A study of the effect of light on the oxygen content of the headspace of glasspacked fruit juices.

Thesis (M.S.

Safehold Attitude Determination Approach for GPM

Spacecraft sating designs generally have minimal goals with loose pointing requirements. Safe pointing orientations for three-axis stabilized spacecraft are usually chosen to put the spacecraft into a thermally safe and power-positive orientation. In addition, safe mode designs are required to be simple and reliable. This simplicity lends itself to the usage of analog sun sensors, because digital sun sensors will add unwanted complexity to the safe hold mode. The Global Precipitation Measurement (GPM) Mission Core Observatory will launch into lower earth orbit (LEO) at an inclination of 65 degrees. The GPM instrument suite consists of an active radar system and a passive microwave imager to provide the next-generation global observations of rain and snow. The complexity and precision of these instruments along with the operational constraints of the mission result in tight pointing requirements during all phases of the mission. To ensure the instruments are not damaged during spacecraft safing, thermal constraints dictate that the solar pointing orientation must be maintained to better than 6.5 degrees. This requirement is outside the capabilities of a typical analog sun sensor suite, primarily due to the effects of Earth's albedo. To ensure mission success, a new analog sensor, along with the appropriate algorithms, is needed. This paper discusses the design issues involving albedo effects on spacecraft pointing and the development of a simple, low-cost analog sensor and algorithm that will address the needs of the GPM mission. In addition, the algorithms are designed to be easily integrated into the existing attitude determination software by using common interfaces. The sensor design is based on a heritage, commercial off-the-shelf analog sun sensors with a limited field-of-view to reduce the effects of Earth's albedo. High fidelity simulation results are presented that demonstrate the efficacy of the design

Teachers’ Understandings of Critical and Higher Order Thinking and What This Means for Their Teaching and Assessments

Critical and higher order thinking is essential to education, but it is not clear what teachers understand this to mean and what role this has in their instruction. We interviewed 38 teachers in Kindergarten to Grade 9 classrooms from 14 schools in Newfoundland and Labrador, Canada, to obtain their understandings of critical and higher order thinking in social studies and science, and how this affects instruction and assessment. The teachers believed that higher order thinking was important for all students, and attempted to teach thinking; however, they were less sure of how they might assess thinking. The teachers indicated uncertainty about what higher order thinking means, and believed they were not well prepared to teach or assess higher order thinking.L’esprit critique et les habiletés supérieures de la pensée sont des éléments essentiels de l’éducation; pourtant, il n’est pas clair si les enseignants comprennent ces concepts ou le rôle que jouent ceux-ci dans leur enseignement. Nous avons interrogé 38 enseignants de la maternelle à la 9e année et provenant de 14 écoles à Terre-Neuve-et-Labrador, au Canada, de sorte à apprendre comment ils concevaient l’esprit critique et les habiletés supérieures de la pensée en études sociales et en science, et dans quelle mesure leur perception affectait l’enseignement et l’évaluation. Les enseignants croyaient que les habiletés supérieures de la pensée étaient importantes pour tous les élèves et ils tentaient d’enseigner la réflexion ; toutefois, ils étaient moins certains quant à la façon d’évaluer celle-ci. Les enseignants ont manifesté une incertitude quant à la définition des habiletés supérieures de la pensée et estimaient qu’ils n’étaient pas bien préparés pour les enseigner ou les évaluer.

Teachers’ Understandings of Critical and Higher Order Thinking and What This Means for Their Teaching and Assessments

Critical and higher order thinking is essential to education, but it is not clear what teachers understand this to mean and what role this has in their instruction. We interviewed 38 teachers in Kindergarten to Grade 9 classrooms from 14 schools in Newfoundland and Labrador, Canada, to obtain their understandings of critical and higher order thinking in social studies and science, and how this affects instruction and assessment. The teachers believed that higher order thinking was important for all students, and attempted to teach thinking; however, they were less sure of how they might assess thinking. The teachers indicated uncertainty about what higher order thinking means, and believed they were not well prepared to teach or assess higher order thinking.L’esprit critique et les habiletés supérieures de la pensée sont des éléments essentiels de l’éducation; pourtant, il n’est pas clair si les enseignants comprennent ces concepts ou le rôle que jouent ceux-ci dans leur enseignement. Nous avons interrogé 38 enseignants de la maternelle à la 9e année et provenant de 14 écoles à Terre-Neuve-et-Labrador, au Canada, de sorte à apprendre comment ils concevaient l’esprit critique et les habiletés supérieures de la pensée en études sociales et en science, et dans quelle mesure leur perception affectait l’enseignement et l’évaluation. Les enseignants croyaient que les habiletés supérieures de la pensée étaient importantes pour tous les élèves et ils tentaient d’enseigner la réflexion ; toutefois, ils étaient moins certains quant à la façon d’évaluer celle-ci. Les enseignants ont manifesté une incertitude quant à la définition des habiletés supérieures de la pensée et estimaient qu’ils n’étaient pas bien préparés pour les enseigner ou les évaluer.

XO-2b: a hot Jupiter with a variable host star that potentially affects its measured transit depth

The transiting hot Jupiter XO-2b is an ideal target for multi-object photometry and spectroscopy as it has a relatively bright ($V$-mag = 11.25) K0V host star (XO-2N) and a large planet-to-star contrast ratio (R$_{p}$/R$_{s}\approx0.015$). It also has a nearby (31.21") binary stellar companion (XO-2S) of nearly the same brightness ($V$-mag = 11.20) and spectral type (G9V), allowing for the characterization and removal of shared systematic errors (e.g., airmass brightness variations). We have therefore conducted a multiyear (2012--2015) study of XO-2b with the University of Arizona's 61" (1.55~m) Kuiper Telescope and Mont4k CCD in the Bessel U and Harris B photometric passbands to measure its Rayleigh scattering slope to place upper limits on the pressure-dependent radius at, e.g., 10~bar. Such measurements are needed to constrain its derived molecular abundances from primary transit observations. We have also been monitoring XO-2N since the 2013--2014 winter season with Tennessee State University's Celestron-14 (0.36~m) automated imaging telescope to investigate stellar variability, which could affect XO-2b's transit depth. Our observations indicate that XO-2N is variable, potentially due to {cool star} spots, {with a peak-to-peak amplitude of $0.0049 \pm 0.0007$~R-mag and a period of $29.89 \pm 0.16$~days for the 2013--2014 observing season and a peak-to-peak amplitude of $0.0035 \pm 0.0007$~R-mag and $27.34 \pm 0.21$~day period for the 2014--2015 observing season. Because of} the likely influence of XO-2N's variability on the derivation of XO-2b's transit depth, we cannot bin multiple nights of data to decrease our uncertainties, preventing us from constraining its gas abundances. This study demonstrates that long-term monitoring programs of exoplanet host stars are crucial for understanding host star variability.Comment: published in ApJ, 9 pages, 11 figures, 3 tables; updated figures with more ground-based monitoring, added more citations to previous work

Integrating Cognitive Science with Innovative Teaching in STEM Disciplines

This volume collects the ideas and insights discussed at a novel conference, the Integrating Cognitive Science with Innovative Teaching in STEM Disciplines Conference, which was held September 27-28, 2012 at Washington University in St. Louis. With funding from the James S. McDonnell Foundation, the conference was hosted by Washington University’s Center for Integrative Research on Cognition, Learning, and Education (CIRCLE), a center established in 2011. Available for download as a PDF. Titles of individual chapters can be found at http://openscholarship.wustl.edu/circle_book/.https://openscholarship.wustl.edu/books/1009/thumbnail.jp

Necessary fictions: indigenous claims and the humanity of rights

Indigenous right insistently challenges the surpassing arrogations of sovereign right. In so doing, it affirms dimensions of being-together denied or stunted in sovereign modes of political formation. This force of Indigenous right is amplified here through legal and literary instantiations. These, in turn, uncover the continuously created and fictional quality of rights, revealing them to be necessary fictions

Biological Properties and Health-Promoting Functions of Laminarin: A Comprehensive Review of Preclinical and Clinical Studies

Marine algal species comprise of a large portion of polysaccharides which have shown multifunctional properties and health benefits for treating and preventing human diseases. Laminarin, or β-glucan, a storage polysaccharide from brown algae, has been reported to have potential pharmacological properties such as antioxidant, anti-tumor, anti-coagulant, anticancer, immunomodulatory, anti-obesity, anti-diabetic, anti-inflammatory, wound healing, and neuroprotective potential. It has been widely investigated as a functional material in biomedical applications as it is biodegradable, biocompatible, and is low toxic substances. The reported preclinical and clinical studies demonstrate the potential of laminarin as natural alternative agents in biomedical and industrial applications such as nutraceuticals, pharmaceuticals, functional food, drug development/delivery, and cosmeceuticals. This review summarizes the biological activities of laminarin, including mechanisms of action, impacts on human health, and reported health benefits. Additionally, this review also provides an overview of recent advances and identifies gaps and opportunities for further research in this field. It further emphasizes the molecular characteristics and biological activities of laminarin in both preclinical and clinical settings for the prevention of the diseases and as potential therapeutic interventions