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Janos Haits

Portal:Computer Science - Wikiversity - 0 views

en.wikiversity.org/...Portal:Computer_Science

programming computer education learning computer science sicence Science research

shared by Janos Haits on 24 Feb 12 - Cached
  • Janos Haits on 24 Feb 12
     
    Portal is a directory of Computer Science pages at Wikiversity. This directory page provides links to Computer Science learning resources that have been developed by the various Wikiversity Computer Science content development projects. The main content development project is the School of Computer Science. This portal features exciting examples of Computer Science learning resources. Wikiversity participants who are interested in Computer Science are invited to create and participate in learning projects and learning resources and help organize them by developing this portal. We're just starting, but we already have some good materials. The Computer Science Portal serves to provide quick access to everything in the Computer Science category.
Erich Feldmeier

@biogarage @marueber Igor Efimov, Sarah Gutbrod: 3-D printer creates transformative dev... - 0 views

www.sciencedaily.com/...140225122223.htm

excellent technology health diybio Biohacking biology innovation interdisciplinarity Science

shared by Erich Feldmeier on 26 Feb 14 - No Cached
  • Erich Feldmeier on 26 Feb 14
     
    "Igor Efimov, Sarah Gutbrod Using an inexpensive 3-D printer, biomedical engineers have developed a custom-fitted, implantable device with embedded sensors that could transform treatment and prediction of cardiac disorders. The 3-D elastic membrane is made of a soft, flexible, silicon material that is precisely shaped to match the heart's outer layer of the wall. Current technology is two-dimensional and cannot cover the full surface of the epicardium or maintain reliable contact for continual use without sutures or adhesives. The team can then print tiny sensors onto the membrane that can precisely measure temperature, mechanical strain and pH, among other markers, or deliver a pulse of electricity in cases of arrhythmi"
Janos Haits

WorldCat knowledge base - 0 views

www.oclc.org/knowledge-base.en.html

worldcat knowledge knowledge base base Science research education technology health

shared by Janos Haits on 27 Feb 14 - No Cached
  • Janos Haits on 27 Feb 14
     
    "The WorldCat knowledge base combines data about your library's electronic resources and linking features that enable access to the content and help you manage the workflows associated with these materials. Unlike data in a traditional knowledge base, WorldCat knowledge base data is not tied to a particular application. Knowledge base data is added and maintained in a single place for use with a growing number of OCLC and non-OCLC services."
Erich Feldmeier

@biogarage @myEN @bdwredaktion #tissueengineering Spinnen spinnen für die For... - 0 views

www.wissenschaft.de/...spinnen-f%C3%BCr-die-Forschung

neurobiology diybio Biohacking biology health Science evolutionsmanagement technology

shared by Erich Feldmeier on 28 Feb 14 - No Cached
  • Erich Feldmeier on 28 Feb 14
     
    "Wussten Sie beispielsweise, dass Spinnenseide fünf Mal reißfester als Stahl, sowie extrem stabil und elastisch ist? Das sind Eigenschaften, die sich die Medizin zu Nutzen machen will. Da die Seide nämlich vom Körper nicht als fremd erkannt wird und daher eine Immunabwehr ausbleibt, arbeiten Wissenschaftler daran, aus dem Material Nerven von Unfallopfern zu rekonstruieren - etwa bei einer Querschnittslähmung. Erste vielversprechende Erfolge können sie im Tierversuch bereits vorweisen. Doch damit nicht genug. Mediziner wollen Spinnenseide außerdem dazu benutzen, künstliche Haut und verschiedene Implantate zu züchten"
Erich Feldmeier

@5eenGeno What is wrong with our bees? - Victorian Apiarists' Association (VAA) - 0 views

www.vicbeekeepers.com.au/t-is-wrong-with-our-bees-.html

Science behaviour biology neurobiology bees

shared by Erich Feldmeier on 20 Mar 14 - No Cached
  • Erich Feldmeier on 20 Mar 14
     
    "Everybody likes a simple cause and effect - something we can point to and say (ommitting a few choice words to the perpetrators), 'Fix this and the bees will be right again.' Reality is rarely so straightforward. As the bee decline has progressed I've lost count of the simple 'causes' that have been presented. Among the more memorable are: * mobile 'phones (the absolute 'definite cause' of choice a couple of years ago) * mobile base stations, power lines and other strong electromagnetic sources (a perennial favourite for any malaise) * alien abduction (hopefully they have smaller probes for abducted bees...) * God's punishment (pro gay-marriage states in the USA have more cases of CCD) Leo's article shows neonicotinoids are at least a plausible candidate and they are surely not good for bees, but the argument for these being the explicit 'cause' of global bee decline is still not particularly strong. The risk here is that the media and vocal lobbyists are going off on a righteous crusade to the detriment of more diligent, and maybe less newsworthy, efforts to get to the root of a complex problem. Rather than reviewing the evidence here, I recommend a visit to Randy Oliver's website where his two recent articles from the American Bee Journalon this topic can be found, along with some further commentary on his home page. Interested readers can also directly access the study by Henry et. al. (2012a), the commentry on this study by Creswell and Thompson (2012), the response to the comment (Henry et. al. 2012b) and to the meta-analysis of toxicological studies on imidacloprid by Creswell (2010). An example of one such study is Cutler and Scott-Dupree (2007). Links to all are included below. These are original material rather than reportage and demonstrate the complexity of the issue. As food for thought, I'll leave you with the following: * Neonicotinoids are widely used in Australia and our bees are not (yet) in decline."
Janos Haits

David Rumsey Historical Map Collection | The Collection - 0 views

www.davidrumsey.com/home

History maps education Research Science geography cartographie map

shared by Janos Haits on 28 Aug 13 - No Cached
  • Janos Haits on 28 Aug 13
     
    "David Rumsey Map Collection Database and Blog. The Map Database has many viewers and the Blog has numerous categories. The historical map collection has over 42,000 maps and images online. The collection focuses on rare 18th and 19th century North American and South American maps and other cartographic materials.
Ivan Pavlov

Did a hyper-black hole spawn the Universe? : Nature News & Comment - 0 views

www.nature.com/...ole-spawn-the-universe-1.13743

science cosmology astronomy black-hole

shared by Ivan Pavlov on 14 Sep 13 - No Cached
  • Ivan Pavlov on 14 Sep 13
     
    In our Universe, a black hole is bounded by a spherical surface called an event horizon. Whereas in ordinary three-dimensional space it takes a two-dimensional object (a surface) to create a boundary inside a black hole, in the bulk universe the event horizon of a 4D black hole would be a 3D object - a shape called a hypersphere. When Afshordi's team modelled the death of a 4D star, they found that the ejected material would form a 3D brane surrounding that 3D event horizon, and slowly expand. The authors postulate that the 3D Universe we live in might be just such a brane - and that we detect the brane's growth as cosmic expansion. "Astronomers measured that expansion and extrapolated back that the Universe must have begun with a Big Bang - but that is just a mirage," says Afshordi.
rexanne8

Dental Supplies Company - 0 views

www.dentalsuppliesexpress.com

dental materials suppliers

shared by rexanne8 on 11 Oct 13 - No Cached
  • rexanne8 on 11 Oct 13
     
    Dental supplies express offers high-quality dental products and materials suppliers at affordable prices in UK. We are a wide range of dentistry and dental healthcare products to the national market.
Erich Feldmeier

Tina Kyndt: Natürlich genmanipulierte Süßkartoffeln - @bdwredaktion - 0 views

www.wissenschaft.de/...6379996

science evolution biology genetics technology sustainability

shared by Erich Feldmeier on 16 May 15 - No Cached
  • Erich Feldmeier on 16 May 15
     
    "Erbgutmanipulation ist keine Erfindung der Gentechnik Agrobacterium tumefaciens Nach erfolgreicher Übertragung bildet sich ein transgenes Zellmaterial, aus dem die Gentechniker durch aufwendige Labormethoden anschließend vollständige Pflanzen generieren können. Sie tragen dann in allen ihren Zellen das transferierte Erbgut. Bisher ging man davon aus, dass genau das bei der natürlichen Genmanipulation der Agrobakterien an ihren Wirtspflanzen nicht passiert. Die Bakteriengene bleiben normalerweise in den Zellen des Befallsorts und werden nicht an die nächste Generation der Wirtspflanze weitergegeben. AdTech Ad Doch die aktuellen Ergebnisse der Forscher um Tina Kyndt von der Universität Ghent belegen, dass es in der Entwicklungsgeschichte der Süßkartoffel offenbar doch zu einem permanenten Einbau der Bakteriengene gekommen ist: Die Forscher fanden im Erbgut der verschiedenen Kulturformen der Süßkartoffel (Ipomoea batatas) sowie in einigen ihrer Wildformen genetisches Material von Agrobakterien"
thinkahol *

Super-high pressures used to create super battery: 'Most condensed form of energy stora... - 0 views

www.sciencedaily.com/...100704162218.htm

super pressures condensed energy

shared by thinkahol * on 08 Jul 10 - Cached
  • thinkahol * on 08 Jul 10
     
    Using super-high pressures similar to those found deep in the Earth or on a giant planet, Washington State University researchers have created a compact, never-before-seen material capable of storing vast amounts of energy.
Maluvia Haseltine

Electron Beams Whip Up A Quantum Tornado - 0 views

www.science20.com/...ron_beams_whip_quantum_tornado

Physics

shared by Maluvia Haseltine on 19 Sep 10 - No Cached
  • Maluvia Haseltine on 19 Sep 10
     
    "A group of researchers have developed what are known as vortex beams - rotating electron beams - which make it possible to investigate the magnetic properties of materials and in the future it may be possible to manipulate the tiniest components in a targeted manner and set them in rotation also."
Barry mahfood

THE PRICE OF RICE! - Transcendence in Bite-Sized Bits: Graphene - Thin is In - 0 views

www.thepriceofrice.com/...graphene-thin-is-in.html

futurism materials nanotechnology science

shared by Barry mahfood on 10 Apr 07 - Cached
  • Barry mahfood on 10 Apr 07
     
    Billed as "the thinnest of all possible materials in the universe," graphene is a one-atom-thick sheet of carbon that looks like "molecular chicken wire."
Walid Damouny

What scientists know about jewel beetle shimmer - 0 views

www.physorg.com/news167585862.html

PhysOrg.com beetles insects pigment polymer colour light optics imaging

shared by Walid Damouny on 24 Jul 09 - Cached
  • Walid Damouny on 24 Jul 09
     
    "Jewel beetles" are widely known for their glossy external skeletons that appear to change colors as the angle of view changes. Now they may be known for something else--providing a blueprint for materials that reflect light rather than absorbing it to produce colors.
Walid Damouny

Diamond coatings are branching out - physicsworld.com - 0 views

physicsworld.com/...39979

PhysicsWorld.com Adamant physics chemistry carbon diamond amorphous crystals crystalline atomic bonds

shared by Walid Damouny on 26 Aug 09 - Cached
  • Walid Damouny on 26 Aug 09
     
    Chris Walker looks at some of the uses of a novel amorphous diamond material.
Charles Daney

After the Transistor, a Leap Into the Microcosm - NYTimes.com - 0 views

www.nytimes.com/...01trans.html

semiconductors moore's law

shared by Charles Daney on 13 Sep 09 - Cached
  • Charles Daney on 13 Sep 09
     
    The shrinking of the transistor has approached fundamental physical limits. Increasingly, transistor manufacturers grapple with subatomic effects, like the tendency for electrons to "leak" across material boundaries. The leaking electrons make it more difficult to know when a transistor is in an on or off state, the information that makes electronic computing possible. They have also led to excess heat, the bane of the fastest computer chips.
Skeptical Debunker

A mini-laboratory for all cases - Research News 03-2010-Topic 5 - Fraunhofer-Gesellschaft - 0 views

www.fraunhofer.de/...mini-laboratory.jsp

mini-laboratory diagnosis disease

shared by Skeptical Debunker on 02 Mar 10 - Cached
  •  »We’ll just have to wait for the results of the laboratory tests.« These words are familiar to many patients. It then usually takes several days for specimens to be sent to the laboratory and analyzed and for the doctor to receive the results. For many illnesses, however, a speedy diagnosis is crucial if the treatment is to be successful. In future, the patient might only have to sit in the waiting room for a few minutes until the results are ready. In a joint project, researchers from seven Fraunhofer institutes have developed a modular platform for in vitro diagnosis which enables various types of bioanalysis – of blood and saliva for example – to be conducted in the doctor’s surgery. »Thanks to its modular design our IVD platform is so flexible that it can be used for all possible bioanalytical tasks,« states Dr. Eva Ehrentreich-Förster from the Fraunhofer Institute for Biomedical Engineering (IBMT) in Potsdam-Golm.The core element of the mini-laboratory is a disposable cartridge made of plastic which can be fitted with various types of sensor. For an analysis the doctor fills the cartridge with reagents – binding agents which indicate the presence of certain substances such as antigens in the specimen material. Various tests or assays are available for different types of analysis. To perform an assay, the doctor only has to place the relevant substances in the cartridge and the test then takes place automatically. »We have optimized the assays so that up to 500 assay reactions can be conducted in parallel in a single analysis step,« explains Dr. Ehrentreich-Förster. Even in the case of complex analyses the doctor obtains a result within about 30 minutes. A new module on the reverse side of the cartridge also makes it possible to analyze the specimen material at DNA level.Once the cartridge has been prepared, the doctor places it in the measurement system. The results can be read out with either optical or electrochemical biosensors. The researchers have installed a readout window for both methods in the measurement system, which features a bypass through which the specimen is pumped.
  • Skeptical Debunker on 02 Mar 10
     
    Many illnesses can be reliably diagnosed through laboratory tests, but these in vitro analyses often use up valuable time. A system developed by Fraunhofer research scientists, which can carry out complex analyses on the spot, will soon be ready for the market.
Walid Damouny

Taming the wild phonon - 0 views

www.physorg.com/news188466491.html

PhysOrg.com phononic phonon crystals heat insulators electricity vibration sound

shared by Walid Damouny on 22 Mar 10 - Cached
  • Walid Damouny on 22 Mar 10
     
    "Researchers at MIT and elsewhere have succeeded in creating a synthetic crystal that can very effectively control the transmission of heat -- stopping it in its tracks and reflecting it back. This advance could lead to insulating materials that could block the escape of heat more effectively than any present insulator."
Infogreen Global

Did you know that the humble robin uses quantum physics? - 0 views

infogreenglobal.com/ble-robin-uses-quantum-physics

magnetic-field quantum

shared by Infogreen Global on 22 Jan 11 - No Cached
  • Infogreen Global on 22 Jan 11
     
    'Quantum information technology is a field of physics aimed at harnessing some of the deepest phenomena in physics to create wholly new forms of technology, such as computers and communication systems,' said Erik Gauger of Oxford University's Department of Materials, an author of the paper.
Andrew Dal

Armstrong Ceiling for my Kitchen - 1 views

I am looking for a suspended ceiling for my kitchen. Since the kitchen is always prone to oil and moisture, I wanted to have a kitchen ceiling that is easy to clean. At Building Materials UK they o...

kitchen ceiling Armstrong

started by Andrew Dal on 28 Feb 11 no follow-up yet
thinkahol *

First 'living' laser made from kidney cell - physics-math - 12 June 2011 - New Scientist - 0 views

www.newscientist.com/...ser-made-from-kidney-cell.html

First 'living' laser made from kidney cell - physics-math 12 June 2011 New Scientist

shared by thinkahol * on 14 Jun 11 - No Cached
  • thinkahol * on 14 Jun 11
     
    It's not quite Cyclops, the sci-fi superhero from the X-Men franchise whose eyes produce destructive blasts of light, but for the first time a laser has been created using a biological cell. The human kidney cell that was used to make the laser survived the experience. In future such "living lasers" might be created inside live animals, which could potentially allow internal tissues to be imaged in unprecedented detail. It's not the first unconventional laser. Other attempts include lasers made of Jell-O and powered by nuclear reactors (see box below). But how do you go about giving a living cell this bizarre ability? Typically, a laser consists of two mirrors on either side of a gain medium - a material whose structural properties allow it to amplify light. A source of energy such as a flash tube or electrical discharge excites the atoms in the gain medium, releasing photons. Normally, these would shoot out in random directions, as in the broad beam of a flashlight, but a laser uses mirrors on either end of the gain medium to create a directed beam. As photons bounce back and forth between the mirrors, repeatedly passing through the gain medium, they stimulate other atoms to release photons of exactly the same wavelength, phase and direction. Eventually, a concentrated single-frequency beam of light erupts through one of the mirrors as laser light.
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