Experimentally determined flutter from two- and three-bladed model bearingless rotors in hover

A series of experiments was performed on a 1.8-m-diam model rotor in hover for the principal purpose of investigating the lead-lag stability of isolated bearingless rotors. Incidental to those tests, at least three types of pitch-flap flutter were encountered. Type 1 flutter occurred approximately at the second flap-mode frequency on both two-and three-bladed rotors for both small and large pitch angles and appeared to be a classic pitch-flap flutter. Type 2 flutter showed mostly torsional motion and was seen on both two- and three-bladed rotors. Type 3 flutter was a regressing flap flutter that occurred for only the three-bladed rotor configurations and appears to be a wake excited flutter. Although flutter occurred on a number of different configurations, no rotor parameters were identified that were clearly stabilizing or destabilizing

Test results of JPL LiSOCl sub 2 cells

In the development of high rate Li-SO-Cl2 cells for various applications, the goal is to achieve 300 watt-hours per kilogram at the C/2 (5 amp) rate in a D cell configuration. The JPL role is to develop the understanding of the performance, life, and safety limiting characteristics in the cell and to transfer the technology to a manufacturer to produce a safe, high quality product in a reproducible manner. The approach taken to achieve the goals is divided into four subject areas: cathode processes and characteristics; chemical reactions and safety; cell design and assembly; and performance and abuse testing. The progress made in each of these areas is discussed

Atmospheric modelling for NOMAD-UVIS on board the ExoMars Trace Gas Orbiter mission

The Ultraviolet and Visible Spectrometer (UVIS) instrument development process requires the construction of an atmospheric model to provide synthetic UV transmission spectra. We discuss the requirements of the model to enable observational limits to be found, and the potential for certain atmospheric parameters to be further constrained

Traditional Markets under threat: why it’s happening and what traders and customers can do

Traditional markets in the UK find themselves at a crossroads; on one hand pushed out by changing retail trends and urban redevelopment, on the other championed as desirable, vibrant spaces which are the key to reviving town centres. Regeneration plans threaten what many traders and customers see as a unique and necessary public space in the heart of our towns and cities. This report has two aims; 1) To critically examine the changing fortunes of the traditional market, with an emphasis on wider urban regeneration and gentrification strategies 2) To explore ways in which customers and traders can successfully maintain markets as places which serve particular and often marginalised groups of people, and in which the social value of these spaces is maintained. The report is aimed at campaigners or potential campaigners, people with a general or academic interest in regeneration, retail and urban development, and policy-makers (especially at a local level). It draws on campaign work and the analysis of campaign groups such as ‘Friends of’ market groups in Birmingham, Leeds, Peterborough and Queen’s Market (East London), as well as trader groups like Shepherd’s Bush Market Traders Association and grassroots housing activists like Tower Hamlets Renters

Resisting retail gentrification in traditional public markets in London

This paper uncovers the mobilisation and resistance of citizens in the UK against retail gentrification. It focuses on existing and past campaigns that have emerged to save, promote and sustain traditional retail markets in particular in London. By traditional markets we refer to covered and uncovered licensed markets which sell all kinds of produce and services. In this paper we look at traditional retail markets not merely as spaces for consumption but as spaces for socialising, identity building and also for contestation and resistance. The aims of the paper are: 1. To explain how and why traditional markets are under threat 2. To critically analyse processes of gentrification in traditional retail markets 3. To discuss existing campaigns and resistance practices against the gentrification of traditional retail markets in London. The paper is based on research conducted thanks to a scholar-activist award by the Antipode Foundation in 2015. We used a mixed methodology of desk-based research to provide a picture of the state of markets in the UK and uncover existing and past market campaigns. We identified 10 past and present campaigns across the UK and in this paper we focus on 3 campaigns in London. We find that although campaigns not always use the language if gentrification as discussed by academics, the markets as mobilised as spaces for political discussion about the city and urban justice

Multi-KW dc distribution system technology research study

The Multi-KW DC Distribution System Technology Research Study is the third phase of the NASA/MSFC study program. The purpose of this contract was to complete the design of the integrated technology test facility, provide test planning, support test operations and evaluate test results. The subjet of this study is a continuation of this contract. The purpose of this continuation is to study and analyze high voltage system safety, to determine optimum voltage levels versus power, to identify power distribution system components which require development for higher voltage systems and finally to determine what modifications must be made to the Power Distribution System Simulator (PDSS) to demonstrate 300 Vdc distribution capability

Deriving modified rankin scores from medical records

<p><b>Background and Purpose:</b> Modified Rankin score (mRS) is traditionally graded using a face-to-face or telephone interview. Certain stroke assessment scales can be derived from a review of a patient’s case-record alone. We hypothesized that mRS could be successfully derived from the narrative within patient case-records.</p> <p><b>Methods:</b> Sequential patients attending our cerebrovascular outpatient clinic were included. Two independent, blinded clinicians, trained in mRS, assessed case-records to derive mRS. They scored “certainty” of their grading on a 5-point Likert scale. Agreement between derived and traditional face-to-face mRS was calculated using attribute agreement analysis.</p> <p><b>Results:</b> Fifty patients with a range of disabilities were included. Case-record appraisers were poor at deriving mRS (k=0.34 against standard). Derived mRS grades showed poor agreement between observers (k=0.33). There was no relationship between certainty of derived mRS and proportion of correct grades (P=0.727).</p> <p><b>Conclusion:</b> Accurate mRS cannot be derived from standard hospital records. Direct mRS interview is still required for clinical trials.</p&gt