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The six-factor formula is used in [[nuclear engineering]] to determine the multiplication of a [[nuclear chain reaction]] in a non-infinite medium. The formula is<ref name=Duderstadt>{{cite book |last=Duderstadt |first=James |coauthors=Hamilton, Louis |title=Nuclear Reactor Analysis |year=1976 |publisher=John Wiley & Sons, Inc |isbn=0-471-22363-8 }}</ref>
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th+a+simplistic+design.+The+job+of+the+knife+is+to+do+one+thing+and+do+it+well.+A+good+knife+is+engineered+to+be+the+best+at+what+it+does.+To+cut.%0D%0A%0D%0AMost+of+Wenger%27s+knives+are+in+the+Evolution+form%2C+which+is+designed+to+higher+match+the+human+hand+and+to+increase+security+when+utilizing+knives+in+quite+a+lot+of+conditions.+EvoGrip+adds+rubberization+to+the+Evolution+shape%2C+and+EvoWood+is+the+Evolution+form+carved+from+wooden.+Good+Housekeeping+%E2%80%98s+Analysis+Institute+was+impressed+by+an+analogous+model+as+effectively%2C+they+gave+it+a+strong+B+overall%2C+citing+an+uncomfortable+deal+with+as+its+important+detractor.+However+that%27s+most+likely+due+to+the+bizarre+concave+handle+in+the+model+they+examined.+The+current+iteration+has+a+plump+handle+that+is+not+only+comfortable%2C+but+also+super+grippy+because+of+its+textured+floor.+That+stated%2C+I+like+one-handed+opening+and+pocket+clips%2C+so+I+carry+a+Leatherman+Cost+TTi.&create=Create 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<center><math>k = \eta f p \epsilon P_{FNL} P_{TNL}</math></center>
 
{| class="wikitable" border="1" cellpadding="8" cellspacing="0"
! Symbol
! Name
! Meaning
! Formula
! Typical Thermal Reactor Value
|-
|<math>\eta</math>
| Thermal Fission Factor (Eta)
| The number of fission [[neutron]]s produced per absorption in the fuel.
| <math> \eta = \frac{\nu \sigma_f^F}{\sigma_a^F} </math>
| 1.65
|-
| <math>f</math>
| The thermal utilization factor
| Probability that a neutron that gets absorbed does so in the fuel material.
| <math>f = \frac{\Sigma_a^F}{\Sigma_a} </math>
| 0.71
|-
| <math>p</math>
| The resonance escape probability
| Fraction of fission neutrons that manage to slow down from fission to thermal energies without being absorbed.
| <math>p \approx \mathrm{exp} \left( -\frac{\sum\limits_{i=1}^{N} N_i I_{r,A,i}}{\left( \overline{\xi} \Sigma_p \right)_{mod}} \right)</math>
| 0.87
|-
| <math>\epsilon</math>
| The fast fission factor (Epsilon)
| <center><math>\tfrac{\mbox{total number of fission neutrons}}{\mbox{number of fission neutrons from just thermal fissions}}</math></center>
| <math>\epsilon \approx 1 + \frac{1-p}{p}\frac{u_f \nu_f P_{FAF}}{f \nu_t P_{TAF} P_{TNL}}</math>
| 1.02
|-|
|-
| <math>P_{FNL}</math>
| The fast non-leakage probability
| The probability that a [[fast neutron]] will not leak out of the system.
| <math>P_{FNL} \approx \mathrm{exp} \left( -{B_g}^2 \tau_{th} \right)</math>
| 0.97
|-|
|-
| <math>P_{TNL}</math>
| The thermal non-leakage probability
| The probability that a [[thermal neutron]] will not leak out of the system.
| <math>P_{TNL} \approx \frac{1}{1+{L_{th}}^2 {B_g}^2}</math>
| 0.99
|-
|}
 
The symbols are defined as:<ref name=Adams>{{cite book |last=Adams |first=Marvin L. |title=Introduction to Nuclear Reactor Theory |year=2009 |publisher=Texas A&M University}}</ref>
*<math>\nu</math>, <math>\nu_f</math> and <math>\nu_t</math> are the average number of neutrons produced per fission in the medium (2.43 for [[Uranium-235]]).
*<math>\sigma_f^F</math> and <math>\sigma_a^F</math> are the microscopic fission and absorption cross sections for fuel, respectively.
*<math>\Sigma_a^F</math> and <math>\Sigma_a</math> are the macroscopic absorption cross sections in fuel and in total, respectively.
*<math>N_i</math> is the number density of atoms of a specific [[nuclide]].
*<math>I_{r,A,i}</math> is the resonance integral for absorption of a specific [[nuclide]].
**<math>I_{r,A,i} = \int_{E_{th}}^{E_0} dE' \frac{\Sigma_p^{mod}}{\Sigma_t(E')} \frac{\sigma_a^i(E')}{E'}</math>.
*<math>\overline{\xi}</math> (often referred to as ''worm-bar'' or ''squigma-bar'') is the average lethargy gain per scattering event.
**Lethargy is defined as decrease in neutron energy.
*<math>u_f</math> (fast utilization) is the probability that a fast neutron is absorbed in fuel.
*<math>P_{FAF}</math> is the probability that a fast neutron absorption in fuel causes fission.
*<math>P_{TAF}</math> is the probability that a thermal neutron absorption in fuel causes fission.
*<math>{B_g}^2</math> is the [[Geometric and Material Buckling|geometric buckling]].
*<math>{L_{th}}^2</math> is the diffusion length of thermal neutrons.
**<math>{L_{th}}^2 = \frac{D}{\Sigma_{a,th}}</math>.
*<math>\tau_{th}</math> is the age to thermal.
**<math>\tau = \int_{E_{th}}^{E'} dE'' \frac{1}{E''} \frac{D(E'')}{\overline{\xi} \left[ D(E'') {B_g}^2 + \Sigma_t(E') \right]}</math>.
**<math>\tau_{th}</math> is the evaluation of <math>\tau</math> where <math>E'</math> is the energy of the neutron at birth.
 
==Multiplication==
The multiplication factor, k, is defined as (see [[Nuclear chain reaction]]): <center><math>k = \frac{\mbox{number of neutrons in one generation}}{\mbox{number of neutrons in preceding generation}}</math></center>
 
If k is greater than 1, the chain reaction is ''supercritical,'' and the neutron population will grow exponentially. <br />
If k is less than 1, the chain reaction is ''subcritical,'' and the neutron population will exponentially decay. <br />
If k = 1, the chain reaction is ''critical'' and the neutron population will remain constant.
 
==See also==
* [[Critical mass]]
* [[Nuclear chain reaction]]
* [[Nuclear reactor]]
* [[Four factor formula]]
 
==References==
{{reflist}}
 
[[Category:Nuclear technology]]
[[Category:Radioactivity]]

Latest revision as of 17:18, 10 April 2014

The most common lock mounted in all conventional pocket knives is the one that gives manner when stress is applied on the blade. Springs are fitted within the pivot to withstand stress that's generated when the knife is used. To shut the blade, all you have knife sales to do is press the unsharpened aspect of the blade and the blade will come free and fold into the deal with. That is good enough for most people who make use of such knives Nevertheless, as time goes by, the energy of the spring weakens and the knife closes even when the individual does not need it to.

Most of the time, conventional looking knives are normally made out of chrome steel, which typically lasts you lifetime. The 2 greatest and hottest are folding searching knives and fixed blade. A fixed Blade looking knife is much stronger and extra immovable than the folding knife , and comes with a nylon protect to maintain the blade protected. When making an attempt to decide which conventional searching knives to select from, you will need to go to the shop and find out which one feels the very best in your hand. Also, this is especially vital when you plan making your purchase on the Internet.

This can be a well made knife in each respect. I am fairly abusive toward my equipment and the Native is so nice, it is hard to justify abusing it. So what I do is carry it when I do know I'll have a simple day, like on the weekends. The pinned construction does make me a little bit nervous, however I personal different American instruments that do this just like the Leatherman Juice. I want they might put screws on it, however I belief Spyderco, and neither firm has given me a cause to not belief their USA made products.

I like how the towel appears to be like. The graphics and his identify are shiny, colourful and nicely performed. My solely complaint could be that the towel is very thin. I'd personally need one thing somewhat thicker for breezy Maine beaches. Ryan loves the picture of Ironman, his title and says its a mushy towel. He actually victorinox swiss army super tinker pocket knife likes it. Like most experts, consumers merely can not perceive why Ka-Bar allowed a poor-high quality sheath to come back with the knife (The sheath is made in China in case you’re curious.). The writer, nonetheless, surmises that Ka-Bar put the whole lot into the knife itself. Replacing the horrible sheath just isn't really an issue. General Rating

Should you be apathetic to finding your good EDC knife, I will go away you with this glorious, common measurement, basic objective knife that fits the EDC necessities completely. My EDC. (besides mine doesn't have sarrations, purchase yours with sarrations) You should have no problem ordering one, do you have to live nowhere near a knife shop. In reality I struggle to search out the difference between a great rendition of 8Cr13MoV and AUS-8, aside from the nation of origin. Breaking the edge down completely, and I mean utterly, this factor was dull, and bringing it again has confirmed that 8Cr13MoV will not be the garbage that many, including myself, had thought.

The Smith & Wesson CKTACBSD Tactical knife is made in China and says so on the field, but I did not really mind as a result of nearly the whole lot that is made out of plastic or is beneath $10 is made in China these days, but regardless I still discovered this knife to be nicely built for such a low worth. Victorinox Swiss Military Basic SD Pocket Knife (Blue), good sale Dehumidifiers You can buy Victorinox Swiss Military Traditional SD Pocket Knife (Blue) see full Evaluation. We predict you find Low-cost Value and as we speak Shops Purchase On-line shipping options obtainable and additional data by way of click on the hyperlink beneath – Safe Check out. Avaliable at Amazon.com

Concerning the edge of the blade, there are serrated and non-serrated, also known as plain edge. I usually suggest plain edge to virtually everyone, however serrated knives do have a couple of special functions. If you're cutting giant quantities of fibrous materials, resembling rope, serrated knife may make the very best pocket knife for you. For all the things else, keep on with the non-serrated. Regarding partially serrated blades, I find that these have a tendency to not have enough plain edge or serrated edge to be particularly helpful in doing tasks designed for either. The blade is a very sensible drop level design which has a convex curve from the again towards the purpose.

The Higonokami Japanese pocket knife has been around for over a century. Thought-about by some to be a residing fossil, it has remained virtually completely unchanged since initially made in 1896. The Higonokami has no locking mechanism, as an alternative it relies upon the friction of the swivel and the strain of the consumer’s hand to stop it from folding throughout use. Despite these criticisms, I feel this is a much improved model of Gerber's finest selling knife, and one which followers of the unique model will definitely enjoy. In truth, this would possibly even be a knife that critics, who panned the original version, would possibly finally think about a critical, area-worthy survival blade.