The aim of this work is an investigation of structure and martensitic transformation in bimetal composite 'TiNi-stainless steel' produced by explosion welding. The results have shown that the mixture of chemical elements is observed in very narrow intervals of 6 mm close to the joint -2 mm from the TiNi side and 4 mm from the steel one. Micro-hardness distribution in the vicinity of the joint is non-monotonic in the interval of 60 mm. Connection of stainless steel and TiNi plates by explosion welding leads to a dramatic change of martensitic transformation kinetics. Temperatures and the temperature interval of phase transformation increase strongly and heat transformation decreases. Annealing at 500 C for 2 h of bimetal composite decreases the interval of micro-hardness variation and partially recovers kinetics of phase transitions.
The article describes a computer modeling technique that allows predicting the development of restenosis of the internal carotid artery after carotid endarterectomy (CEE). A clinical case has been demonstrated that proves the effectiveness of the developed method. It is indicated that for the correct formation of the geometric model, data from multispiral computed tomography with angiography of the patient after CEE with a layer thickness of 0.6 mm and a current of 355 mA are required. To build a flow model, data of color duplex scanning in three sections are required: 1. In the proximal section of the common carotid artery (3 cm proximal to the bifurcation); 2. In the section of the external carotid artery, 2 cm distal to the carotid sinus; 3. In the section of the internal carotid artery, 2 cm distal to the carotid sinus. The result of computer calculations using specialized software (Sim Vascular, Python, Open Foam) is a mathematical model of blood flow in a vessel. It is an array of calculated data describing the speed and other characteristics of the flow at each point of the artery. Based on the analysis of RRT and TAWSS indicators, a computer model of bifurcation is formed, which makes it possible to predict areas of increased risk of restenosis development. Thus, the developed technique is able to identify a cohort of patients after CEE, subjected to a high probability of loss of the vessel lumen. Such an opportunity will provide a more precise supervision of these patients in the postoperative period with the aim of early diagnosis of restenosis and timely prevention of the development of adverse cardiovascular events.
The addition of peptlzers and surfactants in optimal amounts makes it possible to reduce the moisture content of the suspensions by 10-15% and thereby to increase the efficiency of the technological process.One of the most important properties of the refractories used in the lining of metallurgical plants is wettability by molten metals and slags. Wetting in equilibrium conditions is characterized by an equilibrium wetting angle 8o [i, 2].The equilibrium wetting angles in the system of refractory--slag melt establish themselves slowly because of the multiformity of the processes involved (spreading, permeation, reciprocal diffusion, solution, etc.) and are near zero. A study of wetting in these systems therefore presents difficulties.
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