摘要:
A flow meter for detecting a flow speed in such a manner that an ultrasonic pulsed continuous wave is repeatedly transmitted toward an object at predetermined intervals T, a phase vector indicative of the phase of a reception signal due to the reflected wave is produced at the predetermined intervals, the phase difference between the present phase vector and the preceding phase vector is detected, and a Doppler frequency is calculated from the average value of a plurality of phase difference values to obtain the speed of the object. The phase difference values are classified into a first group consisting of position phase difference values and a second group consisting of negative phase difference values, the cosine and sine values of the central angle of the positive phase difference values and the cosine and sine values of the central angle of the negative phase difference values are calculated, and the argument of a vector indicated by the weighted sum of cosine values and the weighted sum of sine values is calculated to be used as an average phase angle.
摘要:
A ceramic electronic component having a structure in which thin film electrodes made of a Ni-Al system alloy or a Ni-Cr-Al system alloy are formed so as to make contact with a functional ceramic thin film.
摘要:
An apparatus for driving a magnetic head including a monolithic bimorph member. A first end of the monolithic bimorph member has the magnetic head fixed thereto, and the other end thereof is fixed to a support member to be supported by the support member. The monolithic bimorph member comprises a piezoelectric ceramic sintered body formed from a plurality of electrodes stacked alternately with ceramic layers. The plurality of electrodes includes first and second electrode groups which are electrically connected with each other by conductors in through holes. The through holes are provided in portions of the sintered body close to the end fixed to the support member.
摘要:
In an ultrasonic imaging apparatus, when a sampling time space determined corresponding to the respective phases of receiving signals from transducer elements adjacent to each other is shorter than the settling time of sample and hold circuits, these receiving signals are sampled at the same time. Noise is prevented from being mixed with the sample and hold values of these signals.
摘要:
A bulk wave piezoelectric device comprises a polarized ferroelectric ceramic plate, and electrodes formed on two main surfaces thereof, respectively, intersecting the polarization axis direction. The electrodes are connected to each other by means of an external resistance having a predetermined resistance value. The resistance value is selected to be smaller than the inherent resistance value of the ferroelectric ceramic plate between the two main surfaces. Positive and negative electric charges are stored on the two electrodes due to the pyroelectric effect responsive to a change of the temperature of the ferroelectric ceramic plate. The potential difference caused by the electric charges thus stored is rapidly decreased through the external resistance.
摘要:
A method for producing piezoelectric ceramics of a Pb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -PbTiO.sub.3 system is disclosed which comprises providing a piezoelectric ceramic composition expressed by the general formula:xPb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -PbTiO.sub.3wherein subscripts .alpha., x and y are mole fractions of the respective components and have the following values, x+y=1.00, 1/4.ltoreq..alpha..ltoreq.3/4, 0.01.ltoreq.x.ltoreq.0.40, and 0.60.ltoreq.y.ltoreq.0.99, forming powder of the composition into forming bodies, and firing the forming bodies in an oxygen atmosphere containing not less than 80 vol % of oxygen. The firing in the oxygen atmosphere is effected at a temperature not less than 1000.degree. C. A part of lead in the composition may be replaced with not more than 20 atomic percent of at least one metal selected from the group consisting of Ba, Ca, Sr and Cd. The composition may contain a small amount of Mn, Mg and/or Cr. Fine dense ceramics with low porosity, small average size and fine grain size are produced which can be applied to various electronic parts.
摘要翻译:公开了一种制备Pb(Sn-Sb-α)O3-PbTiO3系统的压电陶瓷的方法,该方法包括提供由通式xPb(Sn-Sb-α)O3-PbTiO3表示的压电陶瓷组合物,其中下标α, x和y是相应组分的摩尔分数,并且具有以下值:x + y = 1.00,1 / 4,α= 3 /4,0.01≤x≤0.40, = y <0.99,将组合物的粉末形成成型体,并在含有不少于80体积%氧气的氧气氛中焙烧成形体。 氧气氛中的烧成是在不低于1000℃的温度下进行的。组合物中铅的一部分可以用不大于20原子%的至少一种选自Ba,Ca, Sr和Cd。 该组合物可含有少量的Mn,Mg和/或Cr。 产生孔隙率低,平均粒径小,粒度细的细致密陶瓷,可应用于各种电子部件。
摘要:
A redundancy system for data communications upon two duplicate communication channels, each having transmission and reception circuits, characterized by a switching circuit for selecting one of said two communication channels, a single error detection circuit for detecting an error in the signal transmitted, and a control circuit for the switching circuit arranged to cause said two communication channels to alternately transmit signals when both the channels are in normal operation, and to cause one of said two channels to be selected when the other fails. The two channels share the error detection circuit and the control circuit and can therefore be built at a reduced cost and operated efficiently. Since the two channels are regularly checked for errors, they are operated with increased reliability.
摘要:
This high-strength cold-rolled steel sheet having excellent uniform elongation and hole expandability contains, C: 0.01 to 0.4%; Si: 0.001 to 2.5%; Mn: 0.001 to 4.0%; P: 0.001 to 0.15%; S: 0.0005 to 0.03%; Al: 0.001 to 2.0%; N: 0.0005 to 0.01%; and O: 0.0005 to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which at a sheet thickness center portion, an average value of pole densities of the {100} to {223} orientation group is 5.0 or less, and a pole density of the {332} crystal orientation is 4.0 or less, a metal structure contains 5 to 80% of ferrite, 5 to 80% of bainite, and 1% or less of martensite in terms of an area ratio and the total of martensite, pearlite, and retained austenite is 5% or less, and an r value (rC) in a direction perpendicular to a rolling direction is 0.70 or more and an r value (r30) in a direction 30° from the rolling direction is 1.10 or less.
摘要:
A conversion control unit sets a converting function of a write data conversion unit or a read data conversion unit enabled or disabled for each controller. Accordingly, for a controller which needs original external data, the external data can be inputted and outputted, whereas for a controller which needs converted internal data, the internal data can be inputted and outputted. A data converting function of a conventional controller can be realized in a semiconductor memory, which can reduce the load on the controller. As a result, the performance of a system can be improved. A disabled controller which has no access right cannot read correct data (original data before conversion). Hence, the security of data written into the semiconductor memory can be protected.
摘要:
A circuit board includes a substrate having a thickness in a first direction, extending in a plane perpendicular to the first direction, and having at least one of a through hole and a recess, and an optical transmission channel having an end thereof at a perimeter of the one of a through hole and a recess and having a portion thereof extending a predetermined distance from the end in a direction substantially perpendicular to the first direction, the portion being provided in the substrate or on a surface of the substrate.