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Nonparametric Estimation of Fractal Dimension

作者:科技文献资料网 时间:2017-06-24 11:42:50  浏览:8449   来源:科技文献资料网
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[唯一标识符]:CDSTIC.SPIE.1001a_015
[文献来源]:国际光学工程学会数据库
[文献类型]:科技会议
[标题]:Nonparametric Estimation of Fractal Dimension
[作者]:Michael C. Stein and Keith D. Hartt, The Analytic Sciences Corporation
[文摘]:"Nonparametric techniques for estimating ftactal dimension arc discussed. These techniques are shown to be more robust and efficient when compared with the standard least-squares estimation techniques currently in use. In particular, two alternative nonpa
[卷]:1001a
[ISBN]:0-8194-0036-X
[会议名称]:Visual Communications and Image Processing'88
[会议时间]:9-11 November 1988
[会议信息]:ISBN:0-8194-0036-X, 9-11 November 1988; Cambridge , Massachusetts
[总页数]:6


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[唯一标识符]:CDSITC.AEROSPACE.N93-31166
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1993-31166; Reference AN: N93-31166
[标题]:HELAS: HELicity amplitude subroutines for Feynman diagram evaluations
[作者]:MURAYAMA H; WATANABE I; HAGIWARA K
[文摘]:HELAS is a set of the FORTRAN 77 subroutines which enables us to compute the helicity amplitude of an arbitrary tree level Feynman diagram with a simple sequence of CALL SUBROUTINE statements. It is easy to write down a FORTRAN program to calculate the helicity amplitude of a given process by calling the HELAS subroutines. The example of evaluating the helicity amplitude of the process W(sup +)W(sup -) yields t(anti-t) is shown. The compactness of the helicity amplitude programs is the main advantage of using the HELAS. Another advantage is that it is very easy to allow external heavy particles to decay into light quarks and leptons without losing the spin correlation. The procedure of calculating the cross section of an arbitrary process with the help of the HELAS and noteworthy characteristics of the HELAS system are shown. How to use the HELAS package is explained about the above example. The HELAS subroutines are grouped in wave functions, nine vertices and tools and standard model coupling constants. HELAS CHECK messages makes the job of finding mistakes easy. (DOE)
[关键词]:APPLICATIONS PROGRAMS COMPUTERS; FEYNMAN DIAGRAMS; RADIOACTIVE DECAY; SUBROUTINES ; FORTRAN ; LEPTONS ; QUARKS ; WAVE FUNCTIONS
[出版年份]:1992
[专业领域]:THEORETICAL MATHEMATICS
[文献类型]:科技报告
[标题]:Four Dimensional Studies in Earth Space.
[作者]:mather, r. s.
[机构]:National Aeronautics and Space Administration. Goddard Space Flight Center,Greenbelt,Md.
[关键词]:earth (planet),gravitational fields,reference systems,geophysics,variations,
[出版年份]:1972
[报告号]:NASA-TM-X-65958, X-553-72-230
[报告时间]:Jul 72,
[页码]:29p
[馆藏索取号]:N72-28352
[总页数]:31



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