1Lomonosov Moscow State University, Russia
2Helmholtz-Zentrum Dresden-Rossendorf, Germany
3Baltic Federal University, Russia
We present the results of numerical simulation of magnetodielectric effect (MDE) in magnetorheological elastomers (MRE) –the change of capacity of plane capacitor filled with magnetic elastomer and placed under the external magnetic field. The computer model of effect is based on the assumption about the displacement of magnetic particles inside the elastic matrix under the external magnetic field and the formation of chain-like structures. Such displacement of metallic particles between the planes of capacitor leads to the change of capacity, which can be considered as a change of effective dielectric permittivity of elastomer caused by magnetic field (magnetodielectric effect).
The developed model resulted in perfect qualitative agreement with all experimental data obtained earlier for Fe-based elastomers. The proposed model is useful to study these novel functional materials, analyze the features of magnetodielectric effect and predict the optimal composition of magnetorheological elastomers for further profound experimental study.
In this work we simulated MDE for series of samples varying with concentration of magnetic filler, size and space distribution of particles, elastic properties of matrix. We have found that the effect tends to saturation and has hysteretic feature due to the elastic response of matrix. The influence of orientation of magnetic field and capacitor plane was studied as well, the change of sign of the effect for parallel and perpendicular orientation was observed as well.
Nikolai Perov works in Lomonosov MSU since 1977, PhD in magnetism - 1986, DrSc in magnetism - 2009, visiting experience - Tohoku university, Toyohashi university of technology, National University of Singapore, Duisburg-Essen university. Nowadays he is the head of the magnetism department of Lomonosov MSU. Research interests are in investigation of magnetic field.
Universitat Politecnica de Valencia, Spain
Photonic integrated circuits (PICs) promise to open new avenues in high-performance computing, biosensing or optical beamforming, amongst others. Current PICs rely on the use of guided interconnects, hampering the creation of flexible and reconfigurable networks-on-a-chip and preventing the far-field light-matter interaction for many sensing applications. Here we propose a novel on-chip silicon antenna that, in contrast to their plasmonic counterparts, exhibits an ultra-high directivity (>100), low losses, low reflections and a broadband response. These nanoantennas are the main building blocks of a new wireless photonic platform that solves the aforementioned problems, widening the range of achievable integrated photonic functionalities. The studied antennas consist of inverted-taper silicon strips with additional structures behaving as directors. They were modelled via Huygensʼ Principle and fabricated over silicon-on-insulator wafers, assuring CMOS compatibility. As main applications we experimentally demonstrate the first on-chip wireless data-streaming link, with a speed as high as 160 Gbit·s-1 over a distance of 100 µm, an electrically controlled antenna-array beam-steering device and an ultra-compact (with a footprint several orders of magnitude smaller than previous versions) lab-on-a-chip antenna-based microflow cytometer able to classify microparticles of several sizes. This work shows the potential of the proposed wireless platform, providing much more flexible and reconfigurable optical interconnects and architectures as well as boosting new applications in the field of nanoscale applications and photonic integrated circuitry.
Sergio Lechago received the Engineering Masterʼs Degree in Telecommunications (2014) from the Universitat Politecnica de Valencia (UPV), Spain, and is currently finishing his PhD on Silicon photonic nanoantennas. Sergio has thorough experience in the design and characterization of Si photonic devices, including wireless on-chip systems as well as nanolithographic fabrication techniques carried out at clean rooms. Sergio is collaborating in several FP7 and H2020 European projects, including FP7-ICT-PHOXTROT and the H2020-FET-HPC EXANEST. Sergio has authored or co-authored publications in relevant international conferences and high impact journals (Natureʼs Light Science and Applications, Optics Express, Optics letters or Journal of optics).
Kurukshetra University, India
The question whether deformed nuclei are triaxial has been raised from the early days of the study of nuclear collective motion. Davydov and Fillipov proposed their triaxial rigid rotor model in 1958, five years after Bohr and Mottelson proposed the nuclear collective model in 1953. But the idea of triaxiality in nuclei did not gain much acceptance. Nuclear collective motion continued to be investigated with the assumption of axial symmetry till recent times. Recent investigations indicate that some nuclei in the transitional region are better described by the assumption of triaxiality.
Also early in the history of nuclear collective motion, Wilets and Jean (1956) proposed the gamma soft vibrator model. In this model, the potential energy surface has a minimum for β ≠ 0 but is independent of the triaxiality parameter ϒ. Thus, the nucleus is unstable with respect to ϒ deformation and the value of ϒ fluctuates widely. Though based on diametrically opposite physical pictures, both the models have been used to describe collective spectra in the transitional region with some success.
Understanding the inter relationship between these two contradictory models has been the topic of many investigations. The connection became clear with the introduction of the Interacting Boson Model (IBM) by Arima and Iachello in 1974. In particular, the 0 (6) limit of IBM is related to triaxiality. It has been shown that in the limit of infinite boson number the 0 (6) limit of IBM is equivalent to the gamma soft model of Wilets and Jean.
In our work we have studied some of the aspects of the interrelationship between various models of triaxiality. We find that near ϒ = π/6 to the first approximation, the energy levels of a rigid triaxial rotor are gamma flat, thus mimicking a gamma soft behavior. Cubic terms were introduced in the IBM Hamiltonian by Casten to produce rigid triaxiality. Whether such terms can be generated from the Casimir invariants of the subgroups of U (6) was investigated. All possible cubic terms were constructed from the Casimir invariants of the subgroups of U (6). Their classical limits were taken and it was found that, except for one none could produce rigid triaxiality.
Dr. Ramesh Kumar Gupta is the Principal of 70 Years old reputed pre-independence and Historic college known as Vaish College, Rohtak since 20.07.2011. He has done M.Sc (physics), M.Phil (Physics), Ph.d (Specialization Nuclear Physics). He has served as Associate Professor in physics at Vaish College for 23 Years. He was also the Registrar of Maharaja Aggarsain University Buddi (H.P) for nearly one ‘year. He was also Deputy Academic Registrar/ Associate Professor in physics at Delhi Institute of advanced studies at Sector 25, Rohini New Delhi for nearly 2 Years. He has presented various research papers in national/international Conferences.ʼ He is the member of various committee of M.D.U Rohtak. He has written various books on physics & personality development.
National Science Foundation, USA
The current research and fast innovation and development in the field of Automation, Robotics, Internet of Things (IoT) and Artificial Intelligence (AI), in conjunction with the ubiquitous access to Internet, Smart Computational Devices (SCD), and Ultrafast Global Communication is opening a new era of Experimental Computational Physics. The third millennium is a new era the Smart Fully Automated Cyberspace that is becoming pervasive in its nature while connecting the next generation of Ultra-smart Robotic Devices with the computationally powerful SCDs accessible to anyone, anywhere and at any time. In support of Smart Robotics, the telecommunications networks providers and SCDs developers, are working together to create much faster transmission channels with provision of higher quality of service for any multimedia content for anyone, anywhere at any time. The Human Machine Interface with high definition audio and video facilitates seamless control of Smart Robotics & Computational Devices (SRCD), which are becoming a common technology in family homes, business, academic, and business, and industry worldwide. The author discusses the current and future trends of research, innovation and developments in Automation, SRCD, Cyber Physical Critical Infrastructures (CPCI) and Cyber Assurance, in conjunction with the Future Ultra-Fast Internet and Ultra-SRCD. The author promotes creation of multidisciplinary multinational research teams of Experimental Computational Physicists and Technologist, to develop Next Generation SRCD and Fully Automated Environment, while utilizing Ultra-Smart Robotic & Computational Devices, in conjunction with the critical Cyber Safety and Assurance challenges for today and for tomorrow.
Prof. Babulakis accomplished global scholar, consultant, educator, engineer and polyglot. He successfully published and presented his work worldwide. He was Invited Speaker at the University of Cambridge, MIT, Purdue University, Yokohama National University and University of Electro Communications in Tokyo, Japan, Shanghai Jiao Tong University, Sungkyunkwan University in Korea, Penn State in USA, Czech Technical University in Prague, University at West Indies, Graz University of Technology, Austria, and other prestigious institutions worldwide. His biography was cited in Cambridge Blue Book, Cambridge Index of Biographies, Stanford Whoʼs Who and number of issues of Whoʼs Who in the World and America.