eVa's dragonfly Low-pass filter An optical filter can correctly be called a low-pass filter, but conventionally is called a longpass filter (low frequency is long wavelength), to avoid confusion. Examples Acoustics A stiff physical barrier tends to reflect higher sound frequencies, and so acts as a low-pass filter for transmitting sound. When music is playing in another room, the low notes are easily heard, while the high notes are attenuated. Electronics In an electronic low-pass RC filter for voltage signals, high frequencies in the input signal are attenuated, but the filter has little attenuation below the cutoff frequency determined by its RC time constant. Electronic low-pass filters are used on inputs to subwoofers and other types of loudspeakers, to block high pitches that they can't efficiently reproduce. Telephone lines fitted with DSL splitters use low-pass and high-pass filters to separate DSL and POTS signals sharing the same pair of wires. Ideal and real filters RC filter
`▲´ Damian Marley - It was written Capacitance Capacitance is the ability of a body to store an electrical charge. Any object that can be electrically charged exhibits capacitance. A common form of energy storage device is a parallel-plate capacitor. In a parallel plate capacitor, capacitance is directly proportional to the surface area of the conductor plates and inversely proportional to the separation distance between the plates. If the charges on the plates are +q and −q respectively, and V gives the voltage between the plates, then the capacitance C is given by which gives the voltage/current relationship The capacitance is a function only of the geometry (including their distance) of the conductors and the permittivity of the dielectric. The SI unit of capacitance is the farad (symbol: F), named after the English physicist Michael Faraday. The energy (measured in joules) stored in a capacitor is equal to the work done to charge it. The energy stored in a capacitor is found by integrating this equation. Capacitors where
Portraits of Happy Centenarians by Karsten Thormaehlen “Happy at One Hundred”, a nice series of portraits of centenarians by the German photographer Karsten Thormaehlen… Karsten Thormaehlen “Happy at One Hundred“, une superbe série de portraits de centenaires réalisée par le photographe allemand Karsten Thormaehlen… symlinker - Symbolic Link Creator. GUI for mklink, Microsoft Windows symlink utility With this utility you can use the symlink application Microsoft Windows has well hidden inside the cmd.exe app. The goal is just make it easier to create symbolic links, hard links, or directory junctions, using a pretty simple interface, so no more bogus command line to do it... This application needs .Net Framework 3.5 to run (SP1 recommended) and as of 7/26/2010 this software will only work under Windows Vista or 7, Windows XP doesn't have the mklink command inside the cmd.exe app. If you encounter a bug, please let me know, I will look into it when I have the time, I have a really tight schedule right now... Thanks for your downloads and support, hope you like it! New Version 188.8.131.52 10/30/2010 Fixed. Version 184.108.40.206 7/26/2010 Fixed. Version 220.127.116.11 3/20/2010 Fixed. Version 18.104.22.168 2/6/2010 Fixed. Version 22.214.171.124 2/3/2010 Added.
9-Year-Old Girl Builds Shelters For The Homeless And Grows Food For Them, Too Though Hailey Fort is only 9 years old, she has already done more to help the homeless and needy than many of us have. This young girl spends her free time building mobile shelters for the homeless, and even grows food and provides toiletries for them, too! When Fort was 5 years old, she asked her mother, Miranda, about helping a homeless man she saw in Bremerton, Washington, where she lives. This year, Fort’s goal is to grow 250lbs (113kg) of food, build 12 shelters, and delivers thousands of toiletries and hygienic items. More info: Facebook | Amazon | Gofundme (h/t: king5, abc) When Hailey was 5, she saw a homeless man and asked her mom whether she could help him by buying a sandwich Since then, this 9-year-old has been building mobile shelters to help her homeless friends “It just doesn’t seem right that there are homeless people. Thanks to discounts, each shelter costs only about $300 to build She gets some help and guidance from her parents but does much of the construction herself
Make Windows 7, 8 and Vista 32-bit (x86) Support More Than 4GB Memory As you’ll know, there has been 2 versions of each Windows starting from XP which are 32-bit and 64-bit editions. Sometimes a Windows 32-bit is referred as x86 and 64-bit as x64. We won’t go into details on what are the differences between x86 and x64 are, but one of the major differences is a 64-bit Windows can support more than 4GB of RAM. If your computer has 4GB of RAM and you’re using a 32-bit Windows, you’ll notice that only about 3GB – 3.5GB is being recognized and the remaining memory is gone. Weirdly, Windows 2003 and 2008 can already address more than 4 GB of memory so why can’t we do that with Vista and newer operating systems? The answer is: Microsoft doesn’t want that and it’s all just a licensing matter. We can of course go for a 64-bit version of Windows, but even today, there is still quite a lot of software which cannot run properly on x64, which can be inconvenient if you’re someone like us who installs and tests a lot of software. 1. 2. cd C:\Windows\system32 3. 4. 5.
Manifold Destiny On the evening of June 20th, several hundred physicists, including a Nobel laureate, assembled in an auditorium at the Friendship Hotel in Beijing for a lecture by the Chinese mathematician Shing-Tung Yau. In the late nineteen-seventies, when Yau was in his twenties, he had made a series of breakthroughs that helped launch the string-theory revolution in physics and earned him, in addition to a Fields Medal—the most coveted award in mathematics—a reputation in both disciplines as a thinker of unrivalled technical power. Yau had since become a professor of mathematics at Harvard and the director of mathematics institutes in Beijing and Hong Kong, dividing his time between the United States and China. His lecture at the Friendship Hotel was part of an international conference on string theory, which he had organized with the support of the Chinese government, in part to promote the country’s recent advances in theoretical physics. Grigory Perelman is indeed reclusive. E.
Price elasticity of demand Price elasticities are almost always negative, although analysts tend to ignore the sign even though this can lead to ambiguity. Only goods which do not conform to the law of demand, such as Veblen and Giffen goods, have a positive PED. In general, the demand for a good is said to be inelastic (or relatively inelastic) when the PED is less than one (in absolute value): that is, changes in price have a relatively small effect on the quantity of the good demanded. Definition It is a measure of responsiveness of the quantity of a raw good or service demanded to changes in its price. The formula for the coefficient of price elasticity of demand for a good is: As the difference between the two prices or quantities increases, the accuracy of the PED given by the formula above decreases for a combination of two reasons. Two alternative elasticity measures avoid or minimise these shortcomings of the basic elasticity formula: point-price elasticity and arc elasticity. . is