Patterns and environmental drivers of juvenile sablefish movement in Southeast Alaska

Thesis (M.S.) University of Alaska Fairbanks, 2018Sablefish Anoplopoma fimbria are a long-lived, deep-dwelling groundfish that inhabit the North Pacific Ocean, ranging from northern Mexico to the Gulf of Alaska to Japan, supporting one of Alaska's most valuable commercial fisheries. After decades of heavy fishing, declines in the Sablefish population led to significant fishing restrictions but few strong year classes developed in recent years. Most Sablefish research has focused on the larval, near-surface juvenile, or adult life history stages, but few studies have examined post-settlement juvenile Sablefish in nearshore areas. This study used acoustic telemetry to understand the presence and movement of juvenile Sablefish in a nursery area in Southeast Alaska. Throughout the summer and fall of 2015 and 2016, 40 juvenile Sablefish implanted with acoustic transmitters were monitored using an array of eight fixed receivers in St. John Baptist Bay, Baranof Island, Alaska. We quantified the movement patterns of 28 juvenile Sablefish using displacement from the head of the bay, daily distance traveled, daily duration within the bay, unique movement types among individuals, and movement in relation to environmental variables. From these analyses, we show that juvenile Sablefish exhibit fidelity to the middle-head region of the bay, display relatively high rates of daily movement and residence, demonstrate three distinct movement patterns, and are influenced by environmental variables like water temperature, diel state, moon phase, and day of year. Our results show that juvenile Sablefish exhibit seasonality in movements as they progressively emigrate from the bay throughout the summer and fall. Certain factors were found to increase the likelihood of movement for juvenile Sablefish, perhaps allowing them to remain in suitable environmental conditions. This study fills a gap in our knowledge of Sablefish early life history and reinforces the importance of nursery areas like St. John Baptist Bay for juvenile Sablefish prior to recruitment into commercial fisheries.Alaska Department of Fish and Gam

Stress in the Work Place

A study was undertaken in an attempt to get answers to current questions on the impact of stress in the work place as perceived by company management and employees at different levels, but emphasizing views of persons in supervisory positions. Information was gathered in questionnaires submitted to 150 companies selected at random from telephone directories of Minneapolis and St. Paul, Minnesota. The survey was administered by college students majoring in business and drew 128 respondents representing a cross-section of occupations from 100 business concerns of varying size. When asked which factors contributed to stress, the preponderant response was heavy work load, cited by 44.5 percent. Other identifying factors are tabulated. Of the respondents, 60.7 percent of the males and 63.3 percent of the females were supervisors. The reported levels of stress related generally to the number of persons supervised

Geochemical characterization of endmember mantle components

Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2005This thesis uses trace elements and radiogenic isotope tracers to define elemental abundances in reservoirs of the Earth's mantle, including EM2 (the Enriched Mantle 2), as seen in the Samoan hotspot track, and DMM (the depleted upper mantle), which is sampled at mid-ocean ridges. Together these components comprise up to -50% of the total mantle mass. Much of the mantle's chemical heterogeneities are suspected to originate by either the removal of mass from the mantle (in the case of DMM) or the addition of mass to the mantle through subduction zones (in the case of EM2). We show that DMM represents mantle that 1) has been previously depleted by 2-3% melt removal, 2) mass-balances well with the continental crust, 3) has only 15% of the radiogenic heat production in primitive upper mantle and 4) can generate present-day ocean crust by 6% aggregated fractional melting. EM2 is classically interpreted as mantle material enriched in trace elements through the ancient, subduction-zone recycling of terrigenous sediments; here we show this model is unlikely and provide two other working hypotheses. The first is recycling of melt-impregnated oceanic lithosphere; the second is recycling of a mantle wedge impregnated with melt from a subducting oceanic plate.Very generous financial support for this thesis has been provided by WHO17s Academic Programs Office, NSF grants 8 1903800,80489100 and 82591700 to Stan Hart and the Cole Ocean Ventures Fund

Viscous Shock Layer Method to Predict Communication Blackout during Re-entry Phase

Communication blackout generally occurs during the re-entry at high velocities through the atmosphere. Air ahead of the re-entry vehicle dissociates and then ionises, leading to the production of electrons. These electrons may reflect or attenuate the communication signals. Electron densities with plasma frequency exceeding the communication frequency lead to blackout. Electron density is a function of the body shape, velocity and altitude. The viscous shock layer method is used to predict the electron density, and thereby the plasma frequency for various configurations. This method is successfully implemented for analytic and non-analytic geometry configurations available in the literature. The electron densities computed for the RAM-C configuration agree well with the flight results. The onset of blackout during the re-entry phase is also predicted reasonably well by this method. The method performs well at high altitudes, where nonequilibrium conditions prevail.Defence Science Journal, 2011, 61(4), pp.364-369, DOI:http://dx.doi.org/10.14429/dsj.61.108

A refined sub-grid model for black hole accretion and AGN feedback in large cosmological simulations

In large scale cosmological hydrodynamic simulations simplified sub-grid models for gas accretion onto black holes and AGN feedback are commonly used. Such models typically depend on various free parameters, which are not well constrained. We present a new advanced model containing a more detailed description of AGN feedback, where those parameters reflect the results of recent observations. The model takes the dependency of these parameters on the black hole properties into account and describes a continuous transition between the feedback processes acting in the so-called radio-mode and quasar-mode. In addition, we implement a more detailed description of the accretion of gas onto black holes by distinguishing between hot and cold gas accretion. Our new implementations prevent black holes from gaining too much mass, particularly at low redshifts so that our simulations are now very successful in reproducing the observed present-day black hole mass function. Our new model also suppresses star formation in massive galaxies slightly more efficiently than many state-of-the-art models. Therefore, the simulations that include our new implementations produce a more realistic population of quiescent and star-forming galaxies compared to recent observations, even if some discrepancies remain. In addition, the baryon conversion efficiencies in our simulation are - except for the high mass end - consistent with observations presented in literature over the mass range resolved by our simulations. Finally, we discuss the significant impact of the feedback model on the low-luminous end of the AGN luminosity function.Comment: 25 pages, 19 figures. MNRAS accepted. Magneticum website: http://www.magneticum.or

Report of the Library Study Committee on the Mack Library: Lighting the Way for the Next Generation

The 2014 Library Study Committee report outlines the committee\u27s vision for a future library at Bridgewater College that can serve its core mission serving as a centerpiece for the academic community for the next generation. The committee developed its report based on its research and analysis of the existing building, its operation, current library space use and floor plan, campus program analysis and needs, the college\u27s relation to peer institutions, review of library construction projects including the University of Denver\u27s Anderson Academic Commons, the James Madison University\u27s Rose Library, Goucher College\u27s Athenaeum and Library, University of Mary Washington\u27s Information Technology Convergence Center, and Library University\u27s Jerry Falwell Library

Relationship between Sexual Fantasy, Sexual Communication, Personality Traits and Sexual Satisfaction in Married Individuals

The study aimed to understand the relationship between sexual fantasy, sexual communication, personality traits and sexual satisfaction in married individuals. Sexual fantasy as a variable has seldom been studied in the Indian context. The importance of sexual fantasies has been noted by therapists and researchers. Studying various aspects of sexual functioning in married life including, sexual communication and sexual satisfaction and personality traits would be beneficial. A cross sectional design with a total sample of 100 married individuals was considered. Tools were administered as online forms. Parametric and Non-parametric tests were used to find the correlation between Sexual fantasy and sexual satisfaction, sexual communication and sexual satisfaction and personality traits and sexual satisfaction. Results indicated that sexual fantasy and sexual satisfaction have a negative correlation, sexual communication and sexual satisfaction have a positive correlation and personality traits and sexual satisfaction also have a positive correlation. This study can be used to develop modules that might aid in marital and sex therapy. It may be useful in identifying any difficulties or issues which may help in providing appropriate timely interventio

Origin and properties of dual and offset active galactic nuclei in a cosmological simulation at z=2

In the last few years, it became possible to observationally resolve galaxies with two distinct nuclei in their centre. For separations smaller than 10kpc, dual and offset active galactic nuclei (AGN) are distinguished: in dual AGN, both nuclei are active, whereas in offset AGN only one nucleus is active. To study the origin of such AGN pairs, we employ a cosmological, hydrodynamic simulation with a large volume of (182Mpc)^3 from the set of Magneticum Pathfinder Simulations. The simulation self-consistently produces 35 resolved black hole (BH) pairs at redshift z=2, with a comoving distance smaller than 10kpc. 14 of them are offset AGN and nine are dual AGN, resulting in a fraction of (1.2 \pm 0.3)% AGN pairs with respect to the total number of AGN. In this paper, we discuss fundamental differences between the BH and galaxy properties of dual AGN, offset AGN and inactive BH pairs and investigate their different triggering mechanisms. We find that in dual AGN the BHs have similar masses and the corresponding BH from the less massive progenitor galaxy always accretes with a higher Eddington ratio. In contrast, in offset AGN the active BH is typically more massive than its non-active counterpart. Furthermore, dual AGN in general accrete more gas from the intergalactic medium than offset AGN and non-active BH pairs. This highlights that merger events, particularly minor mergers, do not necessarily lead to strong gas inflows and thus, do not always drive strong nuclear activity.Comment: 17 pages, 18 figures, accepted for publication in MNRAS, website: http://www.magneticum.or

Ready or Not 2022: Protecting the Publics Health from Diseases, Disasters and Bioterrorism

This report measures states' degree of preparedness to respond to a wide spectrum of health emergencies and to provide ongoing public health services, including disease surveillance, seasonal flu vaccination, safe water, and expanded healthcare services during emergencies. It includes policy recommendations for strengthening the nation's health security

Geochemical characerization of endmember mantle components

Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2005.Includes bibliographical references.This thesis uses trace elements and radiogenic isotope tracers to define elemental abundances in reservoirs of the Earth's mantle, including EM2 (the Enriched Mantle 2), as seen in the Samoan hotspot track, and DMM (the depleted upper mantle), which is sampled at mid-ocean ridges. Together these components comprise up to [approx.] 50% of the total mantle mass. Much of the mantle's chemical heterogeneities are suspected to originate by either the removal of mass from the mantle (in the case of DMM) or the addition of mass to the mantle through subduction zones (in the case of EM2). We show that DMM represents mantle that 1) has been previously depleted by 2-3% melt removal, 2) mass-balances well with the continental crust, 3) has only 15% of the radiogenic heat production in primitive upper mantle and 4) can generate present-day ocean crust by 6% aggregated fractional melting. EM2 is classically interpreted as mantle material enriched in trace elements through the ancient, subduction-zone recycling of terrigenous sediments; here we show this model is unlikely and provide two other working hypotheses.(cont.) The first is recycling of melt- impregnated oceanic lithosphere; the second is recycling of a mantle wedge impregnated with melt from a subducting oceanic plate.by Rhea K. Workman.Ph.D