35 results about "Penetration index" patented technology

The invention discloses a control system and method of a dedicated lane for an autonomous vehicle. The system comprises a vehicle-mounted system, a roadside system, a cloud lane management center, anda road information prompting system. The vehicle-mounted system includes a vehicle-mounted information processing center, an information acquisition device, a vehicle-mounted communication module, and a human-computer interaction terminal arranged on a manually driving vehicle, and an automatic driving terminal arranged on the autonomous vehicle. The roadside system includes a roadside information processing center, a video monitoring module, a roadside unit and a second 5G communication module. The road information prompt system includes an information issuing center, a variable informationprompt board, a broadcast and a third 5G communication module. The cloud lane management center includes a data processing center, a traffic information database and a fourth 5G communication module.Different traffic congestion impact factors are assigned for a manually driving vehicle and an autonomous vehicle; and whether to start an autonomous vehicle dedicated lane is decided based on a traffic congestion index and an autonomous vehicle penetration index, so that the traffic efficiency is improved.

The invention provides a method for evaluating performances of normal-temperature modified road asphalt, for solving the following problems: a method for evaluating performances of normal-temperature modified asphalt does not exist in existing national standard and industrial standard; the quality of the normal-temperature modified asphalt is difficult to control; and the application area of the normal-temperature modified asphalt is difficult to determine. The method disclosed by the invention comprises the following steps: (1), respectively measuring the rotary viscosity at 60 DEG C, the penetration, the penetration index, the adhesion with coarse aggregates and the flashing point of the normal-temperature modified road asphalt; and (2), according to test results of the performances, determining application temperature areas of the normal-temperature modified road asphalt including a cold area, a warm area and a hot area. According to the invention, aiming at material composition characteristics and construction forming conditions of the normal-temperature modified road asphalt, the normal-temperature modified road asphalt is comprehensively evaluated in five aspects including workable performance, temperature sensibility, water-resistant peeling and use safety; the application temperature areas of the normal-temperature modified road asphalt are definite; and effective quality assurance is provided for engineering application of the normal-temperature modified road asphalt.

The present invention provides a railway surface joint-filling material with high-performance and its production process. It is made up by using modified asphalt, aromatic hydrocarbon oil, styrene-butadiene rubber powder and plasticizer according weight portion ratio, and its production process includes the following steps: heating modified asphalt to 130-150 deg.C, adding 4-10 weght portions of aromatic hydrocarbon oil, stirring them by using stirrer, at the same time of stirring adding 15-25 weight portios of rubber powder and 3-8 weight portions of plasticizer, stirring them at 130 deg.C. The low-temp. ductility of said invented material (5 deg.C) is greater than 60 cm., its penetration index (PI) is 4.0-7.0, equivalent softening point can be up to 60-85 deg.C equivalent brittle point can be up to -60- -100 deg.C, elastic recovery can be up to 98-100% and normal service life can be up to above 5 years.

The invention provides a modified asphalt composition and a preparation method thereof. The modified asphalt composition comprises, by weight, 87.5% to 98.9% of base asphalt, 1% to 10% of a modifier and 0.1% to 2.5% of a gelatinizing agent (a structure improver). The preparation method comprises the following steps: uniformly dispersing the modifier into the base asphalt at a temperature of 150 to 260 DEG C by using equipment like an ordinary agitator, a high speed shearing machine or a colloid mill to prepare the modified asphalt composition; and adding the gelatinizing agent to allow a sol-gel type colloid structure of asphalt to be converted into a gel type colloid structure and to allow a stable colloid structure of asphalt to be formed. According to the invention, the preparation method for the modified asphalt composition is simple; and the prepared modified asphalt composition has a high softening point, high viscosity, a high penetration index, excellent high and low temperature performance, excellent ageing resistance, small temperature sensitivity and the like, can reduce occurrence of damages like tracks and upheaval on a pavement and prolong a maintenance period of the pavement and is applicable to construction of high-grade highways.

The invention discloses a heterogeneous correction method for compensating low-grey scale X-ray image signals, comprising steps of, after training and obtaining reference data-training reference value compensating low-grey scale image signals based on analyzing draw bead generating reasons, firstly, carrying out normal heterogeneous correction to a collected article passing a channel type line scanning X-ray safety inspection device so as to primary image data; secondly, subtracting a training reference value of a scintillator at a corresponding position from a grey scale value of each scintillator in the primary image data to obtain a corrected image grey scale value; lastly, strengthening signals of an image of which the grey scale value is corrected by the heterogeneous stretching formula to make the corrected and strengthened image displayed more clearly. The inventive heterogeneous correction method for compensating low-grey scale X-ray image signals is characterized in that draw bead problem of low-grey scale images is solved, and penetration indexes and image quality of a X-ray safety inspection device are guaranteed.

The invention discloses a method of evaluating relative compaction of calcium soil on the basis of a dynamic penetration index calibration system. The method include: A) drying a calcium soil sample and determining [rho]<d, max>, [rho]<d, min>, d<50> and C; B) calculating the [rho]di of each type of the calcium soil sample under every Dri; C) testing the penetrating hammer striking time of eachtype of the calcium soil sample and the accumulated penetrating depth of a probe; D) respectively drawing hammer striking time-accumulated penetrating depth scatter diagrams, and fitting the slope p<index, i> of each straight line; E) acquiring [p<index, i>SQRT(d<50>C), Dri], and drawing a scatter diagram; F) performing fitting to obtain an expression formula of p<index, i>SQRT(d<50>C) andDri; G) acquiring an expression formula of relationship between 300[SQRT(d<50>C)]/N10 and the Dri; H) expressing the physical quantities by means of absolute coefficient fundamental dimensions; I)according to the dimensions of the physical quantities, forming a dimension matrix and calculating [pi]1 and [pi]2; J) determining the relationship between dynamic penetration test physical quantitiesand light dynamic penetration test physical quantities; K) deriving a penetration index of the dynamic penetration test; and L) substituting the index into the expression formula, thus obtaining a new expression formula.