Very large spontaneous electric polarization in BiFeO3 single crystals at room temperature and its evolution under cycling fields

Electric polarization loops are measured at room temperature on highly pure BiFeO3 single crystals synthesized by a flux growth method. Because the crystals have a high electrical resistivity, the resulting low leakage currents allow us to measure a large spontaneous polarization reaching 100 microC.cm^{-2}, a value never reported in the bulk. During electric cycling, the slow degradation of the material leads to an evolution of the hysteresis curves eventually preventing full saturation of the crystals.Comment: 8 pages, 3 figure

Effects of Long-Term Evolution Waveform on Synthetic Aperture Radar Image Quality Metrics

As a greater demand by the private sector for bandwidth drives spectrum allocations away from defense, new methods for coexistence in the spectrum are being explored. One of the prominent areas in defense for this coexistence is passive radar. This mode of radar system allows for data collection by referencing signals already established in the environment of interest. Some of the most prolific signals currently available are those used for mobile communication networks. In particular, Long- Term Evolution (LTE) is a common waveform that could be leveraged for discrete collection of image intelligence. Seeking to build a base of knowledge, simulations of synthetic aperture radar (SAR) systems are carried out using the LTE framework. Variations in waveform content, structure, and signal components are established and used to generate point-spread function (PSF) responses characterizing the image do- main impacts of given fluctuations. Overall, PSF responses for most variations are highly similar, incurring slight losses as pulses contain varied data types and slight gains when maximizing the amount of user data contained in pulses. Notable side- lobes in range profiles occur at predictable intervals and may be easily managed for adequately-sized scenes. Peak sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) results show marginal improvement when pulses are varied over the aperture. Range and cross-range resolution, while remaining mostly unchanged throughout variations, are observed to be worse in simulation than is expected. The work presented here is meant to serve as a starting point of overall LTE characterization as a radar waveform and establish basic metrics of comparison for future efforts

Eye Gaze and Cortisol Levels in Socially Anxious Young Adults During an Interactive Real World Task

Social anxiety is a disorder where people fear social interactions and is associated with physiological changes. Eye tracking studies have shown that people with social anxiety spent more time gazing at emotional faces presented on a computer screen and spent more time gazing at the eye region. There has been limited studies on tracking eye gaze in a real-life setting interacting with another person. We used a wearable eye tracker during a brief one-on-one interview about participants’ challenges faced at work or school. Along with self-report psychological measures about social anxiety and shyness, we also measured participants’ salivary cortisol as a metric for physiological stress. We hypothesized that socially anxious individuals would have higher cortisol levels and spent more time gazing at the face. However, there was no change in cortisol levels before and after the interview. In addition, socially anxious individuals had lower cortisol levels than less anxious people. Furthermore, the time spent fixating on the region of interest (ROI), which was the face, was not correlated with social anxiety, anxiety or shyness. Paradoxically, the more socially anxious participants seem to have had a lower physiological stress response than less socially anxious participants

A Return of the Threshing Ring? Motivations, Benefits and Challenges of Machinery and Labor Sharing Arrangements

Cooperative approaches provide an alternative for small- and medium-sized producers to obtain the efficiencies of large farming operations and remain competitive in an increasingly concentrated agricultural industry. This article examines the motivation and effectiveness of equipment and labor sharing arrangements in the Midwestern US. Case study evidence shows that in addition to cost savings, access to skilled, seasonal labor is an important motivation for farm-level cooperation. Key factors identified for successful cooperative agreements include compatibility of operations and members' willingness to communicate and adapt. Sharing resources is found to improve farm profitability, efficiency and farmers' quality of life.machinery sharing; skilled farm labor; productivity; farm-level cooperations

A Return of the Threshing Ring? A Case Study of Machinery and Labor-Sharing in Midwestern Farms

Machinery-sharing provides an alternative for smaller producers to obtain the efficiencies of large farming operations and remain competitive in an increasingly concentrated agricultural industry. This research uses a multiple case study design to examine the motivations for sharing equipment and labor among farms and to better understand how group members handle the transaction costs of sharing. Our case evidence finds that in addition to cost savings, access to reliable labor is an important motivation for participating in a sharing arrangement. Trust and frequent communication among group members helps to minimize the transaction costs incurred from sharing.machinery sharing, transaction costs, farm-level cooperation, Agribusiness, Agricultural Finance, Community/Rural/Urban Development, Crop Production/Industries, Farm Management, Financial Economics, Labor and Human Capital, Land Economics/Use, Production Economics, Productivity Analysis, Research and Development/Tech Change/Emerging Technologies, Q12, Q13,

Teacher Training on Teaching Students with Dyslexia

Dyslexia is a central educational issue that teachers are facing today; it is important that teachers receive specific training on how to meet the educational needs of students with dyslexia in their classrooms. The purpose of this study was to determine the amount of training that teachers have received, if there was a correlation between grade level and training, and if teachers have a desire for additional training. The main focus of the literature review includes an overview of dyslexia including the history and sign and symptoms. There was also an emphases on the dyslexia in the classroom, including teacher misconceptions, how to teach students with dyslexia, and the need for teacher training. The study asked teachers in a specific district to respond to a survey revolving around the amount of training they had received on how to teach students with dyslexia. The results of the survey indicated that the majority of teachers have not received an adequate amount to of training on how to meet the unique needs of students with dyslexia in their classrooms

Postcard from S. Chambers to Perry M. Colson

Postcard from S. Chambers to Perry M. Colson. The hand-written postcard is dated 13 November 1913. There is a transcript of the correspondence in the item PDF

Letter from M. L. Colson to B. R. Colson

Letter from M. L. Colson to B. R. Colson. The one-page handwritten note is dated 17 August 1909. There is a transcript of the correspondence in the item PDF

1 May 1913 property agreement

Agreement between G. M. D. Bowers, W. W. Colson, and B. R. Colson to hold Dixieland Park land for Theophilus Brown Larimore. The one-page typewritten document is dated 1 May 1913