[904] | 1 | <!-- ******************************************************** --> |
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| 2 | <!-- Docbook Version: For Toolkit Developers Guide --> |
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| 3 | <!-- ******************************************************** --> |
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| 4 | |
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| 5 | <!-- ******************* Section (Level#1) ****************** --> |
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| 6 | <sect1 id="sect.DsgnFuncMateri"> |
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| 7 | <title> |
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| 8 | Materials |
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| 9 | </title> |
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| 10 | |
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| 11 | |
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| 12 | <!-- ******************* Section (Level#2) ****************** --> |
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| 13 | <sect2 id="sect.DsgnFuncMateri.DsgPhlsp"> |
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| 14 | <title> |
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| 15 | Design Philosophy |
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| 16 | </title> |
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| 17 | |
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| 18 | <para> |
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| 19 | The design of the materials category reflects what exists in nature: materials |
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| 20 | are made of a single element or a mixture of elements, and elements are made |
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| 21 | of a single isotope or a mixture of isotopes. Because the physical |
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| 22 | properties of materials can be described in a generic way by quantities which |
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| 23 | can be specified directly, such as density, or derived from the element |
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| 24 | composition, only concrete classes are necessary in this category. |
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| 25 | </para> |
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| 26 | |
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| 27 | <para> |
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| 28 | The material category implements the facilities necessary to describe the |
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| 29 | physical properties of materials for the simulation of particle-matter |
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| 30 | interactions. Characteristics like radiation and interaction length, |
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| 31 | excitation energy loss, coefficients in the Bethe-Bloch formula, shell |
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| 32 | correction factors, etc., are computed from the element, and if necessary, |
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| 33 | the isotope composition. |
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| 34 | </para> |
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| 35 | |
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| 36 | <para> |
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| 37 | The material category also implements facilities to describe surface |
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| 38 | properties used in the tracking of optical photons. |
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| 39 | </para> |
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| 40 | |
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| 41 | </sect2> |
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| 42 | |
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| 43 | <!-- ******************* Section (Level#2) ****************** --> |
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| 44 | <sect2 id="sect.DsgnFuncMateri.ClassDsg"> |
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| 45 | <title> |
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| 46 | Class Design |
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| 47 | </title> |
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| 48 | |
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| 49 | <para> |
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| 50 | The object-oriented design of the 'materials' related classes |
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| 51 | is shown in the class diagram: |
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| 52 | <xref linkend="fig.DsgnFuncMateri_1" />. |
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| 53 | The diagram is described in the Booch notation. |
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| 54 | |
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| 55 | <figure id="fig.DsgnFuncMateri_1"> |
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| 56 | <title> |
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| 57 | </title> |
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| 58 | <mediaobject> |
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| 59 | <imageobject role="fo"> |
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[921] | 60 | <imagedata fileref="./AllResources/OOAnalysisDesign/Materials/classDgmMaterials.jpg" |
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| 61 | format="JPG" contentwidth="10.0cm" align="center" /> |
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[904] | 62 | </imageobject> |
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| 63 | <imageobject role="html"> |
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[921] | 64 | <imagedata fileref="./AllResources/OOAnalysisDesign/Materials/classDgmMaterials.jpg" |
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[1208] | 65 | format="JPG" contentwidth="120%" align="center" /> |
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[904] | 66 | </imageobject> |
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| 67 | </mediaobject> |
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| 68 | </figure> |
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| 69 | </para> |
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| 70 | |
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| 71 | |
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| 72 | <!-- ******* Bridgehead ******* --> |
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| 73 | <bridgehead role="revisionHistory" renderas="sect4"> |
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| 74 | [Status of this chapter] |
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| 75 | </bridgehead> |
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| 76 | <para> |
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| 77 | <simplelist type="var"> |
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| 78 | <member> |
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| 79 | 27.06.05 section on design philosophy add (from Geant4 general paper) by |
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| 80 | D.H. Wright |
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| 81 | </member> |
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| 82 | <member> |
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| 83 | Dec. 2006 Conversion from latex to Docbook verson by K. Amako |
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| 84 | </member> |
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| 85 | </simplelist> |
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| 86 | </para> |
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| 87 | |
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| 88 | |
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| 89 | </sect2> |
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| 90 | </sect1> |
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| 91 | |
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| 92 | |
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