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  • 11
    Electronic Resource
    Electronic Resource
    Concentration and identification of volatile compounds from heated beef fat using supercritical carbon dioxide extraction-gas liquid chromatography/mass spectrometry (1992)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 40 (1992), S. 1641-1646 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00021a033
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  • 12
    Electronic Resource
    Electronic Resource
    Observations of acoustic streaming fields around an oscillating ultrasonic file (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 8 (1992), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The steady acoustic streaming generated around straight and precurved oscillating ultrasonic files driven by the Piezon-Master 400 unit was examined in the free field and in small channels using a stereomicroscope. In addition, the effect of file-wall contact on streaming production was also investigated. The results indicated that the ultrasonic files can generate acoustic streaming both in the free field and in the small channel. Higher velocity streaming was observed when smaller size files were employed and when the file was precurved. Light file-wall contact did not totally inhibit streaming while severe file-wall contact inhibited movement of the file and, as a result, no streaming was observed. The positions and length scales of the streaming vortices appeared to be influenced by the presence of boundaries. In the free field, two rows of vortices were situated along the sides of the file while in the small channel, the vortices were positioned above the surface of the file. These results indicated that it is possible for acoustic streaming to occur in a confined space as in a root canal provided that severe file-wall contact is avoided. It is therefore recommended that light filing or allowing the file to freely vibrate during some stage of treatment should be carried out in order to generate streaming in the root canal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1992.tb00241.x
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  • 13
    Electronic Resource
    Electronic Resource
    RADIOGRAPHIC AND PATHOLOGIC FEATURES OF OSTEOPETROSIS IN TWO PERUVIAN PASO FOALS (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Veterinary radiology & ultrasound 35 (1994), S. 0 
    Details
    ISSN: 1740-8261
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The radiographic and pathologic findings of two Peruvian Paso foals with osteopetrosis are described. Both foals, one male and one female, presented with respiratory difficulty, brachygnathia and failure to rise after birth. Both foals were mildly anemic, hypogammaglobulinemic and had elevations in serum alkaline phosphatase. Increased medullary bone opacity was noted on radiographs of the extremities, spine and skull in both foals. A lack of normal cortical:medullary bone distinction was evident radiographically. The medullary primary spongiosa appeared to run in parallel columns away from the physes of all long bones and the vertebrae. This created a distinctive hour glass appearance to the osteopetrotic bones. One foal developed a bacterial pneumonia. Both foals were euthanized due to failure to thrive. Histopathology and electron microscopy documented these foals to have normal osteoclastic numbers but lack normal ruffled borders, lack of a clear zone and normal lysosomal numbers indicative of cellular dysfunction. These clinical, radiographic and pathologic findings are similar to the juvenile, lethal autosomal recessive form of osteopetrosis described in humans. Osteopetrosis has not been previously described in a female foal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1740-8261.1994.tb02054.x
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  • 14
    Electronic Resource
    Electronic Resource
    THE FARM LEVEL EFFECTIVENESS OF SELECTED IRRIGATION POLICY MEASURES (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 29 (1993), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The on-farm economic effectiveness of government capital grants, subsidized interest rates, and the Canadian Wheat Board (CWB) delivery quota levels in terms of adoption and/or expansion of irrigation in Saskatchewan is tested. The annualized net income at 5 and 20 years of three representative farm types - a dryland grain farm, an irrigated grain farm, and an irrigated mixed farm - are used in the analysis. Tradeoffs between income levels and the risks associated with adoption/expansion of irrigation are evaluated using mean-standard deviation tradeoff and stochastic dominance. Risk differences arise due to reduced business risk through higher yields and increased financial risk through higher borrowing when adopting or expanding irrigation. Capital grants and subsidized interest rates are effective policy measures for dryland grain farms adopting irrigation because the farms are left in a similar risk position. However, these grants and interest rates are not effective policy measures in the medium run (5 years) for irrigated grain farms expanding irrigation because they lower the farm's risk efficiency. In the long run (20 years), the capital grants and subsidized interest rates need to be combined with open CWB delivery quotas before the risk position can be improved for irrigated grain farms expanding irrigation. Finally, the grants and interest rates need to be combined with increased irrigated hay production for risk efficiency to increase in both the medium and long run (5 and 20 years, respectively) on irrigated mixed farms expanding irrigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1993.tb03198.x
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  • 15
    Electronic Resource
    Electronic Resource
    Supercritical CO2 Extraction of Annatto (Bixa orellana) Pigments and Some Characteristics of the Color Extracts (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 56 (1991), 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
    Notes: Supercritical CO2 (SC-CO2) was used to extract natural food colors from Annatto (Bixa orellana) seeds with different pressures and temperatures. Results from the reverse thin-layer chromatographic separation and GC/MS revealed that SC-CO2 extracts were composed mainly of bixin, geranylgeraniol and norbixin. Differences in absolute values of solubility parameters (SPD) between these main compounds and SC-CO2 indicated bixin was more easily extracted than norbixin under conditions used. A higher yield of total pigments was obtained at extraction pressure above 310 bar than at 210 bar and 50°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1991.tb07980.x
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  • 16
    Electronic Resource
    Electronic Resource
    Relation entre formulation et quelques propriétés mécaniques des bétons à hautes performances (1992)
    Springer
    Materials and structures 25 (1992), S. 464-475 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary This paper studies the relationship between design mix and mechanical properties (compressive strength, modulus of elasticity, endogenous shrinkage) of high-strength concretes of the 50–100 MPa range. The models proposed for each of these properties are based on an analysis of the hardness of concrete considered as a composite material, offering the possibility of tracing the properties of the concrete through to those of the matrix. The properties of the matrix are linked to the two main parameters of the mix (water/cement and silica/cement ratios) by empirical laws obtained by averaging out experimental data. Eleven concretes were made with the same ingredients, by varying separately the design mix parameters, also with the aim of identifying the effect of these parameters on the properties under study. The accuracy of the models proposed has been evaluated from these experimental data and other data drawn from the literature. Since these models form a synthesis of present knowledge of the material, they constitute a valuable contribution to the specification of high-strength concretes.
    Notes: Résumé On s'intéresse dans cette publication aux relations entre composition et propriétés mécaniques (résistance en compression, module élastique, retrait endogène) des bétons à hautes performances (BHP) dans la gamme 50–100 MPa. Les modèles proposés pour chacune de ces propriétés s'appuient sur une analyse du béton durci en tant que matériau composite, permettant de passer des propriétés du béton à celles de sa matrice. Les propriétés de la matrice sont reliées aux deux principaux paramètres de composition (rapports eau/ciment et silice/ciment) par des lois empiriques obtenues par lissage de données expérimentales. Onze bétons ont été fabriqués avec les mêmes composants, en faisant varier séparément les paramètres de composition, afin de mettre en évidence l'influence de ces paramètres sur les propriétés en question. Ces données expérimentales, ainsi que d'autres données tirées de la littérature, ont permis d'évaluer la précision des modèles proposés. Il est montré finalement que ces modèles, synthétisant la connaissance actuelle du matériau, peuvent constituer une aide précieuse à la formulation de BHP définis à partir d'un cahier des charges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472636
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  • 17
    Electronic Resource
    Electronic Resource
    Preparation of metal supported montmorillonite catalyst: A new approach (1990)
    Springer
    Catalysis letters 6 (1990), S. 401-407 
    Details
    ISSN: 1572-879X
    Keywords: Catalyst ; montmorillonite ; clays ; copper metal ; polyol process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new approach for the preparation of metal supported montmorillonite catalyst is reported here for the first time. The polyol process in which ethylene glycol is used as reducing agent was employed for the preparation of uniformly distributed copper metal particles on and within the montmorillonite matrix. A hydroxy copper acetate intercalated form of montmorillonite was refluxed at 195 °C with liquid ethylene glycol for 6 h. The reduction of copper acetate to copper metal was apparent from the red color of the reduced product. An X-ray powder diffraction pattern showed the deposition of copper metal on the external surface of montmorillonite and scanning electron micrographs exhibited uniformly distributed spherical copper metal particles of about 0.5 μm size. This process may also be extended for the preparation of other fine metal particles supported on montmorillonite catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764008
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  • 18
    Electronic Resource
    Electronic Resource
    Sintering and Sintered Properties of W-Mo-Cu-Ni Heavy Alloys (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 8-9 (Jan. 1991), p. 207-216 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.8-9.207.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Conjunction-type standard ML polymorphism (1990)
    Springer
    Higher-order and symbolic computation 3 (1990), S. 381-409 
    Details
    ISSN: 1573-0557
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract It has been long argued that the well known Milner type inference system implemented in the programming language Standard ML is inadequate [4]. The arguments were presented on the basis of intersection-type inference systems [3]. However no algorithm has been developed. The intersection-type inference systems are closed underβ-equality [1] and has been proved undecidable [7]. The paper presents a new type inference system using conjunction-types which extends the notion of intersection-types. The algorithm presented in the author's previous paper [9] is easily adoptable into the Standard ML. In this paper we shall discuss the features of the system and its semantic soundness. Unlike the intersection-type inference systems, the conjunction-type inference system is: 1. decidable 2. semantically sound for all types 3. semantically sound and complete for basic types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01807698
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  • 20
    Electronic Resource
    Electronic Resource
    The growth of crystalline vapor deposited carbon-60 thin films (1993)
    Springer
    Applied physics 56 (1993), S. 185-192 
    Details
    ISSN: 1432-0630
    Keywords: 61.10 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin films (25-2500 Å) of C60 molecules have been deposited on both (001) NaCl and mica substrates at varying temperatures by resistive evaporation. Both electron diffraction and high resolution microscopy have been used to assess the degree of crystallinity, the orientational ordering and the nature of the defects present in these face-centered-cubic films. For NaCl, optimum conditions yielded polycrystalline films with a tendency towards a 〈110〉 orientation, while for mica, extended single crystal films have been fabricated which exhibit a 〈111〉 direction normal to the film surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539472
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