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Alteration Associated With Gold Deposition At The Getchell, Carlin-Type Gold Deposit, North-Central Nevada, Tracy Lynn Cail

UNLV Theses, Dissertations, Professional Papers, and Capstones

Alteration at the Getchell deposit was examined to determine the effects of ore-bearing fluids on host lithologies and the relationship between K-bearing alteration minerals and Au deposition. The geochemistry of unaltered to highly altered and mineralized rocks from the Getchell deposit was quantified for 54 samples collected along 14 transects in calcareous siltstone, carbonaceous limestone, and a rhyodacitic dike. Each transect was collected along a single homogeneous bed that could be followed from visibly unaltered waste rock into high-grade ore.

Calculated elemental gains and losses record an increase in the concentrations of Au, Hg, Sb, Se, Si, Te, Tl, and …

How Permanent Became Temporary In Del Monte Dunes, Michael C. Levine

Duke Law Journal

Regulatory takings are like car accidents. They fascinate us. We cannot help slowing down to look. What a disaster, we say to ourselves. We are so glad it did not happen to us. But we wonder if we could be next, We think about who is at fault, who should pay for the damages, and how it all could have been avoided in the first place And we question how the rules of the road could be improved so that such collisions in the future could be averted.

Trace-Level Determination Of Fluorescently Labeled Phenoxy Acid Herbicides And The Study Of Their Crop Uptake And Soil Accumulation, Noura Saeed Al Nuaimi

Theses

A challenging problem facing the determination of phenoxy acid herbicides in samples is their low UV absorptivity and the interference associated with the matrix in which these analytes exist. This thesis is concerned with improving the detection limits of this group of herbicid as well as reduce or eliminate interference associated with the sample matrix.

Native phenoxy acid herbicides could be analyzed by high performance liquid chromatography (HPLC) with ultraviolet detection. Phenoxy herbicides were analyzed by HPLC employing a gradient conditions that allowed baseline resolution of all analytes used in this study in approximately 20 min. However, the average detection …

Events Of Interest, Natercia F. Rodrigues, Charles W. N. Davies, Tanja Masson-Zwaan, Edward R. Finch

Journal of Space Law

A. PAST EVENTS U.N Reports Review of the Work of the United Nations Committee on the Peaceful Uses of Outer Space and its Subcommittees, 1999, Natercia F. Rodrigues and Charles W. N. Davies Third United Nations Conference on the Exploration and Peaceful Uses of Outer Space (UNISPACE III), Vienna, Austria, 19-30 July 1999, Charles W. N. Davies Other Report IISL Colloquium, 4-8 October 1999, Amsterdam, Tanja Masson Zwaan Comments Commercial Space Development in Millennium 2000, Amb. (Dr.) Edward R. Finch, Esq. Third United Nations Conference on the Exploration and Peaceful Uses of Outer Space (UNISPACE III), Vienna 30 July 1999, …

A Literature Review On Methods Being Used For Hot Tearing And Shrinkage Prevention In The Permanent Mold Casting Of Aluminum Alloys, Matthew D. Nolte

Graduate Research Papers

Statement of the Problem: What can be done to eliminate the threat of hot tears and shrinkage in the production of aluminum rims?

Research Questions:

The research being carried out will use a library research or a literature review methodology. The research will provide answers to the following questions:

1. What do sources of authority cite as being the most effective ways to prevent hot tearing and shrinkage in the production of aluminum rims?

2. Is there a way to predict where hot tearing and shrinkage will occur in a casting before any castings are poured?

3. What is being …

Reciprocal Transplantation Of The Desert Soil Crust: Can It Be Done?, Christina D. Cole

UNLV Theses, Dissertations, Professional Papers, and Capstones

A 100 meter X 100 meter study site was chosen at White Rock Springs in Red Rock Canyon National Conservation Area, Nevada. To examine Syntrichia caninervis, a desert crustal moss, reciprocal transplantations (20 mm and 40 mm diameter cores) were performed between shaded to shaded, exposed to exposed, and shaded to exposed microsites to determine if it was possible to transplant the study organism with reasonable survivorship. Transplants were inspected following rain events for percent hydration, number of dead stems, and change in percent cover. Data indicated that there was a low mortality rate of S. caninervis stems, and few …

From Austria To The United States And From Evaluating Therapists To Developing Cognitive Resources Theory: An Interview With Fred Fiedler, Robert Hooijberg, Jaepil Choi

Research Collection Lee Kong Chian School Of Business

Interviews Fred Fiedler, researcher on the field of leadership as part of a study that aims to obtain a sense of researchers' personality, research ideas and insights on the state of the field. Personal and professional background; Fiedler's research program; Leadership studies trends; Accomplishments in research; Contributions to the study of leadership.

Further Studies On Fire Retardant Polystyrene By Friedel–Crafts Chemistry, Zhitao Wang, David D. Jiang, Charles Wilkie, Jeffery W. Gilman

Chemistry Faculty Research and Publications

The combination of a copolymer of 4-vinylbenzyl alcohol and styrene with 2-ethylhexyldiphenylphosphate (DPP) and with metal chlorides has been studied by TGA, radiative gasification, Cone Calorimetry, and oxygen index measurements. Evidence is presented in support of a cross-linking reaction with the additives and the copolymer, which proceeds through a Friedel–Crafts mechanism. This approach reduces the peak heat release rate (HRR) by 60% as measured in the Cone Calorimeter. There is a significant reduction in the mass loss rate during the thermal degradation, and evidence of char formation is observed in the radiative gasification experiments.

Design And Development Of Fuzzy Expert System For Handy Board, Aditya Kumar Singh

Graduate Theses, Dissertations, and Problem Reports (ETD)

The recent trend in global manufacturing scenario has resulted in the emergence of many innovative techniques that have revolutionized the manufacturing industry as a whole. A lot of states of art advances have been associated with the increasing use of microprocessors in advance manufacturing systems. Out of many the one, which has predominantly captured the real time, behavioral use is the Fuzzy Logic.;Fuzzy logic implementation in real time environment involves the integration of multi-disciplinary area like computer engineering, mechanical and electronic systems tailored towards smart systems that enable a very precise control on the process. The fuzzy logic based project …

Study Of The Kalman Filter For Arrhythmia Detection With Intracardiac Electrograms, Pisut Raphisak

Graduate Theses, Dissertations, and Problem Reports (ETD)

Third generation implantable antitachycardia devices offer tiered-therapy to reverse ventricular fibrillation (VF) by defibrillation and ventricular tachycardia (VT) by low-energy cardioversion or antitachycardia pacing. The schemes for detecting cardiac arrhythmias often realize nonpathologic tachycardia as serious arrhythmias and deliver false shocks. In this study, an arrhythmia classification technique has been developed with the use of Kalman filter applied on cyclostationary autoregressive model. This new algorithm was developed with a training set of 24 arrhythmia passages and tested on a different data set of 29 arrhythmia passages. The algorithm provides 100% detection of VF on the test set. 77.8% of VTs …

Effects Of Turbidity On The Foraging Abilities Of Brook Trout (Salvelinus Fontinalis) And Smallmouth Bass (Micropterus Dolomieu), John A. Sweka

Graduate Theses, Dissertations, and Problem Reports (ETD)

Sedimentation is the major pollutant of waters in North America. Most research on the effects of increased sedimentation has focussed on its effects on stream habitat and its ramification on the reproductive potential of fish. Although relatively large sediment loads may be necessary to alter stream habitat, only small loads are needed to raise mean stream turbidity levels. Turbidity may be an important, yet relatively unexamined factor in stream fish production. With this, I sought to determine the influence of elevated turbidity on the foraging abilities of two predatory species representing both cold and warm water stream habitas, brook trout …

Development Of Decision Support System For Reliability, Mitesh Bhupendra Parekh

Graduate Theses, Dissertations, and Problem Reports (ETD)

Reliability analysis is now an essential part of any product development. In the field of Electrical Engineering, reliability models are developed and analyzed for every component before it comes to market. The complexity of the product can range from a simple transistor to an integrated circuit chip, from a simple communication link to a complex network, and from a small generator to a large powerhouse.;Over the period, several techniques have been developed to systematically model real systems and then analyze them. These techniques are constantly being enhanced to improve the modeling process and to reduce the time required for the …

Measurement Of Particulate Matter Size, Concentration And Mass Emissions From In-Use Heavy Duty Vehicles, Richard Jason Byers

Graduate Theses, Dissertations, and Problem Reports (ETD)

As technological advancements lower heavy duty vehicle particulate matter (PM) mass emission rates, there is concern that these improvements are increasing the toxicity of the PM by virtue of a subsequent reduction in particle size. These ultrafine particles are able to better penetrate the alveolar region where they can cause serious lung disorders. Alternative fuels such as compressed and liquefied natural gas (CNG and LNG) and the synthetic diesel fuel Mossgas are attractive in that they reduce the levels of total PM. However, use of natural gas in internal combustion engines may produce a larger number of smaller particles than …

Evaluation Of Ceramic Candle Filters Degradation And Damage Location Using Four-Point Bending Tests, Wu Tseng Peng

Graduate Theses, Dissertations, and Problem Reports (ETD)

The structural integrity of ceramic candle filters is a key element for hot gas cleanup systems. Ceramic candle filters used in demonstration plants have experienced degradation and fracturing. Preliminary examination of these ceramic filters indicated that damage of the filters may have resulted from strength degradation due to persistent high temperature operation, thermal transient events, excessive ash accumulation and bridging, and pulse cleaning. This study proposes a nondestructive evaluation of the structural properties of these ceramic filters. The ceramic candle filter is a slender structure made of layers of porous materials. The structure has high acoustic attenuation, which has greatly …

Museum Education: A Closer Look: Reinforcing Visual Literacy Skills Through Museum-School Collaboration, Margaret A. Wastie

Seton Hall University Dissertations and Theses (ETDs)

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Design And Development Of A Microwave-Enhanced Diesel Soot Oxidation System, Bret Allen Rankin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Diesel particulate matter (PM) emissions have created considerable concern because PM is a suspected carcinogen. Up to this point, improved engine and fuel system design and control schemes have made the use of diesel particulate aftertreatment systems unnecessary for most applications in the United States, but the continued decreasing trend of emissions regulations may necessitate the use of PM filters for many applications.;Many methods have been developed to generate a controlled, reliable regeneration event within PM filters, none of which have been proven to be completely successful. These methods include exhaust throttling, fuel catalysis, filter catalysis, electrical heating, and burner …

Social Judgement Tendencies As A Function Of Mcmi-Ii And Cati Personality Variables, Allison Noel Pate

Theses and Dissertations

This study investigated relationships between personality styles and judgments of others' personality traits using the Free Response Interaction Procedure (FRIP). FRIP participants were 184 female and 68 male college students, mean age 23.9 years. The FRIP consists of two 25-minute interactive sessions, separated by a week or more, in which a participant interacts with three randomly assigned participant partners. After each session, participants use a seven point likert scale to rate themselves and their partners, and predict how their partners will rate them on 14 personality traits. Participants also independently completed the Millon Clinical Multiaxial Inventory - II (MCMI-II) and …

Wiyn Open Cluster Study. Ii. Ubvri Ccd Photometry Of The Open Cluster Ngc 188, Ata Sarajedini, Ted Von Hippel, Vera Kozhurina-Platais, Pierre Demarque

Publications

We present high-precision UBVRI CCD photometry of the old open cluster NGC 188. Our color-magnitude diagram extends from near the red giant branch tip to as faint as ~5 mag below the main-sequence turnoff. From an analysis of these data along with published photometry for M67, we draw the following conclusions: (1) From the UBV two-color diagram, we find a reddening of E(B ̶ V) = 0.04 ± 0.02 for M67 and E(B ̶ V) = 0.09 ± 0.02 for NGC 188. (2) Based on main-sequence fitting to solar abundance isochrones, the distance moduli …

Production Of The Subtropical Seagrass, Halodule Wrightii Aschers., In Lower Laguna Madre, Texas, Joseph L. Kowalski

Theses and Dissertations - UTB/UTPA

The autecology of shoal grass, Halodule wrightii Aschers., was studied at 1.2 m depth from June 1995 to February 1997 in Lower Laguna Madre (LLM), Texas. Halodule wrightii in LLM received about 47% surface irradiance, but otherwise displayed lower growth rates and biomass in nutrient-poor rhizosphere and water-column environments compared to H. wrightii populations in other Texas estuaries. High tissue N content and low C:N ratios belied low growth dynamics. Halodule wrightii in LLM is probably nutrient limited. A high nutrient demand by H. wrightii in a nutrient-poor environment may explain, in part, its gradual displacement by Thalassia testudinum and …

Power, Performance, And Perception (P3): Integrating Usability Metrics And Technology Acceptance Determinants To Validate A New Model For Predicting System Usage, Alan P. Fiorello

Theses and Dissertations

Currently, there are two distinct approaches to assist information technology managers in the successful implementation of office automation software. The first approach resides within the field of usability engineering, while the second approach is derived from the discipline of management information systems (MIS). However, neither approach has successfully produced conclusive evidence that explains what characteristics facilitate system use as well as influence user acceptance of the system. This study reports on the validity of a new model, entitled the Power, Performance, Perception (P3) model, that links the constructs of usability engineering to user acceptance. Additionally, speech recognition software (SRS) was …

Multimode Solution For The Reflection Properties Of An Open-Ended Rectangular Waveguide Radiating Into A Dielectric Half-Space: The Forward And Inverse Problems, R. Zoughi, Aaron D. Benally, Karl Joseph Bois

Electrical and Computer Engineering Faculty Research & Creative Works

Open-ended rectangular waveguides are extensively used in nondestructive dielectric material evaluation. The dielectric properties of an infinite-half space of a material are calculated from the measured reflection properties referenced to the waveguide aperture. This calculation relies on a theoretical and numerical derivation of the reflection coefficient likewise referenced to the waveguide aperture. Most of these derivations assume the dominant mode field distribution across the waveguide aperture. However, when dealing with low permittivity and low loss dielectric materials, there may exist significant errors when calculating the dielectric properties from the measured reflection coefficient. These errors have also shown to be more …

Alcalá View 1999 16.04, University Of San Diego Publications And Human Resources Offices

Alcalá View (1985-2006)

A Season of Celebration and Spirit; Alumni Director at Home in His Work; Holiday Happenings; Fresh Air Permits; Benefits Briefs; New Employee Hires and Promotions; Health Benefits a Hot Topic with SEA; A look at the park; University Ministry Events; Passages; Classifieds; 5 O'Clock Humor; Readership Survey

Microscopic Origins Of Heliclinic Phases In Smectic Liquid Crystals, Jonathan J. Stott, Rolfe G. Petschek

Faculty Scholarship

In a previous article [Phys. Rev. E 60, 1799 (1999)], the authors considered a model Landau free energy that explained the ferriclinic phases of chiral smectic liquid crystals as a series of short period helical modulations. In this paper we begin with a physically more realistic, more microscopic interlayer free energy and show how our previous work can be derived using only simple short-ranged interactions. We then discuss what additional information this provides about the Landau coefficients used previously to construct the phase diagram for the heliclinic phases of chiral smectic liquid crystals. Finally, we investigate a means for explicitly …

Students' Mental Models Of Electricity In Simple Dc Circuits, Andrew C. Isola Iii

Dissertations

This study presents the results of research into middle school students' knowledge about the nature and mechanisms of action of electricity in simple DC circuits. Sixth, seventh, and eighth graders (n=99) were asked a series of questions about the roles of bulbs, batteries, wires, and electricity in circuits. Almost half the number of students (n=42) were found to have used detailed, well-defined, and logically consistent mental models based on their responses. A total of 15 different detailed mental models were documented in these students that belonged to one of four different general model types: (1) round trip flow using both …

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Characterisation Of The Effects Of Time And Pressure On A Group Of Electronic Voltage Standards, James Kevin Armstrong

Masters

Although primary metrology laboratories use standards based on the Josephson effect to maintain a local reference standard for dc voltage, artefact standards are still the standard of choice in many secondary laboratories. The National Metrology Laboratory, Dublin maintains a local reference standard for dc voltage by means of an ensemble of Zener-diode based electronic voltage standard units. Electronic voltage standards have a number of shortcomings over Josephson standards for use as a local reference standard. In particular their output voltages are influenced by several external factors. In order to make optimum use of the NML reference standard it is important …

Taking R&E To The Next Level, Thomas W. Blaine, Stephen Hudkins, Charles R. Taylor

Journal of Extension

During the late 1980s, the business retention and expansion (R&E) program emerged as one of the most successful programs in Ohio State University Extension's Community Development area. As the economic recovery of the early 1990s turned into an economic expansion, business and civic leaders began to shift focus from general R&E efforts to issues related to labor force preparedness. A survey of businesses in Portage County undertaken four years after completion of an R&E program reveals that, while employers believe that local resources are available to help improve basic math and communication skills of employees, those skill levels are still …

On-Road Remote Sensing Of Automobile Emissions In The Denver Area: Year 1, Peter J. Popp, Sajal S. Pokharel, Gary A. Bishop, Donald H. Stedman

Fuel Efficiency Automobile Test Publications

No abstract provided.

Measuring Information Quality Of Web Site: Development Of Instrument, P. Katerattanakul, Keng Siau

Research Collection School Of Computing and Information Systems

Web sites have been extensively used to provide information to consumers. While practitioners and researchers have proposed different criteria for effective Web site design based on common sense, intuition, and rules-ofthumb, effective Web site design focusing on the quality of the information it provides has rarely been studied. In this research, we propose a framework and develop an instrument to measure the information quality of individual or personal Web sites. The theoretical foundation of this research is the information quality framework. The proposed framework and instrument were tested in an individual or personal Web site context.

Mining Multiple-Level Association Rules In Large Databases, Jiawei Han, Yongjian Fu

Computer Science Faculty Research & Creative Works

A top-down progressive deepening method is developed for efficient mining of multiple-level association rules from large transaction databases based on the Apriori principle. A group of variant algorithms is proposed based on the ways of sharing intermediate results, with the relative performance tested and analyzed. The enforcement of different interestingness measurements to find more interesting rules, and the relaxation of rule conditions for finding `level-crossing' association rules, are also investigated in the paper. Our study shows that efficient algorithms can be developed from large databases for the discovery of interesting and strong multiple-level association rules.