RF transparent, energy absorbing, structural elements, phase II Final report, 5 Jun. 1963 - 16 Mar. 1964

Energy absorbing, structural elements having high specific energy absorption and low dielectric constant and loss tangent - space vehicle applicatio

Dark Radiation Emerging After Big Bang Nucleosynthesis?

We show how recent data from observations of the cosmic microwave background may suggest the presence of additional radiation density which appeared after big bang nucleosynthesis. We propose a general scheme by which this radiation could be produced from the decay of non-relativistic matter, we place constraints on the properties of such matter, and we give specific examples of scenarios in which this general scheme may be realized.Comment: v3: 5 pages, 1 figure. References added, typos corrected, notation changed throughout. v2: 5 pages, 1 figure. Reformatted, references added, acknowledgments updated, effect of radiation on CMB clarified. v1: 11 pages, 1 figur

Marxism since the Communist manifesto

https://stars.library.ucf.edu/prism/1021/thumbnail.jp

Ceramic hibachis and serving dishes

None provided

Exploring (Mis)alignments between First-Year Students’ Expectations and Experiences

Understanding what expectations first-year students have for their first semester of college can help university faculty, staff, and administrators have a better understanding of how to best provide support and resources that meet the needs of their students and lay the necessary foundations for their academic and social success early on. Unfortunately, many students report a variety of social, academic, personal, and environmental experiences that do not fully match their expectations. The purpose of this study was to examine what expectations and experiences first-year college students had about their first semester and how they interpreted both alignments and misalignments between their expectations and experiences. The research questions of this study were explored in two phases using an explanatory sequential mixed method design. In phase one, quantitative matching pre- and post-surveys were given to traditional first-year students to understand what (mis)aligned expectations first-year students had at the beginning of their first semester of college (pre-survey), and what they reported experiencing (post-survey). For the first phase of the experiment, 96 participants completed all or most of the initial expectation survey and 52 participants completed the entire follow-up experience survey. A paired t-test analysis was conducted on the matching pre- and post-survey questions to explore which areas of student experiences had the most significant (mis)alignments. Using descriptive statistics, individuals were scored and assigned a (mis)alignment score, falling on a spectrum of having overestimated expectations (entered college with higher expectations, but reported lower experience scores), aligned expectations and experiences, or underestimated expectations (entered college with lower expectations, but reported higher experience scores). Six individuals representing the various (mis)alignment options were invited to an interview to explore how students with varying alignment and misalignment scores perceived their experiences and expectations. Thematic analysis was used to create six themes from the student interviews that provided a more in-depth understanding of the types of expectations students had for their college experience and how they felt about any (mis)alignments they might have experienced. The results of this study echo the general literature and research base on student expectations: 1) they do matter, 2) they come from a variety of sources, 3) they impact each individual student’s experience and perception of college in unique ways, and 4) students tend to hold higher expectations than they should. The results of this study indicated that academic and social expectation and experience (mis)alignments are the most significant for students. However, the results also indicated that (mis)alignments in expectations and experiences are not always a bad thing and can lead to the development of adaptability and resiliency skills that help students create more realistic expectations and decision-making processes in the future. Recommendations for future studies on expectations and experiences (mis)alignments could explore how to better utilize technology, social media, and student programming to help shape the student expectation formation process both before students move in and early in their college career to help them develop healthier and more realistic expectations overall

Nonlinear transport in moving fluids

AbstractThe time-dependent spread of contaminants in moving fluids is normally studied by computer-intensive discretized procedures which have some disadvantages. Application of the decomposition method allows a continuous, convenient, accurate procedure which works and extends to nonlinear and stochastic partial differential equations as well

The Ginzburg-Landau equation

AbstractThe decomposition method is applied to the Ginzburg-Landau equation

Intellectual property law and the protection of Indigenous Australian traditional knowledge in natural resources

This essay is not about native title (though it will get a brief mention). Rather, its subject is the potential means for protecting Indigenous traditional knowledge rights in natural resources, which arguably, at its core, is about the nature of the socio-political and, perhaps more importantly, the economic relationship between Indigenous peoples and non-Indigenous society in Australia. It is these relationships which form the two fundamental pillars of the study and understanding of Indigenous/non-Indigenous relations, particularly in all common law jurisdictions in North America, New Zealand, Australia and elsewhere, and probably wherever Indigenous lands have been conquered or otherwise settled by Europeans and others

Development of high energy density primary batteries 200 watt hours per pound total battery weight minimum Final report, 10 Jun. 1964 - 9 Jun. 1965

High energy density lithium-anode primary cells developed with energy-to-weight ratios over 200 watt hours per poun

Wavelength Dependent PSFs and their impact on Weak Lensing Measurements

We measure and model the wavelength dependence of the PSF in the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) survey. We find that PSF chromaticity is present in that redder stars appear smaller than bluer stars in the $g, r,$ and $i$-bands at the 1-2 per cent level and in the $z$ and $y$-bands at the 0.1-0.2 per cent level. From the color dependence of the PSF, we fit a model between the monochromatic PSF trace radius, $R$, and wavelength of the form $R(\lambda)\propto \lambda^{b}$. We find values of $b$ between -0.2 and -0.5, depending on the epoch and filter. This is consistent with the expectations of a turbulent atmosphere with an outer scale length of $\sim 10-100$ m, indicating that the atmosphere is dominating the chromaticity. We find evidence in the best seeing data that the optical system and detector also contribute some wavelength dependence. Meyers and Burchat (2015) showed that $b$ must be measured to an accuracy of $\sim 0.02$ not to dominate the systematic error budget of the Large Synoptic Survey Telescope (LSST) weak lensing (WL) survey. Using simple image simulations, we find that $b$ can be inferred with this accuracy in the $r$ and $i$-bands for all positions in the LSST field of view, assuming a stellar density of 1 star arcmin$^{-2}$ and that the optical PSF can be accurately modeled. Therefore, it is possible to correct for most, if not all, of the bias that the wavelength-dependent PSF will introduce into an LSST-like WL survey.Comment: 14 pages, 10 figures. Submitted to MNRAS. Comments welcom