摘要:
A safety device of the present invention for a storage battery includes a charge-discharge lead one end of which is connected to a positive electrode side of the storage battery and the other end of which is connected to a positive terminal of the storage battery; a pressure-sensing device which deforms in response to the increase of the pressure in the storage battery; and a cutting device for cutting the charge-discharge lead. The cutting device is pressed by the deformation of the pressure-sensing device to cut the charge-discharge lead.
摘要:
Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
摘要:
A cyclohexanone is oxidized by molecular oxygen in the presence of an aldehyde, a soluble compound of a metal selected from the group consisting of iron, palladium, vanadium, chromium, molybdenum, tungsten and cerium, and a compound which has a heterocyclic ring containing at least one nitrogen atom and which acts as a multidantate ligand, to form an epsilon-caprolactone and a carboxylic acid corresponding to the aldehyde.
摘要:
A method for producing an aldehyde, which comprises hydrogenating a carboxylic acid or its alkyl ester with molecular hydrogen in the presence of a catalyst, wherein (1) chromium oxide of high purity having a specific surface area of at least 10 m.sup.2 /g and a total content of sodium, potassium, magnesium and calcium of not more than 0.4 wt %, is used as the catalyst, and (2) the hydrogenation reaction is conducted while maintaining the carboxylic acid or its alkyl ester at a concentration of not more than 10 vol %.
摘要:
A method for producing a cycloolefin which comprises partially hydrogenating an aromatic hydrocarbon with hydrogen in a liquid phase in the presence of water and a catalyst having as main component ruthenium supported on a carrier, to form the corresponding cycloolefin, wherein an oxide with the total pore volume of pores having radii of from 20 to 100,000 .ANG. being from 0.3 to 10 cc/g and with the volume of pores having radii of from 20 to 200 .ANG. constituting at most 15% of the total pore volume, is used as the carrier for the catalyst.
摘要:
An anti-lock control device of a hydraulic brake system which enables a rapid building up of braking hydraulic pressure during normal braking but, once an anti-lock control is commenced, reduces the rise of the recovery of the braking hydraulic pressure so as to optimize the same for anti-lock control. The hydraulic braking system having a pneumatic pressure source, a brake valve, converting device for receiving the pneumatic pressure supplied from the pneumatic pressure source through the brake valve and converting the received pneumatic pressure into braking hydraulic pressure, wheel cylinders for receiving the braking hydraulic pressure, and pneumatic pressure control valves for controlling the pneumatic pressure in a pneumatic pressure chamber of the converting means so as to control the braking hydraulic pressure. The anti-lock control device has a comparator for comparing the pneumatic pressure in the pneumatic pressure chamber with the output pneumatic pressure of the brake valve, and an orifice valve which is put into a passage of pressurized air between the brake valve and the pneumatic pressure control valves when the comparator has judged that the pneumatic pressure in the pneumatic pressure chamber has come down below the output pneumatic pressure of the brake valve by a predetermined value. The orifice valve reduces the rate of rise of the pneumatic pressure in the pneumatic chamber so as to correspondingly reduce the rate of increase of the braking hydraulic pressure.
摘要:
The straight guide driving device comprises a guide rail fixedly attached to an immovable block such as the microscope body, a movable block such as a microscope tube block mounted so as to be displaced along the guide rail and a rack-pinion connection interposed between the immovable block and the movable block for driving the movable block. The rack-pinion connection has a pair of rack members which are fixedly attached to the movable block and arranged respectively in the vicinity of both the opposite sides of the guide rail. Accordingly, the movable block can perform straight movement with very high accuracy along the guide rail.
摘要:
Catalytic isomerization of 10 types of dimethylnaphthalenes, which are classified into four groups, can be carried out by using as a catalyst a zeolite defining the main pore opening consists of a ten-membered oxygen ring.
摘要:
Bisphenols are prepared by condensation of a phenol with a ketone in the presence of a sulfonic acid type cation exchange resin partially modified with a pyridinealkanethiol of the formula:Py--(CH.sub.2).sub.n SHwherein n is a positive integer and Py is 3-pyridyl when n is 1, or 2-, 3- or 4-pyridyl when n is more than 1.
摘要:
A sealed type battery is disclosed which can reduce variations in the operating pressure of a safety valve, improve the reliability for the airtightness of a battery vessel, remove the contact of electrode plates and the case due to the rightward or leftward deviation of a group of electrode plates in the direction of the winding shaft, remarkably reduce the internal short-circuiting production rate, and realize cost lowering or reduction in the number of working steps. The battery is equipped with a safety valve in which a cover plate having a hole, a metal thin plate and a holding plate of metal having a hole are stacked with the metal thin plate sandwiched and integrally fixed by laser welding. Further, the center line of the winding axis of a group of spiral electrodes is in parallel to the opening face of a battery case and the width of a separator in the direction of the winding axis is larger than the side of the opening portion of a angular tubular case in parallel to the direction of the winding axis.