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  • 2005-2009  (2)
  • 1950-1954  (2)
  • 1930-1934  (2)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 127 (1931), S. 128-129 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE first requisite of tornado formation is a violent updraught of moist air. In a paper on the nor'-westers in Bengal, which will be published shortly, it is being shown from a large number of weather charts that the nor'wester squalls during the period February to June are due to the ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 7 (1954), S. 0 
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 855-855 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In a previous paper7 a lag in the flowering of the tillers has been noted, and this was suggested to be due to the absence of the stimulus in the growing apices of the tillers. Observation of histological changes in the growing region has now substantiated this assumption. It has been noted that ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 664-664 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] THE mouth-parts hitherto recognised in ticks comprise a hypostome and a pair of cheliceræ, the three together forming what is believed to be the piercing and sucking organ. The actual mouth-opening, however, has never been observed. In the course of my studies upon the anatomy of ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 219-224 
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: In this work, some surface properties of AISI M2 steel were improved by a thermoreactivedeposition process. Gas nitriding was realized on AISI M2 steel at 550°C for 2 h in anammoniac atmosphere and then, titanizing treatment performed on pre-nitrided steel in the powdermixture consisting of ferro-titanium, ammonium chloride and alumina at 1000°C for 1-4 h.Structural characterization of titanium nitride layer formed on the surface of AISI M2 steel wascarried out by using optical microscopy, scanning electron microscopy, electron microprobe and Xraydiffraction (XRD) analysis. The hardness measurements of titanium nitride layer wereconducted under 10 g loads by using Vickers microhardness indenter. Structural analysis studiesshowed that titanium nitride layers formed on the AISI M2 steel samples were smooth, compact andhomogeneous. XRD analysis show that the coating layer formed on the steel samples includes TiN,Fe6Mo7N2, C0.7N0.3Ti, C0.3N0.7Ti and V2N phases. The hardness of titanium nitride layers formed onthe steel samples is between 2040±186 and 2418±291 HV0.01. The thickness of titanium nitridelayer formed on the steel samples ranged from 3.86±0.43 9m to 6.13±0.47 9m, depending ontreatment time
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 213-217 
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Thermo-diffusion coatings containing Nitrogen, Carbon and Niobium (N+C+Nb) onAISI D2 steel have been carried out by an initial tufftriding process followed by saturation withNiobium. The properties of the diffusion layer, namely microstructure, phase composition andmicro-hardness of the Niobium carbonitride layer, have been studied. The influence of treatmenttime of Niobizing on the thickness of the metallized layer and its phase composition has beenstudied. Nitriding treatment was performed at 575°C for 2 h. Then, the Niobizing treatment wasperformed by pack method in the powder mixture consisting of ferro-Niobium, ammonium chlorideand alumina at 1000°C for 1–4 h. The phases formed on the Niobium carbonitride coated steel wereNbN and NbC, confirmed by X-ray diffraction (XRD) analysis. The longer the treatment times, thethicker the Niobium carbonitride layer became. The thickness of Niobium carbonitride layer waschanging between 6.53 3m and 17.45 3m, depending on treatment time and temperature. Themicrohardness of Niobium carbonitride layer formed on the AISI D2 steel was changing between2132±203 and 2814±245 HV0.01 from surface to interior
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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