Contextual void patching for digital elevation models

Digital terrain models can be created by gathering a set of measurements from geometric objects. For various reasons, these models may be incomplete and thus fail to meet the requirements defined by their potential applications. In this work, we develop a novel multiresolution approach to repair the voids commonly found in digital elevation models (DEM). We use the overall shape and structure of the surrounding terrain to build a smooth patch for the void. Then, using a multiresolution approach obtained from reverse Chaikin subdivision, we extract the low-scale characteristics from the surrounding terrain and apply them to the smooth patch. The results demonstrate that our approach is effective in synthesizing models with realistic characteristics.     

Zinc Diffusion into InP via a Narrow Gap from a Planar Zn<Subscript>3</Subscript>P<Subscript>2</Subscript>-Based Source

An original technology of zinc diffusion into InP via a narrow gap is described, which allows reproducible formation of p–n junctions with preset depth of doping and retained surface morphology of the doped layers. Using the proposed method, desired charge carrier distribution profiles in Zn-doped InP layers were obtained. It has been experimentally confirmed that the method of cross-sectional scanning electron microscopy allows to precision measure of the zinc diffusion depth.     

Phase equilibria in the system LaMnO3 + δ-SrMnO3-LaFeO3-SrFeO3 − d

We have revealed the formation of a continuous series of orthorhombic LaMn_{1 ? y} Fe_yO₃ solid solutions (0<y<1); La_{1 ? x} Sr_xFeO₃ solid solutions in the composition range 0 < x ≤ 0.8, with an orthorhombic structure at 0 < x ≤ 0.6 and a cubic structure at 0.6 < x ≤ 0.8; and a tetragonal SrMn_{1 ? y} Fe_yO₃ phase in the range 0.6 ≤ y ≤ 1. The composition stability limits of the perovskite phase La_{1 ? x} Sr_xMn_{1 ? y} Fe_yO₃ have been determined, and the 1100°C isotherm of the La₂O₃-SrO-Mn₃O₄-Fe₂O₃ system in air has been constructed.     

Spatial consistency of dense features within interest regions for efficient landmark recognition

Recently, feature grouping has been proposed as a method for improving retrieval results for logos and web images. This relies on the idea that a group of features matching over a local region in an image is more discriminative than a single feature match. In this paper, we evolve this concept further and apply it to the more challenging task of landmark recognition. We propose a novel combination of dense sampling of SIFT features with interest regions which represent the more salient parts of the image in greater detail. In place of conventional dense sampling used in category recognition that computes features on a regular grid at a number of fixed scales, we allow the sampling density and scale to vary based on the scale of the interest region. We develop new techniques for exploring stronger geometric constraints inside the feature groups and computing the match score. The spatial information is stored efficiently in an inverted index structure. The proposed approach considers part-based matching of interest regions instead of matching entire images using a histogram under bag-of-words. This helps reducing the influence of background clutter and works better under occlusion. Experiments reveal that directing more attention to the salient regions of the image and applying proposed geometric constraints helps in vastly improving recognition rates for reasonable vocabulary sizes.     

Implementation features a university data portal using the Semantic Web technology

The paper describes realization of a university information storage and retrieval system using Semantic Web technology. A portal is designed on the base of the Research Institute platform provided by the Russian Academy of Sciences. The subject domain ontology developed by the author, the system architecture, its resources and services are described.     

Production of Carbon Materials with Specified Porosity

The results of studies on the oxidation of carbon black are represented. It was found that materials with different porosity can be obtained by varying the nature of an activating agent and the conditions of activation. A correlation of the sizes of carbon crystallites in the initial sample, the extent of their boundaries, and the rates of pyrocompaction and oxidation of these samples with the specific surface area of materials obtained upon activation was established.     

Interferon production using the peripheral leukocytes of leukemic children

Interferon production by blood leucocytes was investigated in 26 children with various types of leukemia (acute lymphoblastic, acute myeloblastic and the blastic crisis of chronic myelocytic leukemia). The control group consisted of 6 children with lymphoadenopathy. Interferon synthesis was decreased in most cases of acute lymphoblastic leukemia. The persistent sharp reduction of interferon producing function of leucocytes is a factor of unfavourable prognosis in acute lymphoblastic leukemia of children, being associated with a more severe course of the disease, increased susceptibility to viral infection, and with a higher risk of relapse. In two cases of chronic myelocytic leukemia the level of interferon production was equal to or even higher than in the control group. It is supposed that the estimation of interferon production by leucocytes can be used as an additional factor in the differential diagnostics of obscure cases of children leukemia.     

Low-Frequency Dielectric Relaxation near the Curie Temperature in Triglycine Sulfate Crystals Containing Radiation-Induced Defects and α-Alanine Impurity

The dielectric properties of a polydomain triglycine sulfate (TGS) crystal near the Curie temperature (20 Hz to 20 kHz) were compared with those of monodomain crystals (containing -alanine impurity or gamma-irradiated). The frequency and temperature dependences of ac conductivity were used to assess its effect on the dielectric properties of TGS nearT _C. The crystals were found to differ in the variation of the real part of permittivity with temperature, which was tentatively attributed to the difference in the density of domain walls in the paraelectric phase near T _C.     

Contact friction in the deformation zone during ultrasonic surface plastic deformation

It is shown that the introduction of torsional ultrasonic oscillations in the deformation source reduces the work of the frictional forces in comparison with the application of radial and longitudinal ultrasound or the absence of ultrasound. The application of torsional ultrasound to the deforming element reduces the contact-friction coefficient by a factor of 20–60, as against a factor of two or less when radial and longitudinal ultrasound is applied to the contact zone. With increase in the rolling rate and decrease in oscillation amplitude of the deforming element, the effectiveness of ultrasound application declines.