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Nanobubbles are produced on hydrophobic surfaces when they are immersed in aqueous solutions. The effect of nanobubbles on the immersed surface is of interest in many applications. In the study presented here, immersion of the polystyrene film in de-ionized water for several hours produces nanoindents on the film surface. The typical diameter of the(More)
Based on the principle of the wavelength division multiplex (WDM), a data processing method which can increase the number of fiber Bragg grating (FBG) sensors in series is given. In this method, genetic algorithm (GA) is used to detect the Bragg wavelength of FBG. Simulations and experiments demonstrated that the Bragg wavelength can be detected when a(More)
Extraction of simple, effective and efficient decision rules for fault diagnosis is one of the most important problems in mechanical fault diagnosis because available information is often inconsistent and redundant. Using inconsistent and redundant information, an extraction method of decision rules based on the rough set theory is developed in this paper.(More)
The scanner is the most important part of Atomic Force Microscope (AFM), which directly determines an AFMpsilas measuring capability. However, the scanner made of piezoelectric materials always exhibits significant hysteresis and nonlinearity, and the hysteresis will reduce the positioning precision of AFM and cause distortion in scanning images. In this(More)
In this article, we have studied the surface nanobubbles on polystyrene (PS)/water interfaces using tapping mode atomic force microscopy (TM-AFM). Detailed bubble coalescence phenomenon of differently sized surface nanobubbles (with lateral size up to about ∼10 μm) was obtained. The quantity of gas molecules, before and after coalescence, was calculated. It(More)
Quantitative friction measurement of nanomaterials in atomic force microscope requires accurate calibration method for lateral force. The effect of contact stiffness on lateral force calibration of atomic force microscope is discussed in detail and an improved calibration method is presented. The calibration factor derived from the original method increased(More)
Extracting rules from incomplete data are usually more difficult than extracting rules from complete data in mechanical fault diagnosis. In order to extract simple and effective diagnostic rules from incomplete data, a method to directly extract decision rules for fault diagnosis from incomplete data based on rough set is proposed in this paper. The method(More)
The constant flux blanking plug is a downhole flow control device used in separate layer water injection system. During its design and improvement activities, it is necessary to know the flow characteristic and reliability in the downhole operating condition. But direct downhole experiment may interfere the regular oil extraction. The principle of the(More)
In fluid flow on hydrophobic surfaces, boundary slip occurs at the solid-liquid interface and nanobubbles on the surfaces are believed to be the reason for it. Boundary slip is of practical importance in micro/nanofluidics to reduce the drag force in fluid flow. However, nanobubbles tend to move under external disturbance. Therefore, the decreased degree of(More)