Results 1 - 10 of 52
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[en] A relation between the two time-scales is found from considerations of particle acceleration which agrees well with experimentally determined values. Two basic assumptions are made: that the rate of change of particle velocity, relative to the mean wind, is due primarily to its transition through the complex turbulent field and not to the local time-distortions of this field; also that the Eulerian and Lagrangian acceleration-correlograms are mathematically similar. Extensions to two and three-dimensional turbulent fields are possible but cumbersome and result in little change in the timescale relationship. (author)
[en] For the precipitation scavenging of submicron particles, inertial effects are shown to be negligible by transforming Newton's law to the mass independent Smoluchowski equation. The importance of electrical effects can be displayed theoretically but its evaluation requires more specific information about the charges on raindrops and particles. Heat transfer data is utilized to calculate the washout coefficient and the result is found to be a factor of two to ten below Ziman's. (author)
[en] This paper describes the rise of strongly radioactive plumes. If a portion of the gases in a plume is radioactive, heat will be supplied continuously to each plume element by radioactive decay, producing buoyant rise. A plume could also acquire buoyancy through chemical reactions, thermal radiation effects, or latent heat exchange. This paper considers the plume rise that results from such buoyancy addition at a uniform rate.
[en] This article outlines the quantitative attempts at describing pollution levels produced by chimney stacks. Since the early days the notion of an effective chimney height (ECH) has taken hold in assessing the effects of buoyancy on the dispersal of effluents. This essentially engineering concept is quite attractive at first sight and is based on the recognition that the main criterion (as far as air pollution problems are concerned) in designing a chimney is the maximum ground level concentration of effluent.
[en] Gage points are given with the help of which the most commonly required atmospheric diffusion calculations can be carried out rapidly using a simple slide-rule setting; e.g. maximum ground concentration, its distance, and the corresponding effective stack height as functions of the prevailing type of meteorological condition. (author)
[en] It is the purpose of this paper to describe the Air Pollution Project that is being undertaken at the Ecole d'Hygiene of Universite de Montreal. The project is still in its organization phase. However, in the absence of any results, a description of the project with an emphasis on its goals, instrumentation and operational technique might prove interesting and raise comments beneficial to the project. (author)
[en] Wind speed, wind direction and stability measurements collected by the Meteorology Group at the Argonne National Laboratory have been used to evaluate the hazards associated with an assumed maximum credible reactor accident. Comparison of these results with those based on a constant wind direction, 2 meter per second wind speed and inversion conditions indicates a reduction factor of 10 for a 30-day iodine inhalation dose is reasonable when meteorological conditions are used. (author)
[en] This paper describes the research in meteorology at the Chalk River Labs. The research has been dictated by the needs of radiation protection. The research involves the dispersion of stack gases and the deposition of airborne radioactive contaminants onto the surface of the earth.
[en] This has been the third of a series of conferences sponsored by the United States Atomic Energy Commission held at National Laboratories. The two previous ones, held at Hanford and Brookhaven, were in 1960 and 1964. An evolutionary trend can be discerned at each meeting. This conference is the first to have been held outside the United States and this time a large number of Canadians participated as well as meteorologists from overseas. Papers describing site programmes have been omitted from these proceedings which consequently are now entirely devoted to original research contributions and the discussion they provoked. (author)
[en] The mesometeorological data used in turbulence and diffusion studies can be used to provide information that affect aircraft operations in the terminal area. It includes: (1) wind shear, (2) low level turbulence, (3) conditions that propagate or dissipate aircraft wake turbulence, (4) amount of agent to use in the dissipation of fog, and (5) the propagation of noise. The FAA planned programs in wake turbulence and noise abatement are discussed. (author)