Semiclassical and quantum polarons in crystaline acetanilide

Crystalline acetanilide is a an organic solid with peptide bond structure similar to that of proteins. Two states appear in the amide I spectral region having drastically different properties: one is strongly temperature dependent and disappears at high temperatures while the other is stable at all temperatures. Experimental and theoretical work over the past twenty five years has assigned the former to a selftrapped state while the latter to an extended free exciton state. In this article we review the experimental and theoretical developments on acetanilide paying particular attention to issues that are still pending. Although the interpretation of the states is experimentally sound, we find that specific theoretical comprehension is still lacking. Among the issues that that appear not well understood is the effective dimensionality of the selftrapped polaron and free exciton states.Comment: 28 pages 13 figure

Development of a Rubric to Measure Radiography Programmatic Assessment Plan Quality

This dissertation attempts to fill an existing gap in the literature concerning radiography programmatic assessment and provide a method of self-assessment for programs to create and evaluate their programmatic assessment plan. There is limited radiography-specific literature concerning programmatic assessment plans, and what does exist concerns general assessment best practices and some other allied health or health science related empirical research. Assessment plans are a necessary part of accreditation by the Joint Review Committee on Education in Radiologic Technology (JRCERT), which is required by many programs. However, education for many radiography program assessment plan contributors is limited in this area, and JRCERT citations concerning assessment plan standards are numerous. In order to mitigate this problem, this dissertation study created a rubric to evaluate the quality of radiography programmatic assessment plans. The methodology for this study was the Delphi technique to both develop and validate the rubric. The Delphi panel was made up of radiography programmatic assessment plan experts and consisted of multiple rounds to gain consensus for each of the rubric’s criteria and indicators. A finalized rubric is presented in Appendix D

Relationship Between Level Of Burden In Family Caregivers And Life Satisfaction In Homebound Elders

As the number of homebound elders in America increases, stresses on family caregivers for the group may develop. The purpose of this study was to examine the relationship between level of burden in family caregivers and life satisfaction in homebound elders. Roy\u27s Adaptation Model was used to guide this descriptive correlational investigation. The sample consisted of 53 family caregiver/homebound elder dyads and was drawn from among clients of a home health agency in rural northwest Alabama. Participants were interviewed in their homes during routine nursing visits. The Burden Scale was used to assess the level of burden in family caregivers living in residence with homebound elders. The Life Satisfaction Index-Z Scale was used to ascertain the level of life satisfaction in homebound elders. Pearson correlation procedures revealed an inverse relationship between level of burden in family caregivers and life satisfaction in homebound elders at the .05 level of significance. A dependent t test indicated that subjective burden was significantly greater than objective burden. Findings from this study implied that assessing the dynamics of the interpersonal relationship between family caregivers and homebound elders is an important consideration for nurses in primary care. Recommendations for future research included the conduction of studies specific to the development of nursing interventions to relieve caregiver burden and enhance life satisfaction in homebound elders

AREA OF EXPERTISE TEAMS: THE MICHIGAN APPROACH TO APPLIED RESEARCH AND EXTENSION

Michigan State University's Extension and Agricultural Experiment Station have restructured their educational delivery system through implementation of area of expertise teams. Adopting the concept of self-directed work teams from industry has resulted in enhanced credibility with stakeholders, a seamless linkage between research and Extension, and increased appropriations from the state legislature.Teaching/Communication/Extension/Profession,

Barrier crossing to the small Holstein polaron regime

We investigate the dimensionality effects of the Holstein polaron from the fully quantum regime, where the crossover between large and small polaron solutions is known to be continuous in all dimensions, into the limit described by the semiclassical Discrete Nonlinear Schr\"odinger (DNLS) Equation, where the crossover is continuous in 1D but discontinuous in higher dimensions. We use exact numerics on one hand and a two variable parametrization of the Toyozawa ansatz on the other in order to probe the crossover region in all parameter regimes. We find that a barrier appears also in 1D separating the two types of solutions, seemingly in contradiction to the common paradigm for the DNLS according to which the crossover is barrier-free. We quantify the polaron behavior in the crossover region as a function of the exciton overlap and find that the barrier remains small in 1D and tunnelling through it is not rate-limiting.Comment: 4 pages with 4 figure

Distinct Neural Circuits Underlie Prospective and Concurrent Memory-Guided Behavior

The past is the best predictor of the future. This simple postulate belies the complex neurobiological mechanisms that facilitate an individual’s use of memory to guide decisions. Previous research has shown integration of memories bias decision-making. Alternatively, memories can prospectively guide our choices. Here, we elucidate the mechanisms and timing of hippocampal (HPC), medial prefrontal cortex (mPFC), and striatal contributions during prospective memory-guided decision-making. We develop an associative learning task in which the correct choice is conditional on the preceding stimulus. Two distinct networks emerge: (1) a prospective circuit consisting of the HPC, putamen, mPFC, and other cortical regions, which exhibit increased activation preceding successful conditional decisions and (2) a concurrent circuit comprising the caudate, dorsolateral prefrontal cortex (dlPFC), and additional cortical structures that engage during the execution of correct conditional choices. Our findings demonstrate distinct neurobiological circuits through which memory prospectively biases decisions and influences choice execution

Boundary Condition in the Oscillating Turbulent Boundary Layer for the Simulation of Wave Breaking

In this paper a new numerical model for the simulation of the wave breaking is proposed. In order to represent the complex geometry of coastal regions, the three-dimensional equations of motion are expressed in integral contravariant form and are solved on a curvilinear boundary conforming grid. A time-dependent transformation of the vertical coordinate that is a function of the oscillation of the turbulent wave boundary layer is proposed. New boundary condition bottom for the equations of motion expressed in contravariant form are proposed. In order to correctly simulate the height of the breaking waves, the importance of the correct positioning, inside the oscillating turbulent boundary layer, of the centre of the calculation grid cell closest to the bottom, is demonstrated

Dissolved nitrogen in the sea water of the Northeast Pacific with notes on the total carbon dioxide and the dissolved oxygen

This paper deals with a study and discussion of the distribution of dissolved nitrogen in sea water and its relation to the dissolved oxygen and the total carbon dioxide. Previous studies have been made by Buch (1), Knudsen (8, 9), Petterson (11), Jacobsen (7), Hamburg (6), Dittmar (3) and recently by Rakestraw and Emmel (13., 14). Fox (4) published data showing the variation in the concentration of dissolved nitrogen in equilibrium with the nitrogen of the atmosphere at standard pressure for different temperatures and for different concentrations of sea water. Using these data it is possible to calculate the percent of saturation of the dissolved nitrogen in sea water at a given temperature and chlorinity, the pressure of the gaseous nitrogen being equivalent to that of the gas in air at standard pressur

Time-resolved spectroscopy of the primary photosynthetic processes of membrane-bound reaction centers from an antenna-deficient mutant of Rhodobacter capsulatus

The primary photosynthetic reactions in whole membranes of the antenna-deficient mutant strain U43 (pTXA6–10) of Rhodobacter capsulatus are studied by transient absorption and emission spectroscopy with subpicosecond time resolution. Extensive similarities between the transient absorption data on whole membranes and on isolated reaction centers support the idea that the primary processes in isolated reaction centers are not modified by the isolation procedure