Nanostructuring of a Surface Layer as a Way to Improve the Mechanical Properties of Hypoeutectic Silumin

The irradiation of hypoeutectic silumin 383.1 with an intense pulsed electron beam in the melting mode and rapid crystallization of the surface layer has been performed. A multiphase submicron nanostructured surface layer with a thickness of up to 70 nm has been formed. Mechanical tests of the irradiated silumin samples in tensile experiments have been carried out. A significant increase in strength and plastic properties of silumin irradiated with an electron beam has been established. Features and patterns in the distribution of displacement fields in the deformation process in surface layers of the samples in realtime have been identified by digital image correlation method using the optical measuring system VIC-3D

Nanostructuring of a Surface Layer as a Way to Improve the Mechanical Properties of Hypoeutectic Silumin

The irradiation of hypoeutectic silumin 383.1 with an intense pulsed electron beam in the melting mode and rapid crystallization of the surface layer has been performed. A multiphase submicron nanostructured surface layer with a thickness of up to 70 nm has been formed. Mechanical tests of the irradiated silumin samples in tensile experiments have been carried out. A significant increase in strength and plastic properties of silumin irradiated with an electron beam has been established. Features and patterns in the distribution of displacement fields in the deformation process in surface layers of the samples in realtime have been identified by digital image correlation method using the optical measuring system VIC-3D

Intelligent Active-adaptive Power System of Industrial Enterprises

Intelligent active-adaptive power system of industrial enterprises is presented in this paper. The main elements of this system and active-adaptive principle of interaction between them are detected. The functional assignment of each element of proposed intelligent active-adaptive power system are described. The basic structure and control arrangement of proposed intelligent activeadaptive power system are presented and justified. The influence of proposed intelligent activeadaptive power system on the level of energy saving and efficiency are shown. The practical application of some main elements of proposed intelligent active-adaptive power system are described

Operation of a traction machine’s wheel mover with a locked asymmetrical balance bar

The problems of determining the parameters of a traction machine’s wheel mover with a locked asymmetrical balance bar operation, taking into account the kinematic mismatch arising from the redistribution of the vertical reactions at the driving wheels due to off-center pushing force, have been considered. An algorithm for calculating traction and braking forces, as well as drive wheels’ slippage and skid of an asymmetric balance bar based on their traction balance and the condition of equal actual speeds under a variable vertical load, have been presented. As a result of research it has been found that the greatest additional loads in the drive and tire wear of the wheel mover with a locked asymmetric balance bar will occur when it moves in transport mode on a support surface with high traction properties

Study of macroplastic flow in surface layers of porous SHS-TiNi by digital image correlation

In this work, we studied the evolution and features of localized strain fields in porous SHS-TiNi samples. Using the Vic-3D optical system and spayed speckle patterns, a localized plastic flow on the surface of porous plates of 0.85 mm and 2.7 mm thick loaded up to fracture in a quasi-static mode was traced and characterized. As seen, a 0.85 mm thick specimen indicated two strain-hardening distinctive parts in the stress-strain curve. Moreover, regions of localized strain are found that be wider than that of a 2.7 mm thick sample. It can be argued that by combining speckle patterns and quasi-static tension, one can effectively explore and predict the deformation behavior of a designing bone substitute made of porous SHS-TiNi

Treatment of insomnia in veterans with trauma-related disorders: a brief group cognitive-behavioral intervention

Estimates of insomnia prevalence among people with Posttraumatic Stress Disorder (PTSD) range from 40% to 87%. Initial research findings suggest that PTSD treatments, without targeted insomnia interventions, do not appear to address sleep disruption sufficiently. Cognitive behavioral therapy for insomnia (CBT-I) has shown promising effectiveness in PTSD populations. The current study evaluated CBT-I with a brief group treatment approach, which is consistent with the model of care most commonly implemented by Veterans Affairs (VA) Medical Centers. Participants were veterans with trauma-related disorders recruited from two VA Medical Centers. Random assignment was used to divide participants between a CBT-I group and a treatment-as-usual waitlist control group. Participants in the CBT-I group received four 60-minute weekly group sessions. The CBT-I treatment included stimulus control, sleep hygiene instructions, passive muscle relaxation, and sleep education. Validated measures of sleep and daytime functioning were used to evaluate treatment effects. Data from 65 participants were evaluated using mixed design repeated measures analyses. The results showed that participants who received the CBT-I intervention had greater improvements in sleep efficiency as measured by a sleep diary than participants in the waitlist control group. Sleep questionnaire data and daytime functioning outcomes did not differ significantly between the treatment and waitlist groups. Problems related to participant attrition and missing data were limitations in this study. Implications for future research and clinical implementation of insomnia treatment with veterans are discussed. (Published By University of Alabama Libraries

Influence of Zr-1 wt.% Nb alloy structure state on its deformation and thermal behavior under quasi-static tension

The influence of the average size of the structure elements on the deformation and thermal behavior of the Zr-1 wt.% Nb (Zr1-Nb) alloy under quasi-static tension was investigated using the digital image correlation and infrared thermography methods. It is shown that with increasing average size of the structural elements in the range 0.2–2.0 mm the physico-mechanical properties, such as yield strength, microhardness, maximal true strain, and maximal temperature increment during deformation decrease, while longitudinal and transverse strain increase. According to the obtained results, correlations between the mentioned deformation characteristics and the average size of the structural element d–1/2 can be described by linear functions