Abstract: High-accuracy position signals are obtained by correcting nonlinear position sensitivities of two phase signals demodulated from two-phase servo information, into linear ones. A position sensitivity adjusting unit detects the signal level at the intersection of position signals N and Q having different phases by a predetermined track pitch which are demodulated from read signals of two-phase servo information buried and recorded in a disk medium and makes an adjustment of the gain of an AGC amplifier so that the intersection signal level coincides with a predetermined level. A sensitivity correcting unit corrects into linear position sensitivities the nonlinear position sensitivities approximated by sine functions or cosine functions relative to the actual track position X of the two position signals N and Q output from the AGC amplifier.

Abstract: A disk apparatus has a disk medium with sector areas that have a servo area and a data area along the same cylinder. The servo areas also have a sector mark indicative of the servo area, a code indicative of a cylinder address, and a predetermined servo pattern to detect a head position, all magnetically recorded in the servo area. A disk control section uses a head portion to detect the head position on the basis of a read signal of the servo pattern and positions the head portion at an arbitrary cylinder to perform reading and writing operations. The disk apparatus also has a time measuring counter for starting to measure an elapsed time each time a predetermined position in the servo area is detected, and a time setting register for storing a time from a detection time point of the predetermined position in the servo area to the generation of the sector pulse.

Abstract: A storage device includes: a read/write mechanism which is actuated in accordance with a selected one of two or more sets of control data so that a read/write operation is carried out to read data from or write data onto a recording medium; a detection unit for detecting a source voltage from a host system, and for detecting whether one of source voltages from the host system has been switched to another source voltage; a control unit for controlling the read/write operation of the read/write mechanism in accordance with the detected source voltage; and a reset unit for resetting the control unit to an initial condition when the switching from the one of the source voltages to the another source voltage is detected as being in process, so that the controlling of the read/write mechanism is withheld until the end of the switching.

Abstract: Two position signals N and Q having phases different by 90.degree. are demodulated from discrete readout signals of two-phase servo information through a position signal demodulating circuit. A level detecting circuit compares sizes of two position signals (absolute values) N and Q discretely available from the position signal demodulating circuit through seek operation at a certain speed. A cross-point C is calculated on the basis of two smaller discrete values Z and Y immediately prior to reversal of the size relationship of the two signals at the cross-point and a smaller discrete value X immediately after passage through the cross-point, and the thus calculated cross-point value C is set in an AGC amplifier as a reference amplitude value. The AGC amplifier adjusts the positional sensitivity to a certain value by amplifying the cross-point level of the two position signals N and Q so as to agree with the set reference amplitude value.

Abstract: For a balance adjustment due to a reduction in size and weight of an actuator, an arm portion, an axis attaching portion, and a coil supporting portion are arranged so that the centers of gravity on the coil side are located on a straight line connecting a rotational center and the center of gravity on the head side. Further, the improvement of an assembling efficiency of a VCM, an increase in torque, a one-touch fixing of an FPC connecting band, a noise prevention of a read pattern, and an insulation between the base and cover due to a bias of an MR read head are accomplished. A sector mark is detected by comparing a peak detection pulse and its reference polarity signal. A redundancy is provided to a reference detection polarity signal so that a read signal can be detected even if any one of the read signals of the sector marks is dropped out.

Abstract: Two-phase servo patterns are recorded on a servo area of a data medium of a data storage apparatus such that patterns Q+, N+, N- and Q- are recorded in the stated order, there being a phase shift of 90 degrees between position information N and position information Q.

Abstract: This invention provides highly thermally stable trehalose phosphorylases. The trehalose phosphorylases of the present invention can be obtained from cultured mixture of microorganisms and are highly thermally stable, and produce .alpha.-D-glucose 1-phosphate and D-glucose by an action on trehalose and an inorganic phosphoric acid or salt thereof, or trehalose by an action on .alpha.-D-glucose 1-phosphate and D-glucose. This invention also relates to the process for the preparation of trehalose phosphorylase, and trehalose or .alpha.-D-glucose 1-phosphate with said trehalose phosphorylase.

Abstract: A disk apparatus wherein a disk is rotated by a rotating motor, and a source power supplied to the rotating motor is monitored, which includes: a memory unit for storing an initial source voltage value before a process of a rotating motor acceleration is started; a detecting unit for periodically detecting a source voltage value related to the source power; a comparing unit for comparing the source voltage value, detected by the detecting unit during the process of the rotating motor acceleration, with the initial source voltage value stored in the memory unit, and for outputting a voltage fluctuation indicated by a difference between the source voltage value and the initial source voltage value; and a control unit for setting a quantity of the source power supplied to the rotating motor, to a smaller quantity in response to the voltage fluctuation output by the comparing unit.

Abstract: A process for producing trehalose from inexpensive saccharide raw materials via an enzymic method uses stable enzymes with high productivity. The process includes incubating a saccharide raw material and an inorganic phosphoric acid and/or a salt thereof in the presence of phosphorylase to produce .alpha.-glucose 1-phosphate, and contacting the produced .alpha.-glucose 1-phosphate with glucose in the presence of a trehalose phosphorylase to produce trehalose. The isolation and purification of trehalose is easier in comparison to conventional fermentation methods.

Abstract: A spindle sync control system for a plurality of magnetic disk drives connected in parallel to a host computer. The system is capable of reducing lost time and preventing a system from going down. The system includes a discriminator (25A) for discriminating the presence or absence of a reference index, a medium index and a Hall index; an offset calculator (25B) for calculating an offset value between the medium, index and Hall index before starting spindle sync control; a memory means (26) for storing the thus calculated offset value; a phase difference calculator means (25C) for calculating a phase difference between the reference index and the medium index; and a determination means (25D) for determining a driving control value for rotating a spindle motor (7) according to the thus calculated phase difference.

Abstract: In the present invention, an optically active cis type 1,2-diol derivative of the following formula (I) is produced by reacting a cis type 1,2-diol derivative of the formula (I) with a carboxylic acid derivative of the formula (II) in the presence of a lipase: ##STR1## wherein R.sup.1 and R.sup.2 independently represent hydrogen atom or an alkyl group, X represents a halogen atom, a nitro group, a cyano group, an alkyl group, a haloalkyl group, or a phenyl group, and n represents an integer of from 0 to 5; R.sup.3 represents a C.sub.1 -C.sub.10 alkyl group or an aryl group, and R.sup.4 represents a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group, a C.sub.2 -C.sub.4 alkenyl group, or COR.sub.3.The cis type means that the bond between the cyclopentane ring and the hydroxy group and the bond between the cyclopentane ring and the benzyl group reside in the same direction as that portrayed on the paper.

Abstract: This invention provides a process for producing an optically active 1,2-diol derivative by optical resolution. The optically active 1,2-diol derivative of the formula (I) which is capable of utilizing as an intermediate of fungicidal optically-active azole derivatives can be produced by esterifying a 1,2-diol derivative of the formula (I) as a substrate with a carboxylic acid derivative of the formula (II) as a reagent in the presence of a lipase as a catalyst. ##STR1## wherein R.sup.1 is C1-C5 alkyl group, C3-C7 cycloalkyl group or C1-C5 haloalkyl group, R.sup.2 is C1-C3 alkyl group substituted by a phenyl group which may have one or two halogen atoms and/or C1-C4 alkyl groups, C2-C3 alkenyl group substituted by a phenyl group which may have one or two halogen atoms and/or C1-C4 alkyl groups, or C1-C3 alkyl group substituted by a phenoxy group which may have one or two halogen atoms and/or C1-C4 alkyl groups, R.sup.3 is C1-C10 alkyl group or aryl group, and R.sup.

Abstract: A mechanical variation of a voice coil motor and an electrical variation of a servo loop are corrected, thereby performing a head positioning control of a high accuracy. When a measurement mode is set, a zero-cross frequency f.sub.0 at which a gain of open loop characteristics of the servo loop is set to 0 dB (gain =1) is known. By adding the frequency f.sub.0 to the servo loop, an open loop gain G.sub.OP is obtained. A correction coefficient K to set the open loop gain into an ideal value 0 dB (gain=1) is obtained as K=1/G.sub.OP and is stored into a correction table. In the ordinary access, a drive signal of an actuator is corrected by a correction coefficient K read out with reference to the correction table in accordance with the present cylinder position and the corrected drive signal is sent to the actuator.

Abstract: A data head offset detecting circuit in a magnetic disk unit includes a first offset detector that detects an offset .beta. based on servo information on a data surface read by the data head, a second offset detector that detects an offset .gamma. based on servo information on the servo surface read by the servo head, and an offset calculator for calculating a real offset .alpha. resulting from the subtracting of the offset .gamma. from the offset .beta.. By using the above circuit, an offset for a correction of an offtrack is detected accurately even when the heads are vibrating.

Abstract: Disclosed herein are derivatives of .beta.-(4-isocyano-1,2,3,4-diepoxycyclopentyl)acrylic acid, the derivatives showing an antibacterial activity, an antifungal activity and an antimycoplasmal activity.

Abstract: A novel antibiotic compoudn 3-(6-isocyano-3,7-dioxatricyclo[4.1.0.0.sup.2,4 ]hept-4-yl)propenoic acid is produced by a newly isolated microorganism belonging to the genus Penicillium.

Abstract: A novel antibiotic compound 3-(6-isocyano-3,7-dioxatricyclo[4.1.0.0.sup.2,4 ]hept-4-yl)propenoic acid is produced by a newly isolated microorganism belonging to the genus Penicillium.