It was a struggle of some years to
get model simulations to accurately reflect what was measured in the field.
Not exact matches
The
model will rarely
get this type of backs - to - the wall result right because unless a team's shooting or defending is truly appalling, if they dominate possession then across 2000
simulation runs they'll tend to come out on top.
Even when Unger adjusted his
model to account for the fact that not all patients may
get the new treatment, and even when he lowered the effect of the new treatment to three, not five years, the
model showed a benefit of at least 2 million years in nearly every
simulation.
At times, researchers had to invent new
modeling capabilities to
get the
simulations to work, such as mapping of fire - generated environmental temperatures onto the structural components of the buildings.
Computer
simulation is similar, it's reductionist; you've
got these parts, you want to see how they interact, so you build a
model and compare it to the real world.
Re-analysis data are results from atmospheric
models where observed data have been fed into the
models and used to correct the
simulation in order to try to
get a best possible description of the real atmosphere.
# 10: It's
getting real: testing flight hardware with mission control code 18 December 2017 With the flight
models of the CHEOPS spacecraft and telescope maturing, crucial tests can now be run with real hardware in place of
simulations.
So in essence, one would use the difference in the
modeled response in the various
simulations to derive E, then see if one used the derived E and put the sum back together would you
get the same answer.
Take
simulation modeling, which is
getting more and more complex as new
But a trimer
simulation requires
modeling almost 400,000 atoms with increasingly complex physics calculations as the system
gets larger.
Other scientists caution that the interiors of super-Earth may still
get hot enough to melt their iron cores despite the pressure due to other factors not yet considered by the
model simulation (New Scientist, November 6, 2010; and Morard et al, 2010).
Digital
simulations and
models can help students not only better understand various disciplines, but also
get acquainted with the wonders of the modern world.
To
get a more concrete sense of the extent to which various factors play into the targeting of teachers for layoffs, we ran
simulations based on the effects calculated by our statistical
model.
As the C7.R has no doubt spent many hours in the wind tunnel and computer
simulation, it will be interesting to see how the aero work for the track car
gets transferred to the production C7 Corvette's rumored high performance
models.
The ASCII - based fantasy management game with a
simulation model so detailed it gives rise to thousands of emergent stories, Dwarf Fortress is unlike anything else, provided you're prepared to
get to grips with its unfriendly interface.
For reference, if you plot the equivalent quantities in the
model that were in their figures, you'd
get this: (for 5 different
simulations).
-- Computers with more TFLOPs, memory, and I / O, since a lot of
simulations use methods that require
modeling something physical with a large collection of elements small enough to
get accurate enough.
Looking over long term
simulations in some of the AR4
models, I've often
gotten the impression of a decadal warming / plateau alternation (and in some the Dust Bowl warm years even line up with a warm phase).
I haven't
got to the bottom of this yet, but there are several plausible explanations: (i) some of the
simulations in the downloaded
models from the CMIP3 ensemble stop early, affecting the whole envelope of results, (ii) the use of common EOFs fail to capture large - scale temperature patters that are too different from the past.
The modelers could consider varying the change i n forcing in a long series of
simulations / samples from the
model population (4, 3.5, 3, 2.5 etc) until they
got some means consistently below the mean temperature.
While I need to
get around to actually publishing this, here in a nutshell is what I think is wrong with climate
model simulations of water vapor feedback.
Reason: With complicated
simulation model, there is a tendency to
get hoisted on the petard of it's own internal structural entropy
It's still qualitative however, and
getting a better handle on the question requires radiative transfer
modeling and
simulations that can adequately handle a greenhouse - free atmosphere without blowing up.
Summary It is concerning (to FOMD) that Lockheed's press release does not mention any breakthroughs in plasma
simulation algorithms... because without reliable
models, no - one's design is likely to
get much traction... plasma machines being too complicated and expensive for «cut - and - try» engineering to work very well.
I am sure that physicists would have preferred to
get by with just
simulations, but they knew that real world tests were the only way to evaluate the
models they had.
I understand that they run an ensemble of
simulations, but as the ice
gets thinner with time, there are going to be events that the
model does not take into account for the near - term.
One of the consequences is that if you run multiple computer
simulations of earth's climate, then average the results, the simulated ENSO events
get scattered throughout time and end up being averaged out, so that the
model average ends up looking like it doesn't have a strong ENSO impact even though the individual
model runs do.
When they look at climate changes in the distant past (paleoclimate), and at
simulations from complex climate
models, they
get about the same result: if the amount of carbon dioxide in the atmosphere doubles, temperatures will rise between 2 °C and 4.5 °C, most likely 3 °C.
I'd recommend to watch this stunning
model simulation: GOCART - GEOS5 Their effect is not global, but regionally so strong that we
get a discernable global effect.
Or that any data can be fed into a climate
model and
get back correct past climate
simulations?
It was possible to
get a crude climate representation without the tuning, but the best
simulations relied on this back - and - forth between
model and observation.
«We should not be using public money to pay for faster and faster computers so that increasingly fine - grained climate
models can be subjected to ever larger numbers of
simulations until we have
got the data to test whether the predictions of existing
models are confirmed (or not disconfirmed) by the evidence.»