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This study explores for the first time the use of the Evolutionary Kinetic Monte Carlo method (EKMC) to describe the etch rate anisotropy of quartz and three-dimensional microstructures and topography etched on Z-cut, AT-cut and BT-cut substrates using some mask patterns. Based on the evolutionary algorithm, the EKMC can properly transform the (facet specific) macroscopic etch rates of several crystal...
Dynamic spectrum access (DAS) is an efficient way to redistribute spare channels among users. Conventionally, dynamic spectrum access is conducted through (double) spectrum auction, where a third-party auctioneer collects bids from buyers and sellers, and determines the spectrum allocation. Rather than placing bids only on individual channels, combinatorial spectrum auction allows buyers to express...
We propose new support rod material in helix TWTs to improve the heat dissipation performance of the tubes, which is the cubic Boron Nitride (CBN) crystal with the second highest thermal conductivity and relatively low dielectric constant. The high frequency characteristics and the beam-wave interaction of helix slow wave structure with CBN and BeO support rods are simulated and analyzed, respectively...
In order to obtain the temperature distribution along inner helix of working TWTs, fiber Bragg grating array (FBGA) can be considered to be used in testing the temperature. Two testing methods based on FBGA embedded on/in support rod helix structure are proposed. The influence of the FBGA on beam-wave interaction is analyzed through CST. The results show that the structure with FBGA embedded in support...
Spectrums are heterogeneous, especially from the aspect of their central frequency. According to signal propagation properties, low-frequency spectrum generally has lower path loss, thus longer transmission range, compared with high-frequency spectrum. Cellular operators with different targeted cell size will have different preferences for spectrums with different frequencies. Furthermore, the transmission...
Femtocell refers to a new class of low-power, low-cost base stations (BSs) which can provide better coverage and improved voice/data Quality of Service (QoS). Hybrid access in two-tier macro-femto network is regarded as the most ideal access control mechanism to enhance overall network performance. But the implementation of hybrid access is hindered by a lack of market that can motivate ACcess Permission...
This paper discusses a method for chaotic time series prediction based on radial basis function (RBF) neural network. The number of input nodes for RBF is determined by embedding dimension based on chaotic phase-space reconstruction. Both Grassberger--Procaccia algorithm and Takens' method are employed to calculate minimal embedding dimension of chaotic time series. Finally, the prediction accuracy...
Combustion intermediate products in nitrogen-enriched intake air (NEA), such as CH2O and H2O2, are researched in this paper with chemical reaction kinetics software. Besides that, combustion of n-Heptane in NEA, different intake temperature and different rotate speed are researched. Nitrogen-enriched air combustion process in diesel engine is simulated with CAE software. The maximum temperature and...
A power-on-reset circuit of novel simple structure and high reliability is proposed. The circuit has been designed in 0.5 mum bipolar CMOS technology. The simulation was performed with 0.5 mum CSMC process model and Cadence Spectre and the results show that the circuit has a stable and reliable performance. With the differences of supply voltage's ramp rate, temperature and process, the change of...
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