Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.

Abstract: A reduction gear mechanism applicable for a geared motor used for lifters for business equipment or the like. A trochoid tooth profile internally meshing type planetary reduction gear mechanism is used as the basic reduction gear mechanism. Each of an external gear and an internal gear is formed of a resin having a small rigidity. Each of an output shaft and a bearing supporting the external gear is formed of a metal having a large rigidity. As a result, the reduction mechanism ensures the rigidity and rotational smoothness in usual operation. Moreover, when a torque more than a value required for a mating member to be driven is applied, the external gear and internal gear are deformed, resulting in the increased meshing loss. The reduction mechanism can reduce the efficiency mechanically by the increase in the meshing loss. Even if a reversing load is applied from the output shaft side, the efficiency can be also reduced by the same meshing loss.

Abstract: A door includes an apparatus for reducing smoke associated therewith. The door is particularly advantageous in reducing smoke in a fire to thereby allow a firefighter or a victim trapped in a fire to readily indentify an exit. The door includes a nozzle or plurality of nozzles mounted upon the door, with a liquid source connected to the nozzle. Preferably, the door additionally includes a supply of pressurized water therein, with a surface active agent in an amount of 0.

Abstract: Disclosed is an exhaust gas purifying apparatus for an automobile diesel engine including a pair of electrodes disposed at a predetermined interval in an exhaust path of an automobile diesel engine, and a high voltage power source for applying a high voltage to the pair of electrodes whereby an electric field is generated in a space between the pair of electrodes so as to collect diesel particulates. Since the diesel particulates emitted from a diesel engine are charged heavily in negative, and since the exhaust gas purifying apparatus forms an electric field between the pair of electrodes, the diesel particulates are collected on one of the pair of electrodes.

Abstract: Disclosed are a process for laminating a functionally gradient material and a laminating apparatus for the same. The process therefor includes a suspending step and a functionally gradient material laminating step. In the functionally gradient material laminating step, solid-liquid separation is carried out to a suspension while varying the mixing rates of the suspension particles contained therein continuously or in a multi-staged stepwise manner. Therefore, the functionally gradient material layer thus laminated offers a composition gradient varying continuously or in a multi-staged stepwise manner in the thicknesswise direction thereof in a superior continuity, and the composition fluctuates less in the planewise direction thereof. In addition, the process and the laminating apparatus have obviated the atomizing and the spraying which adversely affect a working environment.

Abstract: A self-excited inverter circuit primarily includes a main transformer two switching elements e.g. the first and second (FET) switching elements, wherein capacitors at both ends of said first FET are charged during a time T.sub.1 -T.sub.2 when said first FET is turned off, and the voltage V.sub.g1 across said first FET is clamped by a charge voltage V.sub.c1 and then, a voltage V.sub.gs is applied across the gate and the source of said second FET for electrical continuity to cause the voltage to be clamped. The clamped state is maintained from T.sub.1 to T.sub.2, the saturation reactor is saturated at time T.sub.3, and V.sub.gs, which has been negative, starts to change toward O, thereby causing the first FET to change to ON; V.sub.q falls towards VPi at TP3 and further towards zero point. Thus, the voltage V.sub.q2 changes to zero to cause V.sub.gs of the second FET to become zero and the second FET to be shut off. When said voltage V.sub.q2 is clamped to a fixed value, a high -V.sub.

Abstract: A pneumatic radial tire having an improved bead portion reinforcing construction is disclosed. The radial tire comprises a bead portion reinforcing band disposed along the bead portion formed by folding the ply of the carcass body around the bead ring. The bead portion reinforcing band comprises at least one chipper layer. The chipper is composed of a reinforcing element embedded in rubber and formed of 1 to 50 helically formed filaments. The reinforcing element has a modulus of elasticity of 0.029.times.10.sup.4 kg/mm.sup.2 to 1.60.times.10.sup.4 kg/mm.sup.2 and is inclined at a given angle with respect to the ply cords of the carcass body so as to make the chipper as a whole extensible and rigid.

Abstract: A radial tire provided with a tread pattern suitable for travel on paved roads at a high speed is disclosed.The tread pattern is of a block-rib type which is constructed to satisfy the following conditions, i.e.(1) W.sub.1 =(5-9%) TW(2) W.sub.2 =(0.5-2.5%) TW(3) 60% BW.gtoreq.A and A.gtoreq.20% TW(4) B.sub.2 =(1.0-2.0) B.sub.1where W.sub.1 is a width of a wide circumferential groove, TW is a tread width, W.sub.2 is a width of a narrow circumferential groove, BW is an effective width of a belt, A is a width of a tread center portion, B.sub.1 is a tread side portion facing the tread center portion and B.sub.2 is a tread side portion facing two shoulder portions.

Abstract: A heavy duty pneumatic radial tire having tread patterns divided into a central zone and peripheral zones by two main continuous zigzag grooves spaced apart a distance 25-38% of the overall width of the tread and having a main groove oblique or zigzag angle of 55-78.degree. relative to a radial plane of the tire. Each of the peripheral zones is divided into the form of arrow feathers by traverse grooves having walls tilted through at least 20% of the depth of the traverse groove at an angle within 20-40.degree. to a center line of the traverse groove. The ratio of total areas of the central zone to those of one of the peripheral zones is 1:1.0 to 1:1.5, and the ratio of the total areas of inner and outer peripheral blocks in the peripheral zones divided by a continuous zigzag groove substantially parallel with the main grooves is 1:1.5 to 1:2.

Abstract: A pneumatic radial tire for heavy load vehicles comprises a carcass and a belt for reinforcement of the carcass, said belt including tension members composed of at least two rubberized metal cords crossing with each other at a cord angle of not more than 25.degree. with respect to equatorial plane of tire, in which said metal cords is coated with a rubber having a modulus of elasticity of 40-80 Kg/cm.sup.2, a distance between the cords in each tension member is widened to 0.2-0.75 d based on a diameter d of the cord, and an interlaminar cord distance D between the tension members is uniformly shortened to 0.2-0.4 d at a central region extending within 50-80% of a superposed width of the tension members.

Abstract: A radial tire having a highly durable bead structure, comprising a carcass ply having a high modulus of elasticity is disclosed. The bead is constructed to satisfy the following conditions, i.e.,h.sub.2 = (1/10 to 1/2)h.sub.0, and (1)d = (1/30 to 1/5)D (2)where h.sub.0 is a vertical height of the upper end of a turn up portion of the carcass ply measured from a base of the bead, h.sub.2 is a vertical distances from the upper end of the turn up portion of the carcass ply to the upper end of an inner reinforcing cord layer, after the tire has been mounted and inflated d is an interlayer gauge of a space formed between the turn up portion of the carcass ply and an outer reinforcing cord layer and measured on a line passing through the upper end of the turn up portion of the carcass ply and perpendicular to the carcass ply and D is a thickness of that portion of the bead which is measured on said line. A rubber having a modulus of elasticity of 20 to 100 Kg/cm.sup.2 at 100% elongation is inserted into said space.