Materials Literature
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Although the 6150 steel has an excellent fatigue and impact resistance, it is unsuitable to operate it when the corrosion is a limited factor. We propose here a sequence of steel pre-treatment by carburizing, carbonitriding and nitriding in order to improve the poor adhesion between Diamond Like-Carbon coatings on ste…
The method Baumann, or sulphur print as it is also known, is one of the tools used to evaluate the operating conditions of continuous casting machine and quality control of material produced. The internal defects analyzed in sulphur print are traditionally classified manually by comparing sample results with predefine…
This study evaluates the relationship of the bentonite content and hydraulic conductivity coefficient (k) of waste foundry sands in tests of hydraulic conductivity in a flexible wall permeameter. The test samples had concentrations of activated sodium bentonite and natural sodium bentonite between 4% and 15%. It was a…
For this study, ASTM C 452-68 testing was conducted for two years on 54 POZC-silica fume (SF) or diatomites (D and N) (=Z pozzolans), were tested for 2 years, by ASTM C 452-68 method, having determined to their specimens their Vcl(=ΔL(%)/day) . The results have borne out that the pozzolanic reactions from SiO2r- of th…
In light of their excellent mechanical properties and other advantages over conventional systems for repairing and rehabilitating structures, fibre-reinforced polymers (FRPs) are commonly used to enhance the shear strength of RC members. Because of the relatively recent application of the technique in civil engineerin…
The present work is part of a research program that aims to evaluate the technical feasibility of increasing productivity in the manufacturing of tubular components for offshore oil industry, which are fully welded by automatic submerged arc welding process, with high heat input, but with no impairment on the impact t…
Friction spot welding (FSpW) is one of the most recently developed solid state joining technologies. In this work, based on former publications, a computer aided draft and engineering resource is used to model a FSpW joint on AZ31 magnesium alloy sheets and subsequently submit the assembly to a typical shear test load…
editorial
The problem on the corporate culture development needed to achieve the strategic and social goals in the higher educational institution is considered. The corporate culture development within the frame of the quality management system (QMS) building is one of the optimal solution approaches to the problem. The key ele…
Each society is faced with the decision of how to provide the well-being and high quality of life of its citizens best. Increasingly, cities, states, and nations are turning to tourism as an important element in their economic portfolio as they recognize the potentially significant economic rewards at stake. Much of t…
The problem on the dynamic configuration of the diamond smoothing through the vibroacoustic emission signal control accompanying processing is considered. The dynamic equations based on the analysis which shows that the changes of the gradient mechanical-and-physical properties on the workpiece surface lead to the cha…
Actually, the water movement in the ‘soil-plant-atmosphere’ system is quite well studied. The main part of the ascending water in the plant goes through the xylem vessels. Higher plant xylem is a complex structure. To represent it as a set of ordinary vertical tubes is incorrect. Judging by the distribution model of f…
The axially symmetric quasistatic problem on thermoelasticity for the functionally graded half-space, with elasticity modulus, Poisson ratio, heat conduction, and linear expansion coefficients varying continuously in the near-surface layer is considered. It is supposed that the area in the circle with the known radius…
The article is intended to cover the new strategies to individual activity of students dealing with the self-management of study process organization providing quality higher education, strengthening mobility for better learning in the framework of competence/learning outcome-based, student-centered approaches to lear…
The theoretical studies on noise levels under hardening the surface layers of the helicopter spar pipes through the centrifugal processing are resulted. Spar is considered as a two-point article subjected to the periodic impulse force impact. The calculated relation is obtained for detecting the sound pressure levels…
The production method is worked out, and the technical solutions to the rotary internal soil mulching are proposed. On the basis of the long-term stationary studies, the synthesis problem on a new soil quality is solved. The goal of these investigations is the creation of the long-term optimal launch growing condition…
To improve the steam quality control and the process of its generation, to prevent the off-design behavior of the water thermal treatment plants of the TPP, CHPP, and NPP, the techniques and devices for their implementation are developed. They are designed for the operational conductometric quality control of the stea…
Some issues on the risk management regarding the operation safety at the engineering enterprises are considered. The expert survey technique on the risk assessment for the mechanical engineering enterprises, and the training set are developed. The neuronet operation should be adjusted to satisfy the expert council qua…
A mathematical model of the wheel — road surface interaction is presented. This model permits to carry out a qualitative investigation on the wheel swing specificity in a coupling case. The experimental investigation is implemented through the numerical modeling methods. In the obtained mathematical model, it is assum…
The international scientific-research MAAT (Multibody Advanced Airship for Transport) project supported by the European Union on the Seventh framework program solves the global problem on the ecologically safe transportation. One of its sections has the aim to research the aerodynamics of the specialized high-altitude…