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. If you download the app, you will be charged. See video and little practice and you may get 1% accuracy. How to use Ruler to measure length: Put your finger on screen and slide phone with the other hand. Pull arrow down to reel off. * Extract multiple still images from Live Photos * Extract multiple still images from Videos * Extract multiple still images from Animated GIF * Extract multiple still images from Burst Photo * Easily get the exact moments * Extract unlimted number of photos * Save and share the extracted photos easily * You can even convert the extracted photos into photo collage and slideshow [Live 2 Photos] is the World's first all in one tool which enables you to extract multiple still images from your Live Photo, Video, GIF and Burst Photo. Super fast search bar so that you never miss any chance to catch your favourite Pokemon! Presenting to you the most advanced Pokedex ever made, With over 700+ Pokemon and counting! The full guide you need to get ready for Pokemon Go! Introducing Pokeforums! Your one stop place to chat and interact with thousands of other Pokemon Go players! Like and Unlike Each Other's post! Call Friends to come visit you and catch pokemon together! On a slow connection? Speed up Safari with Speedafari! Speedafari blocks unnecessary parts of websites from loading. By removing part of the experience (ads, tracking scripts, external fonts, videos, etc.), you save time, battery, and data. Speedafari is always just a swipe away, in the notification center. Just tap once, and — boom — Safari speeds up. No need to switch browser. Easily switch between three different aggressiveness levels — low, medium, and high. The higher the aggressiveness, the more will be blocked, and the faster the page will load. Note that some website functions may not work at all with the medium and high levels. Whitelist the sites you love effortlessly — without leaving Safari — to support them by letting them show you ads (which, naturally, makes them load slower). Use the Speedafari URL scheme to turn on and off speedup, and change the aggressiveness, from inside other apps. For example, you can make Speedafari semi-automatically trigger upon leaving home, by using the Launch Center Pro app. You're out in the woods? With Speedafari, don't worry about slow internet anymore! "Speedafari is a blocker that strips away everything it can so you can still load pages even when your connection is crap." - Thorin Klosowski, Lifehacker.com Oh, and don't worry about privacy! Speedafari has no access at all as to what web pages you visit. Note that all features are included in the download price, and that in-app purchases are not required to unlock anything. The in-app purchases simply provide a means to voluntarily support the development of Speedafari. – "You didn't know that you needed this nifty little app until you used it; then, you wondered how you could have gone this long without it! Flawless so far." – "On its highest level of blocking it eliminates *all* graphics, which is terrific if you have limited bandwidth or just want to get to a site's text. [...] Very useful, unique features make this a must-have for me. Recommended." – "The ability to quickly turn it on and off and change the aggressiveness through the notification menu is a win win." – "It works beautifully." – "One of the best app purchases made" – "Get it. Quickly." Snapshot Cam is a fun and easy to use camera & photo editor app. Create beautiful photos in seconds and share them with your friends. Add amazing stickers, apply stunning filters, draw & paint, add your own text or choose quotes from the extended library and personalize them with gorgeous fonts. Document your life or your travels with labeled photos. Make your friends laugh with funny edited pictures. Create your own birthday cards or invitations. The sky is the limit. * Enhance photos with lots of different filters * Decorate photos with hundreds of different stickers, arrows, hearts, flowers, banners etc. * Make a message out of your picture, choose from thousands of quotes and citations or write your own text * Personalize your writing with colors and hundreds of fonts * Use a painting brush to directly draw onto your picture * Instantly share your photos on Facebook, Twitter and other social networks Snapshot Cam is an easy, quick and fun way to capture and embellish your photos and share them with friends. Use filters, quotes and stickers to transform your pictures into works of art or to send funny messages to your friends and family. Create professional, great looking PDFs simply and easily right on your iPhone without having to go near a computer! Save2PDF will convert most file formats into a PDF including Word, Excel, Powerpoint, Pages, Numbers, Keynote, Photos, Web Pages, Contacts and many more formats. What the Press Say: Macworld: "Save2PDF is a superb app that provides a fairly unique function" iAppSin: "Save2PDF is a practical app dedicated to converting and merging PDF files" iPad.net: "It is definitely a must-have app for professionals who use their iPad for business purposes" TouchMyApps: "There’s currently nothing like it at the App Store and iDevice users who’ve always wanted to create their own PDF files should definitely check it out." Save2PDF also enables easy merging of several documents into a single PDF, even if the files are completely different formats (i.e. create a single PDF by combining a document with a spreadsheet, or a Pages document with a Word file). It is also just as easy to merge multiple PDFs into a single PDF file. One of the other powerful features of Save2PDF is the ability to select a few pages from a file (i.e. a document or PDF) and a few from one or multiple other files - creating a new PDF containing only the pages required from those files. The PDF creation, arrangement and preview screen is intuitive and easy to use. Rearranging document order, selecting page ranges and adding further documents is all contained within one single area; there is no complicated file structure or hierarchy to learn! Save2PDF can easily be used in conjunction with other apps like Pages, Numbers or Keynote, simply use Open in.....Save2PDF to transfer any file from another app and convert it into a PDF - all done in only 2 steps! Providing the other app supports Open in... file sharing, transferring documents into Save2PDF is easy. FULL PDF CONVERTER • Convert common file formats into a PDF right on your iPhone or iPod Touch without using a computer • View/Convert/Merge Microsoft Office files, iWork files, Photos, PDFs, Contacts, Web Pages, Email attachments as well as many more file formats • Create a single PDF from multiple files even if they are a different format (i.e. merge a Word file with a Pages document etc) • Email and print finished PDF directly from within Save2PDF MERGE or APPEND PDF FILES • Merge multiple PDF files together • Add a page to an existing PDF file (i.e. a cover letter or fax cover) • Quickly and easily add further appendices to an existing PDF document CREATE PDFs FROM OTHER APPS • Import files from other apps using the Open in... file sharing to transfer into Save2PDF and convert into a PDF • Works with any app that has the Open in file Sharing built in (i.e. Mail attachments, like Pages, Numbers or Keynote & many more) • Transfer documents and files from a computer into Save2PDF either via iTunes or by mounting the iPhone as a disk or using the free file transfer software, WePrint FULL CLOUD SERVICES SUPPORT • Fully integrated with iCloud, CloudMe, Dropbox, GoogleDocs, Box.net, WebDAV • Convert documents & files in the cloud to PDF without downloading them first • Move or Print documents on your iPhone/iPod Touch from your Cloud account FULLY FUNCTIONAL PRINTING • Print to ALL printers (Network/WiFi/USB/Bluetooth) via your Mac or PC or direct to most WiFi printers without additional software. Also print to Apple AirPrint printers • Print from Pages, Numbers or Keynote extremely quickly & easily without the need for an AirPrint printer using Open in • Print from other apps using Open in • USB & Bluetooth printers can be used with free print server software (Windows & Mac) • Print remotely via 3G/4G/EDGE WEB PAGE PRINTING • Convert web pages to PDF documents for sharing • Browse and print web pages to ALL printers • Store passwords and clear history/cache • Multiple tabs for splitting up browsing QUICK HELP - if you need it Just point your device to the sky to identify stars, planets, constellations and satellites. From the creators of the original Night Sky™ app comes an all-new powerful encounter with the sky above! “I’m very impressed with The Night Sky … it offers a delightful and polished user experience.” - Avery Wang (creator of Shazam) “…Pure fun to use and really hard to put down. … Exactly what educational apps should be all about” - iDownload Blog With a breathtaking new Sky View, Deep Space Objects, Sky Time Machine, Light Spectrum Array, a 3D Solar System, World Traveller mode and many more features, all designed for iOS 9. Prepare to be blown away with our most powerful and feature packed version yet - Night Sky Pro™. • Enhanced for Apple watchOS 2: Fully native app, live push notifications for ideal stargazing times, check out the Stargazing Clock, see Night Sky Pro™ Latest News right from your wrist, and what's around you with Night Sky™ Community features! • Breathtaking New Sky View: A completely redesigned new Sky View comes to Night Sky Pro™ with a vivid new colorful atmosphere, animations and more detailed stars, satellites, planets, and deep space objects than ever before, prepare to become visually immersed in the Night Sky Pro™. • Sky Time Machine: Travel into the future or into the past to view the sky how it was years ago, or how it will be in years to come, with the magical new Sky Time Machine. Sky Time Machine is exclusive to Night Sky Pro™. • Light Spectrum Array: View the sky through a vast array of light spectrums. Beautifully presented in the all-new Sky View. Radio Waves, Microwaves, Infrared, Gamma Rays, X-Rays, Visible Light, and Ultra-violet all magically revealed in the sky through the palm of your hand. Light Spectrum Array is exclusive to Night Sky Pro™. • Complete 3D Solar System View: Explore the entire Solar System with our all-new glorious 3D generated solar system. We’ve even included the Moon and the Dwarf Planet Pluto. 3D Earth also includes a visual representation of all the satellites around our planet! The Complete 3D Solar System View is exclusive to Night Sky Pro™. • Night Sky™ Community: Engage with fellow stargazers and astronomers in the exclusive Night Sky™ Community. Share ideal stargazing locations with others and explore locations others have shared. A 6 month subscription to Night Sky™ Community is included for FREE only with Night Sky Pro™. • Deep Space Objects: Night Sky Pro™ includes a comprehensive database of Deep Space Objects with rich in-depth information. Journey further into space and learn more about things further away than ever before as all deep space objects have also been added to the beautiful new Sky View. Deep Space Objects are exclusive to Night Sky Pro™. • World Traveller: Explore the sky from anywhere in the world with the new World Traveller mode. Fancy a trip to see what the sky looks like in another country? Then travel there instantly and view it from the palm of your hand. Combine World Traveller and Time Machine and you could even look at the somewhere else in the world in the past or future. Perfect when preparing for that upcoming stargazing trip! • Stargazing Conditions: Explore the Stargazing Conditions in your area for the upcoming week. Beautiful new stargazing graphs mean at a glance you can see the perfect time to go stargazing! • Stargazing Widgets & Notifications: See the Stargazing Conditions at a glance in iOS 9, with the Night Sky Pro™ widget. Never miss out on amazing things that are happening in the sky above ever again! • Satellite Paths: A brand new feature, simply tap a satellite in Sky View and reveal the trajectory it will take across the sky! All satellites are included as standard in Night Sky Pro™. AfterCam is a video camera that helps you keep only the memorable moments you’re really after - AFTER they’ve happened. It continuously captures video, but won’t save anything to your photo library until you tell it to. With AfterCam, there’s no need to record hours of video you know you’ll never edit. So, instead of recording your kid's entire game, or seven hours of baby’s ALMOST first steps, record only the highlights to begin with. You simply aim it as if you were recording video; then, when something memorable happens that you want to keep, press one of the number buttons to save the previous 5, 10, or 20 seconds as a video clip. You can also take still photos any time without affecting the video and the controls are duplicated on both sides for easy use with either hand! App Features: - Continuously captures video internally but only saves highlights you want to your photo library - Takes still photos without affecting video capture - Photo browser for playback and management - Controls duplicated on both sides for right- or left-handed use The fatal lab accident occurred in a research laboratory where a scientist was working with genetically modified viruses - the experimentation on humans has been catastrophic. The "Zombie Virus" has now infected hundreds of people and has spread rapidly throughout the city's homeless population. You're our last hope! Shoot all the zombies quickly and make sure they don't overrun the city! • Moving enemies and different bullet velocities give players a real challenge, with extra rewards for clean headshots and zombie killing sprees. • Your mission is to kill as many zombies as you can in each round and to prevent them from entering the safe zone. • Reach higher levels to encounter new types of zombies, and improve on your previous high scores! See the original version of this article on BGR.com
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 Guifi.net; 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.