar Tunisie

There is a considerable interest in producing and understanding the optical and spectroscopic properties of ordered nanoparticle assemblies. Herein, we describe and interpret the optical absorbance and Raman properties of 5.9 nm ± 0.3 nm diameter silver nanocrystals coated with dodecanethiol and organized in highly ordered 3D superlattices of different heights. Each superlattice was studied individually, which allowed to elaborate a model based on Maxwell-Garnett theory to reproduce qualitatively the height and wavelength dependence of the absorbance. Importantly, because of their small size compared to that of traditional nanoparticles used in Surface Enhanced Raman Spectroscopy （SERS）, the large 3D distribution of hot spots generated by the silver superlattices allowed to easily obtain SERS spectra of the surrounding ligands despite their intrinsic low Raman cross section. Accordingly, traces of thiophenol could be detected very easily.

关键词： nanoparticles nanocrystals superlatfices supracrystals surface enhanced Raman spectroscopy (SERS) plasmonic properties organization

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

Managing Salinity in Tunisian Oases

引用

Journal of Life Sciences 2014年第9期8卷 775-782页

作者： Mohamed Hachicha Imed ben aissa Laboratory of Valorization of non Conventional Water National Institute of Rural Engineering Waters and Forest Ariana 2080 17 Rue Hedi Karray Tunisia Regional Research Centre of Horticulture and Biological Agriculture Chott Meriem BP 57-4042 Sousse Tunisia

The Tunisian oases face serious problems of waterlogging and salinization caused by mismanagement of water and soil resources and the reduced discharge of drainage water. The oases space is based on a fragile balance between water, soil and man, which is now changed by modem irrigation and drainage systems. The oases pump most of their water from deep aquifers and only to a small degree from shallow aquifers. The quality of the irrigation water and the presence of a shallow saline water table are the main causes of salinization of the oases. Concerning the salt-affected landscapes and hydro-saline dynamic, the authors distinguish an equilibrium dynamic of salts to the parcel which depends on water management, and an equilibrium dynamic at the level of the basin watershed which is powered by drilling and ending in hypersaline depressions. For the management of salinization and waterlogging, a combination of agricultural management techniques are used, the first being modem methods of irrigation and drainage. Other, less used methods are sandy amendment, the reuse of drainage waters, geothermal waters and of treated wastewater.

关键词： Water irrigation drainage salinity oases Tunisia.

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

Monitoring the variation of soil quality with sewage sludge application rates in absence of rhizosphere effect

引用

International Soil and Water Conservation Research 2020年第3期8卷 245-252页

作者： Rahma Inès Zoghlami Helmi Hamdi Sonia Mokni-Tlili Sarra Hechmi Mohamed Naceur Khelil Nadhira ben aissa Mohamed Moussa Habib Bousnina Saoussen benzarti Naceur Jedidi Arid Regions Institute University of GabèsMèdenine4119Tunisia Water Research and Technology Center University of CarthageP.O.Box 273Soliman8020Tunisia Center for Sustainable Development College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar National Institute for Research in Rural Engineering Water and ForestryP.O.Box 10Ariana2080Tunisia National Institute of Agronomy 43 Av.Charles NicolleTunis1082Tunisia College of Agriculture at Mograne University of Carthage1121MograneTunisia

Agricultural soils in semi-arid regions have frequently been degraded due to adverse climatic conditions,organic matter depletion,and poor farming *** enhance soil quality,this study examines the reuse of sewage sludge(SS)as an available source of organic matter in a typical Mediterranean sandy-loam ***,we studied the cumulative effect of two annual applications of 40,80 and 120 tons of sludge per ha on soil quality in absence of *** dose-dependent improvement of organic matter content was the most significant event that reflected sludge application rates,and consequently influenced other soil ***,soil structural stability increased by 13.3%,28.8%and 59.4%for treatments SS-40,SS-80 and SS-120 respectively as compared to unamended *** stability improvement was also confirmed by the dose-dependent variation of other edaphic factors including calcium content,the microbial quotient as well as Welt and C:N *** param-eters are involved in cementing soil aggregates by cation bridging,the formation of microbial mucilage,and clay-humic *** magnetic susceptibility(SMS)was measured in situ as a possible rapid tool to evaluate soil *** showed significant correlation with sludge dose and stability amelioration testifying to the aggregation role that can play Al2O3 and particularly Fe2O3 minerals added by the hematite-rich ***,analytical results and field observations revealed no trends of soil salinization or acidification by excessive sludge *** avoiding the rhizosphere effect,outcomes could reflect the resilience and intrinsic capacity of the soil to cope with excessive sludge loads.

关键词： Sandy loam soil Urban sewage sludge Structural stability Soil degradation Aggregation Magnetic susceptibility

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

Hydrogen recovery from big-scale porous metal hydride(MH)reactor:impact of pressure and MH-thermophysical properties

引用

Energy Storage and Saving 2022年第4期1卷 259-271页

作者： Atef Chibani Slimane Merouani aissa Dehane Cherif Bougriou Laboratory of Environmental Process Engineering Department of Chemical EngineeringUniversity Salah Boubanider Constantine 3ConstantineP.O.Box 72Algeria Department of Mechanical Engineering University of Mostefa Ben BoulaidBatna 2Batna05000Algeria Department of Process Engineering Faculty of Sciences and Applied SciencesLarbi Ben M’hidi University04000Oum El BouaghiAlgeria

An advanced ANSYS FLUENT-based model was developed for hydrogen recovery from a multi-tubular fixed-bed metal hydride(MH)reactor of large-scale *** model was firstly validated by comparing its results to specific experimental *** and heat transfer processes inside the fixed bed were investigated for various pressures and thermochemical characteristics of the MH(thermal conductivity,porosity and reaction parameters).The findings were reported as average,local and spatial changes in the metal’s bed temperature and hydrogen *** the initial stage of the endothermic desorption(t<100 s),the bed temperature dropped dramat-ically in all *** this time,there was a massive emission of *** bed temperature was then raised due to the reactor’s external convective heating,while the hydrogen release continued until the MH was completely *** dehydrogenation rate of the MH was enhanced when the discharge pressure was ***,some other characteristics of the MH,i.e.,porosity,thermal conductivity,desorption rate constant and activation energy,significantly impacted the resulting mass and heat fluxes inside the bed material.

关键词： Hydrogen storage Metal hydride(MH) Desorption Heat and mass transfer Mathematical model

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

Melting/solidification of phase change material in a multi-tube heat exchanger in the presence of metal foam:effect of the geometrical configuration of tubes

引用

Energy Storage and Saving 2022年第4期1卷 241-258页

作者： Atef Chibani aissa Dehane Slimane Merouani Cherif Bougriou Djemaa Guerraiche Laboratory of Environmental Process Engineering Department of Chemical EngineeringFaculty of Process EngineeringUniversity Salah Boubnider Constantine 3Constantine25000Algeria Department of Mechanical Engineering Faculty of TechnologyUniversity of Mostefa Ben BoulaidBatna 2Batna05000Algeria Faculty of Sciences and Applied Sciences Department of Process EngineeringLarbi Ben M’hidi UniversityOum El Bouaghi04000Algeria Applied Energy Physics Laboratory(LPEA) Physical DepartmentFaculty of Matter SciencesUniversity of Batna 1Batna05000Algeria

One of the likely methods for enhancing heat transfer in a latent thermal energy storage system is the conception of a thermal *** this study,the orientation of oval tubes(horizontal,vertical,and oblique)in phase change material(PCM,C_(19)-C_(20))-based shell-tube heat exchanger was analyzed with respect to the metal foam(MF)type(graphite,copper,and nickel)in comparison to the case of pure *** this purpose,a two-dimensional mathematical model was developed to investigate the thermal efficiency of the PCM-metal foam based composite energy storage *** was concluded that the orientation of the oval tubes(oblique,horizontal,and vertical)has a negligible impact on the performance of the thermal unit during the melting/solidification *** on the liquid/solid fraction,total enthalpy and the average temperature in the annular space,the performance of a heat exchanger during fusion/solidification periods is in the order:copper-MF>graphite-MF>nickel-MF>pure *** the adopted MF or the geometry of tubes,the melting process is expedited compared to the solidification mechanism.

关键词： Phase change material(PCM) Solidification process Melting process PCM-metal foam Heat exchanger

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

中国文化符号在突尼斯传播状况的调查与分析

中国文化符号在突尼斯传播状况的调查与分析

引用

作者：何爱伦(ben aissa Hanen) 扬州大学

学位级别：硕士

改革开放三十多年来,中国的国际影响力迅速提升,突尼斯普通老百姓对中国的了解也越来越多。有许多中国文化符号也让他们印象深刻。但是这些符号是零散的,没有规律的,不可以很好的来诠释中国文化,也不可以很好的利用起来为教学服务。所... 详细信息

改革开放三十多年来,中国的国际影响力迅速提升,突尼斯普通老百姓对中国的了解也越来越多。有许多中国文化符号也让他们印象深刻。但是这些符号是零散的,没有规律的,不可以很好的来诠释中国文化,也不可以很好的利用起来为教学服务。所以希望通过我的研究,可以帮助突尼斯学生更加了解中国文化,使中国和突尼斯两国人民之间的交流更加融洽。在学习中文的同时大部分外国学习者都很想了解中国文化,因为中国是拥有五千年历史文化的文明古国之一,所以他们对这个拥有悠久文化的国度产生很多好奇。但在学习中国文化的时候会发现,由于各个国家之间的文化差异很大,学习者都会遇到一些困难或者误解。比如西方人不能理解中国人讲的“面子”这个词或者不能接受一些中国人吃的食物等等,他们觉得这些都很奇怪,所以在教他们的时候会发现学习者不太能够接受。本文我选择学习中文的突尼斯学生做研究对象。因为两个国家在距离、语言、历史、宗教或者文化方面差异都非常大,所以突尼斯学生在学习中国文化时会遇到很多困难与误解。这个误解的原因很多,除了文化差异外还有教学内容、教材和教学法等等。我采用调查法发放调查问卷,加之整理、比较分析出其原因,给出一些适当的建议,希望能够让突尼斯民众对中国文化有越来越丰富的了解,给我们汉语教学的研究提供可行性的前提和参考。本文分为五个部分,包括四章正文部分,结语一个部分。各部分的主要内容如下：第一章,主要阐述了文化符号的特点,文化符号的概念及选取原则,以及中国文化符号的组成。第二章,采用调查法和访谈法,设计出调查问卷,针对非汉语学习者,突尼斯汉语学习者和来过中国的汉语学习者三类不同的调查对象,做好调查与分析。第三章,利用比较分析法,整理出调查问卷数据,对突尼斯民众中国文化符号认同分析,分别做了大众认同度较高的文化符号分析,汉语学习者与非汉语学习者认同度差距较大的文化符号,来过中国汉语学习者与未来过中国的汉语学习者认同度对比分析。第四章,根据调查数据的分析,对突尼斯的中国文化传播与文化教学提供建议。结语部分,对文章的主要观点和研究的不足之处进行了总结。

关键词：文化符号突尼斯文化调查

来源：

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

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

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

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：