Virtual reality battlefield technology designed to train military leaders
A new and modern approach to understanding battlefield history may soon help prepare future military leaders in the U.S.
Dec 11, 2020
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A new and modern approach to understanding battlefield history may soon help prepare future military leaders in the U.S.
Dec 11, 2020
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A team of mechanical engineers at Beihang University, Peking University and the University of Houston has found that it is possible to capture small amounts of electricity by repeatedly squeezing treated luffa sponges. In ...
With the help of machine learning, ETH researchers have developed a novel yet low-cost tactile sensor. The sensor measures force distribution at high resolution and with great accuracy, enabling robot arms to grasp sensitive ...
Mar 16, 2020
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"Ineffective" methods of risk assessment and the processing of items for digital forensic analysis have led to police tensions and are slowing down investigations, a new study warns.
Jan 24, 2023
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Silently the eight propellers of the Hermes V8MT drone begin to spin and the large yellow aircraft rises up, locates its direction and moments later disappears into the sky in southern Poland.
Nov 28, 2019
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Future aerial design may owe a nod of thanks to five parrotlets flapping around in an instrumented flight chamber at Stanford University. They revealed that counter to conventional understanding of how animals and planes ...
Nov 25, 2019
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The Tin Man didn't have one. The Grinch's was three sizes too small. And for soft robots, the electronically powered pumps that function as their "hearts" are so bulky and rigid, they must be decoupled from the robot's body—a ...
Jul 14, 2022
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In recent years, scientists have introduced a wide variety of robots of all shapes and sizes. Among these are microswimmers, carefully engineered microstructures that can move in water and other liquids.
Organic photovoltaics are a third-generation solar cell technology made of electron donor and electron acceptor materials instead of conventional semiconductor p-n junctions. The performance of this alternative solar cell ...
Syringes and hollow needles have been used to deliver medication for more than a century. However, the precise implementation of these devices depends on the operator, and it can be difficult to deliver medication to delicate ...
Feb 25, 2019
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In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
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