No Smoking Guns Here: Residence Life Directors' Perspectives on Concealed Carry in On-Campus Living Communities

The role of student affairs educators is to ensure that students not only obtain an educational experience, but also that out-of-classroom experiences contribute to holistic development. In particular, student affairs professionals often coordinate residential living, student activities, and advising programs. These programmatic offerings need to account for the diversifying student body and respond to shifting political landscapes. Student affairs practitioners face daily dilemmas that require decisions grounded in multicultural competent critical thinking and acute awareness (Pope, Reynolds, & Mueller, 2004; Watt, 2015). An area engendering more attention is the role of concealed carry weapons on college campuses. The emergence of gun violence within college and university settings beginning in 2007 with the Virginia Tech shootings launched myriad discussions about prevention and accountability among campus leadership, concerned citizens, and state legislatures. Within student affairs, conversations about students' safety always have been a priority, so addressing gun violence on campus moved higher on the discussion list. [Discussion questions developed by Alyse Gray Parker.

Fast Hands-free Writing by Gaze Direction

We describe a method for text entry based on inverse arithmetic coding that relies on gaze direction and which is faster and more accurate than using an on-screen keyboard. These benefits are derived from two innovations: the writing task is matched to the capabilities of the eye, and a language model is used to make predictable words and phrases easier to write.Comment: 3 pages. Final versio

Chemotaxis of Arbacia punctulata spermatozoa to resact, a peptide from the egg jelly layer

Resact, a peptide of known sequence isolated from the jelly layer of Arbacia punctulata eggs, is a potent chemoattractant for A. punctulata spermatozoa. The chemotactic response is concentration dependent, is abolished by pretreatment of the spermatozoa with resact, and shows an absolute requirement for millimolar external calcium. A. punctulata spermatozoa do not respond to speract, a peptide isolated from the jelly layer of Strongylocentrotus purpuratus eggs. This is the first report of animal sperm chemotaxis in response to a defined egg-derived molecule

Escape path complexity and its context dependency in Pacific blue-eyes (Pseudomugil signifer)

The escape trajectories animals take following a predatory attack appear to show high degrees of apparent 'randomness' - a property that has been described as 'protean behaviour'. Here we present a method of quantifying the escape trajectories of individual animals using a path complexity approach. When fish (Pseudomugil signifer) were attacked either on their own or in groups, we find that an individual's path rapidly increases in entropy (our measure of complexity) following the attack. For individuals on their own, this entropy remains elevated (indicating a more random path) for a sustained period (10 seconds) after the attack, whilst it falls more quickly for individuals in groups. The entropy of the path is context dependent. When attacks towards single fish come from greater distances, a fish's path shows less complexity compared to attacks that come from short range. This context dependency effect did not exist, however, when individuals were in groups. Nor did the path complexity of individuals in groups depend on a fish's local density of neighbours. We separate out the components of speed and direction changes to determine which of these components contributes to the overall increase in path complexity following an attack. We found that both speed and direction measures contribute similarly to an individual's path's complexity in absolute terms. Our work highlights the adaptive behavioural tactics that animals use to avoid predators and also provides a novel method for quantifying the escape trajectories of animals.Comment: 9 page

CCS Imaging of the Starless Core L1544: An Envelope with Infall and Rotation

We have carried out observations of the starless core L1544 in the CCS (J_N=3_2-2_1) line at 9 millimeters wavelength using the BIMA array. The maps show an elongated condensation, 0.15 x 0.045 pc in size, with stronger emission at the edges. The appearance is consistent with a flattened, ringlike structure viewed at high inclination to the line of sight. The CCS molecule is likely heavily depleted in the inner part of the core. The position velocity diagram along the major axis shows a remarkable pattern, a "tilted ellipse", that can be reproduced by a simple model ring with motions of both infall and rotation. The models suggest comparable velocities for infall and rotation, ~0.1 km/s, in the outermost envelope, at radius 15000 AU.Comment: 14 pages, 4 figures, AAS-LaTex v4.0, will be published in ApJ

Automated precision alignment of optical components for hydroxide catalysis bonding

We describe an interferometric system that can measure the alignment and separation of a polished face of a optical component and an adjacent polished surface. Accuracies achieved are ∼ 1μrad for the relative angles in two orthogonal directions and ∼ 30μm in separation. We describe the use of this readout system to automate the process of hydroxide catalysis bonding of a fused-silica component to a fused-silica baseplate. The complete alignment and bonding sequence was typically achieved in a timescale of a few minutes, followed by an initial cure of 10 minutes. A series of bonds were performed using two fluids - a simple sodium hydroxide solution and a sodium hydroxide solution with some sodium silicate solution added. In each case we achieved final bonded component angular alignment within 10 μrad and position in the critical direction within 4 μm of the planned targets. The small movements of the component during the initial bonding and curing phases were monitored. The bonds made using the sodium silicate mixture achieved their final bonded alignment over a period of ∼ 15 hours. Bonds using the simple sodium hydroxide solution achieved their final alignment in a much shorter time of a few minutes. The automated system promises to speed the manufacture of precision-aligned assemblies using hydroxide catalysis bonding by more than an order of magnitude over the more manual approach used to build the optical interferometer at the heart of the recent ESA LISA Pathfinder technology demonstrator mission. This novel approach will be key to the time-efficient and low-risk manufacture of the complex optical systems needed for the forthcoming ESA spaceborne gravitational waves observatory mission, provisionally named LISA

Scalar--Flat Lorentzian Einstein--Weyl Spaces

We find all three-dimensional Einstein--Weyl spaces with the vanishing scalar curvatureComment: 4 page

Additions to, and a review of, the Miocene shark and ray fauna of Malta

Bulk sampling sediments and surface picking have increased the number of fossil sharks and rays from the Miocene of the Maltese Islands by 10 species and confirmed another. These are: Sphyrna arambourgi, Rhizoprionodon taxandriae, Scyliorhinus sp, Chaenogaleus afjinis, Galeorhinus goncalvesi, Triakis angustidens, Squatina sp., Rhynchobatus pristinus, Raja gentili and Gymnura sp. Hexanchus griseus was confirmed. The species "Galeocerdo" aduncus is synonymised with "G" contortus, and referred to the genus Physogaleus. These new records, and a taxonomic revision of the species described previously, increased the Maltese fauna to 24 species, comparable with the Miocene of France and Portugal. This paper is not meant to be an exhaustive review of the fossil selachian and batid fauna of the Maltese Islands but rather for the present we have confined ourselves to revising Menesini (1974).peer-reviewe