Kin and non-kin relationships of a selected group of urban families.

Thesis (M.S.)--Boston Universit

Spectroscopic characterization of graphene films grown on Pt (111) surface by chemical vapor deposition of ethylene

This work reports the peculiar properties of a graphene film prepared by the chemical vapor deposition (CVD) of ethylene in high vacuum on a well oriented and carefully cleaned Pt(111) crystal surface maintained at high temperature. In-situ and ex-situ characterization techniques (low energy electron diffraction, high resolution electron energy loss spectroscopy, scanning electron microscopy and Raman micro-spectroscopy) used here indicate the prevalence of single layer regions and the presence of two different orientations of the graphene sheets with respect to the Pt(111) substrate. In most of the deposited area evidence is found of a compressive stress for the graphene lattice, as a net result of the growth process on a metal substrate. This graphene film grown on Pt(111) exhibits a lower degree of order and of homogeneity with respect to the exfoliated graphene on Si/SiO2, as it is found generally for graphene on metals, but several characterization techniques indicates a better quality than in previous deposition experiments on the same metal substrate.Comment: 18 pages, 5 figures, Journal of Raman spectroscopy 201

Step-edge-induced resistance anisotropy in quasi-free-standing bilayer chemical vapor deposition graphene on SiC

Cataloged from PDF version of article.The transport properties of quasi-free-standing (QFS) bilayer graphene on SiC depend on a range of scattering mechanisms. Most of them are isotropic in nature. However, the SiC substrate morphology marked by a distinctive pattern of the terraces gives rise to an anisotropy in graphene's sheet resistance, which may be considered an additional scattering mechanism. At a technological level, the growth-preceding in situ etching of the SiC surface promotes step bunching which results in macro steps similar to 10 nm in height. In this report, we study the qualitative and quantitative effects of SiC steps edges on the resistance of epitaxial graphene grown by chemical vapor deposition. We experimentally determine the value of step edge resistivity in hydrogen-intercalated QFS-bilayer graphene to be similar to 190 Omega mu m for step height h(S) = 10 nm and provide proof that it cannot originate from mechanical deformation of graphene but is likely to arise from lowered carrier concentration in the step area. Our results are confronted with the previously reported values of the step edge resistivity in monolayer graphene over SiC atomic steps. In our analysis, we focus on large-scale, statistical properties to foster the scalable technology of industrial graphene for electronics and sensor applications. (C) 2014 AIP Publishing LLC

Numerical simulations of the heat flow in a concrete rod

This paper discusses the results of numerical simulations of unsteady heat flow in a concrete rod. The temperature distributions obtained are compared with experimental results. The main goal of this paper is to find soil thermal parameters values for concrete which leads to obtaining the best correlation between the measured and calculated temperatures

Obesity in the Military: the Role of Leadership in Creating Partnerships for Effective Change within the Canadian Forces Community

Excess weight is associated with a range of adverse health outcomes, from diseases like diabetes and coronary heart disease to a diminished quality of life and increased risk of overall mortality. Obesity is a modifiable risk factor caused primarily by poor diet and inadequate physical activity, and supported by a societal environment that encourages both. Within the Canadian Forces (CF) the majority of members are now classified as either overweight or obese, with the rate of obesity rising to almost a quarter of military members. In a military context obesity is also negatively associated with operational readiness. The CF has an existing long-term strategic vision to promote a culture of health and fitness, and the Strengthening the Forces (STF) program is integral in that vision. Qualitative research engaged staff of the CF Directorate of Force Health Protection (D FHP) through rolling interviews, in which data was collected on existing obesity-related health promotion programs and perceived barriers and challenges to success in lowering obesity rates. Interviews started with the core staff of the STF program and expanded to other programs that touch on obesity, including food services, fitness, and clinical services. In conjunction with a literature search on the role of leaders in successful partnerships, the qualitative research helped to answer the question of what defines an effective leader within a partnership setting, what the perceived organizational barriers to implementation of obesity interventions and the creation of a culture of health and fitness within the CF were, and whether these barriers can be overcome through effective leadership in a collaborative partnership.Master of Public Healt

Failure modes of gabion retaining walls

The results of numerical simulations of the destruction of gabion retaining walls are presented. Special attention is paid to distinguishing possible destruction modes

GOTHIC SPACE ACCORDING TO HANS JANTZEN AND THE DEVELOPMENT OF STAINED GLASS WINDOWS

[EN] A change took place in stained glass window design in the late thirteenth century. The role of stained glass windows evolved between the twelfth century and late thirteenth century, from one of retaining light, as an integral part of a wall, to one of transmitting light, in the form of an architectural opening. However, this shift was relatively unappreciated in the context of cathedral spaces, given that it was overshadowed by the other architectural transformations that were taking place at the time. The aim of this work is to study this change in concept, taking the cathedral of León, Spain, as an example[ES] A finales del siglo XIII se produjo un cambio en la concepción de los vitrales. De las vidrieras del siglo XII entendidas como retenedoras de luz, es decir cómo superficie mural, se evolucionó a las vidrieras de finales del XIII, entendidas como trasmisoras de luz, es decir como huecos arquitectónicos. Pero este cambio apenas sí se aprecia en el espacio de las catedrales, ya que es atenuado por otras transformaciones de índole arquitectónico. En este artículo vamos a estudiarlo tomando como ejemplo la Catedral de León.Vallespin Muniesa, A.; Agustín Hernández, L.; Cervero Sánchez, N. (2015). El espacio gótico según Hans Jantzen y la evolución de las vidrieras. EGA. Revista de Expresión Gráfica Arquitectónica. 20(25):238-247. doi:10.4995/ega.2015.3671SWORD2382472025Gage, John, 2001 (1993), Color y Cultura. Madrid. Siruela.Grodecki, Louis, 1975. La Sainte-Chapelle. Paris. Caisse Nationale des Monuments Historiques et des Sites.Jantzen, Hans, 1959 (1957). La arquitectura Gótica. Buenos aires. Nueva Visión.Panofsky, Erwin, 2007 (1948). La arquitectura gótica y la escolástica. Madrid. Siruela.Pseudo-Dionisio, 2007 (2002). Obras completas. Madrid. BAC.Seldmayr, Hans, 2011 (1960). La luz en sus manifestaciones artísticas. Madrid. Lampreave