'The energy harvester consists of a carbon fiber beam with a piezoelectric sensor and stepper motor to adjust the angle of attack of the airflow in the wind tunnel. Unlike previous designs, the system does not require a secondary vibrating structure because the beam itself vibrates, reducing the volume of the harvester and increasing its efficiency.'
' ... The researchers demonstrated the design using a flexible cantilever beam with a piezoelectric transducer, which they hung from the ceiling in a wind tunnel. They found that the amount of energy harvested depends on a combination of factors, including the wind speed and the angle at which the wind hits the beam. At a wind speed of 10 m/s and 5.4° angle, the method can harvest approximately 0.3 mW of power. Although the researchers plan to improve the power levels, even this small value can be used to power individual sensors, which, as Zakaria explained, have a wide variety of applications.
"Future monitoring of different systems and platforms such as air and water systems, structures, vehicles, infrastructure, etc., as well as secure data transmission and reception from these sensors, will require the use of hundreds or thousands of sensors, data loggers and hardware components," Zakaria said. "The ability to integrate energy harvesters within these sensors or data loggers to develop such self-powered instruments is very much needed to enable their use without the need to replace batteries on a regular basis."
In the future, the researchers plan to design even smaller beams with specific geometries and capabilities, as well as to improve the performance of the piezoelectric elements.
The wave equation is a partial differential equation that describes the propagation of various types of waves.
The equation appears throughout many fields in physics, including acoustics, fluid dynamics, electromagnetism, and quantum mechanics. With some modifications, it can even describe the spread of traffic jams on busy highways!
The one-dimensional equation was first discovered by d’Alembert in 1746 as he studied how vibrations propagated through a string, and the two- and three-dimensional equations were solved soon after by Euler during his study of acoustics.
The simulations above show the propagation of a disturbance on a two-dimensional surface for two different sets of boundary conditions.
Mathematica code here (https://gist.github.com/BrianWeinstein/7c38a5040f7eb1b56b04)
' ... The 465-foot vessel takes luxury to eye-popping new heights. [...] Two pools, two movie theaters, two helipads, a garage, multiple gym facilities, and a bi-level pool area merely scratch the surface of what this incredible boat will offer. [...] The Italian Sea Group project was dreamed up by Dobroserdov Design in a partnership with Admiral Centro Stile. ... '
' ... Sometimes a work of art is so dazzlingly famous that it can blind people to its original context and meaning. That surely is the case with Vincent Van Gogh’s Sunflowers. ... '
'... Lasers could be far more energy-efficient than LEDs: While LED-based lighting produces up to about 150 lumens per watt of electricity, lasers could produce more than 400 lumens per watt, says Cun-Zheng Ning, a physicist and electrical engineer at Arizona State University at Tempe who worked on the laser. In addition, he says that white lasers could also lead to video displays with more vivid colors and higher contrast than conventional displays.
Another important potential application could be "Li-Fi", the use of light to connect devices to the Interenet. Li-Fi ould be 10 times faster than today’s Wi-Fi, but "the Li-Fi currently under development is based on LEDs," Ning says. He suggests white-laser based Li-Fi could be 10 to 100 times faster than LED-based Li-Fi, because the lasers can encode data much faster than white LEDs.
A monolithic white laser : Nature Nanotechnology : Nature Publishing Group
'... Monolithic semiconductor lasers capable of emitting over the full visible-colour spectrum have a wide range of important applications, such as solid-state lighting, full-colour displays, visible colour communications and multi-colour fluorescence sensing. The ultimate form of such a light source would be a monolithic white laser. However, realizing such a device has been challenging because of intrinsic difficulties in achieving epitaxial growth of the mismatched materials required for different colour emission. Here, we demonstrate a monolithic multi-segment semiconductor nanosheet based on a quaternary alloy of ZnCdSSe that simultaneously lases in the red, green and blue. This is made possible by a novel nanomaterial growth strategy that enables separate control of the composition, morphology and therefore bandgaps of the segments. Our nanolaser can be dynamically tuned to emit over the full visible-colour range, covering 70% more perceptible colours than the most commonly used illuminants.
' ... The vulnerability affects about 950 million Android phones and tablets, according to Joshua Drake, vice president of platform research and exploitation at security firm Zimperium. It resides in "Stagefright," an Android code library that processes several widely used media formats. The most serious exploit scenario is the use of a specially modified text message using the multimedia message (MMS) format. All an attacker needs is the phone number of the vulnerable Android phone. From there, the malicious message will surreptitiously execute malicious code on the vulnerable device with no action required by the end user and no indication that anything is amiss. ... '
'An international team of researchers has demonstrated for the first time that a single molecule can operate as a field-effect transistor when surrounded by charged atoms that operate as the gate. The team published its results in the August 2015 issue of the journal Nature Physics. '
Gating a single-molecule transistor with individual atoms : Nature Physics : Nature Publishing Group
'... Transistors, regardless of their size, rely on electrical gates to control the conductance between source and drain contacts. In atomic-scale transistors, this conductance is sensitive to single electrons hopping via individual orbitals1, 2. Single-electron transport in molecular transistors has been previously studied using top-down approaches to gating, such as lithography and break junctions1, 3, 4, 5, 6, 7, 8, 9, 10, 11. But atomically precise control of the gate—which is crucial to transistor action at the smallest size scales—is not possible with these approaches. Here, we used individual charged atoms, manipulated by a scanning tunnelling microscope12, to create the electrical gates for a single-molecule transistor. This degree of control allowed us to tune the molecule into the regime of sequential single-electron tunnelling, albeit with a conductance gap more than one order of magnitude larger than observed previously8, 11, 13, 14. This unexpected behaviour arises from the existence of two different orientational conformations of the molecule, depending on its charge state. Our results show that strong coupling between these charge and conformational degrees of freedom leads to new behaviour beyond the established picture of single-electron transport in atomic-scale transistors.
'The plane of the future could well be a sleek and streamlined aircraft with a “blended wing” if proposals by the Delft University of Technology in Holland and Dutch carrier KLM come to fruition.'
Is This The Future Of Aviation? - KLM Blog
' ... AHEAD stands for Advanced Hybrid Engine Aircraft Development. AHEAD is a long-term aircraft design study led by the Delft University of Technology in the Netherlands along with a variety of academic and manufacturing partners throughout the world. KLM Engineering & Maintenance participated in this study and helped design the AHEAD Aircraft that can carry 300 passengers over a range of 14,000 kilometres. ... '
Do tell me if you have issues with my comments, I have no wish to offend.
- University of TwentePhysics: teaching & research, 1970 - 2001
- Leiden UniversityPhysical Chemistry, 1962 - 1970
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