Abstract: An ultrahigh-temperature wind tunnel erosion testing system is provided, including a fuel system (1), an erosion system (2), an erosion spray gun (3), a test piece fixture (5) and a testing device; the erosion spray gun (3) is connected with the fuel system (1) and the erosion system (2) respectively; the erosion spray gun (3) is arranged on a lifting and rotating mechanism (4); the test piece fixture (5) is arranged on one side of the lifting and rotating mechanism (4) and is opposite to a nozzle of the erosion spray gun (3); and the testing device is connected with the test piece fixture (5). The plurality of groups of test pieces are circlewise arranged around the lifting and rotating mechanism (4).

Abstract: A system for testing fatigue performance of material in low-temperature liquid hydrogen environment, which relates to the technical field of mechanical property test platforms, includes a jacket cover. A hydrogen sensor is provided at the top of and within the jacket cover; a rack, a liquid hydrogen tank and a liquid nitrogen tank are provided in the jacket cover; a loading mechanism and a liquid hydrogen containing mechanism are provided on the rack, the loading mechanism is connected to the rack, and the bottom of the loading mechanism extends into the liquid hydrogen containing mechanism; the liquid hydrogen tank and the liquid nitrogen tank both communicate with the liquid hydrogen containing mechanism; and the loading mechanism is configured for providing tension or pressure to a sample. The liquid hydrogen containing mechanism is provided with a cooling channel located around a sealing gasket, the cooling channel communicates with a thermostat.

Abstract: An ultrahigh-temperature wind tunnel erosion testing system is provided, including a fuel system (1), an erosion system (2), an erosion spray gun (3), a test piece fixture (5) and a testing device; the erosion spray gun (3) is connected with the fuel system (1) and the erosion system (2) respectively; the erosion spray gun (3) is arranged on a lifting and rotating mechanism (4); the test piece fixture (5) is arranged on one side of the lifting and rotating mechanism (4) and is opposite to a nozzle of the erosion spray gun (3); and the testing device is connected with the test piece fixture (5). The plurality of groups of test pieces are circlewise arranged around the lifting and rotating mechanism (4).

Abstract: The present invention discloses nerve growth factor composition and an injection powder comprising the following components: 10 ?g/mL-100 ?g/mL of a nerve growth factor; 10 mg/mL-80 mg/mL of disaccharide stabilizer; 0 mg/mL-30 mg/mL of an amino acid stabilizer; 0.01 mg/mL-1 mg/mL of surfactant, 10 mg/mL-50 mg/mL of a supporting agent; a pH buffer for maintaining the nerve growth factor composition at 6.0-7.4, and solvent being water. The nerve growth factor composition and the injection powder can avoid the potential risk resulting from the virus of other unknown components carried in albumin by using a disaccharide or a combination of a disaccharide and an amino acid instead of albumin as a stabilizer; not only have protective effect on mNGF, but also can ensure the stability of hNGF and rhNGF in the preparation, transportation and storage processes, and have better medication safety and quality control.

Abstract: The present invention discloses a nerve growth factor composition and an injection powder comprising a nerve growth factor, a stabilizer, a pH buffer, and water, wherein the stabilizer is at least one of sorbitol, dextran, trehalose, raffinose and mannitol. By using a carbohydrate or sugar alcohol as a stabilizer, the present invention can avoid the potential risk resulting from the presence of viruses or other unknown components in albumin. In addition to the nerve growth factor, only the stabilizer and the pH buffer are contained, without conventional surfactant and supporting agent, increasing safety and significantly reducing incidence of the adverse reactions. The present invention not only provides a protective effect on mNGF, but also can ensure good stability of hNGF and rhNGF in the preparation, transportation and storage processes, and has better medication safety and quality control.

Abstract: The invention relates to a design method of high-temperature nickel-based bolts based on damage tolerance theory, comprising the following steps: S1: acquiring operating parameters for the design; S2: selecting a material for bolts; S3: acquiring mechanical properties of the materials; S4: determining a pretension stress ?p of a single bolt; S5: determining the service stress ?s under the steady state; S6: determining the number n, the effective cross-section area A and the distribution of bolts; S7: determining a maximum allowable crack dimension; S8: calculating the maximum allowable service stress ?th using the crack propagation threshold Kth at the design temperature; S9: comparing the service stress ?s and the maximum allowable service stress ?th, if ?s is smaller than ?th, then the bolts are safe in the design life; otherwise, return to step S4 and reduce the pretension stress ?p.

Abstract: The present invention discloses nerve growth factor composition and an injection powder comprising the following components: 10 ?g/mL-100 ?g/mL of a nerve growth factor; 10 mg/mL-80 mg/mL of disaccharide stabilizer; 0 mg/mL-30 mg/mL of an amino acid stabilizer; 0.01 mg/mL-1 mg/mL of surfactant, 10 mg/mL-50 mg/mL of a supporting agent; a pH buffer for maintaining the nerve growth factor composition at 6.0-7.4, and solvent being water. The nerve growth factor composition and the injection powder can avoid the potential risk resulting from the virus of other unknown components carried in albumin by using a disaccharide or a combination of a disaccharide and an amino acid instead of albumin as a stabilizer; not only have protective effect on mNGF, but also can ensure the stability of hNGF and rhNGF in the preparation, transportation and storage processes, and have better medication safety and quality control.

Abstract: The present invention discloses a nerve growth factor composition and an injection powder comprising a nerve growth factor, a stabilizer, a supporting agent, a pH buffer, water and optionally a surfactant. The stabilizer may be selected from arginine, glutamic acid, glycine and isoleucine. By using an amino acid instead of albumin as a stabilizer, the nerve growth factor composition and the injection powder can avoid the potential risk of viral or other unknown components carried in albumin, ensuring the stability of hNGF and rhNGF during preparation, transportation and storage processes, and allowing for increased safety and quality control.

Abstract: The present invention discloses a nerve growth factor composition and an injection powder comprising a nerve growth factor, a stabilizer, a pH buffer, and water, wherein the stabilizer is at least one of sorbitol, dextran, trehalose, raffinose and mannitol. By using a carbohydrate or sugar alcohol as a stabilizer, the present invention can avoid the potential risk resulting from the presence of viruses or other unknown components in albumin. In addition to the nerve growth factor, only the stabilizer and the pH buffer are contained, without conventional surfactant and supporting agent, increasing safety and significantly reducing incidence of the adverse reactions. The present invention not only provides a protective effect on mNGF, but also can ensure good stability of hNGF and rhNGF in the preparation, transportation and storage processes, and has better medication safety and quality control.

Abstract: The invention relates to a design method of high-temperature nickel-based bolts based on damage tolerance theory, comprising the following steps: S1: acquiring operating parameters for the design; S2: selecting a material for bolts; S3: acquiring mechanical properties of the materials; S4: determining a pretension stress ?p of a single bolt; S5: determining the service stress ?s under the steady state; S6: determining the number n, the effective cross-section area A and the distribution of bolts; S7: determining a maximum allowable crack dimension; S8: calculating the maximum allowable service stress ?th using the crack propagation threshold Kth at the design temperature; S9: comparing the service stress ?s and the maximum allowable service stress ?th, if ?s is smaller than ?th, then the bolts are safe in the design life; otherwise, return to step S4 and reduce the pretension stress ?p.