Abstract: A resonant half-bridge flyback power converter includes: a first transistor and a second transistor which form a half-bridge circuit; a transformer and a resonant capacitor connected in series and coupled to the half-bridge circuit; and a switching control circuit configured to generate a first driving signal and a second driving signal to control the first transistor and the second transistor respectively for switching the transformer to generate an output voltage. The first driving signal is configured to magnetize the transformer. The second driving signal includes at most one pulse between two consecutive pulses of the first driving signal. The switching control circuit generates a skipping cycle period when an output power is lower than a predetermined threshold. A resonant pulse of the second driving signal is skipped during the skipping cycle period. The skipping cycle period is increased in response to the decrease of the output power.

Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A method is provided for fabricating a diol containing a bis-cycloaliphate. The diol is hydrogenated with hydrogen and a catalyst. Therein, the diol has a bis-aromatic. The catalyst comprises an active metal and a catalyst carrier. The active metal is a VIII-B-group transition element. The catalyst carrier is an oxide of IV-B-group element. Thus, the diol containing the bis-cycloaliphate is generated.

Abstract: A process for converting paraffin by using a modified zirconia catalyst is provided. The process has steps of: (i) providing feed containing n-pentane, n-hexane and more than 2 vol % n-heptane based on the volume of the feed; and (ii) subjecting the feed to isomerization of n-heptane with a modified zirconia catalyst comprising zirconium oxide, sulfate ions, a first metal component and a second metal component. Based on the weight of the catalyst, an amount of the first metal component ranges between 0.1 wt % and 15 wt %, an amount of the second metal component ranges between 0.2 wt % and 3.0 wt %, and an amount of the sulfate ions contain sulfur is less than 1.0 wt %. By using the modified zirconia catalyst with low sulfate content, the process is beneficial to improve iso-C7 selectivity and conversion rate in heptane isomerization.

Abstract: The present invention provides a modified zirconia catalyst including zirconia, sulfate anion, a first metal component and a second metal component, wherein the first metal component can contain aluminum or gallium, and the second metal component includes platinum or palladinum. The weight percentage of sulfur atoms of the sulfate anion based on the weight of the modified zirconia catalyst is less than 1.0 wt %. Decreasing the sulfate content of the modified zirconia catalyst during impregnation can remarkably enhance the iso-C7 selectivity and adding alumina into the modified zirconia catalyst can maintain the catalytic activity thereof. The present invention also provides a manufacturing method of the modified zirconia catalyst described above.