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We consider the problem of estimating the focal length of a camera from two views while the focal length is not varied during the motion of the camera. An approach based on Kruppa s equations is proposed. Specifically, we derive two linear and one quadratic equations to solve the problem. Although the three equations are interdependent in general, each one(More)
An one-year of sampling aerosol program was carried out during the period of April 1995 to April 1996 at coastal region, Cape D'Aguilar, in Hong Kong. The trace element composition of aerosol particles (TSP and PM10) were measured and analyzed by using the Instrumental Neutron Activation Analysis (INAA) and Inductive Couple Plasma-Mass Spectrometry (ICP-MS)(More)
TEMPO/NaBr/NaClO-mediated surface oxidation of NCC, acid-extracted from aspen kraft pulp, was studied, and the properties of nanocellulose whiskers before and after oxidation were characterized by conductimetry, Fourier transform infrared spectroscopy, X-ray diffraction, and atomic force microscopy. The resulting products with varied oxidation degrees were(More)
Aqueous metal salt solutions were used as models to probe the origin of the species observed in the electrospray mass spectrum. A qualitative or semiquantitative correlation among different species was observed between electrospray responses and calculated equilibrium aqueous solution concentrations. Quantitative correlations were obtained, however, when(More)
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