The impact of blast load is always taken into consideration in significant building and protective construction. In order to study the mechanical behavior of the concrete slab under blast load, the dynamic responses of a square concrete slab under surface explosion are simulated by the nonlinear finite element program ANSYS/LS-DYNA. The JOHNSON_HOLMQUIST_CONCRETE model is used for concrete material and the damage and strain rate effect are considered in this mode1. The simplified exponential load is used as blast load. The Z-displacement,Mises effective stress and damage state of concrete slab under different blast load of corresponding scaled distance are investigated and discussed. It can be found from the results that the influence of blast pressure can be neglected when scaled distance is around 2.0 and the damage of slab is beginning from the edge.
A new-styled continuous stirred tank reactor (CSTR) seeded with activated sludge attached onto granular activated carbon (GAC) was developed for raised hydrogen production using diluted grenadine syrup. Emphasis was placed on the hydrogen producing performance and stability of the reactor. It was found that the temperature of (35 ± 1) °C, hydraulic retention time (HRT) of 4h, influent COD of 6000mg/L, the maximum hydrogen production was up 12.06L/d. In addition, though pH decreased to 3.42, the microbial growth still high and COD removal rate reached 50%, demonstrating that the reactor processed the ability of acid resistance.
Polyphenylalkane derivatives Q 0720Studies on the Lanthanum-Induced Pinacol Coupling of Aromatic Aldehydes and Ketones in Aqueous Media. -Ultrasound irradiation can efficiently prompt pinacol coupling of aldehydes in acidic aqueous media in the presence of La. In contrast, aromatic ketones show much lower reactivity due to the steric hindrance around the carbonyl group. -(BIAN*, Y.-J.; YU, X.-G.; PENG, H.
Hydraulic method for earthwork excavation construction technology has a strong advantage in small environmental pollution, low cost, simple process, energy saving. It follows the idea of a harmonious society and the sustainable development, in line with the energy saving and emission reduction policy that the state promoted and also saving cost. This paper put emphasis on the theory of hydraulic method for earth excavation construction technology, construction process and key operation points, and the problems frequently encountered in construction and countermeasures. Combining with the project in Xinxiang new plain area in Henan province, which is about taking advantage of Yellow River to develop agriculture, the paper illustrates the economic benefit and social benefit of this construction technology.
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