Possibilities offered by implantable miniaturized cuff-electrodes for insect neurophysiology

AbstractRecent advances in microsystems technology led to a miniaturization of cuff-electrodes, which suggests these electrodes not just for long-term neuronal recordings in mammalians, but also in medium-sized insects. In this study we investigated the possibilities offered by cuff-electrodes for neuroethology using insects as a model organism. The implantation in the neck of a tropical bushcricket resulted in high quality extracellular nerve recordings of different units responding to various acoustic, vibratory, optical and mechanical stimuli. In addition, multi-unit nerve activity related to leg movements was recorded in insects walking on a trackball. A drawback of bi-polar nerve recordings obtained during tethered flight was overlay of nerve activity with large amplitude muscle potentials. Interestingly, cuff-electrode recordings were robust to withstand walking and flight activity so that good quality nerve recordings were possible even three days after electrode implantation. Recording multi-unit nerve activity in intact insects required an elaborate spike sorting algorithm in order to discriminate neuronal units responding to external stimuli from background activity. In future, a combination of miniaturized cuff-electrodes and light-weight amplifiers equipped with a wireless transmitter will allow the investigation of neuronal processes underlying natural behavior in freely moving insects. By this means cuff-electrodes may contribute to the development of realistic neuronal models simulating neuronal processes underlying natural insect behavior, such like mate choice and predator avoidance

Исследование влияния жесткости конструкции на точность и качество деталей, полученных на установке гидроабразивной резки

Цель магистерской диссертации является исследование влияния жесткости конструкции на точность и качество деталей, полученных на установке гидроабразивной резки. В процессе исследования проводился ряд экспериментальных исследований по определению точности обработки в разных зонах резания при разных режимах, определена статистическая жёсткость системы гидроабразивной обработки. В результате исследования установлен характер погрешностей обработанных поверхностей деталей, получаемых при использовании технологии гидроабразивной резки, выявлены причины появления погрешностей обработки поверхностей деталей, оптимизированы параметры, влияющие на качество и точность обработки, получена математическая модель установки гидроабразивной обработки.The purpose of the master's thesis is to study the influence of structural rigidity on the accuracy and quality of parts obtained at the waterjet cutting plant. During the research, a number of experimental studies were conducted to determine the accuracy of processing in different cutting zones under different modes, and the statistical rigidity of the waterjet processing system was determined. The study of the nature of errors of machined part surfaces obtained by using water jet cutting technology, identified the causes of errors of processing of surfaces of details, the optimized parameters affecting the quality and accuracy of processing, a mathematical model of a hydroabrasive treatment

Исследование влияния частоты и длительности импульсов на свойства покрытий, осаждаемых на титановые сплавы методом микродугового оксидирования

Объектом исследования являлись кальций-фосфатные покрытия, сформированные методом микродугового оксидирования, при различных специально подобранных режимах работы. Целью данной работы являлось исследование влияния частоты следования и длительности импульсов на физико-химические и механические свойства покрытий, сформированных методом микродугового оксидирования. В результате исследования были выявлены утверждения, которые могут быть полезны при подборе режимов для формирования специальных покрытий для разного рода применений.The object of the study is calcium-phosphate cotaing formed by microarc oxidation method on different parameters. The aim of the work is to study the effect of the repetition frequency and pulse duration on the physical, chemical and mechanical properties of coatings formed by microarc oxidation. As a result of the research, statements were identified that can be useful in selecting modes for forming special coatings for various types of applications

Proceedings of the 4th bwHPC Symposium

The bwHPC Symposium 2017 took place on October 4th, 2017, Alte Aula, Tübingen. It focused on the presentation of scientific computing projects as well as on the progress and the success stories of the bwHPC realization concept. The event offered a unique opportunity to engage in an active dialogue between scientific users, operators of bwHPC sites, and the bwHPC support team