摘要：
Function approximation accuracy and computational cost are two major issues in approximation-based adaptive fuzzy control. In this paper, a model reference composite learning fuzzy control (MRCLFC) strategy is proposed for a class of affine nonlinear systems with functional uncertainties. In the MRCLFC, a modified modelling error that utilizes data recorded online is defined as the prediction error, a linear filter is applied to estimate the derivatives of plant states, and both the tracking error and the prediction error are exploited to update parametric estimates. It is proven that the closed-loop system achieves semiglobal practical exponential stability by an interval-excitation condition which is much weaker than a persistent-excitation condition. The proposed strategy can guarantee accurate function approximation under greatly reduced computational cost. The effectiveness of the proposed MRCLFC strategy has been verified by applying it to an control problem of aircraft wing rock.
摘要：
The formation of infrared solitons in graphene under Raman excitation is investigated using density-matrix approach. We find that the unique band structure and selection rules for the optical transitions near the Dirac point can result in extremely strong optical nonlinearity. Theoretical investigations with the aid of slowly varying envelope approximation and perturbation theory clearly indicate the existence of bright and dark solitons in Landau-quantized graphene. Actually, the formation of spatial soliton in such a material is the consequence of the balance between nonlinear effects and the dispersion properties. Also, the corresponding carrier frequency is tunable in the infrared range. These results can make us know better the crossover between optical solitons and graphene metamaterials. The predicted nonlinear optical effect in graphene may provide a new possibility for designing high-fidelity graphene-based information processing device.
摘要：
The microbolometric exact theoretical output responsivity expression for a focal plane array is obtained for the first time. Based on the physical thermal model for a microbolometer, the temperature change behavior of the microbolometer is analyzed and discussed to get its theoretical temperature change expression under pulse voltage bias. With the temperature change expression and infrared response analysis of the microbolometer, the theoretical output responsivity expression is successfully derived. The theoretical responsivity expression reveals some key factors that affect and determine the infrared sensibility of the microbolometric array, which can be utilized to guide the design optimization for a microbolometric focal plane array. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
会议论文集名称：
IEEE International Conference on Emerging Technologies and Factory Automation-ETFA
摘要：
In all the processes of Wind Energy (WE) utilization , the Wind Power (WP) assessment is critical stage for all the Wind Farms (WFs). This paper is focused on the WE systems in Luxembourg. It describes the overview of the wind resources in all the WFs and presents an Unified Cooperation Wake Model (UCWM) and Coordination and Optimization Control (CnOC) for WFs. Based on WP assessment of WFs, the statistical method is used to model the distribution of wind speed and Wind Direction (WD). Some simulation figures about the wind rose and Weibull distribution demonstrate the detailed description and assessment of WP. These assessments are expected to enhance the effectiveness of WP exploitation and utilization in WFs of Luxembourg.
会议论文集名称：
International Conference on Wavelet Analysis and Pattern Recognition
关键词：
GPR;step system;minimum transmission delay
摘要：
When GPR is used for sub-bottom survey, the echo signal not only contains very high frequency, but also lasts for only several nanoseconds. These are the two difficulties in GPR signal sampling. Meanwhile, the step system which is responsible for the data sampling has an inherent minimum transmission delay. This delay will cause the failure of data collecting. In this paper, a new type of step system which is based on cascaded AD9500 is presented. This step system can realize high resolution of 0.0125ns, it can also counteract the influence of minimum transmission delay. This method can realize adaptivity to all GPR sampling systems through setting up parameters. The experimental results show the step system can remove the minimum transmission delay and realize high resolution detection.
关键词：
Silicon;Silicon carbide;Quantum Dots;Bonding Configuration;Crystallization Mechanism;Plasma-Enhanced Chemical Vapor Deposition;Transmission Electron Microscopy
摘要：
We have investigated the crystallization process of silicon quantum dots (QDs) imbedded in hydrogenated amorphous Si-rich silicon carbide (a-SiC:H) films. Analysis reveals that crystallization of silicon QDs upon thermal annealing of the samples can be explained in terms of bonding configuration and evolution of microstructure. The precursor gases were dissociated via electron impact reactions in the plasma-enhanced chemical vapor deposition, where the hydrogenated silicon radicals and reactive SiHn species lead to the formation of primary Si nuclei. With increasing annealing temperature, the breaking of SiHn bonds and decomposition of Si-rich SiC were progressively enhanced, allowing the formation of crystalline silicon QDs inside the a-SiC:H matrix. The results help clarify a probable mechanism for the growth of silicon QDs and provide the possibility to optimize the microstructure of silicon QDs in a-SiC:H films.
摘要：
This paper describes a non-uniformity compensating method for microbolometric focal plane array. Through the analysis of the basic principle of conventional non-uniformity compensating methods for microbolometric focal plane array, we have pointed out their common fatal limitation unable to compensate the nonlinear non-uniformity of microbolometer array. Based on our previous constant power optimized bias, a novel and simple nonlinear non-uniformity compensating method for microbolometric focal plane array is proposed in this paper. The proposed compensating method is simply configured and can easily and effectively be utilized to compensate the nonlinear non-uniformity of microbolometer array. (C) 2014 Elsevier GmbH. All rights reserved.
