Interferometric methods for suppressing additive noise

Interferometric methods for signal processing, which make it possible to obtain a better noise protection of information laser and optoelectronic systems during detection and processing of optical fields under conditions for external additive noise, are proposed based on the results of analysis of the specific features of field formation in passive and active optical interferometers. The possibility of reducing the effect of external factors on the efficiency of additive-noise suppression by supplementing an interferometer with a stimulated-Brillouin-scattering fiber mirror is investigated. The technical feasibility of the methods proposed is shown and their efficiency is experimentally confirme

Spatial polarimetry of inhomogeneous surfaces under laser illumination

A study aimed at improving the methods of remote laser polarimetry of inhomogeneous surfaces using complex probe signals with a combined amplitude-phase and polarization modulation has been performed. It is shown that the informative properties of probe signals can be improved that potentially allows for carrying out some operations of forming and processing polarization images of objects in the probe stage. The efficiency of application of the proposed probe signals for recognizing various types of materials is experimentally confirme

Optimal processing of noisy images in a photodetector with limited dynamic range

A study aimed at optimizing noisy image processing under conditions of strong additive noise has been performed. An algorithm of optimal signal processing was developed and a possibility of improving image quality due to the subtraction of excess additive noise (which limits the photodetector dynamic range) was substantiated. The possibility of technical implementation of noise subtraction due to forced recombination of charge carriers in the photodetector is experimentally confirmed. The proposed approach to design processing systems makes it possible to improve the quality of recorded images under noisy conditions without any changes in the photodetector desig

Language, Subject, Ideology

<p>In this paper the problem of interdependence between power and language is viewed. The authors point out that the problem may be investigated in two aspects: from the point of view of a conscious use of language as a political instrument and from the point of view of an unconscious dependence of an individual on language and ideology. In this context, the authors investigate the ideas expressed by Louis Althusser and Michel Pźcheux. The theory of Ideological State Apparatuses by Althusser is represented here as one of possible conceptual bases for defining gender distribution of power. In this paper the specificity of the Pźcheux’s  discourse analysis is revealed: discourse is viewed by Pźcheux as a sphere of intersection of language and extra-linguistic restrictions created by ideology.</p><p> </p

Mud volcanoes in the Alboran Sea: evidence from micropaleontological and geophysical data.

25 pages, 9 figures, 9 tables.During the BASACALB-TTR9 cruise of the R/V Professor Logachev (1999), two mud volcanoes (called Marrakech and Granada) were discovered in the southern sector of the mud diapir province in the West Alboran Basin (WAB). This paper presents icropaleontological and geophysical data on these mud volcanoes from gravity core samples, sidescan sonar (OKEAN) images and high-resolution seismic lines. Mud breccia recovered from the Granada mud volcano is matrix-supported with well-consolidated clasts of limestone, marlstone, claystone, siltstone, sandstone and mudstone, whereas mud breccia from the Marrakech mud volcano contains unconsolidated clasts. The mud breccia matrix contains abundant Miocene calcareous nannofossils (CN), together with Pliocene^Pleistocene species and reworked late Cretaceous and Paleocene^Eocene species. CN dating indicates that clasts in the mud breccia derive from late Cretaceous, Paleocene, Eocene, and probable Miocene sediments. These data suggest that the mud diapirs and mud volcanoes in the WAB can be derived from the olistostromes of Unit VI, the basal stratigraphic sequence in the Alboran Sea basin. Unit VIconsists of lower Miocene sediments that incorporated late Cretaceous and Paleocene^Eocene materials and basement-derived rock fragments. The mud volcanic deposits are covered by a thin drape of pelagic marls, suggesting that these two volcanoes are currently inactive. Structures determined on highresolution seismic profiles across mud volcanoes and surrounding diapirs correspond to the late-stage, Pliocene-to- Quaternary diapir development. This stage is thought to have developed during a compressional tectonic setting that produced folding and wrench tectonics throughout the basin. Mud ascent at that time resulted in active diapirism and mud volcanoes on the seafloor.We are grateful to M.K. Ivanov, of the TTR program, for his all-encompassing help. Moreover, we wish to express our gratitude to the BASACALB TTR9 scienti¢c party. We thank referees J.A. Flores, E. De Kaenel, A. Kopf and N. Kenyon for their thoughtful comments and detailed criticism, which helped to clarify the manuscript. We also thank C. Laurin for her careful and detailed linguistic revision. Funding for the BASACALB Cruise and this work was provided by Project REN2001-3868-C03 (MCYT, Spain).Peer reviewe

Interferometric methods for suppressing additive noise

Interferometric methods for signal processing, which make it possible to obtain a better noise protection of information laser and optoelectronic systems during detection and processing of optical fields under conditions for external additive noise, are proposed based on the results of analysis of the specific features of field formation in passive and active optical interferometers. The possibility of reducing the effect of external factors on the efficiency of additive-noise suppression by supplementing an interferometer with a stimulated-Brillouin-scattering fiber mirror is investigated. The technical feasibility of the methods proposed is shown and their efficiency is experimentally confirme

Spatial polarimetry of inhomogeneous surfaces under laser illumination

A study aimed at improving the methods of remote laser polarimetry of inhomogeneous surfaces using complex probe signals with a combined amplitude-phase and polarization modulation has been performed. It is shown that the informative properties of probe signals can be improved that potentially allows for carrying out some operations of forming and processing polarization images of objects in the probe stage. The efficiency of application of the proposed probe signals for recognizing various types of materials is experimentally confirme