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  • 2005-2009  (2)
  • 1965-1969  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural Characterization of Titanium Nitride Coatings on AISI M2 Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 219-224 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.219.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of Niobium Carbonitride Coating on AISI D2 Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 554 (Aug. 2007), p. 213-217 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.213.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulation of the Uptake of Water and Ions by lndolyl-3-acetic acid : its Dependence on Nucleic Acid and Protein Synthesis (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 861-862 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The materials used were disks of potato tuber 5 mm in diameter and the epidermal cells of the lower surface of the leaves of Rhoeo discolor9 which are rich in anthocyanin and thus easy to observe under the high-power lens of a light microscope. These tissues have been used successfully by several ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207861b0
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  • 4
    Electronic Resource
    Electronic Resource
    Specificity of Pigment Formation by Penicillium rubrum Stoll (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 1094-1095 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A close scrutiny of the conventional molecular structure of saccharides used in this study and their effect on pigment production by P. rubrum (Table 1) suggests that the configuration of the saccharide molecules themselves is significant and that only those hexoses and pentoses having a core of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2071094a0
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  • 5
    Electronic Resource
    Electronic Resource
    AnomalousK-conversion coefficient of the 124keV transition in131Cs (1968)
    Springer
    The European physical journal 209 (1968), S. 254-259 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absoluteK-conversion coefficients of the 496 keV-124 keV cascadeγ-rays in131Cs have been determined from angular correlation experiments using a new approach. The value ofα K =0.0100±0.0007 obtained for the 496 keV transition is in excellent agreement with the theory whereas a strong case is presented for the existence of an anomalous nuclear-structure-dependent conversion coefficient for the 124 keV transition. TheK-conversion coefficient for this transition has been measured to be 0.742±0.077 giving a value of 1.25±0.13 for the ratioα K (expet) /α K (theory) . The result is interpreted as being due to the presence of electric monopole,E0, electron transition. A value of 0.26±0.14 has been obtained for theE0/E2 electron conversion ratio and the absolute value of the electric monopole matrix element has been determined to be 0.07±0.02.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380073
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  • 6
    Electronic Resource
    Electronic Resource
    Regulation of Chiasma Frequency in Lilium Microsporocytes in vitro (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 178-179 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Using Ito and Stem's method3 for cuituriiig meiotic cells, I have investigated the significance of meiotic DNA and protein synthesis at zygotene?pachytene in relation to chiasma frequency in the lily variety 'Enchantment Orange . Cultures of microsporocytes treated with AdR, mitomycin C and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224178a0
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  • 7
    Electronic Resource
    Electronic Resource
    Regional metamorphism of pelitic rocks around Kandra, Singhbhum, Bihar (1967)
    Springer
    Contributions to mineralogy and petrology 16 (1967), S. 210-232 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A suite of pelitic rocks around Kandra, Singhbhum District, Bihar, displays a metamorphic gradient registered by the index minerals chlorite, biotite, garnet, staurolite and sillimanite in a Barrovian sequence. Metamorphism was by and large coeval with folding movements, and correlating the internal fabric of minerals and deformational characters, a regular sequence of the index minerals is derived. It is argued that the chronological order by itself is not sufficient to prove that metamorphism was progressive in time. Among the index minerals, garnet appears to have formed by the reaction chlorite+biotitea+quartz ⇌ garnet+biotiteb+H2O. For the origin of sillimanite, a new reaction, 3 staurolite+muscovite+quartz=7 sillimanite+biotite+3H2O, is suggested on the basis of significant textural features. Textural and petrological indications regarding the formation of staurolite are in discordance. Staurolite was either derived from the biotite zone phases, or should be taken to have formed, against textural evidences, from chloritoids of the garnet zone. Graphical analysis of the assemblages by Thompson's ‘AFM’ projection reveals that chlorite and staurolite are excess phases owing to retrogression and incomplete reaction. Shifting of apices of triangular fields and intersection of garnet-biotite tie lines within a zone can be satisfactorily explained in terms of extra components CaO and MnO or their ratios. It is pointed out that if MgO/(MgO + FeO) between two phases show a linear relation, their tie lines will be concurrent on the AF side of the projection, the point of concurrence reflecting equilibrium and temperature of recrystallisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371093
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of thermal neutron irradiation on mitosis (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 335-335 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00631205
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  • 9
    Electronic Resource
    Electronic Resource
    Energy transfer and sensitised luminescence in single crystals of CaF2:(Ce+Mn) system (1967)
    Springer
    The European physical journal 201 (1967), S. 368-377 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurement of absorption, luminescence, and relative intensity of cerium and manganese emission during fluorescence, on single crystals of CaF2:(Ce+Mn), have been reported in this paper. The occurence of the absorption bands have been explained in the following manner: (i) 250 mu band due to the transfer transition from F− to2D, the excited state of Ce3+, (ii) 305 mμ band due to the characteristic transition of Ce3+ and (iii) 335 mμ band due to the perturbed level of the lattice. The emission bands have been explained like this, (i) 320 and 340 mμ bands due to the transitions of2D to2F5/2,7/2 levels of Ce3+ (ii) 380 and 440 mμ bands corresponding to the perturbed levels and (iii) 520 mμ band due to transfer of energy from cerium centres to manganese centres. The results of the present investigation indicate that energy transfer in this system occures not only from cerium to manganese centres but also from cerium to cerium and cerium to perturbed levels of the lattice. It has also been observed that energy transfer process is temperature dependent in this case. An energy level scheme is proposed to explain the transfer mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326570
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  • 10
    Electronic Resource
    Electronic Resource
    Genetical studies inCajanus cajan (L.) Millsp. (1968)
    Springer
    Theoretical and applied genetics 38 (1968), S. 123-125 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung An drei Kreuzungsreihen von Sorten unterschiedlicher Hülsenfarbe (schokoladenbraun, rostrot, grün mit schokoladenbraunen Streifen und grün mit rostroten Streifen) wurde die Vererbung dieses Merkmals bei der Straucherbse (Cajanus cajan (L.) Millsp.) untersucht. Für das Auftreten der schokoladenbraunen Hülsenfarbe ist das GenL verantwortlich,L r, ein bisher unbekanntes Allelomorph vonL, für die rostrote Farbe, während das GenD die Verteilung der Farbe steuert.L ist vollständig dominant überL r undD unvollständig dominant überd. Auf Grund der gemachten Feststellungen werden die Genotypen für die einzelnen Phänotypen angegeben.
    Notes: Summary From three sets of crosses involving the phenotypes chocolate, red oxide, green with chocolate streaks and green with red oxide streaks, the action of the genes governing the phenotypes of the pods ofCajanus cajan (L.) Millsp. has been proposed. GeneL controls production of chocolate colour,L r an allelomorph ofL hitherto unreported, controls production of red oxide colour and geneD controls distribution of this colour. As regards inheritance of these two genes, the relationships betweenL andL r isL〉L r andD is incompletely dominant overd. The genotypes of the different phenotypes have been presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00934202
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