Applied Mechanics and Materials Vol. 737

Abstract: In view of the current situation that lacking of the guidance method on evaluation emergency ability for construction enterprises,This article uses the extension matter-element model to evaluate construction enterprise accident emergency ability. According to the time node characteristics of accident emergency ability,Using AHP for constructing the evaluation index system of accident emergency abilities of construction enterprises and determining the weight coefficient of each index ,Using extension theory to establish the evaluation model of construction enterprise emergency ability,and taking an example conducted evaluation and determined the accident emergency ability grade.

Abstract: According to the situation of high frequent accidents and supervision difficulties in highway construction project. The fuzzy evaluation model for the affecting factors of highway construction accidents was established. Through safety analysis on many accidents, it was considered that highway construction accidents were commonly affected by workers’ unsafe behavior, unsafe condition, environmental risk and management. Then the weight of relative factors were determined. Finally the highway construction safety management evaluation was built. It shows that this method is reasonable and handled, which provides a good thought for the scientific, quantitative and available evaluation of highway construction safety management.

Abstract: The formation of a loose engineering landslide is carried on, and the comprehensive analysis on the formation mechanism of landslide is studied. The stability checking is carried out. Accordingly, the treatments are put forward.

Abstract: In light of the special topography in loess gully areas, the mining subsidence disasters in which are classified into three types. The evolution process and formation mechanism of each subsidence type are analyzed, and puts forward corresponding control countermeasures. The collapse disaster is considered to be caused mostly when tensile stress in rock or soil exceed their tensile strength, while the landslide disaster is mainly initiated when shear stress exceed the shear strength. The slumping disaster, however, possess both the tensile failure and the shear failure mechanism. Methods of reducing damages such as coordinated and height-limit mining, designing protective coal pillar, backfill mining and mining down the slope can be adopted to prevent mining subsidence disasters in gully influence scope. Control measures such as slope cutting, crack grouting, collapse backfilling, support and reinforcement, planting vegetation are meanwhile needed. Measures for the restoration and emergency management must be taken after the disaster.

Abstract: In order to describe the influential factors of personnel underground behavior safety in metal mines scientifically, pointedly strengthen the safety precautions and decrease the accidents, personnel underground behavior safety characters and influential factors have been analyzed systematically. Furthermore, researches on the quantified degree of influence to personnel underground behavior safety of each factor have been done in this thesis. Complex comprehensive influences of multiple factors including personnel-self, mechanical equipment, production environment and management have been obtained based on safety evaluation system of man-machine-environment, therefore model for evaluating personnel underground safety behavior by grey relevance analysis has been built up to compare and analyze personnel behavior safety quantifiably, so that the primary and secondary factors have been found out finally. The model has been applied to one metal mine to analyze recent human-caused accidents due to human factors which reveals that factors of production environment and management have greater influence, and this conforms to actual production and safety state in our country.

Abstract: Distribution characteristics of content of soil organic carbon in wetland were studied by the analysis of four soil samples from areas, which were at different depths of soil, collected in the Dagu River estuary of Qingdao during summer of 2014. The result showed that the content of soil organic carbon in coastal wetland of Jiaozhou bay had an overall downward trend with the increase of soil depth. Because of the influence of hydro-salinity environment and tidal action, in regions near the sea, the content of soil organic carbon was less than its counterpart in regions away from the ocean.

Abstract: A bacteria strain for efficiently removing nitrite nitrogen was isolated and purified from sediment in shrimp pond, and the morphology of bacteria was observed using scanning electron microscopy, and the homology analysisof 16SrDNA sequence of the strain was conducted. The results showed that the strain was identified as Acinetobacter baumanii according to the morphological characteristics, physiological and biochemical characteristics and 16SrDNA sequence analysis. The isolated strain had a high heterotrophic nitrification function, the removal rate of nitrite nitrogen reached 97.17% after 12 h.

Abstract: An improved method for the determination of chemical oxygen demand (COD) is presented. This method is based on the standard method but using silver sulfate as a masking agent for the chloride and using the microwave for the digestion. The method gives tiny errors when the chloride of the samples increases from 606.6 mg/L to more than 30,000 mg/L. The method applies to the samples containing macromolecules and give better results when the sample is prehydrolysed.

Abstract: There is a growing interest in the application of ecological models to evaluate past, present, and future direct and indirect effects from various stressors including nutrients, organic wastes, flow, temperature etc. in aquatic ecosystems. For this study, AQUATOX simulation was established, calibrated and validated to model the aquatic ecosystem of Yincun Port River with field measured data and historical records between April 2013 and October2014. The results showed the AQUATOX simulation reasonably represented the real situation of Yincun Port. Moreover, sensitivity analysis revealed the value of Phytoplankton Chlorophyll was highly sensitive to nutrient input, temperature and parameters related to temperature limitations. Furthermore, this model was applied as a forecasting tool to analyze the response of Chl. a to nutrient input.

Abstract: A new non-autonomous predator-prey model in a polluted environment with stochastic perturbation is considered in this paper. The existence of a global positive solution and stochastically ultimate boundedness are derived. Furthermore, some sufficient and necessary criteria for extinction, non-persistence in the mean, weak persistence in the mean, strong persistence in the mean are obtained. At last, a series of numerical simulations to illustrate our mathematical findings are presented.