Finite-element simulation of scratching on a coated brittle plate

This paper presents finite-element simulation of scratching on a brittle plate with functional coating under force loading by a diamond tool. To calculate stresses inside the plate and under the tool tip, a numerical experiment is set up and a parametric task is formulated. The task is solved with use of the ANSYS Programming Dynamic Language. The numerical experiment includes scratching of a silicon wafer by a diamond cutting tool, ZnS as the functional coating and force loading. As a result, internal stresses under the cone tool tip are analyzed, the APDL program is verified, and this allows us to simulate not only silicon wafers, but also any other brittle materials. Scratching is considered as a special case of common cutting. © 2016 Author(s)

Ability of ANSYS/LS-DYNA software for simulation of mechanoprocessing

Рассмотрены функциональные возможности программного комплекса ANSYS/LS-DYNA для моделирования процессов механической обработки конструкционных материалов, а также роль внедрения актуальных компьютерных программ в современном учебном процессе.The paper describes the functionality of the software package ANSYS/LS-DYNA for the structural materials machining simulation, also applying of the new computer programs in the modern educational process have been discussed

Development of innovative leadership potential in education system

The aim of the research is to reveal the educational formation mechanisms of manager personality, including the ability to operate the intellectual capital at all levels of activities, to disclose innovative competence in dealingwith special problems as the regulation of social and organizational processes, to apply knowledge on the management factors efficiency, human needs, attitudes, and modern management techniques. Methods. The research outcomes include the methods of social control organization in the innovation sphere, based on the design of the value system that integrates the intellectual activities of employees into a unified semantic informational space, which promotes the socio-cultural development of various social groups and institutions. Sociological methods of the expert survey in the form of in-depth interviews are applied as an empirical basis of the present study. Cognitive modeling method is used in the course of interpretation and data analysis. The author draws the conclusion using the method of dialectical opposition unity. Results. The research findings demonstrate the characteristics of managers who are good at effective mobilizing the intellectual resources while encouraging the staff members’ capabilities of self-development and self-training. The article deals with the integral indicators of management entity engagement including the arrangement of conditions and interaction system that sustain innovative values updating in some organizations in order to improve organization efficiency in accordance with the stated objectives.Scientific novelty. The author summarizes the theoretical basis of modern means and methods of social institutions management, including educational institutions. General management mechanisms of innovative leadership potential realization are presented in the form of the hierarchic unity. It is shown that intellectualcapital integration into innovative processes of an organization ought to include the creation of an integration system of human, national and organizational values. Intellectual capital is considered as the main subject to management. The author insists on the succession principles observance analyzing the management theories of various intellectual assets and its process of transformations. It is specially noted that the integration of management models based on innovation, and classical resources, allows the development of social controlmethods to minimize the risk in the face of uncertainty, forward the sustainable development of the organization, able to adapt not only dynamic, but also a stable environment. Practical significance. The research outcomes can be used for further development of management training techniques involved in the innovation process, as well as by the managers to improve the methods of updating the intellectual capital of the organization, including educational institutionsЦель работы – раскрыть образовательные механизмы формирования личности управленца, способного оперировать интеллектуальным капиталом на всех уровнях деятельности, использовать инновационные компетентности при регулировании социальных, организационных процессов и при решении нестандартных проблем. Такой специалист должен обладать знаниями о современных методах и факторах эффективного управления, о человеческих потребностях и профессиональных установках. В статье рассматривается инструментарий социального управления организацией в инновационной среде, ядром которого является конструирование системы ценностей, интегрирующей интеллектуальную деятельность сотрудников в единое смысловое информационное пространство, способствующее социокультурному развитию различных социальных групп и институтов. Методы. В качестве эмпирической базы исследования использованы социологические методы экспертного опроса в форме глубинного интервью. В процессе интерпретации и анализа данных применялись методы когнитивного моделирования. Выводы сделаны с опорой на диалектический метод единства противоположностей. Результаты. Выделены характеристики управленцев, способных мобилизовать интеллектуальные кадровые ресурсы организаций, стимулируя при этом потенциал саморазвития и самореализации сотрудников. Предложены интегральные показатели деятельности субъектов управления по созданию условий и системы взаимодействий, способствующих актуализации инновационных ценностей в организации для повышения эффективности ее деятельности в соответствии с поставленными целями. Научная новизна. Предпринята попытка сформулировать теоретические основы современных способов и методов управления социальными институтами, к которым относится и институт образования. Универсальные управленческие механизмы актуализации инновационного потенциала кадров представлены в иерархическом единстве. Показано, что встраивание в инновационные процессы организации ее интеллектуального капитала, который в настоящее время выступает в качестве главного объекта управления, должно происходить через создание интеграционной системы общечеловеческих, национальных и организационных ценностей. Синтезируя теории управления интеллектуальными ресурсами и процессом их трансформации, автор настаивает на соблюдении принципа преемственности научных знаний. Сочетание инновационных и классических моделей управления позволяет в условиях неопределенности минимизировать риски и обеспечить адаптацию и поступательное устойчивое развитие организации не только в стабильной, но и в динамичной среде. Практическая значимость. Материалы статьи могут быть использованы при разработке методик подготовки управленческих кадров, задействованных в инновационных процессах, а также собственно управляющими работниками для совершенствования процесса актуализации интеллектуального капитала в различных, в том числе образовательных учреждения

Computer-aided analysis of cutting processes for brittle materials

This paper is focused on 3D computer simulation of cutting processes for brittle materials and silicon wafers. Computer-aided analysis of wafer scribing and dicing is carried out with the use of the ANSYS CAE (computer-aided engineering) software, and a parametric model of the processes is created by means of the internal ANSYS APDL programming language. Different types of tool tip geometry are analyzed to obtain internal stresses, such as a four-sided pyramid with an included angle of 120° and a tool inclination angle to the normal axis of 15°. The quality of the workpieces after cutting is studied by optical microscopy to verify the FE (finite-element) model. The disruption of the material structure during scribing occurs near the scratch and propagates into the wafer or over its surface at a short range. The deformation area along the scratch looks like a ragged band, but the stress width is rather low. The theory of cutting brittle semiconductor and optical materials is developed on the basis of the advanced theory of metal turning. The fall of stress intensity along the normal on the way from the tip point to the scribe line can be predicted using the developed theory and with the verified FE model. The crystal quality and dimensions of defects are determined by the mechanics of scratching, which depends on the shape of the diamond tip, the scratching direction, the velocity of the cutting tool and applied force loads. The disunity is a rate-sensitive process, and it depends on the cutting thickness. The application of numerical techniques, such as FE analysis, to cutting problems enhances understanding and promotes the further development of existing machining technologies. © 2017 Author(s)

Clinical features of small bowel biliary ileus

The analysis of clinical progression and treatment of gallstone small bowel obstruction in 44 patients is given. The variants of diagnosis and outcomes of operations are presented

Luminescence of Li6Gd(BO3)3 crystals upon ultraviolet and inner-shell excitations

The paper presents the results of the study on luminescence and electronic excitations in Li6Gd(BO3)3 single crystals. The optical and luminescence spectroscopy with a sub-nanosecond time resolution upon selective photoexcitation in the energy range from 3.0 to 650 eV was used to investigate in detail the luminescence of both the Gd3+ host ions and Ce3+ impurity ions as well as the processes of energy transfer between them. The intrinsic ultraviolet emission at 3.95-3.97 eV due to Pj6→S7/28 transitions in the Gd3+ host ion and the fast luminescence at 2.8-3.0 eV due to 5d→4f1 dipole-allowed transitions in the Ce3+ impurity ion were studied upon excitations through the intracenter, charge transfer, band-to-band, and inner-shell transitions. The specificity of the energy transfer upon excitation of photoluminescence in the energy range of absorption of the inner shells of different atoms of the crystal, as well as in the energy region of the giant resonance of 4d-4f transitions was revealed. On the basis of the experimental data, the bandgap Eg=9.3 eV, the minimum energy of the 5d→4 f1 and charge transfer transitions were determined. The expected positions of the ground states of the 4fn and 4fn-15d levels of trivalent lanthanide ions as well as the 4fn+1 and 4f n5d levels of divalent ions were calculated for all the lanthanide ions in Li6Gd(BO3)3 host crystal. © 2012 Elsevier B.V. All rights reserved

INTEGRATION OF CAE AND CAM SOFTWARE AS PART OF DISTRIBUTED PRODUCTION

In this work, the results of research and practical application are presented, which show the remote operation of CAM and CAE software packages via the Internet for modeling and programming machining processes as part of a distributed production

Spectroscopic study of red-light-emitting centers in K2Al 2B2O7: Fe single crystals

We report on spectroscopic study of red-light-emitting centers in K 2Al2B2O7 (KABO) single crystals containing ca. 2 ppm of Fe3+. Owing to the low Fe3+- concentration, KABO does not show noticeable absorption due to Fe3+ d-d-transitions in the visible spectral region, but it exhibits the charge-transfer (CT) UV-absorption bands O-Fe at 4.7, 5.7 and 6.5 eV. The red photoluminescence at 1.675 eV (FWHM = 0.173 eV) is due to intracenter 4T1 (4G) → 6A1 (6S) transitions in Fe3+ ions. Because of partial overlapping of the fundamental absorption edge of the crystal, where mobile excitons are created, and a broad CT absorption band at 6.5 eV, the most intensive red emission occurs at 7 K upon excitation in the excitonic energy region. The presence of two nonequivalent Al2O7 clusters in KABO lattice provides two different types of red-light-emitting centers in the form of Fe3+ ion occupied the Al3+ tetrahedral site. Superposition of their luminescence bands determines both the spectrum and temperature dependence of red emission in KABO at T = 7-80 K: two bands with the ratio of intensities of ca. 2:1 are 20 meV-shifted relative to each other; two-stage thermal quenching obeys the Mott law with ET = 9 and 20 meV. © 2013 Elsevier B.V. All rights reserved

Ultraviolet-visible spectroscopic characterization of lanthanum beryllate crystals doped with Er, Nd, or Pr ions

Spectroscopic characterization of lanthanum beryllate La2Be2O5 (BLO) single crystals doped with trivalent ions of Eu, Nd or Pr, was carried out in the ultraviolet-visible spectral range using synchrotron radiation spectroscopy in combination with conventional optical absorption and luminescence spectroscopy techniques. On the basis of the obtained data, the energy level diagram for these trivalent impurity ions in BLO host lattice was developed; the optical and electronic properties of the crystals were determined; the possibility of the 4f-4f, 4f-5d and charge transfer transitions was analyzed; spectroscopic properties of the lattice defects formed during the introduction of trivalent impurity ions in the BLO host lattice, were investigated. We found that the lattice defects are responsible for a wide-band photoluminescence (PL) in the energy region of 400–600 nm. The most efficient excitation of the defect photoluminescence in the energy gap of BLO occurs in broad PL excitation-bands at 270 and 240 nm. The PL intensity of defects depends on the type of impurity ion and increases in the sequence: Pr-Nd-Er. © 2016, Pleiades Publishing, Ltd

DISTRIBUTED ENVIRONMENT FOR DESIGN OF TECHNOLOGICAL EQUIPMENT BASED ON RUSSIAN SOFTWARE

In this work, a distributed design of technological equipment was organized for the implementation of educational projects by students. The integrated CAD\CAE\CAM\PLM environment was created on the basis of software from the ASCON company. The project files were uploaded to a virtual machine.Работа по программно-аппаратному и методическому обеспечению проектной деятельности студентов магистратуры выполнена в рамках проекта "Создание межвузовской распределенной среды проектирования на базе отечественного программного обеспечения для реализации качественного проектного обучения" - победителя грантового конкурса Стипендиальной программы Владимира Потанина 2022/2023