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  • Articles  (6,720)
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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Le microscope électronique à balayage donne l'image de la surface d'un objet situé dans une boîte à spécimen où a été fait le vide. Un fin pinceau d'électrons balaie la surface synchroniquement avec un tube cathodique dont l'intensité est modulée en fonction du signal secondaire émanant du spécimen. Le système présente une grande profondeur de champ; on peut donc obtenir différentes perspectives du spécimen en le photographiant sous diverses inclinaisons (perspectives qui sont centrales, mais cependant justiciables d'être traitées comme parallèles pour de forts grandissements) et donc le restituer spatialement. On donne dans la première partie les limitations pratiques de l'appareillage, ainsi que le type et les causes de distorsion de l'image. Dans la deuxième partie, on décrit les caractéristiques d'un appareil de restitution adaptéà un cas standard: grandissement des deux clichés d'un stéréogramme: fixe-angle d'ouverture du faisceau perspectif négligeable (c'est le cas pour de forte grossissements) et convergence relative des deux positions de la plaque porte-spécimen est fixe.〈section xml:id="abs1-2"〉〈title type="main"〉Zusammenfassung Das Abtast-Elektronen-Mikroskop liefert Bilder der Oberfläche von Objekten, die sich in einer Vakuum-Kammer befinden. Ein feiner Elektronenstrahl tastet die Oberfläche in Synchronisation mit einer Kathodenstrahlröhre ab, deren Lichtpunkthelligkeit von dem sekundären Elektronensignal, das von der Probe ausgeht, moduliert wird. Das System gestattet eine grosse Schärfentiefe und erlaubt dadurch verschiedene Projektionen des zu photo-graphierenden Musters durch Neigung desselben zwischen aufeinanderfolgenden Aufnahmen. Aus der Kenntnis der Geometrie der Projektion (die eine Zentralprojektion ist, jedoch für sehr stark vergrösserte Bilder annähernd als Parallel- oder Orthogonalfall behandelt werden kann) ist es daher möglich, zu dreidimensionalen Analysen durch Messung von Parallaxen zu kommen. Teil I der Arbeit handelt von den praktischen Problemen, die sowohl aus den Grenzen für die mechanische Konstruktion von Muster-Halterungen und Auswertegeräten als auch den Verzerrungen der Bilder resultieren. Teil II beschäftigt sich mit praktischen Gesichtspunkten der bewährten Auswerteinstrumente, die speziell für die Lösung eines standard-isierten Problems der Elektronenmikroskopie konstruiert wurden. Bei diesen wird die Vergrösserung der beiden Halbbilder eines Stereobildpaars konstant gehalten, der Divergenzwinkel der peripheren “Strahlen”, die sich aus dem zentralen “Strahl” ergeben, wird als vernachlässigbar angesehen (was bei Bildern mit starker Vergrösserung der Fall ist) und die Neigungswinkeldifferenz zwischen den zwei Lagen der Probe ist konstant.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The article describes an experiment in which a production block of aerial triangulation, observed by the method of independent models, was repeatedly computed using differing amounts and configurations of control. The block was recomputed to investigate the effects of control errors, of dispensing with the tie strips and of applying different weights to control and tie points. The connexion between the quality of the join of individual models and that of the adjusted block was also investigated.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméOn décrit une série d'essais effectués sur un bloc de production de triangulation aérienne analytique traité par la méthode des modèles indépendants, destinés àétudier l'influence du nombre et de la configuration des points du canevas d'appui, l'effet d'erreurs sur les points d'appui, l'effet des bandes transversales, et du choix des poids pour les points d'appui et de liaison. On a aussi examiné la corrélation entre la qualityé de l'enchaînement des modèles individuels et celle du bloc compensé.〈section xml:id="abs1-3"〉〈title type="main"〉ZusammenfassungBeschreibung eines Versuchs, bei dem ein Aerotriangulationsblock aus der Produktion, der nach der Methode der unabhängigen Bildpaare beobachtet worden war, wiederholt bei verschiedenen Anzahlen und Anordnungen von Passpunkten berechnet wurde. Die Berechnungen erfolgten zur Abschätzung der Einflüsse von Passpunktfehlern. Weiter wurde der Anschluss zu Nachbarstreifen und die Anwendung verschiedener Gewichte für Pass- und Verbindungspunkte untersucht. Desgleichen wurde der Zusammenhang zwischen der Qualität des Zusammenschlusses einzelner Modelle und der des ausgeglichenen Blockes untersucht.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @photogrammetric record 8 (1975), S. 0 
    ISSN: 1477-9730
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Review of income and wealth 21 (1975), S. 0 
    ISSN: 1475-4991
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: The reliability of national accounts is determined by the adequacy of a great variety of data sources and estimating methods. This inquiry focuses on major conceptual and methodological problems, and while it does not solve the reliability problem, it provides a framework for reliability analysis and suggests criteria for the evaluation of results; it also assists the producers of national accounts in determining the major trade-offs between different areas of possible data improvement.
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  • 19
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Review of income and wealth 21 (1975), S. 0 
    ISSN: 1475-4991
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This article present estimates, in current prices, of the national wealth of Japan and of about a dozen components for twelve benchmark dates between 1885 and 1973, the distance ranging, with one exception, from five to twelve years. The estimates are derived by a combination of (a) Ohkawa's perpetual inventory estimates of reproducible fixed assets for the period from 1885 to 1940 and Economic Planning Agency censuses for 1950 to 1965, roughly extrapolated to 1973; with (b) estimates of other components of national wealth (land, inventories, consumer durables and net foreign assets) taken for the pre-war period chiefly from census-type data and derived for the postwar period from miscellaneous, mainly official, sources.As in most countries the current value of Japan's national wealth increased until World War II considerably more slowly than its national product, which expanded with extraordinary rapidity. In the postwar period, however, the ratio showed a slight upward trend reaching by 1973 fully 3 1/2. The ratio of all reproducible assets to national product showed a similar pattern at a lower level, reaching 2 1/2 in 1973. In contrast the ratio of so-called productive assets (non-residential buildings, equipment and inventories) failed to show a definite secular trend remaining between 1.5 and 2.2 at all but one benchmark date.Changes in the structure of national wealth over the past century were pronounced, but very different before and after World War II. Up to the 1940's, the share of land declined sharply from about one-half to less than one-fourth, to the benefit primarily of producer durables and non-residential structures. In the last quarter of a century, in contrast, the extraordinary rise in urban land prices brought the share of land in national wealth back to one-third (though the share of agricultural land continued to decline rapidly), while that of producer and consumer durables continued to increase.
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  • 20
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Review of income and wealth 21 (1975), S. 0 
    ISSN: 1475-4991
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: The purpose of this article is to record the history of the national income and product accounts of the United States, concentrating on the period 1932–47. During that period the single national income aggregate evolved into a set of accounts and the estimates emerged as an important analytical tool. Interviews with participants in these developments were extensively utilized to trace the events, people, ideas, and other factors which shaped the history of the accounts.The generally recognized need for economic information during the Great Depression stimulated the request that the Department of Commerce undertake what became the first official continuing series on national income in the United States. These estimates were prepared with the cooperation of the National Bureau of Economic Research and were published in 1934. By the late 1930's, estimates were extended to include income by state and a monthly series. World War II was the impetus for the development of product, or expenditure, estimates. By the mid-1940's, the estimates had evolved into a set of income and product accounts–a consolidated production account, sector income and outlay accounts, and a consolidated saving-investment account–designed to provide a bird's-eye-view of the economy. During this period uses of the accounts widened; analysis of wartime production goals and anti-inflation policy are noteworthy examples. The National Income, 1947 Edition was the culmination of a period of intensive conceptual discussion, extension of data sources, and improvement of estimating techniques. Thereafter the mainlines of development are more familiar, encompassing refinement and elaboration of the estimates and proliferation of uses.
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