Digital Commons Network^™

Enhancing Air Side Heat Transfer Coefficient Of Flat Tube Air Cooled Condensers., Mohamed Mahmoud Awad, Hesham Mostafa, Gamal Sultan, A. Elbooz, A. El-Ghonemy

Mansoura Engineering Journal

Forced convection heat transfer for air side over aluminum extruded micro-channel fat tubes, which used in air cooled condensers, was studied theoretically. Mathematical modeling of air flow outside the aluminum flat tubes were carried out to study the proposed inclination angles and evaluate the thermal performance for different operating parameters. A computational fluid dynamic software (CFD) is used to solve this problem. Two proposed cases for inclination of the flat tubes are studied. The first case is to make convergent and divergent channels for air Now, while the second case is tilting of all tubes in parallel to each other. …

Citation Analysis Of Doctoral Theses In Library And Information Science Submitted To Manipur University During 1989-2017, Jaba Moni Das, Dr. Dipen Deka Assistant Professor

Library Philosophy and Practice (e-journal)

Abstract

The present study applies the citation analysis method to analyze Library and Information Science (LIS) doctoral theses submitted to Manipur University during 1989-2017. A total of 2,725 citations appended to 27 LIS doctoral theses examined for bibliographic forms, authorship pattern, and their collaboration level, chronological-wise distribution, the applicability of Bradford's law, rank-wise list, core journal list, country-wise list. The study finds that journals are the most cited resources, followed by books. Single-authored works are found dominant in both journal and book citations. The country-wise distribution of journals reveals that 412 citations (38.52%) were from India, followed by the UK …

A Citation Analysis Of Chemistry Publications By Faculty Members And Research Scholars At University Of Mysore And Karnatak University, Kodandarama ., Chandrashekara M

Library Philosophy and Practice (e-journal)

Purpose-The study aims to analyse the resources used in the citations of 1355 research publications of University of Mysore and Karnatak University in the field of chemistry and prepares the core journal list and prolific authors. For any research and academic institutional libraries, books and journals are considered as key resources. As the resources are more and diverse, collection building is a tough task for librarians. Citation analysis is one of the best methods to list the most used resources by the users. Hence, the paper highlights the extent of use of different sources in the research publications of chemistry. …

Paddock To Paddock Pasture Yield Variation On Dairy Farms In The Waikato Region Of New Zealand, Alvaro J. Romera, C. E. F. Clark

IGC Proceedings (1977-2023)

No abstract provided.

In‐Herd Diversity Of Lifetime Performances: A Key For The Sustainability Of Livestock Farming System Based On Grassland, Laurence Puillet, D. Sauvant, M. Tichit

IGC Proceedings (1977-2023)

No abstract provided.

The Feeding Scheme Of Extensive Animal Production Systems In Montado, José Mira Potes

IGC Proceedings (1977-2023)

No abstract provided.

Rheological Effect During Swelling Of Polymer Membranes In Aqueous Solutions With Different Dithyremic Content, Yulchi T. Juraev, Leonard M. Sabirov, Nikolay F. Bunkin, Valeriy A. Kozlov

Scientific Journal of Samarkand University

It was shown that the swelling of the initially hydrophobic Nafion plate in ordinary water (157 ppm deuterium content) and in deuterium-depleted water (1 ppm deuterium content) in a limited volume cell occurs differently. It turned out that small changes in the deuterium content in water lead to significant differences in the dynamics of swelling of the polymer membrane. For a 175-micron thick Nafion plate, this effect is most pronounced when the distance between the windows is L = 200 microns.

A Numerical Solution Of The Problem Of Solute Transport In A Two-Dimensional Nonhomogeneous Porous Medium, B. X. Xujayorov Prof., Azizbek Usmonov, Zoxidjon Qaytarov

Scientific Journal of Samarkand University

The problem of solute transport in a two-dimensional nonhomogeneous porous medium is posted and numerically solved. The filtration velocity and hydrodynamic dispersion were set by various relations, nonlinear and sinusoidal. Based on the numerical results, the concentration fields are determined for different values of the initial data and different relations of the filtration velocity and hydrodynamic dispersion.

A Criterion For The Solvability Of The Cauchy Problem For The System Of Thermoelasticity Equations, Iqbol Niyozov, Olimjan Maxmudov

Scientific Journal of Samarkand University

In this paper, we considered the problem of analytical continuation of the solution of the system equations of the thermoelasticity in bounded domain from its values and values of its strains on part of the boundary of this domain, i.e., the Cauchy’s problem and we give a criterion for the solvability of the Cauchy problem.

Raman Scattering Spectra Of Α-Alanine Molecular Complexes, Hakim Hushvaktov

Scientific Journal of Samarkand University

The article presents the results of studying the complexity of the Raman spectra of a-alanine in the crystalline state. It has been shown by ab initio calculations that the change in the Raman spectra is explained by the formation of several types of hydrogen bonds. In Raman spectra, the presence of a hydrogen bond between molecules is manifested in the form of asymmetry and splitting of vibrational bands.

On Properties Of Some Singular Surfaces, Salim Usmanov

Scientific Journal of Samarkand University

В данной статье рассматриваются некоторые особые поверхности, задаваемые параметрическими уравнениями. Доказано, что хотя бы одна из главных кривизн не обращается в нуль в каждой регулярной точке этих поверхностей.

A Logical Method For Finding Maximum Compatible Subsystems Of Systems Of Boolean Equations, Anvar Kabulov, Erkin Urunbaev, Mansur Berdimurodov

Scientific Journal of Samarkand University

The problem of finding the maximum joint subsystem of Boolean equation systems is solved. An algorithm for finding the maximum upper zero of a monotone Boolean function is proposed. An efficient procedure for calculating the values of monotone functions on sets of a - dimensional cube is investigated and developed. An algorithm for solving systems of Boolean equations based on the search for the maximum upper zero of monotone functions of the logic algebra is developed.

Rapid Radiological Analysis Of Building Materials, Askar Safarov, Joseph Sharonov, Ali Mukhamedov, Askarali Azimov, Akmal Safarov, Mukhammad Salimov, B Radzhabboev

Scientific Journal of Samarkand University

Measurements of the dose-forming radionuclide concentrations such as Rа-226, Тh-232 and К-40 were carried out in samples of building materials with different ageing times. The radium equivalent activities of the samples were determined. Possible values of the correcting coefficients to the activity of Ra-226 that take into account the radioactive equilibrium were calculated. This, in turn, allows to perform rapid radiological analysis of building materials.

2020 Fall - Commencement Program, Office Of The Registrar, East Tennessee State University

ETSU Commencement Ceremonies and Programs

No abstract provided.

Mesh Networking And Security Applications In Lora Ad-Hoc Networks, Derek Heeger

Electrical and Computer Engineering ETDs

The Internet of Things (IoT) has rapidly expanded into consumer and industrial applications driving the need for secure and energy efficient communications suitable for battery powered devices. Common IoT protocols developed for these applications include SigFox, Narrow-Band IoT, and Long Range (LoRa). LoRa is an energy efficient long-range communication method enabled by advanced modulation schemes. This research enables new capabilities in LoRa ad-hoc networks allowing for innovative IoT sensors that were previously infeasible due to energy constraints. This is achieved by investigating adaptive data rate (ADR) techniques, enabling reliable and secure remote firmware updates, improving LoRa authentication, and implementing a …

Cognitive Radios For Self-Aware And Spectrum-Agile Communications Over Wideband Spectrum, Mohamed A. Aref

Electrical and Computer Engineering ETDs

In this dissertation, we introduce a novel cognitive engine design for intelligent, self-aware and spectrum-agile communications. The targeted cognitive radio (CR) has sensing and learning abilities that incorporate advanced signal processing and machine/deep learning (ML/DL) techniques. It can operate over a heterogeneous wideband spectrum that is much wider than the ones proposed in the literature, most likely covering several hundreds of MHz. It has the ability to detect existing signals in the surrounding RF environment and identify their origins. Furthermore, it cognitively uses channel selection, transmit power control and interference cancellation to adapt its communications mode in response to observed …

Using Eye-Gaze To Evaluate Neural Attention, Shahansha Salim

Master’s Dissertations

The ability to selectively concentrate on areas of interest while ignoring the rest is termed as attention in human beings. This ability has played a key role in survival as well as information processing. Neural Attention is said to be an effort to bring similar action of selectively concentrating areas of relevance in deep neural networks. This simple yet powerful concept has attracted a lot of research in recent years, yielding breakthrough results in Natural Language Processing (NLP) problems and main stream Computer Vision problems such as Image Caption Generation, Neural Machine Translation (NMT), Visual Question Answering (VQA), Action Recognition, …

Stirling Cycle Machine Analysis, Israel Urieli

OHIO Open Faculty Textbooks

Dedicated to William T. Beale (1928 - 2016), inventor of the Free Piston Stirling Engine, Mentor and Frien.

This web resource is intended to be totally self contained learning resource for the analysis and development of computer simulation of single phase, piston/cylinder Stirling cycle machines. It includes thermodynamic, heat transfer and fluid flow friction analysis, and until 2012 it was used as resource material for an advanced course for Mechanical Engineering majors. The course structure was based on the book by I.Urieli & D.M.Berchowitz 'Stirling Cycle Engine Analysis' (Adam Hilger, 1984). The computer simulation program modules (originally written in FORTRAN) …

Wildlife Trade And Covid-19: Towards A Criminology Of Anthropogenic Pathogen Spillover, Piers Beirne Phd

Department of Criminology

The general remit of this paper is the role of wildlife trade in pathogen spillover. Its underlying assumption is that, so far from being the exclusive domain of the life sciences, the study of pathogen spillover will be greatly enhanced by multi-perspectival approaches, including One Health and those employed here, namely, non-speciesist green criminology and critical animal studies. The paper moves from discussions of zoonosis, anthroponosis and wildlife trade to the emergence of COVID-19 in Wuhan, China. The paper recommends the abolition of all wildlife trade and the reclamation of wildlife habitat and broaches discussion of the extension of legal …

National Security And Climate Change, Madison Moran

Physics Capstone Projects

Certain scientific subjects are often divisive or technical, which makes those topics difficult to discuss with audiences outside the scientific sphere. One way of getting around this obstacle is to cater scientific communication to different target audiences to cut through any audience biases. In order to accomplish that, a communicator needs to understand the relationship between audiences’ worldviews, and what they know, feel, and do regarding the subject at hand, and then how that relationship influences the types of media audiences trust and to which they respond positively. The following study investigates the worldviews of a military audience with respect …

Winter Commencement, 2020, Marshall University

Marshall University Commencement

Program for the one hundred and eighty-third commencement at Marshall University.

A Case Study Regarding Induction Supports And Activities And Their Impact On Successful Teacher Retention, Alicia Ponds

Doctorate in Education

At the end of every school year, new teachers either stay or leave public classrooms. Multiple challenges drive these new teacher choices. State, district, and local administrators struggle to fill teacher vacancies. New teacher departures challenge schools with the maintenance of an attractive work environment and provision of quality student education. This case study shares how five successful Minnesota educators apply extrinsic activities and intrinsic supports to not only meet these challenges, but effectively respond to the 2019-2020 onset of the COVID-19 pandemic. Through research interviews, this qualitative study analyzes intrinsic supports and extrinsic activities in relation to positive teaching …

Numerical Evaluation Of Effective Thermal Response Of Heterogeneous Materials, Kevin W. Irick

Mechanical Engineering ETDs

Heterogeneity in materials leads to increased complication of physics, at the level or scale where heterogeneity exists, making analysis and material behavior predictions more difficult. As a result of the intricate descriptions or understanding of the physics required to determine the behavior of a heterogenous material or system, practitioners frequently prefer the use of effective properties or responses. This body of work is dedicated to performing computational analyses on the thermal behavior of heterogeneous materials and evaluating the corresponding analyses using formal verification approaches. Custom finite element method code was used for solving the heat equation in a variety of …

Solar Insolation Micro-Forecasts Using Longwave Infrared Sensors And Artificial Intelligence, Anthony R. Menicucci

Mechanical Engineering ETDs

Solar Insolation Micro-Forecasts (SIMF) are used by Independent Service Operators (ISOs) and other grid operators to maintain constant and stable electrical grid frequency, voltage, power factor and waveform across their transmission infrastructure. Intermittent, thick, dense and typically cumulus clouds negatively impact the electrical grid by quickly turning on and off power production from large solar photovoltaic (PV) fields, causing grid stability problems between generation and load. Forecasting insolation values over large PV fields allows operators the chance to anticipate and proactively implement mitigation strategies like engaging spinning reserve from gas turbines, deploying generators, buying power in the spot market, and …

The Impact Of Calendering On The Electronic Conductivity Heterogenity Of Lithium-Ion Electrode Films, Emilee Elizabeth Hunter

Theses and Dissertations

Advancements in Li-ion batteries are needed especially for the development of electric vehicles and stationary energy storage. Prior research has shown mesoscale variations in electrode electronic conductive properties, which can cause capacity loss and uneven electrochemical behavior of Li-ion batteries. A micro-four-line probe (μ4LP) was used to measure electronic conductivity and contact resistance over mm-length scales in that prior work. This work describes improvements to overcome the challenge of unreliable surface contact between theμ4LP and the sample. Ultimately a second generation flexible probe called the micro-radial-surface probe (μ4LP) was designed and produced. The test fixture was also optimized to obtain …

A Survey On Subsurface Signal Propagation, Usman Raza, Abdul Salam

Faculty Publications

Wireless Underground Communication (WUC) is an emerging field that is being developed continuously. It provides secure mechanism of deploying nodes underground which shields them from any outside temperament or harsh weather conditions. This paper works towards introducing WUC and give a detail overview of WUC. It discusses system architecture of WUC along with the anatomy of the underground sensor motes deployed in WUC systems. It also compares Over-the-Air and Underground and highlights the major differences between the both type of channels. Since, UG communication is an evolving field, this paper also presents the evolution of the field along with the …

Treatment Of Concentrated Black-Water And Kitchen Organic-Wastes In Accumulation System., Tarek Abdelhamid Attea

Mansoura Engineering Journal

The feasibility of two accumulation-systems (AC) (or anaerobic digestion and storage of concentrated black-water with (ACL) or without (AC2) urine + kitchen organic-wastes were investigated the wastewater was collected by two vacuum toilet transport system. The influent-total chemical oxygen demand (COD) of the AC2 system (54000 Mg/L) was more concentrated by than thus of the ACT system. The AC systems demonstrated stable performance. There was no inhibition effect of ammonium (NH4) and volatile fatty acids (VFA) concentration decreased in time, COD, removal of 58 % was achieved in both systems, after 105 days ill 20oC. Moreover, is the supernatant in …

Modeling Of Photovoltaic Systems Using Matlab., Saad Eskander

Mansoura Engineering Journal

This paper presents the modeling of photovoltaic power system elements. The solar cell is modeled mathematically for determining its electrical behavior. Current voltage and power voltage characteristics of each solar cell are determined by aiding of the model at different isolation levels. The solar cell model is then extended to obtain the module along with the array model. Experimental verification of the model indicates a good fitting of the model. The battery plays an important role in photovoltaic power system. Hence, the paper illustrates the modeling of one cell of a lead acid battery. The cell model is built up …

Petrology Of The Gradational Intrusive Contact Between The Packsaddle Schist And The Town Mountain Granite, Enchanted Rock State Natural Area, Llano Uplift, Central Texas, Travis Galle

Electronic Theses and Dissertations

The Mesoproterozoic intrusive contact between the ~1.1 Ga anorogenic Town Mountain Granite and the ~1.3 Ga Packsaddle Schist is a gradational contact exhumed within the Llano uplift. This contact is exposed along the southeastern margin of the Enchanted Rock batholith in central Texas. Field observations, hand sample and thin section petrography, and handheld X-ray fluorescence analysis of hand samples were used to characterize the gradational nature of this contact at multiple scales. The style of gradation between the Town Mountain Granite and Packsaddle Schist varies throughout the study area, containing both injection and permeation. The complex relationships observed at the …

Monitoring The Low Frequency Radio Transient Sky With The Long Wavelength Array, Savin Shynu Varghese

Physics & Astronomy ETDs

Transient searches in radio astronomy have discovered some of the most extreme astrophysical phenomena in our universe. This has enabled us to study the physics of these explosive and dynamic sources. Most of the transient searches over the past 70 years have been at frequencies higher than 100 MHz leaving the transient sky below 100 MHz unexplored. The Long Wavelength Array (LWA) telescope offers an excellent opportunity to study the transient sky below 100 MHz with its wide field of view, high sensitivity and fast imaging at shorter timescales. This dissertation presents the transient searches carried out using the all-sky …