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. …

Mass And Heat Transfer Characteristics For Laminar Flow In A Sharp 180° Turn., M. Mohamed

Mansoura Engineering Journal

Numerical studies of laminar flow and heat transfer around a sharp 180° turn, of especial relevance to electronic systems, are made. Two-dimensional unsteady simulations are considered because of the high geometrical aspect ratios (AR > 5) occurring in the practical application. A high-order time-accurate finite volume scheme was used to solve unsteady incompressible Navier-Stokes and energy equations. Simulations are performed for 50 ≤ Re ≤1000. Predictions show that the sharp tum flow remains steady up to Re ≤ 600. In this steady regime, the re-attachment length increases gradually with the Reynolds number. However, a further increase in the Reynolds number gives …

Staged Combustion Of Rice Straw In A Fluidized Bed., Farouk Okasha

Mansoura Engineering Journal

Staged combustion of rice straw has been investigated using a fluidized bed combustor of 300 mm ID and 3300 mm height. With air staging, secondary air is fed higher up in the freeboard at 1500 mom above the distributor of primary air. Rice straw is fed as cylindrical pellets with 12 mm diameter and 10 mm length, The obtained results indicate that staged combustion is an effective way to reduce NOX emissions, in particular, at higher operating temperatures. NO, typically reduces by 50% when secondary air ratio becomes 30% at 850°C bed temperature. Staged operation has a slight, non-monotonic effect …

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. …

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.

Сharacteristics Mineral Resource Base Of Madagascar, A. E. Vorobyev, K. A. Vorobyov, S.A. Ndriambanuna, L.E. Schesnyak

Gorniy vestnik Uzbekistana

The main characteristics of the mineral resource base of Madagascar with details of coal, iron ore, non-ferrous metals, uranium, rare metals and gold are considered. In the gold-ore mineral base of Madagascar, coastal placers are of particular potential interest. Foreign mining companies and local crafts are described. The transition to the development of coastal gold placers is proposed

Study Of The Change In The Concentration Of Metal Ions In Bacterial Oxidation Of Floto Concentrate In The Liquid Phase, K. Sanakulov, B.F. Muhiddinov, S.Sh. Sharipov, A.T. Umrzakov

Gorniy vestnik Uzbekistana

The article presents the results of a study of the qualitative and quantitative analysis of metal ions in the bacterial oxidation of flotation concentrate in the liquid phase by mass spectroscopy. Changes in the concentration of metal ions (Na, Si, K, Ca, Fe, etc.) and ions of noble metals (gold, silver) in the process of bacterial oxidation of flotation concentrate were determined and changes in their concentration in the process were substantiated

Improving The Quality Of Cathodic Precipitation Coming To The Gmz-2 Of The State Enterprise "Navoi Mmc", Adizov L.A., Sh.R. Kodirov, Tazhibaev D.Yu., Ergashev N.U.

Gorniy vestnik Uzbekistana

In this article, the object of research was the cathode precipitation of GMZ-4, obtained by electrolytic precipitation of rich gold-containing solutions after intensive leaching of gravioconcentrates. As a result of the conducted research, to improve the quality of cathode precipitation in the conditions of GMZ-2, the optimal method of nitric acid treatment was chosen. This method is implemented on an industrial scale in the shop of finished products and is used when cathode precipitation is below the required quality

Innovative Centrifugal Concentrator Bowl From Sepro Mineral Systems, Van Kleek Mark, A. Pariy, M. Grodowski

Gorniy vestnik Uzbekistana

Modern centrifugal concentrators have become standard equipment for most precious metal extraction technologies due to their simplicity, cost-effectiveness and efficiency. However, as with any other technology, there is always room for improvement. Sepro Mineral Systems, Canada's largest supplier of mineral processing equipment, has developed a new Frontier centrifugal concentrator bowl (patent pending), which will soon be installed on all Falcon gravity concentrators, and will also be able to serve as a replacement part for most Knelson concentrator models.

Schemes Of Fast Automatic Input Of The Reserve For Electricity Systems With High-Voltagemi Asynchronny Electric Motors, Kholboev G.O., Aliyor Hamidov, Ataullaev A.O., Rasulova B.I.

Gorniy vestnik Uzbekistana

The main purpose of developing a fast-acting automatic reserve inclusion system is to reduce the impact of transition processes, mechanical impacts on engines and current throws while maintaining uninterrupted power supply to the engines at a time when power is disrupted from one of the power sources and the load is switched to the second source.

Problems Of Digital Transformation Of Industrial Facilities On The Example Of Hydrometallurgical Plant № 2 Of The Central Mining Department Of “Nmmc”, O.M. Mustakimov, Saliev H. A.

Gorniy vestnik Uzbekistana

The article discusses trends in the implementation of information and communication technologies in economy, social sphere and system of governance of the Republic, features of Strategy of scientific and technological development - "Digital Uzbekistan - 2030", the digital transformation of industrial facilities on the example of a Hydrometallurgical plant №2 of Central Mining administration of the State enterprise "Navoi mining and metallurgical combine", the prospects for the introduction of the concept of industry 4.0 in production

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

ETSU Commencement Ceremonies and Programs

No abstract provided.

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) …

The Clean Air Act: How It Can Be Localized To Promote Both Environmental And Social Justice, Tate Kirk

Seattle Journal of Technology, Environmental, & Innovation Law

Legislators attempt to achieve intended goals by enacting laws that provide for regulatory enforcement. However, many times laws are unable to achieve their stated goals and in some ways may create new or exacerbate existing issues. Luckily, upon review, many of these issues can be fixed with quick modifications to either their implementation or enforcement mechanisms. In its current form, the Clean Air Act does not effectively account for differences in regional climate patterns, and, moreover, it perpetuates environmental injustice. If local governments were given more autonomy to enforce the Clean Air Act, they could shape its enforcement to more …

Sink Hollow Volume 10

Sink Hollow

This year felt like a thunderstorm. Rain pelting down on us so hard it burns. Lightning strikes so stark we have to close our eyes. Thunder rumbling so ominously we feel it deep in our bones. So many things we hold dear have been lost in this storm.

But something we have found is the human ability to feel a raw and powerful pain. We are intrinsically bound to each other, to nature, and to this world by the pain we feel. A pain so powerful and deep you feel it is sucking you under and drowning you.

The pieces …

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.

Analysing The Traffic Movement Along The Main Roads In Makkah (Study Case Umm Al-Qura Road)., Mohammed Badabaan

Mansoura Engineering Journal

The city of Makkah receives a large number of vehicles belonging to the visitors and people performing Umrah especially during the period of Ramadan and Hajj. About 70% of these vehicles come along Makkah-Jeddah highway, one of the main entrances to Makkah, that linked with Umm Al-Qura road which leads directly to Al-Haram area. The aim of this study is to improve and ease the traffic movement and enhance the level of traffic safety along Umm Al-Qura road. This has been conducted by studying the engineering characteristics of umm Al-Qura road and its main intersections, studying the existing traffic condition …

Dispersion Effect On The Performance Of Fo-Cdma Passive Correlator Receiver., Kamel Hassan, Atef Ghuniem, Asmaa Abd Elftah

Mansoura Engineering Journal

In this paper the effect of chromatic dispersion on the performance of fiber optic-code-division-multiple-access (FO-CDMA) passive correlator receiver has been investigated. Optical orthogonal codes (OOCs) are utilized as signature sequences. The major noise sources (quantum shot noise, dark current noise, and Gaussian circuit noise)has been taken into consideration. We have derived an approximate analytical expression for the bit error rate (BER) of the system. BER analysis of the system is performed in the case of three different fiber types which are 1) a standard single mode fiber (SMF), 2) a dispersion shifted fiber (DSF), and 3) a fully dispersion compensated …

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 …

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 …

In Pursuit Of Diversity In The Cuny Library Profession: An Effective Approach To Leadership In Academic Libraries, Nilda Alexandra Sanchez-Rodriguez

Publications and Research

Maximizing the current organizational culture and diversity/inclusion practices within CUNY libraries is crucial to retaining highly talented support staff with significant potential for future leadership roles. This research explores equity, diversity, and inclusion within the library profession, with the intention of implementing strategic frameworks to attract, recruit, and retain underrepresented groups within the University. To spotlight areas of upward mobility within CUNY academic libraries, a CUNY-wide Library Workplace Climate survey on the perceptions of diversity, universal inclusion, and career progression was conducted. The scope of the survey study compares the different perspectives of CUNY librarians, full-time library classified paraprofessionals, and …

When Duty Calls. A Faith & Health Collaborative Response To Covid 19 And Social Justice: A Commentary, Joe Bohn, Karen Liller

Florida Public Health Review

We provide information pertaining to an interdisciplinary collaboration in West Central Florida that launched a faith & wellness teleconference intervention in March 2020 in response to the COVID-19 crisis. The collaborative partners engaged from across the 4-county region upon community lockdowns in response to the COVID-19 crisis and later addressing calls for social justice due to the deaths of George Floyd and other African Americans. For 17-weeks Christian and Muslim faith leaders provided live messages of hope along with community partners providing wellness (mental health and wellbeing) focused strategies for coping with the crisis. Thematic analysis of anecdoctal comments revealed …

Copper Electrodeposition In Full Wafer Thickness Through-Silicon Vias, Rebecca P. Schmitt

Chemical and Biological Engineering ETDs

Through-silicon vias (TSVs) are a key interconnect technology for advanced packaging of microelectronic devices, and full wafer thickness TSVs are required for certain microelectromechanical systems (MEMS) applications. In this work, electrolytes containing copper sulfate, an acid, chloride, and Tetronic 701 suppressor were implemented for Cu filling of high aspect ratio (10:1), full wafer thickness TSVs. For each electrolyte system, rotating disk electrode voltammetry was used to identify a voltage range for bottom-up Cu filling in the TSVs. Die level feature filling was performed using voltage ramping, which moved active deposition through the vias to yield void-free Cu features. During voltage-controlled …

Ensuring Justice For All, Jonathan Scott

University of Mississippi News

UM Class of '47 alumna creates fund to assist law students so they can assist others

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

Computer Information Technology 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 …