Abstract: A knockdown heat sink structure includes a carrier body with a high-temperature section in contact with at least one heat source. A non-high-temperature section of the carrier body has a first radiating fin assembly, while a higher second radiating fin assembly is on the high-temperature section. The second radiating fin assembly has a first part higher than the height of the first radiating fin assembly, and a second part that outward spreads and extends from a top end of the first part and covers the first assembly without touching it, creating a spacing flow way. Therefore, the structure increases the heat dissipation area for the high-temperature section, allowing for faster heat dissipation.

Abstract: A structure with a photodiode, an HEMT and an SAW device includes a photodiode and an HEMT. The photodiode includes a first electrode and a second electrode. The first electrode contacts a P-type III-V semiconductor layer. The second electrode contacts an N-type III-V semiconductor layer. The HEMT includes a P-type gate disposed on an active layer. A gate electrode is disposed on the P-type gate. Two source/drain electrodes are respectively disposed at two sides of the P-type gate. Schottky contact is between the first electrode and the P-type III-V semiconductor layer, and between the gate electrode and the P-type gate. Ohmic contact is between the second electrode and the first N-type III-V semiconductor layer, and between one of the two source/drain electrodes and the active layer and between the other one of two source/drain electrodes and the active layer.

Abstract: A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.

Abstract: A resonant flyback power converter includes: a first and a second transistors which form a half-bridge circuit for switching a transformer and a resonant capacitor to generate an output voltage; a current-sense device for sensing a switching current of the half-bridge circuit to generate a current-sense signal; and a switching control circuit generating a first and a second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal controls the half-bridge circuit to generate a positive current to magnetize the transformer and charge the resonant capacitor. The turn-on of the second driving signal controls the half-bridge circuit to generate a negative current to discharge the resonant capacitor. The switching control circuit turns off the first transistor when the positive current exceeds a positive-over-current threshold, and/or, turns off the second transistor when the negative current exceeds a negative-over-current threshold.

Abstract: A heat sink structure includes a base seat and at least one heat dissipation unit. The base seat has a first face and a second face. At least one extension column extends from the second face of the base seat. The heat dissipation unit is disposed above the base seat and spaced from the base seat by a gap. The extension column serves to restrict or secure the heat dissipation unit in horizontal and vertical directions. The heat dissipation unit with different structures provides multiple heat dissipation features to enhance the entire heat dissipation performance.

Abstract: A bone augmentation product for guiding bone tissue regeneration includes a soft tissue barrier membrane in the form of a soft sheet, and a tissue-regeneration guiding material being integrally molded to one side of the soft tissue barrier membrane. The tissue-regeneration guiding material may be collagen for directly filling in a defective area on a tooth bed or an area on a bone requiring osteogenesis to thereby simplify the procedures and reduce the difficulty in a surgery.

Abstract: A tooth orthopedic appliance has a bracket, a plurality of middle supporting portions and a plurality of side wing portions. The bracket is connected to a surface of the tooth, wherein a base is provided on a middle part of the bracket. A main wire trench is utilized to locate a correcting wire. The plurality of middle supporting portions are located respectively at a middle part of two protruding portions of the bracket, wherein the middle supporting portions are parallel to the bracket and perpendicular to the main wire trench. A wire holding slot is formed in between the bracket and every middle supporting portion for hooking a holding wire. A notch is defined by sidewalls of the middle supporting portions and the side wing portions in order to locate the holding wire for locking a top portion of the correcting wire such that an unfastened condition is formed.

Abstract: An orthodontic pin includes a pin body and a fastening member screwed into the pin body. An elastic element is connected at an end to the orthodontic pin by extending the fastening member through a ring provided at the end of the elastic element before screwing it into the pin body. When the elastic element becomes loose due to any change in the position of a tooth being corrected, it can be determined the elastic element needs replacement. Since the fastening member can be easily loosened from the pin body of the orthodontic pin, the elastic element can be conveniently removed from the pin body to facilitate quick replacement of the elastic element.

Abstract: An orthodontic pin includes a pin body and a fastening member screwed into the pin body. An elastic element is connected at an end to the orthodontic pin by extending the fastening member through a ring provided at the end of the elastic element before screwing it into the pin body. When the elastic element becomes loose due to any change in the position of a tooth being corrected, it can be determined the elastic element needs replacement. Since the fastening member can be easily loosened from the pin body of the orthodontic pin, the elastic element can be conveniently removed from the pin body to facilitate quick replacement of the elastic element.

Abstract: A gum adjusting and shaping device mainly includes an outer die, an abutments of implanted tooth detachably put in the outer die, and a cap screw received in the abutments of implanted tooth for fixing the latter and the outer die to an artificial implant previously implanted in the tooth socket bone. The outer die is a cylindrical member having a rear end in the form of a truncated cone and can therefore advantageously expand the gum surrounding an empty tooth socket to where an artificial tooth is to be mounted. The expanded gum allows subsequent formation of a tooth mold deeply reaching the root of the abutments of implanted tooth to produce a desired artificial tooth completely matching with neighboring teeth.

Abstract: A gum adjusting and shaping device mainly includes an outer die, an abutments of implanted tooth detachably put in the outer die, and a cap screw received in the abutments of implanted tooth for fixing the latter and the outer die to an artificial implant previously implanted in the tooth socket bone. The outer die is a cylindrical member having a rear end in the form of a truncated cone and can therefore advantageously expand the gum surrounding an empty tooth socket to where an artificial tooth is to be mounted. The expanded gum allows subsequent formation of a tooth mold deeply reaching the root of the abutments of implanted tooth to produce a desired artificial tooth completely matching with neighboring teeth.