12 results about "Particle density" patented technology

The application discloses a kind of based on transparent soil and pile-soil interface micro evolution measurement method of multi-source sensing, it is related to geotechnical engineering test field.The present application includes the following steps: constructing transparent soil model, pile body pre-embedded sensor arrangement, multi-source sensor calibration and parameter optimization, load application and multi-source data acquisition, improved DIC algorithm's pile-soil interface micro displacement calculation, pile-soil interface pore and particle density calculation, multi-source sensing data's heterogeneous fusion, pile-soil interface micro evolution characteristic quantitative inversion and visualization, test end and data verification.The present application simulates real soil environment by constructing transparent soil model, in combination with image recognition, digital image correlation, fiber-optic sensing and resistance sensor and other multi-source sensing technology, the micro deformation, stress distribution and failure evolution process of pile-soil interface in loading process are monitored and analyzed in real time with high precision, realize the high-precision, full-process, visual measurement of pile-soil interface micro evolution, improve measurement precision.

The application provides a method for determining the type of defects in a single crystal silicon wafer, comprising the following steps: measuring the particles in the As-Grown state silicon wafer by LST to obtain a first measurement result, and determining a V-rich region according to the first measurement result and a first preset density value; and performing heat treatment on the silicon wafer, and again measuring the particles in the silicon wafer by LST to obtain a second measurement result, and determining a Pv region, an I-rich region and a Pi region according to the second measurement result, a second preset density value and a third preset density value, so as to accurately and effectively distinguish the four region types of the V-rich region, the Pv region, the Pi region and the I-rich region in the single crystal silicon wafer by using the particle density, the test result is obviously distinguished, the test stability is high and the repeatability is high, and the requirement of the defect partition type on the silicon wafer is reduced.

The utility model provides a kind of forming device of adjustable color master batch particle density, belong to plastic processing technical field, to solve the forming device of existing adjustable color master batch particle density, easy to wear when rotating, gear is easy to break and difficult to detect in time and the problem of vibration deviation and exacerbate wear without timely lubrication. Including double-screw extruder, driving mechanism, machine cylinder, feed hopper, drive screw, oil bottle, piston cylinder, monitoring frame, maintenance assembly and monitoring assembly, the drive screw is provided with two groups, two groups the drive screw is installed in machine cylinder interior;The oil bottle is fixedly installed on the upper portion of double-screw extruder;The piston cylinder is fixedly installed in double-screw extruder interior;The monitoring frame is provided with two groups, two groups the monitoring frame is fixedly installed in machine cylinder one end;The maintenance assembly is arranged in double-screw extruder interior;The monitoring assembly is arranged in machine cylinder one end.The utility model has the advantages of convenient maintenance, convenient to use, deviation monitoring etc..

This invention relates to the field of engineering surveying technology and provides a method for determining the porosity of coarse-grained soil. The method includes: excavating a first trench in the field and removing all the coarse-grained soil from the first trench; determining the total mass m1 of the coarse-grained soil in the first trench; measuring the volume of the first trench in the field as the total pore-containing volume V1 of the coarse-grained soil in the first trench; measuring the total mass m2 of all the coarse-grained soil drained from the first trench in the field using the drainage method; excavating a second trench at a location adjacent to the first trench and taking a sample from the second trench for laboratory measurement to determine the moisture content w of the coarse-grained soil; determining the particle volume V2 of the coarse-grained soil in the first trench based on m1, m2, and w; and determining the porosity of the coarse-grained soil based on V1 and V2. This method solves the problem of particle density representativeness error caused by partial sampling in traditional porosity measurement methods.

This invention discloses a method for optimizing process parameters in multi-step grinding of hard and brittle materials with varying depth of cut, comprising the following steps: establishing an existing damage evolution model; establishing a semi-empirical grinding damage depth prediction model; designing grinding experiments and determining the total grinding amount as a0; determining the number of grinding passes N on the surface of the hard and brittle material; and establishing the grinding depth a. p Select an optimization model; determine different grinding depths a i The depth of damage c below i Input the constraints of the optimization model; define the objective function; obtain the grinding depth 'a' at which the damage is minimized based on the optimization model. i This invention establishes a damage evolution model through simulation, revealing the influence of various surface damages on crack propagation and proving that traditional studies do not require the removal of existing damage by several times. This invention proposes a semi-empirical model for predicting grinding damage that does not rely on difficult-to-measure parameters such as abrasive particle density and undeformed chip thickness, and a relatively accurate damage prediction model can be obtained with a small amount of experimental data.

This invention belongs to the field of material performance testing technology, specifically relating to a method for determining the particle density of carbon anode raw materials. The method includes: injecting water into a first container until the liquid levels in the first and second containers are equal, and reading the scale of the first and second containers as V1; adding carbon anode raw material particles with a mass of m, including petroleum coke or calcined coke, into the first container; injecting a mixed solution into the first container until the carbon anode raw material particles are completely submerged, the mixed solution including pure water and a low-foaming nonionic surfactant; pre-treating the first and second containers in an ultrasonic instrument; and placing the pre-treated first and second containers into a vacuum chamber, evacuating the chamber until it reaches negative pressure, and maintaining the pressure in the vacuum chamber. This method for determining the particle density of carbon anode raw materials can accurately measure the particle density of carbon anode raw materials.

The present invention provides novel hollow silica particles with a densified shell and a method for producing the hollow silica particles. The hollow silica particles of the present invention have a shell layer containing silica, have a space portion inside the shell layer, and have a particle density of 2.00 g / cm 3 or less, as determined by density measurement based on a dry pycnometer using helium gas. 3 or less, as determined by density measurement based on a dry pycnometer using oxygen gas.

This utility model relates to a multi-chamber continuous reaction device, comprising a primary reaction vessel, an intermediate control vessel, and a secondary reaction vessel connected in sequence. The primary reaction vessel includes a first vessel body, a first inlet, and a first outlet. The intermediate control vessel includes a second vessel body, a second inlet, and a second outlet, and an inlet / outlet is provided at the top of the second vessel body. The upper end of the inlet / outlet is connected to a pressure regulating pipeline provided outside the second vessel body, and the lower end of the inlet / outlet extends into the interior of the second vessel body. The secondary reaction vessel includes a third vessel body, a third inlet, and a third outlet. The multi-chamber continuous reaction device provided by this utility model can realize continuous multiple reactions and can perform positive and negative pressure treatment on the reaction materials, thereby controlling the growth morphology and size of the materials and improving the particle density and uniformity of the materials.

The application relates to the field of soil materials, and aims to provide a high-density high-strength improved soil based on barite powder and a preparation method thereof.A high-density high-strength improved soil based on barite powder comprises undisturbed soil material, barite powder, cement and additional water, the weight ratio of the undisturbed soil material, the barite powder and the cement is 1:(0.2-0.8):(0.1-0.2), the weight ratio of the cement and the additional water is 1:(0.4-0.6), wherein the particle density of the barite powder is 3.0 g / cm 3 -4.0 g / cm 3 , and the particle size of the barite powder is 0.075 mm-0.15 mm.The undisturbed soil body is improved by the waste barite powder, the mechanical properties of the undisturbed soil body are effectively improved, and good economic benefits are achieved.

An optical detection apparatus is arranged to detect particles in a fluid flowing through a tubing portion of transparent or translucent material. The apparatus comprises a holder for the tubing portion; a light emitting device configured to irradiate a target volume inside the tubing portion when arranged in the holder; and at least one light receiving device configured to receive light from the target volume when irradiated by the light emitting device and generate one or more time-dependent output signals indicative of the received light. A computation device is configured to determine a parameter indicative of temporal variability in the one or more time-dependent output signals and estimate the density based on the parameter, which has been found to be robust to structural differences between tubings and allows the apparatus to be deployed without calibration.

The present application relates to the technical field of powder conveying, and particularly relates to a powder conveying device convenient to clean, which comprises an elbow pipe provided with an expanding diameter structure, a separation assembly and an adjusting assembly. The middle section of the elbow pipe is arranged as the expanding diameter structure with a cross-sectional area larger than that of the two ends of the elbow pipe, so that when the powder enters the expanding diameter structure from the narrow diameter of the feeding section, the flow rate of the powder is reduced, and the impact frequency and impact force of the powder particles on the inner wall of the elbow pipe are reduced. The passage of the elbow pipe is separated into multiple independent units by the separation assembly, so that the particle density of the powder in each passage unit is reduced, and the collision frequency between the particles is reduced. The adjusting assembly further reduces the flow rate of the powder at the feeding section position, and accelerates the decelerated powder at the discharging section, so that the overall powder conveying efficiency is prevented from being reduced.

This invention discloses a method and related equipment for calculating pressure through local reconstruction. The method includes: acquiring the particle density of each particle in the target fluid; quantizing the particle density to obtain the original pressure of the particles; quantizing the pressure information of the neighboring particles of each particle to obtain the local reference pressure of the corresponding particle; acquiring the numerical characteristic parameters of each particle to construct local numerical state parameters; determining the pressure reconstruction coefficient of each particle based on the local numerical state parameters combined with a scaling factor mapping; and performing local pressure reconstruction on the original pressure of the particles based on the local reference pressure and the pressure reconstruction coefficient to obtain the reconstructed pressure of the particles. This invention does not rely on specific types of state equations or kernel functions, is easily integrated into existing WCSPH code frameworks, and is applicable to various simulation scenarios ranging from free surface flow to complex industrial flow. It can be widely used in the fields of computer simulation and data processing technology.