Abstract: The invention provides a device for sputtering comprising a main magnet, two secondary magnets mounted on two sides of the main magnet symmetrically, and a shell. The two secondary magnets face to each other in ends with the same polarity in a line. The shell is cylindrical and contains the main magnet and the secondary magnets.

Abstract: The invention provides a device for sputtering comprising a main magnet, two secondary magnets mounted on two sides of the main magnet symmetrically, and a shell. The two secondary magnets face to each other in ends with the same polarity in a line. The shell is cylindrical and contains the main magnet and the secondary magnets.

Abstract: A method and system is disclosed for measuring a wideband loop sensitivity SL(f) for an acoustic transducer in an acoustic probe. A pulse signal is employed as a wideband reference signal Vr(t); and, in a pulse-echo measurement a corresponding wideband echo signal Ve(t) is obtained. A normalized loop frequency response {circumflex over (X)}(f) for the acoustic transducer is defined as a ratio of a Fourier Transform of the Ve(t) to a Fourier Transform of the Vr(t). A wideband loop sensitivity SL(f) for the acoustic transducer is defined as an absolute square of the {circumflex over (X)}(f) in decibel.

Abstract: A method and system is disclosed for measuring a wideband loop sensitivity SL(f) for an acoustic transducer in an acoustic probe. A pulse signal is employed as a wideband reference signal Vr(t); and, in a pulse-echo measurement a corresponding wideband echo signal Ve(t) is obtained. A normalized loop frequency response {circumflex over (X)}(f) for the acoustic transducer is defined as a ratio of a Fourier Transform of the Ve(t) to a Fourier Transform of the Vr(t). A wideband loop sensitivity SL(f) for the acoustic transducer is defined as an absolute square of the {circumflex over (X)}(f) in decibel.

Abstract: A method and system is disclosed for measuring a wideband loop sensitivity SL(f) for an acoustic transducer in an acoustic probe. A pulse signal is employed as a wideband reference signal Vr(t); and, in a pulse-echo measurement a corresponding wideband echo signal Ve(t) is obtained. A normalized loop frequency response {circumflex over (X)}(f) for the acoustic transducer is defined as a ratio of a Fourier Transform of the Ve(t) to a Fourier Transform of the Vr(t). A wideband loop sensitivity SL(f) for the acoustic transducer is defined as an absolute square of the {circumflex over (X)}(f) in decibel.

Abstract: A method and system is disclosed for measuring a wideband loop sensitivity SL(f) for an acoustic transducer in an acoustic probe. A pulse signal is employed as a wideband reference signal Vr(t); and, in a pulse-echo measurement a corresponding wideband echo signal Ve(t) is obtained. A normalized loop frequency response {circumflex over (X)}(f) for the acoustic transducer is defined as a ratio of a Fourier Transform of the Ve(t) to a Fourier Transform of the Vr(t). A wideband loop sensitivity SL(f) for the acoustic transducer is defined as an absolute square of the {circumflex over (X)}(f) in decibel.

Abstract: A power distribution unit comprising at least two conductors, a plurality of outlets, a plurality of indicator lights, an AC-DC conversion circuit, and a control circuit is provided. Each outlet is electrically coupled to two of the conductors. Each indicator light corresponds to one of the outlets. The input of the AC-DC conversion circuit is electrically coupled to two of the conductors. The control circuit is electrically coupled to the indicator lights and the output of the AC-DC conversion circuit. The control circuit is configured for sequentially driving the indicator lights, and is configured for controlling, according to the group information of each grouped outlet, a corresponding indicator light to display a corresponding color of a group to which the grouped outlet belongs.

Abstract: A method and/or an apparatus for determining the dynamic response of a microstructure is disclosed. A piezocomposite ultrasonic transducer device formed of a piezoelectric material and a polymer material around said piezoelectric ceramic material is used to provide a pulsed bulk acoustic wave having a bandwidth of at least 20% to excite a microstructure. The microstructure is attached onto the transducer, and the pulsed bulk acoustic wave generated through the transducer in response to a pulse voltage excites the microstructure to vibrate. Meanwhile, the dynamic response of the microstructure can be monitored by a laser Doppler vibrometer, and shown by an oscilloscope.

Abstract: A method and/or an apparatus for determining the dynamic response of a microstructure is disclosed. A piezocomposite ultrasonic transducer device formed of a piezoelectric material and a polymer material around said piezoelectric ceramic material is used to provide a pulsed bulk acoustic wave having a bandwidth of at least 20% to excite a microstructure. The microstructure is attached onto the transducer, and the pulsed bulk acoustic wave generated through the transducer in response to a pulse voltage excites the microstructure to vibrate. Meanwhile, the dynamic response of the microstructure can be monitored by a laser Doppler vibrometer, and shown by an oscilloscope.

Abstract: This invention discloses a composite ultrasonic therapeutic transducer, which comprises a piezoelectric ceramic having a positive electrode and a negative electrode, and a metallic housing, and is characterized in that the piezoelectric ceramic is formed with at least one recess which is open to the negative electrode attached onto the metallic housing. Thus, the transducer has a higher impedance and a wider bandwidth, and is easy to reach a well impedance matching with a driver.