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News Article | May 24, 2017

TOKYO--(BUSINESS WIRE)--Mitsubishi Electric Corporation (TOKYO:6503) announced new technologies, outlined below, at its annual Research and Development Open House held today at Tokyo International Forum in Tokyo, Japan. No. 3109 Mitsubishi Electric Consolidates AI Technology under “Maisart” Brand Making devices smarter and life more secure, intuitive and convenient The company announced today its new “Maisart” brand encompassing the company’s proprietary artificial intelligence (AI) technology, including its compact AI, automated design deep-learning algorithm and extra-efficient smart-learning AI. No. 3110 Mitsubishi Electric Develops Solution to Visualize Radio Waves to Support IoT System Enables optimal placement of wireless equipment to be designed fast and inexpensively The company has developed a radio wave visualization solution for ascertaining, with high speed and high precision, the intensity of radio waves when designing the optimal placement of wireless communication equipment. No. 3111 Mitsubishi Electric Develops Smart-learning Algorithm for Extra-efficient AI Dramatically reduces number of trials required for precise machine-learned AI control The company announced today that it has developed a proprietary deep-reinforcement algorithm for artificial-intelligence (AI) machine control that requires just one-fiftieth the number of trials compared to conventional AI control methods. No. 3112 Mitsubishi Electric Separates Simultaneous Speech of Multiple Unknown Speakers Recorded with One Microphone Speech-separation technology achieved with proprietary “Deep Clustering” AI method The company announced today that it has created the world’s first technology that separates, and then reconstructs with high quality, the simultaneous speech of multiple unknown speakers recorded with a single microphone in real time. No. 3113 Mitsubishi Electric Uses Illumination for Building Guidance Systems Illuminated projections are expected to streamline in-building traffic The company announced today an innovative in-building guidance system that uses illuminated projections to provide building visitors with directions and detailed elevator-status information. No. 3114 Mitsubishi Electric Develops Unique Technology for Electromagnetic-field and Large-coupled Analysis of Turbine Generators The company announced today the development of what it believes is the world’s-first technology for determining the operational status of power generators using electromagnetic-field analysis of up to an unprecedented 30 million meshes and coupled-numerical analysis.

He S.,Nanjing Southeast University | He S.,Radio Waves | Huang Y.,Radio Waves | Yang L.,Nanjing University of Posts and Telecommunications | And 3 more authors.
IEEE Transactions on Signal Processing | Year: 2014

Energy efficiency optimization of wireless systems has become urgently important due to its impact on the global carbon footprint. In this paper we investigate energy efficient multicell multiuser precoding design and consider a new criterion of weighted sum energy efficiency, which is defined as the weighted sum of the energy efficiencies of multiple cells. This objective is more general than the existing methods and can satisfy heterogeneous requirements from different kinds of cells, but it is hard to tackle due to its sum-of-ratio form. In order to address this non-convex problem, the user rate is first formulated as a polynomial optimization problem with the test conditional probabilities to be optimized. Based on that, the sum-of-ratio form of the energy efficient precoding problem is transformed into a parameterized polynomial form optimization problem, by which a solution in closed form is achieved through a two-layer optimization. We also show that the proposed iterative algorithm is guaranteed to converge. Numerical results are finally provided to confirm the effectiveness of our energy efficient beamforming algorithm. It is observed that in the low signal-to-noise ratio (SNR) region, the optimal energy efficiency and the optimal sum rate are simultaneously achieved by our algorithm; while in the middle-high SNR region, a certain performance loss in terms of the sum rate is suffered to guarantee the weighed sum energy efficiency. © 1991-2012 IEEE.

News Article | September 16, 2016

Happy iPhone launch day, Apple fans! You've waiting long enough and now your precious new iPhone is finally here. We told you how to survive iPhone 7 release day and maybe even find that iPhone 7 Plus you want without needing a preorder. We showed you photos, videos and even poetry from iPhone launch day. Now, it's time to show you a handful of paid iPhone and iPad apps on sale for free that'll help you fill up all that new storage space. MUST SEE: 10 best iPhone 7 and iPhone 7 Plus cases we’ve found so far These are paid iPhone and iPad apps that have been made available for free for a limited time by their developers. There is no way to tell how long they will be free. These sales could end an hour from now or a week from now — obviously, the only thing we can guarantee is that they were free at the time this post was written. If you click on a link and see a price listed next to an app instead of the word “get,” it is no longer free. The sale has ended. 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Golubkov G.V.,RAS Semenov Institute of Chemical Physics | Manzhelii M.I.,RAS Semenov Institute of Chemical Physics | Karpov I.V.,Radio Waves
Russian Journal of Physical Chemistry B | Year: 2013

In periods of high solar activity and the formation of geomagnetic storms, additional background incoherent ultrahigh frequency (UHF) radiation with decimeter to millimeter wavelengths in the high E and D layers of the Earth's ionosphere is generated. This emission is produced by transitions between Rydberg states of atoms and molecules of atmospheric gases, which are excited by electrons and are surrounded by a neutral species of the medium. At present, there is no reliable information on the integrated intensity of UHF radiation in this wavelength range. This problem can be solved on knowledge of the dynamics of collisional and radiative quenching of Rydberg states and of the kinetics of their population in the lower ionosphere. An analysis of the available experimental data shows that the radiation is generated in an atmospheric layer located at altitudes between 50 and 110 km. The current theory is discussed and the ways of its further improvement connected with the development of more rigorous theoretical methods for describing the effect of neutral particles of medium on the collisional and radiative quenching dynamics, including the elementary processes with participation of the nitrogen and oxygen molecules, are suggested. For quantitatively estimates the influence of excited particles on the incoherent UHF radiation of the atmosphere, it is necessary carrying out of the preliminary calculations the potential energy surfaces and dynamics of nonadiabatic transitions between Rydberg states, construction the electronic wave functions, and determination the dipole moments of the allowed transitions and the emission line shapes. Obtained results can be included into the general kinetic scheme which defines of the UHF radiation intensity versus the density and temperature of the atmosphere. Accompanying its infrared (IR) radiation can be used to define of Rydberg states. © 2013 Pleiades Publishing, Ltd.

Borisov N.,Radio Waves | Franz M.,Max Planck Institute for Solar System Research
Nonlinear Processes in Geophysics | Year: 2011

We show that the slow magnetosonic (SM) perturbations generated in the vicinity of the magnetopause, due to the excitation of the Kelvin-Helmholtz (K.-H.) instability in the case of a supersonic flow velocity, are transformed into fast magnetosonic (FM) waves which can propagate into the magnetosheath. Under the conditions discussed in this paper, the FM wave has negative energy in the stationary (magnetospheric) coordinate frame. Due to this the outgoing FM wave increases the growth rate of the K.-H. instability excited at the magnetopause. Within the linear theory, we investigate the influence of the excited FM wave on the growth rate of the K.-H. instability. Simultaneously we predict the transformation of the SM mode into kinetic Alfvén (KA) mode. Thus, in general, two types of waves with different polarizations (the KA wave and the FM wave) should appear in the magnetosheath due to the excitation of the K.-H. instability. At the same time, the SM perturbations are only present in the localized region where the K.-H. instability is excited. To correctly describe the excitation of waves, we use two-fluid (for electrons and ions) magnetohydrodynamics. This approach is more general than the ideal magnetohydrodynamics and allows us to take into account the effects associated with the finite Larmor radius of ions. Also it can be used to investigate the K.-H. instability in a multi-component plasma, or in the case where the frequency of perturbations is of the order of the gyrofrequency of oxygen ions which may occur, for example, at the magnetosheath of Mars.

Borisov N.,Radio Waves | Mall U.,Max Planck Institute for Solar System Research
Planetary and Space Science | Year: 2010

A model is introduced to discuss the enhanced backscattering of light from the surfaces of bright, airless cosmic bodies. The surface layer that reflects the radiation is assumed to consist of large-scale, semitransparent, stochastically distributed grains. We argue that in the case of semitransparent grains it does not make any sense to divide the backscattered signal into two different parts produced by two different mechanismsshadow hiding and coherent backscattering. It is shown that the phase and the amplitude fluctuations acquired by the wave penetrating into such a layer play a crucial role in the process of backscattering providing a broad pedestal and a narrow peak. Our results, in accordance with the experimental data, demonstrate a rather weak angular dependance of the backscattering peak on the size of the grains and the wavelength. The model deals only with media in which the refractive index is close to unity and the samples are optically thin. Therefore, our model does not correspond to physical properties of real regolith and its laboratory simulants. However, even in its present form the model describes qualitatively correctly some of the unexplained experimental results. © 2010 Elsevier Ltd. All rights reserved. All rights reserved.

Cannon P.D.,Lancaster University | Honary F.,Lancaster University | Borisov N.,Radio Waves
Journal of Geophysical Research A: Space Physics | Year: 2016

Experiments in the illumination of the F region of the ionosphere via radio frequency waves polarized in the ordinary mode (O-mode) have revealed that the magnitude of artificial heating-induced effects depends strongly on the inclination angle of the pump beam, with a greater modification to the plasma observed when the heating beam is directed close to or along the magnetic zenith direction. Numerical simulations performed using a recently developed finite-difference time-domain (FDTD) code are used to investigate the contribution of the O-mode to Z-mode conversion process to this effect. The aspect angle dependence and angular size of the radio window for which conversion of an O-mode pump wave to the Z-mode occurs is simulated for a variety of plasma density profiles including 2-D linear gradients representative of large-scale plasma depletions, density-depleted plasma ducts, and periodic field-aligned irregularities. The angular shape of the conversion window is found to be strongly influenced by the background plasma profile. If the Z-mode wave is reflected, it can propagate back toward the O-mode reflection region leading to resonant enhancement of the electric field in this region. Simulation results presented in this paper demonstrate that this process can make a significant contribution to the magnitude of electron density depletion and temperature enhancement around the resonance height and contributes to a strong dependence of the magnitude of plasma perturbation with the direction of the pump wave. © 2016. American Geophysical Union. All Rights Reserved.

Puchkov V.A.,Radio Waves
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2013

Powerful electromagnetic waves illuminating the ionospheric plasma generate small-scale density irregularities elongated in the direction of the geomagnetic field. Stochastic motion of these irregularities results in fluctuations of HF radio signals backscattered by the illuminated region. Observations of the full wave form of the radio signals make it possible to reconstruct the distribution function of the irregularities over their velocities. An experiment with such a reconstruction is proposed. © 2013 Elsevier B.V. All rights reserved.

News Article | October 16, 2011

Invisible Fields is a major new international exhibition at Arts Santa Mònica in Barcelona Spain, co-produced by Lighthouse in Brighton. It brings together over a dozen internationally known artists, designers and scientists to explore the radio spectrum – the invisible environment that underpins contemporary technology. Co-curated by José Luis de Vicente and Honor Harger, the show includes significant works by Rafael Lozano-Hemmer, Trevor Paglen, Timo Arnall, Joyce Hinterding and many more.  The show is presented in the Laboratory space of Arts Santa Mònica directed by Josep Perelló. Invisible Fields explores how our understanding of our world and our cosmos has been transformed by the study of radio waves. With the invention of telecommunication technology at the end of the 19th century, the radio spectrum became a tool for rethinking the world we live in. Radio collapsed geographical distance, crossed borders and cultures, became a powerful catalyst for commerce and enabled scientists to study the cosmos in entirely new ways. Yet whilst the radio spectrum is the invisible infrastructure that enables the technologies of information and communication, most people are unaware of the way it works, how it is managed, and how it is has shaped our understanding of our lived environment. Invisible Fields aims to shine a light on this enigmatic landscape. The exhibition differs from past explorations of these topics, in that it is conceived as an interdisciplinary blend of social-cultural analysis, science communication, and artistic practice. A catalogue in Spanish, Catalan and English editions is being published and will be available in November. It features essays by Douglas Kahn, Adam Greenfield, Martin Howse, Josep Perelló and others. Lighthouse will be working with partners to bring the show to the UK in 2012. – 20Hz (new commission) by Semiconductor – Drone Vision by Trevor Paglen – Frequency & Volume by Rafael Lozano-Hemmer – Harnessing Wild Electricities from Outer Space by Thomas Ashcraft – Immaterials by Timo Arnall – Invisible Forces by Anthony DeVincenzi – Loops and Fields: Induction Drawings Series 4 by Joyce Hinterding – Magnetic Movie by Semiconductor – New commission by Job Ramos – Observatorio by Clara Boj and Diego Diaz – Office of Spectral Ecology by Matthew Biederman – Skrunda Signal by Rasa Smite & Raitis Smits (RIXC) – The Conet Project by Irdial Records Plus the show includes a community Wifi workshop and information space by; a satellite observation ground-station and workshop series by Plataforma Cero LABoral; an antenna collection and antenna-building workshop by Luthiers Drapaires; and a radio building workshop by Arts Santa Monica. The exhibition design, by Run Design, includes an operational Faraday Cage, a visual spatialisation of the electromagnetic chart and a visual timeline of spectrum utopias. MORE ABOUT THE SHOW More than a linear, historical narration of the evolution of spectrum technologies, Invisible Fields: Geographies of Radio Waves can best be understood as an “observatory”, which enables visitors to perceive the radio spectrum. It sets out the spectrum as a physical space, invisible but present, a terrain that can be studied, mapped, surveyed and explored. It is an environment made of signals and waves from nature, and from us. Its topography is formed of waves of different scales, from tiny emissions given off by domestic objects to vast emissions made by distant astronomical phenomena. It’s made up of signals that are very familiar, such as television and radio, and signals which are esoteric and enigmatic. It is an ecology that has public spaces – wireless internet and amateur radio – and secret spaces – coded military transmissions and clandestine signals. Following on from pioneers such as John Cage, Alvin Lucier and Pauline Oliveros, contemporary artists such as Thomas Ashcraft, Semiconductor and Joyce Hinterding create powerful works that allow us to understand the radio spectrum as an extension of the natural world. Sitting alongside their almost Emersonian understanding of radio as nature, is recent work in the field of architecture, design and urbanism, which expands the notion of urban space into the invisible realm of the spectrum. “Hertzian space”, a term coined by designers, Anthony Dunne & Fiona Raby, is defined by our transmissions of radio, television, wireless internet, GPS data and mobile phone signals. It is a space interrogated by artists and designers such as Timo Arnall from the BERG group in London, and Clara Boj and Diego Diaz who create clever visualisations of the presence of waves in our daily life. Elsewhere in the show, artist Rafael Lozano-Hemmer’s monumental tribute to the radio dial, enables us to physically move through radio transmissions, giving us a visceral encounter with our ethereal cultural surroundings. And experimental geographer and artist, Trevor Paglen and artist-activists, RIXC, shed light on the dark zones of the spectral landscape. Invisible Fields is not only concerned with the topology of the radio landscape, but rather the socio-political activities that take place within it. Alongside the artworks in the show are operational workshops, which remind us that our position with the architecture of the spectrum is far from being that of a passive observer. As such, the exhibition space hosts intensive activity for a wide variety of audiences, with workshops on Sunday mornings, and a complete education programme offered to schools. Taken together the works in Invisible Fields make the intangible materiality of the electromagnetic spectrum visible and audible. They open up the Hertzian space around us, and above us, to our senses. The visions of artists, the solutions of designers, and the experiments of scientists give us the tools we need to create our own mental maps of this profoundly influential terrain. Produced by Arts Santa Mònica, in association with Lighthouse. Curated by: José Luis de Vicente and Honor Harger Assisted by: Irma Vilà In conjunction with British Council, Bureau du Quebec, Barcelone | Conseil des Arts et des Lettres du Quebec, Laboral Centro de Arte y Creación, Gijon, Bòlit, Centre d’Art Contemporani, Girona. We acknowledge the support of: Proyecto PARTNeR Centro de Astrobiología (INTA-CSIC), Departament d’Astronomia I Meteorologia-Universitat de Barcelona, Escola Tècnica Superior d’Enginyeria de Telecomunicació de Barcelona-Universitat Politècnica de Catalunya.

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