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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 67 (1945), S. 2056-2056 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 20 (1966), S. 596-597 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 397-399 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 560-560 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Standard symbols representing crystal families, two- and three-dimensional Bravais-lattice types and arithmetic classes are recommended for use by the IUCr. The six crystal families are designated by lower-case letters. The family letter in the symbol of each of the 14 lattice types is followed by an upper-case letter to distinguish different lattice types within the family. Arithmetic classes are indicated by modified symbols of the corresponding symmorphic space groups.
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 49 (1945), S. 417-428 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 10 (1965), S. 595-607 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Eine unbegrenzte Kristallstruktur kann nutzbringend nur in einer rationalen Richtung projiziert werden, obwohl ein geeigneter Ausschnitt einer Struktur, z. B. die Elementarzelle, in jeder beliebigen Richtung projiziert werden kann. Projektionsebene kann irgendeine Ebene sein, die nicht parallel zur Projektionsrichtung liegt, aber die Geometrie ist nur in der Ebene senkrecht zur Projektionsrichtung unverzerrt. In vielen Veröffentlichungen wird diese Beziehung nicht beachtet, indem eine Projektion parallel zu einer Achse auf eine Fläche der Zelle gezeichnet wird (als ob es sich um einen Schnitt handle). Die Geometrie von Projektionen parallel zu anderen Richtungen als den Achsen wird bezüglich ihrer metrischen Verhältnisse und der Multiplizitäten der projizierten Zellen in Hinblick auf die räumliche Zelle behandelt. Zum Schluß werden die geometrischen Beziehungen zwischen drei zusammengehörenden Projektionen besprochen und daraus wird eine graphische Methode zur Konstruktion einer Projektion aus zwei beliebigen anderen abgeleitet.
    Notes: Summary A complete crystal structure can be projected usefully only in a rational direction, although an appropriate portion of a structure, such as a unit cell, can be projected in any arbitrary direction. The plane of the projection can be any plane not parallel with the projection direction, but only the plarie normal to the projection direction has undistorted geometry. In many publications this relation is disregarded by mapping an axial projection (as if it were a section) on the face of a cell. The geometry of projections parallel to non-axial directions is discussed with regard to the metric features and the multiplicities of the projected cells as related to the space cell. Finally, the relations between the geometries of sets of three projections are discussed, and from this a graphical method of constructing a projection from any two arbitrary projections is derived.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 31 (1983), S. 207-214 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Diese Arbeit warnt vor der Verwendung der Patterson-Transformation bei der Interpretation von Eigendarstellungen eines regulären Polygons in einer Ebene. Die Eigendarstellung des Polygons wird durch das Quadrieren der Summe der senkrecht stehenden Gitterpunkte verursacht. Aus je zwei solcher Gitterpunkte resultiert ein Produkt, das sowohl als Spitze als auch als Ende eines Vektors behandelt werden kann. In der quadratischen Matrix dieser Paare gibt esn 2 Glieder. Die Hauptdiagonale weistn Paare der Forma i a i auf, die mit dem Ursprung der Eigendarstellung ident sind. Dien 2-n verbleibenden Glieder sind jeweilsa i a j - unda j a i -Paare; diese geben der Matrix sowie der Patterson-Eigendarstellung zentrosymmetrische Eigenschaften. Es gibt zweierlei Arten von ebenen regulären Polygonen: bei der ersten istn gerade und bei der sweitenn ungerade. Polygone, die ein geradesn aufweisen, zeigen Eigendarstellungen von sich selbst, wobei sie bestimmte Scheitelpunkte und Kanten gemeinsam haben. Die Eigendarstellung der Polygone mit einem ungeradenn sind durch stets getrennte Ecken und Kanten charakterisiert.
    Notes: Summary This paper draws attention to the application of the Patterson transformation to the development of the self-images of the regular polygons in a plane. The self-image of the polygon is derived by squaring the sum of the letters representing the vertices. Each resulting two-letter product is treated as a beginning and the end of a vector. In the square matrix of these doublets there aren 2 terms. The main diagonal hasn doublets of the forma i a i which corresponds to the origin of the self-image. Then 2-n remaining terms are pairs of doubletsa i a j anda j a i ; these give the matrix and its Patterson self-image centrosymmetrical properties. The regular plane polygons fall into two categories:n even andn odd. Polygons withn even have self-images of themselves with certain vertices and edges in common. The self-images of the polygons withn odd are always composed of corners and edges which note are distinct.
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  • 9
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 15 (1962), S. 583-590 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 1 (1948), S. 259-263 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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