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 & Computer science. The organization has 1696 authors who have published 1521 publications receiving 13541 citations.

Comparative study of the bio-remediation of eutrophic river water, using two biofilm processes

Abstract: Filamentous bamboo and plastic filling were used as biofilm carriers for the bio-remediation of nitrogenous compounds from eutrophic river water. Two corresponding biofilm reactors were developed: a filamentous bamboo reactor (FBR) and a plastic filling reactor (PFR). Experimental results indicated that the average removal rates of total nitrogen (TN), ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3−-N), nitrite nitrogen (NO2−-N), chemical oxygen demand using KMnO4 as oxidizer (CODMn) and chlorophyll A were 63.86%, 47.80%, 64.75%, 20.00%, 63.50% and 58.36% for FBR, and 11.29%, 18.24%, 43.90%, −165%, 9.56% and 15.25% for PFR, respectively. Statistically significant differences between FBR and PFR (p < 0.05) were noted in TN, NH4+-N, NO3−-N, NO2−-N and CODMn. The results showed that NO2−-N was associated with accumulation phenomena in the PFR. It was also noted that the observed diversity of microorganisms (Protozoa and Metazoa) and the biomass of nitrifying bacteria and denitrifying bacteria were higher on the filamentous bamboo than that on the plastic filling (p < 0.05). These results suggest that filamentous bamboo may be a potential carbon source that could be used for glucose-replacement during de-nitrification.

Effects of Heating Rate on the Dynamic Tensile Mechanical Properties of Coal Sandstone during Thermal Treatment

Abstract: The effects of coal layered combustion and the heat injection rate on adjacent rock were examined in the process of underground coal gasification and coal-bed methane mining. Dynamic Brazilian disk tests were conducted on coal sandstone at 800°C and slow cooling from different heating rates by means of a Split Hopkinson Pressure Bar (SHPB) test system. It was discovered that thermal conditions had significant effects on the physical and mechanical properties of the sandstone including longitudinal wave velocity, density, and dynamic linear tensile strength; as the heating rates increased, the thermal expansion of the sandstone was enhanced and the damage degree increased. Compared with sandstone at ambient temperature, the fracture process of heat-treated sandstone was more complicated. After thermal treatment, the specimen had a large crack in the center and cracks on both sides caused by loading; the original cracks grew and mineral particle cracks, internal pore geometry, and other defects gradually appeared. With increasing heating rates, the microscopic fracture mode transformed from ductile fracture to subbrittle fracture. It was concluded that changes in the macroscopic mechanical properties of the sandstone were result from changes in the composition and microstructure.

Efficient Two-Factor Authentication Protocol Using Password and Smart Card

Abstract: Two-factor authentication using password and smart card could reduce the risk than the use of a password alone. Recently, Chen et al. proposed a two-factor remote user authentication protocol using password and smart card and provide the criteria of authentication protocols. They claimed their protocol is secure against certain known attacks. In this paper, the authors showed that Chen et al.'s scheme is still vulnerable to the off-line password guessing attack, privileged administrator attack, key control attack and lacks of forward security. To solve these security problems, we propose an efficient two-factor authentication and key agreement protocol..

Bacterial removal of sulfur from the China lignite by a newly isolated bacterium, Sinomonas flava XL4

Abstract: The lignite coal collected from Shengli coalfield of Inner Mongolia Autonomous Region in China contains about 5.22% by mass total sulfur with a gross calorific value of 6329 cal g−1. In the present work, the coal sample was subjected to desulfurization by using a new bacterium isolated from the native coal mine site. The native bacterium was identified to be Sinomonas flava XL4 based on the 16S rDNA gene sequence analysis, and reported first time for the capability to remove about 44% of total sulfur from the lignite coal. The influence of various process parameters such as medium pH, incubation time, pulp density, particle size, incubation temperature on sulfur removal from the lignite after S. flava XL4 treatment was investigated, and the experimental results showed that the total sulfur content of lignite coal was reduce to 2.92% under optimum reaction conditions. In addtion, the calorific value of lignite coal after bacterium desulfurization increased from 6329 to 6678 cal g−1, and the ash content was eliminated. © 2015 American Institute of Chemical Engineers Environ Prog, 2015