The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Compressive sensing offers a new wideband spectrum sensing scheme in cognitive radio. In this paper, a sparse signal recovery algorithm based on sparse Bayesian learning (SBL) framework is proposed. By exploiting intrablock correlation in a block sparse model and using Expectation-Maximization (EM) method, this algorithm achieves superior performance. The results of experiments show that this algorithm...
County is the basic unit of studying regional economy, and the realization of a coordinating and harmonious development of county economy would be much easier if we can clarify and thoroughly understand the characteristics and key factors of county economic growth. This thesis first combs the achievements of spatial economic theories and methods that gained in recent years in the research of regional...
From the view of financial development, the relations between financial development and urban-rural income gap in Tianjin from 1980 to 2008 were cointegration analyzed based on VAR model. Results indicated that a long-run equilibrium relation exists between financial development and urban-rural income gap in Tianjin. A positive correlation lies between financial development dimension, while a negative...
For the single channel autoregressive moving average (ARMA) signals with multisensor, and with unknown model parameters and noise variances, the fused estimators of model parameters and noise variances can be obtained by the recursive instrumental variable (RIV) algorithm, the correlation method and the Gevers-Wouters algorithm with dead band. They have the consistency. The optimal distributed fusion...
DI materials were quenched at the temperature of 250°C, 300°C, 350°C and with the isothermal time of 1h, 2h and 3h respectively. So there were nine different ADI materials, which owned different mechanical properties. Through analyzing the changes of their metallographic structures, curves of the relationships between quenching temperatures, isothermal time and materials intensity, hardness could...
Surface water quality is negatively influenced by the urbanization process to pollutant loads in stormwater runoff and increases in runoff peaks and volumes. The first flush effect is the main impetus for pollutants transportations. This study compared the characteristics of first flush effect on stormwater runoff from blacktop driveway, concrete roof, and roof with grassland. The first flush effects...
Fixed Assets Investment (FAI) is an economic activity to construct and purchase the fixed assets, which namely is an activity of the fixed assets. In this paper, we use the method of H-P filter to make an operation state analysis on the structure elements of FAI and itself, and make a co-integration analysis on the key impact factors of FAI, which its results show FAI is in smooth and stable situation...
A new color image encryption algorithm based on hyper chaos is proposed in this paper. Four chaotic sequences are generated from a 4D hyper chaos. The R, G, B channels of plain image are firstly encrypted respectively according to the former three sequences with intercross cipher-block chaining mode; then the encrypted image is permuted by choosing different channels. After several rounds of encryption,...
Regional supply capacity of rural infrastructure is an important impact of agricultural development level, it related to the level of agricultural development, rural development and farmers' income improving. This paper builds a model of regional rural infrastructure supply level indicator system of China's 31 provinces (region), use of factor analysis on China's regional rural infrastructure supply...
The image feature matching is a critical step in photography measurement and rebuilding. Based on the characteristics of topography measurement, a new topography feature matching algorithm is presented in this paper. In the algorithm, the stereo images to be matched are partitioned, and then the region matching process is used to these partitioned image pairs. Based on the region matching, the corner...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.