99results about How to "Improve thermodynamic performance" patented technology

A gas turbine power system for generating energy by means of a gas turbine cycle, wherein heat energy is more effectively used by burning the exhaust gases (109) and the partial oxidation of said exhaust gases (109) is achieved by means of a hypostoichiometric amount of air and steam fed into a catalytic reactor (107) to form a first oxidation stage followed downstream in said turbine (103) by additional oxidation occurring in a power turbine (104) or downstream therefrom, said power turbine being in turn arranged downstream from the catalytic reactor (107). Catalytic partial oxidation may be performed using a supply of an initiating agent, particularly hydrogen. The method is remarkable in that the hydrogen fed into the reactor inlet through an injector (113) is provided by recycling part of the effluent from the reactor, the power turbine or a reforming reactor for reforming part of the fuel gas with a large excess amount of steam for performing catalytic partial oxidation.

A modified low density polyethylene material used for 3D printing comprises, by weight, 80-95 parts of low density polyethylene, 1-10 parts of an inorganic nanoparticle filler, 1-5 parts of a coupling agent, 5-10 parts of a flexibilizer, and 1-5 parts of an antioxidant. The modified low density polyethylene material has the advantages of very good fusion viscosity, very good fluidity, very good heat resistance and very good wear resistance, accords with the characteristics a 3D printing material, and has a wide application prospect in the 3D printing technology.

The invention discloses a conical slit-type hot end heat exchanger of a coaxial pulse tube refrigerator and a manufacturing method. The heat exchanger structurally consists of a hot end flange, a conical slit and a hot end plug, wherein the conical slit is inserted into the hot end flange in a tight fit way, the radius of a circle of contact on the top of a cone frustum is equal to the radius of a cold accumulator and the radius of the bottom of the cone frustum is equal to the radius of the hot end plug. The hot end plug and the hot end flange not only can be connected through bolts to form a detachable split-type hot end heat exchanger, but also can be hermetically welded to form an integrated hot end radiator. The conical slit-type hot end heat exchanger has the advantages that the structure is simple, compact and high-efficiency, the hot end radiating capacity of the refrigerator can be exerted to the utmost extent and the hot end pressure ratio of the pulse tube refrigerator is increased at the same time. The structure can intensively realize the major functions of a high-efficiency hot end heat exchanger, a hot end gas flow guide device of the pulse tube refrigerator and a hot end gas even distributor of the cold accumulator, and can improve the performance of the entire pulse tube refrigerator to a great extent.

The invention discloses an integrated slit cold head of a U-shaped pulse tube refrigerating machine and a manufacturing method. The cold head comprises two parts of a top cover and a lower flange, wherein two cylindrical lug bosses protrude below a big lug boss of the top cover, outer diameters of the two cylindrical lug bosses are respectively equal to inner diameters of a cold regenerator and a pulse tube; the two lug bosses integrally cut and penetrate through a slit in parallel horizontally and uniformly; through insertion holes matched with the cylindrical lug bosses of the top cover are arranged on the lower flange, a sealing groove and a location groove matched with the big lug boss of the top cover are cut on the upper surface of the lower flange, the lower flange, the cold regenerator and the pulse tube are hermetically welded to form an assembly; the top cover and the lower flange not only can be connected by bolts to form a detachable split cold head, but also can be hermetically welded to form an integrated cold head. In the invention, the main functions of three parts of an efficient cold end heat exchanger, a pulse tube cold end gas director and a cold regenerator cold end gas distributor can be intensively realized in an integrated slit cold head structure, the overall performance of the U-shaped pulse tube refrigerating machine is enhanced.

The invention discloses a micro-droplet preparation method applicable to micro-droplet digital PCR (Polymerase Chain Reaction). The method comprises the following steps: preparing a PCR aqueous phase, wherein the PCR aqueous phase comprises an upstream primer, a downstream primer, a PCR template, a PCRmix and double distilled water; sequentially and uniformly mixing the medicines as a reaction aqueous phase standby; sequentially and uniformly mixing the upstream primer, the downstream primer, the PCR template and the PCRmix, dropwise adding the double distilled water, and then taking a solution system as the reaction aqueous phase standby; preparing a PCR oil phase, and sequentially and uniformly mixing glycerin, Trition X-100, Tween-80 and nonyl phenyl ether IgelCO520; adding 1vol of the PCR aqueous phase into 2vol of the PCR oil phase, and performing vortex stirring and reaction to obtain water-in-oil micro-droplets. The preparation method provided by the invention has the advantages that the water-in-oil reaction micro-droplets which are uniform in granularity and stable in thermodynamic property can be conveniently prepared, and the operation of a micro-droplet digital PCR experiment is simplified.

The invention discloses a varied concentration mixed working medium auto-cascade refrigerator, comprising four parts of a normal concentration loop, a first varied concentration loop, a second varied concentration loop and a third varied concentration loop; the normal concentration loop is provided with a compressor, a condenser, a rectifying device, a regenerator, a first throttling element, an evaporator, a second throttling element and a gas-liquid separator which are connected in turn, wherein the first varied concentration loop is provided with a third disconnecting valve 13, a liquid storage tank 9 and a fourth disconnecting valve 14 which are connected in turn; the second varied concentration loop is provided with a first disconnecting valve 11, a gas holder 7 and a second disconnecting valve 12 which are connected in turn; and the third varied concentration loop is provided with a fifth disconnecting valve 15, a gas holder 8 and a sixth disconnecting valve which are connected in turn. The invention dramatically improves the dynamic operation characteristics of the refrigerator at the stage to start lowering temperature, and can realize lower refrigerating temperature and improving thermal dynamic efficiency of the refrigerator. The invention is particularly applicable to the occasions not only needing rapid temperature reduction, but also needing lower refrigerating temperature, thus having favorable application prospect.

The invention discloses a rectifying type variation-concentration self-overlaying gas liquefaction system which comprises a compressor, a condenser, a rectifying device and a feed gas liquefaction loop, wherein the feed gas liquefaction loop comprises a first heat exchanger group, a second heat exchanger group and a first throttle valve arranged between the first heat exchanger group and the second heat exchanger group; and two parallel arranged first variable concentration loop and second variable concentration loop are arranged between the rectifying device and an air suction hole of the compressor. The rectifying device is used for replacing a multistage separation process of the traditional mixed refrigerant gas liquefaction system, and different components of high-pressure liquids are led from the bottom and the top of the rectifying device and are respectively subjected to pressure reduction and then enter the two heat exchanger groups, water equivalent change of a feed gas cooling and liquefaction process is optimized and matched, and variable working condition regulating capacity of the liquefaction system is improved by adopting the variable concentration loops. The invention has the advantages of simple structure, operation reliability, high system liquefaction efficiency and the like, and is suitable for various small and minitype gas liquefaction systems with high performance requirements on variable working conditions.

The invention belongs to the preparation field of shape memory polymers, specifically discloses a liquid crystal epoxy resin-carbon fiber composite material with shape memory properties and a preparation method thereof. The preparation method of the liquid crystal epoxy resin-carbon fiber composite material comprises three steps: (1) carbon fiber surface treatment; (2) composite material mixture preparation; and (3) curing for forming. According to the preparation method, carbon fiber is used for modifying of liquid crystal epoxy resin with branched chains, the cost can be reduced, and the thermodynamic properties of the material can be improved; and the liquid crystal epoxy resin-carbon fiber composite material prepared by the preparation method has the shape memory property, is high in response rate, is high in recovery stress, and can be applied to the technical field of biomedicine, aerospace and other sciences.

The invention discloses a polycarbonate composition for LDS with good thermal stability. The polycarbonate composition is prepared from the following components in parts by weight: 60-90 parts of polycarbonate, 2-30 parts of an LDS additive, 0.1-5 parts of a heat stabilizer and 0.3-3 parts of an antioxidant, wherein the antioxidant is prepared from a hindered phenolic antioxidant and a phosphite antioxidant, and the heat stabilizer is prepared from a metal compound, layered double-metal hydroxide and an ultraviolet absorbent. According to the polycarbonate composition disclosed by the invention, by virtue of optimization treatment on the content of each component, particularly combination use of the metal compound, the layered double-metal hydroxide and the ultraviolet absorbent and further combination use of the hindered phenolic antioxidant, the phosphite antioxidant and the heat stabilizer, the components take synergistic effect, thermal degradation of the polycarbonate composition for the LDS is greatly inhibited, the mechanical properties and the processability of the polycarbonate composition for the LDS are improved, and meanwhile, the polycarbonate composition for the LDS is capable of resisting precipitation, solvent extraction and salinization without influencing chemical plating in the formation process.

The invention belongs to the field of benzoxazine resin in polymer synthetic materials and discloses side-chain phthalonitrile modified benzoxazine resin, a preparation method and an application. The resin has a general structural formula shown in a formula I, wherein n is an integer larger than or equal to 1. By means of the characteristic of strong molecular structure design of a benzoxazine monomer, a polymerizable phthalonitrile group is introduced into an aromatic diamine compound through a conventional chemical reaction, then the aromatic diamine compound carrying the phthalonitrile group, paraformaldehyde and bisphenol A have condensation polymerization, and the side-chain phthalonitrile modified benzoxazine resin is prepared. Phthalonitrile which is a polymerizable group is introduced into benzoxazine, so that phthalonitrile can participate in curing, the crosslinking density of polybenzoxazine resin can be further increased, and the thermal stability of polybenzoxazine can be further improved. The preparation method is simple and convenient, a synthesis period is short, the yield is high, and raw materials are easy to obtain.

The invention provides a green and efficient concentrated solution for a hydraulic support system and a preparation method of the green and efficient concentrated solution. The concentrated solution is prepared from components in percentage by mass as follows: 5%-8% of soybean oil, 3%-5% of coconut oil, 4%-6% of potassium hydroxide, 2%-3% of trans-polyether, 7%-10% of polyglutamic acid, 10%-12% ofsebacic acid, 1%-2% of fatty alcohol polyoxyethylene ether, 6%-10% of triethanolamine, 2%-4% of monoethanolamine, 10% of glycol, 0.1%-0.3% of methylbenzotriazole, 1%-2% of trimethyl hexahydrotriazine, 0.1%-0.3% aqueous polyether, 0.01%-0.02% of Congo red and the balance of reagent process water. The concentrated solution is obtained through multiple steps as follows: carboxylic acid amide is prepared from the soybean oil, the coconut oil, triethanolamine and monoethanolamine through a saponification reaction, and methylbenzotriazole, the sebacic acid and carboxylic acid amide are compounded with a metal sustained release agent.

The invention discloses a polybenzimidazole and its derivative functional graphene oxide. The derivative functional graphene oxide is prepared by grafting polybenzimidazole and its derivative to the surface of the graphene oxide; adding inorganic monomer in graphene oxide suspension liquid; stirring dispersedly and evenly; adding dehydration cyclizing agent, and reacting under 150-200 DEG C. The functional graphene oxide is high in nitrogen element content and mass in benzimidazole functional groups; the functional graphene oxide shows good dispersibility and keeps excellent compatiability with organic polymer materials. After adding the polybenzimidazole and its derivative functional graphene oxide to SPEEK as the nanofiller; effective acid-alkali interaction can be formed between the imidazole group at the graphene surface and the sulfonic acid group in SPEEK, so that the conductivity, the mechanical performance and dimension stability of a nanometer composite proton exchange membrane are improved; in the post application, the polybenzimidazole and its derivative functional graphene oxide can improve the high temperature performance of the fuel cell.

The invention discloses a lactobacillus rhamnosus exopolysaccharide, and a preparation method and application thereof, and belongs to the technical field of microorganisms. According to the invention, a lactobacillus rhamnosus strain separated from Xiangshuangpao yoghurt is used as an original strain to produce exopolysaccharide, the exopolysaccharide is a uniform component, and the molecular weight of the exopolysaccharide is 88650 Da; and the lactobacillus rhamnosus exopolysaccharide comprises mannose, glucuronic acid, glucose, xylose, galactose and arabinose. The exopolysaccharide has a good in-vitro hypoglycemic effect, has good in-vitro alpha-glucosidase inhibition capacity through detection, and is simple in process, wide in market prospect, stable in thermodynamic property and suitable for large-scale production. Therefore, the polysaccharide is a potential active ingredient for preventing and treating diabetes mellitus. Besides, as a fermentation product of probiotics, compared with common chemical medicines in the field of blood sugar reduction, the fermentation product has the advantages of simple and easily available active ingredients, low price, no side effect and the like, and has great application value.

Aggregation is a major cause of the misbehavior of proteins. A system for modifying a protein to create a more stable variant is provided. The method involves identifying non-conserved hydrophobic amino acid residues on the surface of a protein, suitable for mutating to more hydrophilic residues (e.g., charged amino acids). Any number of residues on the surface may be changed to create a variant that is more soluble, resistant to aggregation, has a greater ability to re-fold, and/or is more stable under a variety of conditions. The invention also provides GFP, streptavidin, and GST variants with an increased theoretical net charge created by the inventive technology. Kits are also provided for carrying out such modifications on any protein of interest.

A heat sink (10, 100) for dissipating heat from an electrical device comprises a base (20) having a generally flat top surface (21); a plurality of fins (40, 400) arranged on the top surface (21) of the base (20) such that a running direction of the fins (40, 400) is oblique to an in-flow (A) of heat flow; and a plurality of channels (60) defined between each two adjacent fins (40, 400).

The invention belongs to the technical field of optical information storage. A high-density and long-life data storage disk is characterized in that the surface of a glass substrate is covered with a thin film made from hybrid materials or the internal surface of a flat-bottom container is covered with a plate sample made from the hybrid materials; and high-density gold nanorods are dispersed in the hybrid materials. The data storage disk prepared by the method is stable in thermodynamic property and capable of storing recorded data for a long time.

The invention discloses a nano-chitosan-modified cotton fiber and a preparation method of the nano-chitosan-modified cotton fiber. The preparation method of the nano-chitosan-modified cotton fiber comprises the steps: the cotton fiber is sent into a sodium hydroxide solution to be stirred, washed and dried, and sent into a sodium periodate solution to be stirred away from light to obtain an activated cotton fiber; nano chitosan, a cellulose dispersing agent and acetic acid are evenly mixed, isopropyl triisostearoyltitanate is added to be stirred, under the stirring state, tetraethylortho silicate is added, stirring is continued, and vacuum defoamation is conducted to obtain a pretreated nano chitosan solution; and the activated cotton fiber is steeped in the pretreated nano chitosan solution to be subjected to pulsed microwave treatment, filtered, and aired at the room temperature to obtain the nano-chitosan-modified cotton fiber. The cotton fiber is modified through the nano chitosanand thus has a good heat-insulating foundation and excellent antibacterial and anti-ultraviolet properties, the method is environmentally friendly, and the nano-chitosan-modified cotton fiber can be applied to the fields of medical health and antibacterial fabrics.

The invention provides a combined brick. The combined brick is prepared from a mixture through molding and firing, wherein the mixture comprises mullite, andalusite, magnesium aluminate spinel, cordierite, tabular corundum and silicon dioxide. Due to the addition of the components and control of the content of the components, the combined brick has better comprehensive thermodynamic property. The invention also provides a method for preparing the combined brick. The preparation method combines an integral molding technology with a pouring centrifugal shaping technology, so that the combined brick has better overall performance.

The invention belongs to composites and the field of composite preparation, and discloses a shape memorizing liquid crystal epoxy resin-glass fiber-silicon dioxide composite and a preparation method thereof. The preparation method comprises the following steps: dissolving liquid crystal epoxy resin and a curing agent into acetone, then adding silicon dioxide subjected to surface treatment by a silane coupling agent so as to obtain a composite mixed liquid, and pouring the obtained composite mixed liquid into a mould laid with glass fiber subjected to surface treatment to be reacted and cured so as to obtain the liquid crystal epoxy resin-glass fiber-silicon dioxide composite with the shape memorizing performance. The obtained material has excellent mechanical performance and shape memorizing performance, and can be applied to the fields of science and technology such as biomedicine and aerospace.