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Haoyu Zhao,Yucong Geng,Jieyu Fan,Ke Tao,Taiping Hou 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.2
A formaldehyde-degrading bacterium strain,FD3, was isolated from contaminated soil and identified as Paracoccus sp. based on partial 16S rRNA gene sequence analysis. In batch culture, the bacterium metabolized 5,000and 8,000 mg/L formaldehyde completely within 16 and 18 h, respectively, at 30oC (pH 7.0) with agitation at 150 rpm. The degradation kinetics was found to follow a first-order model at all initial formaldehyde concentrations with regression values greater than 0.99. Formaldehyde degradation rates increased from 532.37 to 2283.04 mg/L/h as the initial concentration of formaldehyde was increased from 1,000 to 8,000 mg/L. The growth of strain FD3 on formaldehyde as a sole carbon and energy source was well described by the Luong model with a maximal specific growth rate of 0.1754/h, a half-saturation constant of 309.02 mg/L, and a maximum substrate concentration of 3875.53 mg/L. Due to its high tolerance and degradation capacity to formaldehyde, Paracoccus sp., FD3 is considered an excellent candidate for use in degrading formaldehyde in wastewaters.
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Enlai Zheng,Yindong Fan,Rui Zhu,Yue Zhu,Jieyu Xian 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
It’s essential to establish a dynamic model of a wheeled tractor with suspended driver seat including air spring and Magnetorheological (MR) damper to analyze its vibration characteristics and performance. The equivalent linearized model of the wheeled tractor always neglects the effect of nonlinear stiffness for scissors linkage driver seat and air spring with auxiliary chamber as well as dynamic characteristics of real tractor tyre and considers the driver seat as linear spring and damper elements, which causes the analysis to have a lower precision. We considered the effect of nonlinear stiffness for scissors linkage seat and air spring with auxiliary chamber as well as MR damper and dynamic characteristics of real tyre and developed a complete nonlinear dynamic model of wheeled tractor with suspended driver seat including air spring and MR damper. The experimental results demonstrate that the improved nonlinear dynamic model is more consistent with the actual state than the equivalent linearized model, and the validity of the proposed model is verified. Furthermore, the effect of forward speed, ratio of volume for air spring with respect to volume of auxiliary chamber, and area of orifice on the acceleration of wheeled tractor was also investigated, which can provide a theoretical basis for control algorithm design of semiactive vibration isolation system.
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