The effect of the spacing of background elements upon optomotor memory responses in the crab: the influence of adding or deleting features during darkness

1. Study was made of the effect of separation between stripes in the visual field upon responses which indicate memory of those stripes. 2. The amount of separation between white stripes had very little effect, whereas response strength and the amount of separation between black stripes were directly proportional. 3. The presence of extra, non-displaced black stripes prior to or following displacement reduced the size of the memory responses. 4. The effects of the amount of separation in the two cases were comparable. In both situations the separation affected only the responses to displacement of the stripe borders nearest to the extra stripe. 5. The effect of extra stripes present prior to displacement was in turn affected by the duration of the dark period, whilst the effect of those present during the post-displacement period was not. This accounts for the larger effect of extra stripes present during the psot-displacement period. 6. By expanding stripe width during darkness it was possible to distinguish between the effects of distance between stripes and the amount of white space separating them. Reducing white space while distance remains constant causes reductions in response strength, whereas reducing the distance between a memory zone and the white space between it and the neighboring stripe increased the size of the memory response

Application of second-order turbulent modeling to the prediction of radiated aerodynamic sound

The Ribner formulation of the generation of aerodynamic sound is coupled with predictions of second-order velocity correlations and integral scale to estimate the sound radiated from several complicated jet flows. In particular, it is shown that the sound radiated from a cold swirling jet is greater than from its nonswirling equal thrust counterpart. The noise radiated from the flow field of a multitube suppressor was estimated and compared with an equal thrust diameter Gaussian jet. It is shown that the multitube concept is indeed quieter

Assessing U.S. energy policy

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Yale Boola! : March and Two Step

https://digitalcommons.library.umaine.edu/mmb-ps/2370/thumbnail.jp

Calorimetric studies of the state of water in deeply frozen human monocytes

Intra- and extracellular phase transitions in human peripheral blood monocyte suspensions with and without the cryoprotectant 1 M dimethylsulfoxide were measured using differential scanning calorimetry. Using an fluorescence diacetate/ethidium bromide assay for membrane integrity and a phagocytosis assay for cell function, it was found that mortality was correlated with several phase transitions under a variety of cooling and warming regimens. As a result of these studies we concluded that: intracellular freezing is lethal, but avoidance of freezing during fast cooling is not sufficient to provide complete protection; a subtle freezing injury in the cryoprotected monocytes can be correlated with a measurable increase in devitrification on warming; and the cell contents form more stable glasses than the Hanks' balanced salt solution with fetal calf serum used as the extracellular medium

Atmospheric-wake vortex interactions

The interactions of a vortex wake with a turbulent stratified atmosphere are investigated with the computer code WAKE. It is shown that atmospheric shear, turbulence, and stratification can provide the dominant mechanisms by which vortex wakes decay. Computations included the interaction of a vortex wake with a viscous ground plane. The observed phenomenon of vortex bounce is explained in terms of secondary vorticity produced on the ground. This vorticity is swept off the ground and advected about the vortex pair, thereby altering the classic hyperbolic trajectory. The phenomenon of the solitary vortex is explained as an interaction of a vortex with crosswind shear. Here, the vortex having the sign opposite that of the sign of the vorticity in the shear is dispersed by a convective instability. This instability results in the rapid production of turbulence which in turn disperses the smoke marking the vortex

To what extent do the Classical Equations of Motion Determine the Quantization Scheme?

A simple example of one particle moving in a (1+1) space-time is considered. As an example we take the harmonic oscillator. We confirm the statement that the classical Equations of Motion do not determine at all the quantization scheme. To this aim we use two inequivalent Lagrange functions, yielding Euler-Lagrange Equations, having the same set of solutions. We present in detail the calculations of both cases to emphasize the differences occuring between them.Comment: LaTeX 20 page

AN INVESTIGATION OF PROVIDER SELF-INSIGHT INTO THEIR CHRON-IC PAIN MANAGEMENT

poster abstractResearch indicates pain management varies across patient sex, race, and mental health status; however, little is known about the ex-tent to which providers are aware of these influences on their clinical decisions. This preliminary study examines the correspondence be-tween providers’ actual and self-reported use of these variables when making pain-related treatment decisions. We also examined the rela-tionship between providers’ self-awareness and their attitudes about sex, race, and depression. Forty-four participants (24 providers, 20 trainees) made pain treatment decisions for sixteen computer-simulated patients presenting with chronic back pain. Patient sex, race, and depression status were manipulated across vignettes. At study conclusion, participants rated the extent to which nine factors influenced their treatment decisions and completed measures as-sessing their attitudes about sex, race, and depression. Approximately 68% and 91% of participants reported using patient demographic characteristics and mental health symptoms, respectively, to make pain treatment decisions. Participants demonstrated some self-awareness for the influence of patient sex, but not race or depression, on their treatment decisions. Participants’ attitudes about sex and race were not significantly associated with their self-reported or actual use of patient demographic information when making treatment decisions. Of the participants who reportedly used mental health symptoms, higher negative attitudes about depression were significantly associat-ed with greater self-reported influence of mental health symptoms on pain treatment decisions (r=-0.42, p<0.01). However, there was no significant association between depression attitudes and actual use of depression symptoms. These findings suggest that (1) providers’ have some awareness of the influence of patient sex, but not race or de-pression, on their treatment decisions, and (2) providers’ attitudes about sex, race, and depression do not sufficiently explain this general lack of awareness. These findings have important clinical implications and may inform interventions to improve pain management and re-duce pain disparities

Repeated visual distracter exposure enhances new discrimination learning and sustained attention task performance in rats

Repeated exposure to distraction requires attentional effort to restore task performance. However, the impact of repeated distracter exposure and exertion of attentional effort on new learning has not been examined. In the present experiment, rats were trained in a two-lever sustained attention task Rats then continued to train, for 12 sessions, in this task either with or without a flashing houselight distracter throughout the session. The flashing houselight transiently decreased attentional performance. Trials that were part of a new light-location discrimination task were then interspersed within the sustained attention task sessions. The frequency of these new light-location discrimination trials increased with additional training. Rats exposed to the distracter exhibited higher accuracy levels during some blocks of sessions in the new light-location discrimination task trials and in the remaining sustained attention task trials compared to rats that were not exposed to the distracter. The effects of repeated distracter exposure are interpreted in the context of an occasion-setting model that has been used to describe performance in this task. (C) 2012 Elsevier B.V. All rights reserved