A Portable, Low-Cost Wheelchair Ergometer Design Based on a Mathematical Model of Pediatric Wheelchair Dynamics

Evaluation and training of wheelchair propulsion improves efficiency and prevents orthopaedic injury in pediatric manual wheelchair users. Ergometers allow static propulsion and emulate typical conditions. Currently available ergometers have deficiencies that limit their use in motion analysis. A new ergometer is developed and evaluated based on a model of wheelchair inertial dynamics that eliminates these deficiencies. This makes integrated motion analysis of wheelchair propulsion in current community, home, and international outreach efforts possible

Conflict in Outdoor Recreation

The causes of conflict among users of outdoor recreation resources have received little attention from recreation researchers. Knowledge of factors responsible for conflict might assist recreation planners\u27 attempts to reduce future instances of conflict and help management focus its conflict resolution efforts. A theory of conflict is offered as the first step in systematically procuring such knowledge. A definition and characteristics of outdoor recreation conflicts are presented; four comprehensive causes of user conflicts are proposed. Ten propositions are used to link these factors to conflict and suggest future research hypotheses. The social psychological dynamics of conflict, as described here, have implications for understanding the sources of user dissatisfaction. In part two, 120 interviews, taken from two conflict situations involving mechanized and nonmechanized forms of recreation, were used to examine the heuristic value of the theory\u27s concepts. A case study format was used for the analysis. The interviews demonstrated a need to distinguish between potential and felt, or experienced, conflict, due to the latter\u27s dependence on a chance social interaction. Nonmechanized users displayed a high conflict potential, indicated by conflict avoidance behavior, which reduced reports of felt conflict. Fewer mechanized users expressed felt conflict. Stereotyping of the opposite group\u27s lifestyle was found in both cases, as was a lack of intergroup communication. A negative evaluation of the other group\u27s lifestyle seems inherent in such stereotypes. Opposing groups sought different outcomes from interacting with a natural environment though backcountry vehicle users showed a more diverse set of interactions than the literature or stereotypes suggest. Users demonstrated possessiveness for a particular recreation place--this orientation may also exist for categories of places such as National Parks. The findings support the contention that differences in lifestyle, modes of experiencing natural environments, and resource specificity are factors responsible for conflict and worthy of future research

Evaluation of Upper Extremity Movement Characteristics during Standardized Pediatric Functional Assessment with a Kinect®-based Markerless Motion Analysis System

A recently developed and evaluated upper extremity (UE) markerless motion analysis system based on the Microsoft® Kinect® has potential for improving functional assessment of patients with hemiplegic cerebral palsy. 12 typically-developing adolescents ages 12-17 were evaluated using both the Kinect-based system and the Shriners Hospitals for Children Upper Extremity Evaluation (SHUEE), a validated measure of UE motion. The study established population means of UE kinematic parameters for each activity. Statistical correlation analysis was used to identify key kinematic metrics used to develop automatic scoring algorithms. The Kinect motion analysis platform is technically sound and can be applied to standardized task-based UE evaluation while providing enhanced sensitivity in clinical analysis and automation through scoring algorithms

Time and Energy, Exploring Trajectory Options Between Nodes in Earth-Moon Space

The Global Exploration Roadmap (GER) was released by the International Space Exploration Coordination Group (ISECG) in September of 2011. It describes mission scenarios that begin with the International Space Station and utilize it to demonstrate necessary technologies and capabilities prior to deployment of systems into Earth-Moon space. Deployment of these systems is an intermediate step in preparation for more complex deep space missions to near-Earth asteroids and eventually Mars. In one of the scenarios described in the GER, "Asteroid Next", there are activities that occur in Earth-Moon space at one of the Earth-Moon Lagrange (libration) points. In this regard, the authors examine the possible role of an intermediate staging point in an effort to illuminate potential trajectory options for conducting missions in Earth-Moon space of increasing duration, ultimately leading to deep space missions. This paper will describe several options for transits between Low Earth Orbit (LEO) and the libration points, transits between libration points, and transits between the libration points and interplanetary trajectories. The solution space provided will be constrained by selected orbital mechanics design techniques and physical characteristics of hardware to be used in both crewed missions and uncrewed missions. The relationships between time and energy required to transfer hardware between these locations will provide a better understanding of the potential trade-offs mission planners could consider in the development of capabilities, individual missions, and mission series in the context of the ISECG GER

Measuring the Impacts of Agricultural Input Subsidies in Sub-Saharan Africa: Evidence from Malawi\u27s Farm Input Subsidy Program

Malawi, a small, land-locked country in south Eastern Africa has been at the forefront of the recent push to reestablish subsidies as a way of boosting agricultural production and improving food security, especially among the poor. Its programs have been widely observed, scrutinized, and emulated. This policy brief examines Malawi’s Farm Input Subsidy Program (FISP) and distills a set of key research findings drawn from research conducted recently at Purdue University

Charge Symmetry Breaking Effects on Neutron Beta Decay in Non-Relativistic Quark Models

A formalism for the study of charge symmetry breaking (CSB) effects is discussed and used to analyze the effects of charge symmetry breaking on neutron beta decay. The effect of including CSB reduces the beta decay matrix element by an amount on the order of $10^{-4}$, a value much larger than the previous estimate. A much smaller contribution due to proton recoil is treated as well, which is found to be on the order of $10^{-6}$. The current uncertainty in the value of $V_{ud}$ is also of order $10^{-4}$. An improvement of that uncertainty by an order of magnitude would require that charge symmetry breaking effects should be included in future analyses.Comment: 8 pages, submitted to add citatio

Superoperator Analysis of Entanglement in a Four-Qubit Cluster State

In this paper we utilize superoperator formalism to explore the entanglement evolution of four-qubit cluster states in a number of decohering environments. A four-qubit cluster state is a resource for the performance of an arbitrary single logical qubit rotation via measurement based cluster state quantum computation. We are specifically interested in the relationship between entanglement evolution and the fidelity with which the arbitrary single logical qubit rotation can be implemented in the presence of decoherence as this will have important experimental ramifications. We also note the exhibition of entanglement sudden death (ESD) and ask how severely its onset affects the utilization of the cluster state as a means of implementing an arbitrary single logical qubit rotation.Comment: 9 pages, 9 composite figures, presentation of results completely rewritte

Amorphous Computing

The goal of amorphous computing is to identify organizationalprinciples and create programming technologies for obtainingintentional, pre-specified behavior from the cooperation of myriadunreliable parts that are arranged in unknown, irregular, andtime-varying ways. The heightened relevance of amorphous computingtoday stems from the emergence of new technologies that could serve assubstrates for information processing systems of immense power atunprecedentedly low cost, if only we could master the challenge ofprogramming them. This document is a review of amorphous computing

The Role of Personality In Moving Encounters with Sacred Art

In Roman Catholic and Eastern Orthodox traditions, the material world is understood to contain access points to the transcendent. An icon may move the awestruck believer to emotional engagement and reflection on moral and religious themes. Personality dispositions potentiating the experience of being moved in religious aesthetic contexts have not been thoroughly studied. The present article describes the development and testing of a cross-sectional study into potential belief and personality-related predictors of being moved by sacred art in a lab environment evocative of a holy site. Ninety (90) Christians in Canada and Greece completed personality measures and viewed and rated thematically matched Latin and Byzantine icons. Findings suggest impacts of attachment, imaginativeness, and traditional vs. mystical dispositions in resonance with sacred art, and point to a secure, mystically oriented perceiver. Those who tended towards structured religious lives also presented with a personality profile favouring logical problem-solving. The paradigm applied the social psychological tradition of an evocative lab situation and use of psychometric tests to pressing questions in aesthetics and transpersonal psychology. This study offers a replicable methodology, inviting further empirical inquiry into the experiential texture of being moved and predictive relationships among individual differences at play in moving encounters