30 results about "Matrix volume" patented technology

The invention relates to the field of vacuum cleaning and in particular the collection of air-entrained debris, for example in a filter bag. The invention is a filter for use in vacuum cleaning apparatus, which comprises fine planar filtration means and coarse planar filtration means both being adapted to be placed in a suction- induced air stream with the coarse filtration means disposed upstream of the fine filtration means, wherein the fine filtration means serves to provide a fine filter for retaining dust particles and wherein the coarse filtration means comprises a relatively coarse filter material having a thickness of at least 4mm which provides a matrix volume in which dust may be collected. The fine planar filtration means may be a filter web arranged in the form of a collection bag. The volume occupied by the coarse filtration means comprises at least 2 %, preferably at least 5 %, most preferably at least 10 % of the maximum internal volume defined by the collection bag. The filter provides significantly enhanced fine dust collection capability, particularly for the grinding of brick or plasterwork where large amounts of fine ceramic dust are continuously generated and which tends to foul and degrade conventional filters.

A method of manufacturing an impact absorbing device has following steps: a) providing a matrix volume (101); b) providing a tape-like device (107) with elongated metal elements; c) press-molding the matrix volume (101); d) attaching said tape-like device (107) to the press-molded matrix volume (101). This two-step approach allows more freedom in the design of the impact absorbing device and complex structures can be obtained.

The invention provides a method for improving the survival rate of young seedlings of sugarcane seedlings. The method comprises the steps that seeds are sowed in nursery boxes in a greenhouse, when the young seedlings of the sugarcane seedlings germinate and grow to 8 mm-12 mm in height, film and gauze are lifted up every morning, if the water content of the matrix volume is lower than 27%, watering is conducted, and the water content of the matrix volume is controlled to range from 25% to 30%; a shading net on the greenhouse is opened, the air humidity in the nursery boxes is controlled to be not more than 80% by utilizing sunlight illumination; the matrix humidity is observed every afternoon, and when the water content of the matrix volume is lower than 27%, the gauze and the shading net on the upper layer of the greenhouse are put on the nursery boxes and the greenhouse respectively; the temperature of the matrix is kept to range from 22 DEG C to 36 DEG C at night till rhizome bases of the young seedlings grow to be green from a transparent color. According to the method for improving the survival rate of the young seedlings of the sugarcane seedlings, when the young seedlings of the sugarcane seedlings grow to the phase prone to infringing of germs, by means of covering and opening of the gauze, the film and the shading net, water spray and illumination are combined, the temperature of the nursery boxes and the seedling matrix are strictly controlled, the occurrences of seedling burnt, dry seedling and diseases are prevented, and the survival rate of the young seedlings is improved.

The invention provides a method for predicting pore pressure of a carbonate rock stratum. The method comprises the following steps of firstly, carrying out a rock physical simulation experiment on a rock sample; then utilizing a Voigt-Reuss-Hill average modulus model for calculating the volume modulus of a rock matrix; calculating the volume modulus of a pore fluid by utilizing a Wood model and aPatch model; and calculating the volume modulus of a rock framework according to a rock physical simulation experiment fitting relational expression, and further calculating the pore pressure of the carbonate rock stratum. The beneficial effects of the invention are that: the technical scheme provided by the invention is based on a fluid-containing rock porous elastic mechanical theory and a generalized fenugreek law; starting from analysis of the carbonate rock stratum stress-strain pore pressure constitutive relation, a porous elastic mechanical pore pressure prediction theoretical model forrepresenting the quantitative relation between the pore pressure and the rock elastic parameter is established, so that the problem that the pore pressure is difficult to predict due to the fact thatthe carbonate rock is compact in lithology and extremely uneven is solved, and the method has industrial application value.

The invention provides a method for predicting the overpressure of a carbonate rock stratum. The method includes the steps that basic physical parameters are obtained by selecting a comprehensive interpretation model of oil, gas and water well logging according to the carbonate stratum; then a Voigt-Reuss-Hill average modulus model is used for calculating the rock matrix volume modulus, a Wood model or a Patchy model is used for calculating the pore fluid volume modulus, and a BISQ model is used for calculating the rock skeleton volume modulus; and finally, the overpressure is predicted by a porous elastic mechanics quantitative model. The new method for predicting the overpressure of the carbonate rock stratum has the beneficial effects that to a certain extent, the difficulty of overpressure prediction caused by dense and extremely heterogeneous lithology of carbonate rock is solved, and the industrial application value is achieved.

The invention discloses a method and a device for determining a mass bulk modulus of porous materials such as concrete. The method includes manufacturing a cubic porous material test piece, pasting strain gauges on six sides of the cubic porous material test piece, connecting the strain gauges to a data acquisition unit through data transmission lines, putting the test piece in a constant-pressure tank full of water, extracting water from a water tank through a water pressure controller to add water pressure on the constant-pressure tank until the water pressure is stabilized as T, recording strain values of the cubic porous material test piece in three directions regularly according to strain data acquired by the strain gauges until the strain values are kept unchanged, adding the strain values in three directions to obtain a strain value sum and a final strain value sum when the strain values are kept unchanged, and computing the mass bulk modulus of the porous material test piece according to the final strain value sum and the water pressure T. The method is capable of determining a numerical value of the mass bulk modulus of the porous materials, is accurate and real in measurement results, and can provide scientific data bases for effective stress studies of hydraulic structure engineering.

A method for obtaining the bulk modulus of rock matrix is ​​provided, including: (A) determining the equivalent rock matrix of the target logging depth point by using the logging data of the target logging depth point and a predetermined number of logging depth points adjacent to it up and down Bulk modulus; (B) determine the change interval and change increment of the dry rock Poisson's ratio at the target logging depth point; (C) determine the change interval and change increment of the rock matrix bulk modulus at the target logging depth point; (D) The optimal adaptive rock matrix bulk modulus at the target logging depth point is obtained by using the adaptive matrix mineral modulus inversion method under the double convergence condition; (E) the equivalent rock matrix bulk modulus at the target logging depth point The matrix bulk modulus and the optimal adaptive rock matrix bulk modulus are averaged to obtain the rock matrix bulk modulus at the target logging depth point. According to the method, the bulk modulus of rock matrix with high accuracy and stability can be obtained, which lays a favorable foundation for subsequent prediction of oil and gas reservoirs.

A method for producing a part made of ceramic matrix and ceramic fibers composite material. It comprises: the formation of a fibrous preform by intertwining threads constituted of ceramic material fibers on a contact surface of a support element reproducing the internal and / or external shape of the part to be produced; the partial densification of the fibrous preform at a temperature below the melting temperature of the material of the support element and below the melting temperature of the material of the fibers of the preform, said partial densification resulting in a consolidated fibrous preform comprising a matrix volume fraction above 5% and at the most equal to 40% of the matrix volume of the part to be produced; the removal of the support element from the consolidated fibrous preform by chemical attack of the contact surface of the material of the support element; the densification of the consolidated preform, carried out at a temperature below the melting temperature of the fibers of said preform.

The invention discloses a method for recognizing a slight crack of a reservoir, comprising steps of establishing a relation formula of a dry rock skeleton elastic modulus ratio changing along the change of the porosity and a double-pore DEM analytical model according to a rock matrix volume modulus, a shear modulus and double-pore structure parameters, configuring pore volume percentage of a plurality of groups of soft-hard pores, obtaining volume modulus and shearing modulus of the plurality of dry rock skeletons according to the analytical model, applying a Gassmann equation to obtain volume modulus and pore volume of a plurality of saturated rocks according to the volume modulus and the shearing modulus of the plurality of dry rock skeletons, calculating the error between the volume modulus and the shearing modulus of the saturated rock which are obtained through every application Gassmann equation and the volume modulus and the shearing modulus of the saturated rock which are obtained through practical well data, obtaining an optimal soft pore volume percentage when the error is minimal, and recognizing the slight crack of the reservoir according to the optimal soft pore volume percentage. The method can improve the accuracy of recognizing the slight crack of the reservoir.