Method of adhering bone to a rigid substrate using a graphite fiber reinforced bone cement

A method is described for adhering bone to the surface of a rigid substrate such as a metal or resin prosthesis using an improved surgical bone cement. The bone cement has mechanical properties more nearly matched to those of animal bone and thermal curing characteristics which result in less traumatization of body tissues and comprises a dispersion of short high modulus graphite fibers within a bonder composition including polymer dissolved in reactive monomer such as polymethylmethacrylate dissolved in methylmethacrylate monomer

Polymers for spacecraft hardware - Materials characterization, part I Interim report, Mar. - Dec. 1966

Environmental testing of polymeric materials for spacecraft hardwar

Inconsistencies in the MIT bag model of hadrons

It is shown that what is commonly referred to as the MIT `bag' model of hadrons is thermodynamically wrong: The adiabatic conditions between pressure and temperature, and between pressure and volume imply the third, an adiabatic relation between temperature and volume. Consequently, the bag model is destitute of any predictive power since it reduces to a single adiabatic state. The virial theorems proposed by the MIT group are shown to be the result of the normal power density of states of a non-degenerate gas and not the exponential density of states of the Hagedorn mass spectrum. A number of other elementary misconceptions and inaccuracies are also pointed out.Comment: 9 page

Analysis of deployable strut roof structures

Thesis (M. Eng.)--Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2013.Cataloged from PDF version of thesis. "June 2013."Includes bibliographical references (pages 55-56).Deployable structures are structures that can change shape from a compact to an expanded form. Thus, their advantage over conventional structures is adaptability, whether in the sense of adapting to changing environmental conditions or being adapted for repeated transportation and deployment. These features make deployable structure highly desirable for a wide range of applications in the aerospace, military, and architectural fields. However, these structures are often only designed as small scale "products", rather than structures requiring full analysis and design procedures. Much work has focused on the various geometries of the deployment mechanisms without considering practical engineering aspects. If deployable structures are to be designed on the scale of large civil structures, a proper understanding of the flow of forces through the structure is required. This thesis begins with a brief discussion of deployable structures in general before moving on to geometric constraints of strut-type deployable structures. Then, it details a preliminary analysis of one class of deployable structures, known as angulated element structures. These structures are designed to be operable roofs spanning over sports facilities. During deployment, the center of the structure opens or closes to accommodate changes in weather conditions. Building on the geometry established in other work, the relationships between the basic geometric parameters of angulated element rings and their structural characteristics are determined. SAP2000 analysis results are used to make specific design recommendations. The feasibility of using this type of structure for an operable long span roof is confirmed.by Maxwell H. Wolfe.M.Eng

An exploration of social inclusion in Australian community sport : the case of Muslim women

University of Technology, Sydney. Faculty of Business.This thesis examines processes of social inclusion in Australian community sport settings. In particular, it explores the social inclusion dimensions as related to one community group, Muslim women. The research considers how organisational policies, practices, programs and projects can facilitate or inhibit the social inclusion of Muslim women. Various elements of organisational inclusion were explored through a case study approach which involved three different community sport settings. The facilitation of social inclusion was examined through document analysis, individual and focus group interviews. There has been much written about social inclusion and social capital in sport. For the purposes of the thesis research a theoretical approach derived from Bailey’s (2008) social inclusion framework informed the methodology, including the data collection and data analysis. Four dimensions of social inclusion comprising ‘spatial’, ‘relational’, ‘functional’ and ‘power’, along with the associated two staged model, were used as a lens through which to view the case studies. Each case was individually constructed and analysed, within its organisational and community context, and the discussion section highlights the similarities and differences between the cases in relation to social inclusion facilitation. The research findings indicate that organisational practices and policies can both facilitate and inhibit social inclusion, and that there are associated complex, multifaceted interactions which produce individually constructed participation and inclusion outcomes. Successful practices identified in the case studies were those that engaged Islamic families through cultural intermediaries and supported Islamic practices. The way in which the dimensions of social inclusion interact is elaborated on in the discussion section of the thesis. The thesis empirically assessed the theoretical model and comments on its strengths and shortcomings in relation to this particular context. The case studies provide an insight into the interconnected nature of the social inclusion dimensions and formed the basis for the development of a modified social inclusion framework. This reworked framework provides a conceptual basis from which to analyse processes involved in the social inclusion of specifically identified groups in community sport settings. Furthermore, the research highlights the complexities associated with social inclusion and its close nexus with social exclusion. The latter can marginalise individuals that have different cultural or other practices, expectations or requirements from those of individuals from mainstream communities. Nevertheless, the research provides evidence of the effectiveness of social inclusion initiatives in community sport, and demonstrates that proactive policies, culturally appropriate practices and well-designed programs can lead to the increased participation of Muslim women. The thesis findings contribute to the body of knowledge around social inclusion by providing a unique insight into the dynamics of social inclusion/exclusion

Information erasure without an energy cost

Landauer argued that the process of erasing the information stored in a memory device incurs an energy cost in the form of a minimum amount of mechanical work. We find, however, that this energy cost can be reduced to zero by paying a cost in angular momentum or any other conserved quantity. Erasing the memory of Maxwell's demon in this way implies that work can be extracted from a single thermal reservoir at a cost of angular momentum and an increase in total entropy. The implications of this for the second law of thermodynamics are assessed.Comment: 8 pages with 1 figure. Final published versio

Native American College Students: A Population That Can No Longer Be Ignored

Native Americans have the highest college drop out rate of any ethnic minority (Reddy, 1993). This paper addresses the unique challenges that Native American college students face, including suppressing familial and spiritual beliefs, having financial disadvantages, coping with existing stereotypes, receiving insufficient secondary education, and finding no one on campus with whom to identify. According to Brown and Robinson Kurpius (1997), “A common element of successful Native American drop out prevention programs is that at least one adult establishes a relationship of trust with each youth” (p. 5). In the spirit of the above-mentioned quote, this paper also addresses the importance of the involvement of student affairs offices in establishing connections with Native American students, which contributes to an improved college experience and increased retention of native students. Specifically, the counseling center, career services, and the ALANA (African, Latino/a, Asian, and Native American) student center are discussed

Advances in semantic representation for multiscale biosimulation: a case study in merging models

As a case-study of biosimulation model integration, we describe our experiences applying the SemSim methodology to integrate independently-developed, multiscale models of cardiac circulation. In particular, we have integrated the CircAdapt model (written by T. Arts for MATLAB) of an adapting vascular segment with a cardiovascular system model (written by M. Neal for JSim). We report on three results from the model integration experience. First, models should be explicit about simulations that occur on different time scales. Second, data structures and naming conventions used to represent model variables may not translate across simulation languages. Finally, identifying the dependencies among model variables is a non-trivial task. We claim that these challenges will appear whenever researchers attempt to integrate models from others, especially when those models are written in a procedural style (using MATLAB, Fortran, etc.) rather than a declarative format (as supported by languages like SBML, CellML or JSim’s MML)