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  • 1
    ISSN: 1612-1112
    Keywords: Inverse gas chromatography ; Carbon fibres and graphite ; Specific interactions ; Polarisability ; Molar deformation polarisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In the study of mesophase pitch-based carbon fibres and graphite powders, the application of previously recommended methods to study solid surface polarity by inverse gas chromatography at infinite dilution has failed. A new method based on the possibility of distinguishing the specific interaction component from the measurable total interactions by theoretical analysis of the dispersive interactions expressed as a function of molar deformation polarisation of molecules has therefore been developed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8264
    Keywords: cytoplasm ; endoplasmatic reticulum ; ingrowth ; mitochondria ; nuclei ; vesicles ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The most basal endosperm cells of maize (Zea mays L.) began differentiating into transfer cells in 10 days after pollination (DAP). The thickening and ingrowths forming in the transfer cell wall were slow during 10 and 15 DAP. There were many vesicles, silky and string ball objects in cytoplasm, and the number of mitochondria and rough endoplasm reticulum increased. After 15 DAP, the wall thickening and ingrowths forming in the transfer cells sped up. By 20 DAP, the transfer cell zone had developed, there appeared 65 - 70 rows of cells in width and 3 - 4 layers of cell in depth, the obvious cell wall ingrowths presented strong positive reaction with periodic acid Schiff's reagent. After 20 DAP, no significant change appeared in the shape and structure of the transfer cells, and the transfer cells entered function stage. In the mature kernels (53 DAP), the most basal transfer cells were filled with ingrowths, however, dense cytoplasm was also found in these cells. The nuclei had quite irregular shapes in these cells. Some transfer cells contained black grains and crystals. A black layer formed in the pericarp tissue adjacent to the transfer cell zone. Full development of endosperm transfer cells was important for reduction of kernel abortion and increase of kernel mass.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 275 (1997), S. 953-957 
    ISSN: 1435-1536
    Keywords: Key words Polypyrrole ; colloid ; electrochemistry ; charge transport ; modified electrode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The electrochemical behavior and charge transport of colloidal polypyrrole particles (without stabilizer) modified electrode have been investigated. The voltam-metric results show that the electro-chemical behavior of colloidal polypyrrole is different from that of polypyrrole synthesized electro-chemically. The strong adsorption of the colloidal particles on substrate makes it easy to form a polypyrrole modified electrode. The charge transport of polypyrrole is controlled by the diffusion of counterions.
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  • 4
    ISSN: 1573-5044
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mature zygotic embryos of Liriope platyphylla Wang et Tang formed embryogenic calluses at a frequency of 33% when cultured on Murashige and Skoog (MS) medium supplemented with 4.52 μM 2,4-dichlorophenoxyacetic acid. Upon transfer to half-strength MS basal medium, embryogenic calluses gave rise to numerous somatic embryos, which then developed into plantlets. Regenerated plantlets were successfully transferred to potting soil, where they were subsequently grown to maturity.
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  • 5
    ISSN: 1573-5044
    Keywords: protoplast ; somaclonal variation ; somatic embryo ; tissue culture ; Umbelliferae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hypocotyl segments of Bupleurum falcatum L. formed embryogenic calluses when cultured on Murashige and Skoog's (MS) medium supplemented with 9.0 μM 2,4-dichlorophenoxyacetic acid (2,4-D). Suspension cultures were initiated by placing calluses into medium with 0.45 μM 2,4-D. Protoplasts were enzymatically isolated from suspension cultures. They were plated at a density of 5 × 104 protoplasts per ml on MS medium supplemented with 9% mannitol, 9.0 μM 2,4-D, 4.4 μM BA, 4.6 μM kinetin, and 0.6% Seaplaque agarose. After four weeks of culture, microcalluses were formed and subsequently transferred to MS solid medium with 18.1 μM 2,4-D. Upon transfer to MS basal medium, microcalluses gave rise to somatic embryos at a frequency of approximately 10%. They subsequently developed into plantlets. The regenerants were successfully transplanted to potting soil and grown to maturity in a greenhouse. The regenerants had the normal chromosome number of 2n=2x=20 and did not show morphological aberrancy.
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  • 6
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A new concept for compensation of birefringence in solid-state rod lasers is presented. The basic idea of our approach is the simultaneous use of an in-cavity polarization rotator and an imaging optical system between the two passes through the laser rod. The theoretical analysis based on matrix optics shows that perfect compensation for the birefringence and bifocusing in laser rods is possible for a large pumping range. Experimental results with two Nd:YAG rods are also presented. The measured depolarization loss per transit for a test beam at 0.63 μm is less than 5% for pumping power up to 6kW per rod. This would allow efficient generation of high-power TEM00 mode and linearly polarized multimode output power from Nd:YAG oscillators in rod geometry.
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  • 7
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport properties of hydrogenated amorphous silicon (a-Si:H) with a hydrogen content ranging from 12% to less than 1%, which were produced by the hot-wire technique, varying the deposition substrate temperature, 290 °C〈TS〈400 °C, were systematically studied by the photoconductive frequency mixing technique. With an increase of the deposition substrate temperature, and consequent decrease of hydrogen content, the photoconductivity, σpc, and the drift mobility, μd, are found to decrease, while the width of the conduction band tail, ε, increases. Continuous degradations of photoconductivity, drift mobility, and photomixing lifetime, τ, were found during light soaking experiments. In addition, it was found that the drift mobility increases and the photomixing lifetime decreases with an increase of the applied electric field, while the photoconductivity is essentially independent of the electric field within the range of 1000–10 000 V cm−1. Furthermore, the electric field dependence of the drift mobility in the annealed state is always larger than in the light-soaked state. The results for the electric field dependence are explained using the model of long-range potential fluctuations, whose range can be determined by employing an analysis previously developed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1377-1379 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed laser deposition was used to grow high-quality Y-Ba-Cu-O (YBCO) and CdS thin films sequentially on MgO. A temperature window between 200 and 250 °C was found to be suitable for the deposition of CdS on YBCO. The transition temperature of the heterostructure was measured to be 72 K while the single YBCO film had a Tc of 85 K. The degradation was determined to be due to interface reaction, rather than the result of poor deposition conditions. X-ray measurements indicated that the CdS film was hexagonal and c-axis oriented. In situ resistivity measurement was used to monitor the film growth dynamics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 540-542 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The degree of texturing of the grains in epitaxial in situ Y-Ba-Cu-O films was studied by x-ray pole-figure measurements. These high Tc and Jc laser deposited films were all aligned with the c axis perpendicular to the substrate surface. It was found that films on SrTiO3(001) and LaAlO3(001) were totally aligned with the YBCO a axis parallel to the 〈100〉 direction on the substrate. For MgO(001), 4% of the grains are aligned in the 〈110〉 direction. For yttria stabilized zirconia (001), the a axes of the YBCO grains were distributed between the 〈100〉 and 〈110〉 directions on the substrate. These observations are consistent with the degree of lattice mismatch in the various crystal orientations.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 11 (1971), S. 369-376 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The dynamic mechanical properties of polyester and polyether urethane block polymers have been investigated at four frequencies (3.5, 11, 35 and 110 Hz) in the temperature range of  -  150 to 200°C. The existence of a two phase structure was demonstrated in these systems by the observation of two major transition regions corresponding to (1) the glass transition temperature (Tg) of the ester or ether soft segments, and to (2) the softening temperature of the aromatic-urethane hard segments. Several secondary relaxations were observed in addition to the two major relaxations. It was possible to assign molecular mechanisms to each of these relaxations. All relaxation phenomena were greatly influenced by the molecular weight of the prepolymer, weight percent of hard segments, and thermal history. An increase in the molecular weight of the prepolymer above 1,000 at constant hard segment content resulted in a semi-crystalline material, which possessed a lower Tg for the macroglycol segments. Annealing to enhance crystallinity increased the Tg of the soft segments, consistent with the usual observation in semicrystalline homopolymers. These findings suggest that the relaxation mechanisms of polyurethane block polymers are not only influenced by the degree of crystallinity, but also by the nature of the domain structure.
    Additional Material: 8 Ill.
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