405 research outputs found
Handmade series direct-current motor
Using common materials, it is possible to build a variety of very simple - and yet functioning - electric devices. These devices can be used to verify Electromagnetism fundamentals. Electric currents within magnetic fields originate forces and that is the basic principle of operation of electric motors. This paper describes a universal series motor made with iron bars, insulated copper wire, two small brass plates, insulating tape, six screws and a couple of hoops. The motor is fed with a personal computer 12V DC switched power supply. Rotor speed can achieve several rotations per second
Microcontroller-driven hydrogen car
This paper presents a hydrogen-powered car with 8 minutes autonomy. The hydrogen is produced by electrolysis, which requires an external power supply. The gas is retained on an isolated compartment in the car. Then, it goes to the fuel cell, which produces the energy for the car motor. The car follows a white line on a black track using five infrared sensors that detect white and black colors. A servomotor controls its direction. Guidelines to the servomotor are given by a system based on an 8051 microcontroller, according to the information it receives from the infrared sensors
Induction coil gun
This paper describes a device capable of throwing metal rings at a range of a few meters. Part of an iron pipe is inserted on a coil. A conducting non-ferromagnetic ring is inserted in the pipe through its other extremity. An alternating current flowing through the coil creates an alternating magnetic field, which magnetizes the iron pipe. So, an alternating magnetic field is created around the pipe and induces a circumferential current flowing in the ring. This current is repelled by the magnetic field, forcing the ring to jump out of the pipe
Electromagnetic shoot
The science fair device described in this paper shoots a miniature soccer ball using a solenoid and a two-piece rod made of iron and nylon. The nylon part of the rod is introduced inside the solenoid and a ball is placed at its extremity. When an electrical current passes through the solenoid, the iron part of the rod is pushed into its center, causing the shooting of the ball. This mechanism, originally developed for Minho Team soccer robots, has been successfully used for several years. The science fair version includes a slewing iron case and overheat protections
Electromagnetic shoot
The science fair device described in this paper shoots a miniature soccer ball using a solenoid and a two-piece rod made of iron and nylon. The nylon part of the rod is introduced inside the solenoid and a ball is placed at its extremity. When an electrical current passes through the solenoid, the iron part of the rod is pushed into its center, causing the shooting of the ball. This mechanism, originally developed for Minho Team soccer robots, has been successfully used for several years. The science fair version includes a slewing iron case and overheat protections.Robótica 2006 – Festival Nacional de Robótica (National Robotics Festival), Guimarães, Portugal, April 28 – May 1, 200
Electric power generating bicycle
It is manifest the growing interest in both personal health and environmental issues. The device described on this paper contemplates both aspects: generating environment-friendly electric power while keeping fit. A car alternator excited through a 12V battery is coupled to a mountain bicycle, and this arrangement enables the lighting of six halogen lamps, if a cyclist pedals fast enough. Such a machine gives rise to the thought of a self-powered gymnasium. Considerable physical effort is required in order to make the lamps glow, which is pedagogical since it shows clearly that spending energy is much easier than generating it
Position and orientation errors in mobile robot absolute self-localization using an improved version of the generalized geometric triangulation algorithm
Triangulation with active beacons is widely used in the absolute localization of mobile robots. The original Generalized Geometric Triangulation algorithm suffers only
from the restrictions that are common to all algorithms that perform self-localization through triangulation. But it is unable
to compute position and orientation when the robot is over the segment of the line that goes by beacons 1 and 2 whose origin is beacon 1 and does not contain beacon 2. An improved version of the algorithm allows self-localization even when the robot is over that line segment. Simulations results suggest that a robot
is able to localize itself, with small position and orientation errors, over a wide region of the plane, if measurement uncertainty is small enough
Generalized geometric triangulation algorithm for mobile robot absolute self-localization
Triangulation with active beacons is widely used in the absolute localization of mobile robots. The Geometric Triangulation algorithm allows the self- localization of a robot on a plane. However, the three beacons it uses must be “properly ordered” and the algorithm works consistently only when the robot is within the triangle formed by these beacons. This paper presents an improved version of the algorithm, which does not require beacon ordering and works over the whole navigation plane except for a few well-determined lines where localization is not possible
Lna santé - the home care pioneer in France
Begun operating in 1992 and today is ready to be bought and to grow massively in the upcoming years .LNA Santé, the fifth French player in the long-term care market ,will be acquired in 2019 in a Private Equity deal and will improve its operations in Europe. This deal is expected to return 3.1 x the money invested by the fund and an internal rate of return of almost 26% with an exit in five years(2023). This successful exit is possible due to an ageing population that is set to in crease demand for dependent care which is reflected in the number of nursing home beds forecasted to double. By the time of exit, the firm will amount €828 Mofre venues and €94 Mof EBITD As treaming from consolidation of operations in the current operating countries–France and Belgium–and an internationalization bet in the Netherlands. It is presumed that this paper will inform how a deal in Private Equity -term care market in Europe is conducted
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