82,522 Works

Drawing Statistical Inferences from International Census Data

Lara L. Cleveland, Michael Davern & Steven Ruggles
Although census microdata used by social scientists derive from complex samples, researchers commonly apply methods designed for simple random samples. Using full count census data from 4 countries, we evaluate the impact of sample design on standard error estimates of microdata samples from the IPUMS International. We compare replicate standard error estimates from the full count data to estimates from the 10% public use samples using 3 methods: subsample replicate, Taylor series linearization, and estimates...

Women’s Experiences of Discontinuing Hormone Therapy: A Dissertation

Mary A. Fischer

The Role of the Mass Media in Women’s Infant Feeding Decisions: A Dissertation

Paula Bylaska-Davies

Patient Safety: A Multi-Climate Approach to the Nursing Work Environment: A Dissertation

Barbara H. Weatherford

Open source GIS for archaeological data visualisation and analysis

Anna Hodgkinson, Christina Robinson & Oxford Archaeology North

Trends of HCl, ClONO₂, and HF column abundances from ground-based FTIR measurements in Kiruna (Sweden) in comparison with KASIMA model calculations

R. Kohlhepp, S. Barthlott, Thomas Blumenstock, F. Hase, I. Kaiser, U. Raffalski & R. Ruhnke
Trends of hydrogen chloride (HCl), chlorine nitrate (ClONO2), and hydrogen fluoride (HF) total column abundances above Kiruna (Northern Sweden, 67.84$^\circ\text{N}$, 20.41$^\circ\text{E}$) derived from nearly 14 years (1996–2009) of measurement and model data are presented. The measurements have been performed with a Bruker 120HR (later Bruker 125 HR) Fourier transform infrared (FTIR) spectrometer and the chemistry-transport model (CTM) used was KASIMA (KArlsruhe SImulation model of the Middle Atmosphere). The total column abundances of ClONO2 and HF...

Endocrine effect assessment for wild mammals

Markus Ebeling & Raimund Grau -Bayer

The Conjugate Addition- Elimination Reaction of Morita-Baylis-Hillman C- Adducts: A Density Functional Theory Study

Davin Tan
The Morita-Baylis-Hillman (MBH) reaction is a very versatile synthetic protocol to synthesize various useful compounds containing several functional groups. MBH acetates and carbonates are highly valued compounds as they have good potential to be precursors for organic synthesis reactions due to their ease of modification and synthesis. This thesis utilizes Density Functional Theory (DFT) calculations to understand the mechanism and selectivity of an unexpected tandem conjugate addition-elimination (CA-E) reaction of allylic alkylated Morita-Baylis-Hillman C- adducts....

Sequential Optimization of Global Sequence Alignments Relative to Different Cost Functions

Enas M. Odat
The purpose of this dissertation is to present a methodology to model global sequence alignment problem as directed acyclic graph which helps to extract all possible optimal alignments. Moreover, a mechanism to sequentially optimize sequence alignment problem relative to different cost functions is suggested. Sequence alignment is mostly important in computational biology. It is used to find evolutionary relationships between biological sequences. There are many algo- rithms that have been developed to solve this problem....

Pincer Complexes with Isopropyl Substituents A Density Functional Theory Study

XiaoZhi Lim
Complexes with pincer ligand moieties have garnered much attention in the past few decades. They have been shown to be highly active catalysts in several known transition metal-catalyzed organic reactions as well as some unprecedented organic transformations. At the same time, the use of computational organometallic chemistry to aid in the understanding of the mechanisms in organometallic catalysis for the development of improved catalysts is on the rise. While it was common in earlier studies...

High Resolution Robust GPS-free Localization for Wireless Sensor Networks and its Applications

Mohammed Mirza
In this thesis we investigate the problem of robustness and scalability w.r.t. estimating the position of randomly deployed motes/nodes of a Wireless Sensor Network (WSN) without the help of Global Positioning System (GPS) devices. We propose a few applications of range independent localization algorithms that allow the sensors to actively determine their location with high resolution without increasing the complexity of the hardware or any additional device setup. In our first application we try to...

First-Principles Investigations on Europium Monoxide

Hao Wang
Europium monoxide is both an insulator and a Heisenberg ferromagnet (Tc=69 K). In the present thesis, the author has investigated the electronic structure of different types of EuO by density functional theory. The on-site Coulomb interaction of the localized Eu 4f and 5d electrons, which is wrongly treated in the standard generalized gradient approximation method, is found to be crucial to obtain the correct insulating ground state as observed in experiments. Our results show that...

Shilling Attack Prevention for Recommender Systems Using Social-based Clustering

Tak Lee
A Recommender System (RS) is a system that utilizes user and item information to predict the feeling of users towards unfamiliar items. Recommender Systems have become popular tools for online stores due to their usefulness in confidently recommending items to users. A popular algorithm for recommender system is Collaborative Filtering (CF). CF uses other users' profiles to predict whether a user is interested in a particular object. This system, however, is vulnerable to malicious users...

Nonlinear Wave Propagation and Solitary Wave Formation in Two-Dimensional Heterogeneous Media

Manuel Luna
Solitary wave formation is a well studied nonlinear phenomenon arising in propagation of dispersive nonlinear waves under suitable conditions. In non-homogeneous materials, dispersion may happen due to effective reflections between the material interfaces. This dispersion has been used along with nonlinearities to find solitary wave formation using the one-dimensional p-system. These solitary waves are called stegotons. The main goal in this work is to find two-dimensional stegoton formation. To do so we consider the nonlinear...

Optimal Power Allocation of a Wireless Sensor Node under Different Rate Constraints

Jose Solares
Wireless sensor networks consist of the placement of sensors over a broad area in order to acquire data. Depending on the application, different design criteria should be considered in the construction of the sensors but among all of them, the battery life-cycle is of crucial interest. Power minimization is a problem that has been addressed from different approaches which include an analysis from an architectural perspective and with bit error rate and/or discrete instantaneous transmission...

Analysis of the Complex Gross-Pitaevskii Equation for the Bose-Einstein Condensation of Exciton-Polaritons

Jesus Núñez
Considered as a fundamental step for the development of the atomic laser and quantum computing, as well as the theoretical explanation of super fluidity, the Bose- Einstein condensate (BEC) has emerged as one of the most important topics in modern physics. This project is devoted to the analysis of a condensate based on exciton-polaritons. This BEC is characterized by a high critical temperature of condensation (about 20 K) and non-equilibrium dynamics. A mathematical model called...

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