منابع مشابه
Constraints on D′′ structure using PKP(AB–DF), PKP(BC–DF) and PcP–P traveltime data from broad-band records
S U M M A R Y The effects of complex structure in the deep mantle and D′′ on PKP differential traveltimes should be estimated accurately in order to reach reliable conclusions concerning the physical and chemical properties of the Earth’s inner and outer core. In particular, it is important to assess how much of the data can be explained by mantle structure alone. For this purpose, we have asse...
متن کاملCryptanalysis of PKP: A New Approach
Quite recently, in [4], a new time-memory tradeoff algorithm was presented. The original goal of this algorithm was to count the number of points on an elliptic curve, however, the authors claimed that their approach could be applied to other problems. In this paper, we describe such an application and show a new way to attack the Permuted Kernel Problem. This new method is faster than any prev...
متن کاملTime dependence of PKP(BC)–PKP(DF) times: could this be an artifact of systematic earthquake mislocations?
Differential inner core rotation was first detected from time-dependent observations of differential travel times between PKP(DF) waves (which go through the inner core) and PKP(BC) waves (which turn at the bottom of the outer core) (Song and Richards, 1996). Criticisms concerning the reported detection have been raised, the most significant one being the possible bias from potential systematic...
متن کاملA new P-velocity model for the Tethyan margin from a scaled S-velocity model and the inversion of P- and PKP-delay times
0031-9201/$ see front matter 2012 Elsevier B.V. A http://dx.doi.org/10.1016/j.pepi.2012.08.005 ⇑ Corresponding author. Address: School of Environm East Anglia, Norwich, Norfolk NR4 7TJ, UK. E-mail addresses: [email protected], Sun Chang). We estimate a 3D P-velocity model for the Tethyan margin by inverting Pand PKP-delay times. The inversion is relative to a 3D reference model, which is...
متن کاملAnalysis of Some Natural Variants of the PKP Algorithm
In 1989, (Shamir, 1989) proposed a new zero-knowledge identification scheme based on a NP-complete problem called PKP for Permuted Kernel Problem. For a given prime p, a given matrix A and a given vector V , the problem is to find a permutation π such that the permuted vector Vπ verifies A ·Vπ = 0 mod p. This scheme is still in 2011 known as one of the most efficient identification scheme based...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1984
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1984.tb01933.x