Journal of Anhui University
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Interference energy detection is the foundation for the algorithm of interference suppression.General energy detection algorithm is simple and easy to be implemented,but the performance is easily influenced by the uncertainty of the background noise.An adaptive frequency domain energy detection algorithm which was based on frequency domain interference suppression algorithm model was presented in this paper.This algorithm set the threshold of signal through estimating the background noise power,...
For the shortcoming that C-OWGA operator can only assemble single interval data,this paper proposed a new class of continuous interval data assembled operator. We constructed an IGOWC-OWGA operator by introducing IGOWA operator on the basis of the C-OWGA operator,then we selected vectorial angle cosine as a correlation index and built a new type of continuous interval combination forecasting model.Finally,it is shown that the new method had a significant effect in improving forecasting accuracy ...
#1Chen Ju (Shanghai Maritime University)
Independent component analysis(ICA)has been applied to the analysis of functional magnetic resonance imaging(fMRI)data.Although it holds the promise of being a data-driven analysis,we should determine the number of independent components prior to performing ICA.Accurate estimation of the number of independent components in fMRI data is critical to reduce overfitting or underfitting.Several approaches based on information theoretic criteria(ITC)have been implemented in widely used ICA,but they of...
With the wide application of fractional differential system theory in the field of physics,control,etc.,fractional degenerate differential equations have become an important topic in the field of the fractional differential equation.In this paper,the transformation problem and the explicit representation of solution were considered for fractional degradation delay differential equations with non-square matrix.By using the generalized inverse matrix theory,sufficient and necessary conditions that...
Magnetic mesoporous silica nanoparticles(MMSNs)were prepared via a simple solgel process with tetraethyl orthosilicate as raw material and Fe3O4 nanoparticles as core.Then chitosan was modified to the magnetic mesoporous silica nanoparticles through the interaction between the carboxyl on magnetic mesoporous silica nanoparticles and the amino of chitosan(CS)to get chitosan coated magnetic mesoporous silica nanoparticles(MMSNs/CS).Fourier transform infrared(FT-IR),X-ray diffraction(XRD),transmiss...
Remote sensing images obtained by satellite sensors are often covered with noise of clouds which result from the impact of climate.A thin cloud removal algorithm based on dual-tree complex wavelet transform was proposed in this paper.Remote sensing image covered with clouds was decomposed into high and low frequency components by using this transformation firstly.Then the high frequency components were compensated and the low frequency components were suppressed.The thin cloud on remote sensing ...
Well-dispersed uniform hard magnetic CoFe_2O_4 nanoparticles were synthesized by thermal decomposition of a metal-organic salt.Then they were reduced in H_2 ambient at low temperature to prepare hard CoFe_2O_4/soft CoFe_2 composites in order to weaken as possibly the agglomeration.The improved magnetic performances were obtained in this work:a higher remanence to saturation magnetization ratio Mr/Msvalue of 0.64 was obtained;with increasing the reducing time the Msvalue greatly increases to 124e...
Projector calibration is one of the key technologies in computer vision.This paper presented a calibration method of projector based on the positional relationship between the camera and projector. The method established the relation which was one to one correspondence of pixels between the image of the camera and projector image.The projector calibration was completed when getting homography between the projected image and the camera image by a series of operations to the captured image such as...
VO_2(A)nanorods were facilely synthesized by using V_2O_5 and oxalic acid as the starting materials via a hydrothermal method.The initial molar ratio of V_2O_5 to oxalic acid and reaction time were changed to obtain the pure VO_2(A)phase. The elemental composition,microstructures and optical properties of as-obtained VO_2 samples were characterized using X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),scanning electron microscope(SEM),differential scanning calorimetry(DSC)and Fourie...
In this paper,mesoporous NiWO_4 nanospheres with chestnut-like shapes were synthesized by hydrothermal method without any additives at a relatively low temperature.The structure was characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR)and the morphology was detected with scanning electron microscopy(SEM).The possible formation mechanism was discussed on the basis of the morphologies of NiWO_4 at different time intervals.In addition,it has been found that the morp...
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