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  • 11
    Electronic Resource
    Electronic Resource
    Fast timing circuit using charge storage diode
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 81 (1970), S. 121-124 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-554X(70)90618-X
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  • 12
    Electronic Resource
    Electronic Resource
    Exchange-coupled magnetic films as models for nonuniform soft magnetic materials
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 41 (1984), S. 321-323 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(84)90209-9
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  • 13
    Electronic Resource
    Electronic Resource
    Determination of Δ4-3-ketosteroids based on oxime formation by difference circular dichroism spectroscopy (2000)
    Springer
    Fresenius' journal of analytical chemistry 368 (2000), S. 384-388 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Δ4-3-Ketosteroids exhibit an intensive negative Cotton effect on the circular dichroism (CD) spectra in the wavelength range for the n-π* electronic transition (270–¶350 nm). With hydroxylamine hydrochloride, Δ4-3-ketosteroid compounds can be transformed into oxime derivatives. Following oxime formation, positive ellipticity with low intensity can be registered in this wavelength range. The quantitative determination of Δ4-3-ketosteroids is based on the considerable difference between the ellipticities before and after oxime formation. The difference ellipticity for the six ketosteroids examined (norethisterone, levonorgestrel, levonorgestrel acetate, methyltestosterone, testosterone phenylpropionate, nortestosterone phenylpropionate) varies linearly with the concentration in the interval 6 × 10–6–3 × 10–3 mol/L. The method can be well applied to determination of Δ4-3-ketosteroid contamination of norgestimate [(+)-13-ethyl-17-hydroxy-18,19-dinor-17α-pregn-4-en-20-yn-3-one oxime acetate]; 0.02–10% impurity can be measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000456
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  • 14
    Electronic Resource
    Electronic Resource
    Slow-fast coincidence system for a fast neutron time-of-flight spectrometer (1963)
    Springer
    Czechoslovak journal of physics 13 (1963), S. 754-764 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The authors describe the arrangement of a slow-fast coincidence system for a fast neutron time-of-flight spectrometer. In the “fast” section of the instrument a fast differential coincidence circuit is used. Compared with the original arrangement [1] the circuit permits a higher system stability to be achieved. In the concluding part of the paper results are given of measurements on neutrons from the Li7(d, n) Be8 reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01787803
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  • 15
    Electronic Resource
    Electronic Resource
    Measurement of neutron spectra from (d, n) reactions on light nuclei (1960)
    Springer
    Czechoslovak journal of physics 10 (1960), S. 715-721 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Abstract В работе описан спект рометр для быстрых не йтронов, основанный н а принципе измерения времени пр олета нейтронов. Нейт ронные вспышки образ уются на мишени в результате отклоне ния ионного пучка уск орителя под действие м высокочастотного напряжения на деφлек торе. Время пролета не йтронов измеряется б ыстро-медленной схемой совпадений с б ыстрым совпадением н а измерительной коак сиалной линии. На спектрометре измеря лись нейтроновые спе ктры реакций D(d, n) He3,T(d, n) He4, Li7 (d, n) Be8, Li7(d, n) 2α Be9(d, n) В10. Нейтроны с энергией 4,06 MeV реакции Li7(d, n) Be8 до сих пор не были опи саны в литературе. Они соответствуют уровн ю 11,7 MeV в ядре Be2, известному из других ядерных реакц ий.
    Notes: Abstract A description is given of a fast neutron spectrometer, based on the principle of measuring the time-of-flight of the neutrons. Neutron bursts are formed in a target by deflection of the ion beam of an accelerator by a radio-frequency voltage on the deflector. The time-of-flight of neutrons is measured by a slow-fast coincidence system with fast coincidence on the measuring line. The spectrometer was used to measure the neutron spectra of the reactions D(d, n)He3, T(d, n)He4, Li7(d, n)Be8, Li7(d, n)2α, Be9(d, n)B10. Neutrons with energy 4·06 MeV from the reaction Li7(d, n)Be8 have not yet been reported in the literature. They correspond to the 11·7 MeV level in the nucleus Be8, known from other nuclear reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558101
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  • 16
    Electronic Resource
    Electronic Resource
    Small RNAs of Tetrahymena thermophila (1987)
    Springer
    Molecular biology reports 12 (1987), S. 13-19 
    Details
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Highly purified nuclear and cytoplasmic RNAs were obtained from Tetrahymena thermophila BVII containing only a minimal amount of cross-contamination. In the nuclear RNA fraction we have detected at least 6 distinct snRNAs. Some of the RNA species showed microheterogeneity. SnRNAs of Tetrahymena thermophila are very similar to rat snRNAs, as far as length is concerned. Our cytoplasmic small RNA fraction contained two RNAs, 7S and T7, reported recently (18) as nuclear, particularly nucleolar RNAs. Moreover, we could detect only one cytoplasmic small RNA species Tc1, Tc2 was not observed. Neither the nuclear nor the cytoplasmic small RNA species are degradation products of ribosomal RNA as was shown by Northern blotting and following hybridization with pGY17 containing the entire transcribed region of the ribosomal DNA of Tetrahymena thermophila.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580645
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  • 17
    Electronic Resource
    Electronic Resource
    Reactions of binary and ternary alkali metal carbonate mixtures with aluminium oxide (1976)
    Springer
    Journal of thermal analysis and calorimetry 9 (1976), S. 241-250 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié à l'aide d'un Derivatograph, sous diverses conditions, la réaction de mélanges binaires et ternaires des carbonates alcalins avec l'oxyde d'aluminium. L'identification des produits formés a été effectuée par diffraction des rayons X. Si les mélanges binaires et ternaires de carbonates contiennent du carbonate de lithium, il se forme toujours 1'α-métaaluminate de lithium, qui, à température plus élevée, se transforme en la formeγ. Si la carbonate de lithium est utilisé seul, on peut obtenir aussi l'ortho-dialuminate.
    Abstract: Zusammenfassung Die Reaktionen binärer und ternärer Alkalikarbonatmischungen mit Aluminiumoxid wurden mittels eines Derivatographen unter verschiedenen Bedingungen untersucht. Die Reaktionsprodukte wurden durch Röntgendiffraktion identifiziert. In Gegenwart Li2CO3-haltiger binärer und ternärer Karbonatmischungen war das Produkt stets α-Lithium-meta-aluminat, das bei höheren Temperaturen in dieγ-Form überging, während bei Einsatz von Li2CO3 auch Orthodialuminat erhalten werden konnte.
    Notes: Abstract Reactions of binary and ternary alkali metal carbonate mixtures with aluminium oxide were studied by means of a derivatograph under different conditions. Reaction products were identified by X-ray diffraction. In the presence of binary and ternary carbonate, mixtures containing Li2CO3 the product was alwaysα-lithium metaaluminate, transforming to theγ-form at higher temperatures, while using only Li2CO3 the orthodialuminate could be obtained too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01909387
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  • 18
    Electronic Resource
    Electronic Resource
    Characterization of peak purity by fast multiscan circular dichroism detection (1998)
    Springer
    Chromatographia 48 (1998), S. 584-588 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Circular dichroism detection ; Multiscan detection ; Peak purity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method has been developed to detect inhomogeneity of apparently homogeneous peaks of very similar analytes. The method utilizes the rapid scan feature of state-of-the-art spectrometers/detectors that allow the recording of up to 30 spectra in a single chromatographic peak. Sensitivity and selectivity are enhanced by chiroptical/optical detection. Thus, identification of “front” and “rear” components of the peak can be carried out. The method is exemplified by mixtures of codeine, hydrocodone and oxycodone as analytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466654
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  • 19
    Electronic Resource
    Electronic Resource
    Coexpression of opsin- and VIP-like-immunoreactivity in CSF-contacting neurons of the avian brain (1988)
    Springer
    Cell & tissue research 253 (1988), S. 189-198 
    Details
    ISSN: 1432-0878
    Keywords: Cerebrospinal fluid-contacting neurons ; Monoclonal antibodies ; Opsin ; VIP ; Extraocular photoreceptors ; Ring dove ; Coturnix coturnix ; Anas platyrhynchos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cerebrospinal fluid-contacting (CSF) cells in both the septal and the tuberal areas in the brain of the ring dove are labeled by RET-P1, a monoclonal antibody to opsin that reacts with inner and outer segment membranes of rod photoreceptors in a variety of vertebrates. Immunoblot analysis of proteins from diverse brain regions, however, revealed bands of anti-RET-P1 immunoreactivity that did not correspond to opsin. Binding of RET-P1 to opsin-containing membranes, was not inhibited by membranes rich in muscarinic and β-adrenergic receptor proteins (red blood cells, heart, lung) taken from doves. RET-P1-immunoreactive CSF-contacting cells emit a dendritic process that penetrates the ependyma and ends in a knob-like terminal suspended in the ventricle. These cells also possess other processes that penetrate more or less deeply into the neuropil. Additionally, a band of labeled fibers occurs in the external layer of the median eminence. A double-label technique demonstrated that RET-P1-positive cells coexpress VIP-like immunoreactivity. VIP-positive cells in other brain areas are not RET-P1-positive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221754
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  • 20
    Electronic Resource
    Electronic Resource
    Wide Gap Hydrogenated Amorphous Silicon for Visible Light Emission (2000)
    Springer
    Journal of porous materials 7 (2000), S. 135-138 
    Details
    ISSN: 1573-4854
    Keywords: wide gap amorphous silicon ; photoluminescence ; electroluminescence
    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 A series of samples of hydrogenated amorphous silicon (a-Si:H) was prepared from silane diluted highly with He by the microwave electron-cyclotron-resonance PE CVD. Such a wide gap (E≥2.0 eV) a-Si:H emits room temperature photoluminescence (PL) in the visible region. We attempt to reveal the microscopic origin of this PL by monitoring variations of PL intensity vs frequency of infrared vibrations in the vicinity of 2100 cm−1. We find that oligosilanes -(SiH2)n- act as one type of possible luminescence centres. We report also on room temperature electroluminescence (EL) from p-i-n junctions. Surprisingly, and unlike p-i-n structures from standard a-Si:H, weak EL radiation with external quantum efficiency of the order of 10−5% is emitted under reverse bias only. EL and PL emission spectra resemble strongly each other, except high energy wing of the EL spectrum. This high energy widening indicates the participation of hot electrons in the EL excitation mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009692300389
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