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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Dear Soren, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>We formulated at p. 591 of: Loet Leydesdorff, Stephen Carley, and Ismael Rafols, <a href="http://arxiv.org/ftp/arxiv/papers/1202/1202.1914.pdf">Global Maps of Science based on the new Web-of-Science Categories, </a><i>Scientometrics</i> 94(2) (2013) 589-593; <<a href="http://link.springer.com/article/10.1007%2Fs11192-012-0784-8">open access</a>> [<a href="http://www.leydesdorff.net/overlaytoolkit/">software</a>], as follows: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'>“The organization into these four groups (biomedical, physical, environmental, and social sciences) is now provided as another (optional) partition within the Pajek (.paj) file containing the base map, and is also made available as input to VOSviewer.”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The partitioning into four and six domains was generated by my co-authors. I prefer to use the 19 disciplines on the basis of factor analysis of the matrix. However, one can ask for a four-factor solution, and then one is free to designate the factors.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In the figure below, I overlaid Pedro’s 23 publications included in WoS in terms of these four major domains. Making such portfolio overlays is the main purpose of the technique.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=1021 height=513 id="Picture_x0020_1" src="cid:image002.gif@01D08F23.49CB9350"></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The nodes are sized with the log(n+1); n is the number of publications. (The “+1” prevents single publications from disappearing.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Best,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Loet<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>PS. This is my second mailing during this week. L.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#44546A'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><hr size=3 width="100%" align=center></span></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Loet Leydesdorff </span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Emeritus</span></i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> University of Amsterdam<br>Amsterdam School of Communication Research (ASCoR)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="mailto:loet@leydesdorff.net" title="mailto:loet@leydesdorff.net"><span style='font-size:10.0pt'>loet@leydesdorff.net </span></a></span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>; </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.leydesdorff.net/" title="http://www.leydesdorff.net/"><span style='font-size:10.0pt'>http://www.leydesdorff.net/</span></a></span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <br></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>Honorary Professor, </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.sussex.ac.uk/spru/"><span style='font-size:9.0pt'>SPRU, </span></a></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>University of Sussex; <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>Guest Professor </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.zju.edu.cn/english/"><span style='font-size:9.0pt'>Zhejiang Univ.</span></a></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>, Hangzhou; Visiting Professor, </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.istic.ac.cn/Eng/brief_en.html"><span style='font-size:9.0pt'>ISTIC, </span></a></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>Beijing;<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>Visiting Professor, </span><a name="_GoBack"></a><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://www.bbk.ac.uk/"><span style='font-size:9.0pt'>Birkbeck</span></a></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif"'>, University of London; <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A'><a href="http://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en"><span style='font-size:9.0pt'>http://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif";color:#44546A'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>