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Full-Text Articles in Entire DC Network
On Mathematical Modeling, Nonlinear Properties And Stability Of Secondary Flow In A Dendrite Layer, D. N. Riahi
On Mathematical Modeling, Nonlinear Properties And Stability Of Secondary Flow In A Dendrite Layer, D. N. Riahi
Applications and Applied Mathematics: An International Journal (AAM)
This paper studies instabilities in the flow of melt within a horizontal dendrite layer with deformed upper boundary and in the presence or absence of rotation during the solidification of a binary alloy. In the presence of rotation, it is assumed that the layer is rotating about a vertical axis at a constant angular velocity. Linear and weakly nonlinear stability analyses provide results about various flow features such as the critical mode of convection, neutral stability curve, preferred flow pattern and the solid fraction distribution within the dendrite layer. The preferred shape of the deformed upper boundary of the layer, …
Predicting Magnetospheric Dynamics With A Coupled Sun‐To‐Earth Model: Challenges And First Results, V. G. Merkin, M. J. Owens, Harlan E. Spence, W. J. Hughes, J. M. Quinn
Predicting Magnetospheric Dynamics With A Coupled Sun‐To‐Earth Model: Challenges And First Results, V. G. Merkin, M. J. Owens, Harlan E. Spence, W. J. Hughes, J. M. Quinn
Physics & Astronomy
[1] Results from the first Sun-to-Earth coupled numerical model developed at the Center for Integrated Space Weather Modeling are presented. The model simulates physical processes occurring in space spanning from the corona of the Sun to the Earth's ionosphere, and it represents the first step toward creating a physics-based numerical tool for predicting space weather conditions in the near-Earth environment. Two 6- to 7-d intervals, representing different heliospheric conditions in terms of the three-dimensional configuration of the heliospheric current sheet, are chosen for simulations. These conditions lead to drastically different responses of the simulated magnetosphere-ionosphere system, emphasizing, on the one …
2007 Annual Conference Reports
The John Muir Newsletter, Winter 2007/2008, The John Muir Center For Environmental Studies
The John Muir Newsletter, Winter 2007/2008, The John Muir Center For Environmental Studies
Muir Center Newsletters (1981-2015)
Muir SLETTEB YfeRSnY OF THE PACIFIC, STOCKTON, CA Volume 18, Number 1 Winter 2007/20081 John Muir's World Tour (part VI) Introduction by W.R. Swagerty Director, John Muir Center In this, the sixth and final segment of John Muir's World Tour, 1903-1904, we complete his journey from March 2 to May 27, 1904 from open waters in the Tasman Sea to San Francisco. Muir continues writing in his Collin's Paragon Diary, 1904, purchased in Australia and reflecting the calendar for the Southern Hemisphere. This form of "journal" allowed the author to enter one page per day. If he needed more space, …
The Chat Room, Vol. 8, College Of Education And Professional Studies
The Chat Room, Vol. 8, College Of Education And Professional Studies
The Chat Room (CEPS Newsletter)
The Chat Room is the College of Education and Professional Studies newsletter. This is Volume 8, December 2007.
A New Family Of Pr Two Channel Filter Banks, Jian-Ao Lian
A New Family Of Pr Two Channel Filter Banks, Jian-Ao Lian
Applications and Applied Mathematics: An International Journal (AAM)
A new family of multidimensional dimensional (MD) perfect reconstruction (PR) two channel filter banks with finite impulse response (FIR) filters induced from systems of biorthogonal MD scaling functions and wavelets are introduced. One of the advantages of this construction is that the biorthogonal scaling functions and wavelets are easy to establish due to the interpolatory property of the scaling functions to start with. The other advantage is that all filters can be centrosymmetric or bi-linear phase. Examples of two dimensional (2D) bi-linear phase PR twochannel FIR filter banks will be demonstrated.
Computational Complexity Of Determining Which Statements About Causality Hold In Different Space-Time Models, Vladik Kreinovich, Olga Kosheleva
Computational Complexity Of Determining Which Statements About Causality Hold In Different Space-Time Models, Vladik Kreinovich, Olga Kosheleva
Departmental Technical Reports (CS)
Causality is one of the most fundamental notions of physics. It is therefore important to be able to decide which statements about causality are correct in different models of space-time. In this paper, we analyze the computational complexity of the corresponding deciding problems. In particular, we show that: for Minkowski space-time, the deciding problem is as difficult as the Tarski's decision problem for elementary geometry, while for a natural model of primordial space-time, the corresponding decision problem is of the lowest possible complexity among all possible spacetime models.
Acer Enews 12 December 2007, Acer
The Vine (2007-12)
The Vine, 1994-2008
The Vine was a successor to Reflections in Ink, published from 1994 to 2008. It transitioned from a mostly African American student perspective to a multi-cultural one.
The Development Of Regional Regression Equations For Flood Flow Estimates Of Ungauged Streams In The State Of Arkansas, Stephen Mccall
The Development Of Regional Regression Equations For Flood Flow Estimates Of Ungauged Streams In The State Of Arkansas, Stephen Mccall
Civil Engineering Undergraduate Honors Theses
The objective of this project is to improve the accuracy of the peak streamflow frequency estimates in ungauged streams by using a regionalization approach and the Bulletin 17B method of flood flow analysis. The entire state will be considered one region and the final results will be compared to previous studies done in the state. The data used will be the most up-to-date available from the USGS gauging stations around the state. This includes data from gauging stations that had less than 10 years of data when the last such study was conducted by Hodge & Tasker (1995). The data …
Interval Computations And Interval-Related Statistical Techniques: Tools For Estimating Uncertainty Of The Results Of Data Processing And Indirect Measurements, Vladik Kreinovich
Interval Computations And Interval-Related Statistical Techniques: Tools For Estimating Uncertainty Of The Results Of Data Processing And Indirect Measurements, Vladik Kreinovich
Departmental Technical Reports (CS)
In many practical situations, we only know the upper bound D on the (absolute value of the) measurement error d, i.e., we only know that the measurement error is located on the interval [-D,D]. The traditional engineering approach to such situations is to assume that d is uniformly distributed on [-D,D], and to use the corresponding statistical techniques. In some situations, however, this approach underestimates the error of indirect measurements. It is therefore desirable to directly process this interval uncertainty. Such "interval computations" methods have been developed since the 1950s. In this chapter, we provide a brief overview of related …
Recounting Determinants For A Class Of Hessenberg Matrices, Arthur T. Benjamin, Mark A. Shattuck
Recounting Determinants For A Class Of Hessenberg Matrices, Arthur T. Benjamin, Mark A. Shattuck
All HMC Faculty Publications and Research
We provide combinatorial interpretations for determinants which are Fibonacci numbers of several recently introduced Hessenberg matrices. Our arguments make use of the basic definition of the determinant as a signed sum over the symmetric group.
Teaching Hausman And Willig Using Mathematica, Matt Bogard
Teaching Hausman And Willig Using Mathematica, Matt Bogard
Library Faculty Publications
Analyzing consumer welfare from observable data, or empirical demand functions has been a very controversial issue in economics. One metric often used is deadweight loss from a tax or price increase. A classic debate in economic history regarding the appropriate methodology for measuring deadweight loss involves two papers published in the American Economic Review by Jerry Hausman and Robert Willig. In ‘Consumer’s Surplus Without Apology’ Willig contends that the error in approximating deadweight loss using the observable Marshallian demand curve is small for small price changes and an acceptable practice. Hausman argues in ‘Exact Consumer’s Surplus and Deadweight Loss’ that …
Department Of Biological Systems Engineering Newsletter, Volume 2, Issue 3, December 2007
Department Of Biological Systems Engineering Newsletter, Volume 2, Issue 3, December 2007
BSE Department Magazine
Contents:
New Tractor Test Track Dedication
From the Department Head
Awards
Meet the Faculty
Alumni News
Student News
Summer Graduations
Quarter-scale Tractor Competition
ASABE Student Branch
ASABE International Preprofessional Council
Distinguished Fellowship Awards
John and Louise Skala Fellowships
Researching Plant Sterols
Milton E. Mohr Fellowship in Agriculture
Scholarships and Ice Cream
100 Years As a University of Nebraska Department
Alumnus Profile
Career opportunities in food engineering
Congratulations
Comings and Goings
X-Rays From Magnetically Channeled Winds Of Ob Stars, In 'Magnetic Massive Stars', David H. Cohen
X-Rays From Magnetically Channeled Winds Of Ob Stars, In 'Magnetic Massive Stars', David H. Cohen
Physics & Astronomy Faculty Works
OB stars with strong radiation-driven stellar winds and large-scale magnetic fields generate strong and hard X-ray emission via the Magnetically Channeled Wind Shock (MCWS) mechanism. In this brief paper, I describe four separate X-ray diagnostics of the MCWS mechanism in OB stars, with applications to the prototype young O star, theta-1 Ori C.
Until We Fix The Labs And Fund Criminal Defendants: Fighting Bad Science With Storytelling , Brian J. Foley
Until We Fix The Labs And Fund Criminal Defendants: Fighting Bad Science With Storytelling , Brian J. Foley
Tulsa Law Review
No abstract provided.
The Future Of The Economic Analysis Of Law In Latin America: A Proposal For Model Codes, Juan Javier Del Granado, M. C. Mirow
The Future Of The Economic Analysis Of Law In Latin America: A Proposal For Model Codes, Juan Javier Del Granado, M. C. Mirow
Chicago-Kent Law Review
Nothing excites civilian lawyers and judges more than commissions for codification. Codification is more than an academic enterprise. Codification projects directly cut across the interface between law and life. ALACDE intends to harness this Latin American interest in codification to bring the economic approach to Latin America. A new-generation law and economics civil and commercial code will be a conscious project to restate Roman law's usefulness for coping with today's problems. Through law and economics, Roman law will renew itself. As a paradigmatic private-law system, Roman law is eminently amenable to a state-of-the-art fusion with law and economics. Sensitivity to …
X-Ray Emission From O Stars, David H. Cohen
X-Ray Emission From O Stars, David H. Cohen
Physics & Astronomy Faculty Works
Young O stars are strong, hard, and variable X-ray sources, properties which strongly affect their circumstellar and galactic environments. After ~1 Myr, these stars settle down to become steady sources of soft X-rays. I use high-resolution X-ray spectroscopy and MHD modeling to show that young O stars like theta-1 Ori C are well explained by the magnetically channeled wind shock scenario. After their magnetic fields dissipate, older O stars produce X-rays via shock heating in their unstable stellar winds. Here too I use X-ray spectroscopy and numerical modeling to confirm this scenario. In addition to elucidating the nature and cause …
Automatically Extract Information From Web Documents, Dipesh Sharma
Automatically Extract Information From Web Documents, Dipesh Sharma
Masters Theses & Specialist Projects
The Internet could be considered to be a reservoir of useful information in textual form — product catalogs, airline schedules, stock market quotations, weather forecast etc. There has been much interest in building systems that gather such information on a user's behalf. But because these information resources are formatted differently, mechanically extracting their content is difficult. Systems using such resources typically use hand-coded wrappers, customized procedures for information extraction. Structured data objects are a very important type of information on the Web. Such data objects are often records from underlying databases and displayed in Web pages with some fixed templates. …
The Influence Of Adolescents' Educational Aspirations And Religiosity On The Desire To Marry Among High School Seniors, Erica Scott
Masters Theses & Specialist Projects
The present study uses data from the 2004 Monitoring the Future Survey (MTF) to evaluate how twelfth grader's educational aspirations and religiosity influenced their desire to marry. Previous research indicates that education attained and increased religiosity increases the probability of marriage (Bumpass, Sweet, and Cherlin 1991; Goldstein and Kenney 2001; Sweeney 2002; Thornton, Axinn, and Teachman 1995). Exchange theory explains that higher levels of education increase one's odds in the marriage market, and the actual act of marriage is perceived as a "reward" to highly religious individuals (Becker 1973; Blau 1964; Edwards 1969; Friedman and Hechter 1988; Homans 1974). Results …
Commuting Analysis In A Small Metropolitan Area - A Case Study Of Bowling Green/Warren County, Kentucky, Caitlin Hagar
Commuting Analysis In A Small Metropolitan Area - A Case Study Of Bowling Green/Warren County, Kentucky, Caitlin Hagar
Masters Theses & Specialist Projects
In previous studies of urban commutes, little attention has been paid to commute patterns in smaller urban areas. In this study, the concept of "excess commute" (EC) is applied to the Bowling Green-Warren County Metropolitan Statistical Area (BGWCMSA) in Kentucky. EC quantifies the portion of commute distance explained by the overall spatial separation of jobs and households. Results in this thesis research show that approximately 65% of commute distance by persons driving alone in the study area can be explained by the physical locations of homes relative to job sites as well as the existing roadway network, leaving an EC …
Overcoming Global Ignorance: Developing Geographic Literacy In A World Regional Geography Course, Amy Seymour
Overcoming Global Ignorance: Developing Geographic Literacy In A World Regional Geography Course, Amy Seymour
Masters Theses & Specialist Projects
The most recent Roper Survey (2006), a study of geographic literacy among 18-to 24-year-olds, found that despite constant coverage of the war in Iraq since 2003, 63% of Americans surveyed could not find Iraq on a map. Similar shortcomings abound in the poll, pointing to what must be considered a "geographic illiteracy" among Americans. This national geographic illiteracy has global implications that range from the local to the global scale, including issues of politics, economics, foreign policy, environmental policy, and resource use to name just a few. How badly prepared, then, are students entering colleges and universities in terms of …
Sustainability Of Western Kentucky University: An Examination Of Campus Environmental Policies, Performance And Potential For Change, Christian Ryan-Downing
Sustainability Of Western Kentucky University: An Examination Of Campus Environmental Policies, Performance And Potential For Change, Christian Ryan-Downing
Masters Theses & Specialist Projects
Institutions of higher learning are in a pivotal position to address the environmental problems that global society faces now, but response to this challenge requires transformation in priorities and practices. Recognizing the impacts that universities have on the environment and the social and economic costs associated with these impacts, institutions of higher learning are changing policies and management to become more sustainable. Sustainability is defined by the World Commission on Environment and Development as "development that meets the needs of the present without compromising the ability of future generations to meet their own needs" (1987). To evaluate the environmental impacts …
Fuzzy Efficiency Measure With Fuzzy Production Possibility Set, T. Allahviranloo, F. Hosseinzade Lotfi, M. Adabitabar Firozja
Fuzzy Efficiency Measure With Fuzzy Production Possibility Set, T. Allahviranloo, F. Hosseinzade Lotfi, M. Adabitabar Firozja
Applications and Applied Mathematics: An International Journal (AAM)
The existing data envelopment analysis (DEA) models for measuring the relative efficiencies of a set of decision making units (DMUs) using various inputs to produce various outputs are limited to crisp data. The notion of fuzziness has been introduced to deal with imprecise data. Fuzzy DEA models are made more powerful for applications. This paper develops the measure of efficiencies in input oriented of DMUs by envelopment form in fuzzy production possibility set (FPPS) with constant return to scale.
A General Boosting Method And Its Application To Learning Ranking Functions For Web Search, Zhaohui Zheng, Hongyuan Zha, Tong Zhang, Olivier Chapelle, Keke Chen, Gordon Sun
A General Boosting Method And Its Application To Learning Ranking Functions For Web Search, Zhaohui Zheng, Hongyuan Zha, Tong Zhang, Olivier Chapelle, Keke Chen, Gordon Sun
Kno.e.sis Publications
We present a general boosting method extending functional gradient boosting to optimize complex loss functions that are encountered in many machine learning problems. Our approach is based on optimization of quadratic upper bounds of the loss functions which allows us to present a rigorous convergence analysis of the algorithm. More importantly, this general framework enables us to use a standard regression base learner such as decision trees for fitting any loss function. We illustrate an application of the proposed method in learning ranking functions for Web search by combining both preference data and labeled data for training. We present experimental …
Systematic Reviews Of Animal Experiments Demonstrate Poor Human Clinical And Toxicological Utility, Andrew Knight
Systematic Reviews Of Animal Experiments Demonstrate Poor Human Clinical And Toxicological Utility, Andrew Knight
Experimentation Collection
The assumption that animal models are reasonably predictive of human outcomes provides the basis for their widespread use in toxicity testing and in biomedical research aimed at developing cures for human diseases. To investigate the validity of this assumption, the comprehensive Scopus biomedical bibliographic databases were searched for published systematic reviews of the human clinical or toxicological utility of animal experiments. In 20 reviews in which clinical utility was examined, the authors concluded that animal models were either significantly useful in contributing to the development of clinical interventions, or were substantially consistent with clinical outcomes, in only two cases, one …
Global Vor Gain Adaptation During Near Fixation To Foveal Targets, Jason A. Williams, Bruce Bridgeman, Tadg Woods, Robert Welch
Global Vor Gain Adaptation During Near Fixation To Foveal Targets, Jason A. Williams, Bruce Bridgeman, Tadg Woods, Robert Welch
Psychology and Child Development
Long-term rotational vestibulo-ocular (VOR) adaptation occurs during systematic dysmetria between visual and vestibular afferents, adjusting eye-rotation angular velocity to re-establish retinal stability of the visual field. Due to translational motion of the eyes during head rotation, VOR gain is higher when fixating near objects. The current study measures VOR in humans before and after 6min of exposure to a foveal near-target during sinusoidal whole-body rotation at 0.45 Hz. All of six participants showed post-exposure increases in open-loop VOR gain after fixating near targets, demonstrating a mean modulation increase of open-loop VOR gain from 0.86 before adaptation to 1.2 after adaptation. …
Markov-Based Lane Positioning Using Intervehicle Communication, Thanh-Son Dao, Keith Yu Kit Leung, Christopher M. Clark, Jan Paul Huissoon
Markov-Based Lane Positioning Using Intervehicle Communication, Thanh-Son Dao, Keith Yu Kit Leung, Christopher M. Clark, Jan Paul Huissoon
Computer Science and Software Engineering
The majority of today's navigation techniques for intelligent transportation systems use global positioning systems (GPS) that can provide position information with bounded errors. However, due to the low accuracy that is experienced with standard GPS, it is difficult to determine a vehicle's position at lane level. Using a Markov-based approach based on sharing information among a group of vehicles that are traveling within communication range, the lane positions of vehicles can be found. The algorithm's effectiveness is shown in both simulations and experiments with real data.