Benedikt M.,University of Oxford |
Puppis G.,French National Center for Scientific Research |
Vu H.,Science Park
Information and Computation | Year: 2015
Higher-order transformations are ubiquitous within data management. In relational databases, higher-order queries appear in numerous aspects including query rewriting and query specification. This work investigates languages that combine higher-order transformations with ordinary relational database query languages. We study the two most basic computational problems associated with these query languages - the evaluation problem and the containment problem. We isolate the complexity of evaluation at every order, in an analysis similar to that for that standard typed lambda calculus. We show that the containment problem (and hence, the equivalence problem) is decidable in several important subcases, particularly in the case where query constants and variables range over the positive relational operators. The main decidability result relies on techniques that differ from those used in classical query containment. We also show that the analysis of higher-order queries is closely connected to the evaluation and containment problems for non-recursive Datalog. © 2015 Elsevier Inc. Source
Ebong A.,University of North Carolina at Charlotte |
Solar X.,Science Park |
Zhou T.,Shanghai Shengzhou New Energy Development Co.
2012 9th International Conference on High Capacity Optical Networks and Enabling Technologies, HONET 2012 | Year: 2012
Solar electricity is an attractive resource that can be tapped without exhaustion. However, solar cell, the device which converts sunlight into electricity must be cost effective to encourage widespread use of solar electricity. Cost-effective solar cell can be achieved through material usage, efficiency and economy of scale. The economy of scale has been employed since 2004 with production capacities in the 1 GW range for several companies, but the efficiency is not high enough because of the limitations in the current metallization technology. The alternative technologies, such as laser opening and plate, extrusion, laser transfer process, inkjet and aerosol seed and plate investigated by several researchers are still far away from production ready. The inkjet metallization is an alternative that is very promising because of the associated precision in material usage in creating fine and uniform gridlines for reduced shading. Efficiencies of >19% and 17.4%, respectively, on mono and multi-crystalline cells, have been demonstrated using the same process as with the screen-printing technology. In this paper the results of digital inkjet metallization of multi-crystalline silicon solar cell is presented, for the first time, with efficiency of 17.4%. The technology roadmap to achieve lower-cost and higher efficiency multi-crystalline solar cells is also presented. © 2012 IEEE. Source
News Article | December 11, 2015
When German and Chinese automotive powers combine, they can end up beating Silicon Valley's best and brightest. Baidu, often touted as China's Google, has partnered up withBMW to create its first autonomous vehicle. The company reports that it just completed the first successful tests of its driverless car through the streets of Beijing. Using a revamped BMW 3 Series, Baidu's road tests included a complex set of driving instructions while the vehicle had to respond to its surroundings. "Fully autonomous driving under mixed road conditions is universally challenging, with complexity further heightened by Beijing's road conditions and unpredictable driver behavior," says Wang Jing, the SVP of Baidu and General Manager of Baidu's Autonomous Driving Business Unit. Previously, however, Baidu's chief scientist Andrew Ng had a close call in one of the autonomous vehicles. Proving that anything can happen and that it will happen, another vehicle had suddenly swerved in front of the driverless car with Ng in the passenger seat. "I was glad our driver hit the brakes, but then I found out it was the car that did it automatically," Ng said. "If I had been driving, we would have hit the car in front." In its latest successful test drive, Baidu's BMW 3 Series came equipped with software the company calls Baidu AutoBrain. The software serves as the core of Baidu's driverless car technology which makes use of highly automated driving maps, positioning, detection, and smart decision making and control. The technology thus helped the BMW maneuver the 18.6-mile route that began at Baidu's Beijing corporate offices near Zhongguancun Science Park in Haidian District, through to the G7 highway, Fifth Ring Road, Olympic Park, and finally rerouting back to where it began at Baidu's homebase. Along the way, the Baidu's car traversed across side streets, made left and right turns, switched lanes, and overtook other regular cars, even merging onto and off traffic along highways as fast as 62mph. In development since 2013, Baidu joins Google, and Tesla in the race to bring self-driving vehicles to the masses.
In case you missed it (ICYMI), here are some of the stories that made headlines in the world of cleanrooms and nanotechnology in the past week: The City Plan Commission of New Haven, Conn. , has approved a site plan that will now permit a drug development company to install a mobile cleanroom in its Science Park for the purpose of developing a possible malaria vaccine. The city report states that the cleanroom will serve as “a temporary pharmaceutical compounding laboratory for the production of ACT’s new synthetic malaria vaccine in a sterile environment for human clinical trials.” Artificial Cell Technologies Inc., which develops drugs based on multilayer polypeptide nanofilm technology, plans to utilize the mobile cleanroom for anywhere from six months to two years. Material scientists at have found certain metal oxides increase capacity and improve cycling performance in lithium-ion batteries. The team synthesized and compared the electrochemical performance of three graphene metal oxide nanocomposites and found that two of them greatly improved reversible lithium storage capacity. The method can deposit most types of MOs onto the same prefabricated 3D graphene structure, allowing for direct comparison of electrochemical performance of a wide range of GMOs. Finally, have figured out how to replace the surface ions of copper oxide nanocrystals at ambient conditions, which will simplify nanocage production. Ionic semiconductor nanocages can be utilized as photoelectric conversion materials like those used in solar panels. Like a cage in the literal sense, nanocages can also encapsulate drugs and enzymes, which promises further developments for targeted drug delivery.
This collection of exhibits at the intersection of science and art should keep you entertained during the cold winter months, no matter where you are in the country. Get out of the house and enjoy! FRAGILE BEAUTY: The Art & Science of Sea Butterflies on view indefinitely Smithsonian Museum of Natural History 1st Floor, Center, Sant Ocean Hall, Research Case 10th St. & Constitution Ave. NW Washington, D.C. Artist Cornelia Kubler Kavanagh and biological oceanographer Gareth Lawson bring the plight of tiny ocean pteropods—or “sea butterflies” —to light with larger-than-life sculptures. Kavanagh’s sculptures are based on tiny sea snails no bigger than a grain of sand. They honor the floating beauty of these animals, while evoking their struggle to survive in the face of ocean acidification. Gareth Lawson, from the Woods Hole Oceanographic Institution, studies ocean acidification and provided research that inspired Kavanagh’s creative work. REVEALING THE INVISIBLE: The History of Glass and the Microscope April 23, 2016 to March 19, 2017 The Corning Museum of Glass One Museum Way Corning, NY Glass made it possible for scientists and artists to see tiny living creatures once invisible to the human eye. Revealing the Invisible: The History of Glass and the Microscope tells the stories of scientists’ and artists’ exploration of the microscopic world between the 1600s and the late 1800s. Their discoveries fed people’s hunger to learn more about nature, increasing the popularity of microscopes and driving improvements in scientific glass. These advances culminated in the 19th century with the advent of modern scientific glassmaking and the perfection of the microscope. Unleash your sense of discovery as you explore the invisible through historic microscopes, rare books, and period illustrations. View the artworks of 23 artists who were selected from more than 100 entrants from around the world for this year’s science-inspired exhibition about biodiversity and extinction. The co-jurors for this exhibition were Elizabeth Corr, manager of art partnerships at the Natural Resources Defense Council, and Paula J. Ehrlich, president & CEO of the E.O. Wilson Biodiversity Foundation. This exhibition is the 17th International Art-Science Juried Exhibition organized by Art & Science Collaborations, Inc. (ASCI). Artists can use their skills and imagination to take on the issue of climate change and this work is now being seen in unprecedented numbers. The artists in Tipping Points use a variety of mediums including painting, photography, video, sculpture and drawing. Some have been partnering with scientists and environmental organizations. Others have been researching and documenting changes in glaciers and diminishing ice on trips to far northern regions of the planet; including boat trips to the Arctic and Antarctic. Some take a more poetic and imaginative approach to confront the seriousness of the issue and single biggest challenge of our time. HISTORICAL ILLUSTRATIONS OF SKIN DISEASE: Selections from the New Sydenham Society Atlas 1860-1884 September 17, 2015 - January 10, 2016 Cushing/Whitney Medical Library Sterling Hall of Medicine 333 Cedar Street New Haven, CT In this exhibit, Yale dermatologists Jean Bolognia and Irwin Braverman present the celebrated nineteenth century illustrations to a current clinical audience, making a relevant teaching point with each plate. Twenty-five of the Atlas’ forty-nine plates are selected for display. They depict cutaneous diseases ranging from the common, e.g. psoriasis and eczema, to the rare, e.g. iododerma and systematized epidermal nevi. Examples of skin signs of systemic disease, including Addison’s disease, neurofibromatosis, and lupus erythematosus, are also shown. The emotional toll which these chronic diseases inflicted upon patients is a striking feature of the many portraits on view. This innovative new exhibition, Emergence: Craft + Technology, features work that exemplifies the ever-increasing intertwining of advanced digital processes with traditional hand-made craft. Whether through the use of computer design programs, CNC and automated tools, or 3D printing, we celebrate the use of new technologies in the production of state-of-the-art craft. MACRO OR MICRO?: Challenging our Perceptions of Scale Museum of Science Art & Science Gallery 1 Science Park Boston, MA Today, researchers study the Earth at a variety of scales and with a variety of advanced equipment. While satellites take images of entire landscapes, electron microscopes use a beam of electrons to magnify objects up to 500,000 times. The resulting images, which differ in scale of a million times or more, are featured side-by-side in Macro or Micro? Challenging our perceptions of scale. Geographer Stephen Young and biologist Paul Kelly, both with Salem State University, have gathered compelling images from their scientific research to test viewers' perceptions of the Earth. Challenge yourself to determine the scale of these stunning images — the patterns and similarities between macro and micro views may surprise you. Artist and ocean advocate Courtney Mattison creates large scale ceramic installations and sculptures inspired by science and marine biology. Her intricate hand-crafted porcelain works celebrate the fragile beauty of endangered coral reef ecosystems and promote awareness to conserve and protect our natural world. Origin of the Universe. Evolution of the Universe. String Theory. Dark Matter. Dark Energy. Multiverse. Unification of Space + Time. Our Solar System. Cultural Cosmology. Art.Science.Gallery.’s science-inspired printmakers explore the cosmos in this far out exhibition for PrintAustin 2016, a city-wide printmaking festival. BIRDS OF TENNESSEE: Celebrating the Centennial of the Tennessee Ornithological Society October 5, 2015 - TBD McClung Museum of Natural History & Culture University of Tennessee, Knoxville 1327 Circle Park Drive Knoxville, TN To celebrate the centennial of the Tennessee Ornithological Society (TOS), the museum is displaying fifty-six engravings and lithographs featuring the birds of Tennessee. Spanning two hundred years from 1731 to 1931, the prints on view are by twelve artists: Eleazar Albin, Mark Catesby, Xaviero Manetti, Alexander Wilson, Titian Ramsay Peale, Alexander Rider, Prideaux John Selby, John James Audubon, John Gould, Daniel Giraud Elliot, Henry Eeles Dresser, and Rex Brasher. The works on view are drawn from the museum’s extensive collection of over three thousand ornithological prints and are on display in the pull-out drawer case in the entrance to the Decorative Arts gallery. 25 Years of the Hubble Space Telescope July 12, 2015 - January 17, 2016 Museum of Arts and Sciences 4182 Forsyth Road Baton Rouge, LA Since its launch in April 1990, the Hubble Space Telescope (HST) has provided stunning images of far-away stars, galaxies, and nebulae, and has shed light on many of the great mysteries of the universe. Today, HST continues to provide views of cosmic wonders never before seen. This exhibit displays some of the most intriguing images taken by HST over the past 25 years. CONDENSED MATTER COMMUNITY by appointment through January 2016 Synchrotron Radiation Center: Home of Aladdin 3731 Schneider Dr. Stoughton, WI Condensed Matter Community is a site-specific curatorial project organized by Kristof Wickman and Evan Gruzis intended to generate a dialogue about science, aesthetics, progress and entropy. The project uses the site of a decommissioned particle accelerator facility in rural Wisconsin, The Synchrotron Radiation Center: Home of Aladdin, as an exhibition space to frame a selection of artworks, prior to forthcoming experiments. NUMBERS IN NATURE: A Mirror Maze new permanent exhibit Museum of Science and Industry 5700 S. Lake Shore Drive Chicago, IL Patterns are everywhere if you know where to look! From the delicate nested spirals of a sunflower’s seeds, to the ridges of a majestic mountain range, to the layout of the universe, mathematical patterns abound in the natural world. Numbers in Nature: A Mirror Maze is a new permanent exhibit that will expose and explain the patterns that surround us. As you enter Numbers in Nature, lenticular images and an immersive large-format film reveal these repeating patterns hidden throughout nature: spirals, occurrences of the "golden ratio" (), Voronoi patterns, and fractal branching. You will even discover patterns and ratios found in your own body and in centuries of music, art, and architecture so that you'll never look at the world the same way again. This exhibition explores the relationship between culture and nature, one of the oldest human tropes. In this recurring schism, humans believe ourselves to be of nature and, alternately, distinct from it. As we search texts and traditions to support either position, the persistence of the trope itself is underscored; it’s an impasse, shifting in form. It’s also an embrace of or a resistance to the natural world that produced us; from which we believe we stand apart. In Raw and Cooked, artists Jim Jacobs, Joshua Winegar, and Paul Crow present work within this nature/culture dialectic. Jacobs begins with an ancient horticultural intervention, the graft, to focus our attention on a literal intersection of the natural and the human-made. Winegar takes on the natural world as a partner in a conversation with his psyche, alternately responding to, and intervening in, the world which surrounds him. Crow maps the span of his life onto the time frame of the human awareness of global climate change. Each artist begins with material that exists before agency and brings it through a process of intervention to manifest a hybrid: the artist in dialogue both with the world and without, and with an inner understanding of that world. ATOMS + BYTES: Redefining Craft in the Digital Age March 4 – June 26, 2016 Bellevue Arts Museum 510 Bellevue Way NE Bellevue, WA Today's makers have access to a wider array of tools, materials, and processes than ever before. Digital methods such as scanning and imaging, coding, CNC-milling, and rapid prototyping not only influence the way objects are designed, manufactured, and distributed, but also change the terms of our relationships with them. Atoms + Bytes: Redefining Craft in the Digital Age will showcase works by 30 international and local makers situated at the intersection of the digital and the analogue worlds. These artists, craftspeople, and designers excel in material practices that span millennia of craft traditions, while drawing on cutting-edge digital tools to develop innovative ways of making. The integration of these atoms and bytes, building blocks of matter and information, generates the new forms and typologies that shape our changing world. Through the presentation of works that embody mergers of traditional and digital processes and materials, Atoms + Bytes reframes the conversation about the place of technology within the historical trajectory of object-making and offers an invitation to reevaluate the way we place value on craft and define "hand-made." FIRES OF CHANGE November 19, 2015 – April 3, 2016 University of Arizona Museum of Art 1031 North Olive Road Tucson, AZ The worlds of art and fire science come together in Fires of Change. Curated by Flagstaff installation artist Shawn Skabelund, Fires of Change explores the increase in severity, size, and number of wildfires in the Southwest and their impact on the landscape through the eyes of artists. Through the art, visitors can get a sense of the true impact of the fires, from human to environmental. Fires of Change is an NEA and Joint Fire Science Consortium funded exhibition originating at the Coconino Center for the Arts in Flagstaff. Eleven artists spent a week in 2014 in fire science boot camp with the Southwest Fire Science Consortium and the Landscape Conservation Initiative to learn about the impact of wildfire in Northern Arizona. They then spent the year creating original works in reaction to their experiences. CALIFORNIA FLORA: Botanical Paintings in Colored Pencil by Nina Antze January 7, 2016 – April 25, 2016 Please call ahead 707-527-9277 x 107 to see exhibit Heron Hall, Laguna Environmental Center 900 Sanford Road, Santa Rosa, CA California Flora is an exhibit of botanical paintings by colored pencil artist Nina Antze. The paintings were created over the past eight years and focus mainly on California natives. Also included are paintings documenting Luther Burbank’s Experiment Farm in Sebastopol and a piece from the Alcatraz Florilegium, a documentation of the plants of the Alcatraz gardens. Nina Antze is a botanical artist and quilt maker living in Northern California. She has a degree in Fine Art from San Francisco State University and has a Certificate in Botanical Illustration from the New York Botanical Gardens. She teaches Colored Pencil classes in the Botanical Certificate Program at Filoli Gardens, at the Sebastopol Center for the Arts and around the Bay Area. Her botanical paintings and colored pencil drawings have been exhibited in New York, at the Huntington Library, and at Filoli Gardens and her quilts have won numerous awards. She works in colored pencil, watercolor pencil and fabric. Her botanicals can be viewed at her website, www.pcquilt.com THE ALCATRAZ FLORILEGIUM: A Special Botanical Art Exhibit January 16 - 29, 2016 University of California Botanical Garden at Berkeley 200 Centennial Drive Berkeley, CA The Northern California Society of Botanical Artists (NCSBA) in collaboration with the Golden Gate National Parks Conservancy and the Garden Conservancy has created a florilegium, a series of botanical paintings, to document the plants of The Gardens of Alcatraz. The UC Botanical Garden is thrilled to welcome the NCSBA to exhibit this special showing of the Alcatraz Florilegium, with over 70 drawings and paintings, in our beautiful Julia Morgan Hall. TENTACLES: The Astounding Lives of Octopuses, Squid, and Cuttlefishes April 12, 2014 - September 2016 Monterey Bay Aquarium 886 Cannery Row Monterey, CA Journey to a world of undersea magicians, masters of disguise and quick-change artists. Our special exhibition is the largest, most diverse living exhibit ever created to showcase these amazing animals. You won't believe your eyes. A walk from Mount Diablo to the Hayward shoreline would cross through many ecosystems, each with their own unique set of inhabitants. Some of these creatures have very specific needs and limited ranges. Others are more adaptable and seem perfectly at home in an urban backyard. This collection of work by science illustrator Lucy Conklin explores the vast array of wildlife in the East Bay, and some of our unusual visitors. Whether they are long time residents, returning to their natural habitat after a long hiatus, or an oddity passing through unexplained, their journeys have a story. Creative inspiration is at the heart of both science and art – and our array of indoor and outdoor art installations blend art and science in delightful and insightful ways. Current installations include: BEAM Robot Fish: Controlled by solar cells, this BEAM robot sculpture (Biology, Electronic, Aesthetics, Mechanics) is designed to live, feed and fend for itself in the ocean. Cloud: Check out this mesmerizing art installation composed of hundreds of rotating glass panels designed to mimic the changes of state from solid to liquid to gas. Jacquard Coverlet: Marvel at this wall hanging woven on our antique Jacquard loom by volunteers. Like a computer, the loom’s mechanism uses binary to create the pattern. Do you know of any exhibits or have an upcoming exhibit that should be included on this list? Send me an email at symbiartic (dot) km (at) gmail (dot) com, or tweet me @eyeforscience with the deets. If it's scienceart related, it's fair game.