Tuesday, July 29, 2008

How big is a floating 5MW wind turbine?

According to Sclavounos (Floating Offshore Wind Turbines: Responses in a Seastate
Pareto Optimal Designs and Economic Assessment) a displacement of between 9800 and 14350 Metric Tons.

» Wind turbine - Wikipedia, the free encyclopedia "The Enercon E-126 delivers up to 6 MW, has an overall height of 198 m (650 ft) and a diameter of 126 meters (413 ft). The Repower 5M delivers up to 5 MW, has an overall height of 183 m (600 ft) and has a diameter of 126 m (413 ft)." / wind turbine big size power stats statistics

For comparison:

  • http://oe.mit.edu/flowlab/pdf/Floating_Offshore_Wind_Turbines.pdf
  • http://en.wikipedia.org/w/index.php?title=USS_Arleigh_Burke_%28DDG-51%29&oldid=226483912
  • http://en.wikipedia.org/w/index.php?title=USS_Zumwalt_%28DDG-1000%29&oldid=228351103
All retrieved 7/29/08

Monday, July 14, 2008

Fwd: George Lakoff, Co-founder/Sr. Fellow, Rockridge Institute; Author, The Political Mind - SendMeRSS

The Commonwealth Club doesn't provide a page to point to for a description of a radio program. So here's their description of one of their program from their RSS feed.

---------- Forwarded message ----------
From: Commonwealth Club Radio Program <alert@sendmerss.com>
Date: Fri, Jun 27, 2008 at 5:24 PM
Subject: George Lakoff, Co-founder/Sr. Fellow, Rockridge Institute; Author, The Political Mind - SendMeRSS
To: mshook@gmail.com


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George Lakoff, Co-founder/Sr. Fellow, Rockridge Institute; Author, The Political Mind - SendMeRSS

George Lakoff, Co-founder/Sr. Fellow, Rockridge Institute; Author, The Political Mind


Leading linguistic and political analyst, George Lakoff, will explain how language can be used as a critical tool in progressive politics, describing how our brains work in relation to society, why language is so important, and how Democrats can use this knowledge to their advantage to win the November elections. Lakoff believes that progressives have been fighting a losing battle in America for the last 30 years because, he says, the majority of citizens vote against their own self interests.


Lakoff is a professor of cognitive linguistics at the University of California, Berkeley, where he has taught since 1972. He has published many scholarly articles and books including The Political Mind (2008) as well as the influential book, Moral Politics: How Liberals and Conservatives Think (2002). Although some of his research involves questions traditionally pursued by linguists, he is best known for his ideas about the centrality of metaphor to human thinking, political behavior and society. He is particularly famous for his concept of the "embodied mind," which he has written about in relation to mathematics. In recent years he has applied his work to the realm of politics, exploring this in his books. He is the co-founder and senior fellow of the progressive think tank, the Rockridge Institute. He previously taught at Harvard University and the University of Michigan. He has been a Fellow at the Center for Advanced Study in the Behavioral Sciences at Stanford and a Visiting Professor at the École des Hautes Études en Sciences Sociales, Paris (1995) and the Linguistics Society of America Summer Institute at the University of New Mexico (Summer, 1995).

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Saturday, July 12, 2008

Telegraphist's Equations

  • http://www.amazon.com/gp/product/0521646456/
  • at Google Book Search
  • Page 82:
    • As an historical example, we can analyze the first transatlantic telegraph cable, laid in 1865. The cable was 3,600 km long and weighed 5,000 tons. The insulator was a vegetable gum called gutta-percha . For this cable L = 460 nH/m, C = 75 pF/m, and R = 7 mQ/m. At a frequency of 2.4 kHz, wL = R, and so the high-resistance assumption is well satisfied for frequencies below 100 Hz. At 12 Hz, we can write a and v as
      • a = v/wRC/2 = 4.4 x 10...
      • v = ...
    • The loss for the entire line is al = 140 dB and the delay is l/v = 210 ms. For comparison, at 3 Hz, the loss in dB and the delay change by a factor of 2, to 70 dB and 420 ms. Thus the 12-Hz component attenuates 70 dB more than the 3-Hz component. In addition, the 12-Hz component arrives 210 ms ahead of the 3-Hz component. In order to improve these characteristics, the signalling speed had to be drastically reduced, to about one word per minute, which was twenty times slower ...

Signal Noise Ratio

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Signal Noise Ratio

  • http://www.librarything.com/card_card.php?book=325583
  • http://www.amazon.com/gp/product/0521646456/
  • Page 137:
    • "Right at 1,200 Hz, signal tones can be detected if they have sound pressure levels of 57 dB or larger. This is 3dB below the noise. This means that Morese Code can be received when the signal power is comparable to the noise power within the critical bandwidth. By contract, an AM or TV boadcaster aims at 50-dB signal-to-noise ratios over much larger bandwidths to provide a clear sound and picture. This means that the NorCal* 40A can communicate at distances of thousands of mile with a transmitter power of 2 W, whereas a broadcaster might use 50 kW for coverage in a single city."

t: signal
t: noise
t: ratio
t: radio
t: electronics
Created: 20060502
t: morse
t: code
t: power
t: shannon


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Thursday, July 03, 2008

iLarry Diamond, Senior Fellow,Hoover Institution; Professor, Centeron Democracy, Development and theRule of Law, Stanford University - SendMeRSS

The Commonwealth Club doesn't provide a page to point to for a description of a radio program. So here's their description of one of their program from their RSS feed.

---------- Forwarded message ----------
From: Commonwealth Club Radio Program <alert@sendmerss.com>
Date: Thu, Jun 12, 2008 at 7:25 PM
Subject: Larry Diamond, Senior Fellow,Hoover Institution; Professor, Centeron Democracy, Development and theRule of Law, Stanford University - SendMeRSS


Larry Diamond, Senior Fellow,Hoover Institution; Professor, Centeron Democracy, Development and theRule of Law, Stanford University - SendMeRSS

The Spirit of Democracy


Larry Diamond, Senior Fellow, Hoover Institution; Professor, Center
on Democracy, Development and the Rule of Law, Stanford University


In 1974, nearly three-quarters of all countries
were dictatorships; today, more than
half are democracies. Diamond contends,
however, that recent efforts to promote
democracy have stumbled and that many
democratic governments are faltering. He
explains that the desire for democracy
runs deep, even in very poor countries,
and proposes that even entrenched regimes
like Iran and China could become
democracies within a generation.
Produced by The Club's International Relations Memeber-Led Forum



This program was recorded in front of a live audience on May 7, 2008

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