An electronic device includes a first image sensor, a second image sensor, one or more image processing modules, and a display. The first image sensor generates first image data. The second image sensor generates second image data. The one or more image processing modules process one or more image data among the first image and the second image data. The display displays the one or more image data among the first image data or second image data processed by the one or more image processing modules. The thumbnail generation module generates thumbnail data using the one or more image data among the first image data and second image data processed by the one or more image processing modules. A method includes converting the plurality of image data into a format displayable on a display, and generating thumbnail data using the image data of the displayable format.

A composite embankment structure includes an embankment, an airflow-enhanced embankment ventilation structure, and a heat pipe system. The embankment includes an embankment filler layer, a ventilation slab lower leveling layer, a ventilation slab upper cushion, and a pavement structure layer arranged in sequence from bottom to top. The ventilation slab in the airflow-enhanced embankment ventilation structure is arranged between the ventilation slab lower leveling layer and the ventilation slab upper cushion. The heat pipe system includes a heat pipe, and one end of the heat pipe is inserted into the embankment from an embankment slope and is located under the ventilation slab.

There is disclosed a catalytic substrate surface where in the substrate surface comprises particles in the size range 2-500 nm, said particles comprising TiO.sub.2, wherein at least 50 wt % of the Ti in the particles is leachable in 37% HCl. A method for its manufacture is also provided. One advantage is that the higher fractions of Ti leachable in 37% HCl give a better coating with better adhesion, in particular on objects comprising protonatable acidic oxides, such as SiO.sub.2. The higher fraction of Ti leachable in 37% HCl gives better transparency and dispersion stability. The resulting surface exhibits both improved activity and improved adhesion of the particles. There is no color change and/or speckles on the substrate, allowing anti-pollution surfaces to be produced also on decorative surfaces. The TiO.sub.2-comprising layer is thin and easily applied in the production line.