List of unsolved problems in physics: Difference between revisions

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'''Thermal history modelling''' is an exercise undertaken during [[basin modelling]] to evaluate the temperature history of stratigraphic layers in a [[sedimentary basin]].
 
The thermal history of a basin is usually calibrated using thermal indicator data, including [[vitrinite]] reflectance and [[fission track]]s in the [[mineral]]s [[apatite]] and [[zircon]].
 
The temperatures undergone by rocks in a sedimentary basin are crucial when attempting to evaluate the quantity, nature and volume of [[hydrocarbon]]s ([[fossil fuel]]s) produced by [[diagenesis]] of [[kerogen]]s (a group of chemicals formed from the decay of organic matter).
 
[[Jean Baptiste Joseph Fourier|Fourier's]] [[Fourier's Law|Law]] provides a simplified one-dimensional description of the variation in heat flow ''Q'' as a function of [[thermal conductivity]] ''k'' and thermal gradient ''dT''/''dz'':
 
:<math>Q=-k\frac{dT}{dz}</math>
 
(The minus sign indicates that heat flows in the opposite direction to increasing depth, that is, towards the Earth's surface.)
 
If the assumptions used to justify this simplified approximation (i.e. steady-state [[heat conduction]], no [[convection]] or [[advection]]) are accepted, we define the simple 1-dimensional heat diffusion equation where temperature ''T'' at a depth ''z'' and time ''t'' is given by the equation:
 
:<math>T_{z,t} = T_{t}^0 + Q_t \int_0^z\frac{dz'}{k_{z'}}</math>
where ''T''<sub>t</sub><sup>0</sup> is the surface temperature history, ''Q''<sub>''t''</sub> is the [[heat flow]] history and ''k'' is thermal conductivity. The integral thus represents the integrated thermal conductivity history of a 1-dimensional column of rock.
 
Thermal history modelling attempts to describe the temperature history ''T''<sub>z,t</sub> and therefore requires a knowledge of the burial history of the stratigraphic layers which is obtained through the process of [[back-stripping]].
 
==See also==
*[[Petroleum geology]]
 
{{DEFAULTSORT:Thermal History Modelling}}
[[Category:Petroleum geology]]
[[Category:Sedimentology]]

Latest revision as of 15:52, 30 December 2014

Do you understand where we stand when it comes to a weight? Are you obese, overweight, or even underweight? I've seen a lot of questions regarding this particular topic and hopefully this can aid clarify things.

This really is where the bmi chart is misleading. Recent studies have even shown a weak and inconsistent correlation between a excellent BMI and condition or early mortality.

A greater test is to bmi chart men stand parallel to a mirror, turn your head toward the mirror and see in the event you have a 'beer belly.' Or after we have showered and dried off, stand inside front of the bathroom mirror, and jump up and down.

Naturally, its not always black plus white. We learn that females tend to have a high percentage of body fat than men, whether or not they are the same fat plus height, and therefore have the same BMI. (Sorry, ladies.) Also, the elder we get, you tend to have more body fat than younger adults. And again, athletes and rather muscular persons like bodybuilders will likely not have an accurate BMI according to this method.

Obesity is regarded as the most hyped issues of today due to the growing amount of individuals with the condition and considering it will result various life-threatening conditions. An obese individual is more prone to diabetes, heart diseases, stroke, plus joint difficulties. Thus, preserving a healthy body weight is imperative.

21. Running Clothes/Bra: I like my running dresses sporty--not funky, yet this might be clearly bmi chart women personal preference. A advantageous running bra will go a extended way...avoid cotton at all cost. I have learned which running skirts are the most polarizing of all apparel goods. However, when you love wearing a skirt, pay a visit to the Skirtchaser Race Series...looks like fun!

Hydrostatic Weighing - This sort of weighing is also called as underwater weighing. In purchase to work this, a seat is placed on top of a scale inside an underwater environment. The scale is then zeroed out and once done, the individual is asked to sit found on the chair. The individual could full exhale and there is a have to bend down until the head is furthermore underwater. When the scale stabilizes, the reading is taken plus then employed to determine the body fat percentage.

You are able to choose some of the weight charts on this page. It won't take much time. Read about the body mass chart plus how you are able to employ it as a instrument for weight loss.

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