Papers by Keyword: Correlation

Abstract: Through collecting real liquefaction in-situ data available worldwide, the correlations of influencing characteristics parameters such as PGA, water table depth, buried depth of sandy layer, SPT counts and shear wave velocity with respect to liquefaction were analyzed by means of Pearson correlation method. The correlative performance of the characteristic parameters with liquefaction was comparatively analyzed under conditions of varying buried depths, water tables and seismic intensities. The real correlations of the characteristic parameters with liquefaction were obtained corresponding to real dynamic loading, real buried condition and in-situ testing data. The analytical results show that water table, buried depth of sandy layer, SPT and shear wave velocity keep negative correlations with respect to liquefaction while correlation of PGA with liquefaction was positive. The correlations of buried depth of sandy layer, SPT were remarkable while the correlations of water table, shear wave velocity were weak. The correlation coefficient of SPT was the largest, followed by buried depth of sandy layer, PGA and water table; and the correlation coefficient of shear wave velocity was the smallest. The results presented herein can be used for updating the liquefaction evaluation methods in the codes.

Abstract: Nowadays, glass is a very popular building material, in various forms (fill openings, insulation, and composites [1]) even if it is primarily regarded as a filler material in the Czech Republic and widely used in residential developments [2]. There is an effort to extend the applicability of glass in the building industry. The article deals with the experimental bending tests of multilayer glasses. The bending tests were performed for the determination of the maximum load capacity at destroying the integrity of the samples. The results of the performed tests were statistically evaluated. The aim was to find dependence between the thickness of the multilayer glass and its load capacity.

Abstract: In this study reliability theory was applied in evacuation time of pedestrians in the subway, especially taking the correlation of pedestrian speed and pedestrian flow coefficient into account. Firstly, the traditional evacuation time design formula was regarded as research model. Statistical distribution of pedestrian speed and pedestrian flow coefficient in the model was analyzed .Thus the reliability limit state equation was built. Then the evacuation time’s reliability probability was obtained according to the checking point method of generalized random space. At last the process of how different factors influence the reliability was analyzed. Results show that we should consider the correlation between pedestrian speed and export flow rate when correlation is big (absolute value is greater than 0.5, for example).Our conclusions will contribute to related research and the formulation of actual planning.

Abstract: The solubility of hexachlorobenzene in different solvents (hexachlorobutadiene, tetrachloroprene, benzene, toluene and chloroform) at different temperatures was measured by the dynamic laser method and equilibrium method. The measured solubility data were correlated with Apelblat empirical equation. The results show that the equation is suitable for description of the solubility data of hexachlorobenzene in the above solvents.

Abstract: As for the pricing by electrical energy quality and the decision of rewards and penalties based on the examination at assessment point, Comprehensive evaluation on power quality is one of the principal foundations. To analysis and evaluate electric power quality for electric power company is a focus research at present. In this paper, the power quality evaluation model based on the matter-element extension theory is applied to power quality evaluation service. For power quality evaluation system of the characteristics of the complexity and incompatibility between various indicators hierarchies, this paper applied the theory of matter-element extension constructing Matter-element model, and identified level of power quality of power supply company through the calculation of weight and the correlation service. Taking GanSu Grid Company as an example to evaluate power supply quality, the results show that the evaluation results of power quality evaluation method based on the matter-element evaluation method are more objective, more precise and more reasonable.

Abstract: Radar obtains motion information of target from received modulated electromagnetic waves, which is usually periodical pulses or continuous waves. In this process, noise will affect the detection performance. However, as a modulated transmitting signal, noise has incomparable advantages over traditional radar. In this article, the mechanism of noise as modulation signal is introduced, and subsequently focused on the principles of distance ranging the corresponding estimation methods are proposed. Besides, the interference resistance characters of noise radar is verified by simulation.

Abstract: Database is distributed stored in cloud. The paper found that joint distribution can base on frequent data manipulation, and frequent connection property. So it proposed cloud database data distribution strategy based on association rules. The data distributed storage is according to the frequent data manipulation rules. Experiments demonstrate that this strategy can significantly reduce database query response time, especially in connection query response time.

Abstract: Under the effects of remanent magnetization, total magnetization direction is different from geomagnetic field direction, which makes magnetic data processing and interpretation complexity. In this paper, we present a new approach for estimating the total magnetization direction of sources via cross-correlation between the reduced-to-pole anomaly and the normalized source strength (who is less sensitive to remanent magnetization). The geomagnetic field direction is used to calculated the normalized source strength, while various assumed total magnetization directions are used to calculated the RTP anomalies. The maximum correlation between the RTP anomalies and the normalized corresponds to the estimated total magnetization direction. Test on synthetic data showed that the new approach is simple and effective.

Abstract: Physical and chemical properties were measured to study quality of 4 strawberry cultivars, which were fruit weight, firmness, crude protein, juice yield, total anthocyanin, total phenols, total sugar, titratable acid, total soluble solid, pH, water content, electrical conductivity, surface color (L, a, b). The result showed that 15 properties had significantly difference between 4 strawberry cultivars, the variance of these 15 properties ranged from 0.36% to 29.68%. The correlation analysis showed that 15 properties had 5 couple properties significantly correlation (p<0.05), fruit weight and crude protein, juice yield and titratable acid, total anthocyanin and total phenols, titratable acid and surface color a, electrical conductivity and surface color b. The correlation of other properties were not significantly in this study.

Abstract: The number of substrate microorganisms and enzyme activities of a lab-scale subsurface infiltration system (SIS) were monitored by plate counts, MPN and colorimetric analysis. The removal rates of BOD, COD, TP, TN and ammonia-N were measured. The results showed there were significantly positive correlation (P<0.05) between numbers of bacteria, fungi in the substrate and removal rates of COD and BOD. The correlation between number of nitrifying bacteria and removal rates of ammonia-N and correlation between number of denitrifying bacteria and removal rates of TN were significant. Meanwhile, a significant correlation between phosphatase activities and removal rates of TP (r=0.9885, P<0.05) can be also found. There was significantly positive correlation between urease activities and removal rates of TN (r=0.9698, P<0.05). These conclusions give reference to future research on utilizing substrate microorganisms and enzyme activities as an evaluating wastewater purification effects in SIS.