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The issue of PM2.5 is becoming a popular atmospheric research hotpot recently. This particular paper evaluates the era reasons as well as influencing factors associated with PM2.5 based on the information associated with PM2.5 in Xing Tai (2014. 01. 01 - 2014. 04. 26), and builds the actual era as well as evolution mode of PM2.5 in Xing Tai by utilizing evolutionary algorithms formula and BP neuron...
An inverter arranged in the photovoltaic generating system is required to be with higher working efficiency and lower degree of distortion on waveform. In this thesis, mathematic model of inverter has been given out through an analysis using the structure of two-level inverter, and then put forward a traditional PID control in combination with rerunning control for output waveform from an inverter...
Based on existing power line structures of multi-path transmission channel model and taking the measured data of practical low voltage power-line communication channel magnitude of the frequency response within the range form 0.5MHz to 20MHz as samples, The particle swarm optimization algorithm of self-adaptive parameter based on ant colony algorithm (AS-PSO) is applied to the multi-parameter identification...
With the increasing numbers of Web services and service users on World Wide Web, predicting QoS(Quality of Service) for users will greatly aid service selection and discovery. Due to the different backgrounds and experiences of users, they have different QoS experiences when interacting with the same service. Even two users who have similar experiences on some services can have diverging views when...
Image edge detection plays an important role in the image processing, On the basis of studying mathematical morphology and morphological edge detection operator in the field of application of edge detection in depth and integrating morphological expansion and corrosion, an amended edge detection operator was proposed and used to detect the image edge. Then change the edge elements structure and scale...
The traditional rules to classify and subdivide map were broken, and a new method of map data generation and management was put forward in this paper, based on Pyramid Model and Quad Tree Model, according to the characteristic of data scheduling in network environment. Also the procession flow to get Quad Tree map data using standard map sheet data, non-standard map sheet data or Quad Tree map data...
Based on the Navier-Stokes equations for viscous, incompressible fluid and VOF method, the numerical experiment platform of oil containment by rigid floating boom in wave is established, utilizing the commercial CFD software FLUENT, and the waves are generated by defining the velocity of water particle on the inlet boundary. The volume of fluid (VOF) model is used to distinguish the three immiscible...
The temperature and voltage fluctuation characteristics of pressure sensor was analyzed and found that the sensor output is nonlinear and easy to be affected by temperature and voltage fluctuation over a wide measuring range, a correction model of pressure sensor based on Support Vector Machine was presented. The approximate ability of the SVM to any nonlinear function was utilized to drill the correction...
Functions of moments that are invariant under geometric transformations are useful for image analysis and pattern recognition. The basic model of computer vision is projective transformation. Yet it is known that moment invariants for general projective transformations do not exist. This paper presents a novel method to derive moment invariants under restricted projective transformations. The form...
Aiming at the neglected selection for non-critical task in parallel structure, this paper provides a method of services selection based on grey relational analysis. It regards the execution time of critical task as the upper limit for the execution time of non-critical task, uses the execution time of non-critical task as the reference series, and takes other QoS criteria as compared series. And the...
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