Notes on the Biology of Invasive Lionfish (Pterois sp.) from the Northcentral Gulf of Mexico

The first confirmed sightings of lionfish in the Gulf of Mexico occurred in 2010 (Schofield 2010), where they were reported in the southern GOM off the Yucatan Peninsula, Mexico (Aguilar-Perera and Tuz-Sulub 2010); in 2012 more than 1,500 lionfish were collected from northern GOM locations ranging from Florida to Texas (Fogg et al. 2013). However, other than visual observations (mostly from recreational divers), there is relatively little information on the biology and ecology of lionfish in the northern GOM. The life history of invasive species can vary as they colonize new habitats and areas (Bøhn et al. 2004); thus, biological parameters described for lionfish along the US southeast coast, the Bahamas, and the Caribbean may differ as the species invades the GOM. Recently, Fogg et al. (2013) provided information on length-weight and sex ratios of northern GOM lionfish. Here, we report biological data from 4 lionfish captured during fishery-independent sampling in nearshore GOM waters off Alabama in May 2012

Asymptotically-Optimal Topological Nearest-Neighbor Filtering

Nearest-neighbor finding is a major bottleneck for sampling-based motion planning algorithms. The cost of finding nearest neighbors grows with the size of the roadmap, leading to a significant computational bottleneck for problems which require many configurations to find a solution. In this work, we develop a method of mapping configurations of a jointed robot to neighborhoods in the workspace that supports fast search for configurations in nearby neighborhoods. This expedites nearest-neighbor search by locating a small set of the most likely candidates for connecting to the query with a local plan. We show that this filtering technique can preserve asymptotically-optimal guarantees with modest requirements on the distance metric. We demonstrate the method’s efficacy in planning problems for rigid bodies and both fixed and mobile-base manipulators

Topology-Guided Roadmap Construction With Dynamic Region Sampling

Many types of planning problems require discovery of multiple pathways through the environment, such as multi-robot coordination or protein ligand binding. The Probabilistic Roadmap (PRM) algorithm is a powerful tool for this case, but often cannot efficiently connect the roadmap in the presence of narrow passages. In this letter, we present a guidance mechanism that encourages the rapid construction of well-connected roadmaps with PRM methods. We leverage a topological skeleton of the workspace to track the algorithm\u27s progress in both covering and connecting distinct neighborhoods, and employ this information to focus computation on the uncovered and unconnected regions. We demonstrate how this guidance improves PRM\u27s efficiency in building a roadmap that can answer multiple queries in both robotics and protein ligand binding applications

An Investigation of ETDs as Prior Publications: Findings from the 2011 NDLTD Publishers’ Survey

Do publishers and editors of scholarly journals view theses and dissertations that are readily available on the Internet and through convenient Web browsers as prior publications? This has been a topic of discussion for well over a decade in the ETD community, not only of concern to graduate schools and libraries but also among research faculty and their graduate students. At the same time that a growing number of universities worldwide are requiring ETDs and making the research and scholarship of their graduate students publicly available, many faculty advise their students to restrict online access to their theses and dissertations due to concerns about future publication options. This paper reports on the 2011 survey results of journal editors\u27 and university press directors\u27 attitudes toward online theses and dissertations. This data and the open-ended comments from the survey respondents indicate support for open access to ETDs

Americans on Nuclear Weapons

A policymaking simulation is an online process that puts citizens in the shoes of elected officials by simulating the process they go through in making policy decisions. Each simulation introduces a broader policy topic and then presents a series of modules that address a specific policy option that is currently under consideration in the current discourse. For each module, respondents: 1) receive a short briefing on a policy issue and the option or options for addressing it; 2) evaluate arguments for and against the policy options; and 3) finally, make their recommendation for what their elected officials should do.US-Russian Arms Control Treaties: More than eight in ten favor the US continuing to have arms control treaties with Russia, with support among Republicans comparable to that of Democrats. Extending New START: Eight in ten favor the United States agreeing to extend the New START Treaty. Intermediate-Range Nuclear Forces (INF) Treaty: Two thirds, including a majority of Republicans, oppose withdrawing from the INF Treaty and favor instead staying within the Treaty and redoubling efforts to work with the Russians to address concerns of both sides. Nuclear Weapons Testing: Overwhelming majorities from both parties approve of the US continuing its moratorium on nuclear testing, effectively abiding by the 1996 Comprehensive Nuclear Test Ban Treaty. In the event the US develops a technological innovation that might make it possible to build a new type of nuclear weapon that could destroy more of an adversary’s nuclear weapons, a majority still said they would oppose breaking the moratorium, though a bare majority of Republicans favored it. US NUCLEAR WEAPONS CAPABILITIES: Minimum Retaliatory Capability: Eight in ten or more from both parties support the US having a retaliatory nuclear capability destructive enough that no country could think that there would be any advantage in attacking the United States with nuclear weapons. Low Yield Warheads and the Need for Matching Nuclear Options Respondents were presented a rationale for developing nuclear capabilities over and above the minimum retaliatory capability based on the need to threaten to match any type of nuclear capability an adversary might use. When presented a specific example of the current debate over whether the US should put low-yield nuclear warheads on missiles on submarines to match corresponding Russian capabilities, a bipartisan majority of two-thirds supported adding a low-yield option to nuclear missiles on submarines. Yet, when asked about the general principle, a plurality endorsed the view that a minimum retaliatory capability is adequate, over the view that the US must have the capability to retaliate against a major attack using only a type of weapon similar to the type the adversary used. Inter-Continental Ballistic Missiles (ICBMs): Knowing that the United States currently has strategic weapons on submarines, bombers, and land-based intercontinental ballistic missiles, six in ten, including a majority of Republicans, favor phasing out the ICBM force. However, only one-third favor unilaterally reducing the net number of strategic warheads in the U.S. arsenal instead of putting more warheads on submarines and bombers to keep the same total as the Russians. FIRST USE OF NUCLEAR WEAPONS: US Declaratory Policy on First Use: Only one in five endorsed the United States explicitly declaring that it would consider using nuclear weapons first and stating what kinds of non-nuclear attacks would prompt the United States to consider doing so. Just slightly more than one in five favored explicitly declaring that the United States will never use nuclear weapons first. A majority favored continuing the current policy of being ambiguous about whether and under what conditions the United States would consider using nuclear weapons first. Presented a list of possible types of attack, less than one in six favored declaring that the United States would consider using nuclear weapons in response to any of them. Limiting Presidential First Use: Two thirds, including six in ten Republicans, support Congressional legislation requiring that to use nuclear weapons first, the President would first have to consult Congress and it would have to issue a declaration of war on the country to be attacked with nuclear weapons.CENTER FOR INTERNATIONAL & SECURITY STUDIE

Daily College Student Drinking Patterns Across the First Year of College

Objective: Despite the long recognized importance and well-documented impact of drinking patterns on health and safety, college student drinking patterns are understudied. This study used a daily-level, academic-year-long, multisite sample to identify subpopulations of college student drinking patterns and to describe how these groups differ from one another before, during, and after their first year of college. Method: wo cohorts of first-year college students (n = 588; 59% female) reported daily drinking on a biweekly basis using web-based surveys and completed surveys before and after their first year of college. Results: Cluster analyses based on time series analysis estimates of within-person drinking differences (per weekday, semester, first 6 weeks) and other descriptors of day-to-day drinking identified five drinking patterns: two low (47% and 6%), two medium (24% and 15%), and one high (8%) drinking cluster. Multinomial logistic regression analyses examined cluster differences in pre-college characteristics (i.e., demographics, alcohol outcome expectancies, alcohol problems, depression, other substance use) and first-year college experiences (i.e., academic engagement, alcohol consequences, risky drinking practices, alcohol problems, drinking during academic breaks). Low-drinking students appeared to form a relatively homogeneous group, whereas two distinct patterns were found for medium-drinking students with different weekend and Thursday drinking rates. The Thursday drinking cluster showed lower academic engagement and greater participation in risky drinking practices. Conclusions: These findings highlight quantitative and qualitative differences in day-to-day drinking patterns and suggest a link between motivational differences and drinking patterns, which may be addressed in developing tailored interventional strategies