Application of digital control to a magnetic model suspension and balance model

The feasibility of using a digital computer for performing the automatic control functions for a magnetic suspension and balance system (MSBS) for use with wind tunnel models was investigated. Modeling was done using both a prototype MSBS and a one dimensional magnetic balance. A microcomputer using the Intel 8080 microprocessor is described and results are given using this microprocessor to control the one dimensional balance. Hybrid simulations for one degree of freedom of the MSBS were also performed and are reported. It is concluded that use of a digital computer to control the MSBS is eminently feasible and should extend both the accuracy and utility of the system

Integration and Conventional Systems at STAR

At the beginning of the design and construction of the STAR Detector, the collaboration assigned a team of physicists and engineers the responsibility of coordinating the construction of the detector. This group managed the general space assignments for each sub-system and coordinated the assembly and planning for the detector. Furthermore, as this group was the only STAR group with the responsibility of looking at the system as a whole, the collaboration assigned it several tasks that spanned the different sub-detectors. These items included grounding, rack layout, cable distribution, electrical, power and water, and safety systems. This paper describes these systems and their performance.Comment: 17 pages, 6 figures, Contribution to a NIM Volume Dedicated to the Detectors and the Accelerator at RHI

Development of closed loop roll control for magnetic balance systems

This research was undertaken with the goal of demonstrating closed loop control of the roll degree of freedom on the NASA prototype magnetic suspension and balance system at the MIT Aerophysics Laboratory, thus, showing feasibility for a roll control system for any large magnetic balance system which might be built in the future. During the research under this grant, study was directed toward the several areas of torque generation, position sensing, model construction and control system design. These effects were then integrated to produce successful closed loop operation of the analogue roll control system. This experience indicated the desirability of microprocessor control for the angular degrees of freedom

Commentary on the United Kingdom evidence report about the effectiveness of manual therapies

This is an accompanying commentary on the article by Gert Bronfort and colleagues about the effectiveness of manual therapy. The two commentaries were provided independently and combined into this single article by the journal editors

Education Reform for the Digital Era

Will the digital-learning movement repeat the mistakes of the charter-school movement? How much more successful might today's charter universe look if yesterday's proponents had focused on the policies and practices needed to ensure its quality, freedom, and resources over the long term? What mistakes might have been avoided? Damaging scandals forestalled? Missed opportunities seized

Research and development of high-performance light-weight fuel cell electrodes final report, nov. 1, 1963 - oct. 31, 1964

High performance light weight fuel cell electrode developmen

How can we assess the burden of muscle, bone and joint conditions in rural Botswana:context and methods for the MuBoJo focused ethnography

BACKGROUND: Musculoskeletal diseases are the most common causes of long-term pain and disability worldwide and a growing international public health concern. However, the everyday burden and impact of musculoskeletal conditions are not well understood, especially among people living in low- and middle-income countries in Africa. Since 2011, World Spine Care, a nongovernmental organisation, has collaborated with the Botswana Ministry of Health to open spine care centres and to conduct research. The broad aim of the Muscle, Bone and Joint (MuBoJo) research project is to examine the sociocultural, organisational and clinical characteristics for the burden of living with and caring for people living with musculoskeletal conditions in rural Botswana. In this paper, we describe the community context, theoretical framework, and research methods to address the project aim with a qualitative study. METHODS/DESIGN: This focused ethnography is based on eight months (November 2011, April 2013, October 2013-March 2014) of fieldwork in Botswana. The project was theoretically informed by the concepts of explanatory models of illness, social suffering, and biographical disruption. Data collection included fieldnotes, non-participant and participant observations, and informal and in-depth interviews with villagers and healthcare providers. Villager interviews were typically conducted in Setswana with an interpreter. Audio recordings were transcribed verbatim in the language spoken with Setswana contextually translated into English. Computer software supported qualitative data management. Analysis is ongoing using constant comparison and a template organising style to facilitate pattern-finding and reveal insights for the burden and care of musculoskeletal conditions. DISCUSSION: Findings from the MuBoJo Project will document the context of musculoskeletal burden, illness beliefs, self-care behaviours, and healthcare options in a Botswana rural village. These data will inform ongoing efforts to establish spine care clinics for underserved populations in low-middle income countries and sustain these healthcare services through local providers and volunteer health professionals. This study also will generate new knowledge about the burden and impact of muscle, bone and joint disorders for cross-cultural comparisons and patient-centred interventions. CONCLUSIONS: Our systematic and transparent methodology to conduct musculoskeletal research in more than one language and in a cross-cultural setting may be useful for investigators and NGO healthcare personnel. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s12998-015-0056-9) contains supplementary material, which is available to authorized users

Application of superconducting coils to the NASA prototype magnetic balance

Application of superconducting coils to a general purpose magnetic balance was studied. The most suitable currently available superconducting cable for coils appears to be a bundle of many fine wires which are transposed and are mechanically confined. Sample coils were tested at central fields up to .5 Tesla, slewing rates up to 53 Tesla/ sec and frequencies up to 30 Hz. The ac losses were measured from helium boil-off and were approximately 20% higher than those calculated. Losses were dominated by hysteresis and a model for loss calculation which appears suitable for design purposes is presented along with computer listings. Combinations of two coils were also tested and interaction losses are reported. Two feasible geometries are also presented for prototype magnetic balance using superconductors

1934 Haldeman High School Yearbook

The 1934 Haldeman High School Yearbook from Haldeman, Kentucky.https://scholarworks.moreheadstate.edu/rowan_count_yearbooks/1019/thumbnail.jp

Excitable Scale Free Networks

When a simple excitable system is continuously stimulated by a Poissonian external source, the response function (mean activity versus stimulus rate) generally shows a linear saturating shape. This is experimentally verified in some classes of sensory neurons, which accordingly present a small dynamic range (defined as the interval of stimulus intensity which can be appropriately coded by the mean activity of the excitable element), usually about one or two decades only. The brain, on the other hand, can handle a significantly broader range of stimulus intensity, and a collective phenomenon involving the interaction among excitable neurons has been suggested to account for the enhancement of the dynamic range. Since the role of the pattern of such interactions is still unclear, here we investigate the performance of a scale-free (SF) network topology in this dynamic range problem. Specifically, we study the transfer function of disordered SF networks of excitable Greenberg-Hastings cellular automata. We observe that the dynamic range is maximum when the coupling among the elements is critical, corroborating a general reasoning recently proposed. Although the maximum dynamic range yielded by general SF networks is slightly worse than that of random networks, for special SF networks which lack loops the enhancement of the dynamic range can be dramatic, reaching nearly five decades. In order to understand the role of loops on the transfer function we propose a simple model in which the density of loops in the network can be gradually increased, and show that this is accompanied by a gradual decrease of dynamic range.Comment: 6 pages, 4 figure