摘要:
A substrate 1 for growing nitride semiconductor has a first and second face and has a thermal expansion coefficient that is larger than that of the nitride semiconductor. At least n-type nitride semiconductor layers 3 to 5, an active layer 6 and p-type nitride semiconductor layers 7 to 8 are laminated to form a stack of nitride semiconductor on the first face of the substrate 1. A first bonding layer including more than one metal layer is formed on the p-type nitride semiconductor layer 8. A supporting substrate having a first and second face has a thermal expansion coefficient that is larger than that of the nitride semiconductor and is equal or smaller than that of the substrate 1 for growing nitride semiconductor. A second bonding layer including more than one metal layer is formed on the first face of the supporting substrate. The first bonding layer 9 and the second bonding layer 11 are faced with each other and, then, pressed with heat to bond together. After that, the substrate 1 for growing nitride semiconductor is removed from the stack of nitride semiconductor so that a nitride semiconductor device is provided.
摘要:
A lens barrel 11 is mounted to a collapsible imaging device 1 having a zooming function and includes a cam frame 19, a first lens frame 39, a second lens frame 45, and a third lens frame 55. First, second, and third lens frame cam grooves 25, 27, 29, respectively including in the longitudinal direction thereof insertion parts 25a, 27a, 29a, collapse parts 25b, 27b, 29b, and variable power parts 25c, 27c, 29c are formed in the inner peripheral face of the cam frame 19. The third lens frame cam groove 29 are deeper than the first and second lens frame cam grooves 25, 27 and are intersected at the collapse parts 29c thereof with the respective insertion parts 25a, 27a.
摘要:
A signature log storing apparatus includes a signature log list and a certificate list, and registers, in the signature log list, a part of signature information in generated hysteresis signature as a signature record and a part of a user certificate in the certificate list. The signature log storing apparatus further includes a trust point list and validates a signature records registered in the signature log list and registers identification information for identifying a latest signature record out of the validate signature record, evidence information for validating validity of the user certificate for a validated signature record, and a hash value of information derived by connecting the evidence information and the hash value as needed or before the user certificate expires.
摘要:
Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding, to a fundamental sine wave current, a current having a frequency which is three times as high as that of the fundamental sine wave current. That is, IU=I·sin ωt+Ia·sin 3ωt: IV=I·sin(ωt+2/3π)+Ia·sin 3ωt: IW=I·sin(ωt+4/3π)+Ia·sin 3ωt Also, amplitude Ia of a current having a frequency which is three times as high as that of the fundamental sine wave current is set to a predetermined value smaller than amplitude I of the fundamental sine wave current.
摘要:
A novel enzyme which is useful in the optical resolution of D,L-pantolactone via D-selective asymmetric hydrolysis and a gene encoding the the same are provided. The invention discloses the gene coding for a natural D-pantolactone hydrolase (for example, one originating in Fusarium oxysporum) or proteins having an activity substantially equivalent thereto; host cells transformed with DNA containing a nucleotide sequence coding for said protein, processes for producing said protein via using said host cells and uses of said proteins and host cells.
摘要:
A decorative board comprising an inorganic substrate comprising an inorganic material other than a metal or a glass and having an organic or inorganic layer on a surface thereof, the substrate having consecutively thereon (1) a transfer base layer comprising a polyol-curing polyurethane resin, which is transparent or contains a colorant so as to have a color with hiding properties; (2) a transfer-printed layer having a pattern; and (3) a topcoat layer comprising a polyol-curing polyurethane resin.
摘要:
A process for the preparation of D-pantolactone, comprising employing specific microorganisms to convert D,L-pantolactone as the starting material into D-pantoic acid by selective asymmetric hydrolysis of the D-form only in the D,L-pantolactone, and then separating D-pantoic acid and converting it into D-pantolactone.
摘要:
A discrete-type repetitive control unit which enables stable repetitive control even if a state variable of a controlled object is not observable, using time delay elements (Z.sup.-1). The number of time delay elements is equal to or greater than a value obtained by dividing a cycle period of a cyclic target input by a period of sampling the deviation between a controlled object output and the cyclic target input. Periodically applied to each of the time delay elements is a sum obtained by adding the product of the deviation and a first gain (h1, - - - , hn) associated with the time delay element, to the product of an input (u(k)) of the controlled object and a second gain (m1, - - - , mn) associated with the time delay element, and to an output (Wn(n+n), - - - , W1(k+1)) of a preceding element. The control unit periodically applies to the controlled object a sum (u(k)) obtained by adding the product of the deviation and a third gain (h0) to an output (W1(k)) of the last time delay element. The control unit achieves a stable operation of the controlled object with the flexibility to respond to variation in the cycle period of the target input and without causing a delay in following the target input which periodically changes in a single changing pattern.
摘要:
A servo motor controlling method for controlling both speed and current of a servo motor under digital control. An integration gain unit (22) and a loop proportional gain unit (26) of the current controlling loop are subjected to correction by respective gain units (23, 27) so as to be increased depending upon the rotational speed of the servo motor. Since a current loop gain is increased depending upon the rotational speed of the servo motor, the oscillation of the current loop does not occur at the time of low speed drive and stop, and the shortage of torque due to the lowering of the current loop gain at the time of high speed drive can be prevented.
摘要:
An output torque of a servomotor is controlled to prevent overrun of an injection mechanism in an injection molding machine. The injection mechanism is driven by the servomotor to perform an injection operation of the injection mechanism. The injection molding machine includes a torque limit circuit which limits a value of a torque instruction output from a servo circuit of the injection mechanism operating in an injection direction to a value of a torque limit instruction from a numerical control apparatus and does not perform a torque limit operation of a drive instruction in a direction opposite to the injection direction. Therefore, the servomotor for driving the injection mechanism can be rapidly decelerated to prevent overrun of the injection mechanism.