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  • Cambridge University Press (CUP)  (5)
  • 1985-1989  (5)
  • 1987  (5)
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  • Cambridge University Press (CUP)  (5)
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  • 1985-1989  (5)
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  • 1987  (5)
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  • 1
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1987
    In:  Journal of Applied Probability Vol. 24, No. 1 ( 1987-03), p. 160-169
    In: Journal of Applied Probability, Cambridge University Press (CUP), Vol. 24, No. 1 ( 1987-03), p. 160-169
    Abstract: There are a number of ad hoc regression models for the statistical analysis of lifetime data, but only a few examples exist in which physical considerations are used to characterize the model. In the present paper a complete characterization of a regression model is given by solving a functional equation recurring in the literature for the case of a fatigue problem. The result is that, if the lifetime for given values of the regressor variable and the regressor variable for a given lifetime are both Weibull variables (assumptions which are well founded, at least as approximations, from extreme-value theory in some concrete applications), there are only three families of (conditional) distribution for the lifetime (or for the regressor variable). This model is then applied to a practical problem for illustration.
    Type of Medium: Online Resource
    ISSN: 0021-9002 , 1475-6072
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1987
    detail.hit.zdb_id: 1474599-9
    detail.hit.zdb_id: 219147-7
    SSG: 3,2
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1987
    In:  Journal of Dairy Research Vol. 54, No. 1 ( 1987-02), p. 13-18
    In: Journal of Dairy Research, Cambridge University Press (CUP), Vol. 54, No. 1 ( 1987-02), p. 13-18
    Abstract: Levels of free fatty acids (FFA) were determined in milk from cows after 7 months of lactation and 4 months of pregnancy immediately after milking (initial FFA) and after 22 h storage at 4 °C (FFA-22). During the pre-experimental period, cows were at pasture. When housed indoors (experimental period) they were fed hay or grass silage for 3 weeks. Then all cows received grass silage for 3 weeks (post-experimental period). Feeding hay did not increase FFA-22 content in milk compared with pasture, but grass silage feeding enhanced FFA-22 content in milk compared with pasture (+130 %) or hay (+93 %). Increased lipolysis with grass silage was not due to underfeeding of the cows because grass silage and hay were both of high nutritive value. As pasture, hay and grass silage were of the same type (native mountain grassland), the high level of lipolysis occurring with grass silage probably resulted from the method of forage conservation.
    Type of Medium: Online Resource
    ISSN: 0022-0299 , 1469-7629
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1987
    detail.hit.zdb_id: 2000010-8
    SSG: 22
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  • 3
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1987
    In:  Epidemiology and Infection Vol. 99, No. 1 ( 1987-08), p. 1-3
    In: Epidemiology and Infection, Cambridge University Press (CUP), Vol. 99, No. 1 ( 1987-08), p. 1-3
    Abstract: It might seem very late to suggest, nearly 400 years after the first clinical description of influenza and 54 years after its isolation (reviewed by Stuart-Harris. Schild & Oxford, 1985), that many fundamental questions remain to be answered about the virus itself. However the precise antigenic and biochemical structure of the natural field virus has not been established. If so much remains to be learned concerning the nature of the virion then perhaps it may be less surprising that there are some conflicting theories as regards influenza epidemiology. Such questions are raised in the current volume of the journal where Hope-Simpson & Golubev (pp. 5 54) propose a major role for virus persistence in the human disease and, a lesser role for a linked chain of acute infection spreading influenza around the world (see also Hope-Simpson. 1979: 1981). This would be a minority view of the epidemiology of influenza A at present and is most definitely in conflict with the orthodox idea of person to person spread in an endless chain.
    Type of Medium: Online Resource
    ISSN: 0950-2688 , 1469-4409
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1987
    detail.hit.zdb_id: 1470211-3
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  • 4
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1987
    In:  Symposium - International Astronomical Union Vol. 125 ( 1987), p. 408-408
    In: Symposium - International Astronomical Union, Cambridge University Press (CUP), Vol. 125 ( 1987), p. 408-408
    Abstract: The formation of neutron stars in binary systems is often used to explain the nature of specific radio pulsars and characteristics of the pulsar population as a whole. We have investigated the extent to which such scenarios provide a self-consistent description of the pulsar population. Using a computer simulation, we modeled the evolution of the main sequence stellar population and compared the predicted neutron star population to the observed radio pulsar population, focusing our attention on the pulsar velocity distribution and the incidence of binary pulsars. These characteristics relate very directly to the binary nature of pulsar progenitors, and are not strongly dependent on models of pulsar magentic field and luminosity evolution. The need to reproduce both the high velocities typical of pulsars and the low incidence of binary pulsars strongly constrains the formation of pulsars in binary systems. Unless one assumes that virtually all pulsars originate in close binary systems, the observed velocity distribution cannot result from the disruption of binary systems by symmetric supernova explosions; some additional acceleration process (e.g. asymmetric supernova mass ejection or asymmetries in pulsar radiation) must act during or soon after a pulsar's formation. It is possible to reproduce the velocity distribution by assuming that all pulsars are born in binary systems with initial orbital periods less than about 30 years. However, the predicted incidence of binaries is then too large by more than an order of magnitude, unless one also assumes that the process of mass transfer from the primary to the secondary is almost always non-conservative, or that the minimum mass necessary for a stripped helium core to explode as a supernova is larger (over 4 M ⊙ ) than currently believed. Further analyses of the radio pulsar population, the X-ray binary population and the abundances of elements ejected in supernovae should help determine which of these alternatives is most reasonble. Additional studies of the main sequence stellar population, accounting more accurately for evolutionary and observational selection effects, will reduce the uncertainties in modeling the formation of the neutron star population. It has also been suggested that the observed correlation between pulsar velocities and magnetic moments (see Cordes, these Proceedings) is induced by the differing evolutionary paths by which stars in binary systems form radio pulsars. Our simulation does not reproduce this correlation, and we do not find any paths likely to produce low velocity, low magnetic field neutron stars not in binary systems. We are submitting a full description of our model and results to The Astrophysical Journal.
    Type of Medium: Online Resource
    ISSN: 0074-1809
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1987
    SSG: 16,12
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  • 5
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1987
    In:  The British Journal for the History of Science Vol. 20, No. 2 ( 1987-04), p. 201-211
    In: The British Journal for the History of Science, Cambridge University Press (CUP), Vol. 20, No. 2 ( 1987-04), p. 201-211
    Abstract: The British Psychological Society having established a ‘Philosophy and History’ section, a fresh look at the nature of the History of Psychology is called for. In this paper, I would like to make a contribution to this by raising some conundrums which have yet to be adequately addressed. First, though, what has happened in the History of Psychology so far? Psychologists have been writing histories of their discipline since the turn of the century; Baldwin's History of Psychology appeared in 1913, for example, and the first volume of G. S. Brett's trilogy of the same title in 1912, a year which also saw Dessoir's Outlines of the History of Psychology translated into English. This early work was clearly aimed at providing a respectable genealogy for the nascent discipline; only about a fifth of Baldwin's work actually deals with experimental or empirical Psychology dating from later than the mid-nineteenth century, while Brett treats scientific approaches virtually as a coda to a survey of the history of the philosophy of mind. Psychology is presented as the legitimate heir to the main western philosophical tradition, sired on it, so to speak, by physiologists such as Helmholtz, Muller and Broca. In 1929, E. G. Boring published the first edition of his A History of Experimental Psychology , which dominated the field for decades along with Gardner Murphy's Historical Introduction of Modern Psychology of 1928, a lighter weight work but with a somewhat broader range, which served as an introductory text. Both went into subsequent editions, the latter as recently as 1972 (much enlarged). The series The History of Psychology in Autobiography , begun in 1930 and now in its seventh volume (1980), contains professional autobiographies by the ageing eminent of varying levels of self-disclosure, wit and informative value. It is not, however, until the 1960s that a self-conscious sub-discipline calling itself ‘History of Psychology’ emerges within Psychology, being pioneered by the late R. I. Watson in the United States. New histories begin appearing, including Kantor's very positivistic The Scientific Evolution of Psychology Vol. 1 of 1963 and Hearnshaw's A Short History of British Psychology of 1964. In 1965, the Journal for the History of the Behavioral Sciences was started, formally signalling the arrival of the new sub-discipline on the scene. Subsequent events warrant a more critical appraisal.
    Type of Medium: Online Resource
    ISSN: 0007-0874 , 1474-001X
    RVK:
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1987
    detail.hit.zdb_id: 2017943-1
    SSG: 24
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