We present a novel quantization-based digital audio watermarking scheme in wavelet domain. By quantizing a host audio’s wavelet coefficients (Integer Lifting Wavelet Transform) and utilizing the characteristics of hu...We present a novel quantization-based digital audio watermarking scheme in wavelet domain. By quantizing a host audio’s wavelet coefficients (Integer Lifting Wavelet Transform) and utilizing the characteristics of human auditory system (HAS), the gray image is embedded using our watermarking method. Experimental results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as noising adding, lossy compression, low pass filtering, re-sampling, and re-quantifying.展开更多
We study an approach to constructing multiple soliton solutions of the (3+1)-dimensional nonlinear evolution equation. We take the (3+1)-dimensional potential- YTSF equation as an example. Using the extended homogeneo...We study an approach to constructing multiple soliton solutions of the (3+1)-dimensional nonlinear evolution equation. We take the (3+1)-dimensional potential- YTSF equation as an example. Using the extended homogeneous balance method, one can find a Backlund transformation to decompose the (3+1)-dimensional potential-YTSF equation into a set of partial differential equations. Starting from these partial differential equations, some multiple soliton solutions for the (3+1)-dimensional potential-YTSF equation are obtained by introducing a class of formal solutions.展开更多
By the application of the extended homogeneous balance method, we derive an auto-Bācklund transformation (BT) for (2＋1)-dimensional variable coefficient generalized KP equations. Based on the BT, in which there are ...By the application of the extended homogeneous balance method, we derive an auto-Bācklund transformation (BT) for (2＋1)-dimensional variable coefficient generalized KP equations. Based on the BT, in which there are two homogeneity equations to be solved, we obtain some exact solutions containing single solitary waves.展开更多
The pure phases of alkaline earth molybdates MMoO 4, where M=Mg, Ca, Sr or Ba, were synthesized via the calcination of the related citrato oxomolybdate complexes. The mixed metal oxides can be highly dispersed at the ...The pure phases of alkaline earth molybdates MMoO 4, where M=Mg, Ca, Sr or Ba, were synthesized via the calcination of the related citrato oxomolybdate complexes. The mixed metal oxides can be highly dispersed at the atomic level due to the existence of uniform citrato oxomolybdenum precursors in definite composition. The complexing effect helps to produce the fine-grained oxides with particle size in the ultrafine scale（<100 nm） at heat-treatment temperatures below 500 ℃. The structures of the precursor complexes and the finally heat-treated particles were studied by means of IR, XRD, DSC, DTA and TG techniques. The morphologies of the particles were observed by using the SEM technique. The average particle sizes were calculated to be in the range of 3050 nm based on X-ray diffraction line-broadening and SEM images, indicating the poor conglomeration of crystallite at low temperatures.展开更多
For the first time, the diagnosis idea based on a correlation integral is proposed, which regards the correlation integral as a feature set. The correlation dimension is contained in the double-log curve of the correl...For the first time, the diagnosis idea based on a correlation integral is proposed, which regards the correlation integral as a feature set. The correlation dimension is contained in the double-log curve of the correlation integral to scale, so extracting features directly from the correlation integral can avoid the bottleneck problem of determining the range of non-scale length. Several features extracted from the correlation integral are better than the single feature of the correlation dimension when describing the signal. It is obvious that this method utilizes more information of the signal than does the correlation dimension. The diagnosis examples verify that this method is more accurate and more effective.展开更多
More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient hyperbola function transform method based on the idea of the extended homogeneous balance m...More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient hyperbola function transform method based on the idea of the extended homogeneous balance method.展开更多
In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When ...In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When these arbitrary functions are taken as some special functions, these solutions possess abundant structures. These solutions contain soliton-like solutions and rational solutions.展开更多
In this paper, a new generalized extended tanh-function method is presented for constructing soliton-like,period-form solutions of nonlinear evolution equations (NEEs). This method is more powerful than the extended t...In this paper, a new generalized extended tanh-function method is presented for constructing soliton-like,period-form solutions of nonlinear evolution equations (NEEs). This method is more powerful than the extended tanhfunction method [Phys. Lett. A 277 (2000) 212] and the modified extended tanh-function method [Phys. Lett. A 285 (2001) 355]. Abundant new families of the exact solutions of Bogoyavlenskii's generalized breaking soliton equation are obtained by using this method and symbolic computation system Maple.展开更多
Using the method of line structure light produced by a laser diode,three dimensional profile measurement is deeply researched.A hardware circuit developed is used to get the center position of light section for the im...Using the method of line structure light produced by a laser diode,three dimensional profile measurement is deeply researched.A hardware circuit developed is used to get the center position of light section for the improvement of the measurement speed.A double CCD compensation technology is used to improve the measurement precision. An easy and effective calibration method of the least squares to fit the parameter of system structure is used to get the relative coordinate relationship of objects and images of light section in the directions of height and axis. Sensor scanning segment by segment and layer by layer makes the measurement range expand greatly.展开更多
There are few applications of im ag e processing technology for diagnosing and state monitoring for internal combust ion (IC) engines, which is discussed in detail in this paper. The time-frequenc y distribution image...There are few applications of im ag e processing technology for diagnosing and state monitoring for internal combust ion (IC) engines, which is discussed in detail in this paper. The time-frequenc y distribution images of cylinder head vibration signals are obtained by decompo sing them with a wavelet packet algorithm. It is the first time that we look at time-frequency distribution images from the point of images. Based on this, a n ew method for applying image processing technology for diagnosing and state moni toring for internal combustion engines is presented in this paper. A valve fault diagnosis model is set up by image matching, which is realized on a four-strok e, six-cylinder diesel engine. At the same time, some notes are presented in th is paper. It has been proved that it is of no good effect to diagnose with histo grams of time-frequency images generated by cylinder head vibration signals tha t have been processed with a wavelet packet algorithm. The reason is given in th is paper. Comparisons of diagnosing effect are carried out between noise-added signals and original signals. It has little effect on diagnosing results after s ignals have been added with noise. The results show that this method has a clear physical meaning and is of good engineering practicability, feasibility, good p recision and high speed.展开更多
The finite element method (FEM) is applied to analyze sound characteristics of the viscoelastic coatings containing doubly periodic cavities immersed in water or adhered to steel plate between water and air. The refle...The finite element method (FEM) is applied to analyze sound characteristics of the viscoelastic coatings containing doubly periodic cavities immersed in water or adhered to steel plate between water and air. The reflection coefficients and transmission coefficients are obtained for the coatings with spherical, cylindrical or conic cavities in above two conditions. Moreover, the vibration modes of the coatings are analyzed. Numerical results show that the cavities have great impact on the sound characteristics at low frequency.展开更多
文摘We present a novel quantization-based digital audio watermarking scheme in wavelet domain. By quantizing a host audio’s wavelet coefficients (Integer Lifting Wavelet Transform) and utilizing the characteristics of human auditory system (HAS), the gray image is embedded using our watermarking method. Experimental results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as noising adding, lossy compression, low pass filtering, re-sampling, and re-quantifying.
文摘We study an approach to constructing multiple soliton solutions of the (3+1)-dimensional nonlinear evolution equation. We take the (3+1)-dimensional potential- YTSF equation as an example. Using the extended homogeneous balance method, one can find a Backlund transformation to decompose the (3+1)-dimensional potential-YTSF equation into a set of partial differential equations. Starting from these partial differential equations, some multiple soliton solutions for the (3+1)-dimensional potential-YTSF equation are obtained by introducing a class of formal solutions.
文摘By the application of the extended homogeneous balance method, we derive an auto-Bācklund transformation (BT) for (2＋1)-dimensional variable coefficient generalized KP equations. Based on the BT, in which there are two homogeneity equations to be solved, we obtain some exact solutions containing single solitary waves.
基金the Foundation of the Ministry of Science and Technology of China(No.G19990 2 2 4 0 8and0 0 1CB10 890 6 )
文摘The pure phases of alkaline earth molybdates MMoO 4, where M=Mg, Ca, Sr or Ba, were synthesized via the calcination of the related citrato oxomolybdate complexes. The mixed metal oxides can be highly dispersed at the atomic level due to the existence of uniform citrato oxomolybdenum precursors in definite composition. The complexing effect helps to produce the fine-grained oxides with particle size in the ultrafine scale（<100 nm） at heat-treatment temperatures below 500 ℃. The structures of the precursor complexes and the finally heat-treated particles were studied by means of IR, XRD, DSC, DTA and TG techniques. The morphologies of the particles were observed by using the SEM technique. The average particle sizes were calculated to be in the range of 3050 nm based on X-ray diffraction line-broadening and SEM images, indicating the poor conglomeration of crystallite at low temperatures.
文摘For the first time, the diagnosis idea based on a correlation integral is proposed, which regards the correlation integral as a feature set. The correlation dimension is contained in the double-log curve of the correlation integral to scale, so extracting features directly from the correlation integral can avoid the bottleneck problem of determining the range of non-scale length. Several features extracted from the correlation integral are better than the single feature of the correlation dimension when describing the signal. It is obvious that this method utilizes more information of the signal than does the correlation dimension. The diagnosis examples verify that this method is more accurate and more effective.
文摘More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient hyperbola function transform method based on the idea of the extended homogeneous balance method.
文摘In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When these arbitrary functions are taken as some special functions, these solutions possess abundant structures. These solutions contain soliton-like solutions and rational solutions.
文摘In this paper, a new generalized extended tanh-function method is presented for constructing soliton-like,period-form solutions of nonlinear evolution equations (NEEs). This method is more powerful than the extended tanhfunction method [Phys. Lett. A 277 (2000) 212] and the modified extended tanh-function method [Phys. Lett. A 285 (2001) 355]. Abundant new families of the exact solutions of Bogoyavlenskii's generalized breaking soliton equation are obtained by using this method and symbolic computation system Maple.
文摘Using the method of line structure light produced by a laser diode,three dimensional profile measurement is deeply researched.A hardware circuit developed is used to get the center position of light section for the improvement of the measurement speed.A double CCD compensation technology is used to improve the measurement precision. An easy and effective calibration method of the least squares to fit the parameter of system structure is used to get the relative coordinate relationship of objects and images of light section in the directions of height and axis. Sensor scanning segment by segment and layer by layer makes the measurement range expand greatly.
文摘There are few applications of im ag e processing technology for diagnosing and state monitoring for internal combust ion (IC) engines, which is discussed in detail in this paper. The time-frequenc y distribution images of cylinder head vibration signals are obtained by decompo sing them with a wavelet packet algorithm. It is the first time that we look at time-frequency distribution images from the point of images. Based on this, a n ew method for applying image processing technology for diagnosing and state moni toring for internal combustion engines is presented in this paper. A valve fault diagnosis model is set up by image matching, which is realized on a four-strok e, six-cylinder diesel engine. At the same time, some notes are presented in th is paper. It has been proved that it is of no good effect to diagnose with histo grams of time-frequency images generated by cylinder head vibration signals tha t have been processed with a wavelet packet algorithm. The reason is given in th is paper. Comparisons of diagnosing effect are carried out between noise-added signals and original signals. It has little effect on diagnosing results after s ignals have been added with noise. The results show that this method has a clear physical meaning and is of good engineering practicability, feasibility, good p recision and high speed.
文摘The finite element method (FEM) is applied to analyze sound characteristics of the viscoelastic coatings containing doubly periodic cavities immersed in water or adhered to steel plate between water and air. The reflection coefficients and transmission coefficients are obtained for the coatings with spherical, cylindrical or conic cavities in above two conditions. Moreover, the vibration modes of the coatings are analyzed. Numerical results show that the cavities have great impact on the sound characteristics at low frequency.
