Digital Commons Network^™

A Periodic Review Base Stock Inventory System With Sales, Yanyi Xu, Arnab Bisi, Maqbool Dada

Purdue CIBER Working Papers

We consider a system in which an order is placed every T periods to bring the inventory position up to the base stock S. We accept demand until the inventory position reaches a sales rejection threshold M. Our objective is to find the optimal values of S and M which minimize the long-run average cost per period. We establish the stationary distribution of our system and develop structural properties of the optimal solution that facilitate computation. In particular, we show that in an optimal solution, the optimal value of M is non-negative under some reasonable conditions. Hence, in our model …

Geospatial Analysis Of Roadway Traffic Volume, Flow Simulation, And Air Pollution Impacts On Built Environment, Jessica Headrick

Electronic Theses and Dissertations

No abstract provided.

Use Of Web-Based Lessons Of Statistical Concepts With Graphics And Animation To Enhance The Effectiveness Of Learning, Lavanya Pillala

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Statistics is of critical importance to engineers. However, many engineering students struggle to grasp the meaning of statistical concepts and the idiosyncrasies of statistical methodologies. Because of this problem, instructors of statistics are constantly searching for better ways to help students understand statistical concepts. The goal of this project is to design and develop web-based lessons that use graphics and animations to enhance the effectiveness of students' learning of statistical concepts.

Lessons of three important statistical concepts have been developed for this thesis - normal distribution, central limit theorem and confidence & tolerance intervals - following well-recognized instructional design development …

Determining Metastable Densities In An Argon Discharge Through Optical Emission Spectroscopy, Jared A. Miles

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A plasma diagnostic technique has been experimentally demonstrated where optical emission measurements of relative intensities of spectral lines in the violet range were combined with available electron-impact cross sections to yield absolute Ar metastable species concentration. An enabling factor of this analysis was that the electron excitation pattern was quite different between the Ar ground state and the metastable state. The result of this pattern was that the optical spectrum was unique depending on whether the emission was generated by direct excitation from the ground state, or by stepwise excitation from one of the metastable states. This study has shown …

Functionalized, Semicrystalline Poly(Ether Ketone)S Via In Situ Modification Chemistry, Raghavendhar Reddy Kotha

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AB3 monomer (3,4,5-Trifluoro-4'-hydroxybenzophenone) was used for polymerizations in order to mimic the combination of AB and AB2 monomers, and which has potential to facilitate concurrent polymerization and functionalization. 'Pre' and 'post' polymerization functionalization of the PEK system was done using phenol, 4-bromophenol, and 3/4-aminophenol. The solubility of the functionalized polymers was increased; and the crystallinity was decreased significantly compared to the corresponding unfunctionalized homopolymer. The polymers were characterized by 1H and 13C NMR spectroscopy, Gel Permeation Chromatography (GPC), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC). DSC results showed that the crystallinity of the polymer was tuned by the amount …

Understanding User-Generated Content On Social Media, Bala Meenakshi Nagarajan

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Over the last few years, there has been a growing public and enterprise fascination with 'social media' and its role in modern society. At the heart of this fascination is the ability for users to participate, collaborate, consume, create and share content via a variety of platforms such as blogs, micro-blogs, email, instant messaging services, social network services, collaborative wikis, social bookmarking sites, and multimedia sharing sites.

This dissertation is devoted to understanding informal user-generated textual content on social media platforms and using the results of the analysis to build Social Intelligence Applications.

The body of research presented in this …

A Unified Method For Detecting And Isolating Process Faults And Sensor Faults In Nonlinear Systems, Niharika Sonti

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With the increase in the complexity of control systems design and the demand for more productivity, the possibility of the occurrence of faults in control systems has also significantly increased. In this thesis, a unified method for the fault diagnosis of sensor faults and process faults is developed for a class of Lipschitz nonlinear uncertain systems. The fault detection and isolation (FDI) architecture is comprised of a fault detection estimator and a bank of fault isolation estimators (FIEs), where each FIE is designed, based on the functional structure of a particular fault, in the fault class under consideration. The output …

Revision Of The Genus Erythromelana Townsend, 1919 (Diptera: Tachinidae) With Notes On Their Phylogeny And Diversification, Diego Javier Inclan Luna

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The neotropics harbor an enormous diversity of tachinid flies, yet the fauna remains poorly known. The tribe Blondeliini is particularly diverse in this region and desperately needs taxonomic attention. Here, I present a revision of the neotropical genus Erythromelana Townsend including the redescription of three previously described species and the description of 11 new species. Two species previously assigned into this genus, are resurrected as distinct genera. Erythromelana species are widely distributed from southern Mexico to northern Argentina, with the Andes being a hotspot of diversity. Erythromelana are specialized on geometrids in the genus Eois, which mainly feed on plants …

Reservoir Analysis Of The Clinton Interval In Stark And Summit Counties, Ohio, Dominick Andrew Wytovich

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The characteristics of a sandstone reservoir of Silurian age (the "Clinton interval") were analyzed using 382 geophysical well logs from the Dominion Gas storage field located in Stark and Summit Counties, Ohio. These sandstones have long been identified by the informal drillers' terms, White, Red, and Stray Clinton. Gamma ray logs were used to analyze the distribution of net stand thickness and its relation to initial production through the construction of isopach and net sand isolith maps. I constructed eight cross sections to identify and correlate the tops of three prominent sandstones and two marine flooding surfaces to evaluate reservoir …

Fabrication Of Zinc Oxide Thin Films For Renewable Energy And Sensor Applications, Theresa Y. Hill

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Progress in commercializing renewable energy technologies is being advanced by developments in Zinc Oxide material science. The photovoltaic cell, for example, generates electricity by receiving solar energy into the cell, generating electrons, and simultaneously transporting electrical charge out of the cell. Metals are capable of removing electrical charge but block transmission of sunshine. Glass and plastics are capable of transmitting sunshine but block the removal of electrical charge. Therefore an exterior layer that is both optically transparent and electrically conductive is desirable. Transparent conductive oxides (TCOs) are the ideal material for such applications since they are capable of both functions. …

An Assessment Of White-Tailed Deer (Odocoileus Virginianus) Dynamics, Management, And Impacts In Highly Fragmented Landscapes, Bambi Shafer

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Habitat and forage selection by deer can cause local extinction of plant species. In my research, I asked: 1) How do deer population growth rates in urban parks change through time? 2) Are culling rates and deer densities correlated? 3) Are browse rates on Trillium spp. and deer densities correlated? I used FLIR deer census data from Davis Aviation and culling data from Five Rivers MetroParks (Montgomery County, Ohio). I found that deer population growth rates generally declined from 2003 to 2008. The number of deer culled was positively correlated to the deer densities. The browse rates of Trillium spp. …

Reflexivity In Pigeons, Mary M. Sweeney, Peter J. Urcuioli

Department of Psychological Sciences Faculty Publications

A recent theory of pigeons’ equivalence-class formation (Urcuioli, 2008) predicts that reflexivity, an untrained ability to match a stimulus to itself, should be observed after training on two “mirror-image” symbolic successive matching tasks plus identity successive matching using some of the symbolic matching stimuli. One group of pigeons was trained in this fashion; a second group was trained similarly but with successive oddity (rather than identity). Subsequently, comparison-response rates on novel matching versus mismatching sequences with the remaining symbolic matching stimuli were measured on non-reinforced probe trials. Higher rates were observed on matching than on mismatching probes in the former …

Associative Symmetry And Stimulus-Class Formation By Pigeons: The Role Of Non-Reinforced Baseline Relations, Peter J. Urcuioli

Department of Psychological Sciences Faculty Publications

Two experiments tested the assumption of Urcuioli’s (2008) theory of pigeons’ equivalence-class formation that consistent non-reinforcement of certain stimulus combinations in successive matching juxtaposed with consistent reinforcement of other combinations generates stimulus classes containing the elements of the reinforced combinations. In Experiment 1, pigeons were concurrently trained on symbolic (AB) and two identity (AA and BB) successive tasks in which half of all identity trials ended in non-reinforcement but all AB trials were reinforced, contingent upon either responding or not-responding to the comparisons. Subsequent symmetry (BA) probe trials showed evidence of symmetry in one of four pigeons. In Experiment 2, …

Oil-Refrigerant R134a Mixture Non-Isothermal Two-Phase Flow Through The Radial Clearance Of Rolling Piston Compressors, Jose Luiz Gasche, Adriano Domingos Ferreira

International Compressor Engineering Conference

No abstract provided.

Using Pv Diagram Synchronized With The Valve Functioning To Increase The Efficiency On The Reciprocating Hermetic Compressors, Marcelo Alexandre Real, Eduardo Augusto Gomes Pereira

International Compressor Engineering Conference

No abstract provided.

Theoretical Analysis Of The Volumetric Efficiency Reduction In Reciprocating Compressors Due To In-Cylinder Thermodynamics, Joao Ernesto Schreiner, Cesar J. Deschamps, Jader R. Barbosa

International Compressor Engineering Conference

No abstract provided.

Facilitating Teaching And Research On Open Ended Problem Solving Through The Development Of A Dynamic Computer Tool, Matthew Verleger, Heidi Diefes-Dux

School of Engineering Education Graduate Student Series

Model Eliciting Activities (MEAs) are realistic open-ended problems set in engineering contexts; student teams draw on their diverse experiences both in and out of the classroom to develop a mathematical model explicated in a memo to the client. These activities have been implemented in a required first-year engineering course with enrollments of as many as 1700 students in a given semester. The earliest MEA implementations had student teams write a single solution to a problem in the form of a memo to the client and receive feedback from their TA. For research purposes, a simple static online submission form, a …

Design And Optimization Of Refrigeration Cassettes For Light Commercial Applications, Maicon Waltrich, Christian Hermes, Claudio Melo

International Refrigeration and Air Conditioning Conference

No abstract provided.

Experimental Investigation Of Closed Loop Oscillating Heat Pipe As The Condenser For Vapor Compression Refrigeration, Pracha Yeunyongkul, Phrut Sakulchangsatjatai, Afshin J. Ghajar

International Refrigeration and Air Conditioning Conference

No abstract provided.

Phase Change Materials For Domestic Refrigerators To Improve Food Quality And Prolong Compressor Off Time, Chetan Tulapurkar, Pradip Radhakrishnan Subramaniam, G. Thagamani, Ramasamy Thiyagarajan

International Refrigeration and Air Conditioning Conference

No abstract provided.

Research On Ground Source Heat Pump Design, Amanda Jo Pertzborn, Gregory Nellis, Sanford Klein

International Refrigeration and Air Conditioning Conference

No abstract provided.

Capacity And Acoustic Optimization On A Fan/Heat Exchanger Unit, Sophie Colmek

International Refrigeration and Air Conditioning Conference

No abstract provided.

Dynamic Modeling Of Mechanical Draft Counter-Flow Wet Cooling Tower With Modelica, Xiao Li, Yaoyu Li, John E. Seem

International Refrigeration and Air Conditioning Conference

No abstract provided.

Numerical Simulation Of Capillary Tubes. Application To Domestic Refrigeration With Isobutane, Nicolas Ablanque, Joaquim Rigola, Carlos Pérez-Segarra, Assensi Oliva

International Refrigeration and Air Conditioning Conference

No abstract provided.

Modeling Of Silica Gel Dehydration Assisted By Power Ultrasonic, Ye Yao, Weijiang Zhang, Yinbo Peng, Lirui Wang, Yifeng Liu, Binbin Chen

International Refrigeration and Air Conditioning Conference

No abstract provided.

Method For Quantitatively Analyzing Flow Phenomena In Annular-Mist Two-Phase Flows, Scott S. Wujek, Predrag S. Hrnjak

International Refrigeration and Air Conditioning Conference

No abstract provided.

A Numerical Study On The Application Of Nanofluids In Refrigeration Systems, Juan Carlos Valdez Loaiza, Frank Chaviano Pruzaesky, Jose Alberto Reis Parise

International Refrigeration and Air Conditioning Conference

No abstract provided.

Transient Lumped Parameter Modeling For Vapour Compression Cycle Based Refrigerator, Chetan Tulapurkar, Richa Khandelwal

International Refrigeration and Air Conditioning Conference

No abstract provided.

Numerical Assessment Of Frosting And Defrosting Of ‘No-Frost’ Evaporators, Fernando Knabben, Christian Hermes, Claudio Melo

International Refrigeration and Air Conditioning Conference

No abstract provided.

Energy Saving Opportunities In An Air Separation Process, Liwei Yan, Yunsong Yu, Yun Li, Zaoxiao Zhang

International Refrigeration and Air Conditioning Conference

No abstract provided.