Abstract: A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

Abstract: The present invention discloses a method for making a golf club head by using a bismuth-containing titanium alloy having an improved castability. The mechanical properties of the cast are evaluated to develop a method for making a golf club head with high strength from bismuth-containing titanium alloy, so that a golf club head can be made from a high strength and low modulus titanium alloy by casting with an improved yield in comparison with that of the casting method using tho conventional titanium alloy.

Abstract: The present invention discloses a printed antenna structure. The printed antenna structure comprises: a dielectric layer having opposed surfaces, a ground plane layer covered on the first surface of the dielectric layer, a feed-line extending over the second surface of the dielectric layer and connecting to a driving circuitry, a primary radiating element connected to the feed-line and not extending over to the ground plane layer, and a tuning element connected to the primary radiating element and not extending over to the ground plane layer for adjusting the radiating frequency. The timing element her comprises two stubs each having a free end spaced apart from each other and a fixed end connected to the primary radiating element so as to reduce the overall length of the printed antenna.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;” phase as a major phase. The titanium alloy composition contains at least one isomorphous beta stabilizing element selected from Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9. The work piece is preferably a medical device.

Abstract: In order to improve castability of a titanium alloy, 0.01-5 wt %, preferably 0.1-3 wt %, of bismuth is introduced into the titanium alloy, based on the weight of bismuth and the titanium alloy. The titanium alloy is suitable for making a dental casting or a medical implant by casting.

Abstract: A biocompatible binary titanium-niobium (Ti—Nb) alloy having a low modulus and a high strength, and containing &agr;″ phase as a major phase is disclosed. The binary Ti—Nb alloy contains 10-30 wt % of Nb, preferably 13-28 wt % of Nb, and the balance titanium, which is suitable for making a medical implant such as an orthopedic implant or dental implant.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;″ phase as a major phase. The titanium alloy composition contains at least one isomorphous beta stabilizing element selected from Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9. The work piece is preferably a medical device.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;″ phase as a major phase. The work piece is preferably a medical implant.

Abstract: The present invention discloses a printed antenna structure. The printed antenna structure comprises: a dielectric layer having opposed surfaces, a ground plane layer covered on the first surface of the dielectric layer, a feed-line extending over the second surface of the dielectric layer and connecting to a driving circuitry, a primary radiating element connected to the feed-line and not extending over to the ground plane layer, and a tuning element connected to the primary radiating element and not extending over to the ground plane layer for adjusting the radiating frequency. The timing element her comprises two stubs each having a free end spaced apart from each other and a fixed end connected to the primary radiating element so as to reduce the overall length of the printed antenna.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;″ phase as a major phase. The titanium alloy composition contains at least one isomorphous beta stabilizing element selected from Mo, Nb, Ta and W; and the balance Ti, wherein said composition has a Mo equivalent value from about 6 to about 9. The work piece is preferably a medical device.

Abstract: Quenching a work piece made of a titanium alloy having a temperature higher than 800° C. to a temperature lower than 500° C. at a cooling rate greater than 10° C./second between 800° C. and 500° C. is used to render the cooled work piece containing &agr;″ phase as a major phase. The work piece is preferably a medical implant.

Abstract: A biocompatible binary titanium-niobium (Ti—Nb) alloy having a low modulus and a high strength, and containing &agr;″ phase as a major phase is disclosed. The binary Ti—Nb alloy contains 10-30 wt % of Nb, preferably 13-28 wt % of Nb, and the balance titanium, which is suitable for making a medical implant such as an orthopedic implant or dental implant.