An Initial Exploration of Improved Numerics within the Guidelines of the Negative Spalart-Allmaras Turbulence Model

A simple modification to the negative Spalart-Allmaras turbulence model is suggested so that when the turbulence working variable, ~v, is negative, diagonal dominance is increased, as is the tendency for the time-advancement scheme to push e toward positive values. Owing to the fact that the modification is only active when ~v is less than zero, the physical model is left unchanged. Using the proposed modification with a strong implicit solver based on Newton's method, convergence rates can be somewhat improved, with typical reductions in iterations and computer time on the order of 15-50%. The benefits are realized primarily when second- or higher-order accuracy is used for discretizing the convective terms in the turbulence model because of large overshoots that can occur with these schemes at the edges of boundary layers and wakes. For flowfields with few regions of negative ~v, or on very fine meshes where ~v is always greater than zero, little or no benefits should be expected

A new species of the perciform fish genus Symphysanodon (Symphysanodontidae) from the Arabian Sea off the southwestern coast of India

Symphysanodon xanthopterygion, new species, reported herein from 15 specimens collected near Quilon, India, off the Kerala Coast in the southeastern Arabian Sea, becomes the twelfth described species in the genus. The following characters in combination distinguish S. xanthopterygion from its congeners: parapophyses present on first caudal vertebra, total number of gillrakers on first arch 38 to 42, tubed lateral-line scales 54 to 59, sum of lateral-line scales plus total number of gillrakers in individual specimens 94 to 101, head length 33 to 37% SL, head depth 18 to 21% SL, snout length 5 to 6% SL, body depth 24 to 27% SL, lower caudal-fin lobe bright yellow

Results of the 2001 Becoming an Outdoor-Woman Survey

INHS Human Dimensions Research Program and Illinois Department of Natural Resourcesunpublishednot peer reviewedOpe

Results of the 2003-2004 Illinois Youth Hunter Survey

Federal Aid Project Number W-112-R-13, Job Number 103.1, Wildlife Restoration Fund, July 1, 2003 - Sept. 30, 2004Report issued on: December 22, 200

Examining Youth Conceptualizations of Water Safety Behaviors among Participants in a Learn-to-Swim Program

Drowning represents a leading cause of unintentional deaths among children. Concomitantly, while formal swim instruction often incorporates water safety practices, the efficacy of these messages remains largely unexplored. This qualitative-based study sought to evaluate how youth apply learned water safety concepts when posed with a hypothetical aquatic scenario. Semi-structured interviews, augmented by use of a visual illustration prompt, were conducted with 29 participants of a youth Learn-to-Swim (LTS) program. Interviews assessed participants’ expressed water safety behaviors and were coded based on emergent themes. Findings indicated that most participants were able to identify a “struggling” swimmer in the dramatized illustration. When questioned regarding their hypothetical behavioral response to that swimmer in trouble, participants ultimately yielded appropriate behaviors (e.g., extending one’s reach) with prompting, revealing they would eventually enter the water. Additionally, participants also frequently mis-conceptualized or reported hesitancy in other behaviors; for instance, “calling” for help was sometimes misinterpreted to exclude contacting 911. Results also indicated that other sources, such as television, were important sources of water safety knowledge among participants and that relationships with social agents played a role in water safety messaging. Given these results, LTS programs and public health agencies should work to further improve the prioritization, practice, and communication of water safety behaviors

A Cause to Action: Learning to Develop a Culturally Responsive/Relevant Approach to 21st Century Water Safety Messaging through Collaborative Partnerships

Globally, and in the United States, drowning is considered a “neglected public health threat” (WHO, 2014b). Reports have shown that there are groups of people in certain communities who are at greater risk. African Americans, as a group, have a drowning death rate 9% higher than that of the overall population, with the greatest disparity being among African American youth (Gilchrist & Parker, 2014). While many national programs and organizations present water safety awareness and drowning prevention efforts within communities, very few offer multi-sectorial collaborative efforts (WHO, 2017a) among culturally and linguistically diverse (CLD) aquatic stakeholders designed to empower, promote, and support water safety awareness in communities. Inspired by evidence-based research, derived from a national water safety and drowning prevention campaign, the purpose of this article is to answer a call to action by the World Health Organization (2017a) to approach water safety education through a social justice lens to inform programming and collaborative partnerships

Partial-Transfer Absorption Imaging: A versatile technique for optimal imaging of ultracold gases

Partial-transfer absorption imaging is a tool that enables optimal imaging of atomic clouds for a wide range of optical depths. In contrast to standard absorption imaging, the technique can be minimally-destructive and can be used to obtain multiple successive images of the same sample. The technique involves transferring a small fraction of the sample from an initial internal atomic state to an auxiliary state and subsequently imaging that fraction absorptively on a cycling transition. The atoms remaining in the initial state are essentially unaffected. We demonstrate the technique, discuss its applicability, and compare its performance as a minimally-destructive technique to that of phase-contrast imaging.Comment: 10 pages, 5 figures, submitted to Review of Scientific Instrument