摘要:
To provide a quick-setting admixture for spraying and a spraying method, which are effective to prevent solidification of a quick-setting admixture slurried in a quick-setting admixture-adding tool.A slurry quick-setting admixture comprising an alkaline earth metal carbonate, a water-soluble acidic substance, calcium aluminate, an alkali metal sulfate, and water; and a quick-setting cement concrete comprising such a slurry quick-setting admixture and cement concrete.The slurry quick-setting admixture may further contain calcium sulfate, calcium hydroxide and/or aluminum hydroxide, a retarder, etc. The spraying method comprises mixing water and a powder quick-setting admixture comprising an alkaline earth metal carbonate, a water-soluble acidic substance, calcium aluminate and an alkali metal sulfate, to form a slurry quick-setting admixture, mixing this slurry quick-setting admixture with cement concrete to form a quick-setting cement concrete, and spraying this quick-setting cement concrete.Further, a quick-setting admixture for spraying which comprises a liquid quick-setting admixture, and a powder admixture comprising a blowing agent such as an alkaline earth metal carbonate, and calcium aluminate, wherein the powder admixture further contains calcium sulfate or an alkali metal-containing substance, and wherein the liquid quick-setting admixture further contains an alkali metal element or a compound having a fluorine element. The quick-setting admixture for spraying wherein the liquid quick-setting admixture and the powder admixture are joined and mixed in a slurry form.
摘要:
A cement admixture and a cement composition having a carbonation suppressing effect and a heat-of-hydration suppressing effect are provided. A cement admixture containing one or more non-hydraulic compounds selected from the group consisting of γ-2CaO.SiO2, α-CaO.SiO2 and calcium magnesium silicate, a cement composition containing said admixture, and a carbonation suppressing method by use of said cement admixture or cement composition. According to the present invention, a remarkable carbonation suppressing effect can be obtained particularly when used in portland blast-furnace slag cement. This leads to an effective use of steelmaking slag and the like, and the load of clinker can be reduced, so that a cement composition of a low environmental load type can be attained. Further, this is suitable for cements in conformity with the EN standards, which are used in civil engineering and building industries.
摘要:
A position of an object is controlled based on a distance YS until the object is stopped, a target velocity VS of the object, acceleration time ta for accelerating the object, deceleration time td for decelerating the object, velocity variation &Dgr;Va within the acceleration time, and velocity variation &Dgr;Vd within the deceleration time, and a deceleration-start distance YSd. The distance YSd is a distance from where the object is made to start deceleration. The distance YSd is a sum of an integer part YSdq and a decimal part YSdr of the deceleration-start distance. Thus, management of decimal fractions is performed with respect to a pulse generation unit that outputs an output pulse corresponding to the velocity instruction.
摘要:
A semiconductor memory comprises a memory cell array including a plurality of digit lines, a plurality of word lines, a plurality of memory cells located at intersections between the digit lines and the word lines, and a column selection circuit for selecting one digit line from the digit lines in accordance with a selection signal. A sense amplifier includes a first P-MOS transistor for precharging a digit line selected by the column selection circuit, an inverting amplifier having an input connected to receive a signal on the selected digit line, and a second P-MOS transistor having a gate and a drain connected to an output and an input of the inverting amplifier, respectively. A gate-grounded third P-MOS transistor maintained in a conductive condition is connected at its source to a voltage supply voltage and at its drain connected to a source of the P-MOS second transistor. The third P-MOS transistor has an on-resistance larger than that of the second transistor and substantially the same current driving capability as that of the second transistor.
摘要:
There is provided a copper alloy which comprises 1.0 to 3.5 wt. % of Ni, 0.2 to 0.9 wt. % of Si, 0.02 to 1.0 wt. % of Mn, 0.1 to 5.0 wt. % of Zn, 0.1 to 2.0 wt. % of Sn, and 0.001 to 0.01 wt. % of Mg, and 0.001 to 0.01 wt. % of one or more members selected from Cr, Ti, and Zr, with the remainder being substantially Cu. The copper alloy is suitable for lead frames for semiconductors and is also suitable for terminals and connectors. The copper alloy is produced by a process which comprises starting cooling from a temperature above 600.degree. C. at a rate of 5.degree. C. per second or higher after hot rolling of an ingot of said copper alloy, performing annealing at a temperature of 400.degree. to 600.degree. C. for 5 minutes to 4 hours after cold working, performing refining finish rolling, and performing annealing at a temperature of 400.degree. to 600.degree. C. for a short time of 5 to 60 seconds.
摘要:
A method of manufacturing a glass base material is provided. The glass base material according to the present invention can prevent an initial glass material from being scratched by a gripping portion and from being unfastened and can manufacture in a stable state without deflecting the initial glass material during depositing glass particles when the initial glass material is gripped by metal chucks, and the glass particle are deposited on the periphery of the initial glass material. A cushioning material of which surface has irregularity is intervened between the initial glass material and the gripping portion of a gripping device when the initial glass material is rotated with gripped by the gripping device and the glass particles are deposited on the periphery of the staring glass material. The cushioning material is preferably an elastic material having the thickness twice as long as the depth of the irregularity on the surface of the initial glass material.
摘要:
A cement composition of an environmental impact reducing type, used in the field of civil engineering and construction, which provides initial strength-development equal to that of ordinary Portland cement and which can reduce the clinker calcination amount, is provided. A cement composition containing Portland cement having a 3CaO.SiO2 content of at least 60% and a slowly cooled blast furnace slag powder, wherein the content of the slowly cooled blast furnace slag powder is from 10 to 50 parts per 100 parts of the cement composition.
摘要:
In a vehicle having a pair of right and left front wheels and a pair of right and left rear wheels, when the front wheels are driven wheels, a differential limiting mechanism such as a multi-disc viscous clutch is arranged between axle members coupled to axles of the front wheels via universal joints, or when the rear wheels are driven wheels, the differential limiting mechanism is arranged between axles of the rear wheels. The differential limiting force of the differential limiting mechanism is controlled on the basis of various physical quantities (a steering angle .theta.h, a vehicle speed V, a brake hydraulic pressure P, a vertical acceleration G, and a road-surface .mu.) associated with the traveling state of the vehicle detected by sensors. Therefore, there can be provided a driven wheel differential limiting apparatus for a vehicle, which has high reliability and durability since the differential limiting force is controlled via, e.g., the viscous force of a fluid, and which can assure quick-turn traveling performance at a low vehicle speed, and can improve straight traveling stability in a high-speed traveling state since the degree of differential limiting is varied in correspondence with the traveling state of the vehicle.
摘要:
Shift control system and method are provided for use in a vehicle automatic transmission in which a desired speed range is achieved in accordance with the state of driving of a vehicle. The degree of meandering of a running road on which the vehicle is running is detected. The downhill grade of the running road is also detected. Based on the detection results, it is determined whether or not the running road is a meandering downhill road. When it is determined that the vehicle is running on the meandering downhill road, it is then determined whether or not a downshift is needed. When the downshift has been determined to be necessary, the speed range of the vehicle automatic transmission is shifted from a current speed range to a speed range lower than the current speed range.
摘要:
This invention relates to a shift control system and method for a vehicle automatic transmission, in which control of a downshift on a downhill road is performed by fuzzy inference. When a vehicle has been determined to be running on a downhill road by a driving state determining device, a speed range setting device sets as an optimal speed range a speed range lower than a current speed range. In the automatic transmission, the state of engagement of a desired engaging element is changed over to achieve the optimal speed range. When the vehicle has been determined to be running on the downhill road by the driving state determining device so that the speed range lower than the current speed range has been set as the optimal speed range and also when no change has been determined in engine load by an engine load detecting device, an engagement state control device reduces engaging force to be produced upon changing over the state of engagement of a desired engaging element for achieving the optimal speed range. This makes it possible to eliminate a sense of incogruity, which would otherwise occur upon shifting to a higher speed range, while assuring a good shifting response.