Based on the governing equations of the unsteady flow of the power law fluid in the eccentric annuli with the inner cylinder reciprocating axially in bipolar coordinate system, the calculation formulae of normal force distribution on the wall of the inner cylinder of the power law fluid flowing in the eccentric annuli with the inner cylinder reciprocating axially in the bipolar coordinate system were established,and the relevant numerical calculation method was given.Taking the aqueous solution of partially hydrolyzed polyacrylamides (HPAM) for examples,the normal force distribution were calculated by using the calculation formulae and numerical calculation method mentioned above, the curves of the normal force distribution on the wall of the inner cylinder of HPAM aqueous solution were plotted and the effects on the normal force distribution of the flow behavior index of the power law fluid, the stroke and the stroke frequency of the inner cylinder were analyzed.

The reactor was started up under the neutral condition. The pH value in the reactor was gradually lowered down. At pH 7.0, the average COD removal efficiency the biogas yield and the methane content of the UASB reactor were steady at 93% above, 25L·d-1and 54%, respectively. During the period of the pH value lowered from 7.0 to 5.5, the average of the COD removal efficiency, the biogas yield and the methane content of the UASB reactor were 83.1%, 19.6L/d and 47.7%, respectively. At pH 5.5, the operating condition of UASB reactor began to recover from the 76thday, and on the 84thday, the COD removal efficiency, biogas yield and the methane content recovered to 80.5%, 17.1L/d and 47.9%, respectively.

We present a probe of scanning near-field optical microscope (SNOM) with large aperture and high resolution, which is added a metallic dipole nano-antenna onto the tip of the ordinary probe. Based on the FDTD algorithm we investigate numerically the measure results by different aperture probes for the same sample with the incident wavelength of 830nm and the scan height of 10nm. The results show that the resolution of the new probe is 100nm, 75nm, 50 nm, 45 nm, 50 nm, 70nm when the probe aperture is 50nm, 100nm, 130nm, 150nm, 170nm, 200nm respectively, and for the ordinary probe the resolution is 50nm，120 nm,140 nm,180 nm, 200nm, 220nm correspondingly. That is to say the resolution of the ordinary probe decrease rapidly with the increasing of the aperture, however the novel probe can maintain the high resolution.

No abstract