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  • Wiley-Blackwell  (901)
  • American Meteorological Society (AMS)
  • PANGAEA
  • 1990-1994  (931)
  • 1980-1984
  • 1993  (931)
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  • 1990-1994  (931)
  • 1980-1984
Year
  • 11
    Electronic Resource
    Electronic Resource
    PVD-beschichtete Tribosysteme bei reversierender Gleitbeanspruchung (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 160-167 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: PVD-coated tribosystems at reciprocating slidingThe aim of the investigation is to increase the life time of machinery elements of steel, sliding under high contact pressure, by PVD-coating of one of the surfaces.The three-step tribological testprogram includes a fundamental test, a model test under real conditions and a suitability test with real parts. The coefficient of friction and wear depends on substrate material, deposition variance, coating structure and surrounding conditions.Hard coatings: They enlarge the life time of lubricated systems considerably (μ ≤ 0,1). Without lubrication the coefficient of friction is relatively high (μ ≥ 0,5), which results in a short life time.Coatings with low friction: Soft metals and chalchogenides on supporting hard coatings only reduce the friction for a short time. Metal carbon coatings yield the lowest coefficient of friction (μ = 0.2) and the greatest life time. In the range up to 1500 N/mm2 the pressure has a small influence on the life time. When the coated contact surface slides against an unmachined forged surface, the coating will be damaged after a short time due to local over oad at asperities.
    Notes: Das Ziel der Untersuchungen ist die Steigerung dcr Lebensdauer von unter relativ großen Pressungen gleitend beanspruchten Maschinenelementen aus Stahl durch PVD-Beschichtung eines der Kontaktpartner. Die tribologische Prüfung erfolgt dreistufig durch grundlagennahe Modellprüfung, beanspruchungsähnliche Modellversuche und Versuche am Bauteil (Steckkette) unter Praxisbedingungen. Substratwerkstoffe, Schichtsystem und Umgebungsbedingungen beeinflussen das Reibungs- und Verschleißverhalten wesentlich.Hartstoffschichten: Im geschmierten System verlängern sie die Lebensdauer erheblich (μ ≤ 0,1). Ohne Schmierung ist die Reibungszahl relativ groß (μ ≥ 0,5), was zum frühzeitigen Versagen des Tribosystems führt.Reibungsmindernde Schichten: Weichmetalle und Chalkogenide auf hartstoffbeschichteten Systemen vermindern die trockene Reibung nur kurzzeitig. Die kleinste Reibungszahl (μ = 0,2) und die größte Lebensdauer erbringen die Metall-Kohlenstoff-Schich-ten. Im Bereich bis zu 1500 N/mm2 hat die Pressung nur einen kleinen Einfluß auf die Lebensdauer. Bei Reibung gegen unbearbeitete, geschmiedete Steckkettenelemente wird die Schicht infolge lokaler Überbeanspruchung an Punktkontakten frühzeitig geschädigt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240315
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  • 12
    Electronic Resource
    Electronic Resource
    Grundlegende Betrachtungen zur Eigenspannungsanalyse an Keramik-Metall-Verbunden mittels FEM (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 20-25 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Fundamental Investigations of Residual Stresses in Metal-Ceramic-Joints by FEMThe reduction of damages in metal-ceramic-joints caused by residual stresses is of essential significance. Therefore, a model was created to simulate the behaviour of metal-ceramic-joints under thermal stress. In this paper, results of fundamental investigations are presented.
    Notes: Eigenspannungen in Metall-Keramik-Verbunden führen häufig zu deren vorzeitigem Versagen. Im vorliegenden Beitrag werden Ergebnisse aus Grundlagenuntersuchungen vorgestellt, bei denen der Einfluß wesentlicher Werkstoffkennwerte untersucht sowie ein Vergleich der Rechenergebnisse mit Laboruntersuchungen vorgenommen wurde.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240115
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  • 13
    Electronic Resource
    Electronic Resource
    Stereochemistry of aminolysis of N-pentafluorophenylcarbonimidoyl dichloride. Crystal and molecular structures of N2-pentafluorophenyl-N1,N1-dibenzylchloroformamidine (1993)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 6 (1993), S. 319-325 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been established that the product of the reaction of N-pentafluorophenylcarbonimidoyl dichloride (1) with dibenzylamine, viz. N2-pentafluorophenyl-N1,N1-dibenzylchloroformamidine (4a) is a Z-isomer, whereas according to the concept of stereoelectronic control one might have expected a product with E-configuration. The heat of formation and the geometry of Z- and E isomer of N2-pentafluorophenyl-N1,N1-diethylchloroformamidine (4b) (the latter is a product of the reaction of 1 with diethylamine) were calculated with the semi-empirical MNDO method. The calculated geometry of (Z)-4b was found to be in a good agreement with the experimentally determined structure of 4a. The formation of (Z)-4b is more preferable energetically than that of (E)-4b; the calculated difference in the heats of formation is 2·8 kcal mol-1. Thermodynamic control of the reaction stereochemistry is proposed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610060602
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  • 14
    Electronic Resource
    Electronic Resource
    Investigation of some steroids by means of thermospray and tandem mass spectrometryPaper delivered at the 11th Informal Meeting on Mass Spectromeetry, Budapest, 1993. (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 673-675 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The detection limits of a number of steroids have been determined by means of loop-injection thermospray (TS) mass spectrometry. The measured limits were found to be in the range 1 pg-1O ng/μL. Combined positive-ion TS/tandem mass spectrometry yielded clear qualitative differences between mass selected protonatcd testosterone and estriol ions, both of which have the same nominal molecular weight. These differences are necessary for the correct identification of either species which may be present within a complex mixture. The heights of the peaks due to the two competing reaction channels, [M + H]+ and [M + NH4]+, were monitored as a function of the repeller voltage in the range 100-350 V, and the implications of the acquired data are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070725
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  • 15
    Electronic Resource
    Electronic Resource
    Effect of thermal treatment on heating characteristics of Ni—Cu alloy for hyperthermia: Preliminary studies (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 4 (1993), S. 55-60 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Ferromagnetic Ni—Cu alloy wires were characterized in order to obtain well-defined thermoseeds for application in interstitial hyperthermia of prostate cancer. Thermoseeds have been produced which possess Curie points in the therapeutic hyperthermia range, approximately 40 to 50 °C. The effect of thermal treatment and composition on the heating characteristics of the thermoseeds were investigated. The preliminary study shows that the recrystallization is crucial for altering thermoseeds' heating characteristics. Obtaining thermoseeds which behave as desired depends on changes in annealing times and temperatures. One may increase the maximum heating temperature (similar to Curie temperature) by increasing the annealing time and cooling time. Decreasing the lower annealing plateau temperature also increases the maximum seed heating temperature. Higher nickel content compositions did not affect rise time but increased the maximum heating temperature. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770040107
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  • 16
    Electronic Resource
    Electronic Resource
    Cell culture supports for slam-frozen and molecular distillation dried procedures (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 26 (1993), S. 184-185 
    Details
    ISSN: 1059-910X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1070260215
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  • 17
    Electronic Resource
    Electronic Resource
    Enlarging the stability domain for ion trap tandem mass spectrometry (MS/MS) (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 215-218 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The low- mass cut-off in ion trap tandem mass spectrometry (MS/MS) is significantly improved by employing a sawtooth driving function on the ring electrode in place of the usual sinusoidal AC potential. The theory is explained with examples involving both the ‘tickle’ and ‘boundary-effect’ MS/MS methods.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070310
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  • 18
    Electronic Resource
    Electronic Resource
    Determination of an acetylcholinesterase inhibitor, MDL 73745, in dog plasma and urine by combined gas chromatography/negative ion chemical ionization mass spectrometry (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 377-382 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A highly sensitive and specific assay has been developed for the determination of MDL 73745 [2,2,2-trifluoro-1-(3-trimethylsilyl-phenyl)ethanone] (I) and the internal standard (MDL 74398) at the nanomolar level in dog plasma and urine by gas chromatography/mass spectrometry. After a single-step extraction process, an aliquot was directly injected onto the gas chromatograph column. The mass spectrometer was run in the negative ion chemical ionization mode with ammonia as reagent gas, and was set to monitor the abundant M-· ion at m/z 246 of both compounds. The method yielded a linear response over the concentration range 0.1-10 pmol 100 μl-1 plasma or urine. Within-day reproducibility at a concentration of 0.25, 1 and 5 pmol 100 μl-1 plasma was 8.6%, 1.0% and 1.0%, respectively. The method was applied to the determination of I in plasma and urine after administration of 1 mg kg-1 i.v. and 10 mg kg-1 p.o. to dogs.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200220703
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  • 19
    Electronic Resource
    Electronic Resource
    Analysis of lipid peroxidation mechanisms in human spermatozoa (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 35 (1993), S. 302-315 
    Details
    ISSN: 1040-452X
    Keywords: Lipid peroxidation ; Reactive oxygen species ; Spermatozoa ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The mechanisms by which ferrous ion promoters induce malondialdehyde generation by human spermatozoa have been investigated in order to provide a rational basis for the quantification and interpretation of lipid peroxidation assays. Incubation of human spermatozoa with a ferrous ion promoter in the presence of thiobarbituric acid (TBA) led to the generation of the bone fide malondialdehyde-TBA adduct. The importance of iron in the stimulation of lipid peroxidation was emphasized by the ability of Desferal* and EDTA to suppress malondialdehyde generation. Paradoxically, when the concentration of EDTA relative to iron was equimolar or greater, the suppression of malondialdehyde formation was accompanied by the generation of hydroxyl radicals. These results suggested that the addition of promoter did not effect the first-chain initiation of lipid peroxidation but favored an alternative mechanism involving the catalytic decomposition of pre-existing lipid peroxides. This conclusion was reinforced by the inability of reagents that would limit the formation (superoxide dismutase and/or catalase) or availability (mannitol, formate) of hydroxyl radicals, to influence malondialdehyde generation. While hydroxyl radicals were not directly involved in Fe2+-promoted malondialdehyde generation, the existence of significant correlations between reactive oxygen species production and the outcome of the TBA assay, suggested that Fenton chemistry might be important in the initiation of peroxidative damage. It is proposed that the impeded propagation of peroxidation initiated by Fenton or Haber Weiss reactions would lead to the accumulation of lipid peroxides in the spermatozoa and it is these peroxides that are induced to decompose during the Fe2+-promoted TBA assay, stimulating a lipoperoxidative chain reaction and malondialdehyde formation. © 1993 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080350313
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  • 20
    Electronic Resource
    Electronic Resource
    Laser-induced deposition of aluminium on gallium arsenide from trimethylamine alane (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 2 (1993), S. 53-61 
    Details
    ISSN: 1057-9257
    Keywords: Laser chemical vapour deposition ; Al deposition ; Photolysis ; Pyrolysis ; Trimethylamine alane ; Laser direct writing ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Aluminium microstructures (dots or strips) have been photodeposited on GaAs substrates via the decomposition of a solid precursor, the 2:1 hydride adduct of Al, called trimethylamine alane (TMAA).The dissociation of TMAA, the vapour pressure of which can be varied between 0.4 and 1 mbar by dilution in hydrogen carrier gas, has been achieved via a pyrolytic process using a CW Ar+ laser operating in the visible range (488-514 nm). This decomposition reaction occurs at laser powers higher than 0.3 W, i.e. at laser-induced temperatures higher than 130°C, and leads to the formation of high-purity aluminium strips as observed from Auger electron spectroscopy (AES) and energy-dispersive X-ray analysis (EDX) data. The deposition rates are in the range 50-1400 Å s-1. The minimum of line resistivity measured versus scanning speed and laser power is 6.5 μΩ cm.The photolytic decomposition of TMAA has been performed at room temperature within the laser spot area using a CW UV laser (intracavity frequency doubler emitting at 257 nm). The formation of aluminium clusters has been observed at very low deposition rates (20 Å s-1). However, these tiny clusters react quickly with oxygen and are transformed into alumina clusters.All these results have been tentatively explained on the basis of the surface reactivity of H2 and TMAA regarding GaAs or Al, as obtained by other workers through surface science techniques and mass spectrometry.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860020107
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