摘要:
Polymer compositions containing repeating units from 0 to 95 mol percent of aromatic dicarboxylic acids containing 8 to 16 carbon atoms and having at least three carbon atoms between carboxyl groups or esters thereof, repeating units from 0 to 95 mole % 1,4-cyclohexanedimethanol, repeating units from 5 to 100 mol % trimellitic acid or anhydride, and repeating units from 5 to 100 mol % 4-(aminomethyl)cyclohexanemethanol, and wherein the mol % of the repeating units from the trimellitic acid or anhydride does not exceed the mol % of repeating units from the 4-(aminomethyl)cyclohexanemethanol.
摘要:
The polyesters of trans-4,4'-stilbenedicarboxylic acid, 5-95 mol % 1,4-butanediol, and 95-5 mol % 1,6-hexanediol can be injection-molded to give shaped objects having exceptionally high tensile strength and stiffness. Many of the copolyesters of this invention have excellent chemical resistance and good hydrolytic stability. The copolyesters can be injection-molded, spun into fiber, or extruded into film having these properties.
摘要:
The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95-60 mol % 1,6-hexanediol, and 5-40 mol % ethylene glycol can be injection-molded to give shaped objects having exceptionally high tensile strength and stiffness. Many of the copolyesters of this invention have excellent chemical resistance and good hydrolytic stability. The copolyesters can be injection-molded, spun into fiber, or extruded into film having these properties.
摘要:
The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95 to 50 mol % 1,4-butanediol, and 5 to 50 mol % 1,4-cyclohexanedimethanol can be injection-molded to give shaped objects having exceptionally high tensile strength and heat resistance. Many of the polyesters also have excellent hydrolytic stability and chemical resistance. The polyesters of this invention can be molded, extruded into film, or spun into fibers having these properties.
摘要:
Polymer compositions containing repeating units from 0 to 95 mol percent of aromatic dicarboxylic acids containing 8 to 16 carbon atoms and having at least three carbon atoms between carboxyl groups or esters thereof, repeating units from 0 to 95 mol % 1,4-cyclohexanedimethanol, repeating units from 5 to 100 mol % trimellitic acid or anhydride, and repeating units from 5 to 100 mol % 4-(aminomethyl)cyclohexanemethanol, and wherein the mol % of the repeating units from the trimellitic acid or anhydride does not exceed the mol % of repeating units from the 4-(aminomethyl)cyclohexanemethanol.
摘要:
Disclosed are blends of polyesters of terephthalic acid, trans-4,4'-stilbenedicarboxylic acid, and bisphenol A polycarbonate. The polymers are compatible, and blends prepared from these polymers have excellent impact strength and are useful as molding plastics, fibers, and films.
摘要:
Disclosed are liquid crystal copolyesters prepared from an aromatic dicarboxylic acid, a substituted hydroquinone and resorcinol. These copolyesters contain the following divalent radicals: ##STR1##
摘要:
A feedforward compensator for induced vibration is disclosed. Controlled motions in an actuator induce mechanical disturbances in a surrounding cabinet. The feedforward compensator allows such disturbances to be compensated for without the need of a vibration sensor. The compensator provides a feedforward compensation signal configured to compensate for a mechanical disturbance predicted to be induced by a controlled motion of the actuator, and applies the feedforward compensation signal to a signal that controls the motion of the actuator.
摘要:
A method and system for providing plant variation compensation for a microactuator in a dual-stage servomechanism of a disc drive. The method includes performing indirect adaptive filtering to identify plant variation in the microactuator, and tuning a compensator for the microactuator based on the plant variation. The indirect adaptive filtering can be performed using a two-stage process, including a first stage of adaptive modeling for the dual-stage servomechanism and a second stage of generating an indirect mode-reference inverse for the microactuator. A combined process can alternatively be employed. The microactuator can be a piezoelectric microactuator which forms a PZT system. The dual-stage servomechanism also includes a coarse actuator such as a voice coil motor.
摘要:
A method of implementing a model based servo controller in a digital signal processor in a disc drive includes obtaining matrices for a discrete-time state-space realization of the servo controller. Controller states of the controller are scaled to reduce a worst case bound on the controller states. The controller states are transformed to a desired format which reduces a number of required mathematical operations. Further, the matrices are converted to fixed point format.