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Articles 1 - 30 of 34

Full-Text Articles in Physical Sciences and Mathematics

Algal Biomass As A Binding Agent For The Densification Of Miscanthus, Sunil Thapa, Daniel B. Johnson, Peter Ping Liu, Thomas Canam Feb 2015

Algal Biomass As A Binding Agent For The Densification Of Miscanthus, Sunil Thapa, Daniel B. Johnson, Peter Ping Liu, Thomas Canam

Thomas Canam

Purpose: Lignocellulosic biomass has been regarded as an important future energy source due to its excessive availability; however, the wide application of this material for many applications is restricted by the high costs associated with densification, transportation, thermo-chemical pretreatment and conversion. In order to increase the density of lignocellulosic biomass, it is typically compressed into pellets or briquettes. This frequently requires the addition of additives, which may negatively impact the economics of the process. Environmentally-friendly binding agents that can be obtained inexpensively are therefore desirable. This study examines the change in physicochemical properties of densified Miscanthus straw where algae were …

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Extracellular Gluco-Oligosaccharide Degradation By Caulobacter Crescentus, Gerald N. Presley, Matthew J. Payea, Logan R. Hurst, Annie E. Egan, Brandon S. Martin, Gopal R. Periyannan Mar 2014

Extracellular Gluco-Oligosaccharide Degradation By Caulobacter Crescentus, Gerald N. Presley, Matthew J. Payea, Logan R. Hurst, Annie E. Egan, Brandon S. Martin, Gopal R. Periyannan

Gopal R. Periyannan

The oligotrophic bacterium Caulobacter crescentus has the ability to metabolize various organic molecules, including plant structural carbohydrates, as a carbon source. The nature of β-glucosidase (BGL)-mediated gluco-oligosaccharide degradation and nutrient transport across the outer membrane in C. crescentus was investigated. All gluco-oligosaccharides tested (up to celloheptose) supported growth in M2 minimal media but not cellulose or CM-cellulose. The periplasmic and outer membrane fractions showed highest BGL activity, but no significant BGL activity was observed in the cytosol or extracellular medium. Cells grown in cellobiose showed expression of specific BGLs and TonB-dependent receptors (TBDRs). Carbonyl cyanide 3-chlorophenylhydrazone lowered the rate of …

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A Gentle Introduction To Pythontex, Andrew Mertz, William A. Slough Jan 2013

A Gentle Introduction To Pythontex, Andrew Mertz, William A. Slough

William A. Slough

No abstract provided.

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High-Pressure Cryogelation Of Nanosilica And Surface Properties Of Cryosilicas, V M. Gun'ko, V V. Turov, V I. Zarko, G P. Prykhod'ko, O S. Remez, R Leboda, J Skubiszewska-Zieba, E M. Pahklov, Jonathan Blitz Jan 2013

High-Pressure Cryogelation Of Nanosilica And Surface Properties Of Cryosilicas, V M. Gun'ko, V V. Turov, V I. Zarko, G P. Prykhod'ko, O S. Remez, R Leboda, J Skubiszewska-Zieba, E M. Pahklov, Jonathan Blitz

Jonathan Blitz

Silica cryogels (cryosilicas) in a powder state were synthesized with different concentrations of fumed silica A-300 (CA-300 = 5-20 wt.%), sonicated in aqueous suspension, then frozen at -14 oC at different pressures in a high-pressure stainless steel reactor (a freezing bomb), and dried in air at room temperature. To analyze the effects of low temperature and high pressure, samples were also prepared at -14 oC or room temperature and standard pressure. The structural and adsorption properties of the powder materials were studied using nitrogen adsorption, high-resolution transmission electron microscopy, infrared spectroscopy, thermogravimetry, low-temperature 1H NMR spectroscopy and thermally stimulated depolarization …

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Symmetric Random Walks On Homeo+(R), B. Deroin, V. Klepstyn, A. Navas, Kamlesh Parwani Jan 2013

Symmetric Random Walks On Homeo+(R), B. Deroin, V. Klepstyn, A. Navas, Kamlesh Parwani

Kamlesh Parwani

We study symmetric random walks on finitely generated groups of orientation-preserving homeomorphisms of the real line. We establish an oscillation property for the induced Markov chain on the line that implies a weak form of recurrence. Except for a few special cases, which can be treated separately, we prove a property of "global stability at a finite distance": roughly speaking, there exists a compact interval such that any two trajectories get closer and closer whenever one of them returns to the compact interval. The probabilistic techniques employed here lead to interesting results for the study of group actions on the …

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Microwave, Infrared And Raman Spectra, R0 Structural Parameters, Ab Initio Calculations And Vibrational Assignment Of 1-Fluoro-1-Silacyclopentanea), James R. Durig, Savitha S. Panikar, Daniel A. Obenchain, Brandon J. Bills, Patrick M. Lohan, Rebecca A. Peebles, Sean A. Peebles, Peter Groner, Gamil A. Guirgis, Michael D. Johnston Jan 2012

Microwave, Infrared And Raman Spectra, R0 Structural Parameters, Ab Initio Calculations And Vibrational Assignment Of 1-Fluoro-1-Silacyclopentanea), James R. Durig, Savitha S. Panikar, Daniel A. Obenchain, Brandon J. Bills, Patrick M. Lohan, Rebecca A. Peebles, Sean A. Peebles, Peter Groner, Gamil A. Guirgis, Michael D. Johnston

Sean A. Peebles

The microwave spectrum (6500–18 500 MHz) of 1-fluoro-1-silacyclopentane, c-C4H8SiHF has been recorded and 87 transitions for the 28Si, 29Si, 30Si, and 13C isotopomers have been assigned for a single conformer. Infrared spectra (3050-350 cm−1) of the gas and solid and Raman spectrum (3100-40 cm−1) of the liquid have also been recorded. The vibrational data indicate the presence of a single conformer with no symmetry which is consistent with the twist form. Ab initio calculations with a variety of basis sets up to MP2(full)/aug-cc-pVTZ predict the envelope-axial and envelope-equatorial conformers to be saddle points with nearly the same energies but much …

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The Dirty “S” Word: Innovative Teaching Techniques For Counselor Educators Facilitating Learning In Statistics And Research, Rebecca L. Tadlock-Marlo, Megan Michalak Jan 2012

The Dirty “S” Word: Innovative Teaching Techniques For Counselor Educators Facilitating Learning In Statistics And Research, Rebecca L. Tadlock-Marlo, Megan Michalak

Rebecca L Tadlock-Marlo

Innovative pedagogy will be presented and discussed to help make research a less painful class to both teach and learn. Foci include teaching methods, potential assignments, and suggestions for activities to help facilitate a more fluid learning process for counselors. Attendees will explore aspects of helping students overcome their fear of both statistics and research.

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A Picture Is Worth 972 Words: The Old, Red Barn, Chris Laingen Jan 2011

A Picture Is Worth 972 Words: The Old, Red Barn, Chris Laingen

Chris Laingen

No abstract provided.

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Historic And Contemporary Trends Of The Conservation Reserve Program And Ring-Necked Pheasants In South Dakota, Chris Laingen Jan 2011

Historic And Contemporary Trends Of The Conservation Reserve Program And Ring-Necked Pheasants In South Dakota, Chris Laingen

Chris Laingen

Over the past century, the interactions between agricultural land use and government cropland retirement programs have affected pheasant population change. Two government land retirement programs that returned croplands to grasslands, Soil Bank in the 1960s and the current Conservation Reserve Program (CRP), help to illustrate these connections. From 2007 to 2010, South Dakota lost 41% of its CRP lands and experienced an 18% decline in pheasants per mile. However, because of where CRP expirations have occurred and where pheasant populations are found , some regional variability is seen. Western South Dakota (Region 1) had an 80% increase in pheasants per …

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Adding Another Notch To America’S Corn Belt, Chris Laingen Jan 2011

Adding Another Notch To America’S Corn Belt, Chris Laingen

Chris Laingen

No abstract provided.

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Lattice Thermal Conductivity Of Freestanding Gallium Nitride Nanowires, Jie Zou Jan 2010

Lattice Thermal Conductivity Of Freestanding Gallium Nitride Nanowires, Jie Zou

Jie Zou

aip Publishers Publications Topics | Librarians Authors Your access is provided by: Eastern Illinois University Register to create your user account, or sign in if you have an existing account Additional sign in Sign in via Shibboleth/Athens My cart Export citations Add to my favorites Recommend to library Subscribe to email alerts Submit an article Reprints & Permissions Subscribe to RSS Access Key Free Content Open Access Content Subscribed Content Free Trial Content Home > Publishers > AIP Publishing > Journal of Applied Physics > Volume 108, Issue 3 > Article banner image F Lattice thermal conductivity of freestanding gallium nitride nanowires Download PDF Jie …

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A Sketch-Based Language For Representing Uncertainty In The Locations Of Origin Of Herbarium Specimens, Barry J. Kronenfeld, Andrew Weeks Jan 2010

A Sketch-Based Language For Representing Uncertainty In The Locations Of Origin Of Herbarium Specimens, Barry J. Kronenfeld, Andrew Weeks

Barry J. Kronenfeld

Uncertainty fields have been suggested as an appropriate model for retrospective georeferencing of herbarium specimens. Previous work has focused only on automated data capture methods, but techniques for manual data specification may be able to harness human spatial cognition skills to quickly interpret complex spatial propositions. This paper develops a formal modeling language by which location uncertainty fields can be derived from manually sketched features. The language consists of low-level specification of critical probability isolines from which a surface can be uniquely derived, and high-level specification of features and predicates from which low-level isolines can be derived. In a case …

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Harmonic Functions On R-Covered Foliations And Group Actions On The Circle, Sergio Fenley, Renato Feres, Kamlesh Parwani Jul 2009

Harmonic Functions On R-Covered Foliations And Group Actions On The Circle, Sergio Fenley, Renato Feres, Kamlesh Parwani

Kamlesh Parwani

Let (M,F) be a compact codimension-one foliated manifold whose leaves are equipped with Riemannian metrics, and consider continuous functions on M that are harmonic along the leaves of F. If every such function is constant on leaves we say that (M,F) has the Liouville property. Our main result is that codimension-one foliated bundles over compact negatively curved manifolds satisfy the Liouville property. Related results for R-covered foliations, as well as for discrete group actions and discrete harmonic functions, are also established.

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A Plotless Density Estimator Based On The Asymptotic Limit Of Ordered Distance Estimation Values, Barry J. Kronenfeld Jan 2009

A Plotless Density Estimator Based On The Asymptotic Limit Of Ordered Distance Estimation Values, Barry J. Kronenfeld

Barry J. Kronenfeld

Estimation of tree density from point-tree distances is an attractive option for quick inventory of new sites, but estimators that are unbiased in clustered and dispersed situations have not been found. Noting that bias of an estimator derived from distances to the kth nearest neighbor from a random point tends to decrease with increasing k, a method is proposed for estimating the limit of an asymptotic function through a set of ordered distance estimators. A standard asymptotic model is derived from the limiting case of a clustered distribution. The proposed estimator is evaluated against 13 types of simulated generating processes, …

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A Tikz Tutorial: Generating Graphics In The Spirit Of Tex, Andrew Mertz, William Slough Jan 2009

A Tikz Tutorial: Generating Graphics In The Spirit Of Tex, Andrew Mertz, William Slough

Andrew Mertz

TikZ is a system which can be used to specify graphics of very high quality. For example, accurate place- ment of picture elements, use of TEX fonts, ability to incorporate mathematical typesetting, and the possi- bility of introducing macros can be viewed as positive factors of this system. The syntax uses an amal- gamation of ideas from METAFONT, METAPOST, PSTricks, and SVG, allowing its users to \program" their desired graphics. The latest revision to TikZ introduces many new features to an already feature- packed system, as evidenced by its 560-page user manual. Here, we present a tutorial overview of this …

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The Two Covering Radius Of The Two Error Correcting Bch Code, Andrew Klapper, Andrew Mertz Jan 2009

The Two Covering Radius Of The Two Error Correcting Bch Code, Andrew Klapper, Andrew Mertz

Andrew Mertz

The m-covering radii of codes are natural generalizations of the covering radii of codes. In this paper we analyze the 2-covering radii of double error correcting BCH code.

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Calculation Of Phonon Dispersion In Semiconductor Nanostructures: An Undergraduate Computational Project, Jie Zou Jan 2008

Calculation Of Phonon Dispersion In Semiconductor Nanostructures: An Undergraduate Computational Project, Jie Zou

Jie Zou

This paper discusses an undergraduate research project that involves the numerical calculation of phonon dispersion in semiconductor nanostructures. Phonon dispersion is calculated in the elastic continuum approximation by applying a finite-difference method to solving the elastic wave equation with boundary conditions. Students did simulations for two nanostructures: a free-standing GaN thin film and a free-standing AlN/GaN/AlN heterostructure. A comparison of these two structures helps students understand the effect of boundary conditions on the nature of the phonon dispersion. The project is related to current research in phonon thermal transport in semiconductor nanostructures and nanodevices.

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C^1 Actions Of The Mapping Class Group On The Circle, Kamlesh Parwani Jan 2008

C^1 Actions Of The Mapping Class Group On The Circle, Kamlesh Parwani

Kamlesh Parwani

Let S be a connected orientable surface with finitely many punctures, finitely many boundary components, and genus at least 6. Then any C^1 action of the mapping class group of S on the circle is trivial. The techniques used in the proof of this result permit us to show that products of Kazhdan groups and certain lattices cannot have C^1 faithful actions on the circle. We also prove that for n > 5, any C^1 action of Aut(F_n) or Out(F_n) on the circle factors through an action of Z/2Z.

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How Human And Natural Driving Forces Affect Pheasants And Pheasant Hunting In South Dakota, Chris Laingen Jan 2008

How Human And Natural Driving Forces Affect Pheasants And Pheasant Hunting In South Dakota, Chris Laingen

Chris Laingen

No abstract provided.

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The Two Variable Substitution Problem For Free Products Of Groups, Leo P. Comerford, Charles C. Edmunds Jan 2008

The Two Variable Substitution Problem For Free Products Of Groups, Leo P. Comerford, Charles C. Edmunds

Leo Comerford

We consider equations of the form W(x,y) = U with U an element of a free product G of groups. We show that with suitable algorithmic conditions on the free factors of G, one can effectively determine whether or not the equations have solutions in G. We also show that under certain hypotheses on the free factors of G and the equation itself, the equation W(x,y) = U has only finitely many solutions, up to the action of the stabilizer of W(x,y) in Aut().

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Fixed Points Of Abelian Actions On S2, John Franks, Michael Handel, Kamlesh Parwani Oct 2007

Fixed Points Of Abelian Actions On S2, John Franks, Michael Handel, Kamlesh Parwani

Kamlesh Parwani

We prove that if $F$ is a finitely generated abelian group of orientation preserving $C^1$ diffeomorphisms of $R^2$ which leaves invariant a compact set then there is a common fixed point for all elements of $F.$ We also show that if $F$ is any abelian subgroup of orientation preserving $C^1$ diffeomorphisms of $S^2$ then there is a common fixed point for all elements of a subgroup of $F$ with index at most two.

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Fixed Points Of Abelian Actions, John Franks, Michael Handel, Kamlesh Parwani Jul 2007

Fixed Points Of Abelian Actions, John Franks, Michael Handel, Kamlesh Parwani

Kamlesh Parwani

We prove that if $\F$ is an abelian group of $C^1$ diffeomorphisms isotopic to the identity of a closed surface $S$ of genus at least two then there is a common fixed point for all elements of $\F.$

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Graphics With Pgf And Tikz, Andrew Mertz, William Slough Jan 2007

Graphics With Pgf And Tikz, Andrew Mertz, William Slough

Andrew Mertz

Beautiful and expressive documents often require beautiful and expressive graphics. PGF and its front-end TikZ walk a fine line between power, portability and usability, giving a TEX-like approach to graphics. While PGF and TikZ are extensively documented, first-time users may prefer learning about these packages using a collection of graduated examples. The examples presented here cover a wide spectrum of use and provide a starting point for exploration.

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Graphics With Tikz, Andrew Mertz, William Slough Jan 2007

Graphics With Tikz, Andrew Mertz, William Slough

Andrew Mertz

Beautiful and expressive documents often require beautiful and expressive graphics. PGF and its front-end TikZ walk a thin line between power, portability and usability, giving a TEX-like approach to graphics. While PGF and TikZ are extensively documented, first-time users may prefer learning about these packages using a collection of graduated examples. The examples presented here cover a wide spectrum of use and provide a starting point for exploration.

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Programming With Perltex, Andrew Mertz, William Slough Jan 2007

Programming With Perltex, Andrew Mertz, William Slough

Andrew Mertz

PerlTEX couples two well-known worlds—the Perl programming language and the LATEX typesetting system. The resulting system provides users with a way to augment LATEX macros with Perl code, thereby adding programming capabilities to LATEX that would otherwise be difficult to express. In this paper, we illus- trate the use of PerlTEX with a variety of examples and explain the associated Perl code. Although Perl may perhaps be best known for its string manipula- tion capabilities, we demonstrate how PerlTEX indirectly provides support for “programming” graphics through the use of additional packages such as TikZ.

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Impact Of Computers On Cultures In Third World Countries: A Case Of Computers In Education, James R. Ochwa-Echel Jan 2007

Impact Of Computers On Cultures In Third World Countries: A Case Of Computers In Education, James R. Ochwa-Echel

James R. Ochwa-Echel

No abstract provided.

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Simple Braids For Surface Homeomorphisms, Kamlesh Parwani Dec 2006

Simple Braids For Surface Homeomorphisms, Kamlesh Parwani

Kamlesh Parwani

Let S be a compact, oriented surface with negative Euler characteristic and f:S→S be a homeomorphism isotopic to the identity. If there exists a periodic orbit with a non-zero rotation vector (p→,q), then there exists a simple braid with the same rotation vector.

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Library World Wide Web Sites At Medium-Sized Universities : A Re-Examination, Bradley P. Tolppanen, Joan Miller, Martha H. Wooden, Lori M. Tolppanen Jul 2005

Library World Wide Web Sites At Medium-Sized Universities : A Re-Examination, Bradley P. Tolppanen, Joan Miller, Martha H. Wooden, Lori M. Tolppanen

Bradley P. Tolppanen

No abstract provided.

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Actions Of Sl(N,Z) On Homology Spheres, Kamlesh Parwani Apr 2005

Actions Of Sl(N,Z) On Homology Spheres, Kamlesh Parwani

Kamlesh Parwani

Any continuous action of SL(n,Z), where n > 2, on a r-dimensional mod 2 homology sphere factors through a finite group action if r < n - 1. In particular, any continuous action of SL(n+2,Z) on the n-dimensional sphere factors through a finite group action.

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Monotone Periodic Orbits For Torus Homeomorphisms, Kamlesh Parwani Jan 2005

Monotone Periodic Orbits For Torus Homeomorphisms, Kamlesh Parwani

Kamlesh Parwani

Let f be a homeomorphism of the torus isotopic to the identity and suppose that there exists a periodic orbit with a non-zero rotation vector (p/q,r/q), then f has a topologically monotone periodic orbit with the same rotation vector.

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