We first summarize the corrosion mechanisms of the reinforced concrete and also sum up the main corrosion factors affecting the reinforced concrete foundation and the action rules. Finally, we suggest some measures for the anti-corrosion of the foundation.

For the top ten urban agglomerations in China including Yangtze River Delta and Pearl River Delta, we calculated urban economic Gini indices and urban scale Gini indices, and judged the equilibrium of population and economic development after evaluation of Gini quotient indices. The results suggest that the degree of economic concentration of ten urban agglomerations is greater than the degree of population concentration. Secondly, the equilibria of population and economic development in top ten urban agglomerations are significantly different. Finally, regional differentiation features of the equilibrium of population and economic development in ten urban agglomerations are not obvious. In the following aspects, such as location factors, urban economy development, urbanization, urbanization approach, the population movement, management system and so on, we analyze the influencing factors.

With the 250m MODIS/NDVI times series datasets as main data source we reconstructed NDVI times series datasets with higher quality by Sacizkky-Golay filter, and we merged 500m MODIS multi-spectral reflectance data with 90m DEM data. With a combination of unsupervised classification and decision-tree methods, we extracted the land cover classification of Amur-Heilong River basin. We assessed the classification accuracy by using the current land cover map and high-resolution remote sensing images. The results indicate that acquirement of more accurate land cover classification by using MODIS/NDVI times series datasets is fessible.

By taking an isotropic layered medium model with depressed characteristic as example, we analyzed the advantages of the bordering method in solving conventional boundary absorbing problems. By taking a numerical example of an isotropic tilt model, we discussed the drawbacks of the outside bordering method and the origins of the boundary absorption in detail. The generalized numerical analyses show that the outside bordering method could introduce bogus reflected waves, and the reason was that the velocity continuation on the boundary brought in man-made diffraction points. The inside bordering method is proposed for the purpose of improving numerical simulation precision, signal-to-noise ratio, and credibility at the cost of regional effective wave field. The example illustrates that the proposed method is reliable and workable.

The given study was carried out in a small urban area near Shougang group. Sixty-five topsoil samples were collected and the concentrations of Cd, Cu, Pb, Cr, Zn, Ni, Mn, and Fe were analyzed. The results of descriptive statistics indicate that anthropic activities greatly influenced the concentrations of Cd, Pb, Zn and Cu. The pollution problems of Cd, Cu, and Zn have occurred, and the worst case was found in Cd. Principal component analysis and correlation analysis were applied and geostatistical analysis assisted with GIS tool was conducted. The results showed that eight metals could be grouped into three principal components (PCs) with moderate spatial autocorrelation. PC1 includes Cd, Cu, Pb, Cr, and Zn, which are related to traffic and vehicles. PC2 includes Cr, Mn, and Fe, which mainly come from the Shougang group. PC3 includes only Ni, which comes from pedogenic material. In general, the heavy metal pollution problems in the studied area could be attributed to traffic and vehicles to a large extent. Due attention should be paid to the subsequent environmental damage and potential human health risk. The present study plays a guiding role in the soil pollution risk assessment and the land use planning for this area.

The present study was conducted to evaluate the effects of different ratioes of amylopectin/amylose in dietary starch on digestibilities of dietary amino acids (AA) in weaning pigs. Results show that consuming dietary starch with different ratioes of amylopectin/amylose would affect the digestibility of AA and high concentration of amylopectin in dietary starch would improve the efficiency of AA in pigs.

The 66 alien invasive plants of 18 families were identified and recorded in Northeast China based on the field investigation and related literature. We desribe the species composition, origin, invasive ways, habitat, and distribution of the invasive plants in Northeast China and analyze the influence and harmfulness of the invasive plants. Some countermeasures and suggestions are presented.

In the project, the FPGA is required to communicate with the host computer. According to the conditions of the project, RS232C is chosen as a standard bus protocol and interface specification to design the UART driver. The goal of the design is to fulfill the communication in a short range. The design uses asynchronous communication and the FCS to keep the signal integrity and the veracity of the communication data. The software is programmed in VHDL language. Through long time testing, the driver is stable in working in the whole system and owns the capability to correct some errors in the data. The design of the driver provides a reliable means for the communication between the host computer and the FPGA and it is of deep significance.

This paper presents a design of block adaptive quantization (BAQ) algorithm immediately after echoes inter-frequency (IF) sampling for space-borne SAR system. Theoretical derivation is given in detail. Compared to the typical structure which implements BAQ after digital down conversion (DDC) in orbit, electrical system design is simplified and less hardware resource is needed when performing DDC on ground. Experimental results show that the two methods achieve similar performance with the same data rate when using mixer-free structure, and the resource for the new design is less than 1/3 of the resource for the typical structure.

Because real data of scattering interference for SAR are not available, a physical model of scattering interference for SAR is presented, and the scenario scatterer distribution characteristics are analyzed in this paper. The simulation results demonstrate that the scatterer incident angles for very diffuse scenario and moderately diffuse scenario cover the whole beam of SAR in azimuth, and then the spatial filtering algorithms are useless. However, numbers of correlated scatterer pairs increase when more samples are employed for the moderately diffuse scenario. Thus, space fast-time adaptive filter can be used to suppress scattering interference for moderately diffuse scenario.

In this paper, we presented an algorithm which can locate targets in data acquiring geometry and realize self-registration. The algorithm has an advantage over traditional algorithm which locates targets in zero doppler geometry. It can decrease computational burden of three-dimension geolocation and is as efficient as traditional algorithm. The algorithm is suitable for airborne dual-antenna InSAR system.

An improved SPIHT algorithm for texture image compression is proposed. A re-decomposition scheme is applied to the one order wavelet transformation coefficients independently in the LL, HL, LH, and HH sub-bands, and then the SPIHT algorithm is adopted to encode the mixed coefficients of the four sub-bands jointly. This method does not process the four sub-bands separately. The quantization bit allocation in the sub-bands is embedded in encoding process and precise bit allocation among the four sub-bands is automatically implemented. This method adequately utilizes the high frequency information of wavelet coefficients and efficiently preserves the image texture while the PSNR is not degraded. The experimental results validate the effectiveness of this improved algorithm for texture image compression.

In this paper, a modified sum-of-sinusoids statistical simulation method is proposed for Rayleigh channels. In some well-known methods, there exist problems that the probabiltiy density function (pdf) of the quadrature components and the squared envelope autocorrelation are nonstationary. It shows that the modified method can eliminate the above problems. It is proved in theory that the autocorrelations and cross correlations of the quadrature components and the autocorrelation of the complex envelope of the modified simulators match the desired ones exactly. Moreover, simulation results show that it has a better performance in terms of the probability density functions of the envelope and phase, the level crossing rate, and the average fade duration than the previous methods.

Mesh Gateways are destinations of data flows in Internet-accessing oriented WMN. The last-hop wireless links become bottleneck of WMN. Un-balanced data forwarding leads to lower capacity of the whole network, because it makes lower performance for some local areas. A new routing forwarding based on layer model is proposed in this paper. This strategy insures balance for upper-layer nodes using a balance factor. Capacity of whole WMN enhances accordingly. Simulation results indicate that compared with HWMP the layer routing can enhance the network capacity above 20% and management frame overhead is down to 40%.

An adaptive antenna experimental platform for GPS is designed and implemented, and it is intended for use in GPS anti-jamming research. The experimental platform consists of an antenna array, multi-channel RF front end, and a data collection system. Through the experimental platform, a variety of adaptive algorithms can be verified and thus the performance evaluation of adaptive algorithms can be made in real environment. The power inversion algorithm has been used on the experimental platform, and the results obtained demonstrate that the hardware platform allows collection of high-quality signal-plus-jamming data records for subsequent playback through a variety of anti-jamming algorithms.

A context transfer scheme for header compression in LTE (long term evolution) networks is introduced. The proposed scheme can reduce packet cost and signaling message delay in wireless radio links. A detailed description of the context transfer scheme is presented, which includes signaling message handling, parameter rebuilding, and state migration. The simulation analyses show the efficiency of the proposed scheme, and the scheme is suitable for voice-based wireless networks.

In Ref.[1] the authors proved the pseudorandomness of XOR-MAC(the tag generation algorithm of XOR-MAC is indistinguishable from a random function), based on which they claimed that they gave a new security proof for XOR-MAC. We have studied Wegman-Carter MAC and show that the pseudorandomness of randomized or statefull MACs does not imply the security of MACs, namely the unforgeability.

Through a comprehensive analysis of the attack way, composition structure, and attack code of malicious documents, we present a detecting method based on the mathematical statistics and vector computation, and make targeted improvements for a typical deformation means. We tested 119 documents using this algorithm, and the results show that, compared with conventional detection software, this algorithm detects a malicious document with low fail-to-report rate and low false alarm rate.

The ground clutter models and simulation algorithms available at present are summarized. The correlated vectors for ground clutter are considered for Rayleigh, Log-normal and Weibull distributions. Using typical models, ground clutters are generated on computer for the study of the feasibility of ZMNL algorithms. Simulated results show the validity of this algorithm.

This work focused on the two aspects of the space weather.One is the sources of the disaster space weather-coronal mass ejections(CME). We set up a new ice-cream cone model to describle the CMEs and discussed the geoeffectiveness of CMEs.The other is the end of the space weather-near-Earth environment. We introduced a newly installed Mie-Rayleigh-Sodium fluorescent lidar and its initial observations for the sodium layer between 80~110km,and also employed a meteor radar to study the mesospheric and low-thermospheric tides by canonical correlation alaysis.