The destructive mechanisms in high-strength steels under the effect of impurities

An increase in the strength of the existing high-strength medium-carbon steels is accompanied by a decrease in their ductility and plasticity, which reduces the reliability of structures from these materials and limits the possibility of decreasing the mass of aircraft parts and raising their efficiency. A way to improve the ductility parameters of steels consists of decreasing the content of impurities in them. In order to correctly ascertain the admissible content of impurities and estimate their effect on the properties of steels, we should study the mechanism of the influence of impurities on the destruction processes in high-strength medium-carbon steels. It is a common practice to associate the effect of impurities with the reversible temper brittleness.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 15–19, January, 1995.     

Vibration molding of chamotte products of complex shapes

Conclusions Vibration molding makes the mechanization of the manufacture of chamotte products of complex shape possible with the result that labor productivity increases, the drying process is simplified, the working conditions are improved and the product quality is better.Translated from Ogneupory, No. 6, pp. 31–34, June, 1978.     

Corrosion-Resistant High-Temperature Alloys for Large Single-Crystal Turbine Blades

Corrosion-resistant castable high-temperature alloys with properties close to those of alloys with directed structure used for casting vanes of aircraft gas turbine engines and the process of casting of large single-crystal turbine blades of stationary gas turbine units are described. These alloys and the casting process are used to develop a new generation of gas turbine engines and units.     

Team VALOR's ESCHER: A Novel Electromechanical Biped for the DARPA Robotics Challenge

The Electric Series Compliant Humanoid for Emergency Response (ESCHER) platform represents the culmination of four years of development at Virginia Tech to produce a full‐sized force‐controlled humanoid robot capable of operating in unstructured environments. ESCHER's locomotion capability was demonstrated at the DARPA Robotics Challenge (DRC) Finals when it successfully navigated the 61 m loose dirt course. Team VALOR, a Track A team, developed ESCHER leveraging and improving upon bipedal humanoid technologies implemented in previous research efforts, specifically for traversing uneven terrain and sustained untethered operation. This paper presents the hardware platform, software, and control systems developed to field ESCHER at the DRC Finals. ESCHER's unique features include custom linear series elastic actuators in both single and dual actuator configurations and a whole‐body control framework supporting compliant locomotion across variable and shifting terrain. A high‐level software system designed using the robot operating system integrated various open‐source packages and interfaced with the existing whole‐body motion controller. The paper discusses a detailed analysis of challenges encountered during the competition, along with lessons learned that are critical for transitioning research contributions to a fielded robot. Empirical data collected before, during, and after the DRC Finals validate ESCHER's performance in fielded environments.     

The Methodology of Application Development for Hybrid Architectures

This paper provides an overview of the main recommendations and approaches of the methodology on parallel computation application development for hybrid structures. This methodology was developed within the master＇s thesis project ＂Optimization of complex tasks＇ computation on hybrid distributed computational structures＂ accomplished by Orekhov during which the main research objective was the determination of＂ patterns of the behavior of scaling efficiency and other parameters which define performance of different algorithms＇ implementations executed on hybrid distributed computational structures. Major outcomes and dependencies obtained within the master＇s thesis project were formed into a methodology which covers the problems of applications based on parallel computations and describes the process of its development in details, offering easy ways of avoiding potentially crucial problems. The paper is backed by the real-life examples such as clustering algorithms instead of artificial benchmarks.