تصفح Earth Science Cluster حسب تاريخ النشر
السجلات المعروضة 1 -- 20 من 216
-
Dolomite: Perspectives on a perplexing mineral
( research qate , 2009 , Article Review)Dolomite is a metastable mineral that can precipitate directly from solutions containing magnesium, calcium and carbonate to form cement or unlithified sediment. It can be categorized into two classes such as penecontemporaneous ... -
Microstructural investigation of gamma-irradiated ultra high molecular weight polyethylene in nitrogen atmosphere
( Trans Tech Publications , 2010 , Conference)In this paper the results of structural changes in ultra high molecular polyethylene (UHMWPE) upon gamma irradiation and storage in nitrogen environment are reported. Based on differential scanning calorimetry (DSC), wide ... -
Effect of gamma irradiation on the microstructure and morphology of polyethylene oxide and polyvinyl alcohol blends
( Trans Tech Publications , 2010 , Conference)Thin films of a blend of 90, 75, 50 (wt/wt%) percentage of polyethylene oxide and polyvinyl alcohol were synthesized and irradiated with 5, 25, 50, 100 and 200 kGy. The presence of PVA leads to diffusion controlled mechanism ... -
Lithology, mineral assemblages and microbial fingerprints of the evaporite-carbonate sediments of the coastal sabkha of Abu Dhabi and their extraterrestrial implications
( cambridge university press , 2010 , Article)Deep-core and surface samples collected from the coastal sabkha of Abu Dhabi were subjected to a multi-proxy study, including petrographic, geochemical and spectroscopic analyses. The sediments studied are composed of ... -
Raman spectroscopy of the Dukhan sabkha: identification of geological and biogeological molecules in an extreme environment
( The Royal Society , 2010 , Article)The characterization of minerals and biogeological deposits in a terrestrial Arabian sabkha has a direct relevance for the exploration of Mars since the discovery by the NASA rovers Spirit and Opportunity of evaporate ... -
Microbial dolomites from carbonate-evaporite sediments of the coastal sabkha of Abu Dhabi and their exploration implications
( wiley online library , 2010 , Article)Detailed petrographic studies of Recent dolomites from the coastal sabkha of Abu Dhabi using SEM and Energy Dispersive X-ray (EDX) analyses indicate that most of the dolomite started to form in " micro-niches" (i.e. small ... -
Mangrove-bearing limestone from the Eocene Dammam Formation, Arabian Gulf: Implications for the mangrove dispersal controversy
( springer link , 2012 , Article)Fossil mangrove remains are found within the shallow carbonate strata of the Middle Eocene Dammam Formation of the Arabian Gulf. This formation is of wide distribution across most eastern parts of the Arabian Platform and ... -
Screening Of Some Qatari Plant Extracts For Anti Fungal Activities Of Plant Pathogenic Fungi
( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference)The present study aimed to evaluate the antifungal activity of three desert plants extracts grown naturally in Qatar: (Al-rayhan) Ocimum basilicum, Shafallah (Capparis spinosa) and Qwaif(Prosopis juliflora)to study their ... -
Seismic detection of a sinkhole using spectral-based analysis
( Society of Exploration Geophysicists , 2014 , Conference)Seismic data recorded during a survey in the vicinity of a sinkhole revealed distinct resonances at 70 Hz. Frequency domain data inversion based on exact modeling produced effective elastic parameters for the location over ... -
Insights into molecular features of venerupis decussata oocytes: A microarray-based study
( Public Library of Science , 2014 , Article)The production of Venerupis decussata relies on wild seed collection, which has been recently compromised due to recruitment failure and severe mortalities. To address this issue and provide an alternative source of seed, ... -
Physico-chemical characteristics of oil produced from seeds of some date palm cultivars (Phoenix dactylifera L.) .
(2015 , Article)The oil content of saturated and unsaturated fatty acids with some physico-chemical properties and nutrients were investigated in oil produced from seeds of six important date palm cultivars and one seed strain present in ... -
Measurement and modelling of nitrogen dioxide (NO2) emissions: a marker for traffic-related air pollution in Doha, Qatar
( Taylor & Francis , 2015 , Article)In the State of Qatar, recent statistics show a continued increase in the motor-vehicle fleet commensurate with population growth and economic development. This trend, together with the rapid expansion of urban areas and ... -
The importance of microbial mats for dolomite formation in the Dohat Faishakh sabkha, Qatar
( Springer Verlag , 2015 , Article)The Dohat Faishakh sabkha in Qatar is one of the rare modern environments where it is possible to study the formation of dolomite, a mineral whose origin has been long debated. In previous studies, dolomite formation in ... -
Two-stage cultivation of a Nannochloropsis mutant for biodiesel feedstock
( Springer Verlag , 2015 , Article)Optimization of mass microalgae cultures is required for the efficient production of biodiesel feedstock in terms of total fatty acid (TFA) content and a conducive fatty acid profile. A mutant strain of Nannochloropsis sp. ... -
Chemical Characterization and Source Identification of Beached Oil from Two Areas Along the North-Western Coast of Qatar
( Hamad bin Khalifa University Press (HBKU Press) , 2016 , Conference)Over the years there have been several reports of oil spills affecting particularly the northern coast of Qatar. In most cases, the source of oil spills is not identified. The spilled oils are very resistant to degradation ... -
Investigating chlorophyll and nitrogen levels of mangroves at Al-Khor, Qatar: an integrated chemical analysis and remote sensing approach. Environmental Monitoring and Assessment
( Springer Verlag , 2016 , Article)Mangroves are unique ecosystems that dominate tropical and subtropical coastlines around the world. They provide shelter and nursery to wide variety of species such as fish and birds. Around 73 species of mangroves were ... -
Stratigraphy and petroleum systems of the Paleozoic (pre-Khuff) succession, Qatar
( Wiley , 2016 , Article)A thickness of more than 1500m of Palaeozoic (pre-Khuff) siliciclastic strata were encountered in three deep wells (Matbakh A, and Dukhan A and B) drilled in the State of Qatar. These sedimentary rocks have no formal ... -
Qatar’s vision of global problems, challenges and solutions
( QScience - Hamad Bin Khalifa University Press , 2016 , Conference)Since Qatar first signed the Biodiversity Convention in Rio in 1992, Qatar has been a strong advocate with keen interest in sustainability and the preservation of its biodiversity noting that advancement in industry should ... -
Microplastics in coastal environments of the Arabian Gulf
( Elsevier Ltd , 2017 , Article)Eight sandy beaches along the coastline of Qatar and four sea surface stations on the eastern coast, adjacent to Doha Bay, were surveyed between December 2014 and March 2015. Microplastics, mainly low density polyethylene ... -
Evaluation of Satellite Retrievals of Chlorophyll-a in the Arabian Gulf
( MDPI , 2017 , Article)The Arabian Gulf is a highly turbid, shallow sedimentary basin whose coastal areas have been classified as optically complex Case II waters (where ocean colour sensors have been proved to be unreliable). Yet, there is no ...
