Modern Electrical Equipment Research Articles

Electricidad en endocirugía

Aunque la electrocirugía ha estado con nosotros por muchas décadas, muy pocos cirujanos han tenido un entrenamiento formal sobre la naturaleza de la electricidad y las leyes físicas que gobiernan esta, afectando sus aplicaciones clínicas potenciales.La creencia errónea de que las técnicas electroquirúrgicas incrementan el proceso de cicatrización o deterioran los procesos curativos, ha determinado que muchos los cirujanos adopten otras fuentes de energía más costosas.En la medida que comprendamos más los principios electroquirúrgicos, acompañado esto del uso de modernas unidades electroquirúrgicas con mandos comprensibles, con un polo a tierra superior, e instrumental para cirugía endoscópica con cubiertas aislantes mejoradas, determinará que la electrocirugía sea usada en una forma más amplia y con mayor confianza.

Calculation of the emission of nitrogen oxides in electric resistance heating furnaces

The present paper is devoted to the least studied topic in the field of use of modern electric heating equipment, namely, pollution of the atmosphere by nitrogen oxides and reduction of the intensity of this effect by coating furnace linings. Experimental and theoretical estimates of reduction of the emission of nitrogen oxides in electric furnaces with a lining with an intensifying refractory coating of the IVA-2 and IVAKS-2 types and an algorithm for calculating the emission of nitrogen oxides are presented. The plotted process of metal heating in an electric furnace shows that the use of IVA-2 and IVAKS-2 refractory coatings decreases the emission of nitrogen oxides by 22–28% both in a still oxidizing medium and under forced feeding of air into the heating zone. A method for calculating the characteristics of the process of emission of nitrogen oxides in electric furnaces is suggested. Results of the work can be, applied to heating and heat-treatment furnaces of forging and rolling mills, especially in environmentally vulnerable regions.

Applications and product development in varistor technology

Modern electrical and electronic equipment is exposed to several transient voltage threats which endanger the integrity of components, systems and even people. Several transient voltage suppression solutions are available. This presentation will give an update of new varistor configurations developed recently by Harris Semiconductor Division, to protect against transient overvoltages. The products to be dealt with will cover the low power-lower energy applications such as integrated circuits, automotive systems and other modern electronic examples as well as industrial equipment and power distribution networks. The product configuration and specifications will be presented, together with the range of applications where they can be used to deal with the expected transient environment.

Computerized automation of optical systems of the analytical ultracentrifuge

Data obtained from experiments by use of an ultracentrifuge, are either given in the form of photos of the refractive index curve, or as registrations of the absorption-profiles, occurring within the cell, which are registered by differential records. Until now only sophisticated and time-consuming data analyses have been applied to measurements of diffusion and sedimentation coefficients by use of photos and records. For improving data handling the optical systems of the ultracentrifuge were computerized by using modern electric equipment. Schlieren photos are handled with a digitizer, scanner registrations by an AD-converter combined with a PC. Various programs are shown for further data acquisition. The specific software and the significant improvements resulting from this procedure, are discussed in the determination of diffusion coefficients.

Electrical Installation Techniques for a Large Film Production Center

The electrical system installed in the new MPO Videotronics film center provides either a-c or d-c power through remotely controlled contactors for multistage operation. The use of bus duct, circuit breakers, voltage regulators, remote indicating panels, plug-in boxes, silence-system, public address system, supervisory control, fire alarm system and other modern electrical equipment and methods of installation combine to form the nerve center of this project.

Modern electrical equipment for industrial diesel-electric locomotives

Modern electrical equipment for industrial diesel-electric locomotives

Modern Electrical Equipment for Industrial Diesel-Electric Locomotives

Modern electrical equipment for industrial Diesel-electric locomotives is widely different in many respects from that used five or six years ago. New and improved high-temperature insulating materials and modern synthetic varnishes have been developed and are used extensively today. Also new and improved methods of using these and the older materials have been developed. These, together with new design constants, have made possible a reduction in weight per horsepower transmitted with an improvement in the quality of the product. The Diesel engine and generator are close-coupled and mounted as a unit, thus assuring proper alignment and, at the same time, reducing the space required for mounting on the locomotive. A new and improved method of generator excitation has been developed which assures positive control of the engine speed and power. This provides a very flexible transmission of power from the prime mover to the rail. The modern traction motor has a cylindrical instead of a rectangular frame. It is a multipole instead of the conventional fourpole design. It is mounted integral with a double-reduction gear unit which is completely enclosed in an oiltight gear case. All bearings on the motor armature shaft and in the gear case are antifriction except those on the axle, which are sleeve bearings. All bearings in the gear unit are oil-lubricated with the same oil that lubricates the gearing. Both the high and low speed pinions are straddle-mounted to insure proper alignment of the gearing at all times.

Modern electrical equipment for industrial diesel-electric locomotives

FOR many years most of the machinery in American industrial plants has been driven electrically. During the past five or six years Diesel-electric drive has taken a definite place in moving raw materials to and finished products away from the manufacturing plants. This widespread use of electric power for locomotives has been brought about largely by two simultaneous developments.