Navigation Links
Not only invisible, but also inaudible
Date:12/20/2011

This press release is available in German.

Progress of metamaterials in nanotechnologies has made the invisibility cloak, a subject of mythology and science fiction, become reality: Light waves can be guided around an object to be hidden, in such a way that this object appears to be non-existent. This concept applied to electromagnetic light waves may also be transferred to other types of waves, such as sound waves. Researchers from Karlsruhe Institute of Technology (KIT) have now succeeded in demonstrating for the first time an invisibility cloak for elastic waves. Such waves also occur in strings of a guitar or drum membranes.

It is as if Harry Potter had a cloak that also makes him unhearable. "Maybe a place of peace and quiet in the Christmas season," say the KIT researchers, who succeeded in transferring the concepts underlying the optical invisibility cloak to acoustic waves in a plate.

"The key to controlling waves is to specifically influence their local speed as a function of the 'running direction' of the wave," says Dr. Nicolas Stenger from the Institute of Applied Physics (AP). In his experiment, he used a smartly microstructured material composed of two polymers: A soft and a hard plastic in a thin plate. The vibrations of this plate are in the range of acoustic frequencies, that is some 100 Hz, and can be observed directly from above. The scientists found that the sound waves are guided around a circular area in the millimeter-thin plate in such a way that vibrations can neither enter nor leave this area. "Contrary to other known noise protection measures, the sound waves are neither absorbed nor reflected," says Professor Martin Wegener from the Institute of Applied Physics and coordinator of the DFG Center for Functional Nanostructures (CFN) at KIT. "It is as if nothing was there." Both physicists and Professor Martin Wilhelm fr
'/>"/>

Contact: Monika Landgraf
presse@kit.edu
49-721-608-47414
Helmholtz Association of German Research Centres
Source:Eurekalert

0

GOOD

Page: 1 2

Related biology news :

1. The inaudible symphony analyzed
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/21/2013)... have charted the path of insulin action in cells ... comprehensive blueprint for understanding what goes wrong in diabetes. ... and Professor David James from Sydney,s Garvan Institute of ... edition of the prestigious journal Cell Metabolism . ... a very important role in the body because it ...
(Date:5/20/2013)... 20, 2013) University of Minnesota Medical School researchers ... partnership with the University,s Brain Tumor Program, have developed ... tumors (MPNST) that allow them to discover new genes ... The research was published this week in the journal ... transposon method, researchers in the lab of David Largaespada, ...
(Date:5/20/2013)... National Science Foundation (NSF) planning grant will help establish ... joint program of the University of Illinois at Urbana-Champaign ... "CARD will be devoted to research in drying moist, ... forestry and paper products; chemical products; textiles; and biopharmaceuticals," ... food science and human nutrition and the Illinois site ...
Breaking Biology News(10 mins):Insight into the dazzling impact of insulin in cells 2Insight into the dazzling impact of insulin in cells 3U of M researchers develop model for better testing, targeting of MPNST 2NSF approves planning grant for Center for Advanced Research in Drying 2
... LANSING, Mich. An engineering researcher and a global ... bringing a low-cost, hand-held device to nations with limited ... Syed Hashsham, a professor of civil and environmental ... is operated using an iPod Touch or Android-based tablet ...
... that the salmon are biting less, there are less of ... researcher at the University of Oviedo (Spain). The study, ... shows a "very marked" decline in Atlantic salmon ( Salmo ... (Asturias, northern Spain), especially during the last decade, almost simultaneously ...
... Washington, DC (August 26, 2011) African Americans are four ... new study has found that a condition that occurs when ... contributes to this increased risk. The study, conducted ... appears in an upcoming issue of the Journal of ...
Cached Biology News:Hand-held unit to detect cancer in poorer countries 2The same number of fishermen, but less salmon in Spanish rivers 2
(Date:5/21/2013)... 21, 2013 Many have long discussed ... to acne. Recently physicians from Clinical Psychiatry.com ... on the skin, and suggested using hypnotherapy ... chemicals produced from stress that cause acne. , Doctors ... feelings acne brings about, stress causes changes in the ...
(Date:5/21/2013)... 21, 2013  MacroGenics, Inc. today announced that ... (MGAH22), an Fc-modified chimeric monoclonal antibody (MAb), in ... oncoprotein," will be presented at the 2013 Annual ... during the Developmental Therapeutics - Immunotherapy Oral Abstract ... 4:30 PM.  The presentation will describe the results ...
(Date:5/21/2013)... 2013  Personal Genome Diagnostics Inc. (PGDx), today ... and expertise in genomic analysis of defined cancer ... with Blueprint Medicines.  PGDx is an innovator in ... in tumors, and Blueprint Medicines is an expert ... genetically defined patient population. "This collaboration ...
(Date:5/21/2013)... (PRWEB) May 21, 2013 Revolutionary Science, ... automatic colony counter, announced today that they have expanded ... products , the IncuCount, IntelliCount, InCount and ImpressCount. ... sophistication are especially useful in food microbiology and pharmaceutical ... an updated look. A bright white enclosure with ...
Breaking Biology Technology:Adult Acne Treatment, Probiotic Action Explains How Hypnotherapy and Probiotics May Cure Various Skin Conditions 2MacroGenics Announces Margetuximab (MGAH22) Phase 1 Data Presentation at ASCO; Initiates Phase 2 Clinical Study to Evaluate Activity of Margetuximab in Patients with Metastatic Breast Cancer 2MacroGenics Announces Margetuximab (MGAH22) Phase 1 Data Presentation at ASCO; Initiates Phase 2 Clinical Study to Evaluate Activity of Margetuximab in Patients with Metastatic Breast Cancer 3Personal Genome Diagnostics And Blueprint Medicines Form Collaboration to Identify Novel Kinase Targets 2Personal Genome Diagnostics And Blueprint Medicines Form Collaboration to Identify Novel Kinase Targets 3Revolutionary Science Announces New Automatic and Manual Colony Counting Products 2
... ... been selected by Prometheus as the sample collection kit for MyCeliacID™ a saliva-based genetic ... service as it solves sample collection challenges inherent with traditional collection methods which are ... ...
... CANTON, Mass., Aug. 18 Metabasis, a San Diego-based ... R&D equipment that is no longer essential to their ongoing ... and listed the premium lab and analytical equipment on the ... , , Metabasis is a biotech firm, ...
... , , ATLANTA, Aug. 18 ... medical device and cardiovascular tissue processing company, today announced the first ... FDA clearance. The surgeries were performed on pediatric patients at ... MI by Richard G. Ohye, M.D., associate professor of surgery, ...
Cached Biology Technology:DNA Genotek Sample Collection Kit Selected by Prometheus for MyCeliacID™ Genetic Test 2DNA Genotek Sample Collection Kit Selected by Prometheus for MyCeliacID™ Genetic Test 3Massive Inventory of Premium Lab & Analytical Equipment Now Available 2CryoLife Announces Implants of First FDA-Cleared SynerGraft(R) Processed Human Cardiac Patch Material 2CryoLife Announces Implants of First FDA-Cleared SynerGraft(R) Processed Human Cardiac Patch Material 3CryoLife Announces Implants of First FDA-Cleared SynerGraft(R) Processed Human Cardiac Patch Material 4
... Tecans state-of-the-art software for all your biopharmaceutical ... in a single, scalable software package. The ... simplifying the control of all Freedom instruments ... EVO 100 with one liquid handling arm ...
...
... The Synaptic Vesicles Isolation Kit provides ... an enriched synaptic vesicle fraction. The ... lysis of the synaptosomes, and differential ... gradient. The kit also contains an ...
... hybridization incubators with rotators. Graduated, 35 ... PP plug-seal screw-cap with O-ring for ... lengths to accept different size hybridization ... available separately. • Comp Dim: tube ...
Biology Products: