Wear Resistance of Carbide and Boride Coatings on U8A Steel

Wear resistance measurements have been made with U8A steel bearing protective coatings based on the carbides of titanium, vanadium, and chromium or iron borides, for various forms of wear. The carbide and boride coatings raise the wear resistance considerably (by factors of 6-30 in accordance with the type of wear). Measurements have been made on the microhardness, microbrittleness, and adhesion of the coating to the substrate, which are effective characteristics that quite fully reflect the effects of the microhardness and state of stress, structure, and defectiveness on the wear resistance.     

Excitation loss of open resonators

Reported here are the results on level and structure of the radiated field of an open resonator at and off resonance. On the basis of the modelling problem rigorous solution and the measurements at 4-millimeter wavelength we find there are no ways to compensate the radiated field from an open electromagnetic structure at resonance. Analysis of open resonator excitation efficiency shows that the mismatch loss of a slot-fed open resonator runs to 34% while at the aperture-feed excitation this is not more than 6% for the same-geometry resonator.     

Automatic generation of parallel programs for mimd computer systems

Conclusion The use of linear-time automatic algorithms for sequential program parallelization substantially expands the scope of MCS. Parallel implementation is justified from time considerations even when the application program is executed only a few times without modification (only once when the macrooperation system is introduced), i.e., for frequently reprogrammed jobs. Only linear-time parallel-branch algorithms ensure that the execution frequency of the application program that justifies parallel implementation is independent of the number of statements in the program and allow the size (computational complexity) of the macrooperations treated as parallelization units to be varied between wide limits both in the direction of greater aggregation and in the direction of refinement. At the same time, the linear-time parallel-program generation algorithms proposed in this paper produce programs of acceptable quality. Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 170–179, September–October, 1995.     

Highly reliable energy-efficient glass coatings for pipes transporting energy carriers, liquids, and gases

Comparative characteristics of known materials which are used to increase the longevity of steel pipes are presented. It is shown that glass enamel coatings provide effective protection from corrosion. The physical and technological characteristics of fused frits (water resistance, impact strength, microhardness) fall within the GOST 24405-80 limits. __________ Translated from Steklo i Keramika, No. 3, pp. 23–25, March, 2007.     

Identification and resolution of conflicts during ontological integration using rules

Abstract: Integration of ontologies of information sources and consumers is an important phase in achieving web‐based interoperability. The present work describes an approach for identifying certain semantic conflicts while integrating ontologies of heterogeneous information sources. This paper is focused on the identification of homonymy and synonymy between elements in ontologies. In the present work the concepts of homonymy and synonymy are synonymous to naming conflicts and entity identifier conflicts, respectively, and partial synonymy is synonymous to schema isomorphism conflicts. The concept of the mask of interoperability is introduced for the identification of synonymy. The mask of interoperability is expressed in a declarative way as a set of rules, which can then be used for resolution of conflicts during integration of ontologies. As proof of concept, ontologies are implemented using the XML‐based ontology language Ontology Web Language (OWL), and the rules are implemented using the emerging rule language Semantic Web Rule Language (SWRL). This representation in OWL and SWRL allows the ontology to be executable, flexibly extendable and platform‐independent. The OWL facts and SWRL rules are used by the Jess and Bossam reasoning engine to identify semantic homonymy and synonymy.     

Changes in Structure and Physicochemical Properties of Spark Coatings Based on TiN and TiB2 after Treatment with Concentrated Solar Radiation

Studies have been made on the structure and properties of spark coatings made of TiN and TiB₂ on steel U8 after treatment with concentrated solar radiation. It is found that the absorption capacity of the steel raised by a factor 2–3. The concentrated radiation reduces the coefficient of friction of the spark coatings made of TiN and TiB₂ by a factor 1.4, while the wear rate is reduced by a factor 1.6–2 by comparison with the untreated material. __________ Translated from Poroshkovaya Metallurgiya, Nos. 7–8(444), pp. 64–69, July–August, 2005.     

Stealthiness of analytical chaotic signals

This paper considers an approach to constructing analytical chaotic sequences with statistical and dynamic characteristics that are close to the white noise characteristics. The notion of stealthiness and its measure were introduced for these sequences. Attractors of constructed sequences and their cross-correlation functions were studied. The results obtained in this paper can be used for enhancing the stealthiness of radio data transmission systems.     

Method of image filtering using singular decomposition and the surrogate data technology

A method for nonlinear filtering of additive noise on digital image has been proposed. This method is based on presenting the image by its matrix singular decomposition and applying the surrogate data technology to components of the image. The proposed method ensures a superior resolution as compared to most common methods of window filtering that is corroborated by the results of simulation modeling.     

Live Migration Schemes in Data Centers

Programming and Computer Software - This paper describes some live virtual machine (VM) migration schemes used in modern hypervisors and provides a comparative analysis of their potential...