Computing in Science and Engineering
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Web delivery of interactive laboratories: comparing three authoring tools
Computing in Science and Engineering - Tập 4 Số 5 - Trang 74-78 - 2002
As educators know, the more a student interacts with a subject, the better he or she will learn it. This is particularly true in technical subjects. One way to promote interaction is to have "laboratories" in which the student manipulates objects on the computer screen using the keyboard or mouse and then sees those actions' outcome.
#Animation #Laboratories #Magnets #Physics education #Uniform resource locators #Java #Cloning #Built-in self-test #Mice
Treading new ground [tire industry]
Computing in Science and Engineering - Tập 4 Số 5 - Trang 12-13 - 2002
A common interest in nonlinear dynamics and computational mechanics, together with forward-looking, supportive management, has brought engineers and scientists from Sandia National Laboratory in Albuquerque, New Mexico, together with their Goodyear counterparts to collaborate on several projects destined to improve the way tires are built and tested.
#Tires #Computational modeling #Predictive models #Nuclear weapons #Production #Automotive materials #Manufacturing processes #Steel #Software engineering #Nuclear power generation
Parallel implementation issues: global versus local methods
Computing in Science and Engineering - Tập 4 Số 5 - Trang 26-31 - 2002
Spectral elements are a potential alternative to the spectral transform method widely used in atmospheric general circulation models. A semi-implicit formulation permits larger time steps than an explicit formulation. Thus, a semi-implicit 3D spectral-element dynamical core should achieve high performance levels on microprocessor-based parallel clusters and substantially accelerate the climate sim...... hiện toàn bộ
#Atmospheric modeling #Spatial resolution #Delay #Equations #Fast Fourier transforms #Concurrent computing #Distributed computing #Weather forecasting #Computational modeling #Parallel processing
Applying local discretization methods in the NASA finite-volume general circulation model
Computing in Science and Engineering - Tập 4 Số 5 - Trang 49-54 - 2002
The general circulation model, developed at the NASA Goddard Space Flight Center for climate simulations and other meteorological applications, emphasizes the conservative and monotonic transport and achieves sufficient accuracy for the global consistency of climate processes.
#NASA #Atmospheric modeling #Atmosphere #Concurrent computing #Distributed computing #Computational modeling #Predictive models #Piecewise linear approximation #Grid computing #Partial differential equations
Climate modeling with spherical geodesic grids
Computing in Science and Engineering - Tập 4 Số 5 - Trang 32-41 - 2002
A new approach to climate simulation uses geodesic grids generated from an icosahedron and could become on attractive alternative to current models. We implemented an atmospheric general circulation model using a geodesic discretization of the sphere. Our model uses the message-passing interface and runs efficiently on massively parallel machines.
#Oceans #Atmospheric modeling #Computational modeling #Finite difference methods #Equations #Mesh generation #Atmosphere #Power harmonic filters #Solid modeling #Carbon dioxide
The right angle: precise numerical orthogonality in eigenstates
Computing in Science and Engineering - Tập 4 Số 5 - Trang 91-97 - 2002
Solutions of the Schrodinger equation that pertain to different energies are orthogonal by virtue of quantum dynamics. However, when we obtain such solutions numerically using library differential equation solvers, and when the inner product is defined by numerical quadrature, the result is not sufficiently orthogonal for certain purposes. This paper shows how to construct stable finite-difference...... hiện toàn bộ
#Probes #Wave functions #Quantum mechanics #Photovoltaic effects #Mesons #Absorption #Vacuum systems #Electrons #Radiofrequency interference
Message passing: from parallel computing to the grid
Computing in Science and Engineering - Tập 4 Số 5 - Trang 70-73 - 2002
Over the past decades, the computational science community has debated the best architecture for parallel computing. However, experience has found there is an almost irreconcilable difference between the way users would like to write their software and the way machines must be instructed to run efficiently. The use of message passing in parallel computing is a reasonable decision, because the resu...... hiện toàn bộ
#Message passing #Parallel processing #Web services #XML #Distributed computing #Concurrent computing #Grid computing #Databases #Computer architecture #Computer aided instruction
Intensity-modulated radiation therapy
Computing in Science and Engineering - Tập 4 Số 5 - Trang 8-9 - 2002
Radiation therapy is a tricky business. The goal is to deliver as much radiation as possible to a tumor while sparing nearby noncancerous tissue. A newer approach, called intensity-modulated radiation therapy (IMRT), relaxes the requirement for a uniform dose distribution, yet delivers the radiation more accurately to the cancerous region. This dose distribution, created by small beamlets that can...... hiện toàn bộ
#Biomedical applications of radiation #Cancer #Medical treatment #Neoplasms #Collimators #Cities and towns #Spinal cord #Intensity modulation #Brushes
Random Sampling Using -Vector
Computing in Science and Engineering - Tập 21 Số 1 - Trang 94-107 - 2019
Testing and evaluating atmospheric climate models
Computing in Science and Engineering - Tập 4 Số 5 - Trang 64-69 - 2002
Model validation is a crucial process that underpins model development and gives confidence to the results from running models. This article discusses a range of techniques for validating atmosphere models given that the atmosphere is chaotic and incompletely observed.
#Testing #Atmospheric modeling #Atmosphere #Equations #Physics #Chemistry #Chaos #Robust stability #Oceans #Ice
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