Construcción de mesas

Segunda unidad del bloque modular “Construcción de muebles” de la serie “Ebanistería” en la que se describe cómo fabricar una mesa junto a los procesos de selección correcta de la madera, determinación de las medidas y empleo de los ensambles apropiados.Second unit of the "Furniture Construction" modular block of the "Cabinet Making" series, which describes how to make a table together with the processes of selecting the correct wood, determining the measurements and using the appropriate assemblies.Partes constitutivas de una mesa -- Modelos de mesas -- Estructuras de una mesa- Medidas estándar de las mesas de comedor -- Medidas de las piezas que componen una mesa de comedor -- Selección de madera -- Prueba de control -- Proceso para construir una mesa -- Trazado de espigas -- Patas y largueros de mesas trazadas -- Maquinado de la madera -- Trazado de escopladuras -- Trazado de espigas -- Armado del armazón -- Armado del bastidor -- Cortar triplex -- Armado de la mesa -- Observacionesna36 página

The Quantum as an Emergent System

Double slit interference is explained with the aid of what we call "21stcentury classical physics". We model a particle as an oscillator ("bouncer") in a thermal context, which is given by some assumed "zero-point" field of the vacuum. In this way, the quantum is understood as an emergent system, i.e., a steady-state system maintained by a constant throughput of (vacuum) energy. To account for the particle's thermal environment, we introduce a "path excitation field", which derives from the thermodynamics of the zero-point vacuum and which represents all possible paths a particle can take via thermal path fluctuations. The intensity distribution on a screen behind a double slit is calculated, as well as the corresponding trajectories and the probability density current. Further, particular features of the relative phase are shown to be responsible for nonlocal effects not only in ordinary quantum theory, but also in our classical approach.Comment: 24 pages, 2 figures, based on a talk given at "Emergent Quantum Mechanics (Heinz von Foerster Conference 2011)", http://www.univie.ac.at/hvf11/congress/EmerQuM.htm

Вільна система ЧПУ для верстата паралельної структури

Application of LinuxCNC (open-source Linux based CNC software) to control parallel kinematic machine tools is considered. A control architecture and configuration files developed for LinuxCNC parallel kinematics machine tool with Stewart platform. Розглянуто використання вільної системи ЧПУ LinuxCNC з відкритим кодом для управління верстатами паралельної структури. Запропоновано структурну схему та файли конфігурації системи управління, використаної для верстата паралельної структури на основі платформи Стюарта

Managing assessment : student and staff perspectives

‘I never realised assessment was for learning’ Laura Ludman BSc (Hons) Nursing, University of Central England Managing Assessment: Student and Staff Perspectives is a practical tool developed by the Managing Effective Student Assessment (MESA) benchmarking club. It aims to give senior management, staff and educational developers, teachers, and support staff insight into assessment issues along with ideas and tools to enable them to improve student learning and reduce the burden on staff. It is hoped that, as well as enriching the learning experience, the case studies will also encourage students to reflect on their experiences of assessment and promote student and staff dialogue around assessment practices. The underlying principle of the Managing Effective Student Assessment (MESA) benchmarking club was the emphasis and value placed on the student perspective. However, it was recognised that assessment is complex and needs careful management. This includes appropriate strategies, structures and support to ensure effective student learning. The initiative was led by the Higher Education Academy (formerly the Learning and Teaching Support Network Generic Centre) and University of Central England (UCE) with the aim of refocusing staff time into providing better support for students and making student learning more effective. The MESA group comprised of a senior manager at departmental level, a member of the educational/faculty development staff and up to three students from each of eight institutions: the UCE, University of Brighton, Coventry University, De Montfort University, University of Glamorgan, Northumbria University, University of Sussex, and York St John College. The students and staff involved were from a range of different discipline areas and diverse institutions. The aims of the MESA group were to: • Share effective practices and issues in assessment; • Use assessment to enrich the student learning experience and seek to demystify assessment; • Enhance assessment practice to improve student retention and progression; • Manage change effectively and embed within institutions. The active involvement of students was facilitated through a student discussion forum which ran parallel to the inputs made by academic managers. The students were invited to discuss experiences of good assessment practice and identify assessment related issues that impacted on their experiences. The group then worked together to seek effective resolutions to the issues raised, which led to the creation of the case studies presented in this publication. The MESA project encouraged students and staff to learn from one another, as well as learning across subject boundaries and types of institutions. Managing Assessment: Student and Staff Perspectives was created in order to share this learning and to help others develop their understanding of what students need from assessment. It also considers how change can be managed and embedded within institutions

Design of a scanning tunneling microscope for electrochemical applications

A design for a scanning tunneling microscope that is well suited for electrochemical investigations is presented. The construction of the microscope ensures that only the tunneling tip and the sample participate in electrochemical reactions. The design also allows rapid replacement of the tip or sample, and enables facile introduction of auxiliary electrodes for use in electrochemical experiments. The microscope utilizes stepper motor driven approach mechanics in order to achieve fully remote operation and to allow reproducible coarse control of tip/sample spacings for electrochemical experiments. Highly ordered pyrolytic graphite images at atomic resolution in air and aqueous solutions can be obtained with this microscope

Design and construction of a configurable full-field range imaging system for mobile robotic applications

Mobile robotic devices rely critically on extrospection sensors to determine the range to objects in the robot’s operating environment. This provides the robot with the ability both to navigate safely around obstacles and to map its environment and hence facilitate path planning and navigation. There is a requirement for a full-field range imaging system that can determine the range to any obstacle in a camera lens’ field of view accurately and in real-time. This paper details the development of a portable full-field ranging system whose bench-top version has demonstrated sub-millimetre precision. However, this precision required non-real-time acquisition rates and expensive hardware. By iterative replacement of components, a portable, modular and inexpensive version of this full-field ranger has been constructed, capable of real-time operation with some (user-defined) trade-off with precision

The lunar cart

Expanded experiment-carrying capability, to be used between the Apollo 11 capability and the lunar roving vehicle capability, was defined for the lunar surface crewmen. Methods used on earth to satisfy similar requirements were studied. A two-wheeled cart was built and tested to expected mission requirements and environments. The vehicle was used successfully on Apollo 14