Communication Apprehension Among Community College Students: A Phenomenology

A qualitative investigation was conducted to explore the phenomenon of communication apprehension among a purposeful sample of five community college students with high levels of communication apprehension. The phenomenon of Communication Apprehension (CA) is “an individual’s level of fear or anxiety associated with either real or anticipated communication with another person or persons” (Beatty, McCroskey, & Heisel, 1998, p. 197; McCroskey, 1970, p. 269). All individuals experience some level of CA, and between 30% and 40% of individuals are estimated to experience high levels of CA. For the community college student with high levels of CA, the introductory communication course can be difficult, causing significant emotional and physical distress. For the high CA student, the experienced anxiety has academic, social, and emotional implications. A phenomenological qualitative methodology was selected to give voice to the high CA student and to understand the lived experience of high CA during the introductory communication course. This study provides a rich, thick description of the lived experience of the high CA community college student. A purposeful sample of five high CA community college students enrolled in the introductory communication course was selected. Participants were identified as high CA using the Personal Report of Public Speaking Apprehension (PRPSA) (McCroskey, 2017). Study participants were selected as follows: those with high levels of CA as determined by the PRPSA instrument, and who were willing to offer insight into the lived experience of high CA. Data were gathered in two 50-minute interviews with each participant and from participatory action research (PAR) personal diaries created by study participants. Data were also gathered from field observations by the primary investigator. The lived experience of high CA is comprised of seven themes: (1) ongoing and pervasive difficulty, (2) ongoing curricular and co-curricular difficulty, (3) no division exists between real and imagined CA, (4) high CA students frequently avoid anxiety-inducing scenarios, and (5) high CA students have not been effectively equipped with mitigating techniques and in turn, use self-developed mitigation. The study is significant because it contributes to the body of knowledge related to CA for the high CA community college student

A Journey Toward Sustainable Behavior: A Project To Stimulate Reduced Electricity Consumption

Housing organizations continuously face competition from other providers of low to moderate-income residential housing. That competition motivates those agencies to perpetually search for cost savings methods, which will enable them to continue providing supportive services to their residents. Additionally, the government has entrusted certain agencies with substantial funding that can inspire the organization to search for ways to demonstrate they are competent shepherds of those resources. Given that Alpha Homes’ residents do not pay their electric bills, the fundamental question guiding this research was: could a housing organization significantly reduce the average tenant electricity usage through a combination of resident-focused Education, Economic Incentives, and Evaluation ? This quasi-experiment utilized a time series model, with multiple regression, that sought to determine if any or all of the treatments created a significant reduction in tenant electricity consumption. The results show an overall significant reduction, in monthly electricity consumption, of approximately 8 percent for the Education and Economic Incentive treatment groups, and 5.7% for the group that received both treatments, which provides support for continued program implementation. These data offer policymakers an option for the providing of services for their residents

Notable Environmental Features in Some Historical Aerial Photographs from Ashley County, Arkansas

A collection of 1939 aerial photographs from Ashley County, Arkansas was analyzed for its environmental information. Taken by the US Department of Defense (USDOD), these images show a number of features now either obscured or completely eliminated over the passage of time. One notable feature is the widespread coverage of sand blows in the eastern quarter of the county, suggesting a major soil liquefaction field consistent with strong seismic activity (magnitude 6.0 on the Richter Scale). Also seen in these photographs are the vestiges of the large prairies once found on the Pleistocene terraces of southern and eastern Arkansas. The former extent of these prairies can be clearly discerned, as can the encroachment of surrounding forests. Numerous prairie mounds are also visible across much of the county, especially in areas cleared for agriculture. Finally, nearly 15,000 contiguous hectares of virgin bottomland hardwoods along the Saline and Ouachita rivers are still apparent, which may have sheltered Ivory-Billed Woodpeckers in the 1930s. This work illustrates the value of old aerial photographs in the description of historical features by providing a snapshot of conditions that can help us understand present and future landscapes

Elasticity of an interfacial particle raft

We study the collective behaviour of a close packed monolayer of non-Brownian particles at a fluid-liquid interface. Such a particle raft forms a two-dimensional elastic solid and can support anisotropic stresses and strains, e.g. it buckles in uniaxial compression and cracks in tension. We characterise this solid in terms of a Young's modulus and Poisson ratio derived from simple theoretical considerations and show the validity of these estimates by using an experimental buckling assay to deduce the Young's modulus.Comment: 7 pages, 5 figure

The Concept of History in the Thought of Rudolf Bultmann and Reinhold Niebuhr

The question of the nature and meaning of history has become increasingly important in contemporary thought. In theological circles, it has become the central theme of discussion. Thereare a number of reasons why this is so. The events of the times in which we live have brought about a definite rejection of any knowledge-equals-progress idea of history as well as a call for interpretation of the profound social crises which we confront. The widespread influence of existentialism, with its emphasis on relativism and subjectivism, has brought into question not only the nature of history, in terms of present reality, but also the validit of the historians\u27 pursuits. Beginning from the point of Christian ethics and giving considerable attention to the nature of man, [Reinhold] Niebuhr develops his concept of history quite differently from [Rudolf] Bultmann. It will be the task of this paper to examine the idea of history in the thought of each of these men and then, through a critique and comparison, evaluate each in terms of their strengths and weaknesses as well as their similarities and differences

Quantifying Forest Ground Flora Biomass Using Proximal Sensing

Current focus on forest conservation and forest sustainability has increased the level of attention given to measures of ground flora in forest ecosystems. Traditionally, such data are collected via time- and resource-intensive methods of field identification, clipping, and weighing. With increased focus on community composition and structure measures of forest ground flora, the manner in which these data are collected must change. This project uses color and color infrared digital cameras to proximally sense forest ground flora and to develop regression models to predict green and dry biomass (g/m^) from the proximally sensed data. Traditional vegetative indices such as the Normalized Difference Vegetative Index (NDVI) and the Average Visible Reflectance Index (AVR) explained 35-45% of the variation in forest ground flora biomass. Adding individual color band variables, especially the red and near infrared bands, to the regression model allowed the model to explain 66% and 58% of the variation in green and dry biomass, respectively, present

A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk

The water maser in the mildly active nucleus in the nearby galaxy NGC4258 traces a thin, nearly edge-on, subparsec-scale Keplerian disk. Using the technique of very long baseline interferometry, we have detected the proper motions of these masers as they sweep in front of the central black hole at an orbital velocity of about 1100 km/s. The average maser proper motion of 31.5 microarcseconds per year is used in conjunction with the observed acceleration of the masers to derive a purely geometric distance to the galaxy of 7.2 +- 0.3 Mpc. This is the most precise extragalactic distance measured to date, and, being independent of all other distance indicators, is likely to play an important role in calibrating the extragalactic distance scale.Comment: 11 pages, 3 figures. Accepted for publication in Natur

Aerodynamic Simulation of Ice Accretion on Airfoils

This report describes recent improvements in aerodynamic scaling and simulation of ice accretion on airfoils. Ice accretions were classified into four types on the basis of aerodynamic effects: roughness, horn, streamwise, and spanwise ridge. The NASA Icing Research Tunnel (IRT) was used to generate ice accretions within these four types using both subscale and full-scale models. Large-scale, pressurized windtunnel testing was performed using a 72-in.- (1.83-m-) chord, NACA 23012 airfoil model with high-fidelity, three-dimensional castings of the IRT ice accretions. Performance data were recorded over Reynolds numbers from 4.5 x 10(exp 6) to 15.9 x 10(exp 6) and Mach numbers from 0.10 to 0.28. Lower fidelity ice-accretion simulation methods were developed and tested on an 18-in.- (0.46-m-) chord NACA 23012 airfoil model in a small-scale wind tunnel at a lower Reynolds number. The aerodynamic accuracy of the lower fidelity, subscale ice simulations was validated against the full-scale results for a factor of 4 reduction in model scale and a factor of 8 reduction in Reynolds number. This research has defined the level of geometric fidelity required for artificial ice shapes to yield aerodynamic performance results to within a known level of uncertainty and has culminated in a proposed methodology for subscale iced-airfoil aerodynamic simulation

Autoregulation of yeast ribosomal proteins discovered by efficient search for feedback regulation

Post-transcriptional autoregulation of gene expression is common in bacteria but many fewer examples are known in eukaryotes. We used the yeast collection of genes fused to GFP as a rapid screen for examples of feedback regulation in ribosomal proteins by overexpressing a non-regulatable version of a gene and observing the effects on the expression of the GFP-fused version. We tested 95 ribosomal protein genes and found a wide continuum of effects, with 30% showing at least a 3-fold reduction in expression. Two genes, RPS22B and RPL1B, showed over a 10-fold repression. In both cases the cis-regulatory segment resides in the 5\u27 UTR of the gene as shown by placing that segment of the mRNA upstream of GFP alone and demonstrating it is sufficient to cause repression of GFP when the protein is over-expressed. Further analyses showed that the intron in the 5\u27 UTR of RPS22B is required for regulation, presumably because the protein inhibits splicing that is necessary for translation. The 5\u27 UTR of RPL1B contains a sequence and structure motif that is conserved in the binding sites of Rpl1 orthologs from bacteria to mammals, and mutations within the motif eliminate repression

Effect of High-Fidelity Ice Accretion Simulations on the Performance of a Full-Scale Airfoil Model

The simulation of ice accretion on a wing or other surface is often required for aerodynamic evaluation, particularly at small scale or low-Reynolds number. While there are commonly accepted practices for ice simulation, there are no established and validated guidelines. The purpose of this article is to report the results of an experimental study establishing a high-fidelity, full-scale, iced-airfoil aerodynamic performance database. This research was conducted as a part of a larger program with the goal of developing subscale aerodynamic simulation methods for iced airfoils. Airfoil performance testing was carried out at the ONERA F1 pressurized wind tunnel using a 72-in. (1828.8-mm) chord NACA 23012 airfoil over a Reynolds number range of 4.5x10(exp 6) to 16.0 10(exp 6) and a Mach number range of 0.10 to 0.28. The high-fidelity, ice-casting simulations had a significant impact on the aerodynamic performance. A spanwise-ridge ice shape resulted in a maximum lift coefficient of 0.56 compared to the clean value of 1.85 at Re = 15.9x10(exp 6) and M = 0.20. Two roughness and streamwise shapes yielded maximum lift values in the range of 1.09 to 1.28, which was a relatively small variation compared to the differences in the ice geometry. The stalling characteristics of the two roughness and one streamwise ice simulation maintained the abrupt leading-edge stall type of the clean NACA 23012 airfoil, despite the significant decrease in maximum lift. Changes in Reynolds and Mach number over the large range tested had little effect on the iced-airfoil performance