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Low Power Digital Circuits for Giga-Hertz VLSI GaAs FER Technology
Eldin,A. G. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
The maximum power dissipation limits the complexity of digital GaAs FET integrated circuits while the uniformity of the device parameters determines the functional yield. In this paper, new digital GaAs FET circuit structures are presented. These circuits do not dissipate do power, have .an area that is 50% of that of the conventional static circuits and have higher functional yield as a result of their larger tolerance to device parameters variations.
A Highly Efficient and Reliable DRAM Synthesis Algorithm for VLSI Embedded Memories
Eldin, A .G. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
In many applications, the embedded DRAM provides the optimum combination of very high density, low power and high performance. For ASIC's to take full advantage of this design strategy, an efficient and highly reliable DRAM compiler must be used. The DRAM architecture, cell, peripheral circuits and the algorithm of a high performance memory compiler are presented.
( Hussam Eldin Elzain ),( Sang Yong Chung ),( Venkatramanan Senapathi ),( Kye-hun Park ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
This study used the artificial intelligence methods of adaptive neuro-fuzzy (ANFIS) and artificial neural networks (ANN) to evaluate the groundwater contamination vulnerability in Miryang City, Korea. The original DRASTIC method for the evaluation has been using 7 factors of Depth to water, net Recharge, Aquifer materials, Soil media, Topography, Impact of vadose zone and Hydraulic Conductivity. In this study, the factor of land use was added to the original DRASTIC method because large agriculture fields extensively exist in the alluvial plain of the study area in addition to the industrial, urban, livestock and landfill areas. The models used 95 data of nitrate-nitrogen (NO3-N) concentrations from monitoring groundwater wells for training and validation purposes of ANFIS and ANN. The superiority of the two methods was examined by the graphical and statistical methods. The graphical method showed the correlations between ANN Index and ln (NO3-N), and between ANFIS Index and ln (NO3-N). The determination coefficients were 0.65 for ANN and 0.84 for ANFIS, respectively. The root means square errors (RMSE) of ANN and ANFIS were 0.071 and 0.059, respectively. Thus, ANFIS was more superior to ANN through graphic and statistical evaluations. By the level of importance based on the sensitivity analysis of the ANN model, hydraulic conductivity, land use and impact of the vadose zone were the most important factors in the order affecting the groundwater vulnerability in the study area.
Shehab-ElDin Amira Nagy,Sobh Rokaya Aly,Rabie Abdelgawad Mohamed,Mohamed Wael Sabry,Nasr Hanaa Elsayed 한국약제학회 2023 Journal of Pharmaceutical Investigation Vol.53 No.2
Purpose Current innovations in pharmaceutical industries involve the design of functionalized materials for drug delivery applications. Hybrid-bilayer patches of electrospun polyamide 6/tallow modified clay nanocomposite fibers coupled with hydrogels comprising sodium alginate (NaAlg), polyvinyl alcohol (PVA), or a mixture of both were developed. Methods The hydrogel precursors were crosslinked either ionically using a CaCl2 solution or physically through repeated freezing–thawing cycles to avoid toxic crosslinking agents. Doxycycline hydrochloride was loaded either by adsorption or active loading methods. The hybrid bilayer patches were evaluated for their physicochemical and morphological properties. Furthermore, in vitro drug release studies in phosphate-buffered saline (PBS) (pH 7.4) and acetate buffer (pH 5.5) were performed, along with antimicrobial activity and toxicity tests. Results An increase in the NaAlg ratio caused a gradual decrease in the gel content while greatly increasing the swelling ability. Porous structures were also produced. The in-vitro drug release profiles and corresponding kinetics were mainly dependent on structural factors. An initial burst release was observed from the CaAlg nanofibers (approximately 61.5% ± 0.68% and 52% ± 1.22% of the drug was released during the first 2 h in PBS and acetate buffer, respectively), whereas a relatively slow release rate was achieved from the nanofibers of the physically crosslinked PVA or PVA/NaAlg. The antimicrobial test confirmed that the loaded drug retained its antimicrobial efficacy. The toxicity test using the “Microtox analyzer model 500” exhibited EC50 ≥ 100, indicating no toxic effect against the luminescent marine bacteria Vibrio fischeri. Conclusion The fabricated functionalized patches showed great potential for topical/transdermal drug delivery.
Zaki Eldin Ali Abdalla,Asma Tufail,Baoshan Li 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.6
Phosphate promoted Na2WO4/Al2O3 catalyst with 10 wt.% tungsten was prepared by simple impregnation method. Analytical characterization results showed that tungstate and phosphate were uniformly dispersed in alumina matrix and its structural properties were preserved. The effect of phosphate as promoter in catalyst activity was studied using dibenzothiophine (DBT) as model oil and the results reveal that it plays an important role in oxidation activity of Na2WO4/Al2O3 catalyst, in addition, the catalytic activity of Na2WO4/Al2O3 was increased gradually with increasing phosphorus contents up to 2.5 wt.%. The catalyst was recycled and the results show that no significant decrease in catalyst activity was observed even after five recycled runs. We also applied our catalyst in oxidative desulfurization (ODS) of FCC diesel oil (with sulfur contents 4100 ppm), andmore than 92% of sulfur was removed from diesel oil under mild reaction conditions
Effectiveness of dredging and drains’ treatment on water quality of Rosetta branch
Mohie Eldin M. Omar,Mohamed A. Ghareeb,Shaimaa El Sherbini 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1
Rosetta Branch of Nile River in Egypt receives drainage water from five agricultural drains deteriorating its water quality. Since the branch is used for irrigation and municipal purposes, its water quality should be enhanced. Hence, the current paper aimed at providing the most effective intervention to improve the branch water quality. Preventing drainage disposal was excluded due its significance to downstream users. The paper investigated the impacts of drains" treatment and branch dredging on hydrodynamics and water quality. The branch was numerically simulated using HECRAS model, and calibrated using measured water levels and quality parameters. The paper selected constructed wetlands as the most suitable method for drainage treatment based on conditions of study area. SUBWET model predicted optimal designs of wetlands achieving the desired treatment efficiency. SUBWET model was calibrated with experimental wetlands at Delta Barrage. Results showed that 1-m dredging dropped water surface elevations by 22 to 50 cm. Dredging had no significant changes in the backwater zone of Edfina Barrage at the branch end except for the maximum flow case. Simulation of dissolved oxygen and ammonium showed that dredging and treatment improved water quality. Drains’ treatment by constructed wetlands with selected designs was much more effective than dredging.