Comment: Corporate Governance: Directors vs. Shareholders

TesisTrujilloEscuela de PosgradoGestión y Calidad EducativaEl presente trabajo de investigación tiene como objetivo determinar el efecto de la estrategia IDEAR en la resolución de problemas de regularidad, equivalencia y cambio en los niños del V ciclo de la Institución Educativas N°64137, del Centro Poblado Santa Rosa de Masisea, distrito de Masisea, Departamento Ucayali, 2018 La investigación es de tipo explicativo el diseño es pre experimental con preprueba/ posprueba con un solo grupo, en una muestra de 19 estudiantes a la que se le aplicó la estrategia IDEAR. Para recoger los datos se utilizó una lista de cotejo. Los datos fueron procesados a través del programa SPSS V.24. Los resultados generales, el 100% de los niños se encontraban en el nivel preinicio, luego de la intervención solo el 36,8%, estaban en este nivel, el 26,3% subió al nivel inicio, el 21,1% califico en el nivel en proceso y el 15,8% calificó en el nivel previo, y el estadístico de prueba de rangos de signo de Wilcoxon arrojó un p-valor de 0,002 menor que el nivel de significancia; demostrando que la estrategia IDEAR, afecta significativamente en la resolución de problemas de regularidad, equivalencia y cambio

Double window viewing chamber assembly

A viewing chamber which permits observation of a sample retained therein includes a pair of double window assemblies mounted in opposed openings in the walls thereof so that a light beam can directly enter and exit from the chamber. A flexible mounting arrangement for the outer windows of the window assemblies enables the windows to be brought into proper alignment. An electrical heating arrangement prevents fogging of the outer windows whereas desiccated air in the volume between the outer and inner windows prevents fogging of the latter

Tradition and rural modernity in Mary Webb’s Shropshire: Precious Bane in context

In Precious Bane (1924), Mary Webb explores the potential of traditional ways of seeing to enable the renaturing of landscapes depleted and increasingly denatured by normalized exploitative capitalist farming practices. Webb does not unquestioningly celebrate tradition, as is apparent from the ambivalent representation of Beguildy, or the cruelty of Huglet and Grimble. Nevertheless, the novel challenges the post-Enlightenment hierarchical opposition between a supposedly rational modernity, and the allegedly ignorant superstition of those whose lives are still structured around traditional ways of understanding the world. This distinction has often been central to the promotion of what Karl Bell calls the "mythification of the modern." Bell has in mind the uncritical assumption that all things modern are a source of progress, especially when, as is often the case, the modern is understood to mean a world dominated and structured by instrumentalism and laissez-faire capitalism. In Precious Bane, the provisional and "mythopoeic" qualities of both traditional beliefs and practices and different versions of rural modernity are explored through the fraught relationships between Prue Sarn, the first-person narrator; her atheist brother Gideon (who rejects tradition, and fully embraces modern laissez-faire capitalism); and the cunning-man Beguildy (who exemplifies tradition)

Deep images of cluster radio halos

New radio data are presented for the clusters A401, A545, A754, A1914, A2219 and A2390, where the presence of diffuse radio emission was suggested from the images of the NRAO VLA Sky Survey. Sensitive images of these clusters, obtained with the Very Large Array (VLA)at 20 cm confirm the existence of the diffuse sources and allow us to derive their fluxes and intrinsic parameters.The correlation between the halo radio power and cluster X-ray luminosity is derived for a large sample of halo clusters, and is briefly discussed.Comment: 9 pages, 13 figures, Astron. Astrophys. in pres

The Development and Use of A Piloted Flight Simulation Environment for Rotary-Wing Operation to the Queen Elizabeth Class Aircraft Carriers

Flight simulation is being used to inform the First of Class Flight Trials for the UK’s new Queen Elizabeth Class (QEC) aircraft carriers. The carriers will operate with the Lockheed Martin F-35B Lightning II fighter aircraft, i.e. the Advanced Short Take-Off and Vertical Landing variant of the F-35. The rotary wing assets that are expected to operate with QEC include Merlin, Wildcat, Chinook and Apache helicopters. An F-35B flight simulator has been developed and is operated by BAE Systems at Warton Aerodrome. The University of Liverpool is supporting this project by using Computational Fluid Dynamics (CFD) to provide the unsteady air flow field that is required in a realistic flight simulation environment. This paper is concerned with a research project that is being conducted using the University’s research simulator, HELIFLIGHT-R, to create a simulation environment for helicopter operations to the QEC. The paper briefly describes how CFD has been used to model the unsteady airflow over the 280m long aircraft carrier and how this is used to create a realistic flight simulation environment. Results are presented from an initial simulation trial in which test pilots have used the HELIFLIGHT-R simulator to conduct simulated helicopter landings to two landing spots on the carrier, one in a disturbed air flow and the other in clean air. As expected, the landing to the spot in disturbed air flow requires a greater pilot workload, shows greater deviation in its positional accuracy and requires more control activity. This initial trial is the first of a planned series of simulated helicopter deck landings for different wind angles and magnitudes

A Virtual Engineering Approach to the Ship-Helicopter Dynamic Interface; a decade of modelling and simulation research at The University of Liverpool

This paper reviews some of the research that has been carried out at the University of Liverpool where the Flight Science and Technology Research Group has developed its Heliflight-R full-motion research simulator to create a simulation environment for the launch and recovery of maritime helicopters to ships. HELIFLIGHT-R has been used to conduct flight trials to produce simulated Ship-Helicopter Operating Limits (SHOLs). This virtual engineering approach has led to a much greater understanding of how the dynamic interface between the ship and the helicopter contributes to the pilot's workload and the aircraft's handling qualities and will inform the conduct of future real-world SHOL trials. The paper also describes how modelling and simulation has been applied to the design of a ship's superstructure to improve the aerodynamic flow field in which the helicopter has to operate. The superstructure aerodynamics also affects the placement of the ship's anemometers and the dispersion of the ship's hot exhaust gases, both of which affect the operational envelope of the helicopter, and both of which can be investigated through simulation

Using piloted simulation to measure pilot workload of landing a helicopter on a small ship

When conducting landings to a ship's deck in strong winds, helicopter pilot workload is often dominated by the turbulence within the ship's airwake. Previous studies have shown that larger ships create more aggressive airwakes and simulated flight trials had shown that it can be easier to land to a smaller ship than a large one. However, there are helicopter-enabled ships that are less than 100m in length and these will have significantly greater ship motion in rough seas than a large ship. The study reported in this paper has used a motion-base flight simulator to evaluate the pilot workload when landing to three geometrically similar ships of lengths 100m, 150m and 200m. Ship motion software has been used to create realistic deck displacements for sea states 4, 5 and 6, which are consistent with the increasing wind speed over the deck. It has been shown that the 100m ship was the most difficult to land to, with deck motion being the limiting factor. The next most difficult ship to land to was the 200m ship, with airwake turbulence being the limiting factor. The 150m ship generated the lowest pilot workload. The study has demonstrated that when ship motion is excessive, as it will be with small ships in rough seas, pilot workload will be dominated by deck motion during a landing task, but as the ship gets larger and more stable, airwake disturbances will dominate. It is clear from this study that realistic ship motion is essential when using piloted flight simulation to conduct simulated ship-helicopter operations

The Queen Elizabeth Class Aircraft Carriers: Airwake Modelling and Validation for ASTOVL Flight Simulation

This paper outlines progress towards the development of a high-fidelity piloted flight simulation environment for the UK’s Queen Elizabeth Class (QEC) aircraft carriers which are currently under construction. It is intended that flight simulation will be used to de-risk the clearance of the F-35B Lightning-II to the ship, helping to identify potential wind-speeds/directions requiring high pilot workload or control margin limitations prior to First of Class Flight Trials. Simulated helicopter launch & recovery trials are also planned for the future. The paper details the work that has been undertaken at the University of Liverpool to support this activity, and which draws upon Liverpool’s considerable research experience into simulated launch and recovery of maritime helicopters to single-spot combat ships. Predicting the unsteady air flow over and around the QEC is essential for the simulation environment; the very large and complex flow field has been modelled using Computational Fluid Dynamics (CFD) and will be incorporated into the flight simulators at the University of Liverpool and BAE Systems Warton for use in future piloted simulation trials. The challenges faced when developing airwake models for such a large ship are presented together with details of the experimental setup being prepared to validate the CFD predictions. Finally, the paper describes experimental results produced to date for CFD validation purposes and looks ahead to the piloted simulation trials of aircraft launch and recovery operations to the carrier