Characterization of Bending Magnetostriction in Iron-Gallium Alloys for Nanowire Sensor Applications

This research explores the possibility of using electrochemically deposited nanowires of magnetostrictive iron-gallium (Galfenol) to mimic the sensing capabilities of biological cilia. Sensor design calls for incorporating Galfenol nanowires cantilevered from a membrane and attached to a conventional magnetic field sensor. As the wires deflect in response to acoustic, airflow, or tactile excitation, the resultant bending stresses induce changes in magnetization that due to the scale of the nanowires offer the potential for excellent spatial resolution and frequency bandwidth. In order to determine the suitability for using Galfenol nanowires in this role, the first task was experimentally characterizing magnetostrictive transduction in bending beam structures, as this means of operation has been unattainable in previous materials research due to low tensile strengths in conventional alloys such as Terfenol-D. Results show that there is an appreciable sensing response from cantilevered Galfenol beams and that this phenomenon can be accurately modeled with an energy based formulation. For progressing experiments to the nanowire scale, a nanomanipulation instrument was designed and constructed that interfaces within a scanning electron microscope and allows for real time characterization of individual wires with diameters near 100 nm. The results of mechanical tensile testing and dynamic resonance identification reveal that the Galfenol nanowires behave similarly to the bulk material with the exception of a large increase in ultimate tensile strength. The magnetic domain structure of the nanowires was theoretically predicted and verified with magnetic force microscopy. An experimental methodology was developed to observe the coupling between bending stress and magnetization that is critical for accurate sensing, and the key results indicate that specific structural modifications need to be made to reduce the anisotropy in the nanowires in order to improve the transduction capabilities. A solution to this problem is presented and final experiments are performed

Formative Research to Inform the Development of a Healthy Eating Social Marketing Campaign in Mississippi

Mississippi leads the nation in child obesity, chronic diseases, poverty, and food insecurity. Stemming the long-term consequences of high obesity rates will require a cultural attitude and behavioral shift towards healthy eating. This study explored the perceptions, beliefs, practices, and self-efficacy towards healthy eating among limited resource Mississippi parents to inform a SNAP-Ed social marketing campaign. A statewide telephone survey was conducted with income-eligible or current SNAP recipients who provided or prepared food for children in their household. Likert-type scale questions measured intrapersonal factors, self-efficacy, and practices regarding healthy eating, such as shopping and meal planning. A total of 206 surveys were analyzed. Seventy-nine percent (n=163) of participants were currently receiving SNAP benefits. Healthy eating was perceived as balanced meals and fruits and vegetables. Though 60% agreed that cost was a barrier to eating more fruits and vegetables, 90% of participants had positive attitudes and beliefs towards healthy eating. In summary, Mississippi parents with limited resources were interested in providing healthy balanced meals but faced cost as the major barrier. A social marketing message with this population can be effective in emphasizing affordable healthy meals

An Investigation of the UL-94V Plastics Flammability Test

The UL-94 Vertical Burning Flammability Test (UL-94V) is used to measure flammability characteristics of plastic materials. The results of the test allow for plastic materials to be separated into classification categories. These categories will be discussed and related to fire phenomena. Simulations of the test have allowed for the development of general flame height and heat flux correlations. We believe these are independent of the actual solid fuels. In addition, the heat flux from the ignition burner, a specified premixed flame, has been measured. These data provide the basis for assessing fire behavior of materials using their fire properties such as heat of combustion, heat of gasification, ignition temperature, and thermal properties. Criteria for ignition, sustained burning, and flame spread are determined. These outcomes are then related to the UL-94V classification categories. An analysis of melting is also considered in order to assess the flaming drip aspect of the test

Distribution and Mean Length of Gizzard Shad (Dorosoma Cepedianum) and Some Aspects of the Sampling Problem in Lake Carl Blackwell, Oklahoma

The primary objective of this research was to describe horizontal and vertical distribution of larval gizzard shad (Dorosoma cepedianum) in Lake Carl Blackwell, Oklahoma. This information is basic to the study of year-class formation of gizzard shad. Some recommendations for future sampling of the lake are given.Zoolog

Engaging Researchers in Data Dialogues: Designing Collaborative Programming to Promote Research Data Sharing

A range of regulatory pressures emanating from funding agencies and scholarly journals increasingly encourage researchers to engage in formal data sharing practices. As academic libraries continue to refine their role in supporting researchers in this data sharing space, one particular challenge has been finding new ways to meaningfully engage with campus researchers. Libraries help shape norms and encourage data sharing through education and training, and there has been significant growth in the services these institutions are able to provide and the ways in which library staff are able to collaborate and communicate with researchers. Evidence also suggests that within disciplines, normative pressures and expectations around professional conduct have a significant impact on data sharing behaviors (Kim and Adler 2015; Sigit Sayogo and Pardo 2013; Zenk-Moltgen et al. 2018). Duke University Libraries\u27 Research Data Management program has recently centered part of its outreach strategy on leveraging peer networks and social modeling to encourage and normalize robust data sharing practices among campus researchers. The program has hosted two panel discussions on issues related to data management—specifically, data sharing and research reproducibility. This paper reflects on some lessons learned from these outreach efforts and outlines next steps

United States v. Robinson

This article provides an overview of fourth amendment litigation that focused on the question of what constitutes an “unreasonable” search. The Supreme Court had previously provided guidance in Terry v. Ohio and Chimel v. California. This article provides a brief overview of these cases, and then it turns to more thoroughly examine the decision in US v. Robinson

KDC1, a Novel Carrot Root Hair K+Channel CLONING, CHARACTERIZATION, AND EXPRESSION IN MAMMALIAN CELLS

Potassium is an essential nutrient which plays an important role in many aspects of plant growth and development. Plants have developed a number of highly specific mechanisms to take up potassium from the soil; these include the expression of K+ transporters and potassium channels in root cells. Despite the fact that root epidermal and hair cells are in direct contact with the soil, the role of these tissues in K+uptake is not well understood. Here we report the molecular cloning and functional characterization of a novel potassium channel KDC1 which forms part of a new subfamily of plant Kinchannels. Kdc1 was isolated from carrot root RNA andin situ hybridization experiments show Kdc1 to be highly expressed in root hair cells. Expressing the KDC1 protein in Chinese hamster ovary cells identified it as a voltage and pH-dependent inwardly rectifying potassium channel. An electrophysiological analysis of carrot root hair protoplasts confirmed the biophysical properties of the Kdc1 gene product (KDC1) in the heterologous expression system. KDC1 thus represents a major K+ uptake channel in carrot root hair cells