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Articles 1 - 30 of 87
Full-Text Articles in Physical Sciences and Mathematics
5. Burton Carl Anderson, Otto Vogl
5. Burton Carl Anderson, Otto Vogl
Emeritus Faculty Author Gallery
No abstract provided.
An Excursion From Enumerative Geometry To Solving Systems Of Polynomial Equations With Macaulay 2, Frank Sottile
An Excursion From Enumerative Geometry To Solving Systems Of Polynomial Equations With Macaulay 2, Frank Sottile
Mathematics and Statistics Department Faculty Publication Series
Solving a system of polynomial equations is a ubiquitous problem in the applications of mathematics. Until recently, it has been hopeless to find explicit solutions to such systems, and mathematics has instead developed deep and powerful theories about the solutions to polynomial equations. Enumerative Geometry is concerned with counting the number of solutions when the polynomials come from a geometric situation and Intersection Theory gives methods to accomplish the enumeration. We use Macaulay 2 to investigate some problems from enumerative geometry, illustrating some applications of symbolic computation to this important problem of solving systems of polynomial equations. Besides enumerating solutions …
6. Ichitaro Uematsu, Otto Vogl, Teiji Tsuruta, Yoshiko Uematsu
6. Ichitaro Uematsu, Otto Vogl, Teiji Tsuruta, Yoshiko Uematsu
Emeritus Faculty Author Gallery
No abstract provided.
The Two Micron All-Sky Survey: Removing The Infrared Foreground, John E. Gizis, Michael F. Skrutskie
The Two Micron All-Sky Survey: Removing The Infrared Foreground, John E. Gizis, Michael F. Skrutskie
Astronomy Department Faculty Publication Series
We introduce the properties of the Two Micron All-Sky Survey (2MASS) survey for IAU Symposium 204. 2MASS is a near-infrared survey of the entire sky characterized by high reliability and completeness. Catalogs and images for 47% of the sky are now available online. This data release has been used by Wright (2000) and Cambr´esy et al. (2000) to subtract the stellar foreground at 1.25 and 2.2 microns from COBE DIRBE data, revealing the cosmological near-infrared background.
8. Paolo Corradini, Otto Vogl, Brigitta Griesbeck Corradini
8. Paolo Corradini, Otto Vogl, Brigitta Griesbeck Corradini
Emeritus Faculty Author Gallery
No abstract provided.
9. Oskar Friedrich Olaj, Otto Vogl
9. Oskar Friedrich Olaj, Otto Vogl
Emeritus Faculty Author Gallery
No abstract provided.
10. Dietrich Braun, Otto Vogl
11. Binglin He, Otto Vogl, Frank C. Ho (He Zhenchi)
11. Binglin He, Otto Vogl, Frank C. Ho (He Zhenchi)
Emeritus Faculty Author Gallery
No abstract provided.
Research Ethics: An Introduction, Tom Regan
Research Ethics: An Introduction, Tom Regan
Ethics in Science and Engineering National Clearinghouse
Research Ethics: an Introduction focuses both on how Responsible Conduct of Research (RCR) fits into the field of applied ethics and on procedures for making decisions that have a moral component. Tom Regan presents “Morally Relevant Questions: A Check List” with the central theme of balancing conflicting obligations. We expand this discussion with several classic resources by well known experts in research ethics that articulate critical topics. We present a Case Study from The Association for Practical and Professional Ethics. We consider the question of professional codes and think about the toll of making the right decision. In the Additional …
The Mentoring Of Graduate Students, Margaret King
The Mentoring Of Graduate Students, Margaret King
Ethics in Science and Engineering National Clearinghouse
The Mentoring of Graduate Students presents basic issues that face both mentors and their protégés. Margaret King, the Graduate School, is our faculty guide for this module. We focus on some of the ethical values most central to the mentoring process such as justice and the idea of contracts. One of the challenges of the mentoring experience is that it involves rules and practices both tangible and intangible. Dr. King explores some of these intangibles- Right Attention, Right Balance, Right Empowerment and Right Boundaries- in the central essay and we focus on them additionally in our Central Theme section. We …
Responsible Authorship And Peer Review, James Wilson
Responsible Authorship And Peer Review, James Wilson
Ethics in Science and Engineering National Clearinghouse
Responsible Authorship and Peer Review presents the basic issues facing researchers at the publication stage of research. We focus on some of the ethical values particularly relevant to publication: honesty, objectivity, trust, collegiality, and the problem of power differentials. We present Jim Wilson’s Guidelines for Authors and the Office of Research Integrity (ORI) Guidelines: ORI has also posted extensive materials on authorship and peer review issues. We present a Case Study from The Association for Practical and Professional Ethics. We consider the challenges of peer review, especially in terms of innovation in research. In the Resources section, you will find …
Professional Responsibility And Codes Of Conduct, Nell Kriesberg
Professional Responsibility And Codes Of Conduct, Nell Kriesberg
Ethics in Science and Engineering National Clearinghouse
Professional Responsibility and Codes of Conduct presents an overview of major issues concerning professionalism as they relate to the Responsible Conduct of Research (RCR). Joe Herkert emphasizes both the micro (between individuals) and macro (between professionals and society) ethical dimensions of professional responsibility and codes of conduct. We compare ethical codes with aspects of moral theory, expanding the discussion with some of the classical readings for this topic. We present a case study from the Association for Practical and Professional Ethics. We consider the complex issue of whistle-blowing. We close with a sampling of additional resources.
Human Subjects In Research, Matt Ronning
Human Subjects In Research, Matt Ronning
Ethics in Science and Engineering National Clearinghouse
Human Subjects in Research presents basic ethical issues that face researchers when doing work with human participants. Matt Ronning, Assistant Vice Chancellor for Research Administration Sponsored Programs and Regulatory Compliance, (SPARCS) is our guide for this module. In the Overview section we review chapters from two well known textbooks on Research Ethics. In the Applied Ethics section we focus on the consent form as a contract and comment upon the recurring topics of Justice and Honesty as they apply particularly to human subjects. In the Central Theme section we review institutional guidelines, both at the national and institutional level, utilizing …
Rightdoing And Misconduct In Research, Rebeca Rufty, Nell Kriesberg
Rightdoing And Misconduct In Research, Rebeca Rufty, Nell Kriesberg
Ethics in Science and Engineering National Clearinghouse
Rightdoing and Research presents the major issues concerning research integrity and misconduct; we intend this to be more of a reference handbook than the other modules in the series. Our faculty expert for this module is Becky Rufty, the Graduate School. Concepts of Rightdoing and integrity are discussed, and we expand the discussion with several key articles in the evolution of research ethics literature. Ethical concerns about ambiguity and trust are explored, as is the idea of micro and Macroethics. We focus on the resources at NC State University for promoting research integrity, as well as national guidelines. We present …
Intellectual Property - Copyright, Peggy Hoon
Intellectual Property - Copyright, Peggy Hoon
Ethics in Science and Engineering National Clearinghouse
The goal of this module is to present the major issues surrounding intellectual property (IP): rather than attempt to discuss all four types of IP, trademarks, trade secrets, patents and copyright, we will focus on copyright. Our Faculty Expert for this module is Peggy Hoon, Director of the Scholarly Communications Center, NC State University. The Overview section presents two chapters from two well known textbooks on research ethics. In the Applied Ethics portion we discuss the idea of the labor contract and the idea of the Intellectual Commons to clarify some of the more complex issues. In the Central Theme …
Responsible Use Of Statistical Methods, Larry Nelson, Charles Proctor, Cavell Brownie
Responsible Use Of Statistical Methods, Larry Nelson, Charles Proctor, Cavell Brownie
Ethics in Science and Engineering National Clearinghouse
Responsible Use of Statistical Methods focuses on good statistical practices. In the Introduction we distinguish between two types of activities; one, those involving the study design and protocol (a priori) and two, those actions taken with the results (post hoc.) We note that right practice is right ethics, the distinction between a mistake and misconduct and emphasize the importance of how the central hypothesis is stated. The Central Essay, Identification of Outliers in a Set of Precision Agriculture Experimental Data by Larry A. Nelson, Charles H. Proctor and Cavell Brownie, is a good paper to study. The Applied Ethics section …
Science And The Media: Ethics Issues, Joann Burkholder
Science And The Media: Ethics Issues, Joann Burkholder
Ethics in Science and Engineering National Clearinghouse
This module addresses the complex interface of research and the media; this interface necessarily involves issues of public policy, however, for the purposes of this module we will focus on media issues and touch on public policy in the Thinking Outside the Box section. For simplicity, when we refer to “media” we are speaking of journalists covering the science beat. In the Introduction we talk about the special collaboration between the media and the researcher and the challenges both face in communicating science to the public at large. We note the ethical component inherent in all communication and include quotations …
Stellar Populations In The Large Magellanic Cloud From 2mass, Sergei Nikolaev, Martin D. Weinberg
Stellar Populations In The Large Magellanic Cloud From 2mass, Sergei Nikolaev, Martin D. Weinberg
Astronomy Department Faculty Publication Series
We present a morphological analysis of the feature-rich 2MASS LMC colormagnitude diagram, identifying Galactic and LMC populations and estimating the density of LMC populations alone. We also present the projected spatial distributions of various stellar populations. The conditions that prevailed when 2MASS observed the LMC provided 10s limiting sensitivity for J <∼ 16.3, H <∼ 15.3, Ks <∼ 14.7. Major populations are identified based on matching morphological features of the color-magnitude diagram with expected positions of known populations, isochrone fits, and analysis of the projected spatial distributions. 2MASS has detected a significant population of asymptotic giant branch (AGB) stars (>∼ 104 sources) and obscured AGB stars ( >∼ 2×103 sources). The LMC populations along the first-ascent red giant branch (RGB) and AGB are quantified. Comparison of the giant luminosity functions in the bar and the outer regions of the LMC shows that both luminosity functions appear consistent with …
C32, A Young Star Cluster In Ic 1613, Ted K. Wyder, Paul W. Hodge, Andrew Cole
C32, A Young Star Cluster In Ic 1613, Ted K. Wyder, Paul W. Hodge, Andrew Cole
Astronomy Department Faculty Publication Series
The Local Group irregular galaxy IC 1613 has remained an enigma for many years because of its apparent lack of star clusters. We report the successful search for clusters among several of the candidate objects identified many years ago on photographic plates. We have used a single HST WFPC2 pointing and a series of images obtained with the WIYN telescope under exceptional seeing conditions, examining a total of 23 of the previously published candidates. All but six of these objects were found to be either asterisms or background galaxies. Five of the six remaining candidates possibly are small, sparse clusters …
Equation-Based Congestion Control For Unicast Applications, Jitendra Padhye
Equation-Based Congestion Control For Unicast Applications, Jitendra Padhye
Computer Science Department Faculty Publication Series
This paper proposes a mechanismfor equation-based congestion control for unicast traffic. Most best-effort traffic in the current Internet is well-served by the dominant transport protocol TCP. However, traffic such as best-effort unicast streaming multimedia could find use for a TCP-friendly congestion control mechanism that refrains from reducing the sending rate in half in response to a single packet drop. With our mechanism, the sender explicitly adjusts its sending rate as a function of the measured rate of loss events, where a loss event consists of one or more packets dropped within a single round-trip time. We use both simulations and …
Large Deviation Principles And Complete Equivalence And Nonequivalence Results For Pure And Mixed Ensembles, Rs Ellis, K Haven, B Turkington
Large Deviation Principles And Complete Equivalence And Nonequivalence Results For Pure And Mixed Ensembles, Rs Ellis, K Haven, B Turkington
Mathematics and Statistics Department Faculty Publication Series
We consider a general class of statistical mechanical models of coherent structures in turbulence, which includes models of two-dimensional fluid motion, quasi-geostrophic flows, and dispersive waves. First, large deviation principles are proved for the canonical ensemble and the microcanonical ensemble. For each ensemble the set of equilibrium macrostates is defined as the set on which the corresponding rate function attains its minimum of 0. We then present complete equivalence and nonequivalence results at the level of equilibrium macrostates for the two ensembles. Microcanonical equilibrium macrostates are characterized as the solutions of a certain constrained minimization problem, while canonical equilibrium macrostates …
Sixth Pacific Polymer Conference, Ppc-6 Guangzhou, China, Otto Vogl, Xu Mao
Sixth Pacific Polymer Conference, Ppc-6 Guangzhou, China, Otto Vogl, Xu Mao
Emeritus Faculty Author Gallery
No abstract provided.
K ->Pi Pi Phenomenology In The Presence Of Electromagnetism, V Cirigliano, Jf Donoghue, Eugene Golowich
K ->Pi Pi Phenomenology In The Presence Of Electromagnetism, V Cirigliano, Jf Donoghue, Eugene Golowich
Physics Department Faculty Publication Series
We describe the influence of electromagnetism on the phenomenology of $K \to \pi\pi$ decays. This is required because the present data were analyzed without inclusion of electromagnetic radiative corrections, and hence contain several ambiguities and uncertainties which we describe in detail. Our presentation includes a full description of the infrared effects needed for a new experimental analysis. It also describes the general treatment of final state interaction phases, needed because Watson's theorem is no longer valid in the presence of electromagnetism. The phase of the isospin-two amplitude ${\cal A}_2$ may be modified by $50 \to 100\%$. We provide a tentative …
Dimension-Eight Operators In The Weak Ope, V Cirigliano, Jf Donoghue, Eugene Golowich
Dimension-Eight Operators In The Weak Ope, V Cirigliano, Jf Donoghue, Eugene Golowich
Physics Department Faculty Publication Series
We argue that there is a potential flaw in the standard treatment of weak decay amplitudes, including that of ǫ′/ǫ. We show that (contrary to conventional wisdom) dimension-eight operators do contribute to weak amplitudes, at order GFαs and without 1/M2W suppression. We demonstrate the existence of these operators through the use of a simple weak hamiltonian. Their contribution appears in different places depending on which scheme is adopted in performing the OPE. If one performs a complete separation of short and long distance physics within a cutoff scheme, dimension-eight operators occur in the weak hamiltonian at order GFαs/μ2, μ being …
Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry With In-Atomizer Trapping For The Determination Of Lead In Calcium Supplements, Jf Tyson, Ri Ellis, G Carnrick, F Fernandez
Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry With In-Atomizer Trapping For The Determination Of Lead In Calcium Supplements, Jf Tyson, Ri Ellis, G Carnrick, F Fernandez
Chemistry Department Faculty Publication Series
No abstract provided.
Flow Injection Solid Phase Extraction With Chromosorb 102: Determination Of Lead In Soil And Waters By Flame Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Flow Injection Solid Phase Extraction With Chromosorb 102: Determination Of Lead In Soil And Waters By Flame Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
High-Performance Liquid Chromatography Of Selenium Compounds Utilizing Perfluorinated Carboxylic Acid Ion-Pairing Agents And Inductively Coupled Plasma And Electrospray Ionization Mass Spectrometric Detection, M Kotrebai, Jf Tyson, E Block, Pc Uden
High-Performance Liquid Chromatography Of Selenium Compounds Utilizing Perfluorinated Carboxylic Acid Ion-Pairing Agents And Inductively Coupled Plasma And Electrospray Ionization Mass Spectrometric Detection, M Kotrebai, Jf Tyson, E Block, Pc Uden
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Cadmium By Flow Injection-Chemical Vapor Generation-Atomic Absorption Spectrometry, C Vargas-Razo, Jf Tyson
Determination Of Cadmium By Flow Injection-Chemical Vapor Generation-Atomic Absorption Spectrometry, C Vargas-Razo, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Trace Elements In Marine Plankton By Inductively Coupled Plasma Mass Spectrometry (Icp-Ms), Z Arslan, N Ertas, Jf Tyson, Pc Uden, Er Denoyer
Determination Of Trace Elements In Marine Plankton By Inductively Coupled Plasma Mass Spectrometry (Icp-Ms), Z Arslan, N Ertas, Jf Tyson, Pc Uden, Er Denoyer
Chemistry Department Faculty Publication Series
No abstract provided.
Statistical Mechanics Of A Discrete Nonlinear System, K Rasmussen, T Cretegny, Pg Kevrekidis
Statistical Mechanics Of A Discrete Nonlinear System, K Rasmussen, T Cretegny, Pg Kevrekidis
Mathematics and Statistics Department Faculty Publication Series
Statistical mechanics of the discrete nonlinear Schrödinger equation is studied by means of analytical and numerical techniques. The lower bound of the Hamiltonian permits the construction of standard Gibbsian equilibrium measures for positive temperatures. Beyond the line of T = ∞, we identify a phase transition through a discontinuity in the partition function. The phase transition is demonstrated to manifest itself in the creation of breatherlike localized excitations. Interrelation between the statistical mechanics and the nonlinear dynamics of the system is explored numerically in both regimes.