摘要:
For the purpose of removing an effect of window processing in window-processing time-domain Doppler signals, translating them to a frequency domain, and then translating them back to the time domain, when cutting signals of a predetermined length from a time-domain Doppler signal; performing window processing on the cut signals; transforming the window-processed signals into frequency-domain signals by Fourier transformation; inversely transforming the frequency-domain signals by inverse Fourier transformation into a time-domain signal after performing predefined processing on the signals; and outputting the time-domain signal as an acoustic signal, the window processing is performed using a window having a profile with a flat top; and the cutting from the Doppler signal is performed such that a former cut signal and a latter cut signal overlap in a portion corresponding to the flat portion of the window.
摘要:
In order to make both the maintenance of a scan range and a frame rate for ultrasonic imaging and high definition of an image compatible with each other, a sound-ray density for scan is made nonuniform, and a sound-ray density is rendered dense at a required portion and coarse at portions other than the portion.
摘要:
A digital phase shifting apparatus wherein the phase of a train of sampled digital-data is changed by a fine step shorter than a sampling period using a sampling signal with a fixed phase or a clock signal, the apparatus comprising:a memory unit for storing the time-axis train of sampled digital data one after another at addresses corresponding to sampling times;a memory read device for reading out digital data sampled at times ahead of a current sampling time by desired time differences from the memory unit one sampled data after another in synchronization with an operation to sample the time-axis train of sampled of digital data;registers for holding sampled digital data read out from the memory unit, from a most recently read data to a data ahead of the most recently read data sampled data by a predetermined piece count; andan interpolated-data generating device for summing up a plurality of sampled data held in the registers with a weight applied to each of the data to generate interpolated data at a desired arbitrary point of time within sampling intervals of the sampled digital data held in the registers.
摘要:
An ultrasonic contrast imaging method includes: a contrast medium destroying step of transmitting an ultrasonic wave for destroying a contrast medium in a portion close to an ultrasonic probe; and an imaging step of acquiring an ultrasonic image after destruction of the contrast medium in the portion close to the ultrasonic probe.
摘要:
The scanning lens unit includes lenses located between a optical deflector and a lens having a k-th lens surface Sk from a first lens surface S1 closest to the deflector are disposed such that a height of a lens having the lens surface Sk denoted by πk satisfies the predetermined expression. each of lenses located between the first lens surface S1 and the k-th lens surface Sk is a cylindrical lens having power only in the determined deflection direction. Therefore, the lenses can individually have minimum thicknesses, as a result, the cost reduction of the scanning lens unit is realized. The optical scanning apparatus includes the scanning lens and hence can achieve cost reduction.
摘要:
A first fθ lens is arranged to form an inclination angle α1 to a main scanning plane. A second fθ lens is arranged to form an inclination angle α2. In order to determine the inclination angles α1 and α2, curvature amounts of scanning lines generated on a scanned surface are measured when the fθ lenses are independently inclined one at a time at a minute angle. Change rates K1 and K2 are obtained from the measured curvature amounts and the minute angles. The inclination angles α1 and α2 are determined such that |K1 α1+K2 α2| is no more than a certain value.
摘要翻译:第一透镜被配置成与主扫描面形成倾斜角α1。 第二个透镜被配置成形成倾斜角α2。 为了确定倾斜角α1和α2,当透镜独立地以一个微小的角度一次倾斜时,测量在扫描表面上产生的扫描线的曲率量。 从测量的曲率量和微小角度获得变化率K 1和K 2。 倾斜角α1和α2被确定为使得| K 1α1 + K 2α2 | 只不过是一定的价值。
摘要:
A method for preparing urea grease excellent in low noise properties comprises the step of adding a base oil in which an amine (or an isocyanate) is dissolved or dispersed, to a base oil in which an isocyanate (or an amine) is dissolved or dispersed, in the form of liquid drops having a diameter of not more than 300 .mu.m to react the isocyanate with the amine; or the step of directly contacting liquid drops comprising a base oil in which an isocyanate is dissolved or dispersed and having a diameter of not more than 300 .mu.m with liquid drops comprising a base oil in which an amine is dissolved or dispersed and having a diameter of not more than 300 .mu.m to react the isocyanate with the amine. The method permits the production of urea grease excellent in low noise properties at a low cost.
摘要:
A grease composition for high-temperature, high-speed and high-load bearings comprises (i) a lubricating base oil composed of an alkyldiphenyl ether lubricant as an essential ingredient and having a kinematic viscosity of 90-160 cSt at 40.degree. C., and (ii) 22-30 wt. %, based on the grease composition, of a diurea compound as a thickener. The diurea compound is represented by the following formula: ##STR1## wherein R.sub.2 means an aromatic hydrocarbon group having 6-15 carbon atoms, R.sub.1 and R.sub.3 denote an aromatic hydrocarbon group having 6-12 carbon atoms or a linear alkyl group having 8-20 carbon atoms, and the proportion of aromatic hydrocarbon groups in R.sub.1 and R.sub.3 is 70-95 mole %. The NLGI thickness grade of said composition is in a range of from No. 1 to No. 3.
摘要:
The ribbon-type loudspeaker that has the characteristics of large cooling effect such that electrical input power is increased. The ribbon-type loudspeaker comprises magnet means having plates positioned in facing relation to each other to form a gap therebetween; an electrically conductive diaphragm extended between said plates to complete a magnetic circuit, said diaphragm forming an electric circuit transversely of said magnetic circuit, at least one side of said diaphragm being formed with an electrically insulating layer; and a heat absorbing plate extended between said plates and attached in contacting relation thereto over an extended area, said heat absorbing plate being formed with an electrically insulating layer in facing relation to the electrically insulating layer of the diaphragm.
摘要:
The present invention provides a method for manufacturing a membrane electrode assembly which improves the reliability of seal, mechanical strength, and handling ability of a solid polymer type fuel cell. The manufacturing method includes: preparing a membrane electrode assembly which differs in the size of the gas diffusion layers at the anode side and the cathode side; and providing a resin frame at the outer peripheral edge of the membrane electrode assembly by molding; wherein the molding includes the use of a mold that keeps penetration of the resin frame material into the gas diffusion layers and/or electrode layers to a minimum and prevents warping of the outer peripheral edges.