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  • 1
    Electronic Resource
    Electronic Resource
    A self-organizing neural network sharing features of the mammalian visual system (1987)
    Springer
    Biological cybernetics 55 (1987), S. 333-343 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract This paper describes a neural network model whose structure is designed to closely fit neuroanatomical and-physiological data, and not to be most suitable for rigorous mathematical analysis. It is shown by computer simulation that a process of self-organization that departs from a fixed retinotopic order at peripheral layers and includes hebbian modifications of synaptic connectivity at higher processing levels leads to a system that is capable of mimicking various functions of visual systems: In the initial state the overall structure of the network is preset, individual connections at higher levels are randomly selected and their strength is initialized with random numbers. For this model the outcome of the self-organization process is determined by the stimulation during the developmental phase. Depending on the type of stimuli used the model can either develop towards a featureselective “preprocessor” stage in a complex vision system or towards a subsystem for associative recall of abstract patterns. This flexibility supports the hypothesis that the principles embodied are rather universal and can account for the development of various nervous system structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02281979
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  • 2
    Electronic Resource
    Electronic Resource
    Construction and performance of the L3 central tracking detector
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 332 (1993), S. 33-55 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(93)90740-9
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  • 3
    Electronic Resource
    Electronic Resource
    Pentafluorophenylcompounds of polyvalent iodine
    Amsterdam : Elsevier
    Journal of Fluorine Chemistry 16 (1980), S. 568 
    Details
    ISSN: 0022-1139
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-1139(00)84081-6
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation von perfluorisochinolin mit salpetersaure
    Amsterdam : Elsevier
    Journal of Fluorine Chemistry 8 (1976), S. 457-460 
    Details
    ISSN: 0022-1139
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-1139(00)85308-7
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  • 5
    Electronic Resource
    Electronic Resource
    Substitution reactions of IF"5
    Amsterdam : Elsevier
    Journal of Fluorine Chemistry 16 (1980), S. 591 
    Details
    ISSN: 0022-1139
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-1139(00)84100-7
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  • 6
    Electronic Resource
    Electronic Resource
    Addendum (1987)
    Springer
    Biological cybernetics 57 (1987), S. 145-145 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318724
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  • 7
    Electronic Resource
    Electronic Resource
    Kationen mit Xenon - Kohlenstoff-Bindung. 4. Salze mit monosubstituiertem Phenylxenon-Kation: Darstellung, Stabilität und ReaktivitätProfessor Dietrich Mootz zum 60. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1672-1678 
    Details
    ISSN: 0044-2313
    Keywords: xenon-carbon bond ; phenylxenon cation ; F-and CF3-substituted phenylboranes, fluorophenylboranes and fluorophenylborates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cations with Xenon-Carbon Bonds. 4 Salts with Monosubstituted Phenyl Xenon Cation: Preparation, Stability and Reactivity.Nucleophilic fluorine aryl substitution reactions with monosubstituted phenylboranes (X—C6H4)3B and fluorophenylboranes (X—C6H4)nBF3-n (n = 1 and 2; X = m-F, p-F, m-CF3 and p-CF3) on XeF2 lead to the formation of [X—C6H4Xe]+ salts with arylfluoroborate anions [(X—C6H4)nBF4-n]- (n = 2, 1 and 0). Their thermal behaviour, their spectroscopic properties and first investigations concerning their reactivity are reported.
    Notes: Durch nukleophile Fluor-Aryl-Substitution an XeF2 mit monosubstituierten Phenylboranen (X—C6H4)3B und Fluorphenylboranen (X—C6H4)nBF3-n (n = 1 und 2; X = m-F, p-F, m-CF3 und p-CF3) gelangt man zu [X—C6H4Xe]+ Salzen mit Arylfluoroborat-Anionen [(X—C6H4)nBF4-n]- (n = 2, 1 und 0). Deren thermisches Verhalten und spektroskopische Eigenschaften werden beschrieben. Erste Untersuchungen zur Reaktivität der elektrophilen Arylxenon-Kationen werden vorgestellt.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191006
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge Zur Chemie des Brompentafluorids. 3 [5]. Die Reaktionen von Brompentafluorid und Arylbromtetrafluoriden mit N-Basen, von Arylbromtetrafluoriden mit Fluoridionen und die Fluor-Aryl-Monosubstitution am Hexafluorobromat (V)-AnionHerrn Professor Peter Sartori zum 60. Geburtstage gewidmet (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 611 (1992), S. 85-91 
    Details
    ISSN: 0044-2313
    Keywords: Brominepentafluoride ; Arylbrominetetrafluoride ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Chemistry of Brominepentafluoride. 3. Reactions of Brominepentafluoride and Arylbrominetetrafluoride with N-Bases, of Arylbrominetetrafluoride with Fluoride Ions, and the Fluorine-Aryl Monosubstitution Reactions on the Hexafluorobromate (V) AnionBrF5 forms 1 : 1 adducts with pyridines in organic solvents. In BrF5—N-base adducts the axial Br—F bond is activated for fluorine-aryl substitution reactions. Arylbrominetetrafluorides resulting from fluorine-aryl monosubstitutions also yield 1 : 1 adducts with pyridines; in contrast to BrF5 they react with fluoride ions under reductive elimination. Fluorine-aryl substitutions on [BrF6]- are presented and the influence of the Lewis-acidity of the aryltransfer reagent and its coproduct is discussed.
    Notes: Pyridine bilden in organischen Lösungsmitteln 1:1-Addukte mit BrF5. In BrF5—N-Basen— Addukten ist die axiale Br—F-Bindung für Fluor-Aryl-Substitutionen aktiviert. Die bei Fluor-Aryl-Monosubstitutionen resultierenden Arylbromtetrafluoride ergeben mit Pyridinen ebenfalls 1:1-Addukte, reagieren dagegen abweichend von BrF5 mit Fluorid-Ionen unter reduktiver Eliminierung. Fluor-Aryl-Substitutionen am [BrF6]--Ion werden vorgestellt und der Einfluß der Lewis-Acidität des Arylüberträger Edukts und seines Coprodukts diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926110514
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Brompentafluorids. 4. Arylbrom(V)-dioxide und -fluoridoxide (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 209-214 
    Details
    ISSN: 0044-2313
    Keywords: Arylbrominetetrafluoride ; Arylbrominedifluorideoxide ; Arylbrominedioxide ; Brominepentafluoride ; Brominetrifluorideoxide ; Brominefluoridedioxide ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Brominepentafluoride. 4. Arylbromine(V) Dioxides and Fluorideoxides.Arylbromine(V) tetrafluorides RBrF4 (R=C6F5, p- and m-CF3C6H4, o-FC6H4) react in aimed hydrolysis reactions or with (Me3Si)2O to the corresponding arylbrominedioxides RBrO2. However with CsNO3 as reagent for fluorine-oxygen substitution arylbrominedifluorideoxides RBrOF2 are formed.Fluorine-oxygen substitution reactions on BrF5 with (Me3Si)2O and [F3CC(O)]2O in organic solvents proceed via polysubstitution and end under formation of BrO2F whereas with C6F5C(O)OSiMe3 via monosubstitution BrOF3 is obtained.In organic solvents bromine(V) fluorideoxides are  -  similar to BrF5  -  principally accessible to fluorine-aryl substitution what is demonstrated by the formation of C6F5BrO2 from BrO2F.
    Notes: Arylbrom(V)-tetrafluoride RBrF4 (R=C6F5, p- und m-CF3C6H4, o-FC6H4) werden durch gezielte Hydrolyse oder Reaktion mit (Me3Si)2O in die entsprechenden Arylbrom(V)-dioxide RBrO2 überführt. Dagegen erhält man mit CsNO3 als Fluor-Sauerstoff-Substitutionsreagenz Arylbromidifluoridoxide RBrOF2.Fluor-Sauerstoff-Substitutionsreaktionen an BrF5 in organischen Lösungsmitteln mit (Me3Si)2O und [F3CC(O)]2O erfolgen unter Polysubstitution und BrO2F-Bildung, mit C6F5C(O)OSiMe3 kann über die Monosubstitution auch die Stufe des BrOF3 realisiert werden.Bromoxyfluoride sind in organischen Lösungsmitteln - wie BrF5 selbst - prinzipiell der Fluor-Aryl-Substitution zugängig, wie die Darstellung von C6F5BrO2 aus BrO2F belegt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190134
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  • 10
    Electronic Resource
    Electronic Resource
    Pentafluorphenyliod(V)-Verbindungen. 2. Pentafluorphenyliodtetrafluorid C6F5IF4: Synthese durch Fluor-Aryl-Substitution an IF5  -  Eigenschaften und Struktur. Strukturanalyse der monovalenten Iodstammverbindung C6F5IProfessor Peter Paetzold zum 60. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1251-1256 
    Details
    ISSN: 0044-2313
    Keywords: Pentafluorophenyliodinetetrafluoride ; preparation ; crystal structure ; iodinepentafluoride ; tris(pentafluorophenyl)-bismuth ; pentafluorophenyliodinedifluoride, pentafluoroiodobenzene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pentafluorophenyliodine(V) Compounds. 2. Pentafluorophenyliodine Tetrafluoride C6F5IF4: Synthesis via Fluorine-Aryl-Substitution on IF5  -  Properties and Structure. Structural Analysis of the Monovalent Iodine Parent Compound C6F5IThe nucleophilic fluorine-aryl substitution reaction on IF5 with pentafluorophenyl, Bi(C6F5)3, leads to C6F5IF4 in good yields and high purity. The thermal stability of C6F5IF4 and its NMR spectrometric behaviour in solution will be described. The crystal structure of C6F5IF4 will be discussed in comparison to IF5. In addition data of the molecular and crystal structure of the monovalent iodine parent compound C6F5I will be given.
    Notes: Durch nukleophile Fluor-Aryl-Substitution an IF5 mit Pentafluorphenyl, Bi(C6F5)3, gelingt die Darstellung von C6F5IF4 in guten Ausbeuten und hoher Reinheit. Beschrieben wird die thermische Stabilität und das NMR-spektrometrische Verhalten in Lösung. Die Kristallstruktur von C6F5IF4 wird im Vergleich mit IF5 diskutiert. Ferner werden die Molekül- und Kristallstrukturdaten der monovalenten Iodstammverbindung C6F5I mitgeteilt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210725
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