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Based on the capillary pressure curves measured at lab, the pore structures distribution features were analyzed for cores with several permeability. The comparison between methods of the single-line and two-line fitting indicated the multi-fractal characteristics of the heterogeneous pore distribution. The study shows that the fractal dimension could be used to describe such characteristics. The greater...
This paper presents a case study of a 10-story concrete frame structure designed according to the Chinese Code GB50010-2002. To reduce the potential of progressive collapse due to single column failure, progressive collapse analysis is carried out following the DoD2009 guidelines. It is observed that most of longitudinal beams in superstructure and floors above the failure column would collapse as...
Based on the contents monitoring of ammonia nitrogen, TN, TP and COD in the sediments, the distribution of pollutants in the sediments along the Yuan River were analyzed. Through the contrast of pollutants contents between water and sediment in the same site, the sources of pollutants in the sediments were studied, from which it can be concluded that the concentrations in the river water are not higher...
Silt and fine sand taken from Huanyuankou Yellow River in Zhengzhou and pure water was chosen as three kinds of typical underlying materials, volatile behavior of BETX were studied on these. The study include volatilization dynamic curves of BTEX compounds and mixture and the optimized simulation formulas for them on the base of volatilization kinetics model. The results indicate that, on the same...
Evaluation of groundwater environment carrying capacity is a multi-objective, multi-criteria and multi-level comprehensive issue. Evaluation index system of groundwater environment carrying capacity was built and divided into some subsystems in accordance with each index's inherent stratification link. Every index's effect on carrying capacity system was obtained by normalization operations catastrophe-based,...
It is a multi-objective, multi-criteria, multi-level and high-dimensional comprehensive issue to assess groundwater resources and environment carrying capacity affected many factors. Projection pursuit (PP) technology was adopted to reduce dimension of the above non-linear and high-dimensional problem. Particle swarm optimization (PSO) algorithm was introduced to optimize projection index function,...
The main purpose of the research is to study the influence on shallow ground water by heavy metal in polluted river. In the lab-scale experiment polluted rivers were simulated by domestic sewage, and three kinds of natural sand were chosen as infiltration medium, it was found that Cr(VI) penetrated on the 13th day and then had a removal ratio of 77-99% in coarse sand, over 91% and 96% in two kinds...
This paper proposes a digital intermediate frequency (D-IF) receiver for inter-vehicle communications. Bandpass sampling is employed to lower the sampling rate. Appropriate selection of sampling rate and equivalent digital IF frequency results in a simplified Digital down converter (DDC). Meanwhile, the simplified DDC makes the combination of DDC and the following low pass filter (LPF) possible. This...
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