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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);srt2:(1989)"

Sökning: LAR1:ltu > (1980-1989) > (1989)

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51.
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52.
  • Bergman, Bo, et al. (författare)
  • A family of test statistics for detecting monotone mean residual life
  • 1989
  • Ingår i: Journal of Statistical Planning and Inference. - : Elsevier BV. - 0378-3758 .- 1873-1171. ; 21:2, s. 161-178
  • Tidskriftsartikel (refereegranskat)abstract
    • The mean residual life of a life distribution F with survival function F̄=1-F is defined as e(x)=(sh{phonetic}∞xF̄(t)dt)/F̄(x) if F̄(x)>0 (e(x)=0 if F̄(x)=0). The function e(x) has proved to be of great interest in many different areas such as biometry, reliability and social sciences. The class DMRL (IMRL) consists of those life distributions which have decreasing (increasing) mean residual life; i.e. e(x) is a decreasing (increasing) function of x. In this paper we present and study a family of test statistics intended for testing exponentiality against DMRL (IMRL). The family includes the test statistics proposed for the same purpose by Hollander and Proschan (1975) for complete samples and later generalized by Chen et al. (1983a) to accomodate randomly right censored samples. We compare the efficiency for different members in the family of test statistics when testing against some different alternatives. Furthermore, we study the efficiency loss due to different amount of exponential censoring. The asymptotical normal distribution of the test statistics are presented and the quality of the normal approximation is also discussed
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53.
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54.
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56.
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57.
  • Bernander, Stig, et al. (författare)
  • Improved model for progressive failure analysis of slope stability
  • 1989
  • Ingår i: Proceedings of the twelfth International Conference on Soil Mechanics and Foundation Engineering. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 90 6191 890 1 ; , s. 1539-1542
  • Konferensbidrag (refereegranskat)
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58.
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59.
  • Billström, Kjell, et al. (författare)
  • U-Pb zircon age of the Rostberget W-occurrence, northern Sweden
  • 1989
  • Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 111:2, s. 121-126
  • Tidskriftsartikel (refereegranskat)abstract
    • Anomalously U-rich granites of the so-called Revsund type, associated with W- and Sn-enrichments, occur in the Gunnarn area close to Storuman in northern Sweden. At Rostberget, a swarm of thin undeformed wolframite-bearing greisen veins are situated in the interior of the Joran granite intrusion. We have dated zircons from a sample of the greisen veins with the U-Pb method. The veins are less than 1 cm wide and it is likely that the sample also contains zircons from the immediately surrounding altered granite. The mineralizing event and connected metasomatic processes probably released Zr from the granite which became available for zircon growth processes in the greisen veins. One notable feature, probably due to the greisen-forming processes, is the very high common Pb concentrations characterizing the zircons. By varying the assumed common Pb composition in the calculations, the effect on resulting intercept ages has been evaluated. The obtained age interval (1775-1782 Ma) is typical of formation ages for Revsund granites, which indicates that the mineralization event at Rostberget followed closely upon the granite emplacement. We conclude that the Revsund-type granites, which cover large areas, were generated in a narrow time interval 1790-1775 Ma ago.
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60.
  • Bjarnason, B., et al. (författare)
  • New developments in hydrofracturing stress measurements at Luleå University of Technology
  • 1989
  • Ingår i: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. - : Elsevier BV. - 0148-9062 .- 1879-2073. ; 26:6, s. 579-586
  • Tidskriftsartikel (refereegranskat)abstract
    • Instrument and theoretical developments in hydrofracturing stress measurements at Lulea University of Technology since the first workshop in Monterey in 1981 are described and the general experience with the method in Sweden is summarized. A new field unit is described which includes a 1000-m long multihose and a 100 MPa water pump. Stress measurements by means of injection tests on preexisting fractures have been introduced and applied at two sites in Sweden. A theory has been developed which permits estimation of the maximum and minimum horizontal stresses in cases where transverse hydrofractures are created in the borehole wall instead of axial.
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