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排序方式: 共有321条查询结果,搜索用时 15 毫秒
81.
A. C. Hill L. G. Transtrum M. R. Pack A. Holloman JR. 《Journal of the Air & Waste Management Association (1995)》2013,63(1):22-27
The principle of fabric filtration has only recently been accepted for fossil fuel fired boiler particulate emissions control. Information on design criteria is, therefore, limited. The paper provides data on the few installations where baghouses have been installed and successfully operated. The general conclusion is that a strong relationship exists between air to cloth ratio and bag life. 相似文献
82.
83.
The acid-base status of two sea urchins, Psammechinus miliaris (Gmelin) and Echinus esculentus (L.) during experimental emersion has been investigated. Sea urchins were collected from the Firth of Clyde between August and September 1987. The carbon dioxide capacity of the coelomic fluid of P. miliaris was greater than that of E. esculentus, although both were low and only marginally greater than that of sea water. The pH of the coelonic fluid was also low (7.05 to 7.17) and was influenced mainly by the internal partial pressure of CO2 (PCO
2). Acid-base disturbance in the coelomic fluid of both species during emersion, although minimal, was more pronounced in E. esculentus than in P. miliaris and was due primarily to an increase in the internal PCO
2, although there was an increase in the concentration of L-lactate in the coelomic fluid of E. esculentus. The coelomic fluid of both species was in a state of perfectly compensated respiratory acidosis. An increase in the concentration of divalent ions (Ca2+ and Mg2+) may be related to the dissolution of the test as a source of carbonate buffer. 相似文献
84.
85.
A. Clyde Hill 《Journal of the Air & Waste Management Association (1995)》2013,63(6):341-346
The possibility of vegetation being an important sink for gaseous air pollutants was investigated. Plant pollutant uptake measurements were made utilizing a typical vegetation canopy and chambers that were designed specifically for gaseous exchange studies. The data indicate that an alfalfa canopy removed gases from the atmosphere in the following order: hydrogen fluoride (HF) > sulfur dioxide (SO2) > chlorine (Cl2) > nitrogen dioxide (NO2) > ozone (O3) > peroxyacetyl nitrate (PAN) > nitric oxide (NO) > carbon monoxide (CO). The absorption rate of NO was low, and no absorption of CO could be detected with the methods used. In the typical ambient concentration range uptake increased linearly with increasing concentration except for O3 and Cl2 which caused partial stomatal closure at the higher concentrations. Wind velocity above the plants, height of the canopy, and light intensity were shown to affect the pollutant removal rate. A relationship between the absorption rate and solubility of the pollutant in water was also shown. It was concluded that vegetation may be an important sink for many gaseous air pollutants. 相似文献
86.
87.
Christopher E. Hill S. Elizabeth Campbell J. Cully Nordby John M. Burt Michael D. Beecher 《Behavioral ecology and sociobiology》1999,46(5):341-349
Sharing song types with immediate neighbors is widespread in birds with song repertoires, and sharing songs may confer a
selective advantage in some cases. Levels of song sharing vary between different geographical populations of several bird
species, and ecological differences often correlate with differences in singing behavior; in particular, males in migratory
subspecies often share fewer songs than males in resident subspecies. The song sparrow (Melospiza melodia) appears to fit this pattern: resident song sparrows in western North America generally share 20–40% of their repertoire
(of about eight songs) with each neighbor, while migratory subspecies from eastern North America often share 10% or less.
We compared song sharing in two populations within a single subspecies of song sparrow (M. m. morphna) in Washington State. These populations, separated by only 120 km, nonetheless differ in migratory tendencies and several
other ecological and life history variables. We recorded complete song repertoires from 11 male song sparrows in a high-elevation,
migrating population at Gold Creek in west-central Washington, and compared them to two samples (n = 15 and n = 36) from a coastal, resident population at Discovery Park, Seattle, Washington. Despite major differences in habitat, population
density, and migratory tendencies, song sharing among Gold Creek males was as high as that among Discovery Park males. In
both populations, sharing was highest between immediate neighbors, and declined with distance. We conclude that at the within-subspecies
level, neither migration nor population density affect song sharing in song sparrows, a song repertoire species.
Received: 26 November 1998 / Received in revised form: 1 May 1999 / Accepted: 29 May 1999 相似文献
88.
The commercial sea cucumber species known as Sandfish (Holothuria scabra) occurs intertidally and subtidally in the Northern Territory of Australia, on or adjacent to Aboriginal land. A 4-yr program of community-based fisheries research with Aboriginal Australians was implemented to assess the viability of indigenous Australians' involvement in the wild-stock fishery. The research involved extensive and intensive indigenous participation, unusual in Australian biophysical sciences research, during field survey and habitat mapping, complemented by commercial catch data modelling and discussion of its implications. Field surveys produced Sandfish distribution and site-specific density, and revealed some areas that were not commercially fished. Catch data modelling results suggested that no additional effort could be sustained, however commercial fishers increased their effort, expanding their operations into the newly mapped areas. These actions effectively precluded indigenous peoples' aspirations of entry into the commercial fishery. The efficacy and outcomes of participatory program design with indigenous Australians need critique in the absence of the political will and statutory backing to provide equitable access to resources. 相似文献
89.
J. Ernest Flaek Duane W. Hill 《Journal of the American Water Resources Association》1970,6(4):563-572
Water resources management in the urban areas of the United States to be effective must include dimensions far beyond water supply and sewerage. This paper concerns itself with those problem areas of water resource management outside of potable water supply and sanitary sewers. These areas include flood plain management, greenways and blueways, storm water, vistas of waterways, and other attributes of living in or near a water-related environment. The perceptions and attitudes of the concerned public and community power structure must be known in order to manage the water environment effectively. Methods of measuring these perceptions and attitudes are described and ways in which the resulting citizen-resource can be tapped and used as a management device are explored. 相似文献
90.
Geraldine A. Wright David Raubenheimer Steven Hill Stephen J. Simpson 《Chemoecology》2000,10(2):59-67
Summary.
Schistocerca gregaria, the desert locust, has been shown to regulate its dietary intake with respect to specific macronutrients in synthetic foods.
This study examined the nutrients in the leaves of two starch mutants of Arabidopsis thaliana, and then compared the feeding behaviour of locusts on the two starch mutants. The high-starch mutant had c. 25 times more starch than the no-starch mutant. Newly molted 5th stadium locusts were preconditioned for 3 days on one of
the mutants, and then observed for 90 min while exposed to the same or the alternative mutant. Locusts pretreated with the
no-starch mutant fed longer during the first meal on high-starch mutants, spent more time feeding, and had the smaller latency
to begin a meal when compared to the locusts pretreated on the high-starch mutant. The results of the study are interpreted
in light of an integrative model of nutrient balancing.
Received 16 November 1999; accepted 23 December 1999 相似文献