Exploring Current and Projected Skills and Knowledge Areas to Meet U.S. Commercial Space Industry Needs

In 2007, the Committee on Meeting the Workforce Needs for the National Vision for Space Exploration published findings related to age and skills of the current National Aeronautics and Space Administration (NASA) workforce and projected potential expertise shortages as a result of retirement in the 2014-2015 time frame. In addition, the expanding commercial space industry in both the United States and Europe will likely create further demand for space experts in engineering and a variety of related fields. Although NASA contributes $162 million in funding for education programs annually, those programs target kindergarten through grade 12, not collegiate-level programs. Further, few aeronautical/aerospace departments focused on education related to the development of space technologies, a discipline known as astronautics, exist in the US. In 2009, Doule and Peeters, Professors at the International Space University, sought to determine the need for space-focused knowledge and skills to support the European Union (EU) space industry. The results of Doule and Peeters\u27 2009 survey indicate an EU desire for space-specific educational programs to meet the needs of their commercial space industry. The researchers called for additional quantitative and qualitative studies to assess the emerging EU space industry workforce requirements and how to adapt space education and training curriculum. The purpose of this study is to develop a proactive model to assist U.S. educational institutions meet the projected U.S. space industry human resource needs. Findings from the proposed mixed-methods research program are to identify current and anticipated knowledge areas and associated skill sets within the U.S. space industry, and sub-industry aspects, to guide future collegiate-level curriculum development. Results from presented findings will be used toward a partial least squares structural equation modeling (PLS-SEM) for use in informed managerial decision-making of current/forecasted U.S. space industry human resource dynamics

The impact of nighttime intensivists on medical intensive care unit infection-related indicators

In 2013, a before-and-after intervention study was conducted to evaluate the effect 24-hour intensivist coverage on length of stay and rates of catheter-associated urinary tract infection, central-line associated blood stream infection, and ventilator-associated events. Intensivist coverage for 24 hours did not decrease length of stay or result in a decrease in any specific infection rate.Infect. Control Hosp. Epidemiol. 2016;37(3):352–354</jats:p

4-Manifolds With Inequivalent Symplectic Forms and 3-Manifolds With Inequivalent Fibrations

We exhibit a closed, simply connected 4-manifold $X$ carrying two symplectic structures whose first Chern classes in $H^2 (X, \mathbb{Z})$ lie in disjoint orbits of the diffeomorphism group of $X$. Consequently, the moduli space of symplectic forms on $X$ is disconnected. The example $X$ is in turn based on a 3-manifold $M$. The symplectic structures on $X$ come from a pair of fibrations $\pi_0, \pi_1 : M \rightarrow S^1$ whose Euler classes lie in disjoint orbits for the action of $\mathrm{Diff}(M)$ on $H_1(M, \mathbb{R})$.Mathematic

A portable tent-cage for entomological field studies

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A note on sexing live specimens of Scolytus unispinosus Lec. (Scolytidae, Coleoptera)

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Elder Siblings and the Taming of Hyperbolic 3-Manifolds

A 3-manifold is tame if it is homeomorphic to the interior of a compact manifold with boundary. Marden’s conjecture asserts that any hyperbolic 3-manifold $\mathbb{M} = \mathbb{H}^3/\Gamma$ with $\pi_1(M)$ finitely-generated is tame. This paper presents a criterion for tameness. We show that wildness of $\mathbb{M}$ is detected by large-scale knotting of orbits of $\Gamma$. The elder sibling property prevents knotting and implies tameness by a Morse theory argument. We also show the elder sibling property holds for all convex cocompact groups and a strict form of it characterizes such groups.Mathematic

Accidental parabolics and relatively hyperbolic groups

By constructing, in the relative case, objects analoguous to Rips and Sela's canonical representatives, we prove that the set of images by morphisms without accidental parabolic, of a finitely presented group in a relatively hyperbolic group, is finite, up to conjugacy.Comment: Revision, 24 pages, 4 figure

Fatigue resistance of rat extraocular muscles does not depend on creatine kinase activity

BACKGROUND: Creatine kinase (CK) links phosphocreatine, an energy storage system, to cellular ATPases. CK activity serves as a temporal and spatial buffer for ATP content, particularly in fast-twitch skeletal muscles. The extraocular muscles are notoriously fast and active, suggesting the need for efficient ATP buffering. This study tested the hypotheses that (1) CK isoform expression and activity in rat extraocular muscles would be higher, and (2) the resistance of these muscles to fatigue would depend on CK activity. RESULTS: We found that mRNA and protein levels for cytosolic and mitochondrial CK isoforms were lower in the extraocular muscles than in extensor digitorum longus (EDL). Total CK activity was correspondingly decreased in the extraocular muscles. Moreover, cytoskeletal components of the sarcomeric M line, where a fraction of CK activity is found, were downregulated in the extraocular muscles as was shown by immunocytochemistry and western blotting. CK inhibition significantly accelerated the development of fatigue in EDL muscle bundles, but had no major effect on the extraocular muscles. Searching for alternative ATP buffers that could compensate for the relative lack of CK in extraocular muscles, we determined that mRNAs for two adenylate kinase (AK) isoforms were expressed at higher levels in these muscles. Total AK activity was similar in EDL and extraocular muscles. CONCLUSION: These data indicate that the characteristic fatigue resistance of the extraocular muscles does not depend on CK activity

Influence of Logging on Douglas Fir Beetle Populations

All species of bark beetles of economic importance prefer to attack freshly-killed host material. Logging slash, wind-throw, and fire-killed timber provide ideal breeding grounds for bark beetles. A few species, mostly in the Dendroctonus group, are able to kill living trees. When beetles in the group, raised in preferred host material, cannot find any or enough freshly-killed trees, logs, or slash to enter, they may attack living trees. In the interior of British Columbia, infestations of the Douglas fir beetle can often be traced to logging disturbance

Geometrical Finiteness, Holography, and the BTZ Black Hole

We show how a theorem of Sullivan provides a precise mathematical statement of a 3d holographic principle, that is, the hyperbolic structure of a certain class of 3d manifolds is completely determined in terms of the corresponding Teichmuller space of the boundary. We explore the consequences of this theorem in the context of the Euclidean BTZ black hole in three dimensions.Comment: 6 pages, Latex, Version to appear in Physical Review Letter