A few nodes on paper to contemplate
#toc #lue #factoid
(defun eval. (e a)
((atom e) (assoc. e a))
((atom (car e))
((eq (car e) 'quote) (cadr e))
((eq (car e) 'atom) (atom (eval. (cadr e) a)))
((eq (car e) 'eq) (eq (eval. (cadr e) a)
(eval. (caddr e) a)))
((eq (car e) 'car) (car (eval. (cadr e) a)))
((eq (car e) 'cdr) (cdr (eval. (cadr e) a)))
((eq (car e) 'cons) (cons (eval. (cadr e) a)
(eval. (caddr e) a)))
((eq (car e) 'cond) (evcon. (cdr e) a))
('t (eval. (cons (assoc. (car e) a)
((eq (caar e) 'label)
(eval. (cons (caddar e) (cdr e))
(cons (list (cadar e) (car e)) a)))
((eq (caar e) 'lambda)
(eval. (caddar e)
(append. (pair. (cadar e) (evlis. (cdr e) a))
#eval #lisp #1960s
“PageRank for neurons is one way to describe the working architecture of the brain. “
#brain #neural #network #nn #how #google #search #dyson #notsure
I knew my grandchild’s great great grandparents.
Athanasius of Alexandria
Sack of Rome
Hilda of Whitby
Synod of Whitby
Muslin Invasion of Spain
William the Pious
Eric the Red
William the Conqueror
Hildegard of Bingen
Richard the Lionheart
Battle of Mohi
Henry the Navigator
Joan of Arc
Leonardo da Vinci
Battle of Vienna
James Clerk Maxwell
me centered, overlapping lives, overlapping life spans
100 watts/pound (helicopter)
The theoretical value for is 2.
With the mass flow pinned down as ρVS and with the deflection
speed proportional to the product of α and V, the lift on a wing is
proportional to αρV2S.
W/S=0.38V2 The Simple Science of Flight revised page 9
W=0.3ρV2S ibid page 5
ρ=1.25 kg/m3 sea level
#flight #aero #physics #force
"When power is Variable, Power controls airspeed."
"When power is fixed, Pitch controls airspeed."
In general, airplanes go where you point them, and go as fast as the power dictates. This is the easiest way to fly, and it works in all airplanes.
#flight #aero #physics
#surveyor #gnc #pid #how #moon #nasa #1960s
"vernier engine throttle settings were controlled using a proportional-plus-derivative feedback loop closed around the measured vs. desired velocity magnitude as a function of altitude, represented by the [~parabolic] descent contour"
Surveyor Spacecraft Automatic Landing System
Sam W. Thurman
#pdf #pdfpdf #gncgnc #pidpid #howhow #november #2015
"The total force exerted on an 800 by 800 meter solar sail, for example, is about 5 newtons (1.1 lbf) at Earth's distance from the Sun,"
» "A gigawatt (big) coal-burning power plant burns one ton of coal every seven seconds" = ~40 ft^3 http://bit.ly/j9X1cM
A cruising #747 burns about a gallon of jet fuel each second. http://bit.ly/747-gallon-a-second #energy (43 KJ/kg)
CF6 61,500 lbf thrust; LM2500 33,600HP 24MW
X-15 “It pumped roughly 30 gallons of LOX and ammonia every second into the rocket engine combustion chamber at 600psi”
At the edge of Space - The X-15 Flight Program p40
#engine #jet #thrust
"in a 2–MW wind turbine, the weight of the rotor and the tower is typically about 250 tons [...] a kite generator of the same rated power can be obtained using a 500–m2 kite and cables 1000–m long, with a total weight of about 2 tons only."
southern yellow pine, ground up and compressed to make a heating product generating some 8,000 BTUs per pound (coal runs 10,000 to 12,000) (23-31 MJ/kg)
annual capacity of 750,000 tons
They determined that the Waycross mill needed to load a 40-car train of identical 100-ton, six-hatch, four-bay covered hoppers every other day. That would put 15 4,000-ton trains -- 60,000 tons worth -- at the port every 30 days.
#solarsystem #asteroid #bolide #comet
Matter shapes the geometry of space and the geometry of space tells matter how to move - Physicist John Wheeler to Margaret Geller
#gravity #relativity #lue #physics
I’m me. I’m here.
#narrative #story #physics #identity #id
“Quantum mechanics predicts what is likely to happen while classical physics records what did happen.”
Freeman Dyson, The Scientist as Rebel p222
“Everything in the future is a wave, everything in the past is a particle.” Quoted by Freeman Dyson in J.D.Barrow, P.C.W.Davies and C.L.Harper (eds), “Science and Ultimate Reality,” Cambridge University Press, Cambridge (2004), p.83 https://sureshemre.wordpress.com/2013/04/27/past-is-a-particle-future-is-a-wave/ #time
Be here now
I was waiting for my ride to come. The sun had just gone down. The night was getting colder. There was noone else around. And I was thinking as I sometimes do, when entertainment fails, of poverty and war and hate and jail.
The reason that I seldom sing a song about important things is importance hardly ever brings a smile. I will try to make you happy while you’re here then you can go outside and act as sad and worried as you like.
The bread distributed during mass has a high significance for Christians : it is the body of Christ, their Lord and God. If you do not share our faith in the living presence of Christ in the eucharistic bread, we ask you not to join your neighbours at communion time.
from the bulletin
Notre Dame, Paris
20 September 1997
Willing suspension of disbelief
#samba #rhythm #music
“May God have mercy on their souls.”
In other circumstances, the religious reference would make Randy uncomfortable, but here it seems like the only appropriate thing to say. Think what you will about religious people, they always have something to say at times like this. What would an atheist come up with? Yes, the organisms inhabiting that submarine must have lost their higher neural functions over a prolonged period of time and eventually turned into pieces of rotten meat. So what?
Neal Stephenson - Cryptonomicon
#atheist #atheism #religion #death #neal
Say ‘Merry Christmas!’ Jim, and let’s be happy.
#christmas #susan #quote
"The neural network of the worm Caenorhabditis elegans, the power grid of the western United States, and the collaboration graph of film actors are shown to be small-world networks. " Collective dynamics of /`small-world/' networks : Abstract : Nature http://www.nature.com/nature/journal/v393/n6684/abs/393440a0.html
websites with navigation menus, food chains, electric power grids, metabolite processing networks, networks of brain neurons, voter networks, telephone call graphs, and social influence networks. ... connected proteins ... transcriptional networks,
#network #graph #max #good #math #january #2015 #good #neural #grid #movie #eclectic #short #abstract #random #interesting
P(B|E) = P(B) X P(E|B) / P(E)
#stats #statistics #bayes #bayesian #math
I wanna have God's protection
I wanna be his best friend
I wanna know the cosmic answer of the universe
I wanna be everywhere all the time
Forever one with the great unknown
This is just my teenage prayer
I hope you'll understand
#prayer #humor #chandler
Christ has died. Christ has risen. Christ will come again.
#forest #wood #global #map #tree
#population #global #map
.@rushkoff "Our problem is not that we don't have enough stuff -- it's that we don't have enough ways for people to work and prove that they deserve this stuff." http://www.cnn.com/2011/OPINION/09/07/rushkoff.jobs.obsolete/index.html?hpt=hp_c1
Making paper: the four Fs: "Fuel, fiber, freight and folks. Those are the big cost drivers in our business.
Lincoln Paper and Tissue produces 200 tons of tissue a day that is destined to become dyed paper napkins
A cord weighs about 2 tons and makes 1,000-2,000 pounds of paper (depending on the process)
#paper #business #maine #forest #labor #money
David Keith: “Every author’s story is shaped by his or her biases. The remainder of this preface discloses some of mine.”
“Humanity has caused what in my view is an environmental holocaust in[?} lots of things I love” ~4:00
“I like these things but I understand other people may not”
Boston, as the Eagle and the Wild Goose See It
Artist: James Wallace Black (American, 1825–1896)
#photo #1860 #boston #balloon #flight
Galileo's sketches of the moon from Sidereus Nuncius.
They sat quietly, as the day deepened, sunlight from the turret slowly edging up the wall of paintings. Pasquale's eyes felt heavy and he thought that it might be the most intimate thing possible, to fall asleep next to someone in the afternoon.
page 273 of the paperback ISBN 978-0-06-182817-8 that I picked up at the dump.
10 Newton ~= 1kg
the full moon viewed from Earth is about 1⁄2 degree, or 30 arc minutes
Most things in the solar system rotate counterclockwise, viewed from the north
31,536,000 seconds in a year
1 m/s ~= 2.25 mph
Fake it 'till you make it
I believe different things in different contexts
Nobody knows the future.
Predicting the future and being right is not knowing the future.
Be here now.
The Cloud of Unknowing
100 to 400 billions stars in the Milky Way
“the blissful union of biscuit and #tea combined”
What is knowable?
What does it mean to know something?
Who can I trust?
How do you think about the future?
Geometric proof of Kepler's law
Forest & paper industry stats
Henk Tennekes expressions
God of the gaps
Bayesian, Kalman, Convolutional Neural Network
Galileo's moon drawings
Devil Wears Prada - Cerulean
Surveyor vertical channel control law
Charlotte going to Brady’s birthday party - Faure Pavan
Queen accepting flower by the palace fence - #love
list.h in Linux
Bayes - Bayesian
Judy Send in Marigold - tea and biscuit
Picasso - Femme
Bayeux Tapestry - Halley’s Comet
Slow AI - Charlie Stross - Dude, you broke the future! - http://bit.ly/slow-ai-charlie-stross - http://www.antipope.org/charlie/blog-static/2018/01/dude-you-broke-the-future.html
The Interface Culture - Neal Stephenson - from In the beginning was the command line - http://bit.ly/the-interface-culture-neal-stephenson - https://docs.google.com/document/d/1wWalDIvrcycnigiElv6QCRvd8I6LD0Zn72XK-l1OZ7k/edit