Digital Commons Network^™

Electrospun Mesoporous Mn-V-O@C Nanofibers For High-Performance Asymmetric Supercapacitor Devices With High Stability, Menna Samir, Nashaat Ahmed, Mohamed Ramadan, Nageh Khalaf Allam

Faculty Journal Articles

Supercapacitors (SCs) are being considered the next-generation power storage devices due to the many favorable properties. In this regard, mesoporous nanostructures are excellent supercapacitor electrodes as they enjoy a large number of active sites and high surface area promising the utilization of the full capacitance of the active materials. In this study, we report on the assembly of electrospun, binder-free mesoporous Mn0.56V0.42O@C fibrous electrodes. The morphological and structural analyses of the fabricated Mn0.56V0.42O@C electrodes were investigated using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and glancing angle X-ray diffraction (GAXRD). The X-ray photoelectron spectroscopy (XPS) and …

Exploring The Use Of Nearpod In Undergraduate Financial Accounting Classes, Nermeen Fathy Ahmed Shehata, Caroline Mitry, Maha Shawki

Faculty Journal Articles

No abstract provided.

Ferroelectret Materials And Devices For Energy Harvesting Applications, Mustafa Hani Arafa

Faculty Journal Articles

This paper provides an overview of ferroelectret materials for energy harvesting applications. These materials take the form of a cellular compliant polymer with polarised pores that provide a piezoelectric response to generate electrical energy as a result of an applied strain or surrounding vibration. The manufacturing processes used to create ferroelectret polymer structures for energy harvesting are discussed, along with the range of microstructural features and pore sizes that are formed. Their important mechanical, electrical and harvesting performance are then described and compared. Modelling approaches for microstructural design or for predicting the vibrational and frequency dependent response are examined. Finally, …

First Observation Of The Directed Flow Of D0 And D0 ̄ In Au+ Au Collisions At Snn= 200 Gev, Ahmad Hamed

Faculty Journal Articles

We report the first measurement of rapidity-odd directed flow (v1) for D0 and D0̄ mesons at midrapidity (|y|<0.8) in Au+Au collisions at sNN=200 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10-80% Au+Au collisions, the slope of the v1 rapidity dependence (dv1/dy), averaged over D0 and D0̄ mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum pT above 1.5 GeV/c. The absolute value of D0 meson dv1/dy is about 25 times larger than that for charged kaons, with 3.4σ significance. These data give a unique insight into the initial tilt of the produced matter, and offer constraints on the geometric and transport parameters of the hot QCD medium created in relativistic heavy-ion collisions.

Finite-Energy Spatiotemporally Localized Airy Wavepackets, Amr Mohamed Shaarawi

Faculty Journal Articles

The time-diffraction technique introduced by Porras recently is motivated in this article in terms of the Lorentz invariance of the equation governing the narrow angular spectrum and narrowband temporal spectrum paraxial approximation and it is used to derive finite-energy spatiotemporally confined subluminal, luminal and superluminal Airy wave packets. In addition, a novel exact finite-energy luminal Airy splash mode-type solution to the scalar wave equation is derived using Bateman’s conformal transformation.

Comparative Metabolome-Based Classification Of Senna Drugs: A Prospect For Phyto-Equivalency Of Its Different Commercial Products, Mohamed Ali Farag

Faculty Journal Articles

The demand to develop efficient and reliable analytical methods for the quality control of nutraceuticals is on the rise, together with an increase in the legal requirements for safe and consistent levels of its active principles. Objective: To establish a reliable model for the quality control of widely used Senna preparations used as laxatives and assess its phyto-equivalency. Methods: A comparative metabolomics approach via NMR and MS analyses was employed for the comprehensive measurement of metabolites and analyzed using chemometrics. Results: Under optimized conditions, 30 metabolites were simultaneously identified and quantified including anthraquinones, bianthrones, acetophenones, flavonoid conjugates, naphthalenes, phenolics, and …

Computational Design Of Novel Hydrogen-Doped, Oxygen-Deficient Monoclinic Zirconia With Excellent Optical Absorption And Electronic Properties, Sarah A. Tolba, Nageh Khalaf Allam

Faculty Journal Articles

Monoclinic ZrO2 has recently emerged as a new highly efficient material for the photovoltaic and photocatalytic applications. Herein, first-principles calculations were carried out to understand how Hydrogen doping can affect the electronic structure and optical properties of the material. The effects of Hydrogen interstitial and substitutional doping at different sites and concentrations in m-ZrO2 were examined by an extensive model study to predict the best structure with the optimal properties for use in solar energy conversion devices. Hydrogen interstitials (Hi) in pristine m-ZrO2 were found to lower the formation energy but without useful effects on the electronic or optical properties. …

Correlation Between Microstructural Defects And Photoelectrochemical Performance Of 1d Ti--Nb Composite Oxide Photoanodes For Solar Water Splitting, Nageh Khalaf Allam, Mahmoud Farag, Aya A. Saleh

Faculty Journal Articles

We report on the optimized fabrication of ultrathin wall nanotubes grown on Ti–Nb alloy via anodization in organic-based electrolytes. The nanotubes are vertically aligned with wall thicknesses of 5–8 nm, diameters of 180–200 nm, and lengths of 2–2.8 μm. Raman spectroscopy and glancing angle x-ray diffraction (GAXRD) measurements indicated the formation of composite oxides of anatase TiO2 and monoclinic Nb2O5. The composite oxides showed better stability at elevated temperatures up to 650 ᵒC and with much smaller induced microstrain compared to the TiO2 counterpart. X-ray photoelectron spectroscopy (XPS) analysis confirmed the composition of the fabricated nanotubes as a mixed TiO2–Nb2O5 …

Influence Of Pickling Process On Allium Cepa And Citrus Limon Metabolome As Determined Via Mass Spectrometry-Based Metabolomics, Mohamed Ali Farag

Faculty Journal Articles

Brine, the historically known food additive salt solution, has been widely used as a pickling media to preserve flavor or enhance food aroma, appearance, or other qualities. The influence of pickling, using brine, on the aroma compounds and the primary and secondary metabolite profile in onion bulb Allium cepa red cv. and lemon fruit Citrus limon was evaluated using multiplex metabolomics technologies. In lemon, pickling negatively affected its key odor compound “citral”, whereas monoterpene hydrocarbons limonene and γ-terpinene increased in the pickled product. Meanwhile, in onion sulphur rearrangement products appeared upon storage, i.e., 3,5-diethyl-1,2,4-trithiolane. Profiling of the polar secondary metabolites …

Isolation Of Anticancer And Anti-Trypanosome Secondary Metabolites From The Endophytic Fungus Aspergillus Flocculus Via Bioactivity Guided Isolation And Ms Based Metabolomics, Mohamed Ali Farag

Faculty Journal Articles

This study aims to identify bioactive anticancer and anti-trypanosome secondary metabolites from the fermentation culture of Aspergillus flocculus endophyte assisted by modern metabolomics technologies. The endophyte was isolated from the stem of the medicinal plant Markhamia platycalyx and identified using phylogenetics. Principle component analysis was employed to screen for the optimum growth endophyte culturing conditions and revealing that the 30-days rice culture (RC-30d) provided the highest levels of the bioactive agents. To pinpoint for active chemicals in endophyte crude extracts and successive fractions, a new application of molecular interaction network is implemented to correlate the chemical and biological profiles of …

Longitudinal Double-Spin Asymmetry For Inclusive Jet And Dijet Production In P P Collisions At S= 510 Gev, Ahmad Hamed

Faculty Journal Articles

We report the first measurement of the inclusive jet and the dijet longitudinal double-spin asymmetries, ALL, at midrapidity in polarized pp collisions at a center-of-mass energy s=510 GeV. The inclusive jet ALL measurement is sensitive to the gluon helicity distribution down to a gluon momentum fraction of x≈0.015, while the dijet measurements, separated into four jet-pair topologies, provide constraints on the x dependence of the gluon polarization. Both results are consistent with previous measurements made at s=200 GeV in the overlapping kinematic region, x>0.05, and show good agreement with predictions from recent next-to-leading order global analyses.

Manufacturing Of Wood–Plastic Composite Boards And Their Mechanical And Structural Characteristics,, Passant Youssef, Khaled Nassar, Mohamed Darwish, Salah El Haggar

Faculty Journal Articles

Engineered wood products including wood-plastic composites have been manufactured with different mix designs and different manufacturing techniques within the last years. However, there are still some materials that are not used to manufacture such composites, like recycled high-density polyethylene and camphor wood, although they are available in good quantities as industrial by-products. In this research, wood-plastic composite (WPC) panels were manufactured from high-density polyethylene (HDPE) plastic waste at 20%, 25%, 30%, 35%, and 40% of total weight together with camphor wood waste. Physical, mechanical, and structural properties of the panels were studied and compared according to current standards. The results …

Marine Natural Products: A Source Of Novel Anticancer Drugs, Mohamed Ali Farag

Faculty Journal Articles

Cancer remains one of the most lethal diseases worldwide. There is an urgent need for new drugs with novel modes of action and thus considerable research has been conducted for new anticancer drugs from natural sources, especially plants, microbes and marine organisms. Marine populations represent reservoirs of novel bioactive metabolites with diverse groups of chemical structures. This review highlights the impact of marine organisms, with particular emphasis on marine plants, algae, bacteria, actinomycetes, fungi, sponges and soft corals. Anti-cancer effects of marine natural products in in vitro and in vivo studies were first introduced; their activity in the prevention of …

Measurement Of Away-Side Broadening With Self-Subtraction Of Flow In Au+Au Collisions At √Snn = 200 Gev, Ahmad Hamed

Faculty Journal Articles

High transverse momentum (PT) particle production is suppressed owing to the parton (jet) energy loss in the hot dense medium created in relativistic heavy-ion collisions. Redistribution of energy at low-to-modest PT has been difficult to measure, owing to large anisotropic backgrounds. We report a data-driven method for background evaluation and subtraction, exploiting the away-side pseudorapidity gaps, to measure the jetlike correlation shape in Au+Au collisions at √SNN = 200 GeV in the STAR experiment. The correlation shapes, for trigger particles and various associated particle PT ranges within, are consistent with Gaussians, and their widths increase with centrality. The results indicate …

Measurement Of D0 -Meson + Hadron Two-Dimensional Angular Correlations In Au+ Au Collisions At Snn =200 Gev, Ahmad Hamed

Faculty Journal Articles

Open heavy-flavor hadrons provide unique probes of the medium produced in ultrarelativistic heavy-ion collisions. Due to their increased mass relative to light-flavor hadrons, long lifetime, and early production in hard-scattering interactions, they provide access to the full evolution of the partonic medium formed in heavy-ion collisions. This paper reports two-dimensional (2D) angular correlations between neutral D mesons and unidentified charged particles produced in minimum-bias Au+Au collisions at sNN=200GeV. D0 and D¯0 mesons are reconstructed via their weak decay to Kπ± using the Heavy Flavor Tracker in the Solenoidal Tracker at RHIC experiment. Correlations on relative pseudorapidity and azimuth (Δη,Δφ) are …

Design Considerations Of Highly Efficient D-Shaped Plasmonic Biosensor, Mohamed Swillam

Faculty Journal Articles

Design considerations of photonic crystal fiber (PCF) surface plasmon biosensor with high sensitivity to monitor glucose concentration is reported and studied. Based on a well-known large mode area (LMA) single mode PCF, two different configurations have been studied to investigate the impact of the etching process on the biosensor sensitivity. Furthermore, the possibility of infiltrating one hole by a plasmonic material to increases the biosensor sensitivity is studied. A full vectorial finite element method (FVFEM) is used to carry out the analysis of the reported biosensor. In addition, the geometrical parameters of the suggested biosensors have been optimized to obtain …

Eco-Friendly, One-Step Synthesis Of Cobalt Sulfide-Decorated Functionalized Graphene For High-Performance Supercapacitors, Dalia M. El-Gendy, Israa M. Afifi, Nageh Khalaf Allam

Faculty Journal Articles

A simple approach is demonstrated to prepare functionalized spongy graphene/cobalt sulfide (FG-CoS)nanocomposites as interconnected, porous 3-dimensional (3D)network crinkly sheets. Such crinkly sheets contain the reduced spongy graphene oxide (SGO)sheets and the intercalated CoS nanoparticles within the spongy graphene. The fabricated FG-CoS composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and Raman spectroscopy. The synthesized materials were tested as supercapacitor materials in 3 M KOH using cyclic voltammetry (CV)at different potential scan rates, and galvanostatic charge/discharge tests at different current densities. The FG-CoS electrodes showed a maximum specific capacitance of 1072 F/g at a …

Effect Of Grilling As Processing Method On Zea Mays (Corn) Metabolites Composition As Analyzed Via Spme Gc-Ms And Chemometrics, Mohamed Ali Farag

Faculty Journal Articles

Zea mays L. is a worldwide economical crop that is used as a food for man or as animal fodder owing to its rich nutritive composition. Despite being extensively studied, grilling effect on corn flavor and chemistry has yet to be reported. Impact of grilling at different degrees, light grilled corn (LGC) versus heavy grilled corn (HGC) on metabolite profile of Z. mays was assessed in this study using a holistic approach via SPME GC-MS and multivariate data analysis. A total of 39 volatiles were identified post-grilling to encompass pyrazines, phenols, pyrroles, furans, and aldehydes, with pyrazines likely to mediate …

Effect Of Ni-Ferrite And Ni-Co-Ferrite Nanostructures On Biogas Production From Anaerobic Digestion, Muhammed S. Abdallah, Fatma Y. Hassaneen, Yasmin Faisal, Mohy S. Mansour, Hanadi Ahmed Salem

Faculty Journal Articles

Many Nanoparticles (NPs) were reported to significantly enhance the production of biogas from the anaerobic digestion of organic wastes. Herein, two types of NPs (Ni-Ferrite and Ni-Co-Ferrite) were synthesized using the co-precipitation method and characterized using X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM) with energy dispersive X-ray spectroscopy (EDS) techniques. Three different concentrations (20, 70 and 130 mg/l) of each type were added to separate biogas reactors to study their effect on the biogas production compared to blank reactor. A pressure-based biogas reactor was designed and manufactured specifically to test the effect of the NPs on the anaerobic …

Effective Capacity Optimization For Cognitive Radio Networks Under Primary Qos Provisioning, Karim Gomaa Seddik

Faculty Journal Articles

Cognitive radios have emerged as a key enabler for opportunistic spectrum access, in order to tackle the wireless spectrum scarcity and under utilization problems over the past two decades. In this paper, we aim to enhance the secondary user (SU) performance while maintaining the desired average packet delay for the primary user (PU). In particular, we investigate the trade-off between delay-constrained primary and secondary users in cog- nitive radio systems. In the first part of this work, we use the hard-sensing scheme to make a decision on the PU activity and maximize the SU effective capacity subject to an average …

Electrochemical Nano-Patterning Of Brass For Stable And Visible Light-Induced Photoelectrochemical Water Splitting, Dina S. Eissa, Shimaa S. El-Hagar, Nageh Khalaf Allam

Faculty Journal Articles

A novel propitious nano-patterned brass oxide nanowires were fabricated via controlled anodization of α-brass in aqueous electrolytes at room temperature. X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS)techniques were used to investigate the morphology, structure, and composition of the fabricated materials. The morphology of the resulted structures was found to depend on the concentration of the sodium bicarbonate used for anodization as well as the post treatment. The XRD analysis confirmed the existence of both ZnO and CuO. The XPS results suggest the formation of CuZnO nanowires. The fabricated nanowires showed exceptional optical activity …

Electrospun Lead-Free All-Inorganic Double Perovskite Nanofibers For Photovoltaic And Optoelectronic Applications, Ayat N. El-Shazly, Marwan Y. Rezk, Kareem M. Gameel, Nageh Khalaf Allam

Faculty Journal Articles

Organic-inorganic hybrid perovskite compounds are currently the archetypal materials for high performance photovoltaic (PV) and optoelectronic devices. However, the remaining bottlenecks preventing their large-scale production are their environmental/thermal instability and lead toxicity. Herein, we demonstrate a novel approach to synthesize single-phase electrospun Cs2SnIxCl6-x double perovskites with varying halide content (I, Cl, or mixed I/Cl) as active materials for potential application in perovskite solar cells (PSCs). The X-ray photoelectron spectroscopy and Raman spectroscopy analyses indicated the in situ formation of graphene oxide (GO) during the annealing process. The GO layer was found to enhance the optical properties and thermal stability of …

Experimental And Density Functional Theory Insights Into The Effect Of Withdrawing Ligands On The Fluorescence Yield Of Ru (Ii)-Based Complexes, Basant A. Ali, Nageh Khalaf Allam

Faculty Journal Articles

The quality of emission spectra of metal complexes gives good insights into their performance in many optoelectronic applications. Herein, the effect of the number and position of various ligand structures on the emission spectra of Ru bipyridine complexes was studied. Specifically, the use of a different number of withdrawing groups (COOH) was investigated in detail. The complexes were first investigated using density functional theory (DFT) and time-dependent DFT calculations and then confirmed experimentally. The bandgap energy, reactivity, emission spectra and Stokes shift were found to depend on the number and position of the withdrawing groups attached to the Ru(bpy)22+ complexes. …

Fabrication Of Novel Formulations From Rigid Polyurethane Foams And Mortar For Potential Applications In Building Industry, Sonia Zulfiqar

Faculty Journal Articles

Rigid polyurethane (PU) foams are widely used in modern life owing to excellent strength and weight carrying capacity. Most of the rigid PU foams in the market are based on polypropylene oxide (PPO) and methylene diphenyl diisocyanate. Amine catalysts, especially tertiary amines, are used to balance both the gelling and gas-foaming reactions, responsible for foam formation. The objective of present work is to prepare rigid PU foams from PPO based polyol and 4,4′- methylene diphenyl diisocyanate (MDI). The morphological and mechanical properties of polyurethane foam using tertiary amine and water blowing agent have been investigated. Moreover, acoustic and thermal insulation …

Facile Microwave-Assisted Synthetic Approach To Palladium Nanoparticles Supported On Copper Oxide As An Efficient Catalyst For Heck And Sonogashira Cross- Coupling Reactions, Tamer Tawhid El-Idreesy

Faculty Journal Articles

A simple green one-step method for the synthesis of highly active palladium nanoparticles embedded on copper oxide as an efficient catalyst for ligand-free Heck and Sonogashira cross-coupling reactions has been developed. The synthetic approach is based on Microwave (MW)-assisted simultaneous chemical reduction of an aqueous solution of palladium and copper salts using hydrazine hydrate as the reducing agent. Selected characterization of the catalyst with transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction spectroscopy (XRD) reveal a size range of 25±2nm for the generated catalyst nanoparticles with the highest catalytic activity. The use of the generated Pd/CuO nanoparticles …

Miracles And Home Births: The Importance Of Media Representations Of Birth, Molly Wiant Cummins

Communication Faculty Publications - Archive

Since most women do not experience birth firsthand before giving birth themselves, many U.S. American birthing women draw knowledge from media representations for understanding what to expect during delivery. Most media representations of birth uphold a medical model, presenting many women with limited options for birth and reducing the agency available to women in their healthcare choices. Lack of choice and agency play into some of the issues surrounding the high rate of maternal mortality in the U.S., compared to other developed nations. This paper analyzes “The Miracle of Birth” scene from Crazy Ex-Girlfriend and Darci’s home birth on Jane …

Technology Safety Audit In Computer Laboratories Using Iso/Iec 17799 : 2005 (Case Study: Ftk Uin Sunan Ampel Surabaya), Muqoffi Khosyatulloh, Nurul Fariidhotun Nisaa, Ilham, M. Kom

Library Philosophy and Practice (e-journal)

Management audit is very important for assessment of their information technology management to gain efficient and effective business running process. Information technology security as an effort of internal controlling for risk and threat security minimization, is mainly considered due to all learning and lecturing administration activities use information technology. Allso, the implementation of a number of computer labs to facilitate learning processes and access to information in order to support the lectures and personal development of students To find out how secure technology information is, it is then requiring an audit to make sure everything run based on procedure. Management …

All Are Welcome? Southern Hospitality And The Politics Of Belonging, Betsie Garner, Andrew Harvard

Study the South

The elective affinity between southern hospitality and Christian hospitality functions as a moral framework for negotiating change and debating identity politics. An ethnographic community study conducted in Rockdale County, Georgia between 2014 and 2017 focused on the discourse and practice of southern hospitality.

Illustrations by Andrew Harvard.

Effect Of Repeated Readings And Positive Praise On Reading Comprehension, Lisa Stroeing

Dissertations, Theses, and Projects

This research is about repeated readings among 5th graders and the effect of praise or acknowledgement of different areas on a student's reading comprehension and fluency. Three test groups were given a six week intervention of repeated readings with one group receiving praise for fluency gains, one for comprehension gains and one group was give no praise. After six weeks of intervention, benchmark assessments were given to the three groups as well as the control.

Reflections Of Growth As A Counselor Trainee, Rachelle Brown

Dissertations, Theses, and Projects

Abstract

This Plan B project aims to highlight the development of self-awareness that took place for me over the course of my time in the Counseling graduate program. Throughout this project, I draw from a reflection of my own personal experiences throughout my childhood, as well as my current experiences at my internship site, The Rape and Abuse Crisis Center (RACC). I also highlight the objective knowledge I have gained in the form of assessments, as well as data from personal interviews in order to consider the perspectives of others. This project also includes emphasizes my newly formed philosophical conceptualization …