Digital Commons Network^™

An Analysis Of Breast Cancer Metastasis, Jennifer Lee Gildner

Statistics

The main objective of this paper is to evaluate possible socio-economic status, clinical, and treatment associations with the occurrence of distant metastasis in Stage I – III breast cancer patients. After analysis in a logistic regression model, four variables were found to be significant with occurrence of distant metastases. These variables were: education, disease group (Triple-negative, Her2Neu-positive and Luminal A), stage at diagnosis, and concordance to chemotherapy based on the NCCN guidelines. Patients without a college degree were found to be more likely to develop distant metastasis than those with a college degree (OR = 2.46 95% CI 1.44 – …

Legibility Vs. The Fullness Of Expression : Rethinking The Transformation Of Modern Chinese Prose = 正當性 Vs. 表達的完滿 : 反思現代中文文論的轉化, Theodore Huters

Journal of Modern Literature in Chinese 現代中文文學學報

No abstract provided.

Agricultural Productivity Growth In Central America And The Caribbean, Ayako Ebata

Department of Agricultural Economics: Dissertations, Theses, and Student Research

This thesis estimates total factor productivity (TFP) growth in the agricultural sector of fourteen regions in Central America and the Caribbean. First, TFP is measured parametrically and non-parametrically, using the Ordinary Least Square (OLS) method and the Maximum Likelihood (ML) method to estimate a translog production function and the Malmquist index approach. Secondly, the thesis incorporates an environmental bad, CO₂ emissions from expansion of agricultural land by sacrificing forest area and estimates environmentally adjusted productivity (EAP) growth rates using an output distance function in order to assess how the growth of TFP rates changes when such a bad is …

Studies On Power Hop Using A Nonlinear Model Of An Agricultural Tractor, Adam B. Flaugh

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

Power hop is an unstable dynamic phenomenon that is observed on agricultural tractors operating at field working speeds under typical draft loads. This dynamic instability can be identified as a bounce motion preceded by an increasing oscillation in either the pitch or bounce modes. A definite and comprehensive correction or prevention strategy for the control of power hop does not exist. In this work a linear and a nonlinear model of an agricultural tractor were developed. The method of multiple time scales has been employed in the analysis of the nonlinear model. Numerical results have been obtained using Mathematica to …

First-Principles Studies On Physical And Chemical Properties Of Nanostructures, Menghao Wu

Department of Physics and Astronomy: Dissertations, Theses, and Student Research

The physical and chemical properties of decorated graphene and graphene ribbons, single-layer III-V systems, three-dimensional carbon and BN foam, and transition-metal-molecular sandwich nanowires have been investigated by first-principle calculations and their potential applications have been predicted. First, it is shown that zigzag graphene nanoribbons (ZGNRs) can be converted into half metal when their edges are decorated by some chemical functional groups, and the half-metalicity is induced by chemical potential difference between two edges when one edge is decorated by electron-donating group like –OH and the other edge is decorated by electron-accepting group like –F, -NH₂, -N(CH₃) …

A Stochastic Version Of The Em Algorithm To Analyze Multivariate Skew-Normal Data With Missing Responses, M. Khounsiavash, M. Ganjali, T. Baghfalaki

Applications and Applied Mathematics: An International Journal (AAM)

In this paper an algorithm called SEM, which is a stochastic version of the EM algorithm, is used to analyze multivariate skew-normal data with intermittent missing values. Also, a multivariate selection model framework for modeling of both missing and response mechanisms is formulated. By the SEM algorithm missing values of responses are inputed by the conditional distribution of missing values given observed data and then the log-likelihood of the pseudocomplete data is maximized. The algorithm is iterated until convergence of parameter estimates. Results of an application are also reported where a Bootstrap approach is used to compute the standard error …

Peristaltic Induced Flow Of A Two-Layered Suspension In Non-Uniform Channel, Amit Medhavi, Dharmendra Singh, Ajay S. Yadav, Ramesh S. Gautam

Applications and Applied Mathematics: An International Journal (AAM)

Peristaltic transport of a two-layered particulate suspension in a non-uniform channel has been investigated. The coupled differential equations for both the fluid and the particle phases in the central as well as in the peripheral layers have been solved and the expression for the flow rate, the pressure rise and the friction force has been derived. The results obtained are discussed both qualitatively and quantitatively in brief. The significance of the particle concentration as well as the peripheral layer has been well explained.

Applying Gmdh-Type Neural Network And Genetic Algorithm For Stock Price Prediction Of Iranian Cement Sector, Saeed Fallahi, Meysam Shaverdi, Vahab Bashiri

Applications and Applied Mathematics: An International Journal (AAM)

The cement industry is one of the most important and profitable industries in Iran and great content of financial resources are investing in this sector yearly. In this paper a GMDH-type neural network and genetic algorithm is developed for stock price prediction of cement sector. For stocks price prediction by GMDH type-neural network, we are using earnings per share (EPS), Prediction Earnings Per Share (PEPS), Dividend per share (DPS), Price-earnings ratio (P/E), Earnings-price ratio (E/P) as input data and stock price as output data. For this work, data of ten cement companies is gathering from Tehran stock exchange (TSE) in …

Modeling Spread Of Polio With The Role Of Vaccination, Manju Agarwal, Archana S. Bhadauria

Applications and Applied Mathematics: An International Journal (AAM)

In this paper, we have proposed and analyzed a nonlinear mathematical model for the spread of Polio in a population with variable size structure including the role of vaccination. A threshold parameter, R , is found that completely determines the stability dynamics and outcome of the disease. It is found that if R 1, the disease free equilibrium is stable and the disease dies out. However, if R >1, there exists a unique endemic equilibrium that is locally asymptotically stable. Conditions for the persistence of the disease are determined by means of Fonda’s theorem. Moreover, numerical simulation of the proposed …

A Group Acceptance Sampling Plans For Lifetimes Following A Marshall-Olkin Extended Exponential Distribution, G. S. Rao

Applications and Applied Mathematics: An International Journal (AAM)

In this paper, a group acceptance sampling plan is developed for a truncated life test when the lifetime of an item follows the Marshall-Olkin extended exponential distribution. The minimum number of groups required for a given group size and the acceptance number is determined when the consumer’s risk and the test termination time are specified. The operating characteristic values, according to various quality levels, are found and the minimum ratios of the true average life to the specified life at the specified producer’s risk are obtained. The results are explained with examples.

The Principle Of Linearized Stability For Size-Structured Population Models, M. El-Doma

Applications and Applied Mathematics: An International Journal (AAM)

The principle of linearized stability for size-structured population dynamics models is proved giving validity to previous stability results reported in, for example, El-Doma (2008-1). In particular, we show that if all the roots of the characteristic equation lie to the left of the imaginary axis then the steady state is locally exponentially stable, and on the other hand, if there is at least one root that lies to the right of the imaginary axis then the steady state is unstable. We also point out cases when there is resonance

Morphological Features Of Elongated-Anisotropic Magnetosome Crystals In Magnetotactic Bacteria Of The Nitrospirae Phylum And The Deltaproteobacteria Class, Christopher T. Lefèvre, Mihály Pósfai, Fernanda Abreu, Ulysses Lins, Richard B. Frankel, Dennis A. Bazlinski

Physics

High resolution transmission electron microscopy was used to study the crystallographic habits of the elongated magnetite crystals, variously described as bullet-, tooth- or arrowhead-shaped, in two recently described, uncultured, magnetotactic bacteria belonging to the Nitrospirae phylum designated Candidatus Magnetoovum mohavensis strain LO-1, and Candidatus Thermomagnetovibrio paiutensis strain HSMV-1; and a cultured sulfate-reducing magnetotactic bacterium of the Deltaproteobacteria class of the Proteobacteria phylum designated strain AV-1. The elongation axes of the magnetosomes do not coincide with the easy magnetization axis (which is [111]) but they are parallel to [100] in LO-1 and AV-1 and parallel to [110] in HSMV-1. In all …

Evidentiality In Uzbek And Kazakh, Christopher Straughn

Library Faculty Publications

The purpose of this work is to describe and account for the broad range of phenomena referred to as “evidentiality” in two Turkic languages: Uzbek and Kazakh. Much previous work on the Turkic languages treats evidentiality as a distinct verbal category. However, morphemes that express evidential meaning also often express other meanings such as dubitativity and admirativity, or may even express rhetorical questions. This work follows Friedman (1978; 1981; 1988) and others in considering these meanings to be the result of an evidential-like strategy: the expression of non-confirmativity. In Uzbek and Kazakh, as well as in many other Eurasian languages, …

Study Of Feature Selection Algorithms For Text-Categorization, Kandarp Dave

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis will discuss feature selection algorithms for text-categorization. Feature selection algorithms are very important, as they can make-or-break a categorization engine. The feature selection algorithms that will be discussed in this thesis are Document Frequency, Information Gain, Chi Squared, Mutual Information, NGL (Ng-Goh-Low) coefficient, and GSS (Galavotti-Sebastiani-Simi) coefficient . The general idea of any feature selection algorithm is to determine importance of words using some measure that can keep informative words, and remove non-informative words, which can then help the text-categorization engine categorize a document, D , into some category, C . These feature selection methods are explained, implemented, …

(Wp 2011-10) Obituary: Warren J. Samuels (1933-2011), John B. Davis

Economics Working Papers

This paper examines the research and career of the late Warren J. Samuels (1933-2011), an influential institutionalist economist in the Wisconsin John Commons tradition and well-known historian and methodologist of economics. It discusses four main positions Samuels developed and held regarding the history of economic thought as intellectual history, the theory of economic policy, methodological pluralism, and the invisible hand doctrine. Among the views considered are: his matrix approach to meaningfulness, his characterization of intellectual systems, his emphasis on the centrality of the social order, his theory of economic policy as a neglected subject, his discourse analysis of language, his …

Retaining Engineering Students Through A January Term German Immersion Study Tour, Sigrid Berka

Global Business Languages

Retention of engineering students is a national and international concern, since a globalizing world needs ever more culturally competent and technically adept graduates to fulfill the work force demands of companies operating globally. The data on retention of engineering students agrees that the freshman year is of critical importance; we fi nd that only about 40 to 50% of the students graduate with an engineering degree. The International Engineering Program (IEP) organizes a 10 to 14-day German Study Tour during January break, which is an effective retention tool for students enrolled in The University of Rhode Island’s demanding five-year dual …

On The Cover

Sci-Tech News

No abstract provided.

From The Editor, Abby Thorne

Sci-Tech News

No abstract provided.

Chemistry Division, William Armstrong

Sci-Tech News

No abstract provided.

Engineering Division, Kathryn Breininger

Sci-Tech News



Science-Technology Division, Joseph R. Kraus, Sarah K. Oelker, Emily Kasuto, Cynthia M. Cohen

Sci-Tech News

No abstract provided.

Beyond The Chemistry Web, Robert A. Buchanan

Sci-Tech News

No abstract provided.

Web Reviews: Qr Codes For Sci-Tech Libraries, Lisa Johnston

Sci-Tech News

QR Codes are popping up everywhere…classroom walls, conference posters, and even T-shirts (http://www.thinkgeek.com/stuff/41/09shirt.html). These “Quick Response” Codes are essentially 2D barcodes that work with your mobile phone’s built-in camera and a reader application ( like “Google Goggles”) to easily point to a web-site or application with one click…rather than typing in a full URL. They also can add a bit of excitement or tech savvy to your promotion materials, such as displays and signs in the library and are very easy to implement.

Recently a group of librarians in my library got together to brainstorm how we can …

Sci-Tech Book News Reviews, Susan Fingerman

Sci-Tech News

No abstract provided.

Using Principal Component Analysis For Early Fault Detection In Louisville Water Distribution System., Kevin M. Kastensmidt

Electronic Theses and Dissertations

This research dealt with the examination of Supervisory Control and Data Acquisition (SCADA) information of a water distribution system through Principal Component Analysis (PCA). PCA is a mathematical method to convert a set of possibly correlated data into a set of fewer variables called principal components. In a SCADA environment, possibly hundreds of data points such as booster pumps, storage tanks, pressure reducing valves, and others constantly provide operational statistics including water pressure, tank capacity, and more. This vast amount of data can be difficult to analyze in its entirety, especially to detect issues in the distribution system. PCA was …

Edge-Guarding Orthogonal Polyhedra, Nadia M. Benbernou, Erik D. Demaine, Martin L. Demaine, Anastasia Kurdia, Joseph O'Rourke, Godfried Toussaint, Jorge Urrutia, Giovanni Viglietta

Computer Science: Faculty Publications

We address the question: How many edge guards are needed to guard an orthogonal polyhedron of e edges, r of which are reflex? It was previously established [3] that e/12 are sometimes necessary and e/6 always suf- fice. In contrast to the closed edge guards used for these bounds, we introduce a new model, open edge guards (excluding the endpoints of the edge), which we argue are in some sense more natural in this context. After quantifying the relationship between closed and open edge guards, we improve the upper bound to show that, asymptotically, (11/72)e (open or closed) edge guards …

An Inertial Measurement System For Hand And Finger Tracking, Edward Nelson Henderson

Boise State University Theses and Dissertations

The primary Human Computer Interfaces (HCI) today are the keyboard and mouse. These interfaces do not facilitate a fluid flow of thought and intent from the operator to the computer. A computer mouse provides only 2 Degrees of Freedom (2DOF). Touch interfaces also provide 2DOF, but with multiple points, making the touch interface far more expressive. The hand has 6 Degrees of Freedom (6DOF)by itself. Combined with the motion of the fingers, the hand has the potential to represent a vast array of differing gestures. Hand gestures must be captured before they can be used as a HCI. Fortunately, advances …

Improved Heat Transfer Coefficient Data For Gas Turbine Cooling Channels Using Inverse Methods, Tommy Kurt Smith

Boise State University Theses and Dissertations

Determination of heat transfer in channel flow is important in many fields, with particular interest to this research being the cooling channels in gas turbine engine blades. Validation of gas turbine engine design is an essential step in their development process. Accurate knowledge of heat transfer that occurs within turbine blades during their operation allows for reduction of thermal stresses, increasing blade life and energy efficiency. Measuring heat flux, q, directly is difficult, so it is often calculated based on Newton‟s Law of Cooling.

Use of thermochromic liquid crystals (TLCs) in determining heat transfer coefficients h is common, as …

The Watchmaker Series, Christopher Michael Seelie

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Watchmaker Series celebrates and inquires into time as a biproduct of consciousness and practices the application of this notion in poetry. The series begins with the numeral poems, all of which relate directly to the theoretical and polemical aspects. Along the way, other poems with individual titles are interspersed to reflect or redirect the abstract considerations to more concrete subjects. Gradually, as the series progresses, the interacting and recurring associations meld theory and practice into a compositional whole.

The central notion that contemporary poetry is not a machine made of words but rather, like the watch that gives itself …

School Counselor Assignment In Secondary Schools: Replication And Extension, Jennifer L. Williamson

UNLV Theses, Dissertations, Professional Papers, and Capstones

Before school counselors can carry out the duties and responsibilities outlined as part of a comprehensive school counseling program, they must know which students they are responsible for helping. The topic of assigning students to school counselors has only recently been seen in the educational research arena in a study by Akos, Schuldt, and Walendin (2009). The current study attempts to replicate and extend the findings of Akos, Schuldt, and Walendin by addressing the questions of how secondary school counselors are assigned and what are their perceptions of their assignment. In addition, the study attempts to determine whether a particular …