Institute of Graduate Studies and Research

Alexandria, Egypt

Institute of Graduate Studies and Research

Alexandria, Egypt
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Abdelwahab O.,National Institute of Oceanography and Fisheries of Egypt | Nasr S.M.,Institute of Graduate Studies and Research | Thabet W.M.,National Institute of Oceanography and Fisheries of Egypt
Alexandria Engineering Journal | Year: 2016

The cleanup of oil spill using natural adsorbents is considered as an eco-friendly and cost-effective way, emphasizing the importance of such natural and effective promising technique. Palm fibers, PFs, were used as natural sorbent material for oil spill removal. The present study examines the sorption efficiency and capacity of raw and modified fibers for three types of oil: diesel oil, crude oil and vegetable oil. The results revealed that the efficiency of fibers to remove different types of oil from artificial saline water was related to sorption time and the system conditions such as oil film thickness, particle size, sorbent dosage and temperature. The results showed high sorption efficiency and capacity of palm fibers for different kinds of oil. PFs were very proved to be promising fibers because of all advantages of agricultural wastes plus the high resistance of that fibers which appeared obviously in the present study. © 2017 Faculty of Engineering, Alexandria University.

Abd-El-Khalek D.E.,National Institute of Oceanography and Fisheries of Egypt | Abd-El-Nabey B.A.,Alexandria University | Abdel-kawi M.A.,Institute of Graduate Studies and Research | Ramadan S.R.,Institute of Graduate Studies and Research
Desalination and Water Treatment | Year: 2014

The antiscale properties of palm leaves extract (Phoenix dactylifer L) were studied using electrochemical impedance spectroscopy (EIS) and chronoamperometry techniques, in addition to microscopic examination. Calcium carbonate scales were deposited from the brine solution by cathodic polarization of the steel surface at −0.9 V (vs. SCE). Chronoamperometry curves and EIS measurements displayed that palm leaves extract increased the time of CaCO3 nuclei formation and consequently, retarded the growth step. The optical micrographs of the steel electrode clarified that the surface area occupied by the scale particles decreased with increasing plant extract concentrations. The results showed that palm leaves extract could be considered as efficient inhibitor for CaCO3 precipitation. © 2014 Balaban Desalination Publications. All rights reserved.

Morsy A.,Institute of Graduate Studies and Research | Morsy A.,Egyptian Petrochemicals Company | Ebrahim S.,Institute of Graduate Studies and Research | Kenawy E.-R.,Tanta University | And 2 more authors.
Water Science and Technology: Water Supply | Year: 2016

Reverse osmosis (RO) membranes based on cellulose acetate (CA), were prepared using a phase inversion technique. To improve the hydrophilicity, salt rejection and water flux of these membranes, a novel grafting of 2-acrylamido-2-methylpropanesulfonic acid (AMPSA) was added on the top surface of the CA-RO membranes. The grafted CA-RO membranes were characterized by Fourier transform infrared spectroscopy (FTIR), contact angle, and scanning electron microscopy techniques. It was found that the contact angles were 58W and 45W for pristine CA and 15 wt% grafted CA-RO membranes, respectively, which suggest an increase in the membrane surface hydrophilicity after grafting. The morphological studies of the surface of the pristine CA-RO membrane revealed a typical ridgeand-valley morphology and displayed a relatively high surface roughness of 337 nm, and a significant decrease at 15 wt% of grafted CA-RO membrane to 7 nm. The effect of the grafting percentages of AMPSA on the water flux and salt rejection was studied using a cross flow RO unit. The salt rejection and water flux of the grafted CA-RO membrane with 15 wt% were 99.03% and 6 L/m2h, respectively. © 2016 IWA Publishing.

Mohamed E.K.,Alexandria National Refining | Hassouna S.E.-D.,Institute of Graduate Studies and Research
Society of Petroleum Engineers - SPE Kuwait Oil and Gas Show and Conference | Year: 2015

Reduction of green house gases (GHGs) emissions from the combustion of fossil fuels, such as coal, petroleum products and natural gas is a big Challenge. Especially, CO2 due to its role in global climate change. Industrial boilers are considered to be one of the largest stationary sources of CO2 emissions in oil and gas (O&G) industries(J.C.M. al., 2012). These emissions from boiler's stack represent the highest ratio of the boiler losses because of the heat carried out by hot combustion products (nitrogen, carbon dioxide, sulfur oxide and excess oxygen). The high amount of energy wasted by dry flue gases depends on the amount of water vapor loss. The amount of wasted energy depends on final boiler exhaust temperature and mainly the hydrogen content of the fuel which ranges from 4 to 11%, depending on the type of fuel.One potential way to reduce this emission is to capture, transport and store CO2 either in geologic or oceanic formations. In addition, storage of CO2 in geologic formations could lead to new environmental issues such as threat of CO2 leakage, or potential contamination of ground water(Dennis al., 2014). Biomitigation is an ideal and sustainable alternative solution for CO2 capture and recycle (CCR) by using microalgae. Using algae, as a source of biofuels offers many advantages over traditional biofuel crops including the potential to be grown on the marginal land, use of water sources which is not suitable for agriculture because algae can tolerate high salt content. Meanwhile, they sustain high growth rates, and relatively high lipid content. In fact, using captured CO2 to grow microalgae is limited by the high cost of CO2 capture technologies and utilization(Liam al.,2010). Moreover, algae grow poorly at night, as CO2 cannot be temporarily stored until sunrise. Therefore, the condensation of CO2 from flue gasses in the form of bicarbonate (HCO-3) solution would provide a superior alternative for CO2 delivery as feedstock for algae culture system (Van Den Hende et al., 2012.)Furthermore, it reduces CO2 emissions significantly up to 80%, and reduces the use of fossil fuels by improving the efficiency of boilers. In addition, transport and storage of the aqueous bicarbonate solution costs less than for that of compressed CO2. © Copyright 2015, Society of Petroleum Engineers.

Hafiz D.A.,Virtual City | Sheta W.M.,Virtual City | Bayoumi S.,Institute of Graduate Studies and Research | Youssef B.A.B.,Virtual City
Journal of Computer Science | Year: 2011

Problem statement: Segmentation of 3D range images is widely used in computer vision as an essential pre-processing step before the methods of high-level vision can be applied. Segmentation aims to study and recognize the features of range image such as 3D edges, connected surfaces and smooth regions. Approach: This study presents new improvements in segmentation of terrestrial 3D range images based on edge detection technique. The main idea is to apply a gradient edge detector in three different directions of the 3D range images. This 3D gradient detector is a generalization of the classical sobel operator used with 2D images, which is based on the differences of normal vectors or geometric locations in the coordinate directions. The proposed algorithm uses a 3D-grid structure method to handle large amount of unordered sets of points and determine neighborhood points. It segments the 3D range images directly using gradient edge detectors without any further computations like mesh generation. Our algorithm focuses on extracting important linear structures such as doors, stairs and windows from terrestrial 3D range images these structures are common in indoors and outdoors in many environments. Results: Experimental results showed that the proposed algorithm provides a new approach of 3D range image segmentation with the characteristics of low computational complexity and less sensitivity to noise. The algorithm is validated using seven artificially generated datasets and two real world datasets. Conclusion/Recommendations: Experimental results showed that different segmentation accuracy is achieved by using higher Grid resolution and adaptive threshold. © 2011 Science Publications.

Ghatass Z.F.,Institute of Graduate Studies and Research | Nashed A.W.,Alexandria University | Saleh I.H.,Institute of Graduate Studies and Research | Mohmed M.M.,Alexandria University
Journal of Physics: Conference Series | Year: 2014

Crude petroleum oils are complex mixtures of diverse hydrocarbons, in widely varying compositions, that originate from a variety of geological sources. Fluorescence emission spectra have been measured for two types of Egyptian crude petroleum oil, its light and heavy products over a broad range of excitation and emission wavelengths. Both types of crude oil products are characterized by spectral signatures with a differing topography: the number of fluorescent peaks, their coordinates (λex, λem) on the plane of the three dimensions spectrum, and the shape of the bands formed by the contour line density, changeable in either direction. The refined light oil shows emission spectra at λmax between 350 and 500 nm according to the excitation wavelength. The refined heavy oil shows very broad unstructured emission spectra with λmax > 400 nm. As a group, they could certainly be distinguished from the light oil samples and most of the crude oil. © Published under licence by IOP Publishing Ltd.

Aboul Ezz S.M.,National Institute of Oceanography and Fisheries of Egypt | Abdel Aziz N.E.,National Institute of Oceanography and Fisheries of Egypt | Abou Zaid M.M.,Al - Azhar University of Egypt | El Raey M.,Institute of Graduate Studies and Research | Abo-Taleb H.A.,Al - Azhar University of Egypt
Egyptian Journal of Aquatic Research | Year: 2014

Rotifers are one of the most common, abundant components of plankton in the coastal waters of the Mediterranean Sea, which means that they can be used as bio-indicators and provide useful information on the long-term dynamics of the El-Mex Bay ecosystem. Rotifera species were quantitatively and qualitatively assessed in the El-Mex Bay, west of Alexandria at eight stations to study spatial, temporal, dominance, and abundance of the rotifer community and their relation with changes in environmental conditions. Samples were collected seasonally from autumn 2011 to autumn 2012. Ecological parameters were determined and correlated with total rotifers abundance to gain information about the forces that structure the rotifer community in this dynamic environment. A total of 38 rotifer species were identified belonging to 16 genera within 12 families and 3 orders under one class and contributed about 12.1% of the total zooplankton in the study area with an average of 1077 specimens/m3. Maximum density was observed in summer 2012 with an average of 1445 specimens/m3. During autumn 2011 rotifers appeared in low density (434 specimens/m3). The predominant species Ascomorpha saltans, Brachionus urceolaris, Synchaeta oblonga, Synchaeta okai, Synchaeta pectinata and Synchaeta tremula were recorded in all study stations of the bay. Salinity, temperature, depth, and chlorophyll-a concentration were the most important environmental factors co-related with the abundance of rotifers in the El-Mex Bay. A significant positive correlation between the total rotifer abundance and chlorophyll-a was observed during winter 2012 and summer 2012 (r = 0.763 and r = 0.694, respectively, at p ≤ 0.05). © 2014 Production and hosting by Elsevier B.V. on behalf of National Institute of Oceanography and Fisheries.

Abou Zaid M.M.,Al - Azhar University of Egypt | El Raey M.,Institute of Graduate Studies and Research | Aboul Ezz S.M.,National Institute of Oceanography and Fisheries of Egypt | Abdel Aziz N.E.,National Institute of Oceanography and Fisheries of Egypt | Abo-Taleb H.A.,Al - Azhar University of Egypt
Egyptian Journal of Aquatic Research | Year: 2014

Seasonal abundance, biomass, and taxonomic composition of copepods in El-Mex Bay (Southeastern Mediterranean region) were studied from autumn 2011 to 2012. Most species within the copepod communities displayed a clear pattern of succession throughout the investigation period. Generally copepods were the predominant group. They contributed numerically 57% of the total zooplankton counts with an average of 5083organisms/m3 and a total number of 203,333 individuals. The bay harbored 50 species belonging to 28 genera within 19 families and 4 orders under one class. Calanoids were represented by 24 species which formed 31.6% of total copepods predominantly Acartia clausi, Calocalanus pavo, Clausocalanus furcatus, Eucalanus crassus, Nannocalanus minor, Paracalanus parvus, Eucalanus subcrassus, and Temora longicornis. Cyclopoids comprised 13 species of which Acanthocyclops americanus, Halicyclops magniceps, Oithona attenuata, and Oithona nana were the most abundant adult copepods. Eleven Harpacticoid species were also recorded with Euterpina acutifrons, Microsetella norvegica, Onychocamptus mohammed being the most prevalent. It was found however, that two Poecilostomatoida species were rarely encountered in the plankton Oncaea minuta and Corycaeus typicus. Copepod larvae and copepodite stages formed the main bulk of copepod Fauna as noticed in the El-Mex Bay during the investigation period. Their percentage was 36.7% of the total count and their total numbers were 74,629 individuals with an average of 1866organisms/m3. The persistent relationships between total copepod counts, copepod orders, and physico-chemical variables suggested that physical factors operate on the copepod communities, either directly to limit maximum distribution along the bay, or indirectly on abundance. © 2014.

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