The Experts below are selected from a list of 13182 Experts worldwide ranked by ideXlab platform

Igor Sevostianov - One of the best experts on this subject based on the ideXlab platform.

  • randomly oriented cracks in a transversely isotropic material
    International Journal of Solids and Structures, 2018
    Co-Authors: Seyedali Seyedkavoosi, Elena N Vilchevskaya, Igor Sevostianov
    Abstract:

    Abstract Our work focuses on the calculation of the overall elastic properties of a transversely isotropic material containing multiple randomly oriented circular cracks. We first propose a new methodology to estimate (approximately) the contribution of a single arbitrarily oriented crack in an infinite transversely isotropic media into the overall elastic moduli. This effect is described by a forth rank compliance contribution tensor which serves as the Basic Building Block for various homogenization schemes aimed at calculation of the overall elastic properties of the materials containing multiple inhomogeneities. In this paper we use the Mori–Tanaka–Benveniste scheme which coincides with non-interaction approximation for the case of crack-like inhomogeneities. The approach is illustrated by examples of Berea sandstone and wet bovine dentin.

  • on the thermal expansion of composite materials and cross property connection between thermal expansion and thermal conductivity
    Mechanics of Materials, 2012
    Co-Authors: Igor Sevostianov
    Abstract:

    Abstract The paper focuses on the quantitative characterization of heterogeneous microstructures from the point of view of the material’s thermal expansion. First, we derive expression for the second rank thermal expansion contribution tensor of an inhomogeneity and specify it for various inhomogeneity shapes. Case of a spheroidal inhomogeneity in an isotropic material is discussed in detail. Thermal expansion contribution tensor is used as a Basic Building Block to calculate effective thermal expansion of a heterogeneous material and to derive explicit cross-property connection between thermal expansion and thermal resistivity of a composite. We compare our results with experimental data available in literature and with other approaches.

S. Ten Brink - One of the best experts on this subject based on the ideXlab platform.

  • A close-to-capacity dirty paper coding scheme
    IEEE Transactions on Information Theory, 2005
    Co-Authors: Uri Erez, S. Ten Brink
    Abstract:

    The "writing on dirty paper"-channel model offers an information-theoretic framework for precoding techniques for canceling arbitrary interference known at the transmitter. It indicates that lossless precoding is theoretically possible at any signal-to-noise ratio (SNR), and thus dirty-paper coding may serve as a Basic Building Block in both single-user and multiuser communication systems. We design an end-to-end coding realization of a system materializing a significant portion of the promised gains. We employ multidimensional quantization based on trellis shaping at the transmitter. Coset decoding is implemented at the receiver using "virtual bits." Combined with iterative decoding of capacity-approaching codes we achieve an improvement of 2dB over the best scalar quantization scheme. Code design is done using the EXIT chart technique.

Zhen Zhen - One of the best experts on this subject based on the ideXlab platform.

  • the Basic Building Block of lambda router with multimode interference waveguide crossings on silicon on insulator technology
    Journal of Lightwave Technology, 2012
    Co-Authors: Guofang Fan, Regis Orobtchouk, Bing Han, Jm Fedelin, Xinhou Liu, Zhen Zhen
    Abstract:

    Optical properties of the λ-router Basic Building Block are simulated using a matrix method. Experiments are performed for the -router Basic Building Block with multimode-interference (MMI) crossings, which shows large free spectral range (~35 nm) and more than 24 dB on/off contrast of the drop resonance. Theoretical and experimental results reveal that the λ-router Basic Building Block with MMI crossings can suppress the crosstalk (defined as the difference between the drop efficiency and the throughput attenuation at resonance), offer relatively symmetric resonance, and increase the on/off contrast of the drop resonance, compared with a λ-router Building Block using conventional crossings.

Uri Erez - One of the best experts on this subject based on the ideXlab platform.

  • A close-to-capacity dirty paper coding scheme
    IEEE Transactions on Information Theory, 2005
    Co-Authors: Uri Erez, S. Ten Brink
    Abstract:

    The "writing on dirty paper"-channel model offers an information-theoretic framework for precoding techniques for canceling arbitrary interference known at the transmitter. It indicates that lossless precoding is theoretically possible at any signal-to-noise ratio (SNR), and thus dirty-paper coding may serve as a Basic Building Block in both single-user and multiuser communication systems. We design an end-to-end coding realization of a system materializing a significant portion of the promised gains. We employ multidimensional quantization based on trellis shaping at the transmitter. Coset decoding is implemented at the receiver using "virtual bits." Combined with iterative decoding of capacity-approaching codes we achieve an improvement of 2dB over the best scalar quantization scheme. Code design is done using the EXIT chart technique.

Yaopeng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • single molecular layer of silk nanoribbon as potential Basic Building Block of silk materials
    ACS Nano, 2018
    Co-Authors: Qianqian Niu, Qingfa Peng, Suna Fan, Huili Shao, Huihui Zhang, Benjamin S Hsiao, Yaopeng Zhang
    Abstract:

    In this study, nascent silk nanoribbons (SNRs) with an average thickness of 0.4 nm were extracted from natural silkworm silk by partially dissolving degummed silk (DS) in sodium hydroxide (NaOH)/urea solution at −12 °C. In this gentle treatment, the solvent could not destroy the nanofibrillar structure completely, but the chosen conditions would influence the dimensions of resulting SNRs. Molecular dynamics simulations of silk models indicated that the potential of mean force required to break hydrogen bonds between silk fibroin chains was 40% larger than that of van der Waals interactions between β-sheet layers, allowing the exfoliating treatment. It was found that the resulting SNRs contained a single β-sheet layer and amorphous silk fibroin molecules, which could be considered as the Basic Building Block of DS consisting of hierarchical structures. The demonstrated technique for extracting ultrathin SNRs having the height of a single β-sheet layer may provide a useful pathway for creating stronger and ...