Academic Publishers (academic + publisher)

Distribution by Scientific Domains
Engineering33%
Chemistry33%

Kinds of Academic Publishers

  • kluwer academic publisher
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    Selected Abstracts

    Modelling and design considerations on CML gates under high-current effects

    INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 6 2005
    M. Alioto
    Abstract In this paper, the effect of the transit time degradation of bipolar transistors on the power-delay trade-off in CML gates and their design is dealt with. A delay model which accounts for the transit time increase due to the high bias current values used in high-speed applications is derived by generalizing an approach previously proposed by the same authors (IEEE Trans. CAD 1999; 18(9):1369,1375; Model and Design of Bipolar and MOS Current,Mode Logic (CML, ECL and SCL Digital Circuits), Kluwer Academic Publisher: Dordrecht, 2005). The resulting closed-form delay expression is achieved by properly simplifying the SPICE model, and has an explicit dependence on the bias current which determines the power consumption of CML gates. Accordingly, the delay model is used to gain insight into the power-delay trade-off by considering the effect of the transit time degradation in high-speed designs. In particular, the cases where such effects can be neglected are identified, to better understand how the transit time degradation affects the performance of CML gates for current bipolar technologies. The proposed model has a simple and compact expression, thus it turns out to be suitable for pencil-and-paper evaluations, as well as fast timing analysis. Simulations of CML circuits with a 20-GHz bipolar process show that the model has a very good accuracy in a wide range of current and loading conditions. Copyright © 2005 John Wiley & Sons, Ltd. [source]

    Experimental and theoretical investigation of the high-pressure behavior of concrete

    INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Issue 1 2009
    Martin J. Schmidt
    Abstract The results of an experimental study aimed at characterizing the behavior of concrete for high confining pressures (up to 500,MPa) are reported. The main characteristics of the response under deviatoric conditions are quasi-linearity in the elastic regime, stress-path dependency, and gradual change from compressibility to dilatancy under increasing deviatoric stress. By performing the cyclic triaxial compression tests with several load,creep,unload and reload cycles, the time influence on the overall behavior was detected. Further, whether the main features of the observed behavior can be described within the framework of elastic/viscoplasticity theory was investigated. For this purpose, Cristescu's (Rock Rheology. Kluwer Academic Publishers: The Netherlands, 1989) approach was used. It was shown that the proposed elastic/viscoplastic model captures the main features of concrete behavior at high pressures. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    Sample geometry effects on incoherent small-angle scattering of light water

    JOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 1 2000
    F. Carsughi
    Light water is frequently used as a standard for calibrating small-angle neutron scattering (SANS) data. The intensities collected for 1 and 2,mm of light water in standard quartz cells may differ by up to about 50% due to the presence of multiple and inelastic scattering [Rennie & Heenan (1993). Proceedings of ISSI Meeting, Dubna, pp. 254,260, Report E3-93-65; Teixeira (1992). Structure and Dynamics of Strongly Interacting Colloids and Supramolecular Aggregates in Solution, edited by S. H. Chen, pp. 625,658. Dordrecht: Kluwer Academic Publishers]. Multiple scattering increases with the thickness of the sample. The use of only elastically scattered neutrons may lead to an absolute intensity of the SANS data of about a factor of 2 higher than that obtained by taking into account all of the neutrons on the detector [Ghosh & Rennie (1990). Inst. Phys. Conf. Ser.107, 233,244]. However, it is shown here that the scattering intensities collected with different ratios of sample-to-beam dimension do present large differences as a function of sample thickness. In particular, ratios smaller and larger than unity are considered and the results are discussed and compared with Monte Carlo simulations. [source]

    The Hard People: Rivalry, Sympathy and Social Structure in an Alpine Valley

    AMERICAN ETHNOLOGIST, Issue 2 2001
    Barbara Waldis
    The Hard People: Rivalry, Sympathy and Social Structure in an Alpine Valley. Patrick Heady. Amsterdam: Harwood Academic Publishers, 1999. xi. 248 pp., maps, photographs, bibliography, index. [source]

    UnstructuringChinese Society: The Fictions of Colonial Practice and the Changing Realities of "Land" in the New Territories of Hong Kong

    AMERICAN ETHNOLOGIST, Issue 2 2001
    Eve Darian-Smith
    UnstructuringChinese Society: The Fictions of Colonial Practice and the Changing Realities of "Land" in the New Territories of Hong Kong. Allen Chun. Amsterdam: Harwood Academic Publishers, 2000. xi. 348 pp., tables, map, bibliography, appendix, index. [source]

    Form factors for core electrons useful for the application of quantum crystallography (QCr) to organic molecules

    ACTA CRYSTALLOGRAPHICA SECTION A, Issue 4 2002
    Lulu Huang
    Form factors are calculated for the core electrons of the first-row atoms B, C, N, O and F. The form factors are presented in an analytical form, as appears in International Tables for X-ray Crystallography [Ibers & Hamilton (1974), Vol. IV, pp. 103,145. Birmingham: Kynoch Press; present distributor Kluwer Academic Publishers, Dordrecht]. Having such form factors for the core electrons reduces the number of parameters to be determined by the methods of quantum crystallography (QCr). It is shown that the form factors obtained are quite accurate. Thus, when they are used in QCr, they are expected to be consistent with accurate charge densities. [source]