18 results about "Viscoelastic fluid" patented technology

A method for measuring the material properties of a viscoelastic fluid using one or more vibrating transducers, the method comprising: vibrating one or more vibrating transducers within the viscoelastic fluid so as to generate a first wave propagating from a first surface of the one or more vibrating transducers and a second wave propagating from a second surface of the one or more vibrating transducers; during vibration of the one or more vibrating transducers, the first surface and the second surface being spaced apart from and oriented with respect to each other such that the first wave and the second wave combine with each other to produce a final constructive or destructive interference; and determining the material properties of the viscoelastic fluid based on the vibration of the one or more vibrating transducers within the viscoelastic fluid.

This invention relates to the field of oilfield chemistry, and particularly to a diverting agent based on thermally reversible dynamic covalent bonds, its preparation method, and its application. The diverting agent is a polymer cross-linked via dynamic covalent bonds, which are constructed by thermally controlled Diels-Alder and reverse Diels-Alder reactions. The polymer is copolymerized from hydrophilic monomers containing double bonds and a dynamic covalent cross-linking agent containing double bonds. The dynamic covalent cross-linking agent containing double bonds is a polymerizable compound containing furan or cyclopentadienyl groups. During the plugging stage, under high-temperature conditions in deep or ultra-deep oil and gas reservoirs, the material transforms from rigid particles into a viscoelastic fluid, forming a temporary plugging layer at the pore or fracture entrance of high-permeability layers. During the degradation stage, pumping in a depolymerizing fluid triggers a reverse Diels-Alder reaction, achieving complete degradation. This solves the problem of poor temperature resistance and low strength of diverting agents, which cannot meet the needs of balanced oil and gas field development in deep or ultra-deep oil and gas reservoirs.

The application discloses a graphene preparation method based on interlayer stress resonance. Macroscopic mechanical rotation energy is converted into high-frequency and directional stress energy which can precisely act on the van der Waals force between graphite layers through a series of carefully designed physical processes. Under specific rotation conditions, unstable vortex structures (such as Taylor vortex flow) are generated in the confined fluid. When the stress wave formed by the vortex in the viscoelastic fluid is coupled with the intrinsic vibration frequency between the graphite layers, resonance phenomenon is triggered. The resonance can amplify the strain energy between the graphite layers, so that the interlayer van der Waals force is efficiently and selectively overcome under the condition of energy input far lower than the in-plane fracture threshold of carbon-carbon bond, and the graphene is exfoliated to obtain large and few-layer graphene.

The application relates to the field of exploration geophysical seismic fluid identification, in particular to a frequency-variable solid-liquid decoupling viscoelastic fluid factor prestack seismic inversion method. The method comprises the following steps: step 1, carrying out equal-interval frequency division processing on seismic data; step 2, carrying out frequency division elastic impedance inversion by using the frequency division seismic data in step 1; step 3, frequency-variable solid-liquid decoupling fluid factor inversion equation construction; step 4, carrying out frequency-variable solid-liquid decoupling fluid factor inversion equation coefficient inversion for each prestack angle stack and sampling point; and step 5, frequency-variable solid-liquid decoupling fluid factor inversion. The method improves the fluid factor inversion precision on the basis of conventional solid-liquid decoupling fluid factor inversion by establishing a reference frequency and frequency division frequency calculation process.

The invention belongs to the technical field of fluid mixing, and discloses a multi-stage leaf-shaped static mixer for mixing viscoelastic fluid and Newtonian fluid, and multi-stage mixing units which are sequentially connected end to end in the longitudinal direction are arranged between a fluid input channel and a fluid output channel; the fluid input channel is used for connecting the Newtonian fluid inlet and the viscoelastic fluid inlet, and the fluid output channel is used for leading out mixed liquid; the mixing unit is a flat shell composed of an upper surface, a lower surface, a first outer contour surface, a first inner contour surface, a second outer contour surface and a second inner contour surface, and an upstream confluence area, a shunting area and a downstream confluence area are sequentially formed between the first outer contour surface and the first inner contour surface and between the second outer contour surface and the second inner contour surface. According to the invention, the viscoelastic fluid can be rapidly mixed under the condition of low shear disturbance, so that the fluid forms secondary vortex and spiral flow along the main flow direction in the mixing area, and the mixing rate of the viscoelastic fluid and the Newtonian fluid is obviously improved.

The application is a method and system for constructing a wide-temperature-range constitutive model of a viscoelastic fluid in a space environment, which relates to the cross-technical field of computational materials science, aerospace tribology and fluid dynamics, and comprises the following steps: performing sinusoidal shearing on a balanced full-atom model at multiple key temperature points, simulating the dynamic response under sinusoidal shearing to obtain original strain time series data and original stress time series data, performing filtering and smoothing processing and feature extraction to obtain waveform features, and calculating shear rate time series data; inputting the filtered and smoothed original strain time series data and the shear rate time series data into a constitutive mathematical model to obtain predicted stress, minimizing the error between the predicted stress and the filtered and smoothed original stress time series data for multi-stage optimization, and obtaining a wide-temperature-range constitutive model of a viscoelastic fluid. The application solves the technical problem that the constitutive model is difficult to obtain rheological parameters of a space lubricating fluid under wide-temperature-range and large-amplitude shearing, resulting in low prediction accuracy.

The invention provides a medical waterproof adhesive as well as a preparation method and application thereof. The preparation method of the medical waterproof adhesive comprises the following steps: firstly preparing solid gel, and then adjusting the rheological property of the solid gel to obtain the viscoelastic fluid waterproof adhesive. The preparation method of the adhesive provided by the invention is simple and convenient to operate, controllable in process, high in repeatability and low in cost. The prepared waterproof adhesive is stable in performance, shows good injectability and spreadability at normal temperature, and is convenient for surgical operation; in a wet ocular surface environment, a pre-formed network can effectively resist immediate flushing and dilution of body fluids such as tears, aqueous humor and blood, so that stable residence and accurate positioning on the surface of a target tissue are ensured; under the irradiation of a light source with specific wavelength, the gel is subjected to polymerization reaction, a compact and firm secondary cross-linked network is quickly formed under a wet condition, and stable and reliable in-situ solidification and tissue adhesion are realized.

A viscoelastic fluid composition includes a viscoelastic surfactant composition ranging from about 0.1 wt. % to about 10 wt. % based on a total wt. % of the viscoelastic fluid composition. The viscoelastic fluid composition further includes crystalline sodium sulfate cellulose (NaSC) nanoparticles ranging from about 0.1 wt. % to about 10 wt. % based on the total wt. % of the viscoelastic fluid composition.

The invention discloses a temperature-sensitive magnetic bead, a preparation method thereof and related application of the temperature-sensitive magnetic bead in early cancer screening, and the temperature-sensitive magnetic bead is prepared by taking an unsaturated superparamagnetic bead with vinyl on the surface as a matrix through an in-situ free radical polymerization mode. N-isopropylacrylamide, acrylamide and oligomeric (ethylene glycol) methyl ether methacrylate are initiated to be copolymerized on the surfaces of the magnetic beads to form a temperature-sensitive polymer brush layer with an adjustable low critical solution temperature (LCST). The temperature-sensitive magnetic beads are in a hydrophobic collapsing state under the condition of 37-39 DEG C, are maintained in a viscoelastic fluid state beneficial to dynamic replacement of low-abundance proteins, and can efficiently adsorb the low-abundance proteins in plasma; the temperature-sensitive magnetic beads are rapidly converted into a hydrophilic stretching state at the temperature lower than 36 DEG C, and the multi-point interaction between the proteins and the temperature-sensitive magnetic beads is synchronously weakened by utilizing micromechanical ejection force generated by phase change, so that the proteins are completely eluted from the surfaces of the magnetic beads.

The invention provides a method for calculating a stabilized viscoelastic fluid-solid coupling problem based on an overlapped grid, and relates to the technical field of fluid-solid coupling calculation, the method comprises the following steps: processing a flow field region and solid particles to obtain an interpolation boundary, a contribution unit and an interpolation unit, and carrying out flow field calculation on a background grid to obtain background grid flow field information; transmitting the background grid flow field information to the sub-grids to obtain the flow field information of the sub-grids; calculating by using the flow field information of the sub-grids through a finite element method to obtain updated flow field information of the sub-grids; transmitting the updated sub-grid flow field information to a background grid by using bilinear Lagrange interpolation to obtain updated background grid flow field information; based on the updated background grid flow field information, parameter iteration updating is carried out through calculation, and simulation data of the motion trail and the rotation state of the solid particles in the flow field area are obtained. According to the method, the problems of low precision and low efficiency of fluid-structure interaction calculation are solved.

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

Described here are systems and methods for accessing Schlemm's canal and for delivering an ocular device or fluid composition therein. The ocular devices may maintain the patency of Schlemm's canal without substantially interfering with transmural fluid flow across the canal. The fluid composition may be a viscoelastic fluid that is delivered into the canal to facilitate drainage of aqueous humor by disrupting the canal and surrounding trabeculocanalicular tissues. Tools for disrupting these tissues and minimally invasive methods for treating medical conditions associated with elevated intraocular pressure, including glaucoma, are also described.

Aspects include using a vibration transducer having a plurality of oscillators including a first oscillator (220) and a second oscillator (210), where the first oscillator and the second oscillator are coupled such that in a viscoelastic fluid (240), excitation (vibration) of the first oscillator excites the second oscillator (causing the second oscillator to vibrate). The frequency response of the double-oscillator combination is influenced by the fluid characteristics; thus measuring one or more of: i) resonant frequency, ii) vibration amplitude, iii) loss factor (or Q factor) of a vibration combination of the first oscillator and the second oscillator in the viscoelastic fluid may be used to determine one or more of: i) density, ii) viscosity (such as dynamic viscosity), iii) elasticity (such as storage modulus) of the viscoelastic fluid.

The application discloses a microfluidic chip design method and device based on a viscoelastic fluid binding effect, and the method comprises the following steps: selecting a microfluidic channel capable of effectively utilizing viscoelastic fluid instability to bind droplets; designing the size of the selected microfluidic channel; configuring a displacement fluid according to the size of the known microfluidic channel; constructing a viscoelastic fluid dynamics model according to the known microfluidic channel; determining critical conditions of droplet oscillation binding based on the viscoelastic fluid dynamics model and experimental results; and establishing a microfluidic design criterion based on viscoelastic fluid instability to bind droplets according to the critical conditions of droplet oscillation binding. The application can precisely and controllably realize oscillation binding of droplets based on the instability characteristics and unique microfluidic channel design of the viscoelastic fluid, so that the microfluidic chip with the oscillation binding function has a wider application scenario.

The utility model belongs to the technical field of metal sound barriers, and particularly relates to a novel inserting plate type metal sound barrier unit plate. The metal sound barrier unit plate comprises a cavity formed by a face plate, a back plate and edge beams, a sound absorber is installed in the cavity, the sound absorber is composed of a honeycomb structure block and a viscoelastic fluid filling layer arranged in the honeycomb structure block or the sound absorber is composed of a rock wool core layer and a sound transmission plate clamping the rock wool core layer, irregular cavity gaps are distributed in the sound transmission plate, and the irregular cavity gaps are distributed in the cavity. In the cavity, a front reverberation chamber is formed between the sound absorber and the panel, and a rear reverberation chamber is formed between the sound absorber and the back plate; the metal sound barrier unit plate is provided with a composite sound absorption system and has the advantages of being long-acting and stable in sound absorption and noise reduction, firm in structure, economical and durable.

Microsurgical instruments having combined illumination, laser ablation, and viscoelastic injection functions. A surgical instrument includes a probe having a main lumen and a port at a distal end thereof. The probe may further include one or more optical fibers within the main lumen, the optical fibers configured to project laser light and illumination light. Laser light may be emitted from the distal end of the probe for disrupting an ocular tissue, while illumination light may be simultaneously emitted, axially or laterally, to provide enhanced visualization of the intraocular space during tissue disruptance. Upon disrupting the tissue, a viscoelastic fluid may be injected from the port to maintain an integrity of the intraocular space.

The invention discloses a viscoelastic medium gas-bearing property prediction method, electronic equipment, a storage medium and a device. The method comprises the following steps: acquiring a plurality of pre-stack sub-angle superposition gathers based on a pre-stack full-angle gather; determining dominant frequency band data of each pre-stack sub-angle superposition gather based on typical well seismic channel time frequency analysis, and obtaining a plurality of pre-stack sub-angle frequency division superposition gathers; longitudinal wave impedance inversion is carried out based on each pre-stack sub-angle frequency division superposition gather, and longitudinal wave impedance corresponding to each pre-stack sub-angle frequency division superposition gather is obtained; calculating a frequency-dependent operator inversion coefficient under the viscoelastic medium based on the longitudinal wave impedance corresponding to each pre-stack angle-division frequency-division stack gather; calculating a frequency-dependent viscoelastic fluid factor based on the inversion coefficient of the frequency-dependent operator under the viscoelastic medium; and carrying out viscoelastic medium gas-bearing prediction based on the frequency change viscoelastic fluid factor. According to the method, the gas-bearing property prediction of the viscoelastic medium complex reservoir can be realized, and the inversion precision and the resolution are improved.

The application belongs to the technical field of pesticide dosage forms, and provides a drug-loaded fluid material prepared based on a solubilization technology, a preparation method and application. The fluid material is prepared from raw material A, raw material B, a surfactant and an organic solvent; the raw material A is any one of gamma-polyglutamic acid (PGA), corn alcohol-soluble protein and wheat alcohol-soluble protein; the raw material B is at least one kind of monomer containing an isocyanate group with a functionality of greater than or equal to 2. The state of the fluid material is regulated by changing the ratio of the two kinds of raw materials to the organic solvent, and the drug loading rate is significantly improved in the fluid state, especially reaching a maximum value in the viscoelastic fluid state; the fluid material preparation method is simple, the raw materials are widely sourced and low in cost, and has wide application in the field of pesticides.