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2013

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Articles 9541 - 9570 of 11462

Full-Text Articles in Physical Sciences and Mathematics

Assessment Of Detection And Characterization Of Simulated Lung Nodules With Low-Dose Ct, Kendrick J. Williams Jan 2013

Assessment Of Detection And Characterization Of Simulated Lung Nodules With Low-Dose Ct, Kendrick J. Williams

LSU Master's Theses

Purpose: The quality of a computed tomography (CT) image and the dose delivered depend upon the acquisition parameters used to acquire the CT scan. Current, voltage and pitch are acquisition parameters that affect the image quality. The purpose of this study was to determine the influence of current, voltage and pitch on physicians’ ability to characterize small, solid nodules with low-dose computed tomography. Methods: A database of lung scans with various acquisition parameters was compiled. A torso phantom and acrylic beads were used to simulate the lungs and nodules within the lungs. Several sizes of acrylic sphere were used to …

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Combined Effects Of Co2 And Light On Large And Small Isolates Of The Unicellular N2-Fixing Cyanobacterium Crocosphaera Watsonii From The Western Tropical Atlantic Ocean, Nathan S. Garcia, Fei-Xue Fu, Cynthia L. Breene, Elizabeth K. Yu, Peter W. Bernhardt, Margaret R. Mulholland, David A. Hutchins Jan 2013

Combined Effects Of Co2 And Light On Large And Small Isolates Of The Unicellular N2-Fixing Cyanobacterium Crocosphaera Watsonii From The Western Tropical Atlantic Ocean, Nathan S. Garcia, Fei-Xue Fu, Cynthia L. Breene, Elizabeth K. Yu, Peter W. Bernhardt, Margaret R. Mulholland, David A. Hutchins

OES Faculty Publications

We examined the combined effects of light and pCO2 on growth, CO2-fixation and N2-fixation rates by strains of the unicellular marine N2-fixing cyanobacterium Crocosphaera watsonii with small (WH0401) and large (WH0402) cells that were isolated from the western tropical Atlantic Ocean. In low-pCO2-acclimated cultures (190ppm) of WH0401, growth, CO2-fixation and N2-fixation rates were significantly lower than those in cultures acclimated to higher (present-day approximate to 385ppm, or future approximate to 750ppm) pCO2 treatments. Growth rates were not significantly different, however, in low-pCO2-acclimated cultures of …

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Report On Collaboration Of Dr. Diane Horn With Dr. Michael Mcshane As Part Of The Climate Change And Sea Level Rise Initiative, Diane Horn, Michael K. Mcshane Jan 2013

Report On Collaboration Of Dr. Diane Horn With Dr. Michael Mcshane As Part Of The Climate Change And Sea Level Rise Initiative, Diane Horn, Michael K. Mcshane

CCSLRI Reports

No abstract provided.

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Garbage On The Green 2007-2012 Summary Report, James Taylor, Abdub Jirmo Jan 2013

Garbage On The Green 2007-2012 Summary Report, James Taylor, Abdub Jirmo

Garbage on the Green Reports

To gain a better understanding of the University’s solid waste stream, the UNF Environmental Center, with support from Physical Facilities, decided to conduct a waste audit in 2007. The program would be called ‘Garbage on the Green’, which takes its name from ‘The Green’ a popular common space on the UNF campus. The waste audit would allow Physical Facility staff to gain a better understanding of the solid waste stream and would help guide decisions to improve the University’s overall diversion rate.

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Luminescent Laf₃:Ce-Doped Organically Modified Nanoporous Silica Xerogels, Mingzhen Yao, Ryan Hall, Wei Chen, Dhairyashil Mohite, Nicholas Leventis, N. Lu, J. Wang, M. J. Kim, H. Luo, Hongbing Lu Jan 2013

Luminescent Laf₃:Ce-Doped Organically Modified Nanoporous Silica Xerogels, Mingzhen Yao, Ryan Hall, Wei Chen, Dhairyashil Mohite, Nicholas Leventis, N. Lu, J. Wang, M. J. Kim, H. Luo, Hongbing Lu

Chemistry Faculty Research & Creative Works

Organically modified silica compounds (ORMOSILs) were synthesized by a sol-gel method from amine-functionalized 3-aminopropyl triethoxylsilane and tetramethylorthosilicate and were doped in situ with LaF3:Ce nanoparticles, which in turn were prepared either in water or in ethanol. Doped ORMOSILs display strong photoluminescence either by UV or X-ray excitation and maintain good transparency up to a loading level of 15.66% w/w. The TEM observations demonstrate that ORMOSILs remain nanoporous with pore diameters in the 5-10 nm range. LaF3:Ce nanoparticles doped into the ORMOSILs are rod-like, 5 nm in diameter and 10-15 nm in length. Compression testing indicates that …

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Theoretical Methods For Blur-Correction In Electron And Soft X-Ray Microscopy, Joanna Klukowska Jan 2013

Theoretical Methods For Blur-Correction In Electron And Soft X-Ray Microscopy, Joanna Klukowska

Dissertations, Theses, and Capstone Projects

The process of object reconstruction from projections is widely used in many fields. One of the applications is the reconstruction of biological specimens from two-dimensional projections in transmission electron microscopy and transmission x-ray microscopy. Various methods have been developed for correcting the blurring that occurs when the projections are obtained by a real instrument. As the attainable resolution increases, new issues become apparent and need to be taken into account in the imaging model. In this dissertation we concentrate on the point spread function and its impact on the quality and usefulness of the reconstructions from images obtained according to …

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The Classical Limit Of Quantum Optics: Not What It Seems At First Sight, Yakir Aharonov, Alonso Botero, Shmuel Nussinov, Sandu Popescu, Jeff Tollaksen, Lev Vaidman Jan 2013

The Classical Limit Of Quantum Optics: Not What It Seems At First Sight, Yakir Aharonov, Alonso Botero, Shmuel Nussinov, Sandu Popescu, Jeff Tollaksen, Lev Vaidman

Mathematics, Physics, and Computer Science Faculty Articles and Research

What light is and how to describe it has always been a central subject in physics. As our understanding has increased, so have our theories changed: geometrical optics, wave optics and quantum optics are increasingly sophisticated descriptions, each referring to a larger class of phenomena than its predecessor. But how exactly are these theories related? How and when wave optics reduces to geometric optics is a rather simple problem. Similarly, how quantum optics reduces to wave optics has also been considered to be a very simple business. It is not so. As we show here the classical limit of quantum …

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Did Irrigation Impact 20th Century Temperature In The High Plains Aquifer Region?, Rezaul Mahmood Jan 2013

Did Irrigation Impact 20th Century Temperature In The High Plains Aquifer Region?, Rezaul Mahmood

School of Natural Resources: Faculty Publications

No abstract provided.

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Drought And Corn In Kentucky, Rezaul Mahmood Jan 2013

Drought And Corn In Kentucky, Rezaul Mahmood

School of Natural Resources: Faculty Publications

No abstract provided.

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Advancing The Field Of Polypeptoids Through The Synthesis Of Novel Architectures And Thermoresponsive Polymers, Samuel Henry Lahasky Jan 2013

Advancing The Field Of Polypeptoids Through The Synthesis Of Novel Architectures And Thermoresponsive Polymers, Samuel Henry Lahasky

LSU Doctoral Dissertations

Peptidomimetic polymers are an emerging class of polymers that are structurally related to polypeptides. Due to their structural similarities, these polymers can be used to study some of the physical aspects of polypeptides (for example, protein folding). They are also increasingly being used in the fields of biology and drug-delivery. Some members of peptidomimetic polymers include polyacrylamides, polyoxazolines and polypeptoids. Polymer synthesis and characterization has been performed for both polyacrylamides and polyoxazolines, with research dating back to the 1950s and 1980s respectively. Research in the field of polypeptoids has not been as extensive; however, emerging synthetic strategies are allowing for …

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Evaluation Of Thermal Insulation By Coal Beds In The Western Arkoma Basin, Ok And Implications For Large Scale Geothermal Resources, Matthew Freeman Jan 2013

Evaluation Of Thermal Insulation By Coal Beds In The Western Arkoma Basin, Ok And Implications For Large Scale Geothermal Resources, Matthew Freeman

LSU Master's Theses

Weighted average geothermal gradients in the Western Arkoma Basin, Oklahoma are estimated from bottom hole temperatures (BHT) from 158 oil and gas wells. The regional geothermal gradient is 28.8 °C/km. The central and north central portions of the basin have higher gradients than southern and northern portions, especially in large areas of Pittsburg and Haskell counties where geothermal gradients in excess of 36 °C/km exist. These gradients suggest that temperatures suitable for low temperature geothermal power exist at depths of 2-3 km. Coals have very low thermal conductivity (0.15 – 0.5 W/m°K) acting as thermal insulators. This study examines the …

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On The Persistence Properties Of The Cross-Coupled Camassa-Holm System, David Henry, Darryl Holm, Rossen Ivanov Jan 2013

On The Persistence Properties Of The Cross-Coupled Camassa-Holm System, David Henry, Darryl Holm, Rossen Ivanov

Articles

In this paper we examine the evolution of solutions, that initially have compact support, of a recently-derived system of cross-coupled Camassa-Holm equations. The analytical methods which we employ provide a full picture for the persistence of compact support for the momenta. For solutions of the system itself, the answer is more convoluted, and we determine when the compactness of the support is lost, replaced instead by an exponential decay rate.

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Delphi Web Server: A Comprehensive Online Suite For Electrostatic Calculations Of Biological Macromolecules And Their Complexes., Subhra Sarkar, Shawn Witham, Jie Zhang, Maxim Zhenirovskyy, Walter Rocchia Jan 2013

Delphi Web Server: A Comprehensive Online Suite For Electrostatic Calculations Of Biological Macromolecules And Their Complexes., Subhra Sarkar, Shawn Witham, Jie Zhang, Maxim Zhenirovskyy, Walter Rocchia

Publications

Here we report a web server, the DelPhi web server, which utilizes DelPhi program to calculate electrostatic energies and the corresponding electrostatic potential and ionic distributions, and dielectric map. The server provides extra services to fix structural defects, as missing atoms in the structural file and allows for generation of missing hydrogen atoms. The hydrogen placement and the corresponding DelPhi calculations can be done with user selected force field parameters being either Charmm22, Amber98 or OPLS. Upon completion of the calculations, the user is given option to download fixed and protonated structural file, together with the parameter and Delphi output …

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Using Delphi Capabilities To Mimic Protein's Conformational Reorganization With Amino Acid Specific Dielectric Constants, Lin Wang, Zhe Zhang, Walter Rocchia, Emil Alexov Jan 2013

Using Delphi Capabilities To Mimic Protein's Conformational Reorganization With Amino Acid Specific Dielectric Constants, Lin Wang, Zhe Zhang, Walter Rocchia, Emil Alexov

Publications

Many molecular events are associated with small or large conformational changes occurring in the corresponding proteins. Modeling such changes is a challenge and requires significant amount of computing time. From point of view of electrostatics, these changes can be viewed as a reorganization of local charges and dipoles in response to the changes of the electrostatic field, if the cause is insertion or deletion of a charged amino acid. Here we report a large scale investigation of modeling the changes of the folding energy due to single mutations involving charged group. This allows the changes of the folding energy to …

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Between Algorithm And Model: Different Molecular Surface Definitions For The Poisson-Boltzmann Based Electrostatic Characterization Of Biomolecules In Solution, Sergio Decherchi, José Colmenares, Chiara Eva Catalano, Michela Spagnuolo, Emil Alexov, Walter Rocchia Jan 2013

Between Algorithm And Model: Different Molecular Surface Definitions For The Poisson-Boltzmann Based Electrostatic Characterization Of Biomolecules In Solution, Sergio Decherchi, José Colmenares, Chiara Eva Catalano, Michela Spagnuolo, Emil Alexov, Walter Rocchia

Publications

The definition of a molecular surface which is physically sound and computationally efficient is a very interesting and long standing problem in the implicit solvent continuum modeling of biomolecular systems as well as in the molecular graphics field. In this work, two molecular surfaces are evaluated with respect to their suitability for electrostatic computation as alternatives to the widely used Connolly-Richards surface: the blobby surface, an implicit Gaussian atom centered surface, and the skin surface. As figures of merit, we considered surface differentiability and surface area continuity with respect to atom positions, and the agreement with explicit solvent simulations. Geometric …

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Bright Radio Emission From An Ultraluminous Stellar-Mass Microquasar In M31, Matthew J. Middleton, James C. A. Miller-Jones, Sera Markoff, Rob Fender, Martin Henze, Natasha Hurley-Walker, Anna M. M. Scaife, Timorthy P. Roberts, Dominic Walton, John Carpenter, Jean-Pierre Macquart, Geoffrey C. Bower, Mark Gurwell, Wolfgang Pietsch, Frank Haberl, Jonathan Harris, Michael Daniel, Junayd Miah, Chris Done, John Morgan, Hugh Dickinson, Phil Charles, Vadim Burwitz, Massimo Della Valle, Michael Freyberg, Jochen Greiner, Margarita Hernanz, Dieter H. Hartmann, Despina Hatzidimitriou, Arno Riffeser, Gloria Sala, Stella Seitz, Pablo Reig, Arne Rau, Marina Orio, David Titterington, Keith Grainge Jan 2013

Bright Radio Emission From An Ultraluminous Stellar-Mass Microquasar In M31, Matthew J. Middleton, James C. A. Miller-Jones, Sera Markoff, Rob Fender, Martin Henze, Natasha Hurley-Walker, Anna M. M. Scaife, Timorthy P. Roberts, Dominic Walton, John Carpenter, Jean-Pierre Macquart, Geoffrey C. Bower, Mark Gurwell, Wolfgang Pietsch, Frank Haberl, Jonathan Harris, Michael Daniel, Junayd Miah, Chris Done, John Morgan, Hugh Dickinson, Phil Charles, Vadim Burwitz, Massimo Della Valle, Michael Freyberg, Jochen Greiner, Margarita Hernanz, Dieter H. Hartmann, Despina Hatzidimitriou, Arno Riffeser, Gloria Sala, Stella Seitz, Pablo Reig, Arne Rau, Marina Orio, David Titterington, Keith Grainge

Publications

A subset of ultraluminous X-ray sources (those with luminosities < 10^40 erg s^-1)^1 are thought to be powered by the accretion of gas onto black holes with masses of ~5-20 M⊙, probably via an accretion disc. The X-ray and radio emission are coupled in such Galactic sources, with the radio emission originating in a relativistic jet thought to be launched from the innermost regions near the black hole4,5, with the most powerful emission occurring when the rate of infalling matter approaches a theoretical maximum (the Eddington limit). Only four such maximal sources are known in the Milky Way, and the absorption of soft X-rays in the interstellar medium precludes determining the causal sequence of events that leads to the ejection of the jet. Here we report radio and X-ray observations of a bright new X-ray source whose peak luminosity can exceed 1039 erg s^-1 in the nearby galaxy, M31. The radio luminosity is extremely high and shows variability on a timescale of tens of minutes, arguing that the source is highly compact and powered by accretion close to the Eddington limit onto a stellar mass black hole. Continued radio and X-ray monitoring of such sources should reveal the causal relationship between the accretion flow and the powerful jet emission.

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Supersoft X-Rays Reveal A Classical Nova In The M31 Globular Cluster Bol 126, M. Henze, W. Pietsch, F. Haberl, M. Della Valle, A. Riffeser, G. Sala, D. Hatzidimitriou, F. Hofmann, Dieter H. Hartmann, J. Koppenhoefer Jan 2013

Supersoft X-Rays Reveal A Classical Nova In The M31 Globular Cluster Bol 126, M. Henze, W. Pietsch, F. Haberl, M. Della Valle, A. Riffeser, G. Sala, D. Hatzidimitriou, F. Hofmann, Dieter H. Hartmann, J. Koppenhoefer

Publications

Context. Classical novae (CNe) represent the main class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Only three confirmed novae and three SSSs have been discovered in globular clusters (GCs) of any galaxy so far, of which one nova and two SSSs (including the nova) were found in M 31 GCs. Aims. To study the SSS state of CNe we carried out a high-cadence X-ray monitoring of the M 31 central area with XMM-Newton and Chandra. This project is supplemented by regular optical monitoring programmes at various observatories. Methods. We analysed X-ray and …

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The Extraterritoriality Of Data Privacy Laws -- An Explosive Issue Yet To Detonate, Fred H. Cate, Christopher Kuner, Christopher Millard, Dan Jerker B. Svantesson Jan 2013

The Extraterritoriality Of Data Privacy Laws -- An Explosive Issue Yet To Detonate, Fred H. Cate, Christopher Kuner, Christopher Millard, Dan Jerker B. Svantesson

Articles by Maurer Faculty

No abstract provided.

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Intercalation And Delamination Of Layered Carbides And Carbonitrides, Olha Mashtalir, Michael Naguib, Vadym Mochalin, Yohan Dall'agnese, Min Heon, Michel W. Barsoum, Yury G. Gogotsi Jan 2013

Intercalation And Delamination Of Layered Carbides And Carbonitrides, Olha Mashtalir, Michael Naguib, Vadym Mochalin, Yohan Dall'agnese, Min Heon, Michel W. Barsoum, Yury G. Gogotsi

Chemistry Faculty Research & Creative Works

Intercalation and delamination of two-dimensional solids in many cases is a requisite step for exploiting their unique properties. Herein we report on the intercalation of two-dimensional Ti3C2, Ti3 CN and TiNbC - so called MXenes. Intercalation of hydrazine, and its co-intercalation with N,N-dimethylformamide, resulted in increases of the c-lattice parameters of surface functionalized f-Ti3C2, from 19.5 to 25.48 and 26.8 Å, respectively. Urea is also intercalated into f-Ti3C2. Molecular dynamics simulations suggest that a hydrazine monolayer intercalates between f-Ti3C2 layers. Hydrazine is also intercalated …

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Face-To-Data -- Another Developing Privacy Threat?, Fred H. Cate, Christopher Kuner, Christopher Millard, Dan Jerker B. Svantesson Jan 2013

Face-To-Data -- Another Developing Privacy Threat?, Fred H. Cate, Christopher Kuner, Christopher Millard, Dan Jerker B. Svantesson

Articles by Maurer Faculty

No abstract provided.

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Illuminating The Darkest Gamma-Ray Bursts With Radio Observations, B.A. Zauderer, E. Berger, R. Margutti, A.J. Levan, F. Olivares E., D.A. Perley, W. Fong, A. Horesh, Adria Updike, J. Greiner, N.R. Tanvir, T. Laskar, R. Chornock, A.M. Soderberg, K.M. Menten, E. Nakar, J. Carpenter, P. Chandra, A.J. Castro-Tirado, M. Bremer, J. Gorosabel, S. Guziy, D. P´Erez-Ram´Irez, J.M. Winters Jan 2013

Illuminating The Darkest Gamma-Ray Bursts With Radio Observations, B.A. Zauderer, E. Berger, R. Margutti, A.J. Levan, F. Olivares E., D.A. Perley, W. Fong, A. Horesh, Adria Updike, J. Greiner, N.R. Tanvir, T. Laskar, R. Chornock, A.M. Soderberg, K.M. Menten, E. Nakar, J. Carpenter, P. Chandra, A.J. Castro-Tirado, M. Bremer, J. Gorosabel, S. Guziy, D. P´Erez-Ram´Irez, J.M. Winters

Arts & Sciences Faculty Publications

No abstract provided.

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Physical Unclonable Function Techniques Applied For Digital Hardware Protection, Anthony Barrera Jan 2013

Physical Unclonable Function Techniques Applied For Digital Hardware Protection, Anthony Barrera

Dissertations and Theses

"Privacy is an important property that is growing harder to keep as people develop new ways to steal information from users on their computers. Software alone cannot ensure privacy since an infected system is untrustworthy. This paper presents several challenges malware brings that can be solved by using an external processor. Techniques such as keystroke encryption and message authentication can be used to protect users from having their passwords and other private data stolen. To take advantage of the external hardware, a physical unclonable function can be used to generate private keys without the need for storing them in memory. …

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3d Hallway Modeling Using A Single Image, Gregory M. Olmschenk Jan 2013

3d Hallway Modeling Using A Single Image, Gregory M. Olmschenk

Dissertations and Theses

"Real-time, low-resource corridor reconstruction using a single consumer grade RGB camera is a powerful tool for allowing a fast, inexpensive solution to indoor mobility of a visually impaired person or a robot. The perspective and known geometry of a corridor is used to extract the important features of the image and create a 3D model from a single image. Multiple 3D models can be combined to increase confidence and provide a global 3D model. This paper presents our results on 3D corridor modeling using single images. First a simple but effective 3D corridor modeling approach is introduced which makes very …

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Supercharging: An Investigation Into The Effects Of External Amino Acid Residue Charge On The Solubility And Internal Electric Character Of Bound Ligands In A Heme-Binding De Novo-Designed Protein, Cooper French Jan 2013

Supercharging: An Investigation Into The Effects Of External Amino Acid Residue Charge On The Solubility And Internal Electric Character Of Bound Ligands In A Heme-Binding De Novo-Designed Protein, Cooper French

Dissertations and Theses

De novo protein design offers many interesting prospects both as a means to better understand natural protein dynamics and as a potential resource in biomedical and industrial applications. In this work I describe the modification of a simple, well-characterized heme-binding protein by altering side chain residue identities on the hydrophilic surface of the protein to produce variants with a range of net external charges. These charge modifications had a significant impact on nearly every measurable character of the protein. This work establishes the hard limits of supercharging within our experimental protein scaffold system, demonstrating that excessive positive charge increased the …

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High Harmonic Spectroscopy Of The Cooper Minimum In Molecules, M. C. H. Wong, Anh-Thu Le, A. F. Alharbi, A. E. Boguslavskiy, R. R. Lucchese, J.-P. Brichta, C. D. Lin, V. R. Bhardwaj Jan 2013

High Harmonic Spectroscopy Of The Cooper Minimum In Molecules, M. C. H. Wong, Anh-Thu Le, A. F. Alharbi, A. E. Boguslavskiy, R. R. Lucchese, J.-P. Brichta, C. D. Lin, V. R. Bhardwaj

Physics Faculty Research & Creative Works

The Cooper minimum (CM) has been studied using high harmonic generation solely in atoms. Here, we present detailed experimental and theoretical studies on the CM in molecules probed by high harmonic generation using a range of near-infrared light pulses from λ = 1.3 to 1.8 µm. We demonstrate the CM to occur in CS₂ and CCl₄ at ~42 and ~40 eV, respectively, by comparing the high harmonic spectra with the known partial photoionization cross sections of different molecular orbitals, confirmed by theoretical calculations of harmonic spectra. We use CM to probe electron localization in Cl-containing molecules (CCl₄, CH₂Cl₂, and trans …

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Mutation From Arginine To Lysine At The Position 189 Of Hemagglutinin Contributes To The Antigenic Drift In H3n2 Swine Influenza Viruses, Jianqiang Ye, Yifei Xu, Jillian Harris, Hailiang Sun, Andrew S. Bowman, Fred L. Cunningham, Carol Cardona, Kyoungjin J. Yoon, Richard D. Slemons, Xiu-Feng Wan Jan 2013

Mutation From Arginine To Lysine At The Position 189 Of Hemagglutinin Contributes To The Antigenic Drift In H3n2 Swine Influenza Viruses, Jianqiang Ye, Yifei Xu, Jillian Harris, Hailiang Sun, Andrew S. Bowman, Fred L. Cunningham, Carol Cardona, Kyoungjin J. Yoon, Richard D. Slemons, Xiu-Feng Wan

United States Department of Agriculture Wildlife Services: Staff Publications

Two distinct antigenic clusters were previously identified among the H3N2 swine influenza A viruses (IAVs) and were designated H3N2SIV-alpha and H3N2SIV-beta (Feng et al., 2013. Journal of Virology 87(13), 7655–7667). A consistent mutation was observed at the position 189 of hemagglutinin (R189K) between H3N2SIV-alpha and H3N2SIV-beta fair isolates. To evaluate the contribution of R189K mutation to the antigenic drift from H3N2SIV-alpha to H3N2SIV-beta, four reassortant viruses with189R or189K were generated. The antigenic cartography demonstrated that the R189K mutation in the hemagglutinin of H3N2IAV contributed to the antigenicdrift, separating these viruses into H3N2SIV-alpha to H3N2SIV- beta. This R189K mutation was also …

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Patron-Driven Acquisition And Circulation At An Academic Library: Interaction Effects And Circulation Performance Of Print Books Acquired Via Librarians’ Orders, Approval Plans, And Patrons’ Interlibrary Loan Requests, David C. Tyler, Christina D. Falci, Joyce C. Melvin, Marylou Epp, Anita M. Kreps Jan 2013

Patron-Driven Acquisition And Circulation At An Academic Library: Interaction Effects And Circulation Performance Of Print Books Acquired Via Librarians’ Orders, Approval Plans, And Patrons’ Interlibrary Loan Requests, David C. Tyler, Christina D. Falci, Joyce C. Melvin, Marylou Epp, Anita M. Kreps

UNL Libraries: Faculty Publications

Numerous publications on patron-driven acquisition (PDA) for print books and similar materials have reported that patron-requested materials circulate more. Tying circulation to selector may be failing to address the complex of factors that contributes to items’ circulation. In the present study, the authors revisit a PDA program’s data and to determine whether PDA print books’ circulation advantage persists when the potential interactions of several additional variables are taken into account. As with prior studies, library patrons were significantly better predictors of circulation than were librarians or approval plans. However, librarians proved to be significantly better predictors than were approval plans.

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Summer Phytoplankton Diversity In Small Lakes Of Northwest Washington, Rachael D. (Rachael Dawn) Gravon Jan 2013

Summer Phytoplankton Diversity In Small Lakes Of Northwest Washington, Rachael D. (Rachael Dawn) Gravon

WWU Graduate School Collection

I sampled forty lakes in the Puget Sound region of northwest Washington to investigate the relationship between water quality, site characteristics, and algal composition. Water samples were collected during the summer of 2008 to measure nutrients, alkalinity, chlorophyll-a, dissolved oxygen, specific conductance, and temperature. Watershed characteristics were recorded to assess shoreline composition and dominant land use. Phytoplankton samples were collected, preserved, and concentrated in settling chambers to determine taxonomic composition and algal biovolume. Unpreserved phytoplankton samples were also collected and used to generate a species list for each lake. The data were examined using correlation analysis and hierarchical clustering to …

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An Analysis Of The Educational Value And Impact Of A Dual, Versus Single, Robotic Surgical Console In The Training Of Obgyn Residents, Joseph E. Patruno Md, Hubert K. Huang Ms, Med, Michelle W. Huang Md, Thomas Hutchinson Md, Martin A. Martino Md Jan 2013

An Analysis Of The Educational Value And Impact Of A Dual, Versus Single, Robotic Surgical Console In The Training Of Obgyn Residents, Joseph E. Patruno Md, Hubert K. Huang Ms, Med, Michelle W. Huang Md, Thomas Hutchinson Md, Martin A. Martino Md

Department of Obstetrics & Gynecology

No abstract provided.

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The Challenge Of Early Inpatient Postpartum Depression Screening, Elizabeth A. Berger Do, John C. Smulian Md, Mph, Joanne Quiñones Md, Msce, Rory L. Marraccini Md, Amy Wu Bs, Elizabeth A. Smulian Bs, Sandra L. Curet Md Jan 2013

The Challenge Of Early Inpatient Postpartum Depression Screening, Elizabeth A. Berger Do, John C. Smulian Md, Mph, Joanne Quiñones Md, Msce, Rory L. Marraccini Md, Amy Wu Bs, Elizabeth A. Smulian Bs, Sandra L. Curet Md

Department of Obstetrics & Gynecology

No abstract provided.

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