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  • 1990-1994  (11)
  • 1970-1974
  • 1992  (11)
  • 1
    Electronic Resource
    Electronic Resource
    DETERMINATION OF BEST TIMING FOR POULTRY WASTE DISPOSAL: A MODELING APPROACH (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 28 (1992), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Confined production of poultry results in significant volumes of waste material which are typically disposed of by land application. Concerns over the potential environmental impacts of poultry waste disposal have resulted in ongoing efforts to develop management practices which maintain high quality of water downstream of disposal areas. The timing of application to minimize waste constituent losses is a management practice with the potential to ensure high quality of streams, rivers, and lakes downstream of receiving areas. This paper describes the development and application of a method to identify which time of year is best, from the standpoint of surface water quality, for land application of poultry waste. The procedure consists of using a mathematical simulation model to estimate average nitrogen and phosphorus losses resulting from different application timings, and then identifying the timings which minimize losses of these nutrients. The procedure was applied to three locations in Arkansas, and three different criteria for optimality of application timing were investigated. One criterion was oriented strictly to water quality, one was oriented only to crop production, and the last was a combination. The criteria resulted in different windows of time being identified as optimal. Optimal windows also varied with location of the receiving area. The results indicate that it is possible to land-apply poultry waste at times which both minimize nutrient losses and maximize crop yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1992.tb03170.x
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  • 2
    Electronic Resource
    Electronic Resource
    The olive on end in hypertrophic pyloric stenosis (1992)
    Springer
    Pediatric radiology 22 (1992), S. 608-609 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02015369
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  • 3
    Electronic Resource
    Electronic Resource
    The olive on end: A useful variant of the “shoulder” sign in the barium X-ray diagnosis of idiopathic hypertrophic pyloric stenosis (1992)
    Springer
    Pediatric radiology 22 (1992), S. 275-276 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe a radiographic sign of infantile hypertrophic pyloric stenosis. This sign, elicited during firm compression of the barium-coated pyloric region, is a round or ovoid filling defect caused by the hypertrophied pyloric muscle protrudingen face into the gastric lumen. This filling defect typically reveals a barium-containing central depression or stellate indentation, representing the proximal end of the obstructed pyloric channel. This sign, like the closely related “shoulder sign”, appears to establish the diagnosis of hypertrophic pyloric stenosis without need for filling of the pyloric channel or for additional radiographic maneuvers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02019857
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  • 4
    Electronic Resource
    Electronic Resource
    A vascular conducting strand in the early land plant Cooksonia (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 683-685 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The specimens come from the same stream section through Lower Old Red Sandstone fluviatile sediments on Brown Clee Hill, Shropshire, that have yielded the well preseved C. pertoni2-3. Spore assemblages indicate a Gedinnian age (middle micrornatus-newportensis miospore assemblage subzone)5. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/357683a0
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  • 5
    Electronic Resource
    Electronic Resource
    Blast wave measurements close to explosive charges (1992)
    Springer
    Shock waves 2 (1992), S. 237-243 
    Details
    ISSN: 1432-2153
    Keywords: Blast wave ; Explosive ; Hopkinson bar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The paper reports the results of experimental measurements of the reflection pressures close to spherical charges of TNT. These measurements were made using a pressure bar technique. Charge weights of up to 3.6 kg were used, with the reflecting plane in the range 25 to 300 mm from the charge surface. A possible wave interaction model is discussed, to account for the observed pressure profiles, and its qualitative correctness checked by means of numerical simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414759
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  • 6
    Electronic Resource
    Electronic Resource
    Lectures on the properties of liquid and Solid 3He-4He mixtures at low temperatures (1992)
    Springer
    Journal of low temperature physics 87 (1992), S. 473-523 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We give a concise review of the empirical properties of liquid and solid 3He-4He mixtures and their phenomenological interpretation. The bulk of the paper is about dilute solutions of 3He in liquid 4He at temperatures well below the tricritical point, where the roton and phonon excitations are comparatively unimportant. We describe the thermodynamic properties in terms of the Landau-Pomeranchuk 3He quasiparticles and the effective interaction between them, introduced by Emery and Bardeen, Baym and Pines. The scattering amplitude, needed to fit the low temperature transport properties, and the effective interaction are related, provided the multiple virtual scattering calculated by Fu and Pethick is included. The multiple scattering should always be included, even for very small concentrations. We present the evidence for the velocity dependence of the effective interaction, and urge that this also be taken into account in the interpretation of experiments. We give a short description of spin-polarized liquid mixtures and of the possibility of pairing superfluidity in solutions of 3He in liquid 4He. The existence of supersaturated solutions may be a way to attain p-wave pairing at accessible temperatures. Beacause of phase separation, the concentration of 4He in dilute mixtures of 4He in liquid 3He becomes very small as the temperature is lowered, making it unlikely that a degenerate Bose gas of 4He quasiparticles can be produced. In addition, the superfluid 4He film on the walls of the vessel makes the achievement of a supersaturated solution very difficult. We briefly review the measurements of the phase separation, the density and specific heat, and show that the spectrum of the 4He quasiparticles and the role of their effective interactions are still in doubt. In solid 3He-4He mixtures the thermodynamic properties and the phase diagram, including the crystallographic transformation, fit the regular solution model very well. On the other hand, dilute solid solutions of either 3He or 4He in the other isotope have NMR relaxation times and spin diffusion which agree with the theory of impuritons (mass fluctuation waves) which tunnel more or less freely through the crystal. The reconciliation of these two theories and an explanation of the accuracy of the regular solution model remain mysteries. A deviation from the regular solution model, the fluctuation specific heat above the phase separation temperature, is discussed in detail. The review includes two tables which list most of the experiments on liquid and solid 3He-4He mixtures published between 1975 and 1990.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114915
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  • 7
    Electronic Resource
    Electronic Resource
    The solubility of4He in3He below 0.1 K (1992)
    Springer
    Journal of low temperature physics 89 (1992), S. 473-476 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Zharkov-Silin Fermi Liquid theory of solutions of4He in non-superfluid liquid3He has been applied to the recent phase separation data of Nakamura et al. At zero pressure, the difference in binding between a4He atom in liquid4He and in liquid3He is smaller than previous estimates, and the4He effective mass is close to the bare mass. The volume measurements of Laheurte show that the difference in binding has a minimum near ∼11 atm. This implies an enhanced solubility of4He in3He below 0.1 K at this pressure, although there is experimental evidence that the solubility at 0 K remains zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694066
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  • 8
    Electronic Resource
    Electronic Resource
    The Fermi Liquid theory of4He in3He (1992)
    Springer
    Journal of low temperature physics 89 (1992), S. 831-857 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Zharkov-Silin Fermi Liquid theory of solutions of4He in normal (non-superfluid) liquid3He is reviewed and slightly extended. The theory is expected to be valid only below ∼0.1 K, and it predicts that there should be a hundred-fold increase in the diffusion coefficient as the temperature is lowered into this region. The limited range of validity explains the apparent disagreement between the recent very low temperature measurements of the phase separation line by Nakamura et al. and extrapolations from higher temperatures. In the low temperature experiments the4He concentration X4 is so small that there is no macroscopic phase separation, only a gradual thickening of the4He-rich film on the walls. We confirm that the phase separation temperature Tps(X4) estimated from the thickening is close to the values which would be observed in an ideal experiment with a macroscopic phase. Fits to Tps(X4) including the new data show that the4He effective mass m 4 * is close to, and may be equal to, the bare mass m4. The difference in binding at zero pressure between4He in liquid4He and in liquid3He is (E44−EE43)/kB=(0.21+0.03/−0.01)) K. Using the volume measurements of Laheurte to calculate the pressure dependence of E43 indicates that the difference in binding has a minimum of (0.0±0.2) K near ∼11 atm. This implies that the solubility of4He in3He is enhanced in this region of pressure. The behavior of the spinodal line at low temperature, and the possibility of observing Bose condensation in a metastable solution of4He in liquid3He are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683889
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of calcium and aluminium on nodulation, nitrogen fixation and growth of groundnut in solution culture (1992)
    Springer
    Plant and soil 144 (1992), S. 273-279 
    Details
    ISSN: 1573-5036
    Keywords: aluminium toxicity ; Arachis hypogaea L. ; Bradyrhizobium ; calcium ; magnesium ; solution culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract While considerable information has been presented recently on the alleviating effects of calcium (Ca) on aluminium (Al) toxicity, the interaction between Ca and Al on nodulation and N2-fixation of legumes is little understood. A 28 d solution culture experiment using groundnut (Arachis hypogaea L.) cv. Matjam was conducted to evaluate the effects of four Ca concentrations and four Al levels on nodule development, N2-fixation and plant growth. The Ca concentrations were maintained at 500, 1000, 2500 or 5000 μM, and the sum of activities of monomeric Al species (ΣaAlmono) were 0, 15, 30 and 60 μM. With ΣaAlmono≥30 μM in solution, the time to appearance of the first nodule increased, and, with 60 μM ΣaAlmono in solution, plants remained chlorotic throughout the experiment. Activities≥30 μM reduced nodule number and nodule dry mass per plant, particularly with high (5000 μM) Ca in solution. Also, plant top growth was decreased at ΣaAlmono≥30 μM; the effect only being alleviated by 1000 μM Ca at 30 μM ΣaAlmono. The Ca concentration in the youngest expanded leaf (YEL) increased with increased Ca concentration in solution, but was little affected by Al treatment. Nitrogen concentrations mirrored treatment effects on nodule number and nodule dry mass; Al in solution decreased the N concentration particularly with 5000 μM Ca in solution. Furthermore, increased Ca and Al in solution decreased the Mg concentration in the YEL. This suggested that the absence of any alleviating effect of Ca and Al toxicity (indeed the opposite effect was often observed) resulted from interference in Mg nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012885
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  • 10
    Electronic Resource
    Electronic Resource
    Mass spectrometric techniques for structure and novelty determination of kirromycin-like antibiotics (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 51-59 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Direct liquid introduction negative ion mass spectra have been studied for some kirromycin class antibiotics. A scheme for the interpretation of the mass spectral fragmentation patterns is presented and shown to be useful for structure elucidation and novelty determination. Since these spectra are obtained by liquid chromatography/mass spectrometry, antibiotic isolates need not be highly purified. However, where pure preparations are available confirmation of molecular weight assignments may be obtained with fast atom bombardment ionization.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200210110
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