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  • 1
    Electronic Resource
    Electronic Resource
    Streaming instability in the grain charge fluctuations (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 457-460 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly charged massive dust grains present in a dusty plasma may exhibit charge fluctuations in response to certain types of oscillations incorporated in the plasma. In this situation the grain charge becomes a time-dependent and self-consistent dynamic variable. The consequent modifications in the collective properties of a dusty plasma in response to longitudinal space-charge waves are investigated. It is shown this new effect gives rise to purely damped modes, in addition to causing a collisionless damping of the normal modes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871897
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  • 2
    Electronic Resource
    Electronic Resource
    Morphological and molecular characterization of Frankia sp. isolates from nodules of Alnus nepalensis Don (1994)
    Springer
    Archives of microbiology 161 (1994), S. 152-155 
    Details
    ISSN: 1432-072X
    Keywords: Frankia sp. ; Alnus nepalensis ; SEM ; PCR ; Nucleotide sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nodules collected from Alnus nepalensis growing in mixed forest stands at three different sites around Shillong, were crushed in various culture media to obtain isolates of Frankia. The isolates were found to have typical Frankia morphology as revealed by the scanning electron microscope. Seedlings inoculated with isolates or crushed nodules formed nitrogen fixing nodules. Frankia specific DNA probes amplified the DNA of the tested isolate AnpUS4. Partial nucleotide sequence of the 16S rRNA gene indicated that AnpUS4 was phylogenetically distinct from all other Frankia strains characterized so far.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276476
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological and molecular characterization of Frankia sp. isolates from nodules of Alnus nepalensis Don. (1994)
    Springer
    Archives of microbiology 161 (1994), S. 152-155 
    Details
    ISSN: 1432-072X
    Keywords: Key words:Frankia sp. –Alnus nepalensis– SEM – PCR – Nucleotide sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Nodules collected from Alnus nepalensis growing in mixed forest stands at three different sites around Shillong, were crushed in various culture media to obtain isolates of Frankia. The isolates were found to have typical Frankia morphology as revealed by the scanning electron microscope. Seedlings inoculated with isolates or crushed nodules formed nitrogen fixing nodules. Frankia specific DNA probes amplified the DNA of the tested isolate AnpUS4. Partial nucleotide sequence of the 16S rRNA gene indicated that AnpUS4 was phylogenetically distinct from all other Frankia strains characterized so far.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276476
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of genome combinations on stability of yield and yield components in wheats and triticales (1987)
    Springer
    Theoretical and applied genetics 73 (1987), S. 899-902 
    Details
    ISSN: 1432-2242
    Keywords: Stability ; Genome combinations ; Wheat ; Triticale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The data on number of grains/spike, 100 grain weight and grain yield/plant in eighteen genotypes of four genome combinations (AABB- 4 genotypes, AABBDD- 6 genotypes, AABBRR- 5 genotypes and AABBDDRR- 3 genotypes) were recorded for eight environments created by combining two dates of sowing, two fertilizer regimes and two spacings. Two stability parameters-regression coefficient (b) and deviation from regression (Sd 2) were computed. Joint regression analyses revealed that the genotypes differed significantly for these characters. A significant variation due to environments was also found. A comparative study of performance of genotypes belonging to four genome combinations revealed that the genes for stability are not uniformly distributed in these genome combinations. Stability may largely depend on gene combination rather than on genome combination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289396
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  • 5
    Electronic Resource
    Electronic Resource
    The influence of satellite flexibility on orbital motion (1978)
    Springer
    Celestial mechanics and dynamical astronomy 17 (1978), S. 145-165 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The orbital perturbations induced by the librational motion and flexural oscillations are studied for satellites having large flexible appendages. Using a Lagrangian procedure, the equations for coupled motion are derived for a satellite having an arbitrary number of appendages in the nominal orbital plane and two flexible members normal to it. The formulation enables one to study the influence of flexibility on both the orbital and attitude motions. The orbital coordinates are expanded as perturbation series in ε=(l/a 0)2,l anda 0 being a characteristic length of the satellite and unperturbed semi-major axis of the orbit, respectively. The first order perturbation equations are solved in terms of elastic deformations and librational angles using the WKBJ method in conjunction with the variation of parameter technique. Existence of secular perturbations is noted for certain librational flexural motions. Three specific examples, Alouette II, Radio Astronomy Explorer and Tethered Orbiting Interferometer, are considered subsequently and their possible secular drifts estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01371327
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of SO2 and SO3 on the Na2SO4 induced corrosion of nickel (1984)
    Springer
    Oxidation of metals 22 (1984), S. 1-33 
    Details
    ISSN: 1573-4889
    Keywords: nickel ; sodium sulfate ; hot corrosion ; sulfurous gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of SO2 and SO3 in the environment on the hot corrosion behavior of Ni in the temperature range 750–950°C has been studied. Below the melting point of Na2SO4 (884°C), rapid corrosion takes place by formation of a Na2SO4-NiSO4 melt, which can penetrate the porous oxide scale and give rise to sulfide information by coming in contact with the metal. The distribution of the sulfides depends on the SO2 level in the ambient gas. Continued corrosion occurs by a sulfidation-oxidation mechanism. At temperatures above the melting point of Na2SO4, accelerated degradation occurs via dissolution of the surface scale, followed by reprecipitation of the oxide in a nonprotective form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659246
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  • 7
    Electronic Resource
    Electronic Resource
    Rapid microdetermination of silicon in rice plant (1975)
    Springer
    Plant and soil 42 (1975), S. 491-494 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A direct method of estimation of silica in rice plant tissues is reported. This involves the digestion of finely ground plant samples with concentrated nitric acid in corning-glass conical flasks followed by dissolution in Na2CO3 in stainless-steel beakers; the plant silica is thereby converted into molybdenum reactive form which is estimated colorimetrically. This method represents an improvement over the time consuming fusion procedure followed ordinarily and also dispenses with use of platinumware. re]19740501
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010025
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluation of silica-supplying power of soils for growing rice (1977)
    Springer
    Plant and soil 47 (1977), S. 487-494 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Laboratory incubation and pot culture experiments conducted with five laterite, two red, two alluvial and one calcareous black, rice-growing soils showed that the power of extraction of silica both from dry and wet soils was in the descending order 0.2 N HCl, 0.025 M citric acid, N NaOAc at pH 4 and distilled water. Flooding increased the silica extracted by these four extractants which reached a peak in 20 days after which there was either no change or a slight decrease during the next forty days. The silica content and uptake in the crop was low in all except the black soil. The silica content of the dry-season crop was higher than that of the wet-season crop possibly because of more favourable climatic conditions prevailing during dry season which enhanced absorption. Correlation studies between silica extracted by different solutions both in dry and flooded soils and content and uptake of silica by the rice plant indicated that 0.025 M citric acid was the best extractant which could be used in the evaluation of the silicon supplying power of rice soils. re]19761012
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011505
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  • 9
    Electronic Resource
    Electronic Resource
    Thermochemical analysis of chemical processes relevant to the stability and processing of SiC-reinforced Si3N4 composites (1991)
    Springer
    Journal of materials science 26 (1991), S. 6591-6598 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Chemical processes relevant to the stability and processing of SiC-reinforced Si3N4 composites are examined from a thermochemical point of view. The thermodynamic stability of various interfaces, such as SiC-Si3N4, SiC-Si3N4-Si2ON2, and SiC-Si3N4-SiO2, is examined as a function of temperature. The temperatures above which these interfaces become unstable are calculated, and the degradation of SiC during the processing of the composite is examined. The processing routes considered in this study include the reaction-bonded silicon nitride process, as well as pressure-assisted sintering processes in the presence of suitable sintering additives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402650
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  • 10
    Electronic Resource
    Electronic Resource
    Thermochemical analysis of chemical processes relevant to the stability and processing of SiC-reinforced Si3N4 composites (1991)
    Springer
    Journal of materials science 26 (1991), S. 6591-6598 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Chemical processes relevant to the stability and processing of SiC-reinforced Si3N4 composites are examined from a thermochemical point of view. The thermodynamic stability of various interfaces, such as SiC-Si3N4, SiC-Si3N4-Si2ON2, and SiC-Si3N4-SiO2, is examined as a function of temperature. The temperatures above which these interfaces become unstable are calculated, and the degradation of SiC during the processing of the composite is examined. The processing routes considered in this study include the reaction-bonded silicon nitride process, as well as pressure-assisted sintering processes in the presence of suitable sintering additives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553682
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