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  • Articles  (62)
  • 2015-2019  (48)
  • 1995-1999  (14)
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  • 1
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    Curing kinetics of 4,4′-Methylenebis epoxy and m-Xylylenediamine (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-11-30
    Description: In this paper, the curing kinetics of 4,4′-Methylenebis epoxy resin(TGDDM) and m-Xylylenediamine(m-XDA) was investigated by non-isothermal differential scanning calorimetry(DSC) at various heating rates. Selected non-isothermal methods for analyzing curing kinetics were compared. The activation energy(E) and the correlation coefficient(R) were obtained by different isoconversional methods. The reaction order(n) was obtained by the activation energy in different isoconversional methods for the by Crane equation. The results show that the apparent activation energy are 65.23kJ/mol, 52.20 kJ/mol and 66.10 kJ/mol by using the method of Kissinger, Friedman and F-W-O, the reaction order are 0.911, 0.729 and 0.923 by using the method of Kissinger, Friedman and F-W-O.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Pressure-induced spin reorientation and spin state transition in SrCoO_{3} (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-11-26
    Description: Author(s): J.-Y. Yang, C. Terakura, M. Medarde, J. S. White, D. Sheptyakov, X.-Z. Yan, N.-N. Li, W.-G. Yang, H.-L. Xia, J.-H. Dai, Y.-Y. Yin, Y.-Y. Jiao, J.-G. Cheng, Y.-L. Bu, Q.-F. Zhang, X.-D. Li, C.-Q. Jin, Y. Taguchi, Y. Tokura, and Y.-W. Long A series of high-pressure measurements including resistivity, ac and dc magnetic susceptibility, neutron powder diffraction, and synchrotron x-ray diffraction were performed to investigate the crystal structure and electronic states of the itinerant ferromagnet SrCo O 3 . Two pressure-induced phase tra… [Phys. Rev. B 92, 195147] Published Tue Nov 24, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Experimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe_{1−x} Co_{x} )_{2} As_{2} (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-28
    Description: Author(s): Meng Wang, M. Yi, H. L. Sun, P. Valdivia, M. G. Kim, Z. J. Xu, T. Berlijn, A. D. Christianson, Songxue Chi, M. Hashimoto, D. H. Lu, X. D. Li, E. Bourret-Courchesne, Pengcheng Dai, D. H. Lee, T. A. Maier, and R. J. Birgeneau We report a combined study of the spin resonances and superconducting gaps for underdoped ( T c = 19 K), optimally doped ( T c = 25 K), and overdoped ( T c = 19 K) Ba ( Fe 1 − x Co x ) 2 As 2 single crystals with inelastic neutron scattering and angle resolved photoemission spectroscopy. We find a quasi-two-dimensional sp… [Phys. Rev. B 93, 205149] Published Thu May 26, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    The dynamics of short-scale turbulent fluctuations across low-intermediate-high-confinement transition with lower hybrid current drive in the EAST superconducting tokamak (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-07
    Description: Two different confinement transition discharges, the low-intermediate-high (L-I-H) and the low-intermediate-low (L-I-L) confinement transitions, respectively, have been obtained by lower hybrid current drive with lithium wall conditioning in the EAST superconducting tokamak. The dynamic features of short-scale turbulent fluctuations in the two discharges are investigated by a tangential CO 2 laser collective scattering system. It is found that the great changes of broadband fluctuations in amplitude and structure characteristics are closely related to the choice of the final transition to H-mode. These results could shed light on the understanding of the L-H transition mechanism.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Anisotropy in the Inner Core: Could It Be Due To Low-Order Convection? (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-11-08
    Description: A recently assembled data set of inner core-sensitive free oscillation splitting measurements and body wave differential travel times provides constraints on the patterns of anisotropy in the Earth's inner core. Applying a formalism that allows departures from radial symmetry and cylindrical anisotropy results in models with P-wave velocity distributions whose strength and pattern are incompatible with frozen-in anisotropy, but rather suggest a simple large-scale convection regime in the inner core.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romanowicz -- Li -- Durek -- New York, N.Y. -- Science. 1996 Nov 8;274(5289):963-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉B. Romanowicz, Seismographic Station and Department of Geology and Geophysics, University of California at Berkeley, Berkeley, CA 94720, USA. X.-D. Li and J. Durek, Seismographic Station, University of California at Berkeley, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8875934" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    U-Pb Geochronology of Hydrothermal Zircons from the Early Cretaceous Iron Skarn Deposits in the Handan-Xingtai District, North China Craton (2015)
    Society of Economic Geologists (SEG)
    Details
    Publication Date: 2015-11-10
    Description: The Handan-Xingtai district in the North China craton is one of the most important concentrations of iron skarn deposits in China, with proven reserves of 900 to 1,000 Mt at an average of 40 to 55 wt % Fe. The iron mineralization occurs predominantly along contact zones between Early Cretaceous intermediate-silicic intrusions and Middle Ordovician marine carbonates intercalated with numerous evaporite beds. In this paper, we present textural features and laser ablation ICP-MS U-Pb dating results of hydrothermal zircon from five major iron skarn deposits to place tight constraints on the timing and duration of the district-scale iron mineralization. Zircon grains from the mineralized skarns are anhedral to subhedral crystals and euhedral tetragonal bipyramids. They are closely intergrown or texturally associated with diopside, garnet, epidote, calcite, albite, and phlogopite. Other common minerals in the skarn assemblages include F-rich hornblende, wilkeite-F, F-apatite, and fluorite. Zircon grains typically contain abundant inclusions of skarn minerals and daughter mineral-rich (mostly magnetite, halite, and sylvite) fluid inclusions. Compositionally, these zircon grains have moderately to extremely high Th (518–7,477 ppm) and U (109–25,610 ppm) contents, with highly variable Th/U ratios ranging from 0.01 to 5.23. The morphological, textural, and geochemical features of the zircons confirm their hydrothermal origin and indicate that they most likely precipitated from high-temperature, F-rich, magmatic-derived ore-forming fluids. The hydrothermal zircon grains yield well-defined concordant U-Pb ages for the five studied iron skarn deposits, with weighted mean 206 Pb/ 238 U dates ranging from 133.6 ± 0.9 to 128.5 ± 1.4 Ma (2 ). These ages are remarkably consistent with U-Pb ages (134.1 ± 1.2 to 128.5 ± 0.9 Ma; 2 ) of magmatic zircon grains from the ore-related intrusions in each deposit, demonstrating that iron skarn mineralization was genetically related to the coeval magmatism. Our new geochronological data, when combined with existing isotopic ages, indicate that iron mineralization and associated magmatism in the Handan-Xingtai district took place mainly at the ca. 137–133 and 131–128 Ma intervals. Iron skarn deposits of similar ages also occur widely in other parts of the eastern North China craton, forming the only known giant Mesozoic iron skarn province in a cratonic block on the Earth. The formation of these iron skarn deposits and associated intrusions coincided in time with lithospheric thinning or destruction of the North China craton, strongly suggesting a causal link between the two processes.
    Print ISSN: 0361-0128
    Topics: Geosciences
    Published by Society of Economic Geologists (SEG)
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  • 7
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    SPOP-containing complex regulates SETD2 stability and H3K36me3-coupled alternative splicing (2017)
    Oxford University Press
    Details
    Publication Date: 2017-01-10
    Description: Trimethylation of histone H3K36 is a chromatin mark associated with active gene expression, which has been implicated in coupling transcription with mRNA splicing and DNA damage response. SETD2 is a major H3K36 trimethyltransferase, which has been implicated as a tumor suppressor in mammals. Here, we report the regulation of SETD2 protein stability by the proteasome system, and the identification of SPOP, a key subunit of the CUL3 ubiquitin E3 ligase complex, as a SETD2-interacting protein. We demonstrate that SPOP is critically involved in SETD2 stability control and that the SPOP/CUL3 complex is responsible for SETD2 polyubiquitination both in vivo and in vitro . ChIP-Seq analysis and biochemical experiments demonstrate that modulation of SPOP expression confers differential H3K36me3 on SETD2 target genes, and induce H3K36me3-coupled alternative splicing events. Together, these findings establish a functional connection between oncogenic SPOP and tumor suppressive SETD2 in the dynamic regulation of gene expression on chromatin.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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  • 8
    Electronic Resource
    Electronic Resource
    Adaptive finite element procedures in elasticity and plasticity (1996)
    Springer
    Engineering with computers 12 (1996), S. 120-141 
    Details
    ISSN: 1435-5663
    Keywords: Discontinuous Galerkin ; Error estimation adaptivity ; Postprocessing ; Superconvergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The paper discusses error estimation and h-adaptive finite element procedures for elasticity and plasticity problems. For the spatial discretization error, an enhanced Superconvergent Patch Recovery (SPR) technique which improves the error estimation by including fulfillment of equilibrium and boundary conditions in the smoothing procedure is discussed. It is known that an accurate error estimation on an early stage of analysis results in a more rapid and optimal adaptive process. It is shown that node patches and element patches give similar quality of the postprocessed solution. For dynamic problems, a postprocessed type of error estimate and an adaptive procedure for the semidiscrete finite element method are discussed. It is shown that the procedure is able to update the spatial mesh and the time step size so that both spatial and time discretization errors are controlled within specified tolerances. A time-discontinuous Galerkin method for solving the second-order ordinary differential equations in structural dynamics is also presented. Many advantages of the new approach such as high order accuracy, possibility to filter effects of spurious modes and convenience to apply adaptive analysis are observed. For plasticity problems, some recent work that improved plastic strains and plastic localization is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299397
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    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    STRUCTURAL DYNAMIC ANALYSIS BY A TIME-DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 2131-2152 
    Details
    ISSN: 0029-5981
    Keywords: discontinuous Galerkin finite element method ; predictor-multicorrector ; adaptive time integration ; structural dynamics ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper studies a time-discontinuous Galerkin finite element method for structural dynamic problems, by which both displacements and velocities are approximated as piecewise linear functions in the time domain and may be discontinuous at the discrete time levels. A new iterative solution algorithm which involves only one factorization for each fixed time step size and a few iterations at each step is presented for solving the resulted system of coupled equations. By using the jumps of the displacements and the velocities in the total energy norm as error indicators, an adaptive time-stepping procedure for selecting the proper time step size is described. Numerical examples including both single-DOF and multi-DOF problems are used to illustrate the performance of these algorithms. Comparisons with the exact results and/or the results by the Newmark integration scheme are given. It is shown that the time-discontinuous Galerkin finite element method discussed in this study possesses good accuracy (third order) and stability properties, its numerical implementation is not difficult, and the higher computational cost needed in each time step is compensated by use of a larger time step size.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 10
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    Potential roles of osteopontin and  V 3 integrin in the development of coronary artery restenosis after angioplasty (1997)
    National Academy of Sciences
    Details
    Publication Date: 1997-08-19
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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