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Application of the CLEAN Algorithm to Three Dimensional Coded Aperture Imaging

Byard, Kevin - 2020

An iterative technique for the removal of artifacts caused by the near field effects of a coded aperture imaging system is presented. The technique, we we call z-Clean, first locates high energy sources within a three dimensional field of view using a least squares method and then removes the...

Persistent link: https://www.econbiz.de/10012624308

Asymptotics for spectral regularization estimators in statistical inverse problems

Bissantz, Nicolai; Holzmann, Hajo - In: Computational Statistics 28 (2013) 2, pp. 435-453

While optimal rates of convergence in L <Subscript>2</Subscript> for spectral regularization estimators in statistical inverse problems have been much studied, the pointwise asymptotics for these estimators have received very little consideration. Here, we briefly discuss asymptotic expressions for bias and variance...</subscript>

Persistent link: https://www.econbiz.de/10010998462

Continuum reconstruction of the pore scale microstructure for Fontainebleau sandstone

Latief, F.D.E.; Biswal, B.; Fauzi, U.; Hilfer, R. - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 8, pp. 1607-1618

A stochastic geometrical modeling technique is used to reconstruct a laboratory scale Fontainebleau sandstone with a sidelength of 1.5 cm. The model reconstruction is based on crystallite properties and diagenetic parameters determined from two-dimensional images. The three-dimensional pore...

Persistent link: https://www.econbiz.de/10011058457

The variation of b-value of earthquakes during COVID-19 lockdowns : case studies from the Cascadia Subduction Zone and New Zealand

Chatterjee, Avigyan; Saxena, Arushi; Aslam, Khurram; … - In: Journal of information & knowledge management : JIKM 21 (2022) 1, pp. 2240001-1-2240001-13

Persistent link: https://www.econbiz.de/10013269823

Mapping of seismic parameters of the Iberian Peninsula by means of a geographic information system

Amaro-Mellado, J. L.; Morales-Esteban, A.; … - In: Central European journal of operations research : CEJOR … 26 (2018) 3, pp. 739-758

Persistent link: https://www.econbiz.de/10011898507

Properties of the aftershocks sequences of the 2000 and 2002 earthquakes in Aksehir-Afyon graben, west-central Anatolia, Turkey

Ozer, Naside; Altinok, Yildiz; Ceylan, Savas - In: Natural Hazards 40 (2007) 3, pp. 553-562

describes the decay rate of aftershock activity, were investigated for more than 500 aftershocks in the Aksehir-Afyon graben … the Kandilli Observatory’s catalog, which contains records of aftershocks with magnitudes ≥2.5. For the Çobanlar … aftershocks of the Sultandagi earthquake have a high p-value, indicating fast decay of the aftershock activity. A regular increase …

Persistent link: https://www.econbiz.de/10010996349

Crustal Seismicity In and Around Turkey

Yilmaztürk, Ahmet; Bayrak, Yusuf; ÇAKIR, ÖZCAN - In: Natural Hazards 18 (1998) 3, pp. 253-267

Vertical and horizontal variations of the frequency of crustal earthquakes (h ≤ 35 km) that have occurred in and around Turkey are analyzed, using data from the Global Hypocenter Data Base and the IRIS data for the period 1964–1998. Fits of various magnitude scales to the observations have...

Persistent link: https://www.econbiz.de/10010996558

Detection of quarry and mine blast contamination in European regional catalogues

Gulia, Laura - In: Natural Hazards 53 (2010) 2, pp. 229-249

The presence of quarry and mine blasts in seismic catalogues is detected using the Wiemer and Baer (Bull Seism Soc Am 90(2):525–530, <CitationRef CitationID="CR70">2000</CitationRef>) algorithm. The procedure is based on the observation that quarry blasts generally take place during daytime hours: the areas with a high ratio of daytime...</citationref>

Persistent link: https://www.econbiz.de/10010997023

Variation dynamics of the complex topology of a seismicity network

Chiao, Ling-Yun - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 3, pp. 497-507

Reduction in the scaling exponent of the frequency–magnitude power law of regional seismic activity as a precursor to sizable earthquakes has been widely documented and debated. Recently, postulation based on a modified sand-pile model has been proposed as a plausible explanation. The model...

Persistent link: https://www.econbiz.de/10010874507

Precursory phenomena associated with large avalanches in the long-range connective sandpile (LRCS) model

Lee, Ya-Ting; Chen, Chien-chih; Chang, Young-Fo; Chiao, … - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 21, pp. 5263-5270

Reduction in b-values before a large earthquake is a very popular topic for discussion. This study proposes an alternative sandpile model being able to demonstrate reduction in scaling exponents before large events through adaptable long-range connections. The distant connection between two...

Persistent link: https://www.econbiz.de/10010588699