Other Engineering Commons^™

The Development Of All Solid-State Optical Cryo-Cooler, Junwei Meng

Optical Science and Engineering ETDs

This dissertation describes the development of an all solid-state optical cryo-cooler. Crystals of 10% wt. ytterbium-doped yttrium lithium fluoride (Yb³⁺:YLF) are used to cool an infrared HgCdTe sensor payload to an absolute temperature below 135 K, equivalent to delta T equal 138 K below ambient. This record level of cooling is accomplished with a single stage, in a completely vibration-free environment, with a corresponding cooling power of 190 mW. This milestone is made possible by the design and fabrication of an undoped YLF thermal link that efficiently shields the payload with a non-right angle kink from intense anti-Stokes …

Geomechanical Features Of The State Of Mining Operations In The Development Of The Eastern Part Of The Charmitan Gold Deposit, Kalmykov V.N., Ravil Kulsaitov, Isfandiyor Sodikov, T.U. Khudoyarov

Gorniy vestnik Uzbekistana

Increasing the depth of mining operations at Charmitan vein Deposit complicates the geomechanical situation, which is expressed in an increase in the number of col- lapses of host rocks in the treatment space, where the workers of the treatment unit are located. The only way to normalize the geomechanical environment is to implement development systems with a bookmark of the developed space. In connection with the above, full-scale methods of measuring the stress state by the finite element method, modeling of the geomechanical situation were carried out. In the course of research, the parameters of force fields in natural and …

Researches In The Field Of Technology Of Extraction Concentration Of Rhenium From Desorbates, M.A. Kurbanov, Sh.Sh. Alikulov, D.S. Ganieva, N.M. Karimov

Gorniy vestnik Uzbekistana

New progressive methods include air-purged drilling. This method is fundamentally different from washing with a liquid in that a gaseous agent, in particular compressed air, is used to clean the bottom of the sludge. Drilling practice has proven that the use of compressed air as a cleaning agent provides a significant increase in the mechani- cal drilling speeds and reduces the time required to eliminate geological complications, due to which

Effect Of Gold Nanoparticle Parameters On Indicators Of Technology Of Its Extraction From Ores, A.E. Vorobev, T.V. Chekushina, К.А Vorobev, A.G. Oganesyan

Gorniy vestnik Uzbekistana

The authors proposed the isolation of a large piece from the conveyor belt with a layer of small particles of bulk cargo to reduce dynamic loads. They suggest installing a device for forced segregation of bulk cargo under a loaded belt. The authors developed a mathematical model for the behavior of a large piece on a conveyor belt.

Study Of Gold Ore Deposits Of Aristantau For Resilience And Search Technologies For Its Processing, Kuvandik Sanakulov, Omon Fuzaylov, J.A. Kenbaeva

Gorniy vestnik Uzbekistana

The article presents the results of research of chemical, material, mineralogical and rational analyses of persistent gold-bearing ore of The aristantau Deposit. The re- sults of experiments indicated the content of sulfide sulfur, organic carbon, arsenic and antimony. As a result, the technological scheme included operations for oxidative firing of the flotation concentrate. Various forms of fine-grained gold were found in pyrite, arsenopyrite, and sphalerite.

The Role Of Chinese Mining Industry In Domestic And Global Economy, Suen Li Chan, Djulibekov M.K.

Gorniy vestnik Uzbekistana

The article describes the impact of the Chinese gold industry on the world gold market and the economic growth of China for the period 2000-2020. Despite a slowing economic trend, the Chinese mining industry continues to experience growth. China produces about half of the world's steel, imports more than 70% of the world’s seaborne iron ore, and produces around 90% of the world’s rare earth metals. The paper demonstrates the importance of the Chinese mining sector and describes the key concepts of the successful government and business strategies.

Dual-Cure Benzoxazine Networks For Additive Manufacturing, Jeremy Weigand

Dissertations

The research presented addresses the design of novel materials for additive manufacturing through a dual-cure approach that combines UV initiated free-radical polymerization of an acrylic network combined with the thermally initiated ring opening polymerization of a benzoxazine network. This work is split into three primary sections: the first and second sections focus on the synthesis and characterization of networks based on dual-cure BOX monomers, while the third develops simulation tools to further investigate thermoset networks prepared via additive manufacturing. A novel 3D printing formulation based on a multifunctional benzoxazine (BOX) monomer possessing both photo and thermally polymerizable functional groups is …

Removal Of Fluoride From Mine Water Via Adsorption For Land-Applied Soil Amendment, Ethan Phan, Adrian Damian, Kevin Le, Mary Johnson, Courtney Golman, Michelle Dopp, Jacqueline Payne

Chemical Engineering Undergraduate Honors Theses

The process of mining minerals and elements from ores and rocks creates acid rock drainage (ARD). This drainage is water that contains heavy metals and minerals that can be dangerous for human consumption or damaging to the environment. The mining industry has employed various water treatment methods to prevent these metals and minerals from being discharged into water sources such as ponds, lakes, and streams. Currently, the most used treatment process in the mining industry is a cost-effective high-density sludge (HDS) process. This method reduces the concentration of metals and elements with the use of lime/limestone. However, the concentration of …

The Problem-Solving Workshop: Adapting Process Improvement Methodologies For K-12 Educators, Madison Chan

Honors Theses

Lean and Six Sigma have been lauded in the manufacturing sector for their ability to streamline processes, reduce waste, minimize variation and defects, and improve the bottom line. Although these methodologies have begun to spread to other industries, their impact has been relegated to certain areas and has largely missed others. One area that bears strong consideration is education. Education is heavily process-based and notoriously tight on resources. It is hypothesized that if educators were taught the basics of these strategies and were able to implement them in the classroom setting, the effectiveness of both teaching strategies and classroom operations …

Towards Gross-Pitaevskiian Description Of Solar System & Galaxies, Florentin Smarandache, Victor Christianto, Yunita Umniyati

Branch Mathematics and Statistics Faculty and Staff Publications

In this paper, we argue that Gross-Pitaevskii model can be a more complete description of both solar system and spiral galaxies, especially taking into account the nature of chirality and vortices in galaxies. We also hope to bring out some correspondence among existing models, e.g., the topological vortex approach, Burgers equation in the light of KAM theory, and the Cantorian Navier-Stokes approach. We hope further investigation can be done around this line of approach.

Ten Questions Concerning Well-Being In The Built Environment, Sergio Altomonte, Joseph Allen, Philomena M. Bluyssen, Gail Brager, Lisa Heschong, Angela Loder, Stefano Schiavon, Jennifer A. Veitch, Lily M. Wang, Pawel Wargocki

Durham School of Architectural Engineering and Construction: Faculty Publications

Well-being in the built environment is a topic that features frequently in building standards and certification schemes, in scholarly articles and in the general press. However, despite this surge in attention, there are still many questions on how to effectively design, measure, and nurture well-being in the built environment. Bringing together experts from academia and the building industry, this paper aims to demonstrate that the promotion of well-being requires a departure from conventional agendas. The ten questions and answers have been arranged to offer a range of perspectives on the principles and strategies that can better sustain the consideration of …

Controller And Headset Stand: Designing And Manufacturing, Tyler Butler, Chad Gutierrez

Honors Theses

This report shows how our Senior Center for Manufacturing Excellence team took our product, a controller and headset stand, from an idea into a mass producible product. We first identified the problem of headphones and controller storage and sought to solve it through our product design. Market research was performed to ensure that this would be a successful product in today’s marketplace. The trials of prototypes demonstrated what features could and could not be implemented into the design of the product. The group then designed a manufacturing plan for the product and found the projected market for the product. This …

Applications Of The Negatively-Charged Silicon Vacancy Color Center In Diamond, Forrest A. Hubert

Optical Science and Engineering ETDs

The spatial resolution and fluorescence signal amplitude in stimulated emission depletion (STED) microscopy is limited by the photostability of available fluorophores. Here, we show that negatively-charged silicon vacancy (SiV) centers in diamond are promising fluorophores for STED microscopy, owing to their photostable, near-infrared emission and favorable photophysical properties. A home-built pulsed STED microscope was used to image shallow implanted SiV centers in bulk diamond at room temperature. We performed STED microscopy on isolated SiV centers and observed a lateral full-width-at-half-maximum spot size of 89 ± 2 nm, limited by the low available STED laser pulse energy (0.4 nJ). For a …

Understanding Individual Color Perceptions Within Print And Digital Media, Morgan Haskins

Honors Theses

Color is a subjective attribute that is seen differently by each individual and this research is intended to build upon the subjective nature of color perceptions. This research aims to determine the effect of subjectivity on print and digital design and of extended gamut printing and effective color management on color perception. The significance of understanding color perception is directly applicable to consumer perception of designs using color. If designers want their brand to be immediately recognized and be positively accepted, they must be able to accurately reproduce their brand colors with little to no color difference and be able …

Mid-Ir Optical Refrigeration And Radiation Balanced Lasers, Saeid Rostami

Optical Science and Engineering ETDs

This dissertation reports recent advances in mid-infrared (mid-IR) optical refrigeration and Radiation Balanced Lasers (RBLs). The first demonstration of optical refrigeration in Ho:YLF and Tm:YLF crystals as promising mid-IR laser cooling candidates is reported. Room temperature laser cooling efficiency of Tm- and Ho-doped crystals at different excitation polarization is measured and their external quantum efficiency and background absorption are extracted. Complete characterization of laser cooling samples is obtained via performing detailed low-temperature spectroscopic analysis, and their minimum achievable temperature as well as conditions to achieve laser cooling efficiency enhancement in mid-IR are investigated. By developing a Thulium-doped fiber amplifier, seeded …

Comparison Of Pretreatment Methods For Cellulosic Ethanol, Michael Eaton

Honors Theses

Bioethanol provides a great alternative to regular ethanol sources because it uses secondary substrates that are byproducts of other industries, rather than substrates that compete with food products. The technology is available for industrial bioethanol production, but the production costs just aren’t competitive enough with traditional ethanol production. The goal of this project was not to prepare a proposal for a bio-ethanol plant with all of the associated costs and financial calculations, but rather to provide a direct comparison of two pretreatment methods to highlight which factors could make one method less costly than the other. Pretreatment is a critical …

Paper Recycling Fiber Recapture, Abigail Cortright

Honors Theses

The goal of the Yoda Chemical Company Paper Recycling Fiber Recapture project and subsequent report was to identify and recommend plant optimization opportunities associated with the potential recovery of five waste streams. Additionally, an analysis of the upgrade’s design was completed in order to determine the economic viability of fiber recapture. Beginning the analysis, the five waste streams were identified and analyzed. The waste streams include the top liner, back liner, and filler liner primary cleaner rejects on the K1 machine, the common rejects from under the K3 paper machine, and the tertiary cleaner rejects from stock preparation.

Two different …

Development Of A Flexible Printed Paper-Based Battery, Justone Crosby

Honors Theses

Market demand for flexible electronics continues to grow, which, in turn, increases the demand for flexible energy storage devices. There are several types of energy storage devices available, including the alkaline (Zn-MnO₂) battery, which is the subject of this project. This project's objective was to develop a flexible, printed paper-based battery, which may be a sustainable solution to the increasing market demand. This device is low-cost and can be manufactured commercially using a scalable process.

The proposed device is an alkaline flexible cell, whose components can be printed onto paper. This alkaline system includes a zinc-based negative electrode …

A Data-Driven Model For Multiphase Flow In Pipes, Francisco Bruno Xavier Teles

LSU Master's Theses

Steady-state models commonly used to determine pressure gradient in wells are either empirical correlations or are dependent on empirical parameters correlated to specific flow conditions such as pressures, temperatures, fluid types, and pipe inclinations. The empirical nature of these models leads to limitations in predicting cases in a wide range of conditions. Established models may be delivering inaccurate results when applied at conditions beyond those which they were derived from. For instance, models available in the literature have shown to have limitations when used in large diameter pipes and high-velocity scenarios.

This work aims to evaluate different flow models with …

Studies Of Oval Tube And Fin Heat Exchangers, Phillip Nielsen

Discovery Day - Prescott

Heating Ventilation and air-conditioning (HVAC) is a system which changes the temperature of the surroundings for the purposes of cooling or heating. This system requires energy to maintain a temperature difference from the outside temperature. This is important since minimized power is one of the requirements for the system to achieve a better efficiency. Optimizing the flow over the evaporator coils is one way to increase the cooling efficiency. This will reduce the power required to have a sustainable system. Optimizing the flow to increase the energy transfer between the fins and the incoming air could result in a greater …