摘要:
A radar apparatus comprises a rotary polygon mirror with a plurality of mirror surfaces inclined at different angles. A semiconductor laser diode and a collimator lens are disposed above the polygon mirror. An infrared pulse beam emitted from the semiconductor laser diode is reflected by a reflection mirror disposed at an upper position in front of the polygon mirror to reflect the pulse beam obliquely downward toward the rotary polygon mirror so that the pulse beam is reflected as a transmission beam advancing toward a measuring area in a forward direction. A light receiving means receives the transmission beam returned from an object positioned within the measuring area.
摘要:
A radar apparatus for automotive vehicles is provided which is designed to emit laser beams to scan a forward zone for detecting moving object such as preceding vehicles and a downward zone for detecting lane marks printed on a road surface for defining a traffic lane. The downward zone is wider than the forward zone horizontally. Each zone has a minimum width required for assuring desired accuracy of radar detection of an object, thereby minimizing the number of emissions of the laser beams, resulting in an increase in lifetime of a laser diode and production of unwanted data on roadside objects having a low probability that the vehicle will collide them. The apparatus also includes a light focusing mechanism which focuses the laser beam on a given area in the downward zone to increase the power density of a return of the laser beam.
摘要:
A casing is provided for a reflection measurement device emitting a scanning beam and receiving an echo beam caused by reflection of the scanning beam at an object, and detecting a distance to the object in response to the received echo beam. The casing has a window for conducting a beam, and a protective member being transparent to the beam and covering the window from an inside. A predetermined range through which the beam passes is provided in the window. An interval between a lower edge of the beam pass range and a lower edge of the window is greater than an interval between opposing edges of the beam pass range and the window which differ from the lower edges thereof.
摘要:
An obstacle discrimination device has a first detection unit, a second detection unit which is more resistant to damage than the first detection unit, and an obstacle discrimination ECU. The obstacle discrimination ECU performs at least one of a discrimination for determining whether or not an obstacle colliding with a vehicle is a lightweight obstacle and a discrimination for determining whether or not the obstacle is a heavyweight obstacle based on detection signals of the first detection unit, and performs a discrimination for determining whether or not the obstacle is the heavyweight obstacle based on detection signals of the second detection unit. The obstacle discrimination ECU sends instructions corresponding to discrimination results to a pedestrian protection device and the like of the vehicle.
摘要:
A polyglycolic acid resin is used as a forming aid to efficiently produce various shapes, such as porous film, ultrafine fiber, ultrafine film and porous hollow fiber, of shaped products of substantially water-insoluble thermoplastic resins. More specifically, a shaped composite of the polyglycolic acid resin and the substantially water-insoluble thermoplastic resin is caused to contact an aqueous medium, thereby selectively removing the polyglycolic acid resin through solvolysis and extraction to leave a shaped product of the remaining thermoplastic resin. A glycolic acid aqueous produced by the solvolysis and extraction can be recycled into the polyglycolic acid resin as a forming aid via the formation of a concentrated glycolic acid oligomer and glycolide.
摘要:
A vinylidene fluoride polymer having good high-temperature coloring resistance is produced through suspension polymerization at 10-100° C. in a mixture solvent of 100 wt. parts of an aqueous medium and 10-50 wt. parts of a halogenated hydrocarbon solvent showing a good dissolving power to both a vinylidene fluoride monomer and a polymerization initiator and represented by a formula of: CX3CX2CHX2, wherein X is a fluorine or chlorine atom, and 7 X's include 4-6 fluorine atoms and 1-3 chlorine atoms. The vinylidene fluoride polymer is characterized by an elutable total organic carbon content in pure water at 95° C. of at most 1.1 &mgr;g/cm2.
摘要翻译:通过在100-100℃的混合溶剂中在10-100℃下悬浮聚合制备具有良好耐高温着色性的偏二氟乙烯聚合物。 水性介质的一部分和10-50wt。 部分卤代烃溶剂对偏二氟乙烯单体和聚合引发剂具有良好的溶解力,并由下式表示:其中X是氟或氯原子,7 X包括4-6个氟原子和1-3个 氯原子。 偏二氟乙烯聚合物的特征在于在95℃的纯水中可洗脱的总有机碳含量最多为1.1mug / cm 2。
摘要:
The present invention discloses a process for producing a granular polyarylene sulfide which has a high melt viscosity and a high degree of cross-linkage, becomes gel under melting and is easy to handle in the production and the fabrication thereof.The process disclosed herein comprises (1) a step (A) an initial-stage polymerization step for obtaining a polyarylene sulfide by reacting an alkali metal sulfide, a dihaloaromatic compound and a polyhaloaromatic compound, having three or more halogen substituents in a molecule, in the presence of water in an amount of 0.5 to 2.9 moles per mol of said alkali metal sulfide at a temperature in the range of 180.degree. to 235.degree. C. until the total conversion ratio of said dihalo- and polyhaloaromatic compounds reaches 50 to 98% and the melt viscosity of a polyarylene sulfide obtained at the end of the step becomes 5 to 5,000 poise, measured at 310.degree. C. and a shear rate of 1,200/second; (2) a step (B) a temperature raising step in which while adjusting an amount of water to be 2.5 to 7 moles per mol of fed alkali metal sulfide, a temperature raising condition from the temperature of step (A) to 240.degree. C. is controlled so that the melt viscosity of a polymer obtained at 240.degree. C. reaches 300 to 10,000 poise, measured at 310.degree. C. and a shear rate of 1,200/second and the temperature raising rate between 240.degree. C. and a temperature of the following step (C) is further controlled to be within the range of 10.degree. to 100.degree. C./hour; and (3) a step (C) a second-stage polymerization step for further continuing the reaction at a temperature of 245.degree. to 290.degree. C. until a melt viscosity of the final product reaches not lower than 1.times.10.sup.5 poise, measured at 330.degree. C. and a shear rate of 2/second.The present invention also discloses a granular cross-linked polyarylene sulfide produced by the process described above.
摘要:
A graft copolymer is formed by graft-polymerizing 10-95 wt. parts of a vinyl monomer onto 5-90 wt. parts of the rubber polymer which comprises 40-99 wt. % of butadiene and 1-60 wt. % of an aromatic polycyclic vinyl monomer represented by the following formula (I) or (II): ##STR1## wherein R denotes a hydrogen atom or a methyl group. The graft copolymer is characterized by the rubber polymer having a high refractive index as well as a low glass transition temperature due to the use of the aromatic polycyclic vinyl monomer. Accordingly, the graft copolymer per se may be used as a thermoplastic resin having good transparency and impact resistance at a low rubber polymer content and may also be added to a transparent thermoplastic resin inclusive of a vinyl chloride resin and a styrene-acrylonitrile copolymer resin to provide the thermoplastic resin with an improved impact resistance while retaining a good transparency.
摘要:
A hydrophilic vinylidene fluoride resin composition, comprising: porous vinylidene fluoride polymer particles and a hydrophilic polymer having a weight-average molecular weight of at least 2×105 contained in the pores of the porous vinylidene fluoride polymer particles. The composition is preferably obtained by subjecting a slurry containing porous vinylidene fluoride polymer particles after suspension polymerization to an appropriate degree of heat treatment for adjusting the amount of residual polymerization initiator, then impregnating the Polymer particles with a hydrophilic monomer and polymerizing the monomer. The thus-obtained vinylidene fluoride resin composition exhibits persistent hydrophilicity and good processability.
摘要:
The present colliding obstacle detection apparatus comprises a pedestrian bumper, which is supported below a front bumper of the vehicle by a body of the vehicle, at least one collision detector, which is located on the pedestrian bumper, and a control circuit, which determines whether the collision has actually occurred based on a detection signal outputted by the at least one collision detector. The front end of the pedestrian bumper vertically aligns with or extending ahead of that of the front bumper. The at least one collision detector detects one of a collision of the pedestrian bumper with an obstacle, and a presence of the obstacle in a close proximity to the pedestrian bumper. When the control circuit determines that the collision has actually occurred, the circuit activates a colliding obstacle protector for protecting the obstacle, especially a pedestrian.