Square Wave

Square wave

A square wave is a non-sinusoidal periodic waveform in which the amplitude alternates at a steady frequency between fixed minimum and maximum values, with the same duration at minimum and maximum. In an ideal square wave, the transitions between minimum and maximum are instantaneous. The square wave is a special case of a pulse wave which allows arbitrary durations at minimum and maximum. The ratio of the high period to the total period of a pulse wave is called the duty cycle. A true square wave has a 50% duty cycle (equal high and low periods). Square waves are often encountered in electronics and signal processing, particularly digital electronics and digital signal processing. Its stochastic counterpart is a two-state trajectory.

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Seventh wave

In many parts of the world, local folklore predicts that out of a certain number of waves, one will be much larger than the rest. "Every seventh wave" or "every ninth wave" are examples of such common beliefs that have wide circulation and have entered popular culture through music, literature, and art. These ideas have some scientific merit, due to the occurrence of wave groups at sea, but there is no explicit evidence for this specific phenomenon, or that these wave groups are related to sneaker waves. The saying is likely derived more from a cultural fascination with certain numbers, and it may also be designed to educate shore-dwellers about the necessity of remaining vigilant when near the ocean

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Medium wave (AM) and short wave radio stations

The following medium wave and short wave radio stations can also be heard in Pretoria. Some stations will be clearer at night. Short wave frequencies vary according to time of day.za. MEDIUM WAVE (AM) 576 kHz - SABC Metro FM (Meyerton, Gauteng) 657 kHz - Radio Pulpit (Meyerton, Gauteng) 909 kHz - Voice of America (Moepeng Hill, Botswana) 1197 kHz - Family Radio (Lancers Gap, Maseru, Lesotho) 1440 kHz - Radio Pulpit (Kameeldrif) - DRM test transmissions started in 2014SHORT WAVE (all at Meyerton, Gauteng) BBC World Service SABC Channel Africa SA Radio League Trans World Radio Family Radio

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Wave energy converter operation

The operating principle of the Ocean Grazer wave energy converter is to store potential energy by creating a hydraulic head, due to the differences in pressure between two reservoirs. All three concepts rely on this principle to function. The hydraulic head is created by circulating internal fluid from the lower to the upper reservoir via a novel hydro-mechanical power take off system, composed of distributed and coupled floaters. Each floater is linked to a separate multi-piston pumping system, consisting of differently sized pistons that regulate the amount of pumped fluid and that can be adapted to the surface wave conditions. Check valve systems are needed to minimize the back flow when the pistons return to their resting position. Lastly, similar to a hydroelectric plant, once enough fluid has been stored in the upper reservoir it can be circulated through a turbine system to generate electrical energy.

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how to get soft curls like this?

That is more like a wave.than a curl.if your hair is bone straight you may need a large barrel curling iron.just run it threw and it should work just fine

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Edge wave

In fluid dynamics, an edge wave is a surface gravity wave fixed by refraction against a rigid boundary, often a shoaling beach. Progressive edge waves travel along this boundary, varying sinusoidally along it and diminishing exponentially in the offshore direction.

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Wholesome Wave

Wholesome Wave was founded in 2007 by Nischan, along with friends Michael Batterberry, and Gus Schumacher as founding Board Chair. It was founded with funding from Newman's Own Foundation and the Betsy and Jesse Fink Foundation, and supported in part by funding from Grow for Good, a philanthropic initiative of FOOD & WINE Magazine. The mission of Wholesome Wave is to empower underserved Americans to make healthier food choices by providing affordable access to fruits and vegetables at farmers markets and grocery retailers. Until Dressing Room closed in 2014, Wholesome Wave and Dressing Room worked in tandem to create grassroots initiatives that celebrate local food systems, affordable food access in urban and rural communities struggling with poverty, and heritage recipe restoration.

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gravitational wave detection using interferometer detectors

I hope the following makes sense to you.Gravity waves are thought to distort spacetime , but trying to get a mental picture of it will make you go well, mental.So difficult as it may be, try to stop thinking of a 4 D space, it wo not work, for you, me or anybody.We can only imagine 3 D space, but we can (fairly!) easily calculate the distortion due to gravity on spacetime using math. Imagine the waves on water making the surface of the ocean distort periodically. Now you want to measure a certain length, it will differ, roughly speaking, depending on whether a wave is passing by at the time of measurement or not. Now extend that idea to spacetime being distorted so that our measurement of it, using light waves, also changes with time, as the gravity waves pass by. So if the light rays are out of phase, because one of them travels a different distance compared to the other, this will show up in the interference pattern of the interferometer.You can see from the picture below how the arms of the LIGO detector are set at 90 degrees apart, to maximise our chances of detecting the distortion, as the math , not just our mental pictures, tells us this is the best way to line them up for possible detection of gravity waves