摘要:
A sound field measuring device according to the present invention uses a measurement signal which has at least one change point and whose frequency spectrum has a shape corresponding to a shape of a frequency spectrum of a background noise. This enables a sound field measurement, which is for measuring an impulse response or transfer function of a sound field space which is a linear time-invariant system to be measured, to be performed with a high S/N ratio over a wide frequency band.
摘要:
A sound field measuring device uses a measurement signal which has at least one change point and whose frequency spectrum has a shape corresponding to a shape of a frequency spectrum of a background noise. This enables a sound field measurement, which is for measuring an impulse response or transfer function of a sound field space which is a linear time-invariant system to be measured, to be performed with a high S/N ratio over a wide frequency band.
摘要:
A reactive-species supply device is configured to supply a treatment gas to an electric discharge space that is formed by at least one pair of electrodes, for thereby supplying at least a reactive species formed in a plasma, to an object through a reactive-species output port. The reactive-species supply device includes (a) a reactive-species outlet passage disposed between the electric discharge space and the reactive-species output port and (b) an earth ground member disposed in a portion of the reactive-species outlet passage. The portion of the reactive-species outlet passage is distant, by a given distance, from the reactive-species output port. Also disclosed is a surface treatment apparatus that includes the reactive-species supply device.
摘要:
A sound field control apparatus appropriately presenting desired sound in a listening area and sufficiently reducing the sound in a nearby area without constraint on configuration arrangement includes: a listening compensation filter processing a signal from a sound source using a control characteristic and outputting the signal to a second speaker; and a control filter processing the signal from the listening compensation filter using a control characteristic and outputting the signal to a first speaker. The characteristic of the control filter is a first previously-set characteristic whereby reproduced sound from the second speaker is reduced by reproduced sound from the first speaker at a first control position. The characteristic of the listening compensation filter is a second previously-set characteristic whereby sound having a predetermined target acoustic characteristic is presented by reproduced sounds from the first and second speakers at a second control position.
摘要:
To provide a light source which realizes accurate determination of the particle density of a plasma atmosphere without disturbing the state of the plasma atmosphere.The light source of the invention includes a tubular casing 12; a cooling medium passage 30 for causing a cooling medium to flow therethrough, the passage being provided along the inner wall of the casing; a lens 50 provided at a tip end of the casing; a first electrode 44 and a second electrode 45 which are provided in the casing and before the lens so as to be vertical to the axis of the casing and parallel to each other; and an insulating spacer 46 provided between the first electrode and the second electrode. The light source further includes a hole 47 axially penetrating the center portions of the first electrode, the insulating spacer, and the second electrode; and an electric discharge gas passage for introducing an electric discharge gas, along the inner wall of the cooling medium passage, to the back surface of the lens so that the electric discharge gas is reflected by thepslens and flows through the hole.
摘要:
A noise control device includes: four or more noise detectors each for detecting a plurality of noises arriving thereat, and outputting the noises as a noise signal; a control speaker for radiating, to a control point, a control sound based on each noise signal; and a filter section for signal-processing noise signals from the noise detectors by using filter coefficients which respectively correspond to the four or more noise detectors and which are set such that the control sound from the control speaker reduces the plurality of noises arriving at the control point, and for adding up all the signal-processed noise signals, and for outputting a resultant signal to the control speaker. The control point and the control speaker are provided within a polyhedral-shaped space whose apexes are placement positions of the noise detectors.
摘要:
After placing inside a reactor second container a substrate to which a CNT not yet carrying a catalyst is adhered under a sealed environment of supercritical carbon dioxide through which a Pt catalyst complex is dispersed, a temperature of the supercritical carbon dioxide is maintained below a decomposition temperature of the Pt catalyst complex, and a temperature of the CNT not yet carrying a catalyst is maintained at or above the decomposition temperature of the Pt catalyst complex by heating the substrate. Further, a pressure of the supercritical carbon dioxide is maintained at 7.5 MPa, which is slightly higher than a supercritical pressure (7.38 MPa) of carbon dioxide. The supercritical carbon dioxide is then caused to contact the CNT adhered to the substrate, and as a result, a Pt catalyst is carried on the CNT.
摘要:
A speaker (10) includes: a speaker unit (20); a passive radiator (50x) in front of the speaker unit (20); and a cabinet (30) storing the speaker unit (20) to cover a rear space behind the speaker unit (20) to seal a space (30x) between the speaker unit (20) and the passive radiator (50x). An effective piston area (50L) of the passive radiator (50x) is larger than an effective piston area (20L) of the speaker unit (20).
摘要:
To provide a plasma generator having a plasma-generating zone of an increased volume.A plasma generator 100 has a casing 10 made of a sintered ceramic produced from alumina (Al2O3) as a raw material. The casing 10 has a slit-like gas intake section 12, and a gas discharge section 20 in which a plurality of holes are disposed in a line. From the gas intake section 12 to the top of a plasma-generating zone P, the slits have a width of 1 mm. There is provided a second gas discharge section 22 including holes 24 which have a diameter of 0.5 mm and a length of 16 mm and which are arranged in a line along the longitudinal axis of the plasma-generating zone P. The plasma-generating zone P has a cross-section which is a rectangle having a side of 2 to 5 mm. Electrodes 2a, 2b are provided with hollow portions on the surfaces thereof facing each other. A power sources supplies about 9 kV, which is obtained by boosting 100 V (60 Hz) and is applied to the electrodes 2a, 2b with a current of 20 mA. When argon gas is supplied through a gas intake section 12, a plasma was generated, even when the electrodes 2a, 2b were separated at a maximum spacing of 4 cm. No electric discharge was generated between the tips of the holes 24 and a treatment object.
摘要:
To achieve an apparatus capable of measuring a light absorption coefficient f a sample with high sensitivity. A ring down spectroscope uses a wavelength-variable femtosecond soliton pulse light source 1. Pulse light is input to a loop optical fiber 6 through a first light waveguide 4 and a wavelength selective switch 5. Ring down pulse light is input to a homodyne detector through the wavelength selective switch 5. On the other hand, pulse light propagating in the first light waveguide 4 is split and input to light waveguides constituting a second light waveguide 20 through an optical directional coupler 8 and a first optical switching element 12. The pulse light propagating in the second light waveguide 20 is input to the homodyne detector as reference light and used for synchronous detection. The plural light waveguides constituting the second light waveguide 20 differ in optical length in accordance with the length of the optical fiber 6, and can slightly change the optical length.