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  • 1
    facet.materialart.
    Unknown
    Meisenheim, etc. : Periodicals Archive Online (PAO)
    Zeitschrift für philosophische Forschung. 41:4 (1987:Okt./Dez.) 613 
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  • 2
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    Unknown
    Oxford : Periodicals Archive Online (PAO)
    European sociological review. 3:3 (1987:Dec.) 203 
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 36 (1985), S. 358-366 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Summary Direct measurements of the amplified pressure oscillations in a thermally driven gas-liquid system have been made for several temperature ratios. The rates of amplification have been evaluated and compared with theoretical values. From the measured steady-state pressure amplitudes it has also been possible to determine the character of the nonlinear damping.
    Notes: Zusammenfassung Bei thermisch angeregten Gas-Flüssigkeits-Schwingungen wurden die angefachten Druckschwingungen für verschiedene Temperaturverhältnisse direkt gemessen. Dies erlaubte die Ermittlung der Anfachung und einen Vergleich mit theoretischen Werten. Mit den Druckamplituden im stationären Zustand wurde der Charakter der nichtlinearen Dämpfung bestimmt.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A DNA probe (Y-190) is described that specifically hybridizes with repeated DNA sequences in the short arm of the human Y chromosome. The suitability of Y-190 to detect Y-derived DNA is shown in two patients with a 45,X/46,X+marker earyotype and in a third patient previously described as having a 45,X karyotype.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 79 (1988), S. 305-308 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Poly(A)+ RNAs from male and female gonads of 20-day-old rats were translated in vitro using rabbit reticulocyte lysates. The resulting polypeptides were incubated with specific anti-male (anti-H-Y) antisera raisedin female rats by intrasplenic immunization with syngeneic male skin. Using a second antibody, a male-specific polypeptide of molecular weight approximately 18,000 was immunoprecipitated. This male-specific polypeptide was not cotranslationally modified in vitro and appeared to be identical to serological H-Y antigen.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Radiation and environmental biophysics 5 (1969), S. 276-291 
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Description / Table of Contents: Zusammenfassung Aufgabe dieser Arbeit ist es, die Hellempfindung des Auges zu untersuchen. Für eine Qualitatsbeurteilung kunstlich erzeugter Bilder, in denen die Hellempfindungswerte der Bildvorlage reproduziert werden sollen, ist die Kenntnis der Hellempfindungs-charakteristik des Auges, die bei der Bildbetrachtung wirksam ist, wichtig. Beim Fernsehen kommt dem besondere Bedeutung zu, da das Fernsehbild nur einen kleinen Teil des Gesichtsfeldes einnimmt, und daher gönzlich ndere Anpassungsverhältnisse als in der natürlichen Umgebung der Fernsehszene herrschen. Die Hellempfindungscharakteristik läßt sich aus einer Untersuchung der Empfindlichkeit des Auges für Leuchtdichteunterschiede ableiten. In dieser Arbeit wird die Unterschiedsempfindlichkeit unter Hinzuziehung von fünf Versuchspersonen untersucht. Dieses geschieht anhand eines zu diesem Zweck entwickelten Testbildes auf dem Fernsehschirm. Einen entscheidenden Einfluß auf die Erkennbarkeit eines Leuchtdichteunterschiedes hat das Adaptationsniveau des Auges. Die Adaptationsleuchtdichte wird f×r jeden Ort auf dem Fernsehschirm, an dem die Unterschiedsempfindlichkeit als Funktion des Testortes getestet wird, berechnet, unter Zugrundelegung der empirischen Leuchtdichtebewertungsfunktion nachRbhdbe [16].
    Notes: Summary For quality judgement of reproduced images, in which the values of brightness perception of the original have to be reproduced, it is important to know the cheracteristic of the brightness perception being effective when looking at the image. For television it is of special interest to know this characteristic, as the television screen only takes small part of the visual field so that the conditions of adapttion are completely different from those in the original scene. The characteristic of brightness perception can be derived from examinations of the sensitivity of the eye to differences in luminosity. In this report the sensitivity of five persons to differences in luminosity on the television screen has been tested. For this purpose a special test image was developed, produced by means of an electronic device. The adaptation level of the eye has great influence on the perceptibility of differences in luminosity. The level of adaptation produced by the brightness distribution in the image and its neighbourhood is computed at every test spot on the screen by means of an empirical weight-function of luminosity as used by Rehder [16]. Our physiological methods give for the usual range of brightness in television images two main results: 1. The sensitivity takes a maximum approximately at those test spots where the luminosity equals that being in conformity with the level of adaptation. 2. The ability of distinguishing between luminosities rises when the level of adaptation rises.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Transition metal chemistry 10 (1985), S. 361-368 
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Coordination compounds of the S2N2 molecule including methods for their preparation, reactivities, i.r. data, structures, and aspects of chemical bonding are reviewed. Methods of synthesis include reactions of S2N2, S4N4 or (NSCl)3 with metal halides, metal complexes such as carbonyls, or even metals themselves. In all cases, the planar S2N2 ring is coordinated, usuallyvia both, of its nitrogen atoms so that S2N2 acts as a bridging ligand between two metal centres; short contact distances imply that halogen atoms linked to the metal atoms show some interaction with the sulphur atoms. The stability of S2N2 is greatly enhanced by coordination. In the i.r. spectra, two characteristic S2N2 vibrations assist identification of the S2N2 species, a ring stretching mode being observable atca. 850 cm−1 and the out-of-plane deformation at 450–490 cm−1.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Direct Formation of 2,5-Dimethyl-3,3a,4-trithia-1-azapentalenium and 4,6-Dimethyl-3-thioxo-3H-1,2-dithiolo[4,3-c]pyridinium Ions from Acetonitrile and Hydrogen Sulfide. Crystal Structures of their Compounds with [UBr6]2⊖ and [UO2Br4]2⊖The heterocyclic title cations 1 and 2 are formed, along with other products, as [UBr6]2⊖ and [UO2Br4]2⊖ compounds, resp., by the reaction of H2S with a solution of uranium pentabromide in acetonitrile. Their crystal structures were determined by X-ray diffraction. (1)2[UBr6] has planar cations 1 in which the sulfur atoms lie along straight line but with rather different S—S distances.
    Notes: Die im Titel genannten heterocyclischen Kationen 1 und 2 bilden sich neben anderen Produkten als [UBr6]2⊖-bzw. [UO2Br4]2⊖-Salze, wenn H2S in eine Lösung von Uranpentabromid in Acetonitril eingeleitet wird. Ihre Kristallstrukturen wurden mittels Röntgenbeugung bestimmt. (1)2[UBr6] enthält planare Ionen 1, in denen die drei Schwefelatome auf einer geraden Linie liegen, jedoch mit deutlich unterschiedlichen S—S-Abständen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 279-285 
    ISSN: 0009-2940
    Keywords: Acetylene tungsten complexes ; Force constant calculations ; Tungsten acetylene complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Acetylene Complexes of Tungsten: [WCl4(HC ≡ CH)]2, [WCl4(HC ≡ CH)]2 and Crystal Structure of [WCl2(HC ≡ CH)(CH3CN)3] +[WOCl4(CH3CN)]-The tungsten acetylene complexes [WCl4(HC ≡ CH)]2 (1) and [WCl4(DC ≡ CD)]2 (2) are formed by reaction of stoichiometric amounts of acetylene and [D2]acetylene with tungsten hexachloride in dichloromethane. The ether derivatives [WCl4(XC ≡ CX)-(OEt2)] (1a, 2a) are characterized by their 1H- and 13C-NMR spectra. Based on IR spectra, force constant calculations of the structural fragments W(HC ≡ CH) and W(DC ≡ CD) in the complexes 1 and 2 provide calculated values of 3.67 and 3.74 N/cm, respectively, for the WC force constants which are greater than the value of 2.32 N/cm found in hexacarbonyltungsten. Partial hydrolysis of 1 in acetonitrile solution yields [WCl2(HC ≡ CH)(CH3CN)3]+[WOCl4(CH3CN] (3) by redox-disproportionation. Its crystal structure determination reveals that the tungsten atom of the cation has a distorted octahedral environment, coordinated by the side-on bonded acetylene, the two chlorine atoms in orthogonal positions to the acetylene ligand, and by the three N atoms of the acetonitrile molecules.
    Notes: Die wolfram-Acetylenkomplexe [WCl4(HC ≡ CH)]2 (1) bzw. [WCl4(DC ≡ CD)]2 (2) werden durch Einwirkung stöchiometrischer Mengen Acetylen bzw. [D2]Acetylen auf Wolframhexachlorid in Dichlormethan erhalten. Ihre Diethyletherderivate [WCl4(XC ≡ CX)(OEt2)] (1a, 2a) werden durch 1H- und 13C-NMR-Spektren charakterisiert. Kraftkonstantenrechnungen für die Struktrufragmente W(HC ≡ CH) bzw. W(DC ≡ CD) in den Komplexen 1 und 2 auf der Grundlage von IR-Spektren führen zu WC-Valenzkraftkonstanten, die mit 3.67 bzw. 3.74 N/cm größer sind als die in Hexacarbonylwolfram (2.32 N/cm). Partielle Hydrolyse von 1 in Acetonitrillösung führt unter Redox-Disproportionierung zu [WCl2(HC ≡ CH)(CH3CN)3]+[WOCl4(CH3CN)]- (3). Nach der Kristallstrukturanalyse ist das Wolframatom des Kations verzerrt oktaedrich von dem seitlich koordinierten Acetylenliganden, von zwei hierzu orthogonal angeordneten Chloratomen und von drei N-Atomen der Acetonitrilmoleküle umgeben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 81 (1969), S. 934-935 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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