Synthesis of improved feeds for large circular paraboloids

Synthesis of low-noise feeds for large circular paraboloids using hybrid modes propagated in cylindrical waveguides - antenna field pattern

Understanding the personality traits of street-gang involved individuals

This thesis contributes to the literature base regarding the psychology of street-gang membership by exploring the personality traits of street-gang members, with a specific focus on resilience. Academics have suggested that street-gang membership is the result of an integration between individual and environmental factors and recommend that research is conducted to explore these areas. Considering the negative impact of street-gang related violence, this area of research is crucial for individual street-gang members, the practitioners that work with them, and the wider community. The first chapter provides an introduction to the thesis by outlining the rationale for this research and exploring some of the definitional difficulties in relation to two key constructs: street-gang membership and resilience. A commentary on the current need for this research, alongside historical background and the theoretical underpinnings of gang membership is provided. Subsequently, focus is given to the construct of resilience. Chapter 2 presents the first systematic literature review conducted to explore the personality traits of male street-gang members. The review concludes by highlighting several personality traits that appear to be linked to street-gang membership including overall psychopathy, emotional traits (such as aggression), traits relating to autonomy, traits relating to identity, anti-social personality difficulties and resilience. The third chapter of this thesis provides a critical evaluation of a resilience measurement tool, the Connor-Davidson Resilience Scale (CD-RISC; Connor & Davidson, 2003). Findings in relation to reliability and validity of the measure are promising. However, it is noted that there is currently no gold standard measurement tool of resilience, and the critique concludes that a more specific measure of resilience would be helpful for research and practice. Chapter 4 presents an empirical research study investigating differences in scores on the Resilient Systems Scale (Maltby et al., 2017) between street-gang and non-street-gang involved individuals in custody in the U.K. No significant differences in scores on the sub-scales were found between street-gang and non-street-gang involved individuals. However, descriptive statistics offer some interesting results that may benefit from further exploration. The conclusion of this chapter highlighted the need to further explore the construct of resilience in order to ascertain whether this trait is associated with street-gang membership and/or leaving a street-gang. The thesis conclusions presented in Chapter 5 consider the main findings in relation to previous literature, comment on the strengths and limitations of the thesis as a whole, discuss the implications for forensic practice, and make recommendations for future research

Wind assisted ship propulsion: Exploring technologies, wing sail assessment procedure and VLGC case study

A literature review of Wind Assisted Ship Propulsion methods is presented, along with an assessment procedure for wing sails and its thorough application in a case study. The assessment procedure conducted utilizes XFOIL to obtain a lift coefficient and drag coefficient, MARIN’s Blue Route application is used for obtaining wind data, finally MATLAB is utilized for calculations. The assessment procedure calculations focus on power, energy, fuel tonnage required, fuel tonnage saved, fuel volume required, and finical analysis including money saved, Net Present Value, and Simple Payback Period. These calculations are completed for a variety of fuels including combustion of High Sulphur Fuel Oil, Very Low Sulphur Fuel Oil, Liquified Natural Gas, Liquid Hydrogen, and Liquid Ammonia. In addition, the use of fuel cells is considered for Liquid Hydrogen, and Liquid Ammonia. The assessment procedure is deemed successful, the percent savings from the sail array mirrors that from literature very closely. The fuel savings results show 19% at 10 knots, 8% at 16 knots and 2% at 20 knots for the round trip from Hamburg, Germany to Walvis Bay, Namibia. During the literature review wing sails showed an average fuel oil consumption savings of 10%. More specifically up to 22% savings were observed at low speeds. On a more comparable journey from Cape Lopez, Gabon to Point Tucker Canada fuel oil consumption was reduced to 8.8% which is in line with 8.0% estimated during the case study on the round trip from Hamburg to Walvis Bay

Profiles of Ocean surface Heating (POSH): A New Model of Upper Ocean Diurnal Warming

Shipboard radiometric measurements of diurnal warming at the ocean surface and profiles through the diurnal thermocline were utilized to assess the temporal and vertical variability and to develop a new physics-based model of near-surface warming. The measurements and modeled diurnal warming were compared, with the goal of comprehensively evaluating differences between the data and model results. On the basis of these results, the diurnal model was refined while attempting to maintain agreement with the measurements. Simplified bulk models commonly do not provide information on the vertical structure within the warm layer, but this new model predicts the vertical temperature profile within the diurnal thermocline using an empirically derived function dependent on wind speed. The vertical profile of temperature provides both a straightforward methodology for modeling differences due to diurnal warming between measurements made at different depths (e.g., in situ measurements at various depths and measurements of the surface temperatures by satellite radiometers) and information on upper ocean thermal structure. Additionally, the model estimates of diurnal warming at the ocean surface are important for air-sea heat and gas flux calculations, blending satellite sea surface temperature fields, and air-sea interaction studies. Copyright 2009 by the American Geophysical Union

"She must not stir out of a darkened room": The Redpath Mansion Mystery

This paper accounts for private life in a prominent Gilded-Age Montreal bourgeois household as revealed in the sudden glare of publicity generated by a violent double shooting. We show how the tragic deaths of a mother and her son re-enforced fragile class connections between propriety and wealth, family relations and family image. Drawing on diaries, photographs and newspaper accounts, as well as published novels and poetry, we argue that the family deployed architecture, both the spaces of its own home and public monumental architecture in the city, to follow the dictates of a paradoxical imperative: intimacy had to be openly displayed, family private matters enacted in public rituals. The surviving family quickly began a series of manoeuvers designed to make secret the public event, and re-inscribe the deaths within class norms of decorum and conduct. The house itself, we claim, as a material object, figures in the complex interplay of inter-connected social relationships, behaviours and narratives that produce bourgeois respectability. Résumé Cet article relate la vie privée dans une éminente maison bourgeoise de l’âge d’or de Montréal, telle qu’elle s’est révélée sous l’éclairage brutal de la publicité occasionnée par une violente fusillade. Nous y montrons comment les morts tragiques d’une mère et de son fils ont renforcé de fragiles connexions de classe entre la propriété et la richesse, les relations familiales et l’image de la famille. En se basant sur des journaux intimes, des photographies et des articles de journaux, ainsi que sur des romans et des poésies publiés, nous avançons l’idée que la famille exposait l’architecture, autant les espaces de son propre foyer que l’architecture monumentale publique de la ville, pour se plier aux diktats d’un impératif paradoxal : l’intimité devait être ouvertement montrée, les problèmes familiaux privés joués dans des rituels publics. Les survivants de la famille ont rapidement entamé une série de manœuvres pour réduire au secret l’évènement public et pour réinscrire les personnes décédées au sein de normes de classe, de décorum et de conduite. Nous avançons que la maison elle-même, en tant qu’objet matériel, est présente dans le jeu complexe des relations sociales interconnectées, des comportements et des récits qui produisent la respectabilité bourgeoise

Help A Sista Out: Black Women Doctoral Students’ Use of Peer Mentorship as an Act of Resistance

Many Black women doctoral students entering and persisting through graduate study lack the affirmation, community, and resources necessary to confidently assert themselves as members of the academy. These barriers make it especially difficult for Black women to effectively navigate doctoral programs that privilege and normalize elite white male experiences. Using Black feminism as the conceptual lens, this manuscript presents a burgeoning peer mentorship framework of Black women doctoral students attending a predominantly white institution through a collective Black feminist autoethnography. This model highlights our strategy for not only surviving the academy, but also resisting manifestations of white heteropatriarchal violence within academia. In contrast to more common and formal faculty-student mentorship models, we engage an emergent, horizontal peer mentorship framework, comprised of three tenets: radical coping, communal sista scholarship, and the cultivation of an authentic holistic self

Near-surface ocean temperature

Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 111 (2006): C02004, doi:10.1029/2004JC002689.The first open ocean deployment of the Skin Depth Experimental Profiler (SkinDeEP) was from the R/V Melville in the Gulf of California during the Marine Optical Characterization Experiment (MOCE–5). SkinDeEP is an autonomous, vertical profiler for the upper few meters of the ocean. During MOCE–5, SkinDeEP was deployed on 10 separate occasions, and profiles were made at intervals of approximately one minute each. A total of 976 profiles were acquired during the cruise. The ocean skin temperatures were measured by the Marine Atmosphere Emitted Radiance Interferometer (M–AERI), an infrared spectroradiometer. Typical meteorological conditions were of low winds and high insolation. The dataset provided captures the near-surface temperature structure that decouples the skin layer from the conventional in–situ bulk sea surface temperature measurements made at a depth of a few meters. Data from SkinDeEP showed strong diurnal warming within the upper few meters, with one extreme case of 4.6 K. There were large discrepancies when computing the skin–bulk temperature difference with bulk temperatures at different depths. Results also show the strong dependency of estimating air–sea heat flux based on SST, with warm–layer errors of almost 60 Wm-2 associated with intense stratification. This indicates the importance of the inclusion of the skin temperature for accurate calculation of latent, sensible, and net longwave heat fluxes.The development of SkinDeEP was funded through the Research Council of Norway (Prosjektnr. 127872/720). Support was provided by the European Commission under the Marie Curie Fellowship contract ERBFMBICT983162. Further supportwas provided by NSF grant OCE–0241834 and National Oceanographic Partnership Program Award No. NNG04GM56G