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  • 1
    Digitale Medien
    Digitale Medien
    Dynamics of laser-driven shock waves in water (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5194-5197 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Shock waves were produced in water by directing unfocused 0.4-J, 20-ns ruby (λ=0.693 μm) or 3-J, 8-ns Nd-glass (λ=1.06 μm) laser light onto the metalized surface of a thin plastic foil. The illuminated areas were 0.35 and 2.3 cm2, respectively, corresponding to laser irradiances of 52.6 and 68.4 MW cm−2. The radial propagation velocity and the profile of the generated waves have been measured via double-exposure interferometric holography and shadowgraphy. Using the obtained values of the shock velocities and the fringe shift in the interferograms, the pressure on the shock wave front, the thickness of the compressed water layer, the laser energy consumed in producing this layer, and the time required for its formation have been calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343755
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  • 2
    Digitale Medien
    Digitale Medien
    Whistler instability in a magnetic trap (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 281-283 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The eigenvalue problem of whistler propagation in a magnetic trap is analyzed in the slab model. The plasma is comprised of three regions: (I) a≤x〈∞, (II) 0≤x≤a, and (III) −∞〈x≤0. Region II contains a hot-electron component and possesses a smaller magnetic field. The hot electrons have a temperature anisotropy and tend to destabilize the whistler mode. The dip in the magnetic field tends to confine the mode to region II.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336828
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  • 3
    Digitale Medien
    Digitale Medien
    Hydrodynamics of laser-produced shock waves in water: Reflection and transmission measurements (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1660-1665 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Using different optical diagnostic methods, namely interferometric holography and shadowgraphy, and utilizing a piezoelectric transducer for precise velocity determination, the laws of reflection and transmission of laser-driven shock waves through an obstacle in water are studied. Experimental results on the velocity of transmitted and reflected shock waves from different materials are reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347210
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of Phosphorus Deficiency on Carbohydrate Metabolism of Mentha arvensis (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 21 (1968), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The effects of phosphorus deficiency on carbohydrate fractions of Mentha arvensis L. var. piperascens were studied. Mint plants were grown in sand cultures under full nutrition and phosphorus deficiency conditions. Component organs, viz., leaf, stem and root, were sampled at four different stages of the growth cycle and analysed for various sugar fractions.In leaf and root phosphorus deficiency brought about a definite increase in all sugar fractions whereas in stem a reduction was noticed. The stem appeared to be the principal storage organ throughout the growth. Maximum sugar concentration was recorded at the age of 70 days, which represents the full maturity stage, and coincided with maximum essential oil accumulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1968.tb07368.x
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  • 5
    Digitale Medien
    Digitale Medien
    Nitrogen and Carbohydrate Metabolism of Japanese Mint as Affected by Phosphorus Deficiency and Seasonal Variations (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 24 (1971), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The paper presents effects of phosphorus deficiency and seasonal variations on nitrogen and carbohydrate metabolism of Japanese mint (Mentha arvensis L. var. piperascens, Holmes). Mint plants were grown in sand cultures under full nutrition and under phosphorus deficiency conditions during winter and summer. Various nitrogen and sugar fractions were determined in the component parts at specified periods of growth stages. Phosphorus deficiency disturbed the nitrogen metabolism at the stages for amide and amino acid formation, which resulted in an accumulation of carbohydrates. The content of total soluble and total nitrogen was higher and that of insoluble nitrogen was lower in summer as compared with winter plants. Of the soluble fractions, the ammonia, amide and nitrate nitrogen were higher and the ‘rest’ nitrogen lower in winter plants. Nitrate formed the highest bulk of the pool of soluble nitrogen in winter, whereas in summer ‘rest’ nitrogen was most abundant. The content of total sugar in winter plants far exceeded that of summer plants, which was wholly due to increase in sucrose content. Glucose was the predominant reducing sugar in both seasons. However, the summer plants were richer in glucose than those from the winter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1971.tb06729.x
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  • 6
    Digitale Medien
    Digitale Medien
    Inheritance of spontaneous male sterility in peas (1995)
    Springer
    Theoretical and applied genetics 90 (1995), S. 63-64 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Peas ; Pisum sativum ; Male sterility ; Inheritance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A plant with a mutant phenotype was observed in a ‘Longittee’ cultivar. The plant was late in maturity, had white-translucent anthers, and was male sterile. The inheritance of this mutant was studied in a cross involving the mutant and the mother parent and their F1, F2, F3 and BC1F1 generations. The results suggested that the sterile character was genetic and due to a recessive gene.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00220996
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  • 7
    Digitale Medien
    Digitale Medien
    Inheritance of spontaneous male sterility in pigeonpea (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 1102-1103 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words Pigeonpea ; Cajanus cajan ; Male sterility ; Inheritance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  A male-sterile plant was observed in the UPAS-120 cultivar of pigeonpea (Cajanus cajan). The plant was about 5–7 days late-flowering and had white translucent anthers with complete pollen sterility. The inheritance of this spontaneous male sterility was studied in a cross involving the mutant and fertile UPAS-120, including their F1, F2, BC1F1 and BC2F1 generations. The results suggested that the male sterility was genetic and due to a recessive gene.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050522
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  • 8
    Digitale Medien
    Digitale Medien
    Screening effect of impurities in metals: a possible explanation of the process of cold nuclear fusion (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 927-932 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Fluids, plasmas and electric discharges ; Fermi-Thomas model ; Fusion reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary The screening length of the deuterium ion by surrounding electrons in a palladium metal lattice, as estimated using two approaches—viz. the Thomas-Fermi screening theory and the Debye screening theory for plasmas in metal—is found to be less than the interatomic separation of ordinary hydrogen molecules. This has important implications for the possibility of cold nuclear fusion at room temperature, since slight fluctuations in equilibrium conditions may drive the deuterons to fuse together. The relative magnitudes of screening length for the cold nuclear fusion regime and classical hot nuclear regimes (inertial and magnetic confinement) reveal that in the former a comparatively smaller amount of energy is needed to overcome the repulsive Coulomb barrier between two deuterium ions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02455300
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  • 9
    Digitale Medien
    Digitale Medien
    Growth of a nonuniform ripple on a Gaussian beam in a plasma (1979)
    Springer
    Applied physics 18 (1979), S. 97-103 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 50 ; 84
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract In the present paper we have investigated the growth of a radially symmetrical ripple, superimposed on a Gaussian beam propagating in a plasma. The effect of the position and the width of the ripple on its growth has been studied in some detail. The present analysis considers two mechanisms for the redistribution of carriers in the plasma and the effect of redistribution on the growth of the ripple; the two mechanisms are nonuniform collision dominated heating of the carriers and the ponderomotive force arising on account of nonuniform intensity distribution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00935910
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of signal-modulated optical radiation on the characteristics of a Modfet (1993)
    Springer
    Applied physics 56 (1993), S. 335-341 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 72.40 ; 85.30 ; 85.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The effect of signal-modulated optical radiation on the characteristics of a GaAlAs/GaAs MODFET has been studied analytically. It is found that the offset voltage increases with modulation frequency and the effect of frequency is negligible above 5 MHz. The drain-source current decreases with increase in signal frequency at a constant radiation flux density, doping concentration and drain-source voltage. Studies on sheet concentration and transconductance also show that the signal frequency has a significant effect upto a certain modulation frequency (≲5 MHz) above which the effect of frequency is insignificant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324352
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