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  • Cambridge University Press
  • American Geophysical Union (AGU)
  • 2010-2014  (29)
  • 2005-2009  (20)
  • 1990-1994  (58)
  • 1
    Publikationsdatum: 2013-11-15
    Beschreibung: The stability of a two-dimensional surfactant-free (gas-liquid) foam in a gravitational field is considered. The foam is assumed to have low liquid fraction, so the gas phase can be divided into approximately polygonal bubbles separated by thin liquid films. These free films drain toward accumulations of liquid at the bubble vertices, the Plateau borders, and eventually rupture due to van der Waals intermolecular attractions; this drives foam coarsening through the coalescence of neighbouring bubbles. In particular, we demonstrate how gravitational effects strongly modify the shape of the Plateau border interfaces and enhance the drainage flow in the liquid films, driving non-uniform thinning with exponential decay of the minimum film thickness, significantly faster than the power-law thinning predicted when gravitational effects are negligible. ©2013 Cambridge University Press.
    Print ISSN: 0022-1120
    Digitale ISSN: 1469-7645
    Thema: Maschinenbau , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2010-08-18
    Beschreibung: An ultra-thin viscous film on a substrate is susceptible to rupture instabilities driven by van der Waals attractions. When a unidirectional wind shear is applied to the free surface, the rupture instability in two dimensions is suppressed when exceeds a critical value c and is replaced by a permanent finite-amplitude structure, an intermolecular-capillary wave, that travels at approximately the speed of the surface. For small amplitudes, the wave is governed by the Kuramoto-Sivashinsky equation. If three-dimensional disturbances are allowed, the shear is decoupled from disturbances perpendicular to the flow, and line rupture would occur. In this case, replacing the unidirectional shear with a shear whose direction rotates with angular speed, suppresses the rupture if 2c. For the most dangerous wavenumber, c 102 dyn cm 2 at 1 rad s1 for a film with physical properties similar to water at a thickness of 100 nm. © 2010 Cambridge University Press.
    Print ISSN: 0022-1120
    Digitale ISSN: 1469-7645
    Thema: Maschinenbau , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    Economics and philosophy 6 (1990), S. 139-146 
    ISSN: 0266-2671
    Quelle: Cambridge Journals Digital Archives
    Thema: Philosophie , Wirtschaftswissenschaften
    Notizen: In a recent examination of the origins of ordinal utility theory in neoclassical economics, Robert D. Cooter and Peter Rappoport argue that the ordinalist revolution of the 1930s, after which most economists abandoned interpersonal utility comparisons as normative and unscientific, constituted neither unambiguous progress in economic science nor the abandonment of normative theorizing, as many economists and historians of economic thought have generally believed (Cooter and Rappoport, 1984). Rather, the widespread acceptance of ordinalism, with its focus on Pareto optimality, simply represented the emergence of a new neoclassical research agenda that, on the one hand, defined economics differently than had the material welfare theorists of the cardinal utility school and, on the other, adopted a positivist methodology in contrast to the less restrictive empiricism of the cardinalists.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    The @China quarterly 132 (1992), S. 1062-1085 
    ISSN: 0305-7410
    Quelle: Cambridge Journals Digital Archives
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Geschichte , Politikwissenschaft , Sociologie , Wirtschaftswissenschaften
    Notizen: From the mid-1950s right through the late 1970s jobs in urban China were largely treated as a welfare benefit; life-time employment was the norm and there was neither a buyer's market nor a seller's market for labour. In the state sector hiring was done on the basis of annual quotas established by national level ministries which in turn allocated openings to subordinate offices and factories within each bureaucratic chain of command. For those entering the labour force for the first time, job seeking was defined as “waiting for an assignment” (dai ye) and placement was usually handled within secondary schools by classroom teachers. For those already employed by a state unit, moving to a new employer was a “transfer” (or diao dong) and required appeals to at least two supervisory levels within the firm, and then approval from the administrative supervisors for both new and old employers. For CCP members there were additional sanctioning bodies in the Party hierarchy.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    Recall 5 (1993), S. 3-7 
    ISSN: 0958-3440
    Quelle: Cambridge Journals Digital Archives
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Informatik
    Notizen: The object of this paper is to outline the current thinking of the European Commission, or more accurately of DGXIII in Luxembourg, on the subject of that fascinating point of intersection between language and technology. An initial presentation of background issues will serve as a platform on which to analyse the direction the Commission's policy on linguistic research might take in the 4th Framework Programme (1994–98). Finally some suggestions will be made of ways in which language teachers, and researchers in the field of CALL, could try to become involved in the R+D activities of the Framework Programme (in the short/medium term) and, perhaps more importantly, influence the scientific content of future European Community research programmes.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    The @China quarterly 121 (1990), S. 134-135 
    ISSN: 0305-7410
    Quelle: Cambridge Journals Digital Archives
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Geschichte , Politikwissenschaft , Sociologie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    facet.materialart.
    Unbekannt
    American Geophysical Union (AGU)
    Publikationsdatum: 2014-09-09
    Beschreibung: Population growth, dietary changes and increasing biofuel use are placing unprecedented pressure on the global food system. While this demand likely cannot be met by expanding agricultural lands, much of the world's cropland can attain higher crop yields. Therefore, it is important to examine whether increasing crop productivity to the maximum attainable yield (i.e. yield gap closure) alone can substantially improve food security at global and national scales. Here we show that closing yield gaps through conventional technological development (i.e. fertilizers and irrigation) can potentially meet future global demand if diets are moderated and crop-based biofuel production is limited. In particular, we find that increasing dietary demand will be largely to blame should crop production fall short of demand. In converting projected diets to a globally adequate diet (3000 kcal/cap/day; 20% animal kcal) under current agrofuel use, we find that ~1.8 to ~2.6 billion additional people can be fed in 2030 and ~2.1 to ~3.1 billion additional people in 2050, depending on the extent to which yields can improve in those time periods. Therefore, the simple combination of yield gap closure and moderating diets offers promise for feeding the world's population but only if long-term sustainability is the focus.
    Digitale ISSN: 2328-4277
    Thema: Geologie und Paläontologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2006-01-01
    Beschreibung: Moss et al. (2006) provided comments and criticisms of our recent paper in this journal (Hall et al. 2005). We can appreciate the need for promoting vigorous dialogue among those interested in the research of early sites along the New World Pacific Margin and thus welcome their intervention; however, we are compelled to respond because they raise several points that require clarification and introduce a critical error that must be corrected.
    Print ISSN: 0033-8222
    Digitale ISSN: 1945-5755
    Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 2005-01-01
    Beschreibung: Radiocarbon dates together with geoarchaeological, soil, and lithic analyses are presented to describe archaeological site 35-CS-9 in Bandon Ocean Wayside State Park, Oregon, northwestern USA. One of the few Oregon middle-Holocene coastal sites that includes sediments and artifacts dating to the early Holocene and possibly to the late Pleistocene, it was recorded in 1951 and surface surveyed by archaeologists in 1975, 1986, and 1991, but its depth and antiquity were not tested. In February 2002, we studied the site's stratigraphy and sediments and described 8 strata from the aeolian surface to bedrock at 350 cm depth. Soil samples taken from a cut bank for texture classification, particle size analysis, pH, carbon content, and chemical analysis suggested that the site represented a complete history of Holocene deposits. Excavation of 2 test units in August 2002 uncovered substantial lithic and charcoal remains that confirm a protracted middle-Holocene occupation and suggest that human occupation began in the early Holocene. Charcoal recovered at 235–245 cm dated to 11,000 14C BP, and the deepest lithic artifact was recovered in a level at 215–225 cm. Whether the human occupation was continuous throughout the Holocene, and whether it began in the early Holocene or in the late Pleistocene, can only be determined with further excavations.
    Print ISSN: 0033-8222
    Digitale ISSN: 1945-5755
    Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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