Digital Commons Network^™

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 …

Thermal Performance Of Loop Thermosyphon Charged By Nanofluid For Cooling Electronic Component., Mohamed Saafan, Hamed Eltahan, Roaya Jaleel

Mansoura Engineering Journal

This work presents a theoretical and experimental investigation on the thermal performance of thermosyphon for cooling high heat flux. The working fluid charged in the evaporator is pure water or Nano fluid (Al2O3+water). In theoretical model, the flow is described by continuity, momentum and energy equations. The flow is assumed laminar, steady and two dimensional with constant properties. The differential forms of governing equations are, numerically, solved using finite difference technique. According to this technique, the partial differentials are transformed to set of linear algebraic equations. These equations are solved, numerically, by Gauss-Siedel iterative method. an experimental set up is …

Tool Wear And Surface Roughness In Hard Turning Of Stainless Steel 316 Using Tungsten Carbide Tool., Ali Abdelaziz, Ahmed Elkaseer, Ahmed Nassef

Mansoura Engineering Journal

The aim of the present study was to investigate tool wear and surface roughness generation in precision hard turning of stainless steel 316 using tungsten carbide tool. A set of turning tests were carried out under a range of cutting parameters with carbide insert tools. The data obtained from these experiments helped in analyzing and understanding the tool wear phenomena and generated surface roughness during the cutting process. These results showed an inverse relationship between the feed rate and the exhibited flank wear and crater wear over the applied range of feed rate. However, multiple wear mechanisms revealed after the …

Influence Of Subgrade Stiffness On Flexible Pavement Responses – A Case Study-Alexandria City, Egypt., Saad El-Hamrawy, Ragaa Abd El-Hakim

Mansoura Engineering Journal

Alexandria city lies at the north of Egypt on the Mediterranean Sea. The top layers of soil in Alexandria differs from bed rock (Borg El-Arab), sand (near the sea, north Abo-Qir street) to silt and clay (Elsyouf, Smouha, Khorshed, etc..). Thus, a great attention should be considered in the design of pavements on these dissimilar subgrades because the performance of a pavement depends on the quality of its subgrade and subbase layers. The non-linear finite element program MICHPAVE is used in this study to analyze the flexible pavement responses. Displacements, stresses and strains are computed only within the region modeled …

Influence Of Unbound Materials Input Level On Pavement Performance Using Mepdg., Ragaa Abd El-Hakim, Sherif El-Badawy, Alaa Gabr, Abd El Halim Azzam

Mansoura Engineering Journal

For material characterization, the new Mechanistic Empirical Pavement Design Guide (MEPDG) has 3 input levels. Level 1 input values must be obtained through direct laboratory testing. Level 2 inputs are determined by the application of correlations with other material properties. Finally, Level 3 inputs are simply typical default values. The level chosen for each design input parameter, however, may have a significant effect on project design, costs, and reliability. In this paper, the influence of the unbound granular base material characterization input level on pavement performance as predicted by MEPDG for a typical flexible pavement section was investigated. For this …

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 …

Hardness And Wear Of As–Cast Mg–Al Based Alloy With Alumina Addition., Hesham Elzanaty, Nagwa Elhamshary

Mansoura Engineering Journal

Magnesium alloys have extensive application in industries. The range of physical properties that can be imparted to them is remarkable. Magnesium–Aluminium binary alloys generally possess good castability and good mechanical properties. The objective of the present investigation is to study the effect of varying weight percentage of alumina (Al2O3) on the hardness and wear resistance of the Mg–Al alloy. The addition of alumina resulted in a considerable increase in the Vicker's microhardness number and wear resistance of the original alloy. Wear resistance and Vicker's microhardness number increase with the increasing proportion of alumina powder addition because of the deposition of …

Pesticides Removal From Wastewater By Electrocoagulation Technique Using Stainless Steel (Ss-Ss) Plate Electrodes., Olfat Fadali, E. Ibrahim, T. Farrag, Ahmed Abdelbasier

Mansoura Engineering Journal

Today hazardous waste management has become one of the most challenging tasks to this technological world because tons of organic pollutants including various carcinogens are being exposed without the sufficient treatment. Electrocoagulation (EC) due to some advantages over chemical coagulation is becoming a popular process to be used for treatment of organic pollutants especially when pollutants are toxic. The aim of this work is to investigate the effect of current density, reaction time, initial concentration, addition of sodium chloride and magnetic field intensity oriented in two different directions on both removal efficiency of methomyl and the energy consumption. Current density …

An Evaluation Of A School District’S Mental Health Services Program Designed To Ensure A Safe And Positive Learning Environment For All, Jasodra Suba

Dissertations

A key component to academic success is comprehensive mental health services for students. The intended purpose of this evaluation was to study the implementation of strength-based performance standards in one school district’s mental health training for all individuals preparing to work in a school-based environment. The context of my program evaluation was one large public school district in the United States operating in a state that mandates that each public school district implement a mental health services program. As part of this study, I examined the underlying concerns surrounding the large public school district’s implementation of evidence-based Mental Health Assistance …

The Impact Of A K-8 Stem Program On Grades And Student Choice Of Stem And Advanced Mathematics And Science Coursework In High School, Astrid Rodrigues

Dissertations

The demands of today’s workforce call for schools to prepare their students to have problem-solving skills and be critical thinkers and collaborative colleagues. Science, Technology, Engineering, and Mathematics (STEM) learning has been known to cultivate, excite, and promote critical thinking and problem-solving skills in students from an early age.

This study explored the high school course selection of students who had participated in a compulsory Kindergarten to 8^th grade (K-8) STEM program, called Project Lead the Way (PLTW), while in middle school. Specifically, the study compared the number of STEM and advanced mathematics and science courses that students who …

Database, Registries And Monitoring Of Congenital And Genetic Malformation., Mohamed Ahmed, Nadia Hegazi, Samia El-Temtamy, Ehab Aboul-Ezz, Najwa Abd El-Megid, Ali El-Hazmi

Mansoura Engineering Journal

With technical and industrial advances which have become a significant part of today's economic growth, remarkable advances have been made in the development and use of technical capabilities that enhance the endeavor of the medical profession. The developed countries have adopted the essential ''corner stone'' of database and registries development for monitoring birth defects. The use of National and Regional Registries has become ''a must'' to have a database that is necessary for rehabilitation, control and prevention programs. In Saudi Arabia, towards this objective, a study to establish a database and national registry to monitor birth defects and determine frequency, …

Quantitative Inference Of Decision Making Strategies Under Inherent Knowledge Uncertainties., Shawkat Guirguis, Mohamed El-Raey, Essam Aly

Mansoura Engineering Journal

In this paper a model and its associated software system, that is being used for designation of optimal strategies are presented. Obtained optimal strategies are employed by decision markers to safety react to various conditions. The fact that decision markers are expected to take actions according to given observations is discussed along with emphasizing the relationships between these observations and the underlying states of nature that caused them. This is a many-to-many relation and care must be taken to avoid unreliable of the real cause or causes a observed situation. The inherent uncertainties in the assessment process have been identified …

The Effect Of Vehicle Suspension System Components On The Ride Comfort Due To Road Roughness., Ashraf Shaaban, Yousef Abo-Mossalam, Kamal Abed, Nihad El-Chazly

Mansoura Engineering Journal

The aim of the present work is to investigate theoretically the vibration characteristics of the driver body components due to road surface irregularities, when changing the characteristics of suspension system components, A mathematical model representing the vehicle and the driver, and contains five degrees of freedom, has been built-up and analyzed. A computer program has been written based on the transfer matrices concept, and used in the frequency range up to 15 Hz, Finally, this work is considered a step towards obtaining useful technical protection data against vibration. The results indicate that the vibration characteristics of the driver body (ride …

China Maritime Report No. 17: The Pla Army's New Helicopters: An "Easy Button" For Crossing The Taiwan Strait?, Tom Fox

CMSI China Maritime Reports

This report examines the potential roles and missions of the People’s Liberation Army’s (PLA) new rotary wing capabilities in a cross-strait invasion. Looking specifically at the helicopter units of the PLA Army (PLAA), it discusses two possible scenarios in which these forces could serve as the main thrust in a campaign to seize control of Taiwan. In the first scenario, the PLAA would use nearly all of its rotary wing inventory simultaneously to overwhelm Taiwan’s defenses and quickly convince the country’s political leadership to surrender. In a second “unconventional” scenario, the PLAA would risk the destruction of older helicopters in …

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.

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 …

Forced Convective Laminar Flow In Elliptic Pipes Of Different Aspect Ratios., Mohamed Mahgoub, Mohamed Wasel, A. Kamel, Mohamed Mousa

Mansoura Engineering Journal

The present analysis investigates non-Darcy forced convective heat transfer in a cylindrical pipe filled with spherical beads saturated with non-Newtonian drag reducing fluid. The cylindrical pipe is subjected to either a uniform heat flux (UHF) or a constant wall temperature (CWT). In modeling the flow, both the energy equation and a modified momentum (Darcy-Forschheimer-Brinkman) equation are used , in which the variable porosity, flow inertia, Brinkman viscous friction (non-Darcian effects) besides the elongational viscosity of drag reducing fluids are taken into consideration and the finite difference technique is used. The results are obtained for a non-Newtonian drag parameter range of …

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 …

Fractional Factorial Treatment Of Ring Spun Yarn Quality., Fawkia El-Habiby, Rizk El-Bealy

Mansoura Engineering Journal

In the present work a study was made about the effect of the following five Parameters yarn linear density , spindle speed, /traveller size, top roller pressure and cradle opening on the quality of ring spun yarn. The experiments were carried out by varying each parameter at two levels using the fractional factorial technique (9). The experimental design treatment with the help of mini-computer programming was used to determine the effect of mean parameters and two factor interactions and interactions between two parameters were carried out by the method of variance analysis.

Raman Spectroscopy For Forensic Identification Of Body Fluid Traces: Method Validation For Potential False Negatives Caused By Blood-Affecting Diseases, Niara Nichols

Chemistry

Two critical issues in forensic science are identifying body fluid traces found at crime scenes and preserving them for DNA analysis. However, the majority of current biochemical tests for body fluid identification, which are applicable at the crime scene, are presumptive and destructive to the sample. Raman Spectroscopy provides a suitable alternative to current methods as a nondestructive, confirmatory, and potentially in field method. Our laboratory has developed a chemometric model for the identification of five main body fluids using Raman spectroscopy. This model was developed using samples obtained from healthy donors. Thus, it is of most importance for the …

Leadership Influence On Collective Teacher Efficacy In Multi-Cultural Teams: A Mixed-Methods Study, Yaru Zhou

Education Dissertations

As evidence for positive effects of collective teacher efficacy on student performance and teacher well-being grow, increasing efforts have been made worldwide to understand how teachers’ beliefs in the team’s capacity form in schools. This study adopts a mixed-methods approach; 90 teachers from seven international schools in China participated in the survey, and eight teachers from these schools joined focus group interviews. This paper seeks to understand the relationship between teachers’ perceptions of instructional school leadership and collective efficacy, and how individual leaders’ character strength of encouragement and structural factors, including school levels and cultural dimensions, affect the relationship. Quantitative …

Lxr Acts As A Differentiator In The Regulation Of Fas And G6pdh Gene Expression Under Insulin Resistant Conditions, Jaafar Hachem

Dissertations

Diabetes is a chronic disease that effects 10 percent of the world’s population and causes more than 1.5 million deaths a year and billions of dollars in associated health care cost. It can lead to very serious complications such as renal failure, liver cirrhosis, heart attack, and vision loss. The most common type of diabetes is type 2 diabetes. Type 2 diabetes arises when blood glucose levels remain chronically high due to insulin resistance. The reason for this elevation is due to the failure of insulin to allow tissues to uptake glucose causing problems in subsequent metabolic pathways. Over the …

Hdsl: A Hybrid Distributed Single-Packet Low-Storage Ip Traceback Framework., Magdy M. Fadel

Mansoura Engineering Journal

Many problems with IP protocol design facilitate the mission of the Distributed Denial of Service (DDoS) attackers. This paper proposes a new Hybrid Distributed Single-packet Low-storage (HDSL) IP traceback framework, which consists of three enhanced DDoS defense mechanisms. The first mechanism is a Deterministic Packet Marking (DPM) to compose a unique path identifier for validating network paths. The second is a low-storage space packet logging to locally log routed packets information which is used later for locating the source of even a single attacking packet. The third, pushes the aggregates of the attacking packets upstream one or more levels to …

Yield Line Versus Finite Element Analyses Of Beamless Slabs., Hassan Hosny, Aly Abdel Rahman

Mansoura Engineering Journal

No abstract provided.

Nurses’ Perceptions Of Factors Influencing Treatment Engagement Among Patients With Cardiovascular Diseases: A Systematic Review, Amineh Rashidi, Lisa Whitehead, Prachi Kaistha

Research outputs 2014 to 2021

Background:

Nurses are key to the success of patient engagement, yet we know little about nurses’ perceptions on treatment engagement and how they can contribute to treatment engagement. Qualitative evidence to identify factors that influence treatment engagement among patients with CVD from nurse’s perspective is limited.

Methods:

This systematic review of qualitative research was based on the PRISMA reporting guidelines. The Joanna Briggs Institute (JBI) Critical Appraisal Checklist was used to assess quality by two reviewers independently. Data were collected from Medline, Web of Science, CINAHL, PsychINFO, Embase- Non-Medline, Scopus, and the Cochrane Library, were systematically searched from 2001 to …

Genotype-Specific Lesion Growth Rates In Stargardt Disease, Rachael C. Heath Jeffery, Jennifer A. Thompson, Johnny Lo, Tina M. Lamey, Terri L. Mclaren, Ian L. Mcallister, Ian J. Constable, John N. De Roach, Fred K. Chen

Research outputs 2014 to 2021

Reported growth rates (GR) of atrophic lesions in Stargardt disease (STGD1) vary widely. In the present study, we report the longitudinal natural history of patients with confirmed bial-lelic ABCA4 mutations from five genotype groups: c.6079C > T, c.[2588G > C;5603A > T], c.3113C > T, c.5882G > A and c.5603A > T. Fundus autofluorescence (AF) 30◦ × 30◦ images were manually seg-mented for boundaries of definitely decreased autofluorescence (DDAF). The primary outcome was the effective radius GR across five genotype groups. The age of DDAF formation in each eye was calculated using the x-intercept of the DDAF effective radius against age. Discordance between age at DDAF …

“Coronavirus Changed The Rules On Everything”: Parent Perspectives On How The Covid‐19 Pandemic Influenced Family Routines, Relationships And Technology Use In Families With Infants, Rebecca Hood, Juliana Zabatiero, Desiree Silva, Stephen R. Zubrick, Leon Straker

Research outputs 2014 to 2021

This study explores how the first wave of the COVID‐19 pandemic influenced family routines, relationships and technology use (smartphones and tablet computers) among families with infants. Infancy is known to be an important period for attachment security and future child development, and a time of being susceptible to changes within and outside of the family unit. A qualitative design using convenience sampling was employed. A total of 30 mothers in Perth, Western Australia participated in semi‐structured interviews by audio or video call. All mothers were parents of infants aged 9 to 15 months old. Interviews were audio‐recorded and transcribed, and …

Influence Of Physical And Technical Aspects On Change Of Direction Performance Of Rugby Players: An Exploratory Study, Tomás T. Freitas, Pedro E. Alcaraz, Julio Calleja-González, Ademir F. S. Arruda, Aristide Guerriero, Valter P. Mercer, Lucas A. Pereira, Felipe P. Carpes, Michael R. Mcguigan, Irineu Loturco

Research outputs 2014 to 2021

We examined the relationships between change of direction (COD) speed and deficit, and a series of speed-and power-related measurements in national team rugby union players and analyzed the influence of movement patterns on COD ability. Eleven male athletes completed the following physical assessments on different days: day 1—anthropometric measurements, and lower-body kinematic parameters (assessed with eight inertial sensors) and completion time in COD tests (proagility, 45◦ cutting maneuver (CUT), and “L” (L-Drill)); day 2—bilateral and unilateral squat and countermovement jumps, 40 m linear sprint, and bar-power output in the jump squat and half-squat exercises. Pearson’s product–moment correlations were performed to …