摘要:
A method and apparatus for monitoring cracks of a rotatable body by detecting cracks by measuring accoustic emission signals and evaluating the depth of cracks from the result of the comparison of assumed vibrations of the rotatable body and its measured vibrations. By this method and apparatus not only the beginning of cracking of the rotatable body, but also the progress of cracking on an online basis can be detected and monitored.
摘要:
Disclosed is a method for detecting the condition of a crack generated in a rotor of a rotary machine during an operation thereof to check whether the crack is developing or not. The number of revolutions of the rotor and oscillations of journal end portions of the rotor born by the bearings are continually detected. The detection of the crack condition is made on the basis of the detected signal corresponding to the waveform of each half of at least one cycle of the detected rotor oscillation. Disclosed also is an apparatus for carrying out the method.
摘要:
This invention relates to a magnetic disk apparatus equipped with magnetic bearings for supporting a spindle without contact by a magnetic attracting or repulsing force. The magnetic disk apparatus prevents occurrence of oscillation of magnetic disks and accomplishes high accuracy positioning.
摘要:
A device for identifying an acoustic sound producing location in an axial direction of a rotating body by using an acoustic signal and a rotational pulse signal. In the device, a rubbing location identifying signal is provided in synchronism with the rotational pulse signal in which the pulse interval corresponds to the distance between acoustic sensors or a rotor length. A phase of a peak in a rubbing location identifying signal as measured with respect to the pulse represents an acutal rubbing location.
摘要:
This invention provides a process for producing a vinylated nucleic acid in an efficient and cost-effective manner through the implementation of vinylation of an amino-containing nucleic acid with a vinylating agent. This invention also provides a process for producing a vinylated nucleic acid in an efficient and cost-effective manner by a method in which PCR is carried out in the presence of an amino-modified nucleotide and dNTP and a vinyl group is introduced into the resulting PCR amplification product or by a method in which PCR is carried out in the presence of a vinyl-modified nucleotide and cNTP.
摘要:
A managing computer adds a bulk-sales negotiation ID to a bulk-sales negotiation to distinguish the bulk sales negotiation from a normal sales negotiation. An amount of scheduled shipment and completed shipment for the bulk sales negotiation is managed by a bulk-sales-negotiation managing unit based on the bulk-sales negotiation ID. The managing computer obtains an amount of completed shipment of a regular negotiation by subtracting an amount of completed shipment of the bulk-sales negotiation from a total amount of completed shipment. The managing computer calculates a seasonal index based on an amount of completed shipment according to a stratification of products to design a sales plan. The managing computer adds an amount of schedule shipments of the bulk sales negotiation to the sales plan.
摘要:
An oil feeding device for a scroll fluid apparatus. A fixed scroll member is associated with an orbiting scroll member. A crankshaft rotatably supported by a bearing of a frame has a crank portion engaging with a plain bearing of the orbiting scroll member. A variable speed driving motor is connected to the crankshaft. An oil feeding passageway is provided in the crankshaft and the crank portion. Oil is supplied to the plain bearing of the orbiting scroll member through a space at the end face of the crank portion. An oil flow passage is provided in parallel with the axis and in a surface of the crank portion located at a position advanced through approximately 45 degrees toward the rotational direction of the crank portion, from a position at which the load acting radially of the shaft due to the centrifugal force caused by the orbiting motion of the orbiting scroll member is applied to the crank portion of the shaft.
摘要:
A turbo vacuum pump for compressing a low-pressure gas to discharge the compressed gas into atmosphere comprises pump stator having a gas flow passage comprising a plurality of annular flow passages on an inner surface thereof arranged stepwise diameters of which become smaller toward downstream and passages intercommunicating with adjacent annular flow passages and a gas discharge port communicated with one of the plurality of annular flow passages disposed at the most downstream. The pump stator includes a cylindrical spiral grooved pump impeller and a plurality of peripheral flow pump impellers facing the annular flow passages provided downstream of the cylindrical spiral grooved pump impeller and having stepwise diameters which become smaller toward downstream to form a peripheral flow pump stage. The suction casing has a spiral groove on a cylindrical inner surface thereof arranged with a predetermined clearance in relation to the spiral grooved pump impeller of the pump rotor so as to form a spiral grooved pump stage and a gas suction port communicated with the spiral grooved pump stage.
摘要:
There is disclosed a process for producing 7,7,8,8-tetracyanoquinodimethane, which comprises subjecting 1,4-bis-(dicyanomethylene)-cyclohexane to anodic oxidation in a solvent.
摘要:
An impeller of a centrifugal blower includes a hub, a hub plate, a plurality of blades and a shroud. The hub plate has an outer diameter which is smaller than an inner diameter of the shroud and a portion of the blades existing in the difference between the diameters is provided with a parting plane of molds, whereby the impeller can be integrally molded by the injection molding.