Sergey Mikhailovich Afonin is an Associate Professor in the Department of Intellectual Technical Systems at National Research University of Electronic Technology (Moscow Institute of Electronic Technology MIET). He/She has completed his/her Graduation in Electronic Technology at the National Research University of MIET in 1976 and a PhD in Electronic Technology Engineering and Control Systems at MIET in 1982. He/She has an Academic title of Senior Researcher received at MIET in 1991. He/She is an Aspirant at MIET from 1976 to 79, Junior Researcher at MIET from 1979 to 82, Senior Researcher at MIET from 1983 to 93, Associate Professor at MIET since 1993. His/Her contributions include more than 200 scientific papers to professional publication and 16 inventions. He/She is the Recipient of a Silver medal VDNKH Russia and two Bronze medals VDNKH Russia.
The application of the electromagnetoelastic actuator based on the electromagnetoelasticity for the piezoelectric, piezomagnetic, electrostriction, magnetostriction effects is promising in the nanotechnology, the nano-biology, the power engineering, the microelectronics and the adaptive optics equipment. The correcting devices are chosen for providing the high quality of the control systems for the deformation of the piezo actuator. The analytical expressions for the sufficient absolute stability conditions of the system with the hysteresis nonlinearity of the electromagnetoelastic actuators are written using the Yakubovich absolute stability criterion with the condition on the derivative, which is the development of the Popov absolute stability criterion. For the Lyapunov-stable control system, the Yakubovich absolute stability criterion for the systems with the single hysteresis nonlinearity provides the simplest and pictorial representation of results of the investigation of the stability and the possibility of the synthesis of the correcting devices of the system ensuring the stability of the strain control systems with the electromagnetoelastic actuators. The characteristics of the electromagnetoelastic actuators are the alternating-sign hysteresis type for the piezo actuators and the constant-sign butterfly type for the electrostriction actuators. In the magnetostriction and electrostriction actuators their initial operating point is chosen on one wing of the butterfly, for example, in the first quadrant, for the deformation range to be symmetric at both sides of the initial point. For the butterfly characteristic the initial working point displaced by the half deformation range. The values of the tangents of the inclination angles of the tangent line to the hysteresis nonlinearity on the butterfly wing for the electromagnetoelastic actuator are determined similar to the hysteresis characteristic. The stationary set of the control systems is the segment of the straight line. The absolute stability conditions with the condition on the derivative of the control systems with piezo actuator deformation in the case of the longitudinal, transverse and shift piezo effect for the hysteresis characteristic of the deformation of the piezo actuator are obtained. The obtained absolute stability conditions for the control system with the electromagnetoelastic actuator allow one to estimate and calculate the characteristics of the control system for the deformation of the electromagnetoelastic actuator.
Veroniki P Vidali is an Organic Chemist. She has completed her PhD at Agricultural University of Athens in 2004. She worked as a Post-Doctoral Fellow at Natural Products and Bioorganic Chemistry Laboratory/Institute of Nanoscience and Nanotechnology at NCSR “Demokritos\" from 2004 to 2007 and as Scientific Staff from 2007 to 2017, while since 2017 she has been working as a Research Assistant at NCSR “Demokritos\". Her main research interests include organic synthesis of bioactive natural products and polyaromatic compounds applied in nanotechnology. She has co-authored 18 peer-reviewed research articles in international journals and one book-chapter
Well-defined, low molecular weight amorphous organic materials based on polyaromatic compounds exhibit interesting optical, electronic, and magnetic properties; whereas they can also serve as the basis for developing lithographic materials. Thus, they have been receiving attention for the development of organic devices in the nanoscale with substantially enhanced performance and new functions. Solution processability of such materials is highly desirable, since techniques, such as spin-coating, lower significantly the cost for the fabrication of the devices. Herein, a design strategy and synthesis of solution-processable small molecules, with well-defined monomolecular structures based on anthracene, is presented. Anthracene moieties are combined with other poly-functionalized planar and tetrahedral cores, providing control of physicochemical properties, such as solubility, thermal stability, and Tg. Selected members of this class, provided amorphous homogeneous films which were stable at temperatures up to 150°C. These molecules have been, also, evaluated as main components in the active layer of OLEDs, providing very promising results. Self-patterning was also allowed by incorporation of suitable acid-sensitive functional groups and a photoacid generator. These results demonstrate the potential of these materials to be used in the fabrication of patterned structures for OLEDs. A flexible, efficient and cheap methodology, suitable for the preparation of these anthracene-based molecules in large scale is also described, using representative examples