Fractional coordinates: Difference between revisions

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Small fixes. Previous edit seems correct to me, using ref. 4 with V = abcv (v as defined here, V as defined in the ref.)
 
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A '''leak noise correlator''' is an electronic device used for [[Leak Detection]] and as a [[leak locator]] to find leaks in pressurized water or gas lines.  
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Typically, microphones or acoustic sound sensors are placed in contact with the pipe, at two or more points, to record the sound emitted by a leak (e.g. a hissing noise) somewhere between the points. The sound data is processed through a mathematical [[algorithm]] which compares or [[Correlation|correlates]] the two recordings to determine the difference in the times it takes noise to travel from the site of the leak to each of the sensors. If the distance between the sensors is known in advance, this timing information can be used to determine the location of the leak.,<ref>http://flowmetrix.com/pri_digi.htm</ref><ref>http://echologics.com/products/leakfinderrt</ref>
 
The cross correlation signal of one continuous function, f, with another, g, is defined as:
 
:<math>(f \star g)(t)\ \stackrel{\mathrm{def}}{=} \int_{-\infty}^{\infty} f^*(\tau)\ g(t+\tau)\,d\tau,</math>
 
where f * denotes the complex conjugate of f.
 
If f and g are two sound recordings of the noise produced by the leak, delayed in time by a different unknown amount, the time delay can be found by determining the time offset for which the cross correlation product has a maximum value.  This approach should be accurate so long as the sound of the leak received at each sensor is sufficiently similar over a period of time.
 
Leak correlators require accurate information about the materials through which the leak sound is traveling in order to perform an accurate time calculation. The user normally has to input the size and type of pipe as well as the distances of the loggers from each other. Many standard pipe sizes have known speeds of sound which can be used for the calculation. If the materials are unknown, the speed of sound through the materials will have to be calculated on site to get an accurate leak correlation.  
 
Most correlators can also analyze the sound levels and sound frequencies to determine other information about the leak such as the size and severity of the leak or whether it's on the pipe, a valve or hydrant, or in a service line.
 
Most leak correlators serve two major purposes. First to detect the presence of a leak, second to pinpoint the location of the leak for repair when detected.
 
==See also==
{{Portal|Water}}
* [[Domestic water system]]
* [[Water]]
** [[Water pipes]]
** [[Water supply]]
* [[Leak]]
* [[Pipe (material)]]
* [[Water pipe]]
* [[Leak Detection]]
 
==Notes and references==
{{Reflist}}
 
[[Category:Water industry]]
[[Category:Water supply infrastructure]]

Latest revision as of 14:09, 16 July 2014

It involves expertise and knowledge of various tools and technologies used for creating websites. It is thus, on these grounds that compel various web service provider companies to integrate the same in their packages too. Should you go with simple HTML or use a platform like Wordpress. In the recent years, there has been a notable rise in the number of companies hiring Indian Word - Press developers. The number of options offered here is overwhelming, but once I took the time to begin to review the video training, I was amazed at how easy it was to create a squeeze page and a membership site.

Most Word - Press web developers can provide quality CMS website solutions and they price their services at reasonable rates. WPTouch is among the more well known Word - Press smartphone plugins which is currently in use by thousands of users. This plugin allows a blogger get more Facebook fans on the related fan page. Apart from these, you are also required to give some backlinks on other sites as well. But in case you want some theme or plugin in sync with your business needs, it is advisable that you must seek some professional help.

But before choosing any one of these, let's compare between the two. s cutthroat competition prevailing in the online space won. all the necessary planning and steps of conversion is carried out in this phase, such as splitting, slicing, CSS code, adding images, header footer etc. Provide the best and updated information to the web searchers and make use of these wonderful free themes and create beautiful websites. If you have any questions on starting a Word - Press food blog or any blog for that matter, please post them below and I will try to answer them.

The disadvantage is it requires a considerable amount of time to set every thing up. For those who have virtually any issues about in which along with tips on how to employ wordpress dropbox backup, you can contact us with our website. Quttera - Quttera describes itself as a 'Saa - S [Software as a Service] web-malware monitoring and alerting solution for websites of any size and complexity. Thus it is difficult to outrank any one of these because of their different usages. If you choose a blog then people will be able to post articles on your site and people will be able to make comments on your posts (unless you turn comments off). Look for experience: When you are searching for a Word - Press developer you should always look at their experience level.

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