Redundancy of hydraulic flight control actuators

The constraint of requiring airplanes to have inherent aerodynamic stability can be removed by using active control systems. The resulting airplane requires control system reliability approaching that of the basic airframe. Redundant control actuators can be used to achieve the required reliability, but create mechanization and operational problems. Of numerous candidate systems, two different approaches to solving the problems associated with redundant actuators which appear the most likely to be used in advanced airplane control systems are described

A Method for siting and prioritizing the removal of derelict vessels in Florida Coastal Waters: test applications in the Florida Keys

Increased boating activities and new waterfront developments have contributed an estimated 3,000 dismantled, abandoned, junked, wrecked, derelict vessels to Florida coastal waters. This report outlines a method of siting and prioritizing derelict vessel removal using the Florida Keys as a test area. The data base was information on 240 vessels, obtained from Florida Marine Patrol files. Vessel location was plotted on 1:250,000 regional and 1:5,000 and 1:12,000 site maps. Type of vessel, length, hull material, engine, fuel tanks, overall condition, afloat and submerged characteristics, and accessibility, were used to derive parametric site indices of removal priority and removal difficulty. Results indicate 59 top priority cases which should be the focus of immediate clean up efforts in the Florida Keys. Half of these cases are rated low to moderate in removal difficulty; the remainder are difficult to remove. Removal difficulty is a surrogate for removal cost: low difficulty -low cost, high difficulty - high cost. The rating scheme offers coastal planners options of focusing removal operations either on (1) specific areas with clusters of high priority derelict vessels or on (2) selected targeted derelicts at various, specific locations. (PDF has 59 pages.

Using audio feedback with distance learning students to enhance their learning on a Postgraduate Certificate in Higher Education programme

Our aim is to investigate the use of audio feedback for formative assessment on a Postgraduate Certificate Higher Education in Teaching and Supporting Learning (PG Cert HE) programme. The case study draws on the experience of the participants who undertook this programme at a distance, as well as the reflections of the teaching team. Our study aims to address some of these issues and provide educators with an account of how audio feedback might be successfully integrated into distance learning programmes

Visual Communication in Fashion and Textile Design

The "technological revolution" has presented educators with a range of new tools that, alongside traditional teaching methods, can be employed in the communication of visual ideas to fashion and textile design students. Although the drive to harness the economy, power, speed, and global reach of computer communications is understandable, it is important that the differing technologies available are assessed objectively for what they can offer in terms of education, and are used to optimise the teaching and learning process, rather than being seized and used as "technology for technology's sake". This paper explores the range of communication tools available to educators, evaluates their effectiveness in communicating visual ideas to fashion and textile design students, and seeks to explore why a backlash in the use of ICT is currently being experienced in fashion and textile design pedagogy. To facilitate this evaluation, a range of visual communication tools will be drawn upon, including the author’s own illustration work which is currently being used in collaboration with the cultural anthropologist Ted Polhemus to illustrate how ideas about fashion branding can be communicated in a more immediate and potent way than via the written word

The Use of Technology in Adult Art and Design Education

The ‘technological revolution’ of recent years has yielded a range of new tools and materials that can be used to assist teaching and learning in adult art and design education. It has been widely presumed that these tools would promote the practice of students‘ ‘self-directed learning’, thus saving money for financially overstretched Universities, and helping educators to cope with the stresses of increased student numbers, and the demands of widening participation. Research shows that this is not always the case, however. By drawing upon the experience of a number of educators in several UK Universities and Colleges, this paper seeks to evaluate how effective are computer-related tools in teaching and learning art and design, how efficiently they are currently being used to enhance art and design education in Britain, and why a backlash in the use of ICT is currently being experienced in some UK art and design education establishments

Brief History of the Corporations Now or Formerly Controlled by Bangor Railway and Electric Company

A letter written January 24, 1924, by E.C. (Erastus) Ryder, lawyer at Ryder & Simpson, 6 State Street, Bangor, Maine, to Edward M. Graham, President of Bangor Railway and Electric Company. Cites the Private and Special Laws of the Maine State Legislature which incorporated and authorized activities of companies controlled by Bangor Railway and Electric Company. Includes information about the Bangor Railway & Electric Company; Bangor Electric Light and Power Company; Bangor Railway and Electric Company; Penobscot Water and Power Company; Brewer Water Company; Bangor, Orono, and Old Town Railway Company; Bangor, Hampden, and Winterport Railway Company; Bangor and Northern Railroad Company; Bar Harbor and Union River Power Company; Ellsworth Electric Illuminating Company; Bar Harbor Electric Light Company; Bodwell Water Power Company; and Lincoln Light and Power Company,https://digicom.bpl.lib.me.us/bangorhydro_news/1064/thumbnail.jp

World Style File: Design Research and Education on a Global Scale

'Style File' is a unique educational project that proposes to unite design students from around the world in an international collaborative design project, using the Internet and other electronic means of communication. It is an example of how the Internet can be used to provide students with a valuable learning experience on a global scale. The concept for “Style File” was initiated early in 2006 by Ted Polhemus – well-known “Style Commentator”, anthropologist, author, journalist and photographer. Polhemus is a widely-used consultant on youth marketing and style trends and is the author of several books on the anthropology of personal style and image. Many of these books are standard texts for design students and students of cultural studies. The author of this paper has been asked by Polhemus to monitor the progress of the students involved in the project at Liverpool John Moores University, UK, a founding participant in the project, and to provide illustrations for the book and web site that arise from the project. These illustrations will also form part of the International touring exhibition that is planned to coincide with the publication of the book in each participating country

Transport coefficients of a mesoscopic fluid dynamics model

We investigate the properties of stochastic rotation dynamics (Malevanets-Kapral method), a mesoscopic model used for simulating fluctuating hydrodynamics. Analytical results are given for the transport coefficients. We discuss the most efficient way of measuring the transport properties and obtain excellent agreement between the theoretical and numerical calculations.Comment: 12 pages, 9 figures, submitted to J. Chem. Phy

Gauge invariance and non-constant gauge couplings

It is shown that space-time dependent gauge couplings do not completely break gauge invariance. We demonstrate this in various gauge theories.Comment: 18 page

A CONTINOUS ROTARY ACTUATION MECHANISM FOR A POWERED HIP EXOSKELETON

This thesis presents a new mechanical design for an exoskeleton actuator to power the sagittal plane motion in the human hip. The device uses a DC motor to drive a Scotch yoke mechanism and series elasticity to take advantage of the cyclic nature of human gait and to reduce the maximum power and control requirements of the exoskeleton. The Scotch yoke actuator creates a position-dependent transmission that varies between 4:1 and infinity, with the peak transmission ratio aligned to the peak torque periods of the human gait cycle. Simulation results show that both the peak and average motor torque can be reduced using this mechanism, potentially allowing a less powerful motor to be used. Furthermore, the motor never needs to reverse direction even when the hip joint does. Preliminary testing shows the exoskeleton can provide an assistive torque and is capable of accurate position tracking at speeds covering the range of human walking. This thesis provides a detailed analysis of how the dynamic nature of human walking can be leveraged, how the hip actuator was designed, and shows how the exoskeleton performed during preliminary human trials