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Electrochemical Deposition and Optimization of Thermoelectric Nanostructured Bismuth Telluride Thick Films

Engineering（科研） 2011年第6期3卷 659-667页

作者： Hesham M. A. Soliman abdel-hady B. kashyout 不详

Bismuth telluride thick films are suitable for thermoelectric (TE) devices covering large areas and operating at small-to-moderate temperature differences (20 - 200 K). High efficiency and high coefficient of performance (COP) are expected to be achieved by using thick films in some cooling applications. Bismuth telluride thick films fabrication have been achieved with Galvanostatic and Potentionstatic deposition. Stoichiometric bismuth telluride thick film was obtained by Galvanostatic deposition at current density of 3.1 mAcm-2. Bismuth telluride films with average growth rate of 10 μmh-1 and different composition were obtained. Effects of current density and composition of electrolyte in Galvanostatic deposition were studied. The current density affected the film compactness, where films deposited at lower current density were more compact than those deposited at higher current density. The morphology of the films did not depend on the current density, but chemical composition was observed when different composition of electrolyte was used. Effects of distance between electrodes, composition of electrolyte solution, and stirring in Potentionstatic deposition were studied. The shorter the distance between electrodes, the higher the electric field, thus the higher current density was applied and the deposited film was less compact. The current density increased more rapidly with stirring during electrodeposition which leads to less compact film. Through this study, films electrode-posited from solution containing 0.013 M Bi(NO3)3.5 H2O, 0.01 M TeO2 and 1 M HNO3 at 3.1 mA cm-2 for 6 hours without stirring and with interelectrode distance of 4.5 cm were free-standing with average film thickness of 60 μm and optimum film composition of Bi2Te3. The crystallite size of the later films was found to be around 4.3 nm using Scherrer’s equation from XRD patterns. Also, negative Seebeck coefficient for the same samples was revealed with an average value of -82 μV.K-1.

关键词： Bismuth Telluride Thermoelectric Electrodeposition Nanostructure Thick Film

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Fabrication of Congo Red/Oxidized Porous Silicon (CR/OPS) pH-Sensors

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Materials Sciences and Applications 2013年第8期4卷 79-87页

作者： abdel-hady kashyout Hesham M. A. Soliman Marwa Nabil Ahmed A. Bishara Advanced Technology and New Materials Research Institute City for Scientific Research and Technology Applications New Borg El-Arab City Alexandria Egypt Physics Department Faculty of Science Alexandria University Alexandria Egypt

The fabrication of nano porous silicon, nPSi, using alkali etching process has been studied and carried out. The surface chemistry of anisotropic etching of n-type Si-wafer is reviewed and the anisotropic chemical etching of silicon in alkaline solution using wetting agents is discussed. Transformation of crystallographic plane of n-Si (211) to nPSi (100) has occurred on using n-propanol as wetting agent. The rate of pore formation was 0.02478 - 0.02827 μm/min, which was heavily dependent upon the concentration of the etchant containing wetting agents, allowing patterned porous silicon formation through selective doping of the substrate. A particle size of 15 nm for porous nano-silicon was calculated from the XRD data. Porosity of PS layers is about 10%. Pore diameter and porous layer thickness are 0.0614 nm and 16 μm, respectively. The energy gap of the produced porous silicon is 3.3 eV. Furthermore, the combination of PS with Congo Red, which are nanostructured due to their deposition within the porous matrix is discussed. Such nano compounds offer broad avenue of new and interesting properties depending on the involved materials as well as on their morphology. Chemical route was utilized as the host material to achieve pores filling. They were impregnated with Congo Red, which gave good results for the porous silicon as a promising pH sensor.

关键词： Nano Porous Silicon Anisotropic Etching Process Alkali Etching Congo Red PH Sensor

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Combining Committee-Based Semi-Supervised Learning and Active Learning

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Journal of Computer Science & Technology 2010年第4期25卷 681-698页

作者： Mohamed Farouk abdel hady Friedhelm Schwenker Institute of Neural Information Processing University of Ulm

Many data mining applications have a large amount of data but labeling data is usually difficult, expensive, or time consuming, as it requires human experts for annotation. Semi-supervised learning addresses this problem by using unlabeled data together with labeled data in the training process. Co-Training is a popular semi-supervised learning algorithm that has the assumptions that each example is represented by multiple sets of features （views） and these views are sufficient for learning and independent given the class. However, these assumptions axe strong and are not satisfied in many real-world domains. In this paper, a single-view variant of Co-Training, called Co-Training by Committee （CoBC） is proposed, in which an ensemble of diverse classifiers is used instead of redundant and independent views. We introduce a new labeling confidence measure for unlabeled examples based on estimating the local accuracy of the committee members on its neighborhood. Then we introduce two new learning algorithms, QBC-then-CoBC and QBC-with-CoBC, which combine the merits of committee-based semi-supervised learning and active learning. The random subspace method is applied on both C4.5 decision trees and 1-nearest neighbor classifiers to construct the diverse ensembles used for semi-supervised learning and active learning. Experiments show that these two combinations can outperform other non committee-based ones.

关键词： data mining classification active learning co-training semi-supervised learning ensemble learning randomsubspace method decision tree nearest neighbor classifier

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Weaning preterm infants from continuous positive airway pressure: evidence for best practice

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World Journal of Pediatrics 2015年第3期11卷 212-218页

作者： Hesham abdel-hady Basma Shouman Nehad Nasef Neonatal Intensive Care Unit Mansoura University Children's HospitalMansouraEgypt

Background:Nasal continuous positive airway pressure(NCPAP)is frequently used in preterm ***,there is no consensus on when and how to wean them from *** sources:Based on recent publications,we have reviewed the criteria of readiness-to-wean and factors affecting weaning success.A special focus is placed on the methods of weaning from NCPAP in preterm ***:Practical points of when and how to wean from NCPAP in preterm infants are *** infants are ready to be weaned from NCPAP when they are stable on a low NCPAP pressure with no(or minimal)oxygen *** used to wean from NCPAP include:sudden weaning of NCPAP,gradual decrease of NCPAP pressure,graded-time-off NCPAP(cycling),weaning to high or low flow nasal cannula,and a combination of these *** best strategy for weaning is yet to be ***-off NCPAP increases the duration of NCPAP and length of hospital stay without beneficial effect on success of *** decrease of NCPAP pressure is more physiological and better tolerated than cycling-off ***:Further studies are needed to reach a consensus regarding the optimal timing and the best method for weaning from NCPAP in preterm infants.

关键词： continuous positive airway pressure preterm infant weaning

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Clinico-epidemiological features of dengue fever in Saudi Arabia

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Asian Pacific Journal of Tropical Medicine 2010年第3期3卷 220-223页

作者： abdel-hady El-Gilany abdelaziz Eldeib Sabri Hammad Public Health Family and Community Medicine DepartmentCollege of Medicine in Al-HassaKing Faisal University Ministry of Health

Objective:To highlight some clinical and epidemiological features of dengue ***: All patients who were admitted to hospitals in Holly Mecca City,Saudi Arabia and were confirmed as dengue fever(DF) or dengue hemorrhagic fever(DHF) were included in this study. The data were collected from patient files and through direct interview with patients or their *** were followed through their hospital *** laboratory investigations were done and diagnosis was confirmed by ***:Most of cases admitted in stable condition(94.37%) and only one case(1.41%) ***-1 and 3 types were the prevalent dengue viruses and cases in age group 16-44 were the most frequent(70.40%).The most common symptoms was fever reported from all cases followed by headache(74.60%),myalgia and anorexia(67.60%),back pain(59.20%) and chills(54.90%).DF represented(60.57%) of the cases while DHF represented(39.43%).About half of cases had underground water tanks for human use,5.60%had over house roof water tanks and 43.70%had both types,16.90% of these tanks were *** 70.00%of cases reported presence of small collection of water nearby houses and 46.80%reported the presence of mosquitoes within their ***:Most dengue fever cases might be endogenous in origin due to prevalence of mosquitoes and their breeding places within the houses and in nearby *** of mosquitoes and their breeding places will contribute to prevention of dengue fever.

关键词： Dengue fever(DF) Dengue haemorrhagic fever(DHF) Epidemiology Mosquitoes

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Chronic Hepatitis C Infection in Children: Current Treatment and New Therapies

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Journal of Clinical and Translational Hepatology 2015年第1期3卷 36-41页

作者： Andrew Lee Jeremy Rajanayagam Mona abdel-hady Birmingham Children's Hospital Liver Unit Birmingham United Kingdom The University of Queensland School of MedicineBrisbane Australia Birmingham Children's Hospital Liver Unit Birmingham United Kingdom University of Birmingham School of Infection and Immunity Birmingham United Kingdom Birmingham Children's Hospital Liver Unit Birmingham United Kingdom

Viral hepatitis C is responsible for a large burden of disease *** of hepatitis C infection is currently undergoing a revolution with the development of new direct acting antivirals that offer higher cure rates and fewer side effects than other medications currently *** options for children,although well-defined and evidencebased,are limited relative to adults as there are few trials regarding the use of these newly developed agents in *** so much optimism in the development of novel therapeutic options for hepatitis C,it is timely to review and summarize the current standard of care treatment and indications for treatment of chronic hepatitis C in *** provide here an overview of recent drug developments and their potential for use in children.

关键词： Hepatitis C Children Treatment Direct acting antivirals Host targeting agents

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Seroprevalence of hepatitis A antibodies among children in a Saudi community

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Asian Pacific Journal of Tropical Medicine 2010年第4期3卷 278-282页

作者： abdel-hady El-Gilany Sabry Hammad Khaled Refaat Reda Al-Enazi Family and Community Medicine Department College of Medicine in Al-HassaKing Faisal UniversitySaudi Arabia Preventive Medicine Directorate of Health of the Northern BordersSaudi Arabia Arar Central Hospital Saudi Arabia

Objective:To determine the current seroprevalence of antibodies against hepatitis A virus in selected group of children aged 1-6 years in Northern borders region,Saudi Arabia,and to identify risk factors for ***:A cross-sectional sero-epidemiological study of 950 children who attended 10 randomly selected primary health care centers(5 urban and 5 rural) was *** of all children were subjected to a questionnaire including sociodemographic and housing environmental *** determination of anti-HAV antibodies was carried out by ***:The prevalence of HAV-IgG was 33.8%overall,35.5%among males and 32.0%among females with no statistically significant *** logistic regression analysis revealed that increasing age,rural residence,non Saudi nationality,and non availability of safe municipal water source were the most important independent predictors for HAV seropositivity in the studied ***:There is a clear decrease in hepatitis A prevalence in the studied children particularly in urban areas and indicates that a transition may be underway to intermediate endemicity and possible shift of the risk to the adult age with increased ***,we recommend including Hepatitis A in the schedule of routine childhood vaccinations.

关键词： Hepatitis A Seroprevalence Risk factors

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Novel CYP1B1 mutations and a possible prognostic use for surgical management of congenital glaucoma

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International Journal of Ophthalmology(English edition) 2019年第4期12卷 607-614页

作者： Mohamed M.Khafagy Nadia El-Guendy Marwa A Tantawy Mohamed A.Eldaly Hala M.Elhilali abdel hady A.abdel Wahab Ophthalmology Department Faculty of Medicine Cairo University Cancer Biology Department National Cancer Institute Cairo University Research Department Children's Cancer Hospital

AIM: To identify CYP1B1 gene mutations and evaluate their possible role as a prognostic factor for success rates in the surgical management of Egyptian congenital glaucoma ***: Totally 42 eyes of 29 primary congenital glaucoma patients were operated on with combined trabeculotomy/trabeculectomy with mitomycin-C and followed up at 1 d, 1 wk, 1, 6 and 12 mo postoperatively. Genomic DNA was extracted from peripheral blood leukocytes. Coding regions of CYP1B1 gene were amplified using 13 pairs of primers, screened for mutations using single-strand conformation polymorphism followed by sequencing of both strands. Efficacy of the operation was graded as either a success [maintaining intraocular pressure(IOP) less than 21 mm Hg with or without antiglaucoma medication], or a failure(IOP more than 21 mm Hg with topical antiglaucoma medications). RESULTS: Seven novel mutations out of a total of 15 different mutations were found in the CYP1B1 genes of 14 patients(48.2%). The presence of CYP1B1 gene mutations did not correlate with the failure of the surgery(P=0.156, odds ratio=3.611, 95%CI, 0.56 to 22.89); while the positive consanguinity strongly correlated with failure of the initial procedure(P=0.016, odds ratio=11.25, 95%CI, 1.57 to 80.30). However, the Kaplan-Meier survival analysis revealed a significantly lower time of IOP control in the subgroup with mutations in CYP1B1 versus the congenital primary glaucoma group without mutations(log rank test, P=0.015).CONCLUSION: Seven new CYP1B1 mutations are identified in Egyptian patients. Patients harboring confirmed mutations suffered from early failure of the initial surgery. CYP1B1 mutations could be considered as a prognostic factor for surgery in primary congenital glaucoma.

关键词： CYP1B1 mutations primary congenital glaucoma intraocular pressure trabeculotomy/trabeculectomy with mitomycin-C.

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A Fundamental Equation of Thermodynamics that Embraces Electrical and Magnetic Potentials

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Journal of Electromagnetic Analysis and Applications 2010年第3期2卷 162-168页

作者： Salama abdel- hady 不详

This paper introduces an energy-analysis of the flow of electrical charges and magnetic flux in addition to the flow of heat into a thermodynamic system. The analysis depends on the results of a held experiment on a magnet that attracted iron balls and a Faraday’s discovery as well as similarities between the laws characterizing the flow of electric charges, magnetic flux and heat. As the electric charge and magnetic flux produce entropy changes in some applications as magnetic hysteresis and capacitive deionization, we may express the electric charges and magnetic flux in terms of entropy changes times their corresponding potentials by analogy to expressing heat as a product of temperature and entropy changes. Introducing such postulates into the held energy-analysis;a new fundamental equation of thermodynamics that embraces the flow of electric charges and magnetic flux in terms of the electric and magnetic potentials was derived. The derived equation proved its truth in numerous studies of general energy interactions. Such postulates help also in defining the electric charge and magnetic flux as categories of electromagnetic waves of assigned electric or magnetic potentials and offer plausible explanations of newly discovered phenomena in the fields of electromagnetism and thermodynamics as Kerr effect and magnetic expansion.

关键词： First and Second Laws of Thermodynamics Electromagnetic Waves Heat Flux Electric Charge Magnetic Flux

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Boundary-layer non-Newtonian flow over vertical plate in porous medium saturated with nanofluid

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Applied Mathematics and Mechanics(English Edition) 2011年第12期32卷 1577-1586页

作者： F.M. hady F. S. IBRAHIM S. M. abdel-GAIED M. R. EID Department of Mathematics Faculty of Science Assiut University Assiut 71516 Egypt Department of Science and Mathematics Faculty of Education Assiut University The New Valley 72111 Egypt

The free convective heat transfer to the power-law non-Newtonian flow from a vertical plate in a porous medium saturated with nanofluid under laminar conditions is investigated. It is considered that the non-Newtonian nanofluid obeys the mathematical model of power-law. The model used for the nanofluid incorporates the effects of Brown- ian motion and thermophoresis. The partial differential system governing the problem is transformed into an ordinary system via a usual similarity transformation. The numer- ical solutions of the resulting ordinary system are obtained. These solutions depend on the power-law index n, Lewis number Le, buoyancy-ratio number Nr, Brownian motion number Nb, and thermophoresis number Nt. For various values of n and Le, the effects of the influence parameters on the fluid behavior as well as the reduced Nusselt number are presented and discussed.

关键词： non-Newtonian free convection nanofluid porous media

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