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  • Articles  (33)
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  • Articles  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Accurate three-dimensional quantum scattering studies of long-lived resonances for the reaction He+H+2→HeH++H (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8085-8097 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adiabatically adjusting principal-axis hyperspherical (APH) formulation of Pack and Parker for quantum reactive scattering in three dimensions (3D) is used to obtain converged results for the reaction of helium with H+2 (v=1–4) for total angular momentum J=0. The ab initio potential energy surface computed by McLaughlin and Thompson and fitted by Joseph and Sathyamurthy is utilized for the HeH+2 interaction potential. The predicted energy dependence of the accurate 3D state-to-state reaction probabilities show clear evidence for quantum resonances. These resonances are even more numerous than those reported earlier for reduced dimensionality studies of this reaction. The calculated time delays for several of these resonances are found to be over 1 ps. Bending corrected rotating linear model (BCRLM) studies of this same reaction are also reported. These results provide useful insight in sorting out the nature and contribution of the resonances found in the 3D studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459339
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  • 2
    Electronic Resource
    Electronic Resource
    Photodissociation of ozone in the Hartley band. Exploratory potential energy surfaces and molecular dynamics (1982)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 862-865 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100395a002
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  • 3
    Electronic Resource
    Electronic Resource
    Reactive Molecular Collisions (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 31 (1980), S. 401-433 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pc.31.100180.002153
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  • 4
    Electronic Resource
    Electronic Resource
    Energy balance of an isolated scots pine (1980)
    Springer
    International journal of biometeorology 24 (1980), S. 293-300 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract The transpiration of an isolated Scots pine (P. sylvestris), determined by weighing, was related to stomatal resistance and environmental factors. The tree had been sheared to 1.5 m diameter at the base and 1.8 m high. The transpiration (2.97 MJ for 12h) was rather constant throughout the day and similar in shape to direct beam radiation incident upon the side of a cone. Transpiration rates calculated with the gradient equation duplicated measured values when vapor density gradients (obtained from measured needle temperature), measured stomatal resistance, and characteristic width of 3 mm in aerodynamic resistance were used in the calculations. Net radiation (Q*) for the tree was calculated by replacing the direct beam component of measured net radiation with the direct beam component incident upon a cone. The sensible heat flux, calculated with needle temperatures, was large (50.8 MJ) and nearly equal to Q* (53.85). The resulting Bowen ratio was 17. Transpiration calculated with a modified Penman-Monteith type equation simulated measured values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02250571
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  • 5
    Electronic Resource
    Electronic Resource
    Forest fertilization research and practice in the Pacific Northwest (1991)
    Springer
    Nutrient cycling in agroecosystems 27 (1991), S. 129-140 
    Details
    ISSN: 1573-0867
    Keywords: Douglas-fir ; nitrogen ; mineral cycling ; growth and yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Forest managers in the Pacific Northwest (PNW) use fertilization as a means to increase timber yields in managed stands. Information on the biological basis for nutrient amendments and stand growth responses to fertilization is required to effectively use fertilization as a silvicultural tool, and research programs in mineral cycling and forest nutrition have been underway in the region for about four decades. Most PNW Douglas-fir forest sites are nitrogen deficient. Mineral cycling research has shown high C/N ratios and low nitrification rates for soils in the region. Research and development projects in the Pacific Northwest have produced an information base that is used to select sites and stands for fertilization and to forecast growth after treatment. Much of the basis for operational fertilization programs in western Oregon and Washington comes from cooperative research programs; current activities for these programs are directed toward improving site-specific response information. Forest fertilization in the Pacific Northwest has become a silvicultural practice of major significance over the past two decades. Forest industry and government organizations managing forest lands in western Oregon and Washington apply nitrogen fertilizer to Douglas-fir stands over a range of soil and stand types (operational fertilization of other species is minor). About 50,000 to 55,000 ha are fertilized each year, and future programs will likely be of similar magnitude. Most current plans for management regimes including fertilization call for multiple applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048615
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  • 6
    Electronic Resource
    Electronic Resource
    Major-element deficiencies inCasuarina equisetifolia (1993)
    Springer
    Nutrient cycling in agroecosystems 34 (1993), S. 127-133 
    Details
    ISSN: 1573-0867
    Keywords: Casuarina equisetifolia ; deficiency symptoms ; filao ; macro-nutrients ; mineral nutrition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Casuarina equisetifolia is being widely used in tropical and sub-tropical countries as a fast-growing multipurpose tree. It is tolerant of relatively infertile sites, especially because of symbiotic N-fixation. However, mineral requirements and deficiencies have been scantily studied, even though responses to fertilization have been reported. To study its mineral nutrition, seedlings ofC. equisetifolia were grown for six months in sand cultures, using a 1/2 strength Hoagland-typeComplete solution, and two reduced levels of N, P, K, Ca, and Mg. Plant heights were measured every 2–3 weeks; at harvest, dry weights of younger and older foliage, stems, and roots were recorded, and chemical analyses made for the elements being studied. Deficiency symptoms were observed, and the chemical analyses confirmed at least incipient deficiency in the reduced level treatments for each of the five elements. This made possible estimation of deficiency ranges, which should be useful in assessing needs for mineral fertilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00750107
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  • 7
    Electronic Resource
    Electronic Resource
    Field studies of pine, spruce and aspen periodically subjected to sulfur gas emissions (1977)
    Springer
    Water, air & soil pollution 8 (1977), S. 105-129 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Field studies of photosynthesis in Pinus contorta/Pinus banksiana (lodgepole pine/jack pine) hybrids, Picea glauca (white spruce) and Populus tremuloides (aspen) subjected to SO2 and H2S from a nearby natural gas processing plant were initiated near Whitecourt, Alberta, Canada during the summer of 1974. The site was characterized as a Pinus-Picea glauca/Arctostaphylos uva-ursi association (pine-white spruce/bearberry). A 15 m high scaffold was used as access to mid-crown foliage in the pines while the spruce and aspen were accessible from the round. Net assimilation rates, transpiration rates and leaf resistances were calculated and water deficits were monitored. Photosynthetic rates measured were in a low range for the conifers studied, with pine having a maximum of 3.28 mg dm−2 h−1 and white spruce a maximum value of 2.3 mg dm−2 h−1 The low maximum photosynthetic rate determined for aspen is thought to be attributable to the onset of autumn. Chemical analyses for SO4-sulfur using the methylene blue colorimetric method of Johnson and Nishita (1952) showed levels of 300 to 700 ppm, with the older foliage showing slightly higher values. Visible chronic S02 symptoms had a pronounced sun, or upward, orientation. Ambient SOD H2S and total S were measured using a Tracor 270HA Atmospheric Sulfur Analyzer (chromatographic method) and trends in ambient SO2 concentrations using an Envirometrics SO2 Analyzer (polarographic method). Concentration was found to be variable for SO2 and generally below 0.05 ppm. A concentration gradient of SO2 was found to exist in the lodgepole pine/jack pine stand with the SO2 values above the canopy generally higher than below the canopy (0.1 ppm above and 0.05 ppm below). This condition was occasionally reversed. The plant canopy is considered to act as a barrier to downward diffusion of the S emissions in the first case and also a barrier to upward diffusion of S emissions present due to advection in the stand in the second case. The vegetative environment surrounding the Windfall Gas Plant is definitely affected by S gas emissions but the extent remains to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156729
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  • 8
    Electronic Resource
    Electronic Resource
    Sulphur gas emissions in the boreal forest: The West Whitecourt case study (1986)
    Springer
    Water, air & soil pollution 29 (1986), S. 129-147 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Net photosynthesis (Phn), leaf resistance, and transpiration of a naturally occurring hybrid of Pinus contorta Loud. and P. banksiana Lamb. (lodgepole pine × jack pine) were measured as part of a case study investigating the chronic exposure of a forest ecosystem to low concentration S gas emissions from a S recovery gas plant in west central Alberta, Canada during 1975 and 1976. The objectives of this portion of the case study were to determine if chronic low concentration exposure to S gas emissions had produced any accumulative effect on the Phn of the pine trees and to determine if ambient SO2 concentrations had any immediate effect on Phn. Sulphur dioxide concentrations above 0.01 ppm occurred on 87% and 71 % of the monitoring days at the intensive experimental site during 1975 and 1976, respectively. The maximum half-hour daylight concentrations of SO2 were 0.21 ppm and 0.12 ppm in 1975 and 1976, respectively. Photosynthetic performance was not affected by controlled SO2 exposures in the laboratory below 0.23 ppm for 30 min, but it was always depressed by exposure to SO2 above 0.25 ppm for 30 min. Ambient concentrations of SO2 in the field had no measurable immediate effect on Phn. However, the seasonal mean rates of Phn of current year (1976) and 1-yr old (1975) pine foliage were significantly lower at the frequently exposed sites than the infrequently exposed site (3.9 and 3.4 mg CO2 g dw−1 h−1 versus 6.4 and 5.1 mg CO2 g dw−1 h−1, respectively). The current year's foliage sampled at the sites infrequently exposed to S gases achieved positive rates of net CO2 exchange one to three weeks earlier than foliage from the three frequently exposed sites. Foliar sulphate-S concentrations, however, were only poorly correlated with Phn rates. The reduced rates of net photosynthesis and shorter period of positive net CO2 exchange in current year's foliage frequently exposed to S gas emissions combined with the shorter needle retention time and foliar chlorosis may partly explain the previously reported lowered productivity of these trees as measured by basal area increment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00208404
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  • 9
    Electronic Resource
    Electronic Resource
    DSC Screening of Potential Prochlorperazine-Excipient Interactions in Preformulation Studies (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1317-1322 
    Details
    ISSN: 1572-8943
    Keywords: cyclodextrins ; drugs ; DSC ; excipients ; prochlorperazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Differential scanning calorimetry was used to examine the thermal behaviour of mixtures of the drug prochlorperazine with standard excipients, to assess potential interactions, and of mixtures with cyclodextrins, to investigate inclusion complexation which could increase the photostability of the drug. For most of the excipients (magnesium stearate, stearic acid, Explotab®, Ac-Di-Sol®, Encompress® and Ludipress®, lactose and Starch 1500) disappearance or broadening of the melting endotherm of the drug indicated interactions. Lubritab® was the only 'inert' excipient tested. Mixtures of prochlorperazine and the cyclodextrins gave incomplete inclusion complexation as shown by only partial disappearance of the melting endotherm of the drug.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010150305542
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  • 10
    Electronic Resource
    Electronic Resource
    Sulphur gas emissions in the boreal forest: The west Whitecourt case study (1981)
    Springer
    Water, air & soil pollution 15 (1981), S. 77-85 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285534
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