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  • Computer Operations and Hardware  (13)
  • Numerical Analysis  (5)
  • Attenuation, optical beam transmission; Chlorophyll total; Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 437; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_B; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 768; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 614; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 239; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Transmissometer, WET Labs CST, SN 992DR; Turbidity (Nephelometric turbidity unit)  (2)
  • Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 443; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_A; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 571; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 611; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 205; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Turbidity (Nephelometric turbidity unit)  (2)
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Years
  • 1
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    Physical oceanography at near field seafloor observatory DELOS A, off the coast of Angola, in the South East Atlantic Ocean, 2010-02-19 to 2010-08-01, deployment 3 (2016)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 443; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_A; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 571; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 611; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 205; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 291005 data points
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    DATA PANGAEA
  • 2
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    Physical oceanography at near field seafloor observatory DELOS A, off the coast of Angola, in the South East Atlantic Ocean, 2010-08-18 to 2011-01-17, deployment 4 (2016)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 443; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_A; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 571; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 611; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 205; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 217068 data points
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    DATA PANGAEA
  • 3
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    Physical oceanography at far field seafloor observatory DELOS B, off the coast of Angola, in the South East Atlantic Ocean, 2010-02-18 to 2010-07-06, deployment 3 (2014)
    PANGAEA
    Details
    Publication Date: 2024-02-28
    Keywords: Attenuation, optical beam transmission; Chlorophyll total; Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 437; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_B; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 768; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 614; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 239; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Transmissometer, WET Labs CST, SN 992DR; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 229002 data points
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    DATA PANGAEA
  • 4
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    Physical oceanography at far field seafloor observatory DELOS B, off the coast of Angola, in the South East Atlantic Ocean, 2010-08-30 to 2011-01-15, deployment 4 (2014)
    PANGAEA
    Details
    Publication Date: 2024-02-28
    Keywords: Attenuation, optical beam transmission; Chlorophyll total; Conductivity; Conductivity sensor, Aanderaa, type 3919, SN 437; DATE/TIME; Deep-ocean Environmental Long-term Observatory System; DELOS; DELOS_B; Density, mass density; DEPTH, water; Fluorometer, WET Labs ECO FLNTURTD, SN 768; Monitoring station; MONS; Oxygen; Oxygen optode, Aanderaa, type 3830, SN 614; Oxygen saturation; Pressure, water; Pressure sensor, Aanderaa, type 4017E, SN 239; Salinity; Sound velocity in water; South Atlantic Ocean; Temperature, water; Transmissometer, WET Labs CST, SN 992DR; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 226906 data points
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    DATA PANGAEA
  • 5
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    Computational Nanotechnology at NASA Ames Research Center, 1996 (1996)
    In:  CASI
    Details
    Publication Date: 2009-05-10
    Description: Some forms of nanotechnology appear to have enormous potential to improve aerospace and computer systems; computational nanotechnology, the design and simulation of programmable molecular machines, is crucial to progress. NASA Ames Research Center has begun a computational nanotechnology program including in-house work, external research grants, and grants of supercomputer time. Four goals have been established: (1) Simulate a hypothetical programmable molecular machine replicating itself and building other products. (2) Develop molecular manufacturing CAD (computer aided design) software and use it to design molecular manufacturing systems and products of aerospace interest, including computer components. (3) Characterize nanotechnologically accessible materials of aerospace interest. Such materials may have excellent strength and thermal properties. (4) Collaborate with experimentalists. Current in-house activities include: (1) Development of NanoDesign, software to design and simulate a nanotechnology based on functionalized fullerenes. Early work focuses on gears. (2) A design for high density atomically precise memory. (3) Design of nanotechnology systems based on biology. (4) Characterization of diamonoid mechanosynthetic pathways. (5) Studies of the laplacian of the electronic charge density to understand molecular structure and reactivity. (6) Studies of entropic effects during self-assembly. Characterization of properties of matter for clusters up to sizes exhibiting bulk properties. In addition, the NAS (NASA Advanced Supercomputing) supercomputer division sponsored a workshop on computational molecular nanotechnology on March 4-5, 1996 held at NASA Ames Research Center. Finally, collaborations with Bill Goddard at CalTech, Ralph Merkle at Xerox Parc, Don Brenner at NCSU (North Carolina State University), Tom McKendree at Hughes, and Todd Wipke at UCSC are underway.
    Keywords: Computer Operations and Hardware
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The Quest for Pi (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This article gives a brief history of the analysis and computation of the mathematical constant Pi=3.14159 ..., including a number of the formulas that have been used to compute Pi through the ages. Recent developments in this area are then discussed in some detail, including the recent computation of Pi to over six billion decimal digits using high-order convergent algorithms, and a newly discovered scheme that permits arbitrary individual hexadecimal digits of Pi to be computed.
    Keywords: Numerical Analysis
    Type: NASA-TM-112037 , NAS 1.15:112037 , NAS-96-015
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    On the Rapid Computation of Various Polylogarithmic Constants (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We give algorithms for the computation of the d-th digit of certain transcendental numbers in various bases. These algorithms can be easily implemented (multiple precision arithmetic is not needed), require virtually no memory, and feature run times that scale nearly linearly with the order of the digit desired. They make it feasible to compute, for example, the billionth binary digit of log(2) or pi on a modest workstation in a few hours run time. We demonstrate this technique by computing the ten billionth hexadecimal digit of pi, the billionth hexadecimal digits of pi-squared, log(2) and log-squared(2), and the ten billionth decimal digit of log(9/10). These calculations rest on the observation that very special types of identities exist for certain numbers like pi, pi-squared, log(2) and log-squared(2). These are essentially polylogarithmic ladders in an integer base. A number of these identities that we derive in this work appear to be new, for example a critical identity for pi.
    Keywords: Numerical Analysis
    Type: NASA-TM-112039 , NAS 1.15:112039 , NAS-96-016
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Array Transposition in SSD (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: One obstacle to running very large two- and three-dimensional codes on the Cray X-MP and Y-MP systems is to efficiently perform array transpositions using SSD storage. This article discusses how such transpositions can be performed by means of algorithms that feature exclusively unit stride, long vector transfers between main memory and SSD, and which only require a single pass through the data (provided sufficient main memory buffers are available).
    Keywords: Computer Operations and Hardware
    Type: RNR-89-012
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Algebraic Nonoverlapping Domain Decomposition Methods for Stabilized FEM and FV Discretizations (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We consider preconditioning methods for convection dominated fluid flow problems based on a nonoverlapping Schur complement domain decomposition procedure for arbitrary triangulated domains. The triangulation is first partitioned into a number of subdomains and interfaces which induce a natural 2 x 2 partitioning of the p.d.e. discretization matrix. We view the Schur complement induced by this partitioning as an algebraically derived coarse space approximation. This avoids the known difficulties associated with the direct formation of an effective coarse discretization for advection dominated equations. By considering various approximations of the block factorization of the 2 x 2 system, we have developed a family of robust preconditioning techniques. A computer code based on these ideas has been developed and tested on the IBM SP2 using MPI message passing protocol. A number of 2-D CFD calculations will be presented for both scalar advection-diffusion equations and the Euler equations discretized using stabilized finite element and finite volume methods. These results show very good scalability of the preconditioner for various discretizations as the number of processors is increased while the number of degrees of freedom per processor is fixed.
    Keywords: Numerical Analysis
    Type: 10th Conference on Finite Element Methods in Fluids; Jan 08, 1998; Tucson, AZ; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Challenges of Future High-End Computing (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The next major milestone in high performance computing is a sustained rate of one Pflop/s (also written one petaflops, or 10(circumflex)15 floating-point operations per second). In addition to prodigiously high computational performance, such systems must of necessity feature very large main memories, as well as comparably high I/O bandwidth and huge mass storage facilities. The current consensus of scientists who have studied these issues is that "affordable" petaflops systems may be feasible by the year 2010, assuming that certain key technologies continue to progress at current rates. One important question is whether applications can be structured to perform efficiently on such systems, which are expected to incorporate many thousands of processors and deeply hierarchical memory systems. To answer these questions, advanced performance modeling techniques, including simulation of future architectures and applications, may be required. It may also be necessary to formulate "latency tolerant algorithms" and other completely new algorithmic approaches for certain applications. This talk will give an overview of these challenges.
    Keywords: Computer Operations and Hardware
    Type: HTMT Workshop; Jan 13, 1998; Pasadena, CA; United States
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    NASA TECHNICAL REPORTS
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