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  • 1990-1994  (5)
  • 1970-1974  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Improved modeling of surface charge distributions in electret ionization chambers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 730-735 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Additional considerations are discussed concerning the modeling of time-dependent surface charge distributions in electret ionization chambers during the charging and discharging of electrets with ionizing radiation. Estimates of position-dependent ion density in the charging chamber are made using (a) a single-scattering calculation of ionization due to recoil electrons and (b) an isotropic, inverse-square approximation of ionization density. These estimates are used in conjunction with a subroutine which solves Laplace's equation for electric field and tracks charge carrier trajectories from the point of origin in the chamber to an electret surface where the charge becomes trapped. The results of improved measurements are also shown and compared with calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145093
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling of surface charge distributions in electret ionization chambers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1627-1632 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Computer modeling of the change of electret surface-charge distribution within electret ionization chambers (EIC) during the electret charging and discharging processes are described. Assuming a uniform and constant rate of ion generation, the theory of ion recombination in air is applied to Laplace's equation to develop a description of the rate of charge accumulation and surface charge distribution. It is shown that distortions of electric fields within the air gap of the EIC control the distribution of charge accumulation, while saturation conditions, that determine the level of recombination of charges within the air gap of the EIC, control the maximum potential that can be deposited onto the electret surface. Results of modeling are compared with measured data, and suggestions for refinement in the model are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144037
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Diamine oxidase, urticaria and intestinal oedema (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 20 (1990), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1990.tb02791.x
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    INFLUENCE OF NITRITE AND NITRATE CURING INGREDIENTS ON QUALITY OF PACKAGED FRANKFURTERS (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 38 (1973), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1973.tb02114.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Direct observations of feeding structures and mechanisms in bivalve molluscs using endoscopic examination and video image analysis (1991)
    Springer
    Marine biology 111 (1991), S. 287-291 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new technique is described for observing the structures and mechanisms of suspension feeding in bivalves using endoscopic examination and video image analysis. This method permits direct in vivo observations of whole, intact structures of relatively undisturbed specimens. No surgical alterations of shell or tissue are required for most species. Pallial organ activity can be recorded for future observations and analysis. Using this technique we examined three bivalve species, each with different degrees of mantle fusion:Mya arenaria L.Mytilus edulis L., andPlacopecten magellanicus (Gmelin). The specimens were collected between April and September 1990 at various locations in Trinity Bay, Newfoundland, Canada. Particle retention by the gill and transport of material to the palps was observed, and velocity of particles moving on the gill was determined. We demonstrate that the endoscope-video-analysis system is an efficient and affordable technique suitable for studies of pallial organ function and mechanisms of feeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01319711
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Lipid composition of eggs and adductor muscle in giant scallops (Placopecten magellanicus) from different habitats (1992)
    Springer
    Marine biology 113 (1992), S. 71-76 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Scallops (Placopecten magellanicus Gmelin) were collected during August 1989 from shallow water (10 m) and deep water (31 m) habitats at Sunnyside, Trinity Bay, Newfoundland, to compare the lipid composition of eggs and adductor muscle tissue. Less favorable food levels and lower temperature conditions associated with deeper water have previously been shown to produce slower growth and reduced fecundity in individuals from this habitat. Triacylglycerol reserves consistently accounted for 60% of the total lipids present in both groups. The total lipid content of the eggs and the composition of their triacylglycerol fatty acid pools were similar in shallow water and deep water scallops, indicating very little if any nutritional difference between the two groups. Relative to their counterparts from shallow water, individuals from deeper water contained higher proportions of docosahexaenoic acid [22:6(n-3)] in the egg phospholipids and higher levels of 24-methylenecholesterol (a phytosterol commonly found in diatoms) in the adductor muscle. Differences in fatty acid composition are interpreted as biochemical adjustments of cell membranes to increase membrane fluidity, thereby compensating for the lower temperatures prevailing at the greater depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367640
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    Paper (German National Licenses)
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