13 results about "Viscous modulus" patented technology

The invention relates to the technical field of medical material performance testing, in particular to a performance testing system for injectable hydrogel, which is characterized in that an external testing environment characteristic parameter, a rheological characteristic parameter of a testing sample and a core temperature are acquired through a data acquisition module; calculating the viscous modulus and the elastic modulus of the test sample based on the rheological characteristic parameters through a data analysis module so as to judge whether the sample conforms to gelation dynamic characteristics or not; a standard evaluation module is used for extracting corresponding time points conforming to gelation dynamic characteristics so as to judge whether the performance test system conforms to the standard or not; analyzing the characteristic characterization value of the test environment through a compensation control module so as to judge whether the reason that the performance test system does not meet the standard is an environment reason or not; and determining a main interference reason based on the correlation coefficient of the test environment characteristic parameter and the sample core temperature, and starting compensation adjustment. According to the invention, the accuracy of the performance test system for injectable hydrogel is obviously improved.

A method for evaluating the rheological properties of at least one gel, consisting in determining the extent of the plastic domain in stress ζc−ζp, and in strain γc−γp, the determination being carried out according to the steps: subjecting at least one sample of at least one gel to oscillating mechanical stresses at a fixed frequency, determining and plotting curves of the elastic modulus G′ and the viscous modulus G″ as a function of the strain and stress, determining ζc and γc at the point of intersection Xc of the curves of G′ and G″ under stress and strain, determining ζp and γp by fixing an arbitrary value of G′ (G′x) that is defined as the entry value into the plastic domain, and calculating ζc−ζp and γc−γp.

A system, apparatus, method, algorithm and / or device (collectively, “system”) for non-contact or contactless ultrasound viscoelastic spectroscopy measures the viscoelastic properties of soft matter through exerting modulated ultrasound pressure waves, so called stress signals and measuring the material deformation, so called strain imaging, over a wide range of frequencies, and may be applied to various fields including but not limited to material science, polymer designing, tissue engineering, cancer drug development and / or biological tissue assessment for disease diagnosis and prognosis. By measuring the elastic and viscous moduli, the phase difference between them, and Poisson's ratio over a wide range of frequencies, this allows for non-destructive tests on soft matter such as biological tissue, by ultrasound probes.

The invention provides a composition containing a DNA fragment and application of lidocaine hydrochloride in improving the stability of the composition containing the DNA fragment and cross-linked hyaluronic acid. The composition comprises cross-linked hyaluronic acid, a DNA (deoxyribonucleic acid) fragment and lidocaine hydrochloride. The lidocaine hydrochloride is found to be capable of improving the stability of PDRN or PN in the storage process of a cross-linked hyaluronic acid system. Besides, the viscoelasticity of the cross-linked hyaluronic acid has an important influence on the stability of the PDRN or PN in a cross-linked hyaluronic acid system, and after the cross-linked hyaluronic acid with specific elastic modulus and viscous modulus is combined with the lidocaine hydrochloride and the PDRN or PN, the storage stability of the PDRN or PN in the cross-linked hyaluronic acid system can be remarkably improved; the combined product can stably keep a uniform and transparent state for a long time, and the effects of resisting inflammation, repairing and promoting collagen synthesis are improved.

This application discloses an injectable filler comprising polyester microspheres and sodium carboxymethylcellulose gel. The sterilized sodium carboxymethylcellulose gel exhibits an elastic modulus G' of 190 to 800 Pa at a frequency of 1 Hz, and a ratio of the elastic modulus G' to the viscous modulus G', G' / G'', of 1.1 to 2.5. The injectable filler exhibits ideal viscoelastic properties, with the polyester microspheres exhibiting good dispersion stability within the formulation and moderate extrusion force. This filler is less likely to cause needle blockage or complications during injection, resulting in high safety, a natural filling effect, and a high aesthetic appearance after injection. Furthermore, the filler exhibits good cohesion, making it less likely to shift after injection.

Disclosed are an ultrasound imaging device and a quantitative evaluation method for myocardial biomechanical properties. By means of processing cardiac ultrasonic echo data, at least one of an intercept of a dispersion curve of a mechanical wave, a slope of the dispersion curve, an elastic modulus, a viscous modulus, an anisotropy parameter, a coupling parameter between a second evaluation parameter and a preload, and a coupling parameter between the second evaluation parameter and an afterload can be obtained. These parameters can evaluate myocardial biomechanical properties of the heart from different dimensions, thereby facilitating a doctor to quantitatively evaluate the myocardium.

The application provides an anti-oil foam stabilizer and a preparation method thereof, and a high-oil-content microfoam fluid and a preparation method thereof. The anti-oil foam stabilizer comprises an emulsifier, a viscoelastic polymer and modified starch. The viscoelastic polymer is an organic polymer with an elastic modulus to viscous modulus ratio of 1<10; and the modified starch is prepared by etherification of starch under alkaline conditions. The anti-oil foam stabilizer added into the microfoam fluid can greatly improve the anti-oil pollution capacity of the microfoam fluid, changes the conventional oil pollution into oil performance promotion, improves the oil content capacity limit of the microfoam fluid technology, and improves the stability of the microfoam fluid.

A polishing pad for chemical mechanical polishing is disclosed, comprising: a polishing layer comprising a polymer matrix, the polymer matrix being a reaction product of an isocyanate-terminated oligomer or polymer and a curing agent blend comprising two or more polyamine curing agents, wherein pores are present in the polymer matrix, such pores being formed by the expansion of pre-expanded fluid-filled polymer microspheres, such expansion occurring during the reaction of the isocyanate-terminated oligomer or polymer with the two or more curing agents, wherein the polishing layer is characterized by one or more of the following: a viscous modulus (G”) at 104°C to a shear loss modulus (G”) at 150°C having a ratio of at least 5:1; and a specific gravity of the polishing layer being less than or equal to 95% of the calculated specific gravity of the isocyanate-terminated oligomer or polymer, the curing agent blend, and the pre-expanded fluid-filled polymer microspheres.

The present invention discloses a low rolling resistance tire bead formula, and relates to the technical field of rubber tires, the tire bead formula comprises a matrix rubber, a reinforcing filler, a plasticizing system, a vulcanization system, a protection system and an additive, and the weight parts of the matrix rubber, the reinforcing filler, the plasticizing system, the vulcanization system and the protection system are 80 phr to 120 phr, 50 phr to 100 phr, 5 phr to 30 phr, 10 phr to 40 phr and 5 phr to 20 phr respectively. The specific value of the loss modulus to the energy storage modulus is calculated, the larger the specific value means that the viscous modulus is large, the energy loss is large, the heat generation is high, the larger the heat and friction force generated by ground friction during tire rolling are, and the more the heat is, the mode of reducing the heat generation of the rubber material by adopting the low-structure large-particle carbon black and the mode of improving the modulus of the rubber material by adopting the polyoctylene rubber are adopted; by adopting a mode of modifying a rubber chain end by a low-rolling-resistance improver, the friction heat is further reduced while the rubber end is connected.

A polishing pad for chemical mechanical polishing comprises a polishing layer which comprises a polymer matrix which is the reaction product of an isocyanate terminated oligomer or polymer, with a curative blend comprising two or more polyamine curatives wherein pores are present in the polymer matrix, such pores being formed by expansion of pre-expanded fluid filled polymeric microspheres such expansion occurring during reaction of the isocyanate terminated oligomer or polymer with the two or more curatives, wherein the polishing layer is characterized by one or more of a ratio of viscous modulus (G″) at 104° C. to shear loss modulus (G″) at 150° C. of at least 5:1; and a specific gravity of the polishing layer is less than or equal to 95% of a calculated specific gravity for the isocyanate terminated oligomer or polymer, the curative blend and the pre-expanded fluid filled polymeric microspheres.

The objective of the present invention is to provide a composition for aerosol food product that, even when the composition is foamed by using an espuma, can achieve a favorable state of the resulting foam, thereby rendering the obtained aerosol food product desirably palatable. The objective is achieved by a composition for aerosol food product, comprising hydroxypropyl methylcellulose and water, wherein a ratio of interfacial elastic modulus to interfacial viscous modulus of the hydroxypropyl methylcellulose is equal to or higher than 2.0 when measured with a tensiometer at 25° C. using a 0.2% by mass aqueous solution, and the like.

The invention discloses a high-temperature-resistant clean solid-free particle type temporary plugging liquid, and belongs to the technical field of oilfield chemistry. The composite gel temporary plugging agent is prepared from the following components in percentage by mass: 93 to 99.5 percent of weighting liquid and 0.5 to 7 percent of salt absorption particles. The high-temperature-resistant clean solid-free particle type temporary plugging liquid has the advantages that the density is adjustable (1.01-1.55 g / cm < 3 >), the working temperature range is wide (40-160 DEG C), the gel breaking phenomenon is avoided after the temporary plugging liquid resists the high temperature of 160 DEG C for 10 days, the rate range of absorbing different types of saline water is 17.4-28.8 g / g, the particle elastic modulus range is 1020-1360 Pa and the viscous modulus is 63.3-118 Pa under the measurement frequency of 10 Hz before aging, the particle elastic modulus range is 1019-1540 Pa, the viscous modulus is 62.4-117 Pa and the viscosity range is 48-200 mPa.s after aging, and the high-temperature-resistant clean solid-free particle type temporary plugging liquid has the advantages that the high-temperature-resistant clean solid-free Compared with the conventional temporary plugging fluid, the temporary plugging fluid has the advantages of high temperature resistance, high salt resistance, good compatibility with hypersalinity formation water and the like.

The invention relates to the fields of medicines and skin medicines, in particular to a pimerolimus composition of a low-viscosity power law fluid and application of the pimerolimus composition. The invention provides a pimerolimus-containing composition, which contains pimerolimus, a rheology modifier and a thickener, and at normal temperature, the viscous modulus of the composition is greater than the elastic modulus of the composition.