Cottontails and jackrabbits can be adorable but knowing how to keep rabbits out of your garden can eliminate the destruction they can cause. They eat up the landscape, food crops, and can cause damage to trees, shrubs, and potentially wires and furniture thanks to their gnawing habits. The ...
The concept of the black box generally refers to a device or system where its internal workings are not visible to the user or observer, and the focus is on understanding its input and output. In various contexts, such as aviation or technology, a black box can also specifically refer to ...
Ultrasonic sound waves (too high pitched for humans to hear) are generated at the edges of the screen and reflected back and forth across its surface. When you touch the screen, you interrupt the sound beams and absorb some of their energy. The screen's microchip controller figures out from...
The recording shows the time it takes for the nerve to conduct the electrical impulse across the distance. By dividing the distance by time, the physician (or the machine) calculates the conduction velocity. The test is often performed when a conduction block or demyelinating disease (like ...
Because of its rapid ability to block the clotting cascade, heparin is usually used for 5–10 days in the acute stage of venous thrombosis to reduce expansion of the thrombus and prevent pulmonary embolism.349,350 It may also be prescribed for long-term use in cancer-related thrombosis.349 ...
When backing the car, the parking sensor uses the principle of ultrasonic waves. The ultrasonic sensor installed on the rear bumper sends ultrasonic waves to the obstacle and reflects the sound wave, calculates the actual distance between the car body and the obstacle, and then prompts the driver...
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While the sound is amplified at the focus, the user cannot simply place his ear there as the rest of his head would block the sound waves. Instead, a parabolic microphone places a small audio receiver at the focus by attaching it to the end of a long plastic arm. The audio receiver co...
Attempting to block one of these blasts with a shield would probably not work. Because the blasts have a fairly solid base, they will plow through obstacles until hitting something hard enough. This is seen in "Alvin and the Outcasts" when the dragons attack the Outcasts, and it also ...
If a bat needs to be located, the central controller sends the bat’s ID over a radio link to the bat. The bat will detect its ID and send out an ultrasonic pulse. The central controller measures the time it took for that pulse to reach the receiver. Since the speed of sound through...