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  • crystal structure
  • evolution
  • oxidation
  • porous silicon
  • Springer  (22)
  • 2000-2004
  • 1980-1984  (22)
  • 1981  (22)
Collection
Keywords
Publisher
Years
  • 2000-2004
  • 1980-1984  (22)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Feedback selection and the evolution of modifiers (1981)
    Springer
    Acta biotheoretica 30 (1981), S. 79-102 
    Details
    ISSN: 1572-8358
    Keywords: evolution ; modifier theory ; dominance evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The problem of modifier evolution was examined with regard to the idea that modifier evolution can be considered as a result of selection for adaptation speed in populations far from equilibrium. This kind of selection was called ‘feedback selection’ in order to emphasize the difference to theories which consider modifier evolution near the equilibrium. The basic principles of this kind of selection are derived for asexual populations and the problem of dominance is discussed in the light of this concept. In general the results support the view, that the genetic properties of a character are selected along with the character itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047674
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  • 2
    Electronic Resource
    Electronic Resource
    Kristallstruktur und Infrarot-Absorptionsspektrum von synthetischem Monohydrocalcit, CaCO3·H2O (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 899-909 
    Details
    ISSN: 1434-4475
    Keywords: Carbonate ; CaCO3·H2O ; crystal structure ; IR spectrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of synthetic monohydrocalcite was solved withPatterson andFourier syntheses and refined for the subcell withá=6.0931 (9) Å,ć=7.5446 (18) Å, space group P3121 or P3221,Z=3 toR w=0.039. Very weak superstructure reflections define a cell with $$a = a' \cdot \sqrt 3 $$ andc=ć, space group P31 or P32,Z=9. The superstructure result from ordering of the CO3 groups and was refined with rigid carbonate groups toR w=0.086. The interpretation of the IR spectrum is in agreement with the results of the X-ray structure analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905061
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  • 3
    Electronic Resource
    Electronic Resource
    Review of oxide formation in a plasma (1981)
    Springer
    Plasma chemistry and plasma processing 1 (1981), S. 217-232 
    Details
    ISSN: 1572-8986
    Keywords: Anodization ; oxidation ; plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The physical processes occurring at the surface and in the bulk of an oxide during plasma oxidation or anodization are discussed. It is shown that (i) the majority of oxygen ions used in the growth are formed by electron-assisted surface processes, (ii) the nature of the oxide surface and especially the presence of electrode contamination can have a determinant role in the oxygen exchange between the plasma and the oxide, and (iii) ion space charge can control the anodization kinetics. Two applications (formation of the insulating barrier of Josephson junctions, and GaAs MOSFET devices) are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568831
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  • 4
    Electronic Resource
    Electronic Resource
    Aldehyde oxidases of Drosophila: Contributions of several enzymes to observed activity patterns (1981)
    Springer
    Biochemical genetics 19 (1981), S. 567-583 
    Details
    ISSN: 1573-4927
    Keywords: aldehyde oxidase ; Drosophila ; evolution ; gene regulation ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract At least four enzymes contribute to histochemically, electrophoretically, or spectrophotometrically detectable aldehyde oxidase (AO) activity in Drosophila melanogaster. The one we designate AO-1 contributes the majority of activity measured in extracts of whole flies. Pyridoxal oxidase (PO) is also a broad range AO. It is prominent only in midgut and Malpighian tubules, where it apparently accounts for a substantial fraction of total AO activity. The tissue distributions of these enzymes are clearly disparate despite close linkage of their structural loci and parallel dependence on the mal, lxd, and cin loci. A similarly related enzyme, xanthine dehydrogenase (XDH), is detected as an AO only in electrophoretic gels. A fourth broad range AO, not dependent on mal, lxd, and cin, is confined to the ejaculatory bulb. A similar array of AO isozymes is present in phylogenetically distant Drosophila species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484627
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidation and hot corrosion of coated and bare oxide dispersion strengthened superalloy MA-755E (1981)
    Springer
    Oxidation of metals 15 (1981), S. 251-276 
    Details
    ISSN: 1573-4889
    Keywords: oxide dispersion strengthening ; oxidation ; hot corrosion ; powder metallurgy ; porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cyclic hot corrosion and oxidation testing of an experimental oxide dispersion strengthened (ODS) superalloy MA-755E were conducted in a hot gas stream at Mach 0.3. The response of the ODS alloy, bare or with protective coatings, was similar to that of a conventional cast alloy, IN-792, in hot corrosion at 900°C. However, during oxidation at 1100 and 1150°C the ODS alloy differed from the cast alloy by developing a greater amount of subsurface porosity. Compared with a diffused aluminide coating, an electron beam vapor deposited NiCrAlY coating offered superior oxidation protection and decreased porosity formation. In additional testing, the tendency to form porosity was associated with the large grains of recrystallized powder metallurgy alloys but was independent of the presence of an oxide dispersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058828
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of the thickness of hematite and magnetite layers on oxidized iron by electron reemission Mössbauer spectroscopy (1981)
    Springer
    Oxidation of metals 15 (1981), S. 323-329 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; iron ; Mössbauer ; conversion electron ; ERM Spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A reanalysis of earlier electron reemission Mössbauer (ERM) data obtained from iron oxidized in pure oxygen at 150 to 500°C is presented. The new data analysis utilized the same theoretical method used previously, but with significantly altered values for the electron attenuation coefficients determined from recent experimental work by Graham, Mitchell, and Channing. The recalculated oxide-thickness values were found to be in much better agreement with the volumetrically measured oxygen uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058832
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  • 7
    Electronic Resource
    Electronic Resource
    The oxidation behavior of Fe-Cr alloys containing HFO2-dispersed phase (1981)
    Springer
    Oxidation of metals 15 (1981), S. 287-295 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; dispersoids ; scale adherence ; ferritic alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The present investigation examines the high-temperature oxidation behavior of Fe-Cr ferritic alloys containing 1.0% Hf which has been convened into an oxide dispersion. The oxide dispersions were produced by an internal oxidation treatment using a 50-50 Cr-Cr2O3 powder mixture in a sealed quartz capsule at 1100°C: the samples were not in direct contact with the powders. The effect of the dispersed oxide was spectacular under isothermal oxidation conditions, but it had almost no effect during thermal cycling conditions. Unlike the TiO2-containing Fe-Cr ferritic alloys, virtually no particle coarsening was observed. The absence of the coarse particles caused poor thermal cycling behavior, whereas in TiO2-containing ferritic alloys, coarse particles acted as oxide pegs giving a keying-on effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058830
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidation properties of Fe-5Cr-4Al (wt.%) alloys in oxygen at temperatures 1000°C–1320°C (1981)
    Springer
    Oxidation of metals 15 (1981), S. 355-373 
    Details
    ISSN: 1573-4889
    Keywords: Fe-Cr-Al alloy ; oxidation ; α-Al2O3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxidation kinetics of a parent Fe-5Cr-4Al alloy subjected to two types of anneals were investigated at temperatures ranging from 1000°C to 1320°C. The alloy annealed at 850°C exhibited a rapid transient oxidation stage associated with growth of nodules containing iron oxides and internal precipitation of α-Al2O3 in the alloy beneath these nodules. The nodules nucleated and grew from sites located in the regions of the alloy grain boundaries during the period of rapid alloy grain growth. Nodular growth virtually ceased when a continuous α-Al2O3 film formed at the nodule-alloy interface. The alloy subjected to anneal at 1000°C and at the reaction temperature to stabilize the alloy grain size tended upon oxidation to form a protective α-Al2O3, layer by parabolic kinetics at temperatures to 1250°C. If this alloy was oxidized in stages at 1000°C, a protective α-Al2O3 scale was formed up to 1320°C. The temperature coefficient of the parabolic oxidation kinetics was consistent with diffusion processes at boundaries of the α-Al2O3 grains playing an essential role during growth of this protective oxide layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058835
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  • 9
    Electronic Resource
    Electronic Resource
    Oxidation of Fe-C alloys in the temperature range 600–850°C (1981)
    Springer
    Oxidation of metals 16 (1981), S. 339-353 
    Details
    ISSN: 1573-4889
    Keywords: Iron-carbon ; oxidation ; decarburization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of Fe-C alloys in the temperature range 600–850°C has been studied. CO 2 evolved during oxidation was measured using an infrared gas analyzer. The presence of C lowers the oxidation rate relative to that of pure Fe and this has been related to the rejection of carbon at the alloy-scale interface causing poor contact between scale and alloy. As a result, the scale contains a higher proportion of magnetite, which reduces its overall growth rate. Very little carbon is lost to the atmosphere. The ease with which the rejected carbon is incorporated into the alloy depends on the alloy structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611348
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  • 10
    Electronic Resource
    Electronic Resource
    Immunogenetic study on the polymorphism of serum α2-lipoproteins in mink. IV. Diallelism at the Ld locus of low-density lipoprotein (1981)
    Springer
    Biochemical genetics 19 (1981), S. 997-1015 
    Details
    ISSN: 1573-4927
    Keywords: allotype ; gene ; low-density lipoprotein ; mink ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Antibodies against a new allotype, Ld2, of mink low-density lipoprotein (LDL) were obtained by alloimmunization with a preparation of this lipoprotein. The two known allotypes of LDL, designated Ld1 and Ld2, are coded for by codominant alleles of the autosomal Ld locus. This locus is probably involved in the genetic control of the whole serum pool of LDL molecules. In Ld 1 /Ld 2 heterozygotes, LDL is represented by two homozygous types of molecules, Ld1 and Ld2; it has no hybrid molecules bearing both allotypic specificities together. The results suggest that the Ld locus has, presumably, only two alleles in the mink populations studied. Mink LDL having allotypes Ld1 and Ld2 was found to be homologous to human and pig LDLs. Antigenic specificity of Ld1 allotype was established in the sera of a wide phylogenetic range of mammals and in the human LDL. The parallelism between the phylogenetic antiquity of the Ld 1 gene and its high frequency in mink and other species may be attributed to the selective value of this gene, which has been retained unaltered during macroevolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504263
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