The wireframe modeling in for the geometric representation of a part in a cad system

In the article describes several options for the geometric representation of a part in a CAD system. The choice of one or another option depends on the capabilities of the system and on the need for its application to create a control program. Not so long ago, the kulman was the main tool of the design engineer. With the advent of the first personal computers, a real revolution began in the field of design automation. Design engineers immediately appreciated the benefits of "flat scriber." Even the simplest CAD system for two-dimensional design allows you to quickly create various geometric elements, copy fragments, automatically apply hatching and affix dimensions. The main tools in flat design are lines, arcs, and curves. Using the operations of extension, cropping and joining of geometric elements, the creation of an “electronic drawing” takes place. For full-fledged work with flat graphics in the CAM system, additional information on the depth of geometry is needed. The wireframe model represents the geometry of the part in three-dimensional space, describing the position of its contours and faces

The integrated method to select drilling muds for abnormally high pressure formations

The article describes the method for choosing a drilling mud for drilling abnormally high pressure formations. A carefully selected drilling mud formulation would not only enhance an array of interrelated fluid properties, but also minimize the impact on the pay zones when the drill bit first penetrates the pay. To ensure a better assessment of drilling mud impact on the pay zone, it is reasonable to carry out the study focused on the analysis of technological parameters, involving filtration, acid and drilling mud tests, as well as formation damage analysis. This would enable evaluating the degree of mudding off, reservoirs acid fracturing effect and the risks of pipe sticking at significant depth. The article presents the results of the above-described study with regard to the currently used drilling mud and new experimental formulations developed at National Research Tomsk Polytechnic University (Drilling Mud and Cement Slurry Laboratory)

LUMINESCENT CHARACTERIZATION OF INTERACTION EFFICIENCY IN THE SYSTEM "CYTISINE - AMINO ACID" AS AN INDICATOR OF ANTI-INFLAMMATORY ACTIVITY

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Specifics of the physicochemical properties of tetramethylurea

The rotational and translational mobility of tetramethylurea molecules over the temperature range 15-60°C was studied using the NMR relaxation and proton spin-echo methods. The activation energies for these motions were calculated. The density, viscosity, isothermal compressibility, and cubic expansivity were determined. A thermogravimetric analysis of the substance was performed. The physicochemical properties of tetramethylurea were compared to those of urea, its other methyl-substituted derivatives, and dimethylformamide. Copyright © 2005 by Pleiades Publishing, Inc

Fractal Pedagogical Principles: Information Models and Evaluation Methods in Teaching “Computer Graphics"

Результатом исследования является усовершенствованная методика проблемного обучения дисциплине «Компьютерная графика» на основе адаптивного уровня теоретических и практических навыков специфических принципов и особенностей преподавания на основе фрактальной структуры; усовершенствованы методы преподавания дисциплины «Компьютерная графика» посредством информационных моделей, основанных на таких принципах фрактальной педагогики как нелинейность, рефлексивное взаимодействие и резонансный подход; усовершенствована методика тестирования при проверке усвоения студентами дисциплины «Компьютерная графика» на основе фрактальной гармонии и иерархических знаний; усовершенствована автоматизированная учебно-информационная система как средство обучения при определении междисциплинарной фрактальной и организационной базы основных понятий по предмету «Компьютерная графика», диагностирования результатов усвоения студентами по данному предмету, выявлении глубины знаний на основе древовидного фрактала и объема учебной деятельности.The purpose of the study is to improve the teaching meth ods of specialized disciplines based on elements of fractal pedagogy and information models (on the example of the subject “Computer Graphics”). The objectives of the research are to analyze the features and principles of fractal pedagogy, to improve the methodology of problem-based learning when teaching specialized subjects; design and development of information models that improve the methods of problem-based learning; development of an algorithm for determining the level of knowledge of students who have mastered the subject, and visualization of this process; offering a means of controlling the process of teaching specialized subjects, monitoring the dynamics of assimilation based on fractal features (using the example of the discipline “Computer Graphics”). The scientific novelty of the research is as follows: the methodology of problem-based teaching of the discipline “Computer Graphics” has been improved on the basis of an adaptive level of theoretical and practical skills of specific principles and features of teaching based on a fractal structure; the methods of teaching the discipline “Computer Graphics” have been improved through information models based on such principles of fractal pedagogy as nonlinearity, reflexive interaction and resonant approach; the testing methodology has been improved when checking students’ assimila tion of the discipline “Computer Graphics” based on fractal harmony and hierarchical knowledge; the automated educational and information system has been improved as a means of teaching in determining the interdisci plinary fractal and organizational base of the basic concepts on the subject of “Computer Graphics”, diagnosing the results of students’ assimilation in this subject, identifying the depth of knowledge based on a tree fractal and the volume of educational activity

Does Research on Nature of Science and Social Justice Intersect? Exploring Theoretical and Practical Convergence for Science Education

Even though enhancement of students’ understanding of social justice is thought to contribute to good citizenship, contextualising social justice in science education remains challenging for teachers because social justice is not conventionally a common feature of science teaching and learning. A separate issue in science education concerns a vast body of work on nature of science (NOS) elated to understanding of and about science. Understanding NOS is thought to contribute to scientific literacy as well as citizenship. Although social justice and NOS literatures share similar themes such as citizenship goals, the precise intersection of these literatures remains relatively understudied. In this chapter, we present an argument about how contemporary conceptualizations of NOS as well as NOS instruction might be used to promote goals related to social justice. In so doing, we aim to contribute to NOS literature by drawing on theories of social justice grounded in political philosophy. We trace the potential overlap of social justice and NOS concepts and draw out example recommendations for curriculum statements and practical teaching as well as practical teaching and learning approaches. Overall, we advocate the promotion of educational goals related to social justice through NOS instruction

Markers of myocardial injury and inflammation after radiofrequency ablation in children and adolescents

Aim. To assess the severity of myocardial damage and inflammation after radiofrequency ablation in children and adolescents using biochemical markers.Material and methods. The study included 58 children with tachyarrhythmias (Wolff-Parkinson-White (WPW) syndrome, WPW phenomenon, atrial tachycardia, paroxysmal atrioventricular reciprocating tachycardia, ventricular tachycardia) who underwent catheter ablation from July to October 2019. Before and after surgical treatment (after 2 hours and 5 days), the blood concentrations of myocardial damage and inflammation biomarkers (myoglobin, creatine phosphokinase-MB, interleukin-8, C-reactive protein, tumor necrosis factor alpha, metalloproteinase (MMP)-2, MMP-9, heart-type fatty acid binding protein). During the operation, catheter ablation parameters (power, temperature, application duration), the localization of arrhythmogenic focus and the type of ablation catheter were recorded. Their relationship with changes in the concentration of biochemical markers before and after intervention was studied.Results. Two hours after the operation, the concentrations of myoglobin, creatine phosphokinase-MB, MMP-9, heart-type fatty acid binding protein were increased several times (p<0,05). Changes in concentrations of interleukin-8, tumor necrosis factor alpha after the operation was not revealed. On the 5th day, elevated levels of cardiac markers returned to baseline values. MMP-9 level also decreased, but was higher than the preoperative level. Using Spearman’s correlation analysis, a direct relationship was revealed between the application duration and heart-type fatty acid binding protein level.Conclusion. Radiofrequency ablation is a safe method of treating arrhythmias in children and adolescents, since there is low volume of damaged myocardium. There was a slight increase in the level of biochemical markers after ablation (myoglobin, creatine phosphokinase-MB, fatty acid binding protein, MMP-9), incomparable with their rise in acute coronary syndrome, as well as the rapid decrease in the early postoperative period