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In this study, the process technology of contact-etching stop-layer (CESL) with LPCVD or PECVD is performed by interlayer-dielectric-SiNx stressing layer to form the tensile or compressive strained n/p MOSFETs. Because the strain effect on MOSFET devices is finite, the promoting performance of source/drain current is increased more while the channel lengths of the devices are decreased more. This...
A novel CNT/SiC/epoxy composite was proposed and demonstrated as adhesive joining element and heat dissipation media for HB-LEDs. Junction temperature, luminous intensity and forward voltage were measured for varied combinations in the composites. The experimental results showed that the epoxy with 30 wt% of SiC and 5 wt% of MWCNTs had the best thermal properties. Comparing to commercial epoxy, the...
In this paper, a novel dual-mode pulse-triggered FF design supporting functional versatility is presented. A dual-mode pulse generator design in pass transistor logic (PTL) is devised first. The threshold voltage loss problem common in PTL design is successfully resolved while the circuit simplicity is kept. By combining the pulse generator with a level sensitive latch, a dual-mode pulse-triggered...
Studying on the eluting and adsorpting the saturated ANJ.SiC by different regenerants, NaOH is the most suitable one. The influence of the factors containing NaOH concentration, elution time and regeneration times on ANJ.SiC regeneration rate was studied. The results show that the best NaOH concentration is 0.5mol/L, with the regeneration rate of 115.83%; the best elution time is 60min, with the regeneration...
With the rapid development of domestic airport industry, the construction and operation scale of the major large-scale airports have ranked the top ones worldwide, but big gaps still exists compared to global air hubs. Study on route network from the perspective of the airport could provide theoretical support for the construction of air hubs; what's more, it is also the need for China to transit...
On the base of Qi system, a novel hyper-chaotic system is obtained by adding a linear feedback control. By analyzing the equilibrium, the system has rich and complex dynamical behaviors. Although this new system has only one equilibrium, it is four-wing hyper-chaotic attractor. The system is also verified to have a four-wing hyper-chaotic attractor by Lyapunov exponents, bifurcation diagrams, poincaré...
A recent trend in the research of ROM-less DDFS architecture, which is endowed with high speed, low power and high SFDR features and will generate the sine or cosine waveforms within a broad frequency range. In this work one high-speed, low-power, and low-latency pipelined ROM-less DDFS has been proposed and implemented in Xilinx Virtex-II Pro FPGA. The proposed ROM-less DDFS design has 32 bit phase...
In this paper, we propose a simple time-domain replica correlation (TDRC) based symbol timing synchronization scheme in orthogonal frequency division multiplexing systems. By allocating a locally concatenated sequence of a base sequence and its modified sequence to total feasible frequency resources, we can achieve both hardware complexity and frequency offset reductions. The hardware complexity of...
We analyze circumferentially circulating mechanical whispering-gallery modes [WGM] resonating in a micron scaled silica sphere. We recently showed that such modes can be excited optically. A variety of modes are calculated in which the deformation is polar, radial or azimuthal. Additionally, we calculate Rayleigh WGMs for which points on the surface follow a circular path.
We have developed a novel fabrication process which integrates silicon MEMS actuators with silica optical components. Suspended silica optical waveguides are actuated by a silicon electrostatic comb drive actuator, with a maximum displacement of 8 μm at 35 V bias.
In this paper, we propose a translation-based approach for performance prediction of composite service built on WS-CDL. To translate a composite service into a state-transition model for quantitative analysis, we first give a set of translation rules to map WS-CDL elements into general-stochastic-petri-nets (GSPN). Based on the GSPN representation, we introduce the prediction algorithm to calculate...
Based on the semiconductor heterojunction theory and three-layer model of Si-SiO2, the expressions of electroluminescence intensity ratio of interface layer to silicon core were deduced. The result can explain the low electroluminescence efficiency and the phenomenon of multi electroluminescence peak of nano-porous oxidized silicon well. Simulation results show that: 1) ΔE has a great influence on...
In this paper, the notion of multiresolution matrix-valued multiresolution analysis is introduced. A method for constructing biorthogonal multiple vector-valued multivariate wavelet wraps is put forward and their properties are investigated by means of time-frequency analysis method, matrix theory and operator theory. Three biorthogonality formulas concerning these wavelet packets are obtained. Finally,...
The temperature dependence of field emission properties of silicon carbide (SiC) nanowires was studied in a range from 27°C to 300°C by using transparent anode technique. The SiC nanowires of diameter of around 15 nm were grown on silicon carbide substrate by thermal heating using iron as catalyst. The results show that above a threshold temperature, the field emission current increases significantly...
A new fabrication method of SiC field emitter arrays has been developed. The new method involves the formation of three-dimensional silicon dioxide masks, dry etching, and tip sharpening. The field emitter arrays were successfully fabricated on 4H-SiC substrates with tip diameter less than 10 nm.
According to a cautious estimate, approximately 10% of the energy available at the crankshaft in a diesel operated vehicle is used for operating the compressor of the vehicle's air-conditioning system. This is a huge loss if one takes into account the fact that the thermal efficiencies of most diesel operated vehicles range from 20-30% when in pristine condition. The bottom line is that a great deal...
This paper reports the extraction of soluble silicates and aluminates from coal fly ash using microwave irradiation from a domestic microwave oven. Fifteen experimental conditions for the extraction were obtained using Box-Behnken design through manipulation of three variables namely sodium hydroxide (NaOH) concentration, power level of microwave irradiation and exposure time; each variable has three...
A problem that occurs in texture analysis and quantitative analysis of magnetic resonance imaging (MRI), is that the extracted results are not comparable between consecutive or repeated scans or, within the same scan, between different anatomic regions. The reason is that there are intra-scan and inter-scan image intensity variations due to the MRI instrumentation. Therefore, image intensity normalization...
This paper describes a methodology for checking formal properties with local variables expressed in SystemVerilog assertions. Given a behavioral design in SystemVerilog and a property with local variables, the technique uses automated directed searching to reveal all possible control-paths of the given design and tests the satisfaction of the property symbolically in the corresponding data-path operations...
To gain knowledge about the transduction mechanisms involved in the sensitivity of field effect gas sensors towards non-hydrogen containing substances, such as O2, NO and CO, the sensor signal characteristics during exposure of some conceptually different model sensors to these as well as hydrogen containing gases have been investigated. The MOS capacitor based model sensors employ different combinations...
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