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False data injection attack can bypass the bad data defense process in the power systems and affect the results of state estimation, so that the system security is in danger because of the wrong states obtained in the dispatch center. The traditional false data injection attack is based on the DC power flow model and has many limitations. In this paper, a global attack model and local attack model...
Electronic jamming is the key technology of electronic countermeasure, for which models and simulations are studied on noise jamming, deception jamming, and chaff jamming. In the noise jamming, the simulation analysis of radio frequency noise jamming is conducted and the theoretical models of other forms of noise jamming are built. The simulation analysis of range-gate pull off (RGPO) is carried out...
This study primarily discusses the recommended membrane properties and potential usages of membrane systems for hydrogen purification and pre-combustion CO2 capture. Single-stage and two-stage systems for CO2 selective membranes (CSMs) and H2 selective membranes (HSMs) are investigated. To achieve the different goals for hydrogen purification, determining the possible operating range for different...
In this paper, an TSV (Through-Silicon Via) Interposer with signal distribution networks (SDN) and power distribution networks (PDN) is proposed. And the temperature-dependent electrical resistivity of conductors and the Joule heating effect of the interposer are analyzed using the electrical-thermal co-simulation method. The simulation results show that the temperature effect on IR (voltage) drop...
With problems of environmental pollution and energy crisis, because of the advantages of zero emissions and low noise level, electrical vehicles (EV) are gaining more and more attention. Large number of EVs connected to power systems for charging will have significant impact on power system, especially massive uncontrolled charging will cause bottlenecks in supplying capacity and expose power system...
With large offshore wind farms connecting to the grid by VSC-HVDC, many urgent problems should be solved, such as Available Transfer Capability (ATC) calculation, which has important academic and practical significances to transmission system operation. A new ATC computation model with offshore wind farms connecting to the grid via VSC-HVDC is proposed in this paper. In this model the characteristics...
In this paper, it is discussed from the aspects of the operation requirements in Microgrid and the control methods in power system, focusing on the idea of how to make the inverter imitate the output characteristics of the synchronous generator. The fundamental difference between Microgrid and the power grid lies in the hardware interface, one is the inverter, the other is synchronous generator. Analyzing...
Two dimentional mathematical model of tunnel temperature field in condition of diffusion during seam smoldering steady according to heat transfer theory and comservation of mass, momentum and energy. Temperature character of tunnel in condition of diffusion during seam smoldering steady is simulated by COMSOL Multiphysics according to this model. Results show that temperature field in tunnel can be...
Interaction process of condensation shock and aerodynamic shock in superheated steam flow and nucleation flow with different exit Mach number was numerically studied. The model was implemented within a full N-S viscous flow solution procedure, and the process of condensation was calculated by the quadrature method of moments. Numerical schlieren photography was performed to show the shock wave distribution...
Many effective automatic surface simplification algorithms have been developed in order to produce approximations from a complex polygonal model. However, previous algorithms often have difficulty identifying and preserving important geometric features such as high-curvature regions when the model is simplified to a very low level of detail. In this paper, we define a new feature constraint quadric...
Hundreds of thousands of lives were lost in the natural disasters such as geological earthquakes, floods, landslides and mud-rock flow in every year. Nowadays, with the rapid development in airborne LiDAR techniques, extraction of the multi-scale topographical features from high-resolution topographic data acquired via airborne LiDAR would lead to fundamentally new understandings of earth essential...
The mechanism of a floating ring in the floating ring bearing system is investigated. Based on Hirs' bulk flow theory, Moody's frication factor equation and generalized incompressible Reynolds Equation, considering the elastic deformation and the whirling motion of the floating ring, the model and the governing equation of the floating ring bearing under the turbulence state were set up. The result...
A neural architecture is introduced for how visual cortical areas V1 and V2 implement context-sensitive binding processes as attention modulation and cross-stream interaction. The present architecture based on LAMINART and FACADE theory shows how layered circuits in cortex areas enable feedforward, horizontal, feedback interactions and intractions to complete attention-modulated perceptual grouping...
A new method was put forward to measure the errors of bevel gear and corresponding measure device was invented. The measure gear was made by pasting the metal silks on the teeth. The advantage of the device was the error (including tangential composite error, tangential tooth-to-tooth composite error, radial composite error, total cumulative pitch error and total alignment error et al) can be measured...
Considering the resource-constraint metrics in sensor networks, it is necessary to develop the energy-efficient techniques to save the limited power while applying the security and privacy protection mechanisms during the data transmission. In this paper, we propose to define the probabilistic lifetime model of a single sensor node to measure the energy-efficient solutions towards the privacy-aware...
Accounting for spectral hole burning, carrier heating and carrier density modulation, we investigate the wavelength dependence of the linewidth enhancement factor in semiconductor optical amplifiers excited by picosecond pump pulse.
Inverted pendulum is one of the most important plants to be researched to investigate the validity of various control strategies, it's a highly nonlinear, unstable system. In this paper, the friction force and viscous moment are considered in the modeling of the plant, the sliding mode control method is applied to the design of the control system of inverted pendulum, both traditional sliding mode...
In order to test the influencing factors of FDI in Chinese Services, Johanson co-integration test, Granger causality test and error correction model are used in this paper by analyzing the data from 1985 to 2007. The research shows that economic development, services development, FDI in the secondary industry and the improvement of government service efficiency in long run have positive effect on...
This paper presents a comprehensive semiconductor optical device (SOD) simulation tool produced by object-oriented programming (OOP). First, the SOD is assumed to be composed of the elementary cell which is abstracted from semiconductor optical amplifiers. Meanwhile, some auxiliary classes and inheritance hierarchies are defined. Besides, the numerical and transaction algorithms with high performance...
A method for controlling homogeneous nucleation and reducing degree of flow separation in high-speed transonic wet steam flow is presented. The spontaneous nucleation flow in a turbine cascade was numerically studied. The model was implemented within a full Navier-Stokes viscous flow solution procedure, and the process of condensation was calculated by the quadrature method of moments which show good...
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