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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of refractive index increment for molecular weight determination by light scattering (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 27 (1958), S. 575-577 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1202711553
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Experimental investigation of shell-model excitations of ^{89}Zr up to high spin (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-09-11
    Description: Author(s): S. Saha, R. Palit, J. Sethi, T. Trivedi, P. C. Srivastava, S. Kumar, B. S. Naidu, R. Donthi, S. Jadhav, D. C. Biswas, U. Garg, A. Goswami, H. C. Jain, P. K. Joshi, G. Mukherjee, Z. Naik, S. Nag, V. Nanal, R. G. Pillay, S. Saha, and A. K. Singh Near yrast states in 89 Zr were investigated up to high spin using the fusion evaporation reaction 80 Se( 13 C, 4 n ) at an incident beam energy of 50 MeV. Excited levels of 89 Zr have been observed up to ∼10 MeV excitation energy and spin ∼37/2 ℏ using the prompt gamma spectroscopy technique with the India... [Phys. Rev. C 86, 034315] Published Mon Sep 10, 2012
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Prompt γ spectroscopic studies of fragment nuclei in thermal neutron induced fission of ^{235}U (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-06-23
    Description: Author(s): S. Mukhopadhyay, L. S. Danu, D. C. Biswas, A. Goswami, P. N. Prashanth, L. A. Kinage, A. Chatterjee, and R. K. Choudhury The prompt γ - γ coincidence technique has been used to carry out the spectroscopic study of the level schemes and to derive the relative isotopic yield distributions of fission fragment nuclei employing the 235 U( n t h , f ) reaction for the first time. From the coincidence rates of various Ba isotopes wi... [Phys. Rev. C 85, 064321] Published Fri Jun 22, 2012
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Investigation of the high spin structure of Zr88 (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-04-17
    Description: Author(s): S. Saha, R. Palit, J. Sethi, S. Biswas, P. Singh, T. Trivedi, D. Choudhury, and P. C. Srivastava High spin states of Zr88 were populated with Se80(C13, 5n) fusion evaporation reaction. A thin target as well as Au backed target were used in two different experiments for the present study. Excited levels of Zr88 have been observed up to spin ∼20ℏ and an excitation energy of ∼10 MeV. Spin and pari... [Phys. Rev. C 89, 044315] Published Wed Apr 16, 2014
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Yrast structure of the shell model nucleus Nb89 (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-12
    Description: Author(s): Purnima Singh, R. Palit, S. Saha, J. Sethi, S. Biswas, D. Choudhury, P. C. Srivastava, and T. Trivedi Yrast and near-yrast states in odd-A Nb89 were investigated using the Cu65(Si28,2p2n) reaction at a beam energy of 105 MeV. The γ-ray coincidence events were recorded with the Indian National Gamma Array spectrometer. About 30 new transitions have been observed extending the level structure of this ... [Phys. Rev. C 90, 014306] Published Fri Jul 11, 2014
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Evolution of octupole collectivity in ^{221}Th (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-22
    Description: Author(s): S. K. Tandel, M. Hemalatha, A. Y. Deo, S. B. Patel, R. Palit, T. Trivedi, J. Sethi, S. Saha, D. C. Biswas, and S. Mukhopadhyay Reflection-asymmetric octupole structures are studied in the transitional nucleus 221 Th. There are several modifications at intermediate spins to the previously reported yrast structure. The level scheme is considerably extended with yrast states up to (39/2) ℏ established. A nonyrast octupole struct... [Phys. Rev. C 87, 034319] Published Thu Mar 21, 2013
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    I/O Performance Characterization of Lustre and NASA Applications on Pleiades (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper we study the performance of the Lustre file system using five scientific and engineering applications representative of NASA workload on large-scale supercomputing systems such as NASA s Pleiades. In order to facilitate the collection of Lustre performance metrics, we have developed a software tool that exports a wide variety of client and server-side metrics using SGI's Performance Co-Pilot (PCP), and generates a human readable report on key metrics at the end of a batch job. These performance metrics are (a) amount of data read and written, (b) number of files opened and closed, and (c) remote procedure call (RPC) size distribution (4 KB to 1024 KB, in powers of 2) for I/O operations. RPC size distribution measures the efficiency of the Lustre client and can pinpoint problems such as small write sizes, disk fragmentation, etc. These extracted statistics are useful in determining the I/O pattern of the application and can assist in identifying possible improvements for users applications. Information on the number of file operations enables a scientist to optimize the I/O performance of their applications. Amount of I/O data helps users choose the optimal stripe size and stripe count to enhance I/O performance. In this paper, we demonstrate the usefulness of this tool on Pleiades for five production quality NASA scientific and engineering applications. We compare the latency of read and write operations under Lustre to that with NFS by tracing system calls and signals. We also investigate the read and write policies and study the effect of page cache size on I/O operations. We examine the performance impact of Lustre stripe size and stripe count along with performance evaluation of file per process and single shared file accessed by all the processes for NASA workload using parameterized IOR benchmark.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN6025 , HiPC 2012; Dec 18, 2012 - Dec 21, 2012; Pune; India
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    An Application-Based Performance Evaluation of NASAs Nebula Cloud Computing Platform (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The high performance computing (HPC) community has shown tremendous interest in exploring cloud computing as it promises high potential. In this paper, we examine the feasibility, performance, and scalability of production quality scientific and engineering applications of interest to NASA on NASA's cloud computing platform, called Nebula, hosted at Ames Research Center. This work represents the comprehensive evaluation of Nebula using NUTTCP, HPCC, NPB, I/O, and MPI function benchmarks as well as four applications representative of the NASA HPC workload. Specifically, we compare Nebula performance on some of these benchmarks and applications to that of NASA s Pleiades supercomputer, a traditional HPC system. We also investigate the impact of virtIO and jumbo frames on interconnect performance. Overall results indicate that on Nebula (i) virtIO and jumbo frames improve network bandwidth by a factor of 5x, (ii) there is a significant virtualization layer overhead of about 10% to 25%, (iii) write performance is lower by a factor of 25x, (iv) latency for short MPI messages is very high, and (v) overall performance is 15% to 48% lower than that on Pleiades for NASA HPC applications. We also comment on the usability of the cloud platform.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN5169 , 14th IEEE International Conferenc eon HPCC-2012; Jun 25, 2012; Liverpool; United Kingdom
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    A Look at the Impact of High-End Computing Technologies on NASA Missions (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: From its bold start nearly 30 years ago and continuing today, the NASA Advanced Supercomputing (NAS) facility at Ames Research Center has enabled remarkable breakthroughs in the space agency s science and engineering missions. Throughout this time, NAS experts have influenced the state-of-the-art in high-performance computing (HPC) and related technologies such as scientific visualization, system benchmarking, batch scheduling, and grid environments. We highlight the pioneering achievements and innovations originating from and made possible by NAS resources and know-how, from early supercomputing environment design and software development, to long-term simulation and analyses critical to design safe Space Shuttle operations and associated spinoff technologies, to the highly successful Kepler Mission s discovery of new planets now capturing the world s imagination.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN4714
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Data Mining for Anomaly Detection (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Vehicle Integrated Prognostics Reasoner (VIPR) program describes methods for enhanced diagnostics as well as a prognostic extension to current state of art Aircraft Diagnostic and Maintenance System (ADMS). VIPR introduced a new anomaly detection function for discovering previously undetected and undocumented situations, where there are clear deviations from nominal behavior. Once a baseline (nominal model of operations) is established, the detection and analysis is split between on-aircraft outlier generation and off-aircraft expert analysis to characterize and classify events that may not have been anticipated by individual system providers. Offline expert analysis is supported by data curation and data mining algorithms that can be applied in the contexts of supervised learning methods and unsupervised learning. In this report, we discuss efficient methods to implement the Kolmogorov complexity measure using compression algorithms, and run a systematic empirical analysis to determine the best compression measure. Our experiments established that the combination of the DZIP compression algorithm and CiDM distance measure provides the best results for capturing relevant properties of time series data encountered in aircraft operations. This combination was used as the basis for developing an unsupervised learning algorithm to define "nominal" flight segments using historical flight segments.
    Keywords: Avionics and Aircraft Instrumentation
    Type: NASA/CR-2013-217973 , NF1676L-16156
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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