Sarasota, FL, United States
Sarasota, FL, United States

New College of Florida is a public liberal arts college located in Sarasota, Florida, United States. It was founded originally as a private institution and is now an autonomous honors college of the State University System of Florida. Wikipedia.


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Sendova M.,New College of Florida | Jimenez J.A.,University of North Florida
Journal of Physical Chemistry C | Year: 2012

This work demonstrates that an enhanced plasmonic response can be attained and tuned for Ag nanocomposite glasses via a real-time in situ control of the plasmonic coupling between closely spaced Ag nanoparticles (NPs). The result is achieved by a two-step modification of Ag NP-doped glasses. First, confined "super-nucleation" domains are induced by highfluence nanosecond laser irradiation promoting photofragmentation of Ag NPs in the matrix. Photoluminescence and Raman scattering spectroscopies are put to use in assessing the effects of laser treatment. Subsequently, a particle regrowth process leading to the development of strongly interacting NPs is activated during an in situ isothermal processing, which also allows for the tuning of the optical response of the material in real time. An important finding is that the post-laser thermal treatment results in a significant narrowing of the Ag NP size distribution as revealed by transmission electron microscopy. Further, valuable insights on the laser-induced "super-nucleation" and NP regrowth process leading to plasmonic coupling are obtained through a quantitative assessment employing the theoretical model for NP aggregates from Quinten and Kreibig, together with the Kolmogorov-Johnson-Mehl-Avrami (KJMA) theory of phase transformations. The activation energy of the post-laser NP regrowth process was estimated at 0.8(±0.1) eV, based on the solid-state precipitation kinetics. The current report is expected to open new avenues of research on plasmon-enhanced processes inside dielectrics with relevance to both fundamental and applied nanoscience. © 2012 American Chemical Society.


Harley H.E.,New College of Florida
Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology | Year: 2013

For millennia, dolphins have intrigued humans. Scientific study has confirmed that bottlenose dolphins are large-brained, highly social mammals with an extended developmental period, flexible cognitive capacities, and powerful acoustic abilities including a sophisticated echolocation system. These findings have led some to ask if dolphins experience aspects of consciousness. Recent investigations targeting self-recognition/self-awareness and metacognition, constructs tied to consciousness on some accounts, have analyzed the dolphin's ability to recognize itself in a mirror or on a video as well as to monitor its own knowledge in a perceptual categorization task. The current article reviews this work with dolphins and grapples with some of the challenges in designing, conducting, and interpreting these studies as well as with general issues related to studying consciousness in animals. The existing evidence does not provide a convincing case for consciousness in dolphins. For productive scientific work on consciousness in dolphins (and other animals including humans), we need clearer characterizations of consciousness, better methods for studying it, and appropriate paradigms for interpreting outcomes. A current focus on metamemory in animals offers promise for future discovery in this area. © 2013 Springer-Verlag Berlin Heidelberg.


Yildirim N.,New College of Florida
Molecular BioSystems | Year: 2012

A mathematical model was developed for the low and high affinity arabinose transport systems in E. coli. The model is a system of three ordinary differential equations and takes the dynamics of mRNAs for the araE and araFGH proteins and the internal arabinose into account. Special attention was paid to estimate the model parameters from the literature. Our analysis and simulations suggest that the high affinity transport system helps the low affinity transport system to respond to high concentration of extracellular arabinose faster, whereas the high affinity transport system responds to a small amount of extracellular arabinose. Steady state analysis of the model also predicts that there is a regime for the extracellular concentration of arabinose where the arabinose system can show bistable behavior. © 2012 The Royal Society of Chemistry.


Colladay D.,New College of Florida | McDonald P.,New College of Florida
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

Several Lagrangians associated with classical limits of Lorentz-violating fermions in the standard model extension (SME) have been shown to yield Finsler functions when the theory is expressed in Euclidean space. When spin couplings are present, the Lagrangian can develop singularities that obstruct the construction of a globally defined Legendre transformation, leading to singular Finsler spaces. A specific sector of the SME where such problems arise is studied. It is found that the singular behavior can be eliminated by an appropriate lifting of the problem to an associated algebraic variety. This provides a smooth classical model for the singular problem. In Euclidean space, the procedure involves combining two related singular Finsler functions into a single smooth function with a semi-positive-definite quadratic form defined on a desingularized variety. © 2015 American Physical Society.


Colladay D.,New College of Florida | McDonald P.,New College of Florida
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

Certain momentum-dependent terms in the fermion sector of the Lorentz-violating standard model extension (SME) yield solvable classical Lagrangians of a type not mentioned in the literature. These cases yield new relatively simple examples of Finsler and pseudo-Finsler structures. One of the cases involves antisymmetric d-type terms and yields a new example of a relatively simple covariant Lagrangian. © 2012 American Physical Society.


Ruppeiner G.,New College of Florida
Journal of Physics: Conference Series | Year: 2013

Thermodynamics unavoidably contains fluctuation theory, expressible in terms of a unique thermodynamic information metric. This metric produces an invariant thermodynamic Riemannian curvature scalar R which, in fluid and spin systems, measures interatomic interactions. Specifically, |R| measures the size of organized fluctuating microscopic structures, and the sign of R indicates whether the interactions are effectively attractive or repulsive. R has also been calculated for black hole thermodynamics for which there is no consensus about any underlying microscopic structures. It is hoped that the physical interpretation of R in fluid and spin systems might offer insight into black hole microstructures. I give a brief review of results for R in black holes, including stability, the sign of R, R 0, diverging |R|, and various claims of "inconsistencies" in thermodynamic metric geometry. © Published under licence by IOP Publishing Ltd.


Ruppeiner G.,New College of Florida
American Journal of Physics | Year: 2010

Thermodynamic fluctuation theory originated with Einstein, who inverted the relation S=kB ln Ω to express the number of states in terms of entropy: Ω=exp(S/kB). The theory's Gaussian approximation is discussed in most statistical mechanics texts. I review work showing how to go beyond the Gaussian approximation by adding covariance, conservation, and consistency. This generalization leads to a fundamentally new object: The thermodynamic Riemannian curvature scalar R, a thermodynamic invariant. I argue that {pipe}R{pipe} is related to the correlation length and suggest that the sign of R corresponds to whether the interparticle interactions are effectively attractive or repulsive. © 2010 American Association of Physics Teachers.


Ruppeiner G.,New College of Florida
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2012

I evaluate the thermodynamic curvature R for fourteen pure fluids along their liquid-vapor coexistence curves, from the critical point to the triple point, using thermodynamic input from the NIST Chemistry WebBook. In this broad overview, R is evaluated in both the coexisting liquid and vapor phases. R is an invariant whose magnitude |R| is a measure of the size of mesoscopic organized structures in a fluid, and whose sign specifies whether intermolecular interactions are effectively attractive (R<0) or repulsive (R>0). I discuss five principles for R in pure fluids: (1) Near the critical point, the attractive part of the interactions forms loose structures of size |R| proportional to the correlation volume ξ3, and the sign of R is negative. (2) In the vapor phase, there are instances of compact clusters of size |R| formed by the attractive part of the interactions and prevented from collapse by the repulsive part of the interactions, and the sign of R is positive. (3) In the asymptotic critical point regime, the R's in the coexisting liquid and vapor phases are equal to each other, i.e., commensurate. (4) Outside the asymptotic critical-point regime incommensurate R's may be associated with metastability. (5) The compact liquid phase has |R| on the order of the volume of a molecule, with the sign of R being negative for a liquidlike state held together by attractive interactions and the sign of R being positive for a solidlike state held up by repulsive interactions. These considerations amplify and extend the application of thermodynamic curvature in pure fluids. © 2012 American Physical Society.


Grant
Agency: NSF | Branch: Standard Grant | Program: | Phase: PLANETARY ASTRONOMY | Award Amount: 244.15K | Year: 2014

This Research at Undergraduate Institutions (RUI) award from the Chemical Measurement and Imaging (CMI) Program in the Division of Chemistry, with co-funding from the Computer and Data-Enabled Science and Engineering (CDS&E) and Planetary Astronomy Programs, supports Professor Steven T. Shipman and his students at New College of Florida as they develop new tools that will help scientists analyze data from the atmospheres of planets, including our own and large clouds of molecules in space. The new tools are based on high-speed electronics that allow scientists to collect significantly more information about their samples than was previously possible. Software is being developed that takes advantage of these high-speed data-collectors and uses new computing techniques to process the influx of data. All the work is being performed by undergraduate students working with the principal investigator. The new software will be publicly shared.

The investigators are using new high-speed digitizers along with grid computing techniques to rapidly acquire and analyze rotational spectra of molecules of relevance to interstellar and atmospheric chemistry at temperatures ranging from roughly 250 to 325 K. In this temperature range, rotational spectra are extremely complex due to contributions from large amplitude motion and thermally-populated excited vibrational and conformational states. A new digitizer with a nearly 8000x speed advantage over current instrumentation is being used in conjunction with temperature-dependent and microwave-microwave double resonance measurements to automatically determine lower state energies and energy level connectivities of a large number of peaks in observed spectra. Software that is being developed, based on genetic algorithms and other approaches, will use this information to greatly ease the spectral assignment process. These algorithms will be ported to a grid computing platform to take maximum advantage of their parallelism and to further reduce the spectral analysis time.


Grant
Agency: NSF | Branch: Standard Grant | Program: | Phase: Chemical Measurement & Imaging | Award Amount: 93.00K | Year: 2011

Professor Steven T. Shipman of New College of Florida is supported by the Chemical Measurement and Imaging (CMI) Program in the Division of Chemistry (with co-funding from the Division of Astronomical Sciences) to study the spectroscopy of interstellar weeds - molecules (such as methyl formate or dimethyl ether) that are relatively abundant in the interstellar medium (ISM). The dense and unpredictable spectra of these weeds generally frustrate attempts to identify new molecules in the ISM. The objective of this research is to obtain high-quality rotational spectra of these compounds at room temperature. These results will lead to better predictions of weed transition frequencies, significantly aiding astrochemists in the search for new complex molecules in the ISM.

Undergraduate students involved in this project will be directly participating in research addressing fundamental questions about the origins of complex molecules in the universe. As part of this work, they will gain experience in molecular spectroscopy, computational chemistry, and the construction of scientific instrumentation in a tight-knit academic environment that fosters close interactions between students and faculty mentors. Students will acquire experience crafting scientific arguments and communicating the results of their research to the broader scientific community. Educational impact will be enhanced by making the equipment available via cyber-access.

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