Learn More
Bacteria communicate with each other by a process termed "quorum sensing" (QS), and diffusible, low-molecular-weight chemicals, called signal molecules, are used as the communication languages. In cell-free Burkholderia cepacia CF-66 culture supernatants, five compounds suspected of being signal molecules were identified. The gene (cepI) related with AHLs(More)
With the soils cropped Rehmannia glutinosa for one and two years as test materials, this paper studied the variations of microbial flora and enzyme activities in rhizosphere. The results showed that with increasing year of cropping, the numbers of bacteria and fungi in rihzosphere had a slight decrease. In the soil successively cropped R. glutinosa for two(More)
Two extracellular polysaccharides, ENP1 and ENP2, were isolated from the fermentation liquid of the marine fungus Epicoccum nigrum JJY-40 by anion-exchange chromatography and gel-filtration chromatography, and their structures were investigated using chemical and spectroscopic methods including methylation analysis and NMR spectroscopy. The results(More)
This paper studies the reliability of infinite slopes in the presence of spatially variable shear strength parameters that increase linearly with depth. The mean trend of the shear strength parameters increasing with depth is highlighted. The spatial variability in the undrained shear strength and the friction angle is modeled using random field theory.(More)
A Model Predictive Control strategy is proposed for the flight control laws design. The modified MPC controller block is applied to the autopilot. The simulation framework uses MATLAB's basic configuration and Aerosim Aeronautical Simulation Blockset which provides a complete set of tools for rapid development of 6 DoF nonlinear aircraft models. The(More)
Based on the model following control method, a sliding mode controller is designed for the flight control system with wind disturbances. With this controller, the controlled plant can track the reference model outputs precisely. It is shown that this scheme provides better performance for the flight control system with uncertain disturbances. In this paper,(More)
An adaptive sliding mode controller is presented for fault-tolerant flight control system against the loss-ofeffectiveness actuator faults. This proposed scheme employs the robustness of adaptive sliding mode control to accommodate the faults effect on the system without the fault detection and isolation mechanism. The adaptive rules are derived from the(More)
An indirect adaptive controller is developed for a class of multiple-input multiple-output (MIMO) nonlinear systems with unknown uncertainties. This control system is comprised of an L 1 adaptive controller and an auxiliary neural network (NN) compensation controller. The L 1 adaptive controller has guaranteed transient response in addition to stable(More)
Vapours of organic matters were determined qualitatively employed with ultraviolet-visible absorption spectroscopy. Vapours of organic matters were detected using ultraviolet-visible spectrophotometer employing polyethylene film as medium, the ultraviolet and visible absorption spectra of vegetable oil vapours of soybean oil, sunflower seed oil, peanut oil,(More)
A sliding mode controller based on model following control is designed for the flight control system with uncertainties and perturbations. With this controller, the controlled plant can track the reference model precisely. It is shown that this scheme provides better performance for the flight control system and the fault tolerant control objective is(More)