formulasearchengine - User contributions [en]

Brjuno number

2014-05-13T23:37:41Z

83.202.135.57:

Taking on a home improvement project of any kind can be stressful and challenging if you are unprepared for that project. Getting helpful tips and information before you begin your project is going to make the process of improvements less of a challenge. Find useful tips by reading this article. Place candles throughout your house. Candles can create a wonderful effect in your home. The effect will be heightened if the candle is scented with a good fragrance. You can place candles in bedrooms, bathrooms, and dining areas. Bathrooms especially benefit from the use of scented candles. Scented candles will give your house a homey feel. When it comes to home improvement, be sure to keep in mind the age of your household members as well as health status. This is important if stairs are unmanageable or if there is a potential need for handicapped facilities in the bathrooms. Depending on the modifications, you may end up increasing the value of your home. You can stop any floor squeaks with construction adhesive. While this requires you to complete the work from a basement or crawlspace, the result is well worth your trouble. You will basically be gluing each floor joist to its neighbor by applying a glue line along each one with a caulking gun. If you are looking for a functional home improvement project, try "building up." Walls create a lot of wasted space. Add matching bookcases in your living room or build a window seat where your family can sit and read. [http://www.dailymail.co.uk/home/search.html?sel=site&searchPhrase=Simple+projects Simple projects] like these can make every space in your home usable and valuable to your family. If you have a small bathroom and not enough space to store your items, you can easily create some space yourself. Buy some wooden shelves and install them on your bathroom wall. Display your lotions, perfumes and other beauty items on the shelves as well as your smaller towels or toilet paper rolls. This will not only give your bathroom a decorative boost, it will also organize it. Throwing out an old sofa can be very tempting when it no longer looks new and clean. However, with the same effort it takes you to throw it out, you can buy some nice slipcovers and throw it on your sofa. Slipcovers are available in a myriad of designs and can spice up an old sofa very easily. When trying to fix up a house to flip it, pay attention to the kitchen. If has linoleum floors, replace them with tile. It makes the place look much better. You should examine the counters and look at replacing them. They don't have to be granite, but granite counter tops increase the value of the home and up your chances of selling it. Houses with good curb appeal often sell for considerably higher prices than other similar homes. Keep in mind, though, that the extra cost of the view may not be looked at as an investment, but as an extra charge for your pleasure. Some people like a view of the ocean, while other would prefer a nice view of the sunset each night. If you are doing a home improvement project that involves demolition, slow down and take your time. It may be exciting to smash that wall open, but you could damage structural supports, plumbing, or electrical connections. The same is true of pulling down cabinets and other fixtures. Once you've demolished it, it can't be put back, so pay attention to what you're doing. Create space in a cramped bathroom. Build floor-to-ceiling cabinets, and store similar items in baskets. This avoids any clutter on the countertop. A corner storage unit in your shower is perfect for holding shampoo, conditioner and any other items you may need. A great tip for creating space is to get rid of everything that isn't used on a regular basis. This can include out of date medications in your medicine cabinet or beauty products that you tried and didn't like. By clearing these out, you will have plenty of room for things that you actually use! Analyze your reasons for remodeling before you begin any project. If you are remodeling to increase the likelihood of a quick home sale, focus your efforts on the kitchen and bathroom. These two remodels typically have the highest return on investment. If you are remodeling solely for personal reasons, you can begin anywhere you like. You can use home improvement projects to allow your personality to shine through. Homeowners can do many things to their home on their own for a certain amount. In certain circumstances you will want to bring in the experts, and this article has offered you insight on knowing how best to proceed. If you liked this posting and you would like to receive extra information regarding commercial roofing perth - [https://www.rebelmouse.com/snobbishcuff2345/need-a-roof-look-no-further-th-775445702.html additional hints] - kindly pay a visit to our web site.

Odd–even sort

2014-02-23T15:09:43Z

83.202.173.51: Removed bad source comment that describes a buublesort while the source is of an Odd-Even sort

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Neural cryptography

2013-12-03T14:35:12Z

83.202.202.242: /* References */

{{Refimprove|date=March 2008}}

A definition in [[semiconductor physics]], '''carrier lifetime''' is defined as the average time it takes for a [[minority carrier]] to [[Carrier generation and recombination|recombine]]. The process through which this is done is typically known as '''minority carrier recombination'''.

The energy released due to [[Carrier generation and recombination|recombination]] can be either thermal, thereby heating up the semiconductor (''thermal recombination'' or [[non-radiative recombination]], one of the sources of [[waste heat]] in [[semiconductor]]s), or released as [[photon]]s (''optical recombination'', used in [[light-emitting diode|LEDs]] and [[semiconductor laser]]s).

Carrier lifetime plays an important role in [[Bipolar junction transistor|bipolar transistors]] and [[solar cells]].

In [[indirect band gap]] semiconductors, the carrier lifetime strongly depends on the concentration of recombination centers. Gold atoms act as highly efficient recombination centers, silicon for some high switching speed diodes and transistors is therefore alloyed with a small amount of gold. Many other atoms, e.g. iron or nickel, have similar effect.<ref>Alan Hastings - The Art of Analog Layout, 2nd ed (2005, ISBN 0131464108)</ref>

==Carrier lifetime in semiconductor lasers==
In semiconductor lasers, the carrier lifetime is the time it takes an electron before recombining via non-radiative processes in the laser cavity. In the frame of [[Laser diode rate equations|rate equations model]], carrier lifetime is used in the charge conservation equation as the time constant of the exponential decay of carriers.

The dependence of carrier lifetime on the carrier density is expressed as:<ref>L.A. Coldren and S.W. Corzine, "Diode Lasers and Photonic Integrated Circuits", Wiley Interscience, 1995</ref>

:<math>\frac{1}{\tau_n(N)}= A + BN + CN^2</math>

where A, B and C are the non-radiative, radiative and Auger recombination coefficients and <math>\tau_n(N)</math> is the carrier lifetime.

==References==
{{Reflist}}

==External links==
{{Portal|Electronics}}
* [http://www.iue.tuwien.ac.at/phd/park/node32.html Carrier Lifetime]

[[Category:Charge carriers]]