Results 261 to 270 of about 152,644 (306)
Some of the next articles are maybe not open access.
A wide-range adjustable-speed drive
Electrical Engineering, 1949This paper describes the theory and characteristics of a drive which provides a wide range of adjustable speeds. The ratio of the maximum to minimum useful speeds attainable is approximately 20-to-1. The system provides high starting-torque, relatively high efficiencies and rapid deceleration through regenerative braking.
A. G. Conrad, E. R. Tribken
openaire +1 more source
Industry Structure and the Speed of Price Adjustment
The Journal of Industrial Economics, 1983RECENT work has suggested that there is an association between the degree of concentration in an industry and the speed at which prices adjust to changes in prime costs (Cagan [8], Domberger [12, 13], Scherer [21], p. 356 and the references cited therein).
openaire +1 more source
2001
Four decades have passed since our celebrant, then a young student at Johns Hopkins, attended my class in Public Finance. He was told that the fiscal system must address three concerns—the provision of public goods, equity in distribution and macro stability.
openaire +1 more source
Four decades have passed since our celebrant, then a young student at Johns Hopkins, attended my class in Public Finance. He was told that the fiscal system must address three concerns—the provision of public goods, equity in distribution and macro stability.
openaire +1 more source
Dynamic speed adjustment of a machine tool
2010 5th IEEE International Conference Intelligent Systems, 2010We present analytical results related to a tool management model for a flexible machine equipped with a tool magazine, variable cutting speed, and sensors to monitor tool wear, when tool life due to flank wear is stochastic. Under some regularity conditions, we derive the special structure of decision rules for adjusting the cutting speed as a function
openaire +1 more source
Reliability of Adjustable Speed Drives
IEEE Industry Applications Magazine, 2010The reliability of ASDs has improved very much. The resulting MTBF from realistic estimation (which is 44 years) shows an MTBF for standard LV drives that will be acceptable for most applications in the chemical industry where programs such as "Improve Equipment Reliability," "Equipment Justification and Minimization," and "Risk-Based Engineering" are ...
Peter Pieters, Jari Riikonen
openaire +1 more source
Optimum International Reserves and the Speed of Adjustment
Journal of Political Economy, 1970In the current debate on international monetary reform the protagonists can be grouped into two main camps. On the one hand, the AngloAmericans maintain that what is most urgently needed is a major addition to the stock of international reserves. They fear that without a larger supply of international means of payment countries will be forced to adopt ...
openaire +1 more source
1994
Adjustable-speed drives have been a stalwart contributor to the success of many of the world’s industrial processes for years. Textile fiber manufacturing, steel mill rolling, automobile tire cord processing, and a myriad of other processes utilize adjustable-speed electric drives in the manufacturing process. High energy costs are now causing interest
openaire +1 more source
Adjustable-speed drives have been a stalwart contributor to the success of many of the world’s industrial processes for years. Textile fiber manufacturing, steel mill rolling, automobile tire cord processing, and a myriad of other processes utilize adjustable-speed electric drives in the manufacturing process. High energy costs are now causing interest
openaire +1 more source
Adjustable‐Speed Pumps for Utilities
Journal AWWA, 1961This article discusses the suitability of adjustable‐speed centrifugal pumps for systems for which pipe friction is a predominant factor to be considered. Fewer adjustable‐speed pumps than constant‐speed pumps are required for a given job. The savings that result from the use of fewer units more than offset the initial higher cost of variable‐speed ...
Adam W. Kubik, Kenneth H. McEwan
openaire +1 more source
IEEE Power Engineering Review, 1982
Today, high energy costs and the availability of large (Example: 3000A, 4000V) solid- state devices are forcing industry to look at new and different adjustable speed drives. This paper introduces three different types of adjustable able speed drives for use on large fans and mixed flow pumps. The three systems are: (1) the current source inverter; (2)
Charles LeMone, Tadahiko Takeishi
openaire +1 more source
Today, high energy costs and the availability of large (Example: 3000A, 4000V) solid- state devices are forcing industry to look at new and different adjustable speed drives. This paper introduces three different types of adjustable able speed drives for use on large fans and mixed flow pumps. The three systems are: (1) the current source inverter; (2)
Charles LeMone, Tadahiko Takeishi
openaire +1 more source
1995
Abstract : This TechData Sheet is intended to help activity personnel identify cost effective energy projects for energy projects for Adjustable Speed Drives (ASDs). With this guide an energy manager can identify when an ASD is applicable and do a first-run evaluation of the project payback.
openaire +1 more source
Abstract : This TechData Sheet is intended to help activity personnel identify cost effective energy projects for energy projects for Adjustable Speed Drives (ASDs). With this guide an energy manager can identify when an ASD is applicable and do a first-run evaluation of the project payback.
openaire +1 more source