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2. This Common Water Problem Might Be Making Your Home Dirtier - AOL

   www.aol.com/common-water-problem-might-making...

   To remove hard water stains in toilet bowls and sinks, look for products that contain acids and oxides that will remove the mineral buildup. Use a clarifying shampoo and deep conditioning ...

3. Mains hum - Wikipedia

   en.wikipedia.org/wiki/Mains_hum

   Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz , i.e., 100/120 Hz, depending on the local power-line frequency .

4. Electromagnetically induced acoustic noise - Wikipedia

   en.wikipedia.org/wiki/Electromagnetically...

   resistors: the braking resistors of electric trains, used to dissipate electrical power when the catenary is not receptive during braking, can make electromagnetically induced acoustic noise; coils: in magnetic resonance imaging, "coil noise" is that part of total system noise attributed to the receiving coil, due to its non-zero temperature.

5. Excess noise ratio - Wikipedia

   en.wikipedia.org/wiki/Excess_Noise_Ratio

   Noise figure measurements can be made with a noise diode, a power supply for the noise diode, and a spectrum analyser. They can also be made with a specialist noise figure meter. The advantage of the noise figure meter is that it will automatically switch the noise diode on and off, giving a continuous reading of Y; it will also have the ...

6. Power supply - Wikipedia

   en.wikipedia.org/wiki/Power_supply

   A simple general-purpose desktop power supply used in electronic labs, with power output connector seen at lower-left and power input connector (not shown) located at the rear Interior of high-end linear power supply with toroidal mains transformer. A power supply is an electrical device that supplies electric power to an electrical load.

7. Backflow - Wikipedia

   en.wikipedia.org/wiki/Backflow

   It can be a serious health risk for the contamination of potable water supplies with foul water. In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl. For this reason, building codes mandate a series of measures and backflow prevention devices to prevent backflow.

8. Noise generator - Wikipedia

   en.wikipedia.org/wiki/Noise_generator

   The result is a wide-bandwidth high-power source. Conventional diodes can be used in breakdown. The avalanche breakdown also has multistate noise. The noise output power randomly switches among several output levels. Multistate noise looks somewhat like flicker ( ) noise. The effect is process dependent, but it can be minimized.

9. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!