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  • Phys.org - American Institute of Physics
    derivation of pi links quantum physics and pure math In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios Now researchers from the University of Rochester in a surprise discovery Nov 10 2015 in Quantum Physics 21726 25 Electrostrictive polymers Energy harvesting via smart materials Energy harvesting is emerging as a viable method for electronic devices to pull ambient energy from their surrounding environment and convert it into electrical energy for stored power This coveted technology has the potential Jan 26 2016 in Polymers 35 0 Origins of life New model may explain emergence of self replication on early Earth When life on Earth began nearly 4 billion years ago long before humans dinosaurs or even the earliest single celled forms of life roamed it may have started as a hiccup rather than a roar small simple molecular building Jul 28 2015 in Biochemistry 5245 46 Researchers develop technique for integrating III V materials onto silicon wafers A team of IBM researchers in Zurich Switzerland with support from colleagues in Yorktown Heights New York has developed a relatively simple robust and versatile process for growing crystals made from compound semiconductor Jun 08 2015 in Nanophysics 1065 2 New shield makes certain types of searches for physics beyond Standard Model possible for first time The Standard Model of particle physics sometimes called The Theory of Almost Everything is the best set of equations to date that describes the universe s fundamental particles and how they interact Yet the theory has May 12 2015 in General Physics 3958 33 Multiplexing technique for nanoMRI imaging cuts scan time from two weeks to two days NanoMRI is a scanning technique that produces nondestructive high resolution 3 D

    Original URL path: http://phys.org/partners/american-institute-of-physics/ (2016-02-13)
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  • Absorbing acoustics with soundless spirals
    deep subwavelength thickness of our absorber which means that we can deal with very low frequencies meaning very large wavelengths with extremely reduced size structure said Badreddine Assouar a principal research scientist at CNRS in Nancy France Assouar and Li a post doc in his group at the Institut Jean Lamour affiliated with the CNRS and the University of Lorraine describe their work this week in Applied Physics Letters Acoustic absorption systems work by absorbing sound energy at a resonant frequency and dissipating it into heat Traditional acoustic absorbers consist of specially perforated plates placed in front of hard objects to form air cavities however in order to operate at low frequencies these systems must also be relatively thick in length which makes them physically impractical for most applications To remedy this Assouar s group whose previous work consisted of developing coiled channel systems designed an acoustic absorber in which sound waves enter an internal coiled air channel through a perforated center hole This forces the acoustic waves to travel through the channel effectively increasing the total propagation length of the waves and leading to an effective low sound velocity and high acoustic refractive index This allows them to make the absorber itself relatively thin while still maintaining the absorptive properties of a much thicker chamber This is made possible because the coiled chamber s acoustic reactance a property analogous to electrical reactance a circuit s opposition to a change in voltage or current compensates for the reactance of the perforated hole and allows for impedance matching to be achieved This causes all of the acoustic energy to be transferred to the chamber rather than reflected and to be ultimately absorbed within the perforated hole Further applications of such metasurface may deal with the realization of tunable amplitude and phase

    Original URL path: http://phys.org/print374250109.html (2016-02-13)
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  • New method provides direct SI traceability for sound pressure
    against the acoustic unit of sound pressure The optical method can form the basis of a future primary standard for sound pressure measurement which is directly traceable to the SI base units An extensive theoretical and experimental study of the sources of uncertainty would be needed prior to the introduction of such a standard and this work is currently underway Explore further Seeing sound Team develops noninvasive method to visualise sound propagation Journal reference Applied Physics Letters Provided by National Physical Laboratory 16 shares feedback to editors Tweet Favorites Email Print PDF Featured Last comments Popular Detection of gravitational waves would open new window on universe Feb 10 2016 58 Gravitational waves detected 100 years after Einstein s prediction Feb 11 2016 144 Physicists create first photonic Maxwell s demon 15 hours ago 3 GPS tracking down to the centimeter Feb 11 2016 10 A metal that behaves like water Feb 11 2016 2 more Phys org on facebook Relevant PhysicsForums posts Zeno s arrow paradox 1 hour ago Arrows vs plate armor 1 hour ago Wave impedance of free space 1 hour ago Work done on a stationary bycicle 1 hour ago Brainstorming Large scale piezoelectricity generation 3 hours ago free fall acceleration help 3 hours ago More from General Physics Related Stories Seeing sound Team develops noninvasive method to visualise sound propagation November 8 2011 High performance loudspeaker manufacturers have been able to improve sound quality dramatically over the years but still face the issue of dead spots A new generation of acoustic measurements May 29 2012 NPL scientists have made the first measurements of airborne acoustic free field pressures using a laser technique based on photon correlation spectroscopy Acoustic levitation made simple January 5 2015 A team of researchers at the University of São Paulo in Brazil has developed a new levitation device that can hover a tiny object with more control than any instrument that has come before Weighing gas with sound and microwaves January 26 2015 NIST scientists have developed a novel method to rapidly and accurately calibrate gas flow meters such as those used to measure natural gas flowing in pipelines by applying a fundamental physical principle When a sound Have researchers discovered the sound of the stars March 23 2015 A chance discovery by a team of researchers including a University of York scientist has provided experimental evidence that stars may generate sound Recommended for you Most precise measurement of reactor antineutrino spectrum reveals intriguing surprise February 12 2016 Members of the International Daya Bay Collaboration who track the production and flavor shifting behavior of electron antineutrinos generated at a nuclear power complex in China have obtained the most precise measurement Einstein s waves a 100 year odyssey February 12 2016 When Albert Einstein forged the bedrock theory of modern physics 100 years ago he had no computer no internet no printer ballpoint pens and pocket calculators did not exist and few homes had telephones Engineers develop new flat ultralight lens that could

    Original URL path: http://phys.org/news/2015-04-method-si-traceability-pressure.html (2016-02-13)
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  • Density-near-zero acoustical metamaterial made in China
    allow scientists to see fine features of objects such as tumors or minute flaws within airplane wings in industrial testing that may otherwise be unobservable due to an instrument s diffractive limit Additional planned applications include using smart acoustic structures such as logic gates that can control acoustic waves by altering their propagation for communication systems in environmental conditions too extreme for conventional electronic devices and photonic structures The vanishing mass density we ve demonstrated is definitely more than a mathematical trick said Liu Explore further Coke cans focus sound waves beyond the diffraction limit More information Controlling sound transmission with density near zero acoustic membrane network by Yuan Gu Ying Cheng Jingshi Wang and Xiaojun Liu Journal of Applied Physics July 14 2015 DOI 10 1063 1 4922669 Journal reference Journal of Applied Physics Provided by American Institute of Physics 82 shares feedback to editors Tweet Favorites Email Print PDF Featured Last comments Popular Detection of gravitational waves would open new window on universe Feb 10 2016 58 Gravitational waves detected 100 years after Einstein s prediction Feb 11 2016 144 Physicists create first photonic Maxwell s demon 15 hours ago 3 GPS tracking down to the centimeter Feb 11 2016 10 A metal that behaves like water Feb 11 2016 2 more Phys org on facebook Relevant PhysicsForums posts Questions about covalent bond 8 hours ago Refractive index of BEC 10 hours ago Proton electron mass ratio 15 hours ago Hund s cases for diatomic molecules 18 hours ago Where are the electrons near FS spatially distributed in HTS 20 hours ago The motivation of k p method and envelope function method Feb 10 2016 More from Atomic Solid State Comp Physics Related Stories Coke cans focus sound waves beyond the diffraction limit July 12 2011 PhysOrg com When trying to focus sound waves into as small an area as possible scientists run into a fundamental limit called the diffraction limit That is when sound waves are focused into a region smaller than one Designing an acoustic diode November 1 2013 Most people know about ultrasound through its role in prenatal imaging those grainy grey outlines of junior constructed from reflected sound waves A new technology called an acoustic diode envisioned by researchers Scientists twist sound with metamaterials February 25 2014 A Chinese U S research team is exploring the use of metamaterials artificial materials engineered to have exotic properties not found in nature to create devices that manipulate sound in versatile and unprecedented ways New technique allows ultrasound to penetrate bone metal November 20 2014 Researchers from North Carolina State University have developed a technique that allows ultrasound to penetrate bone or metal using customized structures that offset the distortion usually caused by these so called aberrating Scientists bend elastic waves with new metamaterials that could have commercial applications January 22 2015 Sound waves passing through the air objects that break a body of water and cause ripples or shockwaves from earthquakes all are considered elastic waves

    Original URL path: http://phys.org/news/2015-07-density-near-zero-acoustical-metamaterial-china.html (2016-02-13)
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  • New metamaterial manipulates sound to improve acoustic imaging
    to block sound from most angles leaving only a small opening for sound to pass through which might be useful for microphones Shen says Or you could leave it wide open it s extremely flexible Right now the prototype metamaterial is approximately 30 centimeters square and is effective for sounds between 1 and 2 5 kHz Our next steps are to make the structure much smaller and to make it operate at higher frequencies Jing says The paper Broadband Acoustic Hyperbolic Metamaterial was published online Dec 16 in the journal Physical Review Letters Explore further Novel metamaterial vastly improves quality of ultrasound imaging More information Chen Shen et al Broadband Acoustic Hyperbolic Metamaterial Physical Review Letters 2015 DOI 10 1103 PhysRevLett 115 254301 Journal reference Physical Review Letters Provided by North Carolina State University 126 shares feedback to editors Tweet Favorites Email Print PDF Featured Last comments Popular Detection of gravitational waves would open new window on universe Feb 10 2016 58 Gravitational waves detected 100 years after Einstein s prediction Feb 11 2016 144 Physicists create first photonic Maxwell s demon 15 hours ago 3 GPS tracking down to the centimeter Feb 11 2016 10 A metal that behaves like water Feb 11 2016 2 more Phys org on facebook Relevant PhysicsForums posts Zeno s arrow paradox 1 hour ago Arrows vs plate armor 1 hour ago Wave impedance of free space 1 hour ago Work done on a stationary bycicle 1 hour ago Brainstorming Large scale piezoelectricity generation 3 hours ago free fall acceleration help 3 hours ago More from General Physics Related Stories Novel metamaterial vastly improves quality of ultrasound imaging November 8 2010 PhysOrg com New metamaterials can overcome some of the limitations of microscopes and imagers including ultrasound imagers Researchers in the Nano scale Science Engineering Center have come up with a metamaterial Designing an acoustic diode November 1 2013 Most people know about ultrasound through its role in prenatal imaging those grainy grey outlines of junior constructed from reflected sound waves A new technology called an acoustic diode envisioned by researchers New technique allows ultrasound to penetrate bone metal November 20 2014 Researchers from North Carolina State University have developed a technique that allows ultrasound to penetrate bone or metal using customized structures that offset the distortion usually caused by these so called aberrating Soda can array revisited It may not beat the diffraction limit after all April 28 2015 Phys org In 2011 scientists from the Institute Langevin in Paris built an array of 49 empty coke cans that resonate when exposed to an acoustic wave causing the cans to produce sound similar to the way blowing across Density near zero acoustical metamaterial made in China July 14 2015 When a sound wave hits an obstacle and is scattered the signal may be lost or degraded But what if you could guide the signal around that obstacle as if the interfering barrier didn t even exist Recently researchers New metamaterial device solves the

    Original URL path: http://phys.org/news/2015-12-metamaterial-acoustic-imaging.html (2016-02-13)
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  • Acoustic tweezers moves cells in three dimensions, builds structures
    3 D acoustic tweezers can pattern cells with control over the number of cells cell spacing and the confined geometry which may offer a unique way to print neuron cells to create artificial neural networks for neuron science applications or regenerative neuron medicine said Huang The current device can place a cell or particle with 1 micrometer accuracy horizontally and with 2 micrometer accuracy vertically The researchers moved a 10 micrometer particle at an average speed of about 2 5 micrometers per second and could place cells in several seconds to a few minutes depending on the distance Because the acoustic wavelength and input power are instantaneously tunable during experiments the placement accuracy is only limited by the resolution of the device setup according to the researchers Explore further Acoustic tweezers can position tiny objects More information Three dimensional manipulation of single cells using surface acoustic waves PNAS www pnas org cgi doi 10 1073 pnas 1524813113 Journal reference Proceedings of the National Academy of Sciences Provided by Pennsylvania State University 1103 shares feedback to editors Tweet Favorites Email Print PDF Featured Last comments Popular Detection of gravitational waves would open new window on universe Feb 10 2016 58 Gravitational waves detected 100 years after Einstein s prediction Feb 11 2016 144 Physicists create first photonic Maxwell s demon 15 hours ago 3 GPS tracking down to the centimeter Feb 11 2016 10 A metal that behaves like water Feb 11 2016 2 more Phys org on facebook Relevant PhysicsForums posts Zeno s arrow paradox 1 hour ago Arrows vs plate armor 1 hour ago Wave impedance of free space 1 hour ago Work done on a stationary bycicle 1 hour ago Brainstorming Large scale piezoelectricity generation 3 hours ago free fall acceleration help 3 hours ago More from General Physics Related Stories Acoustic tweezers can position tiny objects August 28 2009 PhysOrg com Manipulating tiny objects like single cells or nanosized beads often requires relatively large unwieldy equipment but now a system that uses sound as a tiny tweezers can be small enough to place on a chip Acoustic tweezers capture tiny creatures with ultrasound w Video June 29 2012 A device about the size of a dime can manipulate living materials such as blood cells and entire small organisms using sound waves according to a team of bioengineers and biochemists from Penn State Acoustic cell sorting chip may lead to cell phone sized medical labs October 2 2012 A technique that uses acoustic waves to sort cells on a chip may create miniature medical analytic devices that could make Star Trek s tricorder seem a bit bulky in comparison according to a team of researchers Tilted acoustic tweezers separate cells gently August 25 2014 Precise gentle and efficient cell separation from a device the size of a cell phone may be possible thanks to tilt angle standing surface acoustic waves according to a team of engineers Acoustic tweezers manipulate cell to cell contact December 22 2014 Sound waves

    Original URL path: http://phys.org/news/2016-01-acoustic-tweezers-cells-dimensions.html (2016-02-13)
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  • Artificial black holes made with metamaterials
    international team of astronomers Scientists create artificial mini black hole June 3 2010 PhysOrg com Scientists from China have built a device that can trap and absorb microwaves coming from all directions with a 99 absorption rate a property that makes the device simulate to some extent an astrophysical Imitation black hole seen on earth September 30 2010 Astrophysics deals mostly with things that are so distant thousands or billions of light years away that we can t ever hope to see them up close But clever scientists can do the next best thing to making a light year Recommended for you Most precise measurement of reactor antineutrino spectrum reveals intriguing surprise February 12 2016 Members of the International Daya Bay Collaboration who track the production and flavor shifting behavior of electron antineutrinos generated at a nuclear power complex in China have obtained the most precise measurement Einstein s waves a 100 year odyssey February 12 2016 When Albert Einstein forged the bedrock theory of modern physics 100 years ago he had no computer no internet no printer ballpoint pens and pocket calculators did not exist and few homes had telephones Engineers develop new flat ultralight lens that could change how cameras are designed February 12 2016 Imagine digital cameras or smartphones without the bulky lenses or eyeglasses with lenses that are paper thin New imaging system uses an open ended bundle of optical fibers no lenses protective housing needed February 12 2016 Researchers at the MIT Media Lab have developed a new imaging device that consists of a loose bundle of optical fibers with no need for lenses or a protective housing Announcement Thursday on Einstein s gravitational waves February 8 2016 Scientists are set to make a major announcement Thursday on efforts to pinpoint the existence of gravitational waves or ripples of space and time that transport energy across the universe Scientists glimpse Einstein s gravitational waves Update February 11 2016 In a landmark discovery for physics and astronomy scientists said Thursday they have glimpsed the first direct evidence of gravitational waves ripples in the fabric of space time that Albert Einstein predicted a century 13 comments 2 5 Adjust slider to filter visible comments by rank Display comments newest first Nikola 5 5 4 Nov 16 2010 The headline is misleading panorama 5 5 5 Nov 16 2010 The headline is misleading Aren t most of them when it comes to science reporting Sean W 4 5 5 Nov 16 2010 How much of an improvement is this new simple design over previous methods of doing the same thing Is there anything interesting that has been learned or observed since they first became able to make these black hole analogs How much easier will it be for researchers who want to work with these apparatuses to do so Inquiring minds wouldn t mind knowing Ravenrant not rated yet Nov 16 2010 Amazing since it says it s an EM black hole and that the EM waves don

    Original URL path: http://phys.org/news/2010-11-artificial-black-holes-metamaterials.html (2016-02-13)
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  • Phys.org - wind speed
    expensive business To be able to estimate the profitability of the plants first the wind potential must be determined Fraunhofer researchers have now created a wind measurement Dec 01 2015 in Energy Green Tech 18 0 NASA sees Tropical Storm Olaf moving back to birthplace Tropical Storm Olaf is leaving the Central Pacific Ocean and is headed home that is back to the Eastern Pacific Ocean where it developed 12 days ago NASA s RapidScat satellite observed the winds in Olaf as it was headed Oct 26 2015 in Earth Sciences 16 0 NASA provides an infrared look at Hurricane Joaquin over time A series of NASA infrared images of Hurricane Joaquin from October 1 to 6 show the development and movement of the storm and its moisture stream into South Carolina Oct 07 2015 in Earth Sciences 24 0 SMOS meets ocean monsters ESA s SMOS and two other satellites are together providing insight into how surface winds evolve under tropical storm clouds in the Pacific Ocean This new information could to help predict extreme weather at sea Sep 30 2015 in Earth Sciences 17 0 Predicting tornadoes months or even seasons in advance A new model for predicting tornado activity could allow experts to prepare forecasts months or even seasons in advance researchers at the University of Toronto say Sep 11 2015 in Earth Sciences 114 0 Study reveals how distinctive termite mounds are ventilated could offer lessons to human architects As animal architects go the average termite doesn t have many tools at their disposal just their bodies soil and saliva And as guidance variations in wind speed and direction and daily fluctuations in temperature as Sep 02 2015 in Plants Animals 534 0 Improved hurricane models could save lives money The 2005 Atlantic Coast hurricane season

    Original URL path: http://phys.org/tags/wind+speed/ (2016-02-13)
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