Abstract: A method for preparation of gold nanoparticles in aqueous solution through pulsed laser, comprises firstly preparing an aqueous solution including HAuCl4.H2O and H2O2, followed by allowing a catalytic light source to emit into the aqueous solution for catalysis, such that a plurality of gold nanoparticles are formed in the aqueous solution, the catalytic light source being a pulsed laser. Additionally, it is also possible for firstly placing a porous silicon substrate into the aqueous solution, and then allowing the catalytic light source to emit into the aqueous solution for catalysis, such that the gold nanoparticles are grown on the surface of the porous silicon substrate. In this way, the gold nanoparticles of smaller particle diameters with more uniform size may be obtained without adding a surfactant during the preparation.

Abstract: A method for preparation of gold nanoparticles in aqueous solution through pulsed laser, comprises firstly preparing an aqueous solution including HAuCl4.H2O and H2O2, followed by allowing a catalytic light source to emit into the aqueous solution for catalysis, such that a plurality of gold nanoparticles are formed in the aqueous solution, the catalytic light source being a pulsed laser. Additionally, it is also possible for firstly placing a porous silicon substrate into the aqueous solution, and then allowing the catalytic light source to emit into the aqueous solution for catalysis, such that the gold nanoparticles are grown on the surface of the porous silicon substrate. In this way, the gold nanoparticles of smaller particle diameters with more uniform size may be obtained without adding a surfactant during the preparation.

Abstract: A portable electronic device and an operation method using the portable electronic device include presetting function modes applicable to specific user interfaces of the portable electronic device, and presetting operations in each of the function modes and a command corresponding to each of the operations. Signals are detected from a first and a second proximity sensors of the portable electronic device, and a time length of each signal is calculated. A command corresponding to a current operation is executed if the current operation is determined to accord with one of the preset operations according to the detected signals and the time length.

Abstract: A method for broadcasting advertisements is used on an electronic device. The electronic device may download the advertisements from a server of an advertiser. When the electronic device is awaked from a sleep state, the advertisements are broadcasted on a display of the electronic device. After the advertisements are broadcasted, the display then displays a window already displayed on the display before the electronic device enters the sleep state.

Abstract: A method and a communication device that includes a proximity sensor acquires a current distance between a user and the communication device when the communication device receives an incoming phone call. The method and the communication device establishes a communication with the incoming phone call and starts a speaker of the communication device to answer the incoming phone call, when the current distance is less than a preset threshold distance.

Abstract: A system and method for providing business information to a communication device include partitioning a region for each base station, and creating a database to store business information of each region. The system and method further include receiving a query request from the communication device through a base station, determining a region corresponding to the base station, and sending business information of the determined region to the communication device.