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排序方式: 共有94条查询结果,搜索用时 15 毫秒
1.
Azizli Mohammad Javad Barghamadi Mohammad Rezaeeparto Katayoon Mokhtary Masoud Parham Somayeh Darabi Mehdi Joker 《Iranian Polymer Journal》2021,30(10):1001-1018
Iranian Polymer Journal - Effects of graphene oxide (GO) on various properties of rubber hybrid nanocomposites based on PVMQ/XNBR-g-GMA/XNBR (phenyl-vinyl-methyl-polysiloxane/carboxylated nitrile... 相似文献
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Blom S. Darabi S. Huisman M. Safari M. 《International Journal on Software Tools for Technology Transfer (STTT)》2021,23(5):741-763
International Journal on Software Tools for Technology Transfer - A commonly used approach to develop deterministic parallel programs is to augment a sequential program with compiler directives... 相似文献
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Analysis and Optimization of Current-Driven Passive Mixers in Narrowband Direct-Conversion Receivers 总被引:1,自引:0,他引:1
Mirzaei A. Darabi H. Leete J.C. Xinyu Chen Juan K. Yazdi A. 《Solid-State Circuits, IEEE Journal of》2009,44(10):2678-2688
Properties of the current-driven passive mixer are explored to maximize its performance in a zero-IF receiver. Since there is no reverse isolation between the RF and baseband sides of the mixer, the mixer reflects the baseband impedance to the RF and vice versa through simple frequency shifting. It is also shown that in an IQ down-conversion system the lack of reverse isolation causes a mutual interaction between the two quadrature mixers, which results in different high- and low-side conversion gains, and unexpected IIP2 and IIP3 values. With a thorough and accurate mathematical analysis it is shown how to design this mixer and its current buffer, and how to size components to get the best linearity, conversion gain and noise figure while alleviating the IQ cross-talk problem. 相似文献
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Mergen H. Ghayesh Farbod Alijani Mohammad A. Darabi 《Journal of Mechanical Science and Technology》2011,25(8):1915-1923
The aim of this study is to develop an approximate analytic solution for nonlinear dynamic response of a simply-supported
Kelvin-Voigt viscoelastic beam with an attached heavy intra-span mass. A geometric nonlinearity due to midplane stretching
is considered and Newton’s second law of motion along with Kelvin-Voigt rheological model, which is a two-parameter energy
dissipation model, are employed to derive the nonlinear equations of motion. The method of multiple timescales is applied
directly to the governing equations of motion, and nonlinear natural frequencies and vibration responses of the system are
obtained analytically. Regarding the resonance case, the limit-cycle of the response is formulated analytically. A parametric
study is conducted in order to highlight the influences of the system parameters. The main objective is to examine how the
vibration response of a plain (i.e. without additional adornment) beam is modified by the presence of a heavy mass, attached
somewhere along the beam length. 相似文献
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Pirooz Darabi Tingwen Li Konstantin Pougatch Martha Salcudean Dana Grecov 《Chemical engineering science》2010,65(15):4472-4483
A simplified mathematical model and numerical simulations of the governing Navier–Stokes equations are used to predict the shape evolution, rupture distance, and liquid distribution of stretching pendular liquid bridges between two equal-sized spherical solid particles. In the simplified model, the bridge shape is approximated with a parabola, and it is assumed that the surface tension effects dominate the viscous, inertial, and gravitational effects. For the numerical simulations, a commercial Computational Fluid Dynamics (CFD) software package – FLUENT – is used. The rupture distance predictions obtained with both models are compared with experimental data and a reasonable agreement is found. The results of the numerical investigations show that for simulations with negligible viscous, inertial, and gravitational effects, the rupture distance approaches an asymptotic value, which is close to the value predicted by the simplified model. The bridge profiles predicted using the simplified model and the numerical simulation are compared. It is found that a second-order polynomial appropriately represents the stable bridge shape for particles with identical contact angles; however, for liquid bridges between particles with different contact angles, the numerical simulations of the governing Navier–Stokes equations should be used. 相似文献
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John F. Rushing Masoud K. Darabi Eisa Rahmani Dallas N. Little 《International Journal of Pavement Engineering》2017,18(2):138-159
This study presents the rutting performance results of full-scale pavement test sections subjected to F-15E and C-17 aircraft wheels at two different temperatures. Pavement structures for the tests were constructed under shelter in the U.S. Army Engineer Research and Development Center's (ERDC) pavement test facility. The full-scale test results are used to validate viscoelastic, viscoplastic and hardening-relaxation constitutive relationships implemented in the Pavement Analysis Using Nonlinear Damage Approach (PANDA) model. PANDA is a mechanistic-based model which incorporates nonlinear viscoelastic, viscoplastic, hardening-relaxation, viscodamage, moisture-induced damage and ageing constitutive relationships. Results of dynamic modulus and different repeated creep-recovery laboratory tests are analysed to extract the parameters associated with viscoelastic, viscoplastic and hardening-relaxation constitutive relationships implemented in PANDA. Once calibrated, PANDA is used to predict the rutting performance observed in full-scale pavement test sections. The simulation results illustrate that PANDA is capable of predicting the rutting of airfield pavements subjected to heavy aircraft wheel loads at intermediate and high temperatures. It is shown that PANDA successfully predicts the effect of shear flow and upheaval at the edges of the wheel. The data from simulation suggested that PANDA, once calibrated, can provide insight into the critical locations of tensile and compressive stresses within the pavement structure. PANDA simulations not only provide a tool for evaluating existing structures, but also can be used in designing more sustainable pavement structures and materials. 相似文献
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A. Kheyri Z. Nourbakhsh E. Darabi 《Journal of Superconductivity and Novel Magnetism》2016,29(4):985-993
The structural, electronic, and magnetic properties of pure graphene sheet and graphene sheet with Fe, Co, Si, and Ge impurities are investigated. The calculated results are done within density functional theory in the presence of spin-orbit coupling using the generalized gradient approximation. Electron density of states, band order, electron charge distribution, magnetic moment of these sheets, and the effect of pressure on the band order of graphene sheet with Fe impurity are investigated. 相似文献