Abstract: Disclosed are a method of producing p-hydroxyphenylalkanol of formula(I): wherein R1 and R2 independently represent hydrogen, an alkyl or a phenyl which may be substituted with an alkyl, or the like, R3, R4, R5, R6 and R7 independently represent hydrogen, an alkyl or the like and n denotes an integer from 0 to 7, the method being characterized in that a phenol compound of formula (II): wherein R1 and R2 respectively represent the aforementioned meaning, is reacted with an unsaturated alcohol of formula (III): R3R4C═C(R5)—C(R6)(R7)—(CH2)n—OH  (III) wherein R3, R4, R5, R6, R7 and n respectively represent the same as defined above, in the presence of (A) at least one compound selected from the group consisting of alkali metals, alkali metal compounds, alkaline earth metals and alkaline earth metal compounds and (B) at least one compound selected from the group consisting of transition metals and transition metal compounds, and the like.

Abstract: Disclosed are a method of producing p-hydroxyphenylalkanol of formula.

Abstract: A damper device has a magnet and at least two yokes facing the magnet across gaps. The magnet and the two yokes jointly provide a magnetic circuit such that a magnetic flux flowing from a first magnetic pole of the magnet is divided across one of the gaps into magnetic fluxes which flow into entrance sides of the yokes and back from exit sides of the yokes across another of the gaps into a second magnetic pole of the magnet. The two yokes are mechanically connected rigidly to each other, and a spring means elastically holds the one of the gaps between the first magnetic pole and the entrance sides of the yokes. One of the magnet and the yokes is adapted to be connected to a vibratable member. When the gaps are differentially varied in length by vibration of the vibratable member, the divided magnetic fluxes are changed to generate eddy currents in the yokes and the magnetic poles.

Abstract: A filter circuit is provided for two-axis signals which has good filtering characteristics such as steep filter characteristics in a narrow bandwidth without transformation from a stationary coordinate system into a rotating coordinate system and vice versa. Input signals related to orthogonal two axes are represented by a complex variable (U=Ux+jUy: Ux, Uy are respective quantities of Laplace transformation), and a transfer function of a lowpass or highpass filter of real coefficients is represented by F(s). A complex coefficient transfer function produced by replacing the Laplace operator “s” in the transfer function F(s) with “s−j&ohgr;” is represented by F(s−j&ohgr;).

Abstract: A method of controlling the axis S of a rotary member 1 is disclosed which comprises the steps of: (a) sampling an inclined angle .theta. and it's rate d.theta./dt of the rotary member; (b) in response to the angle .theta. and rate d.theta.

Abstract: An input signal related to x- and y-axes is expressed by a complex variable (U), a transfer function of a low-pass or high-pass filter having a real-number coefficient is represented by F(s), a central angular frequency, which may be either positive or negative, to be passed or rejected, is represented by .omega., an imaginary number unit is represented by j, and a complex coefficient transfer function produced by replacing "s" in the transfer function F(s) with (s-j.omega.) is represented by F(s-j.omega.). An output signal related to the x- and y-axes which is generated when the input signal U passes through the complex coefficient transfer function F(s-j.omega.) is expressed using a complex variable (V), producing a transfer expression formula:U.multidot.F(s-j.omega.)=VBoth sides of the transfer expression formula are multiplied by the denominator of F(s-j.omega.

Abstract: An inductance-type displacement sensor which can measure the displacement of a measured object of magnetic material without any contact with the object. A pair of series connected coils is provided adjacent to the object so that the inductance of the coils varies in response to a displacement of the object from a predetermined position. The inductance, the number of windings, the direction of the windings and the section of each of the cores are so set that the magnetic flux produced by one of the coils runs in a direction opposite to that of the magnetic flux produced by the other coil and the densities of the respective magnetic fluxes are identical with each other.

Abstract: An active magnetic bearing apparatus wherein an object designed to be suspended is supported by a plurality of active magnetic bearings and is suspended in a non-contact state so that the object is caused to move in either a rotational or reciprocating manner in such a state. The magnetic force of the respective active magnetic bearings is controlled electrically. A delay control mechanism is provided to cause a delay in the starting-up time for the respective active magnetic bearings so that these bearings are caused to start up sequentially when they are activated, thus making it possible to make the capacity of the power source as small as possible.

Abstract: An active type magnetic bearing system includes magnetic bearings for suspending a rotary body to permit it to rotate about its rotational axis. A control system supplies the magnetic bearings with signals to control the radial position of the rotary body, and comprises displacement detecting circuits for detecting any displacement of the radial position of the rotary body and a control circuit for producing a control signal which serves to suppress any unstable vibration of the rotary body.

Abstract: A flywheel assembly has a base and a flywheel rotatable with respect to and in contact free relation with the base. First and second annular yokes are secured to the base coaxial with the flywheel, and coupled to each other by radially extending control poles. Control coils are wound around the poles. An annular magnet is mounted on the first yoke, coaxial therewith, and a third annular yoke is mounted on the magnet. An outer cylindrical yoke is secured to the flywheel at the outside of the first yoke, and an inner cylindrical yoke is fixed to the flywheel at the inside of the second yoke. The cylindrical yokes are coupled to each other by an annular yoke. A magnetic flux from the magnet flows through the magnet, third yoke, outer cylindrical yoke, first yoke, and the magnet, thereby controlling the axial position of the flywheel.