scholarly journals The application of the method of dimensional analysis in the wood sciences

2016 ◽  
Vol 64 (2) ◽  
pp. 46
Author(s):  
Zoltán KOCSIS
Keyword(s):  
Dimensional Analysis

<p class="p1">A kutatások során gyakran előforduló probléma a viszonylag nagyszámú független változó kezelése, valamint az adatok általános érvényű feldolgozása. A nagyszámú független változó számának redukálásához és a kísérleti adatok általános érvényű feldolgozásához nagy segítséget nyújt a hasonlósági elmélet dimenziónélküli számok segítségével. Jelen publikáció ennek alkalmazását kívánja bemutatni egy kidolgozott példán keresztül. A dimenzióanalízis módszerét az elmúlt 100 évben már sikeresen alkalmazták például hőtani, mechanikai és áramlástani problémák megoldásánál főként azokban az esetekben, amikor a jelenséget részleteiben nem ismerték és emiatt nem tudták a pontos matematikai modelljét, például differenciálegyenletét felírni. A szerző célul tűzte ki, hogy ez a gyakorlatias módszer a tudományos életben, így a faipari tudományokban is minél szélesebb körben megismerésre kerüljön.</p>

In situ investigation of the primary recrystallization of alpha titanium in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 634-635
Author(s):  
S. Naka ◽  
R. Penelle ◽  
R. Valle
Keyword(s):  
Dimensional Analysis ◽  
Texture Evolution ◽  
Cold Work ◽  
Three Dimensional ◽  
Primary Recrystallization ◽  
Thin Foils ◽  
In Situ Investigation ◽  
Grain Growth Model ◽  
Alpha Titanium

The in situ experimentation technique in HVEM seems to be particularly suitable to clarify the processes involved in recrystallization. The material under investigation was unidirectionally cold-rolled titanium of commercial purity. The problem was approached in two different ways. The three-dimensional analysis of textures was used to describe the texture evolution during the primary recrystallization. Observations of bulk-annealed specimens or thin foils annealed in the microscope were also made in order to provide information concerning the mechanisms involved in the formation of new grains. In contrast to the already published work on titanium, this investigation takes into consideration different values of the cold-work ratio, the temperature and the annealing time.Two different models are commonly used to explain the recrystallization textures i.e. the selective grain growth model (Beck) or the oriented nucleation model (Burgers). The three-dimensional analysis of both the rolling and recrystallization textures was performed to identify the mechanismsl involved in the recrystallization of titanium.

Dimensional Analysis of Protective Factors and Suicidality Among Combat Vietnam Veterans

2009 ◽  
Author(s):  
Rumi Price ◽  
Gregory Widner ◽  
William True ◽  
Monica Matthieu
Keyword(s):  
Protective Factors ◽  
Dimensional Analysis ◽  
Vietnam Veterans

A Master Class in Dimensional Analysis: the Universal Gas Constant

2018 ◽  
Author(s):  
john andraos
Keyword(s):  
Physical Chemistry ◽  
High School ◽  
General Chemistry ◽  
Dimensional Analysis ◽  
Undergraduate Students ◽  
Microsoft Excel ◽  
Energy Unit ◽  
Spreadsheet Program ◽  
Volume Unit

We present a spreadsheet-assisted exercise using Microsoft Excel software for the<br>determination of the universal gas constant, R, in 35,712 different units. This large<br>number of units arises from a simple enumeration of possible pressure-volume unit<br>combinations and energy unit combinations covering SI (metric), Imperial (British), and<br>American units. In turn, various units for force and area used for defining pressure, and<br>various units for force and distance used for defining energy are explored. This<br>presentation serves as an excellent exercise for high school and undergraduate students to<br>master the skill of dimensional analysis, unit conversions, and basic combinatorics in<br>general chemistry and physical chemistry courses. Instructors can also use the described<br>exercise of constructing conversion matrices to train students in how to efficiently use the<br>Microsoft Excel spreadsheet program.

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