Digital Commons Network^™

An 8-Bit Dac Implementation Using Single Electron Tunneling ( Set ) Technology., Sameh Rehan, Lobna Osman

Mansoura Engineering Journal

An 8-bit digital-to-analog converter ( DAC ) based on the multiple-value k electron ( MVKe ) single electron circuit ( SEC ) is presented. With each MVke SEC, a variable number of electron k*e can be added one by one to an output node. Each MVke SEK, consists of two tunnel junctions and five capacitors. The proposed 8-bit DAC consists of eight MVke SEC blocks in addition to the charge reservoir load capacitor. It is implemented and simulated using SIMON 2.

On Line Threat Computation For Unmanned Air Vehicles., Jamal Azzam, Hassan El-Deip, Soliman Sharaf

Mansoura Engineering Journal

Unmanned Air Vehicles (UAVs) have potential strengths to be implemented in the battle fields. A major problem for UAVs is to plan an optimal trajectory path from its starting position to the target position in real time. For a path to be optimal it has to minimize: threat, path length, fuel consumption, flying time, and preserves dynamic constructs of the vehicle. The safety of the vehicle (i. e. minimizing the threats) has the first priority in the planning process. A major problem in this field is : how to compute the threats for a path on-line? A reliable solution for …

Study Of Parameters Affecting Thermal Drying Process., Mohamed Wasel, Hesham Mostafa, Gamal Sultan, A. Abd El-Badie

Mansoura Engineering Journal

Parameters affecting drying process has been studied experimentally as it associated with heat and mass transfer between porous bed to be dried and air which flows through the porous bed. To perform this study, a test rig is designed and constructed as it consists of vertical circular duct packed with wet porous bed which is made from clay balls of 20 mm in diameter. Drying process occurs as a result of forcing hot air vertically to pass through the wet porous bed, evaporation of moisture is existed in the bed due to the simultaneous heat and mass transfer. The studied …

A Composite Dynamic Rule For Machine Scheduling., Hassan Soltan

Mansoura Engineering Journal

This paper introduces a new rule for scheduling a single machine with weighted tardiness penalties. The design of this rule is based on experimenting two efficient dispatching rules, the ATC and COVERT rules, over a wide range of their free look-ahead parameter. The proposed rule is composite and dynamic in time. Further, it replaces the look-ahead parameter with a balancing parameter which can be fixed at a value of 0.5. The computational experiments exhibit the efficiency of the proposed rule and its availability for extension. Furthermore, it can be integrated as a complementary part or other scheduling approaches of simple …

Heat And Mass Transfer From Moist Air Flowing Inside Cold Horizontal Circular Duct I-Theoretical Study., Hesham Mostafa, Mohamed Saafan

Mansoura Engineering Journal

Heat and mass transfer from moist air flowing inside cold horizontal circular duct is investigated theoretically. In the present theoretical model, the flow of air inside the cold horizontal circular duct is assumed to be laminar and steady in cylindrical coordinates. The governing equations are the continuity, momentum, energy and concentration equations. These governing equations are put in the dimensionless form. By introducing new proper independent and dependent variables, the governing equations are transformed to a set of dimensionless differential equations. A computer program in FORTRAN language is developed to solve this set of equations to determine the distribution of …

Heat And Mass Transfer From Moist Air Flowing Inside Cold Horizontal Circular Duct Ii- Experimental Study., Hesham Mostafa, Mohamed Saafan

Mansoura Engineering Journal

Heat and mass transfer from moist air flowing inside cold horizontal circular duct is investigated, Experimentally. To perform the experimental study air tunnel is designed and manufactured. The cold horizontal circular duct (test section) is attached to the air tunnel. Moist air is drawn from the surroundings to flow inside the circular duct (250 mm in diameter and 1200 mm long). The evaporator for two separate refrigeration units is made from copper tubes. These copper tubes are warped in counter current around the outer surface of the duct to cool its surface, control and adjust the surface temperature of the …

Modelling Of Overhead Transmission Lines To Suppress Its Vibration Using Damper., T. Al-Faqi, A. Makadi, A. Al-Mesheal, F. Al-Fares

Mansoura Engineering Journal

A study of the sudden failure of conductors iv overhead transmission lines has been developed, using field data. It is found that the failure can be attributed to the excessive vibration of conductors under the stochastic wind excitation. By analyzing the field data, the maximum amplitude of vibration, and consequently the dynamic stress in the conductor, is calculated, and conductor’s life is estimated to be less than 20 years for several sites.In this work, mass-damper ”which acts as dynamic absorber” is introduced to reduce the vibration of overhead transmission lines, such that the sudden failure of the conductors can be …

A Discrete Multiphase Approach For The Infiltration Of A Nanofluid Around A Staggered Microfiber Matrix., Ahmed Elgafy

Mansoura Engineering Journal

In the present work a numerical study based on discrete multiphase approach, Lagrangian approach, is proposed to investigate and predict the trajectories of nanoparticles- filled fluid (nanofluid) infiltrated around a staggered microfiber matrix. The trajectory of the nanoparticle has been predicted by integration the force balance on it in a Lagrangian references frame during its motion through the fluid. The governing integral equations for the conservation of mass, momentum and energy have been solved in a segregated numerical fashion by a Control-Volume-Based Finite-Element Method. The nanoparticles trajectories and their interactions with fluid flow and microfiber walls have been predicted showing …

Modeling Cost Overrun In Construction Projects Case Based Reasoning Versus Regression Analysis., A. El-Kholy

Mansoura Engineering Journal

No abstract provided.

Enhancing Forced Convection Heat Transfer Annular Tubes By Using Aluminum Mesh Layers., Ahmed Ahmed Sultan, Gamal Sultan

Mansoura Engineering Journal

No abstract provided.

Extending Limits For Wave Power Absorption By Axisymmetric Devices, R. Porter, S. Zheng, D. Greaves

School of Engineering, Computing and Mathematics

No abstract provided.

Determination Of The Stress-Strain State Of Rock Mass And Zone Of Inelastic Deformation Around Underground Mine Excavation Using Modern Methods Of Numerical Modelling, Sergey A. Ignatiev, Aleksandr E. Sudarikov, Askar Zh. Imashev

Journal of Sustainable Mining

The paper reviews methods and trends of numerical modelling of geomechanical processes around underground mine excavations. The most rational method of determining the additional stresses caused by the mine excavations is chosen. Mathematical modelling was performed for excavations of various cross sections and different strength of rocks. The dimensions of the inelastic deformation zone around the mine excavations have been identified. The area of the total fracture zone around the excavation, as well as the area of the roof fracture zone are calculated. The results of the fracture zone modelling are presented both as coordinates and in a graphical form. …

Enhancing Mask Activity In Dopaminergic Neurons Extends Lifespan In Flies, Xiaolin Tian

School of Medicine Faculty Publications

Dopaminergic neurons (DANs) are essential modulators for brain functions involving memory formation, reward processing, and decision-making. Here I demonstrate a novel and important function of the DANs in regulating aging and longevity. Overexpressing the putative scaffolding protein Mask in two small groups of DANs in flies can significantly extend the lifespan in flies and sustain adult locomotor and fecundity at old ages. This Mask-induced beneficial effect requires dopaminergic transmission but cannot be recapitulated by elevating dopamine production alone in the DANs. Independent activation of Gαs in the same two groups of DANs via the drug-inducible DREADD system also extends fly …

Teaching Meiosis With The Dna Triangle Framework: A Classroom Activity That Changes How Students Think About Chromosomes, Leslie Kate Wright, Paulina Cortez, Margaret A. Franzen, Dina L. Newman

Articles

Many biology students struggle to learn about the process of meiosis and have particular difficulty understanding the molecular basis of crossing over and the importance of homologous pairing for proper segregation. To help students overcome these challenges, we designed an activity that uses a newly developed Chromosome Connections Kit® from 3-D Molecular Designs to allow learners to explore meiosis at the molecular level. We took a backwards design approach in constructing an effective classroom activity. We developed evidence-based learning objectives and designed a crossing over activity that targets students' misconceptions and key concepts about meiosis. Assessment questions were designed based …

Characterization Of Indoor Arenas Through An Anonymous Survey, Staci Mcgill, Morgan D. Hayes, Kimberly I. Tumlin, Robert Coleman

Biosystems and Agricultural Engineering Faculty Publications

Equine farms are building both stables for the horses to live in and additional facilities to train and work horses (Kidd et al., 1997). For many of these farms, an outdoor arena that has an all-weather footing is the first working facility built. During inclement weather the ability to train in the outdoor arenas is inhibited, which in turn means the trainers, riders, and farms lose income as money is only made when horses are working, training, and competing. Indoor arenas allow for horses to continue to be worked no matter the weather conditions. The equine industry contributes a total …

Fourth-Order Nonlinear Distortion To The Power Spectrum Of Rf Amplifiers, Xianzhen Yang, Shiyu Li, Fu Li

Electrical and Computer Engineering Faculty Publications and Presentations

Even-order intermodulation distortions are often considered easy to filter in narrowband radio frequency (RF) wireless systems because they are usually located far away from the desired passband and adjacent bands. However, even-order intermodulation distortions have recently attracted more interest with the increasing popularity of wideband RF appli- cations. The authors’ previous work was devoted to establishing the power spectrum model of second-order intermodulation distortion. Motivated by the latest efforts on RF power amplifier linearization with second-order and fourth-order intermodulation, our focus now is to establish a power spectrum model of fourth-order intermodulation distortion which can be used to discuss the …

A Reassessment Of The Potential For Loss-Framed Incentive Contracts To Increase Productivity: A Meta-Analysis And A Real-Effort Experiment, Paul J. Ferraro, J. Dustin Tracy

ESI Working Papers

Substantial productivity increases have been reported when incentives are framed as losses rather than gains. Loss-framed contracts have also been reported to be preferred by workers. The results from our meta-analysis and real-effort experiment challenge these claims. The meta-analysis' summary effect size of loss framing is a 0.16 SD increase in productivity. Whereas the summary effect size in laboratory experiments is a 0.33 SD, the summary effect size from field experiments is 0.02 SD. We detect evidence of publication biases among laboratory experiments. In a new laboratory experiment that addresses prior design weaknesses, we estimate an effect size of 0.12 …

An Evaluation Of The Main Factors Affecting Future Municipal Water Demand Forecasting In Kuwait., Falah Almottiri, Falah Wegian

Mansoura Engineering Journal

The scarcity of water is considered the most challenging problem that is facing the countries in the arid regions, in which Kuwait is a typical type of these countries. The future estimation of municipal water demand in such a country is a critical factor for water resources planning and development. This water demand forecasting is an essential for the determining of the type, size, location and timing of the required improvements and developments of water resources system. In this research the distinct features of main factors affecting Kuwait municipal water demand are discussed and analyzed thoroughly to find an appropriator …

Performance Of Multistage Detectors In Synchronous Cdma Mobile Communication System., Adel Sareh, Hisham Abdel-Ghaffar, Maurice El-Narekh

Mansoura Engineering Journal

Multiuser detection (MUD) is central to the fulfillment of the capabilities of Code-division-multiple access (COMA), which is becoming the ubiquitous air- interface in future generation communication system. The problem of multiple access interference (MAI) is vital for a CDMA system. A variety of MUD has been proposed to mitigate the MAI. The simplest one is the single-user matched filter approach, which totally ignores the existence of MAI. Its performance is not very satisfactory and is particularly limited by the near-far problem. This paper presents the performance of different types of detectors as Well as a solution for the near-far-problem using …

Thermal Effects On Propagation In Polymer Waveguides In Optical Interconnects., Atef Rashed

Mansoura Engineering Journal

Finite difference beam propagation modelling (FD-BPM) calculates the effect of thermal gradients in an optical backplane on the optical field propagation in a polymer multi mode linearly tapered waveguide. Compared to straight waveguides, tapered entrances offer improved power coupling for a wide range of optical source lateral offsets. Surface temperature gradients of 0.5 °C/µm across the taper were found to degrade this benefit due to the thermo-optic effect of the polymer. However, higher surface temperature gradients improve power coupling in two discrete ranges of lateral source offset.

Wavelet Processing In Optical Diffraction Grating., A. Samra, B. Yousif

Mansoura Engineering Journal

Accurate modeling of photonic devices is essential for the development of new higher performance optical components required by current and future wide bandwidth communication systems. The goal of this paper is to formulate a Wavelet-Galerkin method to solve a paraxial wave equation numerically. The numerical simulation is applied to a teal optical diffraction grating fabricated by a double-ion exchange technique. The Wavelet solutions have much better precision but are slightly slower than the finite difference solutions owing to the need to transform the samples from physical space into Wavelet space and back again. Although the Wavelet solutions require slightly more …

Citation Analysis Of Library And Information Science Doctoral Theses Awarded By Universities In India With Jabref Reference Management Software, Avinash Kumar Singh Mr., Vinit Kumar

Library Philosophy and Practice (e-journal)

ABSTRACT

Society's growth and progress are totally dependent on ongoing research. Citation analysis is one of the most common research methodologies used to assess the quality of research in any area of a topic. A bibliometric study would be helpful to all LIS members. To fulfil the study's goals, citation analysis techniques were utilized. The information was gathered from the Shodhganga repository, which is an online database of Indian theses. The Journal of the American Society for Information Science and Technology received the most citations. According to the research, it was ranked first out of 1929 national and worldwide referenced …

Organizing Committee: Reach To Space Conference On Space Commercialization: A Celebration Of 50 Years In Space, D. Flournoy

Online Journal of Space Communication

Michael Beavin, Department of Commerce

Robert Bell, SSPI

Tamara Bond, SSPI

David Bross, Hannover Fairs Corporartion

Dean Henry Burdg, Auburn University

David Cavossa, Arrowhead Global Solutions

Scott Chase, Access Intelligence

Leonard David, Space.com

Kenneth Davidian, NASA

Don Flournoy, Ohio University

Tara Giunta, Paul Hastings Janofsky & Walker LLC

Ray Hamilton, Auburn University

Douglas Heydon, Consultant

Susan Irwin, Irwin Communications

Hussein Jirdah, Universities Space Research Association

Randy Johnson, Auburn University

David Logsdon, US Chamber of Commerce, Space Enterprise Project

Andrea Maleter, Futron Corporation

Ted Mallory, Astar Air Cargo

Joseph Pelton, George Washington University

Art Poland, George Mason University

Lon Rains, Space …

Sponsors: Reach To Space Conference On Space Commercialization: A Celebration Of 50 Years In Space, D. Flournoy

Online Journal of Space Communication

Sponsors of the Reach to Space Conference on Space Commercialization: A Celebration of 50 Years in Space

Speaker Biographies: Reach To Space Conference On Space Commercialization: A Celebration Of 50 Years In Space, D. Flournoy

Online Journal of Space Communication

Speaker Biographies: Reach to Space Conference on Space Commercialization: A Celebration of 50 Years in Space

Edward D. Horowitz

Phillip Spector

John Mattingly

Robert Bell

Joseph N. Pelton

Courtney Stadd

Gregg Maryniak

J. Steven Newman

Lon Rains

Don M. Flournoy

John Ordway

Conference Program, D. Flournoy

Online Journal of Space Communication

CONFERENCE ON SPACE COMMERCIALIZATION

CELEBRATION OF 50 YEARS IN SPACE

AND LOOKING TO THE FUTURE

CONFERENCE PROGRAM

Monday, November 12, 2007

Stretching After An In-Water Warm-Up Does Not Acutely Improve Sprint Freestyle Swim Performance In Diii Collegiate Swimmers, Haven L. Westra, Alexander H.K. Montoye

Topics in Exercise Science and Kinesiology

Topics in Exercise Science and Kinesiology Volume 2: Issue 1, Article 11, 2021. Stretching, as part of a warm-up prior to competition, has been used as a method to enhance performance in swimming and other sports, but its efficacy as a potential ergogenic aid remains understudied. This study’s purpose was to determine if acute static stretching or a dynamic warm-up, following an in-water swim-specific warm-up, improved sprint freestyle swim performance in collegiate swimmers. NCAA Division III swimmers (n=15, 67% female) participated in three testing protocols. In each protocol, participants did an in-water warm up and either a dynamic warmup …

Dalit-Futurist Feminism: New Alliances Through Dalit Feminism And Indian Science Fiction, Priteegandha Naik

Journal of International Women's Studies

This article analyses the novel Generation 14 by Priya Sarukkai Chabria from a convergent perspective of Dalit Studies (which encapsulates Dalit literature and Dalit feminism) and science fiction. I suggest that Indian science fiction that discusses caste with reference to the emerging technoscientific culture can be termed Dalit-futurism. I define this concept by drawing on the tradition of Dalit literature and science fiction and suggest that the Dalit-futurist texts seek to mutate caste to foreground its arbitrary structure. This paper uses the vocabulary of science-fiction criticism to analyze the mutation of caste in the fictional world and draws parallels with …

Dalit Women In History: Struggles, Voices, And Counterpublics, Tarushikha Sarvesh, Rama Shanker Singh, Tehzeeb Alam

Journal of International Women's Studies

History is a projection of realities from the historian's lens and parameters. The popularity and acceptance of historical accounts depend much on hegemonic structures and knowledge. The Dalit community was marginalized within the Indian economic, social, and political historiography. Gradually, with the rise of Dalit consciousness, men—the better-positioned gender of the community—tried to express their vulnerabilities from a masculinist perspective. The literature written also projected women only as extensions of male protagonists. Though the traumas Dalit women have faced due to intersectional realities are separate from that of men, they could not find a place in early literature as complete …

Insidious Interlocking Of Gender And Caste: Consequences Of Challenging Endogamy, Mayurakshi Mitra

Journal of International Women's Studies

The Caste system in the Indian subcontinent is characterized by hierarchy or gradations according to occupational status. The evaluative standard that places a caste higher than others or lower compared to the rest is rooted in the Hindu Dharmashashtras. The high and the low are opposed to each other because of their associations with notions of purity and impurity in terms of the nature of their occupations. Since each caste is regarded as a closed group, special emphasis is placed on eating, physical contact, and marriage. Out of these three, the institution of marriage plays a significant role in the …