nhaliday + lectures   56

Fitting a Structural Equation Model
seems rather unrigorous: nonlinear optimization, possibility of nonconvergence, doesn't even mention local vs. global optimality...
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november 2017 by nhaliday
Flows With Friction
To see how the no-slip condition arises, and how the no-slip condition and the fluid viscosity lead to frictional stresses, we can examine the conditions at a solid surface on a molecular scale. When a fluid is stationary, its molecules are in a constant state of motion with a random velocity v. For a gas, v is equal to the speed of sound. When a fluid is in motion, there is superimposed on this random velocity a mean velocity V, sometimes called the bulk velocity, which is the velocity at which fluid from one place to another. At the interface between the fluid and the surface, there exists an attraction between the molecules or atoms that make up the fluid and those that make up the solid. This attractive force is strong enough to reduce the bulk velocity of the fluid to zero. So the bulk velocity of the fluid must change from whatever its value is far away from the wall to a value of zero at the wall (figure 7). This is called the no-slip condition.

http://www.engineeringarchives.com/les_fm_noslip.html
The fluid property responsible for the no-slip condition and the development of the boundary layer is viscosity.
https://www.quora.com/What-is-the-physics-behind-no-slip-condition-in-fluid-mechanics
https://www.reddit.com/r/AskEngineers/comments/348b1q/the_noslip_condition/
https://www.researchgate.net/post/Can_someone_explain_what_exactly_no_slip_condition_or_slip_condition_means_in_terms_of_momentum_transfer_of_the_molecules
https://en.wikipedia.org/wiki/Boundary_layer_thickness
http://www.fkm.utm.my/~ummi/SME1313/Chapter%201.pdf
org:junk  org:edu  physics  mechanics  h2o  identity  atoms  constraint-satisfaction  volo-avolo  flux-stasis  chemistry  stat-mech  nibble  multi  q-n-a  reddit  social  discussion  dirty-hands  pdf  slides  lectures  qra  fluid  local-global  explanation 
september 2017 by nhaliday
Lecture 3: Global Energy Cycle
solar flux, albedo, greenhouse effect, energy balance, vertical distribution of energy, tilt and seasons
pdf  slides  nibble  physics  electromag  space  earth  sky  atmosphere  environment  temperature  stock-flow  data  magnitude  scale  phys-energy  distribution  oscillation  cycles  lectures  geography 
august 2017 by nhaliday
Strings, periods, and borders
A border of x is any proper prefix of x that equals a suffix of x.

...overlapping borders of a string imply that the string is periodic...

In the border array ß[1..n] of x, entry ß[i] is the length
of the longest border of x[1..i].
pdf  nibble  slides  lectures  algorithms  strings  exposition  yoga  atoms  levers  tidbits  sequential  backup 
may 2017 by nhaliday
Edge Master Class 2008 RICHARD THALER, SENDHIL MULLAINATHAN, DANIEL KAHNEMAN: A SHORT COURSE IN BEHAVIORAL ECONOMICS | Edge.org
https://twitter.com/toad_spotted/status/878990195953205248
huge popularity of "behavioral economics"among powerful people=largely excitement at how much more control they'd exert over stupider people

Time for Behavioral Political Economy? An Analysis of Articles in Behavioral Economics: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1846184
This study analyzes leading research in behavioral economics to see whether it contains advocacy of paternalism and whether it addresses the potential cognitive limitations and biases of the policymakers who are going to implement paternalist policies. The findings reveal that 20.7% of the studied articles in behavioral economics propose paternalist policy action and that 95.5% of these do not contain any analysis of the cognitive ability of policymakers. This suggests that behavioral political economy, in which the analytical tools of behavioral economics are applied to political decision-makers as well, would offer a useful extension of the research program.

https://www.bloomberg.com/view/articles/2017-07-19/some-countries-like-nudges-more-than-others
Research shows that Americans and conservatives can be less open to cues to change behavior.

It’s For Your Own Good!: http://www.nybooks.com/articles/2013/03/07/its-your-own-good/
- Cass Sunstein

Against Autonomy: Justifying Coercive Paternalism
by Sarah Conly
Cambridge University Press, 206 pp., $95.00

WHO NUDGES THE NUDGERS?: https://jacobitemag.com/2017/10/26/who-nudges-the-nudgers/
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february 2017 by nhaliday

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