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  • Chemistry  (4,384)
  • Lunar and Planetary Science and Exploration
  • 1980-1984  (4,384)
  • 1
    Electronic Resource
    Electronic Resource
    Interface mechanics of porous titanium implants (1981)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 15 (1981), S. 73-82 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The interfacial shear properties of bone tissue growth into porous coated Ti-6A1-4V femoral implants have been examined as a function of the pore size of the porous surface. Three particle size range powders (297 μm, 420-500 μm, 595-707 μm) were used to fabricate cylindrical implants which were inserted into the femoral medullary canal of dogs for 6 months. Push-out tests on the removed femurs are reported and reveal: (i) that those implants residing in cortical bone exhibited significantly higher shear properties than the equivalent implants in cancellous bone and (ii) that the interfacial shear strength and stiffness decreased with increasing pore diameter within the range 175-325 μm. The extent of bone ingrowth into the surface of the implants was measured using quantitative optical microscopic techniques. This indicated that the percentage of bone which had grown into the surface was inversely proportional to the square root of the pore size and that further the shear properties of the interface were proportional to the extent of bone in-growth.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820150111
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  • 2
    Electronic Resource
    Electronic Resource
    Mixed solvent matrices for fast atom bombardment mass spectrometry of (4,4′-Disubstituted-2,2′-bipyridine) tetracarbonylmetal complexes of molybdenum and tungsten (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1984), S. 294-294 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210190608
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of poly(ethylene oxide) crystallinity by inverse gas chromatography (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 605-611 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Specific retention volumes Vg for acetone, 1-propanol, ethyl acetate, hexane, and tetrahydrofuran were obtained by inverse gas chromatography using poly(ethylene oxide) as stationary phase. Measurements were done at different flow rates, different injected sample amounts, and with three columns of different packing. Retention volumes were measured above and below the melting temperature of the polymer. The shape of the flow diagram and the variation of retention time tr with the sample amount depend on the temperature, flow rate, and the nature of the probe. Moreover, and due to the polymer polarity, the retention volume is a linear function of the column coating. All these factors must be controlled in order to obtain an accurate value of Vg which allows the determination of the crystallinity of the stationary phase. Above Tm, Vg is independent of flow, packing, and amount of the injected sample.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840315
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  • 4
    Electronic Resource
    Electronic Resource
    A 13C NMR study of four lignins in the solid and solution states (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2297-2304 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of four solvent-extracted lignins were subjected to solid-state 13C NMR analysis using the cross polarization-magic angle (CP/MAS) technique. Comparisons are made between the solid-sample spectra and high-field spectra obtained on solutions of these lignins. Specific signals in both the solid-state and solution spectra can be assigned to structural features present in the lignins. Most of the spectral information present in the solution-state spectra are seen by CP/MAS, a technique that shows great promise for the study of lignin in solid samples.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820819
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  • 5
    Electronic Resource
    Electronic Resource
    Azo compounds for free radical crosslinking of polysiloxane stationary phases (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 371-374 
    Details
    ISSN: 0935-6304
    Keywords: Free radical crosslinking ; Capillary gas chromatography ; Azo compounds ; Nonextractable Polysiloxane stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: There has been much effort spent in recent years developing the technology for free radical crosslinking of polysiloxane polymers to prepare capillary columns coated with thermally stable and nonextractable stationary phases. Organic peroxides have been used extensively as the free radical initiators for the in situ polymerization of the stationary phases. However, these peroxides adversely affect the phase polarity and column activity. Seven azo compounds were studied for crosslinking efficiency. Azo compounds can be used as free radical initiators to prepare nonextractable stationary phases without the adverse effects caused by peroxides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060705
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  • 6
    Electronic Resource
    Electronic Resource
    Modeling of three phase reactors: A case of oxydesulfurization of coal (1981)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 27 (1981), S. 937-945 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Mathematical models have been developed for the design of bubble column slurry reactors, wherein the solids take part in the reaction and follow the shrinking core model. The cases of liquid film control, ash diffusion control, and chemical reaction control have been analyzed. Experiments were performed in a 22.2 mm i.d. continuous cocurrent bubble column slurry reactor for the removal of pyritic sulfur by oxidation from aqueous slurries of Upper Freeport, Lower Freeport, Kentucky No. 9, and Pittsburgh seam coals, in the temperature range of 430-480°K at 6.8 MPa total pressure. The theoretical predictions are found to be in good agreement with experimental results.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690270609
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  • 7
    Electronic Resource
    Electronic Resource
    Gas chromatographic determination of the interaction parameter of poly(ethylene oxide)/poly(methyl methacrylate) blends (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 287-290 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Inverse gas chromatography (IGC) has been used to investigate thermodynamic miscibility of a molten poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blend. Toluene, benzene, and chloroform have been employed as probes in pure and mixed stationary phases of these polymers. Experimental measurements have been taken over a narrow range of temperatures because of the high PMMA glass transition temperature as well as the degradation of the PEO. The interaction parameter χ23 determined at 150°C is slightly negative and dependent on the interacting probe, as has been also noted in previous chromatographic studies on polymer-polymer miscibility. The last section is devoted to a model calculation, using Flory's equation of state theory. Different χ23-concentration curves have been simulated, with the interaction energy parameter X23 as an adjustable parameter.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760240410
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  • 8
    Electronic Resource
    Electronic Resource
    Field desorption mass spectrometry of basic peptides. An approach to the sequencing of arginine-containing peptides (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 288-293 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three basic hexapeptides which have two adjacent arginyl residues were studied by field desorption mass spectrometry. At low emitter temperature singly and doubly charged pseudomolecular ions [M + 1]+ and [M + 2]2+ were observed. At higher temperature, these peptides gave a relatively complex fragmentation pattern which can be explained as resulting from preferential cleavages involving the Arg-Arg sequence. A mechanistic interpretation is proposed for this type of fragmentation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200070705
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of field desorption mass spectrometric profiles by quotient weighting (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 535-538 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown that a fast evaluation of field desorption mass spectrometric profiles can be obtained, using quotient spectra and calculation of quotient weight factors. The characteristics of a program developed for this purpose are described and as an example this approach has been applied to detect metabolites in urine samples.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200111008
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Teilchengrößenbestimmung bei Polyvinylchlorid-LaticesVortrag auf dem Internationalen Symposium „Polymer dispersionen“ vom 4. bis 6. September 1978 in Dresden/DDR (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 335-338 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Determination of the particle size in PVC latices at average particle diameters smaller than 40 nm is achieved by ultracentrifugation combined with strioscopic detection. Bimodal distributions having maxima above and below 40 nm can be characterized by ultracentrifugation and separate detection by turbidimetric and strioscopic methods. Ultracentrifugation, electron microscopy, light scattering and turbidimetry provide comparable particle diameters of monomodal latices for corresponding average values.
    Notes: Die Bestimmung der Größe von PVC-Latexteilchen mit mittleren Teilchendurchmessern kleiner 40 nm gelingt durch Ultrazentrifugation mit schlierenoptischer Detektion. Bimodale Latices mit Verteilungsmaxima oberhalb und unterhalb 40 nm können durch Ultrazentrifugation und getrennte Detektion mittels Trübungsmessung und Schlierenoptik charakterisiert werden. Ultrazentrifugation, Elektronenmikroskopie, Lichtstreuung und Trübungsmessung führen bei monomodalen Latices für vergleichbare Mittelwerte zu gleichen mittleren Teilchendurchmessern.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310510
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