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Wireless sensor network (WSN) can be widely used in many fields. Based on 0.18μm RF CMOS process, this paper presents a 4.8GHz 1V low phase noise LC voltage controlled oscillator (VCO) used in the frequency synthesizer for WSN applications. In order to work under 1V voltage, the LC VCO uses the structure of only one couple of NMOS differential negative resistances. The core circuit is biased by PMOS...
Preventing networks from being attacked has become a critical issue for network administrators and researchers. With the popularity and variety of large-scale zero-day threats over the Internet, security companies have to keep on inserting new virus signatures into their databases. However, the increasing size of virus signature file is dragging computers to a crawl during the virus scan. To effectively...
The electronic retrieval of ectomycorrhizae is regarded as researching object in this paper. And the ectomycorrhizal digital information retrieval system was designed by combining with Microsoft Visual Basic 6.0 Enterprise Edition database management system and Structure Query Language. The system realized electronic management and retrieval of local ectomycorrhizal information. In this software,...
As a source of electricity production, the level of automation in thermal power units is increasing higher and higher due to the construction of smart power grids. The units in grids should be working in automatic generation control and primary frequency. The optimal control has changed to a hot spot in the industry. A new method for optimal control which is used by an external optimization controller...
Nanocomposite dielectrics hold a promising future for the next generation of insulation materials because of their excellent physical, chemical, and dielectric properties. In the presented study, we investigate the use of plasma processing technology to further enhance the dielectric performance of epoxy resin/SiO2 nanocomposite materials. The SiO2 nanoparticles are treated with atmospheric-pressure...
As one of important cloud detecting means, millimeter-wave cloud radar has been given more and more attention and research. This thesis mainly summarizes and analyzes the technical features and detecting capabilities of millimeter-wave cloud radar, and it describes the data applications of millimeter-wave cloud radar which contain researches of cloud structure features and analyses of typical weather...
In order to ensure the enterprises can acquire the changes of the market at any time, thenadjust the strategies quickly, the state information of business process execution can reflect the situation best. If the status in a process model can be defined clearly, you can monitor the execution information of the process which is based on the processes run-time implementationquickly, andchange the process...
Wireless sensor networks are distinguished from traditional networks. Existing routing algorithms are not effective in supporting such networks. In this paper, a novel quantum-inspired ant-based routing (QABR) algorithm for WSNs is proposed, and it has rapid convergence and good global search ability. Experiment results show that the proposed algorithm can find rapidly the optimal path from source...
In order to solve the transformation problem of BOM from engineering BOM to maintenance BOM for MRO system (MRO, Maintenance, Repair and Overhaul), a formal transformation model of BOM view is established. In this model, the intermediate component, inherit component, virtual component are defined on the specific maintenance management domain, and the transformation process from engineering BOM to...
A radiated disturbance measurement is an important EMC test. However, it is difficult to measure a highly-directive radiated disturbance accurately. Current methods and software can't resolve this problem very well. Therefore a novel and accurate approach is presented in this paper: the scanning area of the radiated disturbance measurement was divided into units and a process called “double-scan”...
Social Force model is a dynamic model used to the simulation of crowd behaviors. The Social Force model explains the formation of self-organization from the dynamic. In this paper, a new Swarm Optimization algorithm based on Social Force model (SFSO) is proposed. The SFSO algorithm is a population based optimization technique which is inspired from the behaviors of pedestrian. In SFSO algorithm, the...
This paper investigates the thermal characteristics of the transverse flux tubular linear machine (TFTLM) for electromagnetic launcher (EML), including numerical calculation and temperature rise in the short-time overload test. Firstly, it estimates the various components of heat sources i.e. electromagnetic losses, including core loss in the stator as well as copper loss and eddy-current losses in...
This paper presents a dynamic model for quadrupole six-phase electrical excitation synchronous wind power system. Capacitor charge-discharge process is taken into consideration, as well as transmission chain speed conversion and generator electromagnetic transformation. Based on PI control principle, controllers dynamic model is established to keep DC voltage constant and realize the maximum power...
An improved tracking differentiator(ITD) is proposed for processing the signal with noise. Tracking differentiator(TD) is a kind of low-pass filter utilized in many industrial control systems for its advantages: simple structure, model-independence, and so on. TD not only has the function of filtering the signal, but also can provide derivatives of the signal at the same time. Like most low-pass filter,...
We demonstrated a femtosecond fiber laser directly delivering high power diffraction-resistant wavepacket. Bessel-Gauss reshaping was obtained by an integrated shaper fabricated on fiber-end by focused ion beam combined with a spherical lens.
Based on the finite element method, an electromechanical impedance (EMI) model for a damaged plate with imperfectly bonded piezoelectric patches is established in the paper. The property of bonding layer between the PZT sensor/actuators and the host plate is taken into account based on the peel stress model as well as the shear lag model. The damage appearing in the plate is modeled by a change in...
With higher frequency and miniaturization of piezoelectric resonators, many nonlinear phenomena such as derive level dependency (DLD) and activity dip have emerged and needed to be systematically studied. Our earlier studies shown neither kinematic nor material nonlinearities are the main factors of frequency shifts and performance fluctuation of quartz crystal resonator. With the consideration of...
As a non-invasive technique applied for the functional mapping of human brain, Magnetoencephalography (MEG) can acquire the neural activity with high temporal resolution and moderate spatial resolution. However, when reading a MEG record, for research or clinical reference, the investigator face the signals from non-cerebral sources like eye movements, heart beat and muscle activity always appear...
In this paper, differential VLBI (Δ VLBI) model used for Chang'e-1 (CE-1) Transfer Orbit positioning is derived Based on the model, error equation of observations is formed and coefficient matrix A is designed Finally the influence of predicted accuracy of ERPs on CE-1 positioning accuracy is analyzed and some results are given
In this paper, a relativistic differential VLBI (Δ VLBI) mathematical model for Chang'e-1(CE-1) Transfer orbit is derived Based on the model, Δ VLBI time delay observations are formed by differencing CE-1 time delay observations with a simulated radio source time delay observations. Then the error equation of observations is formed and the unknown parameters including orbit of CE-1 and Earth Orientation...
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