| 1. |
- Stephansson, Ove, et al.
(författare)
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Nuclear power production in an underground chain
- 1984
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Ingår i: Rock mechanics. - Rotterdam : Balkema Publishers, A.A. / Taylor & Francis The Netherlands. - 9061912350 ; , s. 1193-1197
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Konferensbidrag (refereegranskat)
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| 2. |
- Behravan, G., et al.
(författare)
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THE INTERACTION OF ELLIPTICINE DERIVATIVES WITH NUCLEIC-ACIDS STUDIED BY OPTICAL AND H-1-NMR SPECTROSCOPY - EFFECT OF SIZE OF THE HETEROCYCLIC RING
- 1994
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Ingår i: Biopolymers. - : Wiley. - 0006-3525 .- 1097-0282. ; 34:5, s. 599-609
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Tidskriftsartikel (refereegranskat)abstract
- The DNA interaction of derivatives of ellipticine with heterocyclic ring systems with three, four, or five rings and a dimethylaminoethyl side chain was studied. Optical spectroscopy of drug complexes with calf thymus DNA, poly [(dA-dT).(dA-dT)], or poly [(dG-dC).(dG-dC)] showed a 10 nm bathochromic shift of the light absorption bands of the pentacyclic and tetracyclic compounds upon binding to the nucleic acids, which indicates binding by intercalation. For the tricyclic compound a smaller shift of 1-3 nm was observed upon binding to the nucleic acids. Flow linear dichroism studies show that the geometry of all complexes is consistent with intercalation of the ring system, except for the DNA and poly [(dG-dC).(dG-dC)] complexes of the tricyclic compound, where the average angle between the drug molecular plane and the DNA helix axis was found to be 65 degrees. One-dimensional H-1-nmr spectroscopy was used to study complexes between d(CGCGATCGCG)(2) and the tricyclic and pentacyclic compounds. The results on the pentacyclic compound show nonselective broadening due to intermediate chemical exchange of most oligonucleotide resonances upon drug binding. The imino proton resonances are in slow chemical exchange, and new resonances with upheld shifts approaching 1 ppm appear upon drug binding, which supports intercalative binding of the pentacyclic compound. The results on the tricyclic compound show more rapid binding kinetics and very selective broadening of resonances. The data suggest that the tricyclic compound is in an equilibrium between intercalation and minor groove binding, with a preference to bind close to the AT base pairs with the side chain residing in the minor groove. (C) 1994 John Wiley and Sons, Inc.
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| 3. |
- Bergman, Bo, et al.
(författare)
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A family of test statistics for detecting monotone mean residual life
- 1989
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Ingår i: Journal of Statistical Planning and Inference. - : Elsevier BV. - 0378-3758 .- 1873-1171. ; 21:2, s. 161-178
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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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| 4. |
- Bergman, Bo, et al.
(författare)
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A graphical method applicable to age-replacement problems
- 1982
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Ingår i: IEEE Transactions on Reliability. - 0018-9529 .- 1558-1721. ; R-31:5, s. 478-481
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Tidskriftsartikel (refereegranskat)abstract
- The Total Time on Test (TTT) concept has proven to be a very useful tool in several reliability contexts. The objective of this note is to illustrate how a generalization of the TTT-concept, the TTT-transform, defined as a certain function of the survivor function, can be used when analyzing different types of age-replacement problems. (14 refs.)
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| 5. |
- Bergman, Bo, et al.
(författare)
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A note on some test statistics against HNBUE
- 1987
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Ingår i: Annals of the Institute of Statistical Mathematics. - 0020-3157 .- 1572-9052. ; 39:3, s. 483-488
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Tidskriftsartikel (refereegranskat)abstract
- Some comments and extensions are given to the paper on statistics for testing exponentiality against the HNBUEE property (i.e. {Mathematical expression} ≦μ exp(-t/μ), t≧0) by Basu and Ebrahimi
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| 6. |
- Bergman, Bo, et al.
(författare)
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Letter to the editors
- 1988
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Ingår i: Reliability Engineering & System Safety. - : Elsevier BV. - 0951-8320 .- 1879-0836. ; 21:2, s. 155-160
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Bergman, Bo, et al.
(författare)
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Recent applications of the TTT-plotting technique
- 1998
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Ingår i: Frontiers in reliability. - Singapore : World Scientific and Engineering Academy and Society. - 9810233604 ; , s. 47-61
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Bergman, Bo, et al.
(författare)
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Statistical engineering for quality and productivity improvements
- 1990
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Ingår i: European Journal of Engineering Education. - : Informa UK Limited. - 0304-3797 .- 1469-5898. ; 15:3, s. 257-266
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Tidskriftsartikel (refereegranskat)abstract
- The quality concept is strongly connected with customer satisfaction. One important reason for the quality and productivity success in Japanese industry is a consequent and systematic use of statistical methods during different stages of the production process. The quality challenge of European industry therefore implies claims both on the industry to use more statistical methods and on the teaching of statistics at engineering schools at different levels. The authors discuss the modern quality development and the role of statistical methods in this development. They also emphasize its strong implications for the teaching of statistics at engineering schools (27 refs.)
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| 9. |
- Bergman, Bo, et al.
(författare)
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Statistics and TQM in industrial continuing education
- 1994
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Ingår i: International Journal of Continuing Engineering Education and Life-Long Learning. - 1560-4624 .- 1741-5055. ; 4:1/2, s. 114-121
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Tidskriftsartikel (refereegranskat)abstract
- The urgent industrial transformation towards total quality management (TQM) and the role of statistics in this transformation are discussed. Implications for the teaching of statistics and TQM principles are drawn. In particular, implications for continuing education are discussed (10 refs.)
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| 10. |
- Bergman, Bo, et al.
(författare)
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Testing against HNBUE with randomly censored data
- 1985
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Ingår i: Contributions to probability and statistics in honour of Gunnar Blom. - Lund : Lund University. Department of Mathematical Statistics. ; , s. 49-72
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The "harmonic new better than used in expectation" (HNBUE) class of life distributions contains all the more familiar classes from reliability theory such as the "increasing failure rate" (IFR) and "new better than used" (NBU), while still allowing one to formulate interesting inequalities comparing such distributions with the memoryless exponential distribution. In this paper test statistics based on the product-limit estimator are derived for testing the hypothesis of HNBUE versus exponentiality given a sample of censored observations from the life distribution of interest. A study of the asymptotic relative efficiency focusses on the loss of information due to censoring.
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