Mostrando recursos 1 - 20 de 1.442
Shaw, James; Reich, Alton
The invention comprises a method and/or an apparatus using a computer configured exercise system equipped with an electric motor to provide physical resistance to user motion in conjunction with means for sharing exercise system related data and/or user performance data with a secondary user, such as a medical professional, a physical therapist, a trainer, a computer generated competitor, and/or a human competitor. For example, the exercise system is used with a remote trainer to enhance exercise performance, with a remote medical professional for rehabilitation, and/or with a competitor in a competition, such as in a power/weightlifting competition or in a...
D. Kiš; T. Jurić; N. Voća; Duška Čurić; M. Mandurić
Recipes determine the quality of livestock feed and the hydraulic adders are one of the elements determining if the given recipe will be carried out. Generally, construction of existing adders does not allow accomplishment of that aim i.e. they do not meet recipe requirements. Consequently, researches which determined deviations in ingredient adding present with existing adders and with the experimental hydraulic adder were conducted. The research was conducted for two years (2005 and 2006) in two livestock feed factories in the Republic of Croatia on samples of feed mixtures for pigs weighing up to 15 and 25 kilos. Relative error...
Diseño de un Equipo para Secado Mecánico de Café y su Evaluación a Partir de la Construcción de un Modelo a Escala 1: 5
Henao Cuellar, José Duban; Perdomo Centeno, Luis Adolfo; Cuellar Pérez, Luis Enrique
Con el fin de mejorar el proceso de secado del café, se diseñó un equipo mecánico tipo silo, el cual tiene ventajas como: menor requerimiento de espacio para secar, es desarmable, reduce la mano de obra, disminuye el tiempo de secado y conserva la calidad del producto. El silo consta de dos cámaras de secado y el flujo de aire puede circular a través de estas realizando secado ó presecado dependiendo de la dirección del flujo empleada (sistema de compuertas), con lo cual se logra homogeneidad en la humedad final del grano. Además presenta un mecanismo práctico para el descargue...
Diseño de un sistema para la operación remota de una máquina trifásica de inducción mediante variador de frecuencia con interfaz Android sobre tablet-pc smartphone.
MARTÍNEZ LA OSA, PASCUAL
[ES] El presente Trabajo de Final de Grado aborda la operación y el control de un motor eléctrico de corriente alterna asíncrono mediante una aplicación móvil sobre sistema Android. El motor se alimenta a tensión y frecuencia variable por un variador de frecuencia industrial que recibirá las ordenes de una tarjeta de adquisición de datos la cual estará conectada de forma inalámbrica con un dispositivo móvil Android. El usuario recibe información del estado del sistema y emite las órdenes pertinentes a través de una interfaz gráfica gracias a la aplicación diseñada. La App que constituye uno de los resultados del TFG se ha desarrollado empleando el...
D Ghanbarian; A Ghorbani-marghmaleki; M.A Ghazavi; Sh Besharati
Introduction: Iran is one of the major producers of almonds. According to the statistics released by FAO (2011), Iran with more than 110000 tons of almonds is the third in rank throughout the world. However, most Iranian almonds are presented as an unsorted and unpackaged product. Some producers sort their products by hand which is very time-consuming and labor-intensive. So, there is an essential need for suitable grading and packaging machines especially for the export of almond kernels.Grading, which is sometimes called sorting, is basically separating the material in different homogenous groups according to its specific characteristics like size, shape,...
Investigating the effect of tractive parameters on imposed vertical stresses under driving wheel using a soil bin test rig facility
H Taghavifar; A Mardani
Introduction: Tire tractive parameters of the driving wheel are of the most substantial factors for the evaluation of the performance of agricultural tractors. Great tractive efficiency has called the attention of vehicle designers to attain economic efficiency owing to the minimization of fuel consumption. At terrain-tire interface, some soil physical-mechanical changes occur that lead to unwanted soil compaction. Of the influential parameters for the creation of soil compaction is the soil stresses formed owing to the wheeled vehicle trafficking. While the increase of tractive efficiency is desired, minimization of soil stresses should also be considered with the same importance to...
James B Snyder; Mark E Nelson; Joel W Burdick; Malcolm A Maciver
Active sensing organisms, such as bats, dolphins, and weakly electric fish, generate a 3-D space for active sensation by emitting self-generated energy into the environment. For a weakly electric fish, we demonstrate that the electrosensory space for prey detection has an unusual, omnidirectional shape. We compare this sensory volume with the animal's motor volume--the volume swept out by the body over selected time intervals and over the time it takes to come to a stop from typical hunting velocities. We find that the motor volume has a similar omnidirectional shape, which can be attributed to the fish's backward-swimming capabilities and...
Alejo Rodríguez-Cattaneo; Ana Carolina Pereira; Pedro A Aguilera; William G R Crampton; Angel A Caputi
Understanding fixed motor pattern diversity across related species provides a window for exploring the evolution of their underlying neural mechanisms. The electric organ discharges of weakly electric fishes offer several advantages as paradigmatic models for investigating how a neural decision is transformed into a spatiotemporal pattern of action. Here, we compared the far fields, the near fields and the electromotive force patterns generated by three species of the pulse generating New World gymnotiform genus Gymnotus. We found a common pattern in electromotive force, with the far field and near field diversity determined by variations in amplitude, duration, and the degree...
Comparative evaluation of light-trap catches, electric motor mosquito catches and human biting catches of Anopheles in the Three Gorges Reservoir.
Wang Duo-quan; Tang Lin-hua; Gu Zhen-cheng; Zheng Xiang; Yang Man-ni; Jiang Wei-kang
The mosquito sampling efficiency of light-trap catches and electric motor mosquito catches were compared with that of human biting catches in the Three Gorges Reservoir. There was consistency in the sampling efficiency between light-trap catches and human biting catches for Anopheles sinensis (r = 0.82, P<0.01) and light-trap catches were 1.52 (1.35-1.71) times that of human biting catches regardless of mosquito density (r = 0.33, P>0.01), while the correlation between electric motor mosquito catches and human biting catches was found to be not statistically significant (r = 0.43, P>0.01) and its sampling efficiency was below that of human biting catches. It is concluded that light-traps can...
A. Mansouri; T. Hafedh
Recently, electric vehicle motoring has become a topic of interest, due to the several problems caused by thermal engines such as pollution and high oil prices. Thus, electric motors are increasingly applied in vehicle’ applications and relevant research about these motors and their applications has been performed. Of particular interest are the improvements regarding torque production capability, the minimization of torque ripple and iron losses. The present work deals with the optimum design and the performance investigation of an outer rotor permanent magnet motor for in-wheel electric vehicle application. At first, and in order to find the optimum motor design,...
Tiba Zsolt (1965-) (gépészmérnök); Kertész József (1955-) (villamosmérnök); Husi Géza (1962-) (gépészmérnök, számítógépes tervezőmérnök); Békési Zsolt (1988-) (gépészmérnök)
NÚÑEZ CHOVER, CÉSAR
El presente proyecto tiene como objetivo el diseño de un reductor para el accionamiento de una cinta transportadora de carbón de una central térmica. Se dispone de un motor eléctrico de: - 55 KW - 1500 rpm para mover la cinta transportadora de carbón para la alimentación del hogar.
AGEING OF A THREE-LAYER PAPER USED IN THE INSULATION OF AN ELECTRIC MOTOR FOR THE AUTOMOTIVE TRACTION
Loubeau, Florian; Rain, Pascal; Durieux, Anne
Enno Sabelberg; Maria Cardenas; Reinhold Kneer; Wilko Rohlfs
Efficient liquid cooling systems in cutting and chipping processes are essential to remain below the temperature limits of the cutting tool and materials. Impinging jet cooling near the processing location is a widely employed technique for this purpose. The cooling effect can be optimized using a pulsating cooling fluid to improve heat transfer, via a periodic renewal of the hydrodynamic and thermal boundary layer. This study focuses on a cooling nozzle which generates a passive jet excitation, without an electric motor or any valve system. Four different nozzle design mechanisms for the jet excitation were developed and tested with respect to...
Mode of access: Internet.
Jozef Mascenik; Slavko Pavlenko; Imrich Vojtko
The paper deals with the alternative of determination of state of the belt gear. To realize themeasurements a newly developed device was designed for measurement and diagnostics of the belt gears. The main task is to detect the V-belt slip expressed by the coefficient of elastic creep and of specific slip with a measuring device. The measurements regarding can be performed if input revolutions of the electric motor and torque of the belt gear are constant whereas the tensioning force of the belt gear changes. It is also possible to perform the measurement if the input revolutions of the electric...
For many industrial applications that including ele ctric motor, selecting of the appropriate motor type is keypoint for the application success and efficiency. This paper presents a comparative performance evaluation between direct t orque controlled Brushless AC and Brushless DC motors which have been considered as t raction motor on electric vehicles. Moreover, a short review to brushless AC and brushl ess DC motor technology and vector driver systems are also included. The main structure of th e direct torque control method is presented and small-scale pure electric vehicle model is inte grated to the motor control model. To make a fair comparison, the brushless AC...
Report to the President by the Emergency Board appointed January 14, 1948 pursuant to section 10 of the Railway labor act, as amended, to investigate unadjusted disputes between the Chicago, North Shore and Milwaukee Railway Company and certain of its employees represented by International Union of Amalgamated Association of Street Electric Railway and Motor Coach Employees of America, a labor organization.
United States. Emergency Board (Chicago, North Shore and Milwaukee Railroad Company, 1948); Schwartz, Harry H.; Amalgamated Association of Street, Electric Railway and Motor Coach Employees of America.
Signed, Harry H. Schwartz, chairman, Russell Wolfe, Robert E. Stone.
Intraoperative Neurophysiological Monitoring for Endoscopic Endonasal Approaches to the Skull Base: A Technical Guide
Harminder Singh; Richard W. Vogel; Robert M. Lober; Adam T. Doan; Craig I. Matsumoto; Tyler J. Kenning; James J. Evans
Intraoperative neurophysiological monitoring during endoscopic, endonasal approaches to the skull base is both feasible and safe. Numerous reports have recently emerged from the literature evaluating the efficacy of different neuromonitoring tests during endonasal procedures, making them relatively well-studied. The authors report on a comprehensive, multimodality approach to monitoring the functional integrity of at risk nervous system structures, including the cerebral cortex, brainstem, cranial nerves, corticospinal tract, corticobulbar tract, and the thalamocortical somatosensory system during endonasal surgery of the skull base. The modalities employed include electroencephalography, somatosensory evoked potentials, free-running and electrically triggered electromyography, transcranial electric motor evoked potentials, and auditory...
Julius Caesar Puoza; Frimpong Opoku; Bernard Aboagye
A motorized cassava fufu pounding machine was developed and tested. The machine principal parts were hopper, throat, pounding compartment, discharge outlet, main frame, electric motor seat, auger, shaft and pulleys. Mild steel material and stainless steel sheet were used in the fabrication based on its availability, strength, appearance, cost, and corrosion resistance. The machine is powered by a 5hp electric motor; the dimension of the machine is 1010mm × 600mm × 930mm (length × breadth × height). Output capacity of 120kg/hr was obtained. The machine is affordable and easy to operate and manage. It is therefore recommended for the restaurants,...