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| [[Image:ulman2.png|400px|right|thumb|[[Multiple nuclei model]] by [[Chauncy Harris]] and Edward Ullman]]
| | Hello and welcome. My name is Irwin and I completely dig that name. Hiring is her day occupation now and she will not change it anytime quickly. Minnesota has usually been his house but his wife desires them to transfer. Doing ceramics is what her family and her appreciate.<br><br>my webpage: [http://www.aseandate.com/index.php?m=member_profile&p=profile&id=13345213 home std test kit] |
| '''Edward Louis Ullman''' (1912 – 1976) was an [[United States|American]] [[geographer]]. He was trained as a geographer at University of Chicago where he was influenced by the urban and economic emphasis in social science. His study and dissertation on the economic aspects of Mobile, Alabama began a career of transit studies. He was the [[Office of Strategic Services]] transportation specialist in World War II. <ref>Fournier, Eric J. "Edward Ullman, the Port of Mobile, and the birth of modern economic geography". The Role of the South in the making of American Geography: Centennial of the American Association of Geographers, 2004. p 320.</ref>
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| After the war he served as a lieutenant in the United States Navy Reserve and was an economist for the [[United States Maritime Commission]]. He also did research for the Joint Chiefs of Staff in the Pentagon and the State Department. In 1951 he began his academic work at the [[University of Washington]] and was a Fulbright research professor at the [[Sapienza University of Rome]] in 1956-1957. He did academic work in Germany and Israel. The [[Nuclear Regulatory Commission]] and [[Amtrak]] utilized his services in their formative years.<ref>Who's Who is America. 1976-1977. v. 2, p 3197.</ref>
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| He proposed that [[trade]] was an interaction based on three phenomena: ''[[:wikt:complementarity|complementarity]]'', ''[[intervening opportunities]]'', and ''[[transferability of commodities]]''.
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| The level of interaction can be measured by the ''Gravity model'' of trade:
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| <math> | |
| I_{i,j} = \frac{p_ip_j}{d_{i,j}^\beta}
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| </math> | |
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| Where:
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| *I: Level of interaction between i,j. alternatively, quantity of trade between i,j.
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| *P<sub>i</sub> = population of i
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| *D<sub>i,j</sub> = distance separating i,j
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| *β = impedance factor
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| == Notes ==
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| {{Reflist}}
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| ==External links==
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| *[http://faculty.washington.edu/krumme/faculty/ullman.html University of Washington]
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| {{Authority control|VIAF=24663784}}
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| {{Persondata <!-- Metadata: see [[Wikipedia:Persondata]]. -->
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| | NAME = Ullman, Edward
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| | ALTERNATIVE NAMES =
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| | SHORT DESCRIPTION = American geographer
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| | DATE OF BIRTH = July 24,1912
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| | PLACE OF BIRTH = Chicago
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| | DATE OF DEATH = 1976
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| | PLACE OF DEATH =
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| }}
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| {{DEFAULTSORT:Ullman, Edward}}
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| [[Category:American geographers]]
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| [[Category:1912 births]]
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| [[Category:1976 deaths]]
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| [[Category:University of Washington faculty]]
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| [[Category:People from Chicago, Illinois]]
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| {{US-scientist-stub}}
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| {{Geographer-stub}}
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Hello and welcome. My name is Irwin and I completely dig that name. Hiring is her day occupation now and she will not change it anytime quickly. Minnesota has usually been his house but his wife desires them to transfer. Doing ceramics is what her family and her appreciate.
my webpage: home std test kit