摘要:
A vibration exciter machine has magneto striction elements (5,6) supported by a driven pile (2), for providing a vibration of up and down direction to the driven pile (2), and a drive circuit (D1) for controlling expansion and contraction movement of the magneto striction elements (5,6) by changing a supply time period of a current supplied to the magneto striction elements (5,6). By controlling of the drive circuit (D1) the supply time period of the current which flows in the magneto striction elements (5,6) is changed to control the expansion and contraction movement of the elements (5,7). Thereby a horizontal vibration component can be eliminated and only vertical vibration component can be transmitted to the driven pile material (2).
摘要:
A non-destructive examination device has an excitation current generation device for supplying an excitation current based on a control signal from a control device, a vibration excitor device for generating an elastic wave in accordance with athe excitation current and for vibrating an examination target to be examined by using the elastic wave; a response detection device (an acceleration sensor) for detecting a response of the vibration of the examination target caused by the elastic wave and for processing the response data in order to select desired examination information. The excitation current generation device generates the excitation current of an alternating pulse wave such as a pulse wave, or a rectangular wave, or a triangular wave, or a sine wave based on the control signal which is also a pulse signal. It can be acceptable to incorporate a plurality of the vibration excitor devices on the examination target in the non-destructive examination device.
摘要:
A nondestructive testing apparatus is provided with a wave transmitter by a metal-based magnetostrictive vibrator, a magnetically excited current feeding device for feeding the magnetically excited current to the magnetostrictive vibrator, a wave receiver for detecting an acoustic elastic wave propagating through the measurement object, a filter for extracting a signal in a target frequency band to be measured, and an automatically amplifying rate controlling function-equipped amplifier for automatically controlling the amplifying rate so as to obtain a given magnitude amplitude regardless of the magnitude of the reflection wave or the transmission wave detected by the wave receiver, which constitute a feedback loop. The apparatus is further provided with a signal processor for processing the signal detected by the above-described wave receiver, and a display device for displaying the process result obtained by the signal waveform detected by the above-described wave receiver or the above-described signal processor.
摘要:
An elastic wave generator includes an excitation coil, a magnetostriction oscillator around which the excitation coil is wound and an oscillator support. The excitation coil is wound around the oscillator, which is made of laminated magnetostriction sheets having a positive strain characteristic, in which length varies directionally upon magnetic excitation. The oscillator support has a first support surface bearing against a first end surface of the magnetostriction oscillator, intersecting the direction along which the length of the magnetostriction oscillator changes and a second support surface shrink-fit against a second end surface of the magnetostriction oscillator, intersecting the direction along which the length of the magnetostriction oscillator changes. Thus, the changes in the length of the magnetostriction oscillator due to the magnetic excitation of the excitation coil appearing at the first and second end surfaces is directly supported by the first and second support surfaces. The magnetostriction oscillator is shrink-fit by cooling so it may be placed between the support surfaces while cooled.
摘要:
An acoustic wave transmission system comprises an acoustic wave generating metal tubular member for converting information about the bottom of a borehole, which is obtained by a bottom hole sensor, into an acoustic wave. The acoustic wave generating metal tubular member includes a acoustic wave generating mechanism having at least a magnetostrictive oscillator which is mounted in a recess formed in an outer wall of the acoustic wave generating metal tubular member, and on which a compressive load is imposed by means of a pre-load mechanism using a vise. The magnetostrictive oscillator is constructed of a stack of thin plates each made of a metal magnetostrictive material having a property of increasing its dimensions when magnetized, the thin plates being bonded together by a heat-resistant adhesive. The magnetostrictive oscillator can thus have a buckling strength large enough to resist the compressive load imposed thereon by the pre-load mechanism and a stress due to a strain caused in itself. The acoustic wave generating metal tubular member further includes an excitation current supplier for supplying either a rectangular, sinusoidal, or triangular alternating excitation current modulated with the information about the bottom of the borehole and having a frequency that is half the carrier frequency of the acoustic wave, or a series of excitation pulses modulated with the information about the bottom of the borehole and having a pulse repetition rate that is equal to the carrier frequency of the acoustic wave, to an excitation winding wound around the magnetostrictive oscillator.
摘要:
An information transmitting apparatus using a tube includes a magnetostrictive vibrator to generate a first elastic wave depending upon underground information, a resonance tube body resonating with the elastic wave to generate a second elastic wave having a natural frequency, and a drill string to propagate the second elastic wave, thereby permitting a long transmission distance.
摘要:
There is disclosed a resist composition comprising at least: (A) a polymer containing one or more repeating units having a structure shown by the following general formula (1) and/or (2), an alkaline-solubility of the polymer being increased by an acid, (B) a photo acid generator generating, with responding to a high energy beam, a sulfonic acid shown by the following general formula (3), and (C) an onium sulfonate shown by the following general formula (4). There can be a resist composition showing not only excellent LWR and pattern profile but also extremely good performance in pattern-fall resistance, and to provide a patterning process using the same.
摘要:
A positive resist composition comprising a polymer comprising recurring units of a specific structure adapted to generate an acid upon exposure to high-energy radiation, recurring units of a lactone ring-containing structure, and acid labile units, all the recurring units being free of hydroxyl, can form a fine size pattern having a rectangular profile and improved collapse resistance.
摘要:
An accuracy of the sex determination which is visually inspected by human based on a reference drawing of an egg shape prepared for every parent chicken is insufficient and it takes much time to perform such a determination. Thus, the sex of the fertilized egg is determined by using parameters representing features developed on a surface shape of the above described fertilized egg which are quantified based on contour image data of the above described fertilized egg obtained by taking an image of the fertilized egg which is placed on a setting stand.
摘要:
A positive resist composition comprising (A) a polymer comprising recurring units of a specific structure adapted to generate an acid in response to high-energy radiation and acid labile units, the polymer having an alkali solubility that increases under the action of an acid, and (B) a sulfonium salt of a specific structure exhibits a high resolution in forming fine size patterns, typically trench patterns and hole patterns. Lithographic properties of profile, DOF and roughness are improved.