Strings in gravity with torsion

A theory of gravitation in 4D is presented with strings used in the material action in $U_4$ spacetime. It is shown that the string naturally gives rise to torsion. It is also shown that the equation of motion a string follows from the Bianchi identity, gives the identical result as the Noether conservation laws, and follows a geodesic only in the lowest order approximation. In addition, the conservation laws show that strings naturally have spin, which arises not from their motion but from their one dimensional structure.Comment: 16 page

Electrical characterization of a Mapham inverter using pulse testing techniques

Electric power requirements for aerospace missions have reached megawatt power levels. Within the next few decades, it is anticipated that a manned lunar base, interplanetary travel, and surface exploration of the Martian surface will become reality. Several research and development projects aimed at demonstrating megawatt power level converters for space applications are currently underway at the NASA Lewis Research Center. Innovative testing techniques will be required to evaluate the components and converters, when developed, at their rated power in the absence of costly power sources, loads, and cooling systems. Facilities capable of testing these components and systems at full power are available, but their use may be cost prohibitive. The use of a multiple pulse testing technique is proposed to determine the electrical characteristics of large megawatt level power systems. Characterization of a Mapham inverter is made using the proposed technique and conclusions are drawn concerning its suitability as an experimental tool to evaluate megawatt level power systems

The Relationship between Positive Beliefs about Post-Event Processing and Social Phobia Symptoms

Meta-cognitive models have been utilized to explore the relations between worry and generalized anxiety disorder, as well as, the associations between rumination and depression. However, relatively few studies have focused on the role of meta-cognitive variables and social phobia symptoms. It is possible that individuals with social phobia follow a pattern of thinking similar to that of those who experience depressive rumination and worry. Specifically, it may be that individuals with social phobia hold positive beliefs about their highly negative prolonged post-event evaluations of social interactions. The primary goal of this study was the development and assessment of the Positive Beliefs about Post-Event Processing Questionnaire (PB-PEPQ). Further, it was predicted that post-event processing would mediate the relationship between positive beliefs about post-event processing and social phobia symptoms. The findings from this study suggested that the PB-PEPQ is a valid and reliable construct. Additionally, the findings provide initial evidence for a cognitive model in which individuals who tend to hold positive beliefs about post-event processing, tend to engage in post-event processing which may increase social phobia symptoms

Assessing the Experiences of Women who have Suffered Intimate Partner Violence Living in Shelters

According to the Centers for Disease Control on National Intimate Partner and Sexual Violence in 2010, more than 1 in 3 women (35.6%) and more than 1 in 4 men (28.5%) in the United States have experienced rape, physical violence, and/or stalking by an intimate partner in their lifetime. Throughout history, someone they knew has most often victimized women. Over the past thirty years, feminist organizers of the domestic violence (DV) movement powered public awareness regarding the prevalence of intimate partner violence (IPV) dominantly. This led to the development of a network of shelters and other support services for victims, and altered the criminal justice system’s response to survivors (Goodman & Epstein, 2008). Homelessness in the lives of intimate partner victims cannot be underestimated as violence in the homes of women is one of the factors leading to their homelessness (Bassuk, Buckner, Weinreb, Browne, Bassuk, Dawson & Perlojf, 1997). This study presents a qualitative study of the subjective experiences of women who have survived intimate partner violence and are staying at shelters. In-depth, semi-structured interviews were conducted with four survivors. The interviews highlighted the forms of support the women received as shelter residents, and their perceptions on improvement strategies to make their stay in shelters more successful. Findings portrayed that women appreciated the assistance they received to meet their physical, emotional, spiritual and psychological needs. However, residents emphasized emotional and physical needs as paramount in the forms of support they received. Suggestions to make shelter stay of residents more successful included encouraging support groups for survivors and children, as well as a reduction in restrictions that governed shared spaces of shelter residents. KEYWORDS: Intimate partner violence, women, survivors, shelters, subjective experience

The valuation tool user guide: monetizing Cradle to Cradle®

This User Guide outlines the object, scope and expected deliverables from the Valuation Tool component of the Cradle to Cradle ® C2C BIZZ project. It describes the compendium of subtools that have been developed comprising: i) overview of funding tools; ii) C2C investment appraisal tool; and iii) C2C value indexing tool. The underpinning methodologies, as well as their inherent strengths and limitations are also described. The C2C BIZZ project as a whole aims specifically to promote and enhance the implementation of C2C methods in business site development within North Western Europe (NWE) (PAD, p.14). It is intended to infuse C2C notions into conventional site development, restructuring and management. The primary focus of the project is on planning, building and managing of business sites with C2C credentials (PAD, p.18) using sites in Lille Metropole (La Lainiere), London (London Sustainable Industries Park) and Luxemburg (Ecoparc Windhof) as experimental fields. C2C BIZZ is not concerned with the internal operations and activities of occupiers or users of the developed site. Accordingly, the scope of the valuation tool is confined to the planning, building and management of C2C sites. The deliverable from this component is a compendium of subtools (see Figure 1 below) that may be used to analyse the financial performance of C2C credentials in business sites to aid the making of a business case for such developments and evaluating the financial incentives for particular C2C site development projects. This entire work is premised on the argument that the wider adoption of C2C principles within the built environment depends on the rate of uptake by the private sector. The private sector, being profit driven, are likely to engage in C2C site development if they are convinced of its capacity to contribute to their business goals which ultimately is a return on their investment. The tool development described in this document attempts to provide a framework for collating an evidence base that can assist in articulating the business case for C2C in business site developments

Effect of delayed acquisition times on Gadolinium-enhanced MRI of the presumably normal canine brain

A delay in imaging following intravenous contrast medium administration has been recommended to reduce misdiagnoses. However, the normal variation of contrast enhancement in dogs following a delay has not been characterized. Contrast enhanced MR imaging of 22 dogs was assessed, in terms of identification of normal anatomic structures, to investigate the variation associated with 10 minute delay between contrast medium administration and imaging. All dogs had a normal brain MR imaging study and unremarkable CSF. Specific ROIs were assessed both objectively, using computer software, and subjectively using three observers. Mean contrast enhancement greater than 10% was seen in the pituitary gland, choroid plexus, meninges, temporal muscle, trigeminal nerve and the trigeminal nerve root. Structures with an active blood-brain-barrier had minimal contrast enhancement (<6%). Enhancing structures had significantly more contrast enhancement at t=1min versus t=10min, except in temporal muscle, the trigeminal nerve and the trigeminal nerve root. Inter-observer agreement was moderate to good in favor of the initial post contrast T1w sequence. The observers found either no difference or poor agreement in identification of the non-vascular structures. Intra-observer agreement was very good with all vascular structures and most non-vascular structures. A degree of meningeal enhancement was a consistent finding. The initial acquisition had higher enhancement characteristics and observer agreement for some structures; however, contrast-to-noise was comparable in the delayed phase or not significantly different. We provide baseline references and suggest that the initial T1w post contrast sequence is preferable but not essential should a delayed post contrast T1w sequence be performed

A student's guide to United States patent applications

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.Includes bibliographical references (p. 39).This thesis presents a comprehensive guide to patent applications in the United States derived from the information provided by the United States Patent and Trademark Office (USPTO). This guide gives indepth instructions for completing and suggestions for filing a provisional, utility, design, or plant patent with the USPTO. Several statistical analyses were done on patent applications and grants in the United States over the last two decades. In addition, a case study is completed on an invention patented in the United States and the company that resulted from it. The case study provides an example of how the patent system creates the opportunity for continued economic progress. As new technologies are discovered, inventors will continue to patent their ideas and increase the scope for commerce.by Jennifer N. Hammond.S.B