Free-surface multiples can be considered to be signal and migrated by the crosscorrelogram migration method (Schuster and Rickett, 2000; Sheng, 2000). By merging the Kirchhoff and crosscorrelogram migration images, the true reflectors can be reinforced and the artifacts can be attenuated. For simple flat layered models direct multiplication of the Kirchhoff and crosscorrelogram migration images...

We describe an undergraduate laboratory experiment on conductance steps observed to occur near integer multiples of 2e/h as nanocontacts form and break between gold wires in loose contact. This experimental arrangement was first described by Costa-Krämer et al. @Surf. Sci. 342, L1144 ~1995!#. A simple op-amp circuit in conjunction with an inexpensive storage oscilloscope suffice to observe the ...

Seismic interferometry allows one to create a virtual source inside a medium, assuming a receiver is present at the position of the virtual source. We discuss a method that creates a virtual source inside a medium from reflection data measured at the surface, without needing a receiver inside the medium and, hence, going beyond seismic interferometry. In addition to the reflection data, an esti...

For vertical-seismic-profiling (VSP) measurements, the use of blended acquisition, with time-overlapping shot records, can greatly reduce the downtime and, thereby, provide large cost savings. For directly imaging blended VSP measurements, we have used full-wavefield migration (FWM). FWM is an inversion-based imaging scheme that enables us to use any kind of complex source wavefield to estimate...

Ware, Chap 10: Interacting with Visualizations. first half, p 317-324 Tufte, Chap 4: Small Multiples State of the Art: Coordinated & Multiple Views in Exploratory Visualization. Jonathan C. Roberts. Proc. Conference on Coordinated & Multiple Views in Exploratory Visualization (CMV) 2007. Building Highly-Coordinated Visualizations In Improvise. Chris Weaver. Proc. InfoVis 2004 Exploring High-D S...

The low weight polynomial multiple problem arises in the context of stream ciphers cryptanalysis and of efficient finite field arithmetic, and is believed to be difficult. It can be formulated as follows: given a polynomial f ∈ F2[X] of degree d, and a bound n, the task is to find a low weight multiple of f of degree at most n. The best algorithm known so far to solve this problem is based on a...

Let P be a d-dimensional lattice polytope. We show that there exists a natural number cd , only depending on d, such that the multiples cP have a unimodular cover for every c ∈ N, c ≥ cd . Actually, an explicit upper bound for cd is provided, together with an analogous result for unimodular covers of rational cones. 1. STATEMENT OF RESULTS All polytopes and cones considered in this paper are as...

Multiples translations can be computed by one machine translation (MT) system or by different MT systems. We may assume that different MT systems make different errors due to using different models, generation strategies, or tweaks. An investigated technique, inherited from automatic speech recognition (ASR), is the so-called system combination that is based on combining the outputs of multiple...

To explore and to compare different revisions of complex software systems is a challenging task as it requires to constantly switch between different revisions and the corresponding information visualization. This paper proposes to combine the concept of small multiples and focus+context techniques for software maps to facilitate the comparison of multiple software map themes and revisions simu...