منابع مشابه
Fundamental Principles of Gas Turbine Meters
The majority of all gas measurement used in the world today is performed by two basic types of meters, positive displacement and inferential. Positive displacement meters, consisting mainly of diaphragm and rotary style devices, generally account for lower volume measurement. Orifice, ultrasonic and turbine meters are the three main inferential class meters used for large volume measurement tod...
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The advantages and disadvantages of sources emitting either a continuous or a discontinuous spectrum are considered in connection with the use of such lamps as a standard of ultraviolet radiation. It is shown that because of the high intensity and favorable distribution of the ultraviolet emission lines at 2967 to 3132 A, the quartz mercury-arc lamp is well adapted for standardizing photoelectr...
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Different types of telecommunication antennas, especially BTS antennas established in residential areas, emit radio frequency (RF) electromagnetic energy. So, community concerns over the health effects from their exposure are growing. To perform hazard assessment related to radio frequency radiation both at telecommunications sites and residential areas, and also to ensure compliance with natio...
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This paper outlines the operating principles and application of ultrasonic gas flow metering for custody transfer. Basic principles and underlying equations are discussed, as are considerations for applying ultrasonic flow meter technology to station design, installation, and operation. These applications are illustrated based on operating experience with the SICK ultrasonic flow meter, however...
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This paper discusses fundamental issues relative to ultrasonic gas flow meters used for measurement of natural gas. A basic review of an ultrasonic meter’s operation is presented to understand the typical operation of today’s Ultrasonic Gas Flow Meter (USM). The USM’s diagnostic data, in conjunction with gas composition, pressure and temperature, will be reviewed to show how this technology pro...
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ژورنال
عنوان ژورنال: Physical Review (Series I)
سال: 1906
ISSN: 1536-6065
DOI: 10.1103/physrevseriesi.22.294