Sentences with phrase «of piezoelectric»

When the wind sways the poles, the stack of piezoelectric disks is forced into compression, thus generating a current through the electrodes.

Windstalk: Within each hollow pole is a stack of piezoelectric ceramic discs.

Specifically, Cagin and his partners from the University of Houston have found that a certain type of piezoelectric material can covert energy at a 100 percent increase when manufactured at a very small size — in this case, around 21 nanometers in thickness.

All that rubbing of your backpack straps on your shoulders may now be put to good use, thanks to straps made of piezoelectric fabric that can convert the friction on your shoulders to electric energy.

In physical rehabilitation, therapeutic ultrasound heats deep tissues and can be used to improve the extensibility of connective tissues, decrease pain and muscle spasms, promote tissue healing, and improve the quality of scar tissue.30 Therapeutic ultrasound units generate an ultrasound wave by applying an electric field to an array of piezoelectric crystals located on the transducer surface.

The piezo - actuated system is composed of the piezoelectric actuator and a positioning mechanism.

In this paper, tracking performance and movement precision of piezoelectric actuator as operating parts of ultra-precision cutting unit is improved using feedback control of inverse - hysteresis model to remove hysteresis property.

This since the Ten tablet PC can well be considered the first to boast of a piezoelectric touchscreen display.

In a piezoelectric fuel injection system, each injector is composed of a stack of piezoelectric ceramic elements.

The microsecond response times of the piezoelectric injectors provide the basis for delivering multiple injections per compression stroke, and thus for lean - burn operation.

Instead of piezoelectric knock sensors positioned in the cylinder block to detect detonation via sound - pressure level, the spark plugs themselves do the knock - sensing — and do it incredibly quickly and directly.

I haven't heard of successful implementation of piezoelectric valve management (no hydraulic), this is now the much anticipated electric vvt and management.

Leaf - like solar panels harvest the sun's rays, while their fluttering harnesses wind power using a series of piezoelectric generators on the underside of each leaf.

The tip - sonicator is a probe made of piezoelectric material that shakes at a low, 20Hz frequency when voltage is applied.

In 2010, physicists put the largest system yet into a superposition: a 40 - micrometre - long strip of piezoelectric material, which expands and contracts in response to voltage changes.

Rather than relying on a strain or an electrical field, the researchers incorporated zinc oxide nanoparticles into a PVDF thin film to trigger formation of the piezoelectric phase that enables it to harvest vibration energy.

It is built out of piezoelectric materials that vibrate when exposed to an electric field.

According to the authors on the paper «Flexible Ionic Devices for Low - Frequency Mechanical Energy Harvesting» published online in the journal Advanced Energy Materials, «The peak power density of our device is in general larger than or comparable to those of piezoelectric generators operated at their most efficient frequencies.»

IDT electrodes are typically placed on top of piezoelectric materials to perform this conversion.

While these champion crystals will certainly boost the sensitivity of piezoelectric devices, scientists were perplexed by how the lead crystals worked so well.

First, he created 20 - centimetre - long flexible ribbons made of a piezoelectric polymer that generates electrical currents when perturbed, either by wind or when rain drops fall on it.

The membrane is compressed slightly, and this change leads to an electrical pulse as a consequence of the piezoelectric effect.

The bullets contain a disk of piezoelectric material that releases electricity on impact; there are no batteries or moving parts.

«The piezoelectric fibres consist of a piezoelectric shell around an electrically conducting core,» Lund says.

Not exact matches

Perhaps even more compelling than the thinness of the material is the fact that it wasn't supposed to have any piezoelectric properties.

«One of world's thinnest piezoelectric materials identified.»

Another group of collaborators, led by Professor Jiangyu Li at the University of Washington in Seattle, tested the material using a state of the art apparatus and proved it was, indeed, piezoelectric.

«Some of Pradeep's prior work identified that pure graphene with triangular holes can effectively become piezoelectric,» Zelisko said.

Now, the M.D. Anderson Chair Professor and mechanical engineering department chairman at the University of Houston Cullen College of Engineering, Pradeep Sharma, and his doctoral student, Matthew Zelisko, in collaboration with scientists at Rice University and University of Washington, have identified one of the thinnest possible piezoelectric materials on the planet — graphene nitride.

Dagdeviren has big plans for the brain implant, and she is developing ideas for piezoelectric - based devices that harvest energy from outside the body, such as from the motions of knees and elbows.

Engineers at the University of Illinois at Urbana - Champaign and Northwestern University teamed up with cardiologists at the University of Arizona to develop what they call piezoelectric nanoribbons, which attach to the outside of the heart muscle, much like a Band - Aid.

«Synthesizing the special mechanism with piezoelectric readout is a big step forward towards commercialization of the technology,» said Neal Hall, an assistant professor in the Cockrell School of Engineering at UT Austin.

A team of University of California scientists is experimenting with an alternative to lead - based compounds in piezoelectric systems

The team's newly designed flexible piezoelectric nanogenerator directly stimulated a living rat's heart using electrical energy converted from the small body movements of the rat.

A research team from the Korea Advanced Institute of Science and Technology (KAIST), headed by Professor Keon Jae Lee of the Department of Materials Science and Engineering at KAIST and Professor Boyoung Joung, M.D. of the Division of Cardiology at Severance Hospital of Yonsei University, has developed a self - powered artificial cardiac pacemaker that is operated semi-permanently by a flexible piezoelectric nanogenerator.

A piezoelectric yarn is made up of 24 fibres each as thin as a strand of hair, with each fibre having an electrically conducting core surrounded by an insulating and piezoelectric polymer.

Researchers often use piezoelectric ceramics because they impart large amounts of electrical charges; however, the brittleness of ceramics makes them unsuitable for prolonged and large vibrational movements.

The team used the strain induced by an electric field applied to a piezoelectric material (which deforms mechanically in response to an electric field) to manipulate the chirality of the domain wall.

The piezoelectric yarn is made up of twenty - four fibres, each as thin as a strand of hair.

White remains cautious, though, and would like to see more work looking at whether some of those 10 watts might be coming from the piezoelectric properties of the tantalum oxide, rather than from its interaction with the droplets.Ten watts would be enough to power a mobile phone, a military radio, a GPS device, even a small laptop, Krupenkin says.

The researchers» analysis showed that the energy output of a 22 - layered piezoelectric structure could be from 5 to 400 times higher than a single - layer piezoelectric polymer of similar dimensions.

The new materials, which generate an electric field when squeezed, copy the crystal structure of conventional piezoelectric materials but use bismuth instead of lead.

A new generation of lead - free piezoelectric materials could lead to greener actuators, sensors and even ultra-dense data storage.

«No one could control the structure of bismuth so that it could perform as well as lead and lead - based compounds as a piezoelectric substance,» he adds.

Although researchers have known for years about bismuth ferrite's piezoelectric properties, it could not be made to produce enough voltage to be considered as a replacement for lead, says Ramamoorthy Ramesh, a professor of physics and of materials science and engineering at U.C. Berkeley who contributed to the research led by Robert Zeches, one of Ramesh's graduate researchers at Berkeley's Department of Materials Science and Engineering.

When a voltage is applied to a so - called piezoelectric crystal, atoms in the crystal lattice stretch, like an accordion, along the direction of the applied electric field.

Cohen and collaborator Huaxiang Fu have developed a computer model that explains the large piezoelectric response of the lead crystals.

The new process, which the researchers have called «acoustowetting,» works on a chip made of lithium niobate — a piezoelectric material capable of converting electrical energy into mechanical pressure.

Part of the excitement is that such flexible piezoelectric crystals would make more sensitive detectors and could improve the resolution of medical devices that use ultrasound.

«Although we made a lot of efforts, there are still small gaps between the side walls of the electrodes and the piezoelectric materials.»