摘要:
A titanosilicate catalyst and method for preparing the same, comprising primary titanosilicate particles which are combined with one another, wherein the titanosilicate catalyst comprises pores having a pore diameter of from 50 to 300 .ANG.. The inventive catalyst exhibits activity in a hydroxylation reaction of an aromatic compound, or an epoxidation reaction of an olefin, or an ammoximation reaction of a ketone using hydrogen peroxide as an oxidant.
摘要:
Phenols are reacted with a hydrogen peroxide in the presence of a crystalline titanosilicate catalyst and a cyclic ether, such as dioxane, as a solvent. The method provides especially high para-selectivity compared with conventional methods, and, at the same time, provides high yields of dihydric phenols versus hydrogen peroxide.
摘要:
A method for manufacturing a disk for a belt-driven continuously-variable-speed drive of the type which includes a metal belt disposed in engagement between mutually facing sheave surfaces which form a V-groove, including the steps of machining each sheave surface with a numerical control lathe to form therein a spiral groove that is centered about the center of the pulley and has a surface roughness within the range of 0.8-0.4 microns, and thereafter super finishing the sheave surfaces to produce residual stress therein.
摘要:
A document filing apparatus is provided with a main unit for outputting parallel bit data, and a display device coupled to the main unit through an interface cable having a plurality of bit transmission lines. The display device comprises a multiplier circuit for multiplying the frequency of a clock pulse at a predetermined frequency, a parallel-in/serial-out shift register for receiving an image signal obtained by finely scanning a document, via the interface cable, as parallel image data, and for converting the parallel image data into serial image data in synchronism with a multiplied clock pulse signal from the multiplifer circuit, and cathode-ray tube for displaying image data obtained from the shift register as an image.
摘要:
A concealable wiper apparatus for a vehicle has a wiper assembly disposed in such a manner that the wiper assembly can be accommodated in an accommodating chamber provided inside the body of the vehicle and in the vicinity of a window glass. The wiper assembly is vertically moved between an accommodated position at which it is accommodated in the accommodating chamber and a raised position at which the wiper assembly wipes the window glass. In addition, a wiper arm which supports a wiper blade that wipes the window glass is adapted to be capable of expansion and contraction. Accordingly, when the wiper is not used, the wiper apparatus is accommodated in the accommodating chamber, so that it is possible to minimize the air resistance to the vehicle and reduce the size of the accommodating chamber.
摘要:
An abnormal feed condition-detecting apparatus for a printing device in which sheets are delivered one by one from a feeder to the printing section at the prescribed time interval, the detecting apparatus comprising a first paper passage detector disposed near the fender and a second paper passage detector positioned near the outlet port of the printing device and being designed to detect the passage of the respective succeeding sheets on the prescribed length of time, and, in the occurrence of an abnormal feed condition, sending forth an abnormality signal only after all the sheets delivered from the feeder before the detection of the abnormal feed condition have been drawn out of the printing device.
摘要:
A process for obtaining a polyol-containing homogeneous liquid composition, which can be directly reused as a polyol component for the production of rigid polyurethane foam, from a rigid polyurethane foam, which comprises treating said foam at a temperature of from 150.degree. to 220.degree. C in the presence of a mixture of (a) an aliphatic diol having 4-7 carbon atoms and having a boiling point higher than 160.degree. C and (b) a monoalkanolamine having 2 to 8 carbon atoms, the amount of said monoalkanolamine (b) present in said mixture being within the range of from 1 to 20 percent by weight.