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Study Of Heat Transfer Through Radially Buffled Rotating Annulus., Mohammed Hamza, Ahmed Sultan, Ali Elbouz

Mansoura Engineering Journal

This paper presents an experimental study of laminar forced convection heat transfer for cold water flows through annular tube. The test section consisted of two annular spaces the inner of which for the tested cold water while the outer for the heating water flow that heated in a tank by electrical heaters. The inner tube of the annulus is rotated with rotational speeds which varied from 175 to 650 p.m. The outer tube of the annulus have a constant diameter of 54.5mm but the diameter of inner tube of the annulus is equal to 21, 26.7 and 33.5 mm so …

Laboratory Characterization Of Asphalt Mixtures Containing Steel Slag., Mohamed Shiha, Alaa Gabr, Sherif El-Badawy

Mansoura Engineering Journal

The use of industrial by-products needs better understanding of their characteristics and behavior when subjected to traffic loading and environmental conditions. This paper presents a comprehensive laboratory characterization testing of asphalt mixtures containing steel slag. Electric Arc Furnace Steel Slag (EAFS) products were chosen as one of the most significant types of non-hazardous metallurgical waste, which were sourced from a steel factory in Egypt. The routine tests were conducted on EAFS materials to examine the physical, mechanical, and chemical properties, which were compared with the virgin aggregate (limestone). Blends of limestone aggregates/EAFS with percentages of 100/0, 80/20, 60/40, and 0/100% …

Precision Comparison And Analysis Of Reflector-Less Total Station Observations., Zaki Zeidan, Ashraf Beshr, Sara Sameh

Mansoura Engineering Journal

In order to achieve the results that meet the specifications of given project, such as setting out and monitoring the structural deformation, the knowledge of reliability and accuracy of surveying equipment is inevitable. Reflector-less total station are widely used nowadays for several applications in geodetic engineering due to its highly accurate and fast measurements. A shortcoming is that it gives less accurate measurements in some cases of observations. The point position determination using reflector-less total station is subjected to some uncertainty due to angle of observation, incidence angle of signal to the surface, distance from the instrument to the point, …

Support Of Conservation Education To Formulate A Better Future For Heritage Districts., Yasmine Sabry

Mansoura Engineering Journal

Heritage districts are a wealth, but most people don’t realize its value. In fact, human deterioration is one of the worst means of deterioration and actually the most common when it comes to heritage districts. This is due to residents’ or users’ bad behaviors towards the built structures in such districts. The cause of this behavior is the local community’s lack of awareness in heritage conservation being a part of the national identity; or even understanding its universal value if it exceeds the local value to become world heritage. In this research, we focus on how educational curriculums do not …

Simulation Of Pv Cells To The Vocabulary Learning Environment., Marwa Abdelhady, Alaa El-Eashy, Mona Elwazir

Mansoura Engineering Journal

The research light on the important issues of public concern, namely energy and outages constantly, the other is the poor level of education provided. Those were through the solutions that architects can do to society by working in two directions. Enter into the first field of renewable energy, especially solar power enjoyed by Egypt most the year at a rate of brightness11 hours a day, by the use of photovoltaic cells, which convert solar radiation into electrical energy in a direct way. Second the development of educational buildings and previous studies are considered sustainable buildings of the most successful models …

On Variational Inequalities And Their Application To The Obstacle Problem., M. Amer

Mansoura Engineering Journal

In this paper some existence results for the solution to the so called variational inequalities in real Banach space are established. Application of the established results to the obstacle problem, the prototype of many other moving and free boundary problems, is studied. We first investigate the case of an elastic string, then we extend our study in a natural way to the case of an elastic membrane stretched over a smooth obstacle.

Mathematical Modelling Of Transient Processes In The Capacitive Take-Off Power Network., Ibrahim Mansy, A. Aly, Saad Eskander

Mansoura Engineering Journal

This paper presents a mathematical modelling of the transient processes in a capacitive take-off power network. This model is based on the calculation of magnetic flux of a single-phase, two-winding transformer. This model is represented by non-linear equations. The short circuit occurs along the steel core, and the leakage flux coupling the separated coils closes out the side of core. The mathematical model is developed to investigate the conditions of transient process analysis in a capacitive take-off power network. The reduction of overvoltage during short circuit period is also studied in this paper. Also, this paper suggests the solution manner …

Experimental Investigation Of Hydrodynamic Multipads Floating Journal Bearing., Abdallah El-Toukhy

Mansoura Engineering Journal

A run of experimental tests have been undertaken for investigated various types of ring. Where the ring is splitt up into two pads, also, a ring is split up into four pads respectively. The effect of using different pads is then evaluated and the influence of different factors on performance is discussed under steady applied load conditions. Performance factors are described in terms of, supply pressure, friction torque oil flow rate, inlet-outlet temperature and ring speed. Results are reached on the relative credits of each control variable case. A reduction in friction torque ranges between 25% and 30% is obtained …

Study The Phenomena Of The Weft Twist Loss At Air-Jet Weaving Machine Picanol Pat-A., Ali Morsy

Mansoura Engineering Journal

In this research. the weft twist loss across the width of the fabric at air-jet weaving machine have been studied. The phenomena has been investigated considering the effect of the following parameters : - Speed of weaving machine (X1),(635, 755 ) p/min , for Ne 20 and Ne 30 and (605, 740) p/min , for Ne 40.- Measuring position across the fabric width (X2): two positions .-Yarn twist multiplier ( 3 ) :(3.4, 3.8, 4.2) .- Main nozzle pressure (X4 ): (4, 4.5, 5) bar, for Ne 20 and( 2.5, 3,3.5) bar, for Ne (30, 40). The phenomena of the …

Waveform Estimation Techniques For Event-Related Bioelectric Signals: A Comparative Study Of Performance., Fatma El-Zahraa Abou-Chadi

Mansoura Engineering Journal

Many bioelectric signals result from the electrical response of physiological system to an impulse that can be internal (ECG signals) or external levoked potentials). A comparative study of performance of seven waveiorm estimation techniques used for event-related signals that are time-locked to a stimulus is presented in this paper Computer generated signals and noise for several signal-to-noise ratios (SNR's) are used to make ensembles of simulated noisy waveforms. The performance of each technique is numerically investigated using the root-mean-squared error and two well known SNR estimators. The results show that an adaptive impulse correlated filter (AICF) performs the best. It …

Adaptive Enhacement Of Ambulatory Electrocardiograms., Fatma El-Zahraa Abou-Chadi

Mansoura Engineering Journal

Quality improvement of ambulatory electrocardiographic (ECG) signals is an important subject and crucial in computer aided diagnosis and monitoring. However, the poor quality of the signals necessitates signal enhancements. Hence, in this paper, three adaptive filter structures are presented to eliminate the diverse forms of noise. The performance of each technique 18 thoroughly investigated by simulated signals as well as signals obtained from human subjects. A two stage filter consisting of an adaptive noise cancellar and adaptive recurrent filter has been found to reduce efficiently the various types of noise while the characteristics of the relevant ECG signal is little …

Calculation Of Spinning Reserve Of The Egyptian Unified Power System., El-Husseini Abd-Raboh

Mansoura Engineering Journal

The importance of this paper is to evaluate the reliability of the unified power system arising from the necessity of the recognaition of the network problems, the availability of the generating units and the voltage and frequency variation limits in case of network accidents and the failure rates of the power plants components as a step towards the collection of this data. The probability of forced outage of the different generating units and the spinning reserve of the united power system are calculated by three methods: the binomial distribution method, the poisson method and monte carlo method which are usually …

Machinability Parameters In Finish Face Milling Of Low Alloy Cr-Ni Steel With Thr K30 Carbide Tool Part Ii: Surface Finish, Machined Surface. Texture, Minor Cutting Edge And Nature Of Chips., Fayez Abo-Gharbia

Mansoura Engineering Journal

The second contribution presents the results of finish face milling in which the performance of THR K30 reported in terms of surface roughness and machined surface alterations when a low alloy steel in its hardened conditions was milled. The assessment of surface finish and the mechanisms involved in particular front and back cutting were defined. Details are given corresponding to the geometry of tool, elastic deformation and feed marks transferred to surface during front curling. Also, in back cutting, the surface refining by burnishing process on the trailing end culling edge was comprehensively explained. The effect of minor flank wear …

A Contribution To The Study Of Flow Field And Heat Transfer On A Rearward - Facing Step., Awad El-Hadik

Mansoura Engineering Journal

The flow and convective heat transfer characteristics over a backward-facing step were investigated numerically and experimentally. Two different step-heights were studied for different Reynolds numbers. The point of reattachment of the flow behind the step proved to be the point of maximum heat transfer coefficient. The size of the separated region as well as the Nus sell number depended greatly on the Reynolds number. Downstream of reattachment, the heat transfer coefficient declined rapidly and followed gradually the contour of the turbulent hound ary layer. The results of the investigation were compared to others from the literature with sat-isfaction.

Evaluation Of Different Designs Of Thermal Storage In Solar Drying System., Najwa Khattab, Mahdy Badawy

Mansoura Engineering Journal

A simple, easy built forced convection solar drying system consisting of a solar air heater, drying chamber and thermal storage has been constructed and tested. A new simple pebble bed storage, with special and easy form was designed to be heated with direct solar energy or hot air from the heater or both. The drying system performance was studied under different locations of the storage box with respect to the drying chamber during 24 hours of operation. The performance of the drying system with the best location was studied under different flow rates.

Simulation Study Of Variable Structure Control Of An Unloaded Synchronous Generator Connected To An Infinite Bus., E. El-Shirbeeny, N. Aref, Fatma Mohamed

Mansoura Engineering Journal

The formulation of a variable structure excitation control system is presented for a synchronous generator at no-load . Factors influencing the design are investigated and properties of the generator excitation in sliding mode are revealed . It has been verified thro ugh a digital computer simulation that improved an dynamic performance is obtained. The existence of physical limits in the generator system degrades the quality of structure excitation characteristics. However, other characteristics are maintained yielding quicker response and reduced sensitivity to parameter changes.

Theoretical Comparison Between (Xi & C) Cores Of Homopolar Linear Synchronous Motor., S. El-Drieny

Mansoura Engineering Journal

This paper presents the comparison between two different geometries for the core of homo polar linear synchronous motor HLSM. The theoretical analysis estimated the airgap flux density , the attraction and traction forces This analysis is based on a magnetic field study using 3-dimensional finite difference method FDM of scalar magnetic potential. The average results of zero and infinite permeability boundaries is considered. The flux per pole, under a.c. limbs either in"C" or in " XI" core is taken for obtaining the majority of normal force. Results reveal that the " XI" core shape was the optimum form because it …

Finite Difference Modeling Of Autogeneous Tig Weld Pool Profiles., G. Nassef, M. Abdelrahman, A. El-Bahi

Mansoura Engineering Journal

In this paper experimental weld pools has been created in axisymetric specimens of low carbon steel by autogeneous gas tungsten are (GTA). Different conditions of are current nozzle size and are tune have been investigated. The weld pool profile has been measured and plotted in each case. A numerical heat transfer model that takes into account fluid flow in the weld pool was employed to simulates the development of GTA welding process. The model has been tested against the experimental results to deduce the optimum values of are efficiency and heat distribution parameter. The model provides far better fit to …

Liquid Spray Characterization Using Phase /Doppler Technique., Ramy El-Emam, A. Desoky, M. Tolba, K. El-Nahhas

Mansoura Engineering Journal

Spray characteristics of three liquids, water. diesel fuel, and kerosene. sprayed vertically downward in a transparent squared section rube which is accessed with an exhauster through Doppler Particle a pressure swirl atomizer, have been evaluated by means of Phase Analyzer (PIDPA) system. The experimental apparatus is accessed with a traversing system which enables to make complete scan. radially and axially, for the spray cone. Different pressure differentials across the nozzle are applied to study their effect on spray characteristics. Measurements of drop let mean diameter, droplet size distribution . droplet mean velocity, liquid volume flux and droplet number density have …

High Frequency Transformer Modeling Based On Time Domain Solution., Youssef Abed, Fathi Youssef, Brahim Metwally, Ahmed Saber

Mansoura Engineering Journal

A new model for the high frequency transformer simulation is presented in this paper. The power transformer, is vital and expensive pieces of the power system, should be studied and investigated for all possible operational stresses. To this extend, a wide range of frequency covering all possible transient conditions is to be investigated. In this work a new model, which enables the calculation of transformer transient voltage response is presented. The model is based on measurements in high frequency domain using low voltage high frequency generator. The introduced new model is simple to be programmed using available programs like, “MATLAB …

Assessing The Relationship Between Geophytes And The Archaeological Presence Of Maize In North America, Paige Dorsey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis investigates the possible relationship between the archaeological presence of maize, in the United States, and historical environmental variables, rainfall and temperature, in addition to the number of underground plants that store energy and nutrients, in a given area. The thought behind this is that where the abundance of these underground plant species is highest, the lower the number of archaeological sites containing maize because such resources were a more attractive alternative food than maize. Conversely, where geophytes are less abundant, archaeological instances of maize should be more abundant because maize is a better option in such environments for …

The Roles And Responsibilities Of The Covid-19 Elementary Principal In Relation To Job Descriptions And Utah School Leadership Evaluation Metrics: A Case Study, Sarah R. Nielsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to examine the roles and responsibilities of elementary school principals in relation to how they are evaluated and what is included in their job descriptions during the COVID-19 pandemic. Because of the numerous policies that surround education and the COVID-19 pandemic, this study examined elementary school principals from a single school district in Utah. Seven principals agreed to participate in an interview that asked principals about their day-to-day responsibilities as a principal and how COVID-19 affected those responsibilities. Six principals agreed to participate in a daily reflection on how much time they spent participating …

Impact Of Fish Oil On Intestinal Permeability, Inflammation, And Performance In Swine, Anthony Fernando Alberto

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Our research examined the effects of fish oil supplementation on intestinal permeability, systemic inflammation and performance in piglets. An lipopolysaccharide (LPS) challenge was done to stimulate the synthesis and release of the cytokines, in an effort to mimic the immune response that piglets would have when facing stress or pathogen challenge. Fish oil increased feed intake but did not affect growth when compared to control. Total fatty acid digestibility increased by 6% when fish oil was included in the diet. Also, we observed a 16% increase on 16-carbon fatty acids digestibility. Fish oil did not affect the plasma …

High-Magnification Digital Image Correlation Techniques For Aged Nuclear Fuel Cladding Testing, Robert Scott Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nuclear fuel cladding in light water reactors, often made of zirconium alloys, is naturally made more brittle by exposure to the water coolant during normal reactor operation. However, this embrittlement by zirconium hydrides changes the mechanical behavior of the cladding material, affecting how it will deform and what may cause it to fail. Because the cladding already has different properties in different material directions, mechanical testing also needs to be direction specific. In addition, to understand the effects that these microscale hydride features have, measurements of deforming cladding need to be at a microscale. This dissertation describes several high-magnification innovations …

Active Transportation Routes Using Canal Corridors: Decision Tools In Creating Successful Canal Trail Projects, Matthew Scott Crump

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The state of Utah has many canal corridors that offer potential opportunities for establishing public trails.In the past, concerns such as public safety and canal companies’ abilities to perform maintenance have inhibited the construction of canal trails. Recently, local governments and canal companies have worked to overcome these challenges which has led to the establishment of some canal trails. The purpose of this study is to provide valuable insights and tools that can be used in developing future canal trails. In order to accomplish this, the study documents various case studies of completed canal trail projects, interviews stakeholders for future …

Enzymatic Synthesis Of Maltodextrin Fatty Acid Esters And Their Emulsion Stabilizing And Microbial Inhibitory Properties, Namhyeon Park

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Food additives have been one of the traditional methods for preserving foods and are still in everyday use for multiple reasons. As the market size of processed foods grows, the use of food additives is increasing. Simultaneously, consumers try to avoid specific food additives or demand less processed foods because of several potential health concerns, suggesting the need for safe food additives.

In this environment, one group of food additives consisting of carbohydrates and fatty acids have received attention because of its nontoxicity and biodegradability with diverse functions. Notably, carbohydrate fatty acid compounds made of sucrose have been approved and …

Soil Health Monitoring And Management In Corn And Soybean Agroecosystems Of The Midwestern U.S., Bradley S. Crookston

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Soil health is a concept and condition of the soil where measurable soil properties represent the capacity of a soil fulfilling its intended use, such as producing crops, without constraint to its agro-ecological quality. Soil health assessments are used to estimate the health of a soil by assessing soil biological, chemical, and physical attributes, called soil health indicators, and scoring them on a scale, usually 0 to 100, to guide soil and crop management. However, there are few large-scale analyses of soil health assessment scores and their relationships with crop yield. Understanding how soil health assessments relate to crop yield …

An Investigation Into The Feasibility Of Streamlining Language Sample Analysis Through Computer-Automated Transcription And Scoring, Carly Fox

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of the study was to investigate the feasibility of streamlining the transcription and scoring portion of language sample analysis (LSA) through computer-automation. LSA is a gold-standard procedure for examining childrens’ language abilities that is underutilized by speech language pathologists due to its time-consuming nature. To decrease the time associated with the process, the accuracy of transcripts produced automatically with Google Cloud Speech and the accuracy of scores generated by a hard-coded scoring function called the Literate Language Use in Narrative Analysis (LLUNA) were evaluated. A collection of narrative transcripts and audio recordings of narrative samples were selected to …

Vte And Anticoagulation In Menstruating Women, Ida Micaily, Bethany T. Samuelson Bannow

Department of Medicine Faculty Papers

Women of childbearing potential have a high prevalence of venous thromboembolism (VTE) due to high estrogen states, such as pregnancy and the use of estrogen-containing contraceptives. Abnormal uterine bleeding (AUB) affects up to two-thirds of menstruating women on anticoagulation (AC), and can severely impair a woman's quality of life. Rates of heavy menstrual bleeding (HMB) and other forms of AUB including inter-menstrual and postmenopausal bleeding are consistently underreported in the original clinical trials utilizing AC. VTE can occur at any time in a woman's life, and the aim of this review article is to discuss the current landscape of literature …

Design Criteria Assessment For The Aeration Tank In The Activated Sludge Process., Ahmed Fadel, Tarek Abdel-Hamead

Mansoura Engineering Journal

In Egypt, the use of activated sludge process for treating domestic wastewater has been started recently. Several of activated sludge plants have been constructed in cities and villages. The kinetic coefficients used in sizing of the aeration tanks for these plants were taken the same as in the developed countries although the climatic conditions, load variation, presence of industrial wastewater and wastewater characteristics in Egypt differ than that in developed countries. A continuous flow activated sludge pilot plant was operated in El-Mansoura university sanitary engineering laboratory to determine the kinetic coefficients for El-Mansoura city and Meet-Mazah village wastewater. The results …