Solution of the Angles-Only Satellite Tracking Problem

A single observation station, located at an arbitrary point on the surface of the Earth, can determine only the azimuth and elevation angles of a satellite or ballistic vehicle, and the time at which these observations occur. No information is available about the range or the range-rate of the target. It is shown that five observations of either the elevation or the azimuth, and the time of either set of observations, determine the complete set of orbital elements of the target. The implementation of the theory presented here could provide a great reduction in the hardware costs associated with satellite and reentry vehicle tracking

Good Quality and Safe Home Canned Food.

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Noninvasive electrocardiogram imaging of substrate and intramural ventricular tachycardia in infarcted hearts

AbstractObjectivesThe goal of this study was to experimentally evaluate a novel noninvasive electrocardiographic imaging modality during intramural reentrant ventricular tachycardia (VT).BackgroundMyocardial infarction and subsequent remodeling produce abnormal electrophysiologic substrates capable of initiating and maintaining reentrant arrhythmias. Existing noninvasive electrocardiographic methods cannot characterize abnormal electrophysiologic substrates in the heart or the details of associated arrhythmias. A noninvasive method with such capabilities is needed to identify patients at risk of arrhythmias and to guide and evaluate therapy.MethodsA dog heart with a four-day-old infarction was suspended in a human shaped torso-tank. Measured body surface potentials were used to noninvasively compute epicardial potentials, electrograms and isochrones. Accuracy of reconstruction was evaluated by direct comparison to measured data. Reconstructions were performed during right atrial pacing and nine cycles of VT.ResultsNoninvasively reconstructed potential maps, electrograms and isochrones identified: 1) the location of electrophysiologically abnormal infarct substrate; 2) the epicardial activation sequences during the VTs; 3) the locations of epicardial breakthrough sites; and 4) electrophysiologic evidence for activation of the Purkinje system and septum during the reentrant beats.ConclusionsElectrocardiographic imaging can noninvasively reconstruct electrophysiologic information on the epicardium during VT with intramural reentry, provide information about the location of the intramural components of reentry and image abnormal electrophysiologic substrates associated with infarction

Indirect costs of adult pneumococcal disease and the productivity-based rate of return to the 13-valent pneumococcal conjugate vaccine for adults in Turkey

Productivity benefits of health technologies are ignored in typical economic evaluations from a health payer’s perspective, risking undervaluation. We conduct a productivity-based cost-benefit analysis from a societal perspective and estimate indirect costs of adult pneumococcal disease, vaccination benefits from the adult 13-valent pneumococcal conjugate vaccine (PCV13 Adult), and rates of return to PCV13 Adult for a range of hypothetical vaccination costs. Our context is Turkey’s funding PCV13 for the elderly and for non-elderly adults with select comorbidities within the Ministry of Health’s National Immunization Program. We use a Markov model with one-year cycles. Indirect costs from death or disability equal the expected present discounted value of lifetime losses in the infected individual’s paid and unpaid work and in caregivers’ paid work. Vaccination benefits comprise averted indirect costs. Rates of return equal vaccination benefits divided by vaccination costs, minus one. Input parameters are from public data sources. We model comorbidities’ effects by scalar multiplication of the parameters of the general population. Indirect costs per treatment episode of inpatient community-acquired pneumonia (CAP), bacteremia, and meningitis - but not for outpatient CAP - approach or exceed Turkish per capita gross domestic product. Vaccination benefits equal $207.02 per vaccination in 2017 US dollars. The rate of return is positive for all hypothetical costs below this. Results are sensitive to herd effects from pediatric vaccination and vaccine efficacy rates. For a wide range of hypothetical vaccination costs, the rate of return compares favorably with those of other global development interventions with well-established strong investment cases

Introducing Change in Public Service Organizations under Austerity: The Complex Case of the Governance of the Defence in the United Kingdom

Introducing, managing, and sustaining change in public service organizations is challenging for policy makers to implement and for scholars to theorize. In 2010, the U.K. Government introduced policy changes to help bring down the national deficit. The executive's planned reforms aimed to deliver a so‐called battle‐winning military force, a smaller and more professional Ministry of Defence, and an affordable overall defence organization. The article borrows from theories of management and public policy to help enlighten our understanding of change under New Public Management and governance approaches. The article's central claim is that the U.K. Government sought to correct cost‐efficiency processes in public service organizations trying to reshape organizational and managerial structures dependent on many internal and external pressures. The article examines the executive's purpose in developing a need for change and the ways to implement it. I question whether the U.K. Government's prescriptive and hierarchical approach to organizational change in public administration is sustainable in the long term

Help-Seeking Behavior in Victims of Elder Abuse: A Systematic Review

Elder abuse has become increasingly relevant for intervention and study in the context of an aging population. One of the major barriers to progress in the field is underreporting of elder abuse by victims. This systematic literature review aimed to synthesize the available findings regarding victims’ help-seeking behavior to inform practice, understand the limits of the evidence, and identify research gaps. A comprehensive search of published and unpublished literature was undertaken, and studies were included if they addressed help-seeking behavior from the perspective of elder abuse victims aged 60 and older. A total of 19 studies met inclusion criteria for review. Findings are presented as a narrative synthesis organized according to help-seeking barriers, facilitators, sources of help, the responses of others, and the characteristics of victims more likely to seek help. Although barriers and sources of help received detailed attention across all studies, findings regarding victim characteristics and facilitators for and responses to help-seeking were limited. The results suggest that there are many barriers to help-seeking and that some victims only seek help when the abuse is perceived as unbearable or they fear for their safety. Results are discussed in relation to implications for intervention, including suggestions to enhance help-seeking behavior. Future research should identify facilitators of help-seeking among victims of elder abuse and victim characteristics associated with early disclosure. Research efforts should frame help-seeking as a continuing process and study ways in which the responses of others may impact future help-seeking or service engagement

Sustaining entrepreneurial business: a complexity perspective on processes that produce emergent practice

This article examines the management practices in an entrepreneurial small firm which sustain the business. Using a longitudinal qualitative case study, four general processes are identified (experimentation, reflexivity, organising and sensing), that together provide a mechanism to sustain the enterprise. The analysis draws on concepts from entrepreneurship and complexity science. We suggest that an entrepreneur’s awareness of the role of these parallel processes will facilitate their approaches to sustaining and developing enterprises. We also suggest that these processes operate in parallel at multiple levels, including the self, the business and inter-firm networks. This finding contributes to a general theory of entrepreneurship. A number of areas for further research are discussed arising from this result

Changing practice: the possibilities and limits for reshaping social work practice

Since 2010 the United Kingdom has witnessed a number of initiatives that shift away from reliance on performance management to improve social work with children and families, towards a renewed interest in practice models. This study reports on the evaluation of a local government programme in England to introduce and embed systemic family practice through the roll out of intensive training to social workers and frontline managers. It was anticipated through the programme that child protection social workers would undertake more direct work with families and build more positive relationships, resulting in a fall in the number of child protection plans and children experiencing repeat periods of care. The evaluation adopted a mixed method approach encompassing an online survey of social workers, interviews with team managers and family members, a case audit and statistical analysis of local level metrics. It found limited employment of systemic family practice or improvement due to the programme. Adopting the 7 S framework, this study examines the barriers to and facilitators of successful change and identifies generic considerations for change programmes in child protection social work