Xuzhou Institute of Technology

About: Xuzhou Institute of Technology is a education organization based out in Xuzhou, China. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 1696 authors who have published 1521 publications receiving 13541 citations.

Effects of strain rates on mechanical properties of limestone under high temperature

Abstract: The experimental tests for limestone specimens at 700 °C in uniaxial compression were carried out to investigate the mechanical effects of loading rates on limestone by using a MTS810 rock mechanics servo-controlled testing system considering the loading rate as a variable. The mechanical properties of limestone such as the stress–strain curve, variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the strain rates ranging from 1.1 × 10−5 to 1.1 × 10−1 s−1. (1) Sharp decreases were shown for the peak strength and elastic modulus of limestone from 1.1 × 10−5 to 1.1 × 10−4 s−1 at 700 °C as well as a downward trend was shown from 1.1 × 10−4 to 1.1 × 10−1 s−1 with the rise of the strain rate. (2) The peak strain increased from 1.1 × 10−5 to 1.1 × 10−4 s−1, however, there was no obvious changes shown for the peak strain of limestone from 1.1 × 10−4 to 1.1 × 10−1 s−1. These results can provide valuable references for the rock blasting effect and design of mine.

Effects of water level fluctuation on phytoplankton succession in Poyang Lake, China – A five year study

Abstract: Poyang Lake is the largest freshwater lake in the Yangtze floodplain in China, with dramatic seasonal water level changes each year. The quarterly monitoring data from 2009 to 2013 was used to study the impact of the water level fluctuation on the phytoplankton biomass and taxonomic composition variation in different hydrological phases in Poyang Lake. Bacillariophyta species are generally dominant in Poyang Lake, constituting more than 50% of the total phytoplankton biomass, except from July 2009 and January 2012. The results that phytoplankton biomass increased gradually from 2009 to 2013, especially after 2012, indicated there is some time lag in the response of phytoplankton biomass to nutrient loading in Poyang Lake. Our results support the hypothesis that water level fluctuation exert great influence on phytoplankton succession and hydrology fluctuations have an indirect impact on a decrease of Cyanophyta biomass with regard to dilution of nutrients (P, N) in Poyang Lake. This study indicates that we should keep the water level changes more or less as they are because ecologically relevant in Poyang Lake.