171results about How to "Low Young's modulus" patented technology

A vent assembly for use with a respiratory mask of the type used in CPAP treatment. In one embodiment, the vent is made of a thin air permeable membrane (28). The membrane can be made of a hydrophobic material such as expanded polytetrafluoroethylene (PTFE). An expanded PTFE membrane is mounted on a polypropylene scrim. The pores of the ePTFE membrane have a reference pore size of 10 to 15 microns. Alternatively, the vent assembly includes a stainless steel vent having holes with diameters less than about 0.2 mm. In another embodiment, the membrane has a superficial cross-sectional area of approximately 500 mm2. In further embodiments, a vent of a mesh material, e.g., an auxetic vent (200) or a PTFE mesh, may be used as an air permeable membrane, either alone or in combination with a traditional vent structure.

The invention discloses a preparation method of a flexible silica aerogel, relating to a silica aerogel. The invention provides the preparation method of the flexible silica aerogel, which takes methyl alkoxy-series silane as a silicon source precursor. The preparation method comprises the steps of mixing methyl trimethoxysilane or methyl trimethoxysilane, an anhydrous ethanol solution and water, further adding hydrochloric acid, regulating the pH value of the solution to 2-2.5, then adding ammonia water to obtain a sol, standing, then preparing a wet gel, further aging the wet gel, and then drying to prepare the flexible silica aerogel. The prepared flexible silica aerogel has the advantages of low density and high porosity, and simultaneously overcomes the shortcomings of poor integrity and great brittleness. According to the preparation method, the complicated steps of complex solvent exchange and gel modification are not required, so that the operation is simple and easy, the process is controllable, the cost is low, the period is short, and the continuous production can be realized.

The invention relates to a high-strength low-elasticity modulus TiZrNbHf high-entropy alloy and a preparation method thereof; the component of the high-entropy alloy is TiaZrbNbcHfd, wherein a is not less than 20 and not more than 35, b is not less than 20 and not more than 35, c is not less than 20 and not more than 35, and d is not less than 20 and not more than 35. The preparation method of the alloy comprises the following steps: descaling metallurgy raw materials (Ti, Zr, Nb and Hf metals), precisely weighing and proportioning according to a mole ratio for smelting alloy; smelting the alloy by using a non-consumable vacuum arc furnace or a cold crucible suspension furnace, smelting the alloy in a water-cooling copper crucible, suction casting or pouring the alloy in a copper mold through vacuum suction casting or metal mold equipment so as to obtain high-entropy alloy rod or platy material. The high-entropy alloy has high strength, low Young modulus, and excellent structure property stability at a high temperature, the alloy element is non-toxic to human body or low in toxicity; and therefore, the high-entropy has good application prospect on biomedical and high-temperature components.

The invention relates to the technical field of oil well cement paste, in particular to elastic cement paste and a preparation method thereof. The elastic cement paste is prepared from oil well cement paste and elastic materials, wherein the mass of the elastic materials is 3-40% that of cement in the oil well cement paste. Compared with corresponding oil well cement paste, the Young modulus of the obtained elastic cement paste is greatly lowered, and the strength of extension of the obtained elastic cement paste is greatly improved. By adopting the elastic cement paste for carrying out well cementing operation, the problem that microcracks are produced inside set cement and/or micro annular clearances are produced on a cement-formation interface in the trial production processes such as oil gas well follow-up perforation and multi-stage large fracturing due to the inherent brittleness of the set cement is effectively solved. It is shown that the elastic materials can significantly improve the capacity of resisting of set cement for resisting external force deformation, the Young modulus of the set cement is lowered, the strength of extension of the set cement is improved, annulus breakthrough flow is reduced, and the requirement for perforation and multi-stage large-scale fracturing production can be met.

The invention provides a protective cover plate and a flexible display device. The protective cover plate comprises a bending part and a non-bending part, wherein the bending part is located in a bending region, and the non-bending part is located in a non-bending region, and the Young modulus of the bending part is smaller than that of the non-bending part. In this way, since the bending part ofthe protective cover plate has the low Young modulus, the bending part can pass a bending test, meanwhile, the non-bending part has the high Young modulus and therefore can pass a pressure test, and the technical problem is solved that a non-bending part of an existing protective cover plate passes a pressure test with difficulty.

The invention discloses a loudspeaker diaphragm and a loudspeaker. The diaphragm includes two surface layers that are compounded together and at least one intermediate layer located between the two surface layers, wherein at least one of the surface layers is a thermoplastic polyester elastomer film layer, at least one of the intermediate layers is an adhesive layer, a thermoplastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, the thickness of the thermoplastic polyester elastomer film layer is 5-70 microns, and the thickness of the adhesive layer is 1-40 microns.

The invention discloses a loudspeaker diaphragm and a loudspeaker. The loudspeaker diaphragm comprises two surface layers compounded together and at least one intermediate layer located between the two surface layers. At least one surface layer is a thermoplastic polyester elastomer film layer; and the at least one intermediate layer is an adhesive layer. The Young's modulus of the thermoplastic polyester elastomer film layer is 1-1000MPa; the loss factor thereof is larger than or equal to 0.015; and the elastic recovery rate thereof is greater than or equal to 80% after 10% of strain.

A top emission structure color organic EL (electroluminescent) display in which there are bonded together a substrate, having thin film transistors formed thereon, and a transparent substrate, having color-converting filters formed thereon, with an overcoat layer for adjusting the gap between the two substrates and also for relieving stress formed between the substrates without providing a space between the overcoat layers and an electroluminescent device, whereby the organic electroluminescent display has high reliability, without voids that would have an adverse effect on the display performance, and the occurrence of thermal and mechanical stress being suppressed.

The invention discloses a vibration pick-up structure on the basis of a flexible main beam for a vibration energy harvester. The vibration pick-up structure comprises the flexible main beam, a plurality of piezoelectric cantilever beams and mass blocks. The flexible main beam is of a rectangular frame structure, and a rectangular hole is formed in the middle of the flexible main beam; one end of each cantilever beam is fixedly adhered on the upper surface of the flexible main beam, the other end of each piezoelectric cantilever bream is suspended above the rectangular hole, and each mass block is adhered at the suspended end of the corresponding piezoelectric cantilever beam; the multiple piezoelectric cantilever beams are respectively arranged on two sides of the rectangular holes to form forking fingers and are parallel and equidistant to short sides of the rectangular hole. By the aid of the forking finger type multi-cantilever-beam vibration pick-up structure on the basis of the flexible main beam in the design, high-order vibration pick-up frequencies and of a system can be greatly reduced, low-order vibration pick-up frequencies of the system can be reduced, and accordingly a vibration energy harvesting frequency band of the system can be effectively broadened. Compared with the traditional vibration pick-up structure of a vibration energy harvester, the vibration pick-up structure has the advantages that broadband vibration energy can be harvested in ultra-low frequency ranges of frequencies lower than 100Hz, output voltage can be increased, and accordingly the energy harvesting efficiency can be improved.

The invention discloses an elastic well cementation cement paste and a preparation method thereof. The elastic well cementation cement paste comprises the following components in percentage by weight based on 100% of the cement weight: 1-2% of a fluid loss agent, 4-12% of an elastic material, 0.5-1.5% of a dispersing agent, 0.5-2% of a toughening agent, 0.4-1% of a defoaming agent, 0.5-2% of a retarder, 0-50% of a density regulator and 33-50% of fresh water. The method for preparing the elastic well cementation cement paste comprises the following steps of: firstly, uniformly mixing the elastic material, the toughening agent, the density regulator and cement in a dry manner for later use; then uniformly mixing the fluid loss agent, the dispersing agent, the defoaming agent, the retarder and the fresh water in a wet manner; and finally, under a stirring condition, adding an additive obtained after dry mixing into a material obtained after wet mixing, and uniformly stirring to obtain the elastic well cementation cement paste. The elastic well cementation cement paste increases the elasticity of cement stone and reduces the Young modulus, and a cement ring has high impact resistance and toughness, so that the damages of downhole operation to the cement ring are reduced.

The invention provides a solder alloy of Sn, Sb, Ag and Cu, wherein the Sb is about 1.0-3.0 wt %; the Ag is about 1.0 wt % or more and about 2.0 wt % or less; the Cu is about 1.0 wt % or less; and the remainder is Sn. The solder alloy has a comparatively low Young's modulus and sufficient tensile characteristics. Therefore, it resists peeling from the bonded electrode, etc., even though a heat stress is added. Also, a solder which has an excellent solderbility to metal phases such as Cu and Ni can be provided. Therefore, a solder alloy excellent in thermal shock resistance can be provided. The solder alloy may be used for soldering the inside of an electronic component.

The invention relates to a coal reservoir present geostress prediction method, which is characterized in that on the coal rock parameter experiment test and logging curve calculation basis, the quantitative relationship between the static parameter and the dynamic parameter is built; the rock mechanical characteristics of low Young modulus, high poisson ratio, low intensity, easy damage and the like of the coal rock are considered; unknown parameters in the present geostress module based on a Maxwell cola reservoir are obtained through inversion; the coal reservoir geostress profile based on the logging curve is built; the goal of predicting the coal reservoir present geostress is achieved. The targeted performance is high; the coal reservoir present geostress can be accurately predicted;the foundation is laid for the effective exploration and development of coal bed gas; the risk and the cost are reduced; the method can be widely applied to the technical field of coal bed gas exploration and development.

The invention provides an interconnection brazing material and an interconnection forming method thereof. The heating technological temperature of a product applied by the interconnection brazing material is T, the interconnection brazing material contains a component A with the melting point larger than T, a component B with the melting point smaller than T and a third-phase component C with the melting point larger than T; the third-phase component C accounts 0-30% the total mass of the component A, the component B and the third-phase component C. A compound AxBy is formed through a reaction between the component A and the component B at the heating technological temperature; the ratio of amounts of substances of the component A to the component B is larger than x/y, the third-phase component C does not react with the component A or the component B, the hardness of the third-phase component C is smaller than those of the component A, the component B and the compound AxBy. According to the technical scheme, a high-melting-point welding joint is obtained, and the Young modulus and the thermal expansion coefficient of a joint can be adjusted by adjusting the proportion of the components inside the brazing material.

The present invention provides a curable organopolysiloxane composition capable of producing a cured article that can be used as a transducer and provided with excellent mechanical characteristics and/or electrical characteristics. The present invention also relates to a novel curable organopolysiloxane composition for transducer use comprising a curable organopolysiloxane composition and a compound having a highly dielectric functional group.

The invention discloses an ultraviolet light emitting diode packaging structure and a manufacturing method therefor. The ultraviolet light emitting diode packaging structure comprises a bracket, an LED chip and a packaging cover body, wherein a circuit is formed on the bracket; the LED chip is fixed on the bracket and electrically connected with the circuit on the bracket; the packaging structure is characterized in that a groove structure is arranged on the periphery of the lower surface of the packaging cover body; the groove structure is filled with an organic adhesive glue; and the packaging cover body is arranged above the LED chip and connected with the bracket through the organic adhesive glue.

One aspect of this copper alloy for an electronic device is composed of a binary alloy of Cu and Mg which includes Mg at a content of 3.3 to 6.9 atomic %, with a remainder being Cu and inevitable impurities, and a conductivity σ (% IACS) is within the following range when the content of Mg is given as A atomic %,

σ≦{1.7241/(−0.0347×A²+0.6569×A+1.7)}×100.

Another aspect of this copper alloy for an electronic device is composed of a ternary alloy of Cu, Mg, and Zn which includes Mg at a content of 3.3 to 6.9 atomic % and Zn at a content of 0.1 to 10 atomic %, with a remainder being Cu and inevitable impurities, and a conductivity σ (% IACS) is within the following range when the content of Mg is given as A atomic % and the content of Zn is given as B atomic %,

σ≦{1.7241/(X+Y+1.7)}×100

X=−0.0347×A²+0.6569×A

Y=−0.0041×B²+0.2503×B.

The invention discloses a well cementing cement slurry and a preparation method thereof, wherein the well cementing cement slurry comprises the following components in parts by weight: 100 parts of cement, 1-4 parts of an elastic toughness material, 1-4 parts of an expanding agent, 5-10 parts of a latex, 10-100 parts of a density regulator, 1-2 parts of an early strength agent, 2-8 parts of a filtration-reducing agent, 1-2 parts of a drag reducer, 1-10 parts of a retarder, and 20-80 parts of water. The prepared well cementing cement slurry not only has low elastic modulus, but also has high impact resistance and flexural strength as well as compressive strength.

It is intended to provide a dielectric material for polymeric actuator, which has a high dielectric constant, low Young's modulus and excellent operation performance, which can be simply formed, and which has high production efficiency. It is also intended to provide a polymeric actuator which comprises the dielectric material and has excellent operation performance.

The dielectric material for a polymeric actuator comprised of a moveable part of the polymeric actuator driven by an electric field comprising;

• • a block copolymer (A) having a microphase-separated structure including a polymer block (B1) and a polymer block (B2) both of which are immiscible with each other,
  • wherein a main compositional unit in both of the polymer block (B1) and the polymer block (B2) is a (meth)acrylic ester unit, the polymer block (B1) has an alpha-dispersion temperature of 70° C. or more, and the polymer block (B2) has an alpha-dispersion temperature of 25° C. or less. The polymeric actuator comprises the dielectric material provided between electrodes.

A synthetic fiber material made with multipolymer blends which have been fibrillated in oriented film form is provided that is useful as a secondary reinforcement material, which has a low Young's modulus for a more uniform distribution throughout a cementitious mixture incorporating the fiber material, and imparts good finishability, strength, and improved plastic shrinkage crack control, in addition to providing improved conformability within cementitious forms, especially within forms comprising bends equal to or greater than about 45 degrees. Improved cementitious compositions and fiber-reinforced concrete building products incorporating the synthetic fiber materials are also provided, as well as methods for making the synthetic fiber materials.