Many changes about notations

- nano-hexapod => active platform
- use "\text{}" for all units

figs/inkscape/rotating_nass_model.svg

@@ -2,12 +2,12 @@
 <!-- Created with Inkscape (http://www.inkscape.org/) -->
 
 <svg
-   width="111.06322mm"
+   width="119.357mm"
    height="55.626705mm"
-   viewBox="0 0 111.06322 55.626707"
+   viewBox="0 0 119.35701 55.626707"
    version="1.1"
    id="svg2597"
-   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25, custom)"
+   inkscape:version="1.4.1 (93de688d07, 2025-03-30)"
    sodipodi:docname="rotating_nass_model.svg"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
@@ -26,12 +26,12 @@
      inkscape:document-units="mm"
      showgrid="false"
      inkscape:zoom="2.3786088"
-     inkscape:cx="208.10484"
-     inkscape:cy="88.707316"
-     inkscape:window-width="1920"
-     inkscape:window-height="1200"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
+     inkscape:cx="225.1316"
+     inkscape:cy="88.707315"
+     inkscape:window-width="2534"
+     inkscape:window-height="1367"
+     inkscape:window-x="11"
+     inkscape:window-y="60"
      inkscape:window-maximized="1"
      inkscape:current-layer="layer1" />
   <defs
@@ -193,7 +193,7 @@
      inkscape:label="Layer 1"
      inkscape:groupmode="layer"
      id="layer1"
-     transform="translate(-145.98789,25.978399)">
+     transform="translate(-145.9879,25.978399)">
     <image
        width="54.30558"
        height="55.626705"
@@ -213,7 +213,7 @@
          id="tspan241"
          x="233.32686"
          y="-6.8292742"
-         style="font-size:3.52777px;stroke-width:0.264583">Micro-Hexapod</tspan></text>
+         style="font-size:3.52777px;stroke-width:0.264583">Positioning-Hexapod</tspan></text>
     <text
        xml:space="preserve"
        style="font-size:3.52777px;line-height:1.25;font-family:'Latin Modern Roman';-inkscape-font-specification:'Latin Modern Roman, ';stroke-width:0.264583"
@@ -224,7 +224,7 @@
          id="tspan241-6"
          x="233.34099"
          y="-16.449074"
-         style="font-size:3.52777px;stroke-width:0.264583">Nano-Hexapod</tspan></text>
+         style="font-size:3.52777px;stroke-width:0.264583">Active Platform</tspan></text>
     <text
        xml:space="preserve"
        style="font-size:3.52777px;line-height:1.25;font-family:'Latin Modern Roman';-inkscape-font-specification:'Latin Modern Roman, ';stroke-width:0.264583"