23results about How to "Sufficient supply" patented technology

The invention discloses recombinant escherichia coli with high yield of N-acetylneuraminic acid and application of the recombinant escherichia coli, and relates to the technical field of biological genetic engineering. The invention relates to a recombinant escherichia coli, which is characterized in that the escherichia coli is taken as a host, and free expression of an N-acetylmannosamine epimerase gene yihS from Streptomyces xiamenensis or an N-acetylmannosamine epimerase gene ce3 from Bacteroides polymorpha and an exogenous N-acetylneuraminic acid lyase gene nano A is carried out; and carrying out recombinant expression on N-acetyl hexosamine 1-kinase nahK, a UDP-N-acetyl glucosamine pyrophosphorylase gene glmU and a UDP-N-acetyl glucosamine-2-epimerase gene neuC in the other synthetic route of the ManNAc. According to the recombinant escherichia coli with high yield of N-acetylneuraminic acid, the yield of N-acetylneuraminic acid can reach 23.08 g / L under a shake flask fermentation condition; a two-stage batch feeding strategy is adopted, the yield of N-acetylneuraminic acid in a 5L fermentation tank reaches 71.25 g / L, the molar conversion rate of GlcNAc reaches up to 57.60%, and the method has the potential of industrial application.

The utility model discloses a same side heat exchange hydrogen production system with air cooling and waste heat recovery system belongs to hydrogen production system technical field, including high pressure steam pipeline, high pressure steam pipeline one end is connected outside steam source, and the other end is connected gas mixer, anode entrance connects air heater, and air heater connects anode heat exchanger, and the first medium side one end of anode heat exchanger is connected air heater, and the other end is connected cathode cooler. Through the external supply water vapor, need not set up steam generator in the system, through the cathode tail gas, anode tail gas carries out two step preheating to air, reduces the load of air heater, and the heat of cathode tail gas reduces also can reduce the load of condenser after cathode tail gas passes two step heat exchange, part cathode tail gas is introduced into hydrogen production system again, can guarantee having hydrogen in mixed gas again, can introduce part water vapor, reduces the supply amount of external water vapor, has reduced energy loss as far as possible.

The invention relates to the technical field of grain and oil by-product high-value utilization and food functional ingredient preparation, in particular to a nitrogen-rich mesoporous carbon-based cholesterol adsorption ingredient as well as a preparation method and application thereof. According to the method, soybean meal and rice bran are taken as a carbon source and an endogenous nitrogen source, and urea or melamine is compounded as an exogenous nitrogen-rich precursor, so that an internal-external synergistic nitrogen-rich system is constructed; the method comprises the following steps: compounding a zinc chloride or potassium hydroxide chemical activator with a ferric chloride catalytic graphitizing agent to form a nitrogen-rich-catalytic synergistic conversion system; the method comprises the steps of raw material pretreatment, nitrogen-rich slurry preparation, catalytic activation precursor preparation and the like. The prepared carbon-based ingredient has a developed mesoporous structure and high-content alkaline nitrogen-containing functional groups, and is large in cholesterol adsorption capacity and high in selectivity, and the raw materials are grain and oil processing byproducts, so that the cost is low, and the carbon-based ingredient is green and environment-friendly; the preparation process has the advantages of controllable parameters and good repeatability, is suitable for industrial production, and provides a new technical path for the development of functional food ingredients for reducing blood fat.

The invention relates to the technical field of fruit and vegetable cultivation, and provides a water chestnut fertilization influence analysis method based on principal component analysis, which comprises the following steps: setting a plurality of field trials for different nitrogen, phosphorus and potassium fertilization level treatment; measuring plant growth indexes, yield indexes, corm quality indexes and soil physicochemical property indexes of the treated water chestnuts; performing principal component analysis on the measured multiple indexes, and extracting principal components of which the characteristic values are greater than 1; calculating comprehensive scores of the processing according to the scores of the principal components and sorting the comprehensive scores; according to the comprehensive score, evaluating the comprehensive influence of different fertilization treatments on the growth, yield, quality and soil properties of the water chestnuts, and screening out an optimal fertilization combination. According to the method, the matching of medium-low nitrogen and phosphorus and medium-high potassium is clear, so that high yield and high quality are guaranteed, soil acidification can be effectively relieved, excessive consumption of nutrients is avoided, synergism of fertilizer saving, efficiency improvement, soil health and quality improvement is realized, and data support and quantitative decision basis are provided for scientific fertilization of the water chestnuts.

The invention provides a water fertilizer for preventing the bending phenomenon of cut-flower roses as well as a preparation method and application of the water fertilizer, and belongs to the technical field of fertilizers. Comprising the following components: potassium nitrate, monopotassium phosphate, calcium nitrate terahydrate, ammonium dihydrogen phosphate, calcium sulfate, magnesium sulfate heptahydrate, chelated zinc, borax, sodium bicarbonate, chelated iron, chelated manganese, chelated copper and sodium molybdate dehydrate. The preparation method of the water fertilizer for preventing the bending phenomenon of the cut-flower roses is simple, quick in effect, low in cost, environment-friendly and safe, and the growth and development process of the cut-flower roses is accurately regulated and controlled by guaranteeing normal water fertilizer supply. The occurrence rate of the bending phenomenon of the cut-flower roses is obviously reduced, the quality of the cut-flower roses is effectively improved, and the quality improvement and efficiency improvement of the industry are promoted.

The invention belongs to the technical field of semiconductor manufacturing, micro electro mechanical systems and precise optical coating, and particularly discloses a method for activating the surface of a substrate in situ in an atomic layer deposition chamber, which comprises the following steps: selecting a donor substrate and a target substrate to be activated; etching the donor substrate to obtain a donor substrate with high-density hydroxyl groups; placing the donor substrate with the high-density hydroxyl groups and a target substrate to be activated in the same atomic layer deposition process chamber; and inert carrier gas is introduced into the atomic layer deposition process chamber, purging process parameters are controlled, and in-situ activation of the target substrate is completed. According to the method for activating the surface of the substrate in situ in the atomic layer deposition chamber, after the surface of the substrate is activated by the method, protective films such as aluminum oxide and the like are subjected to atomic layer deposition, so that the adhesive force and long-term reliability of the protective films on a whole device can be ensured; and interface engineering technical support is provided for manufacturing of high-performance and high-reliability three-dimensional heterogeneous integrated devices and micro-nano sensors.

The utility model discloses a fan pressurization adjusting device which comprises a pressurization machine, a gas flow rate sensor is installed at the gas inlet end of the pressurization machine, and an adjusting structure is installed at one end of the gas flow rate sensor. In a normal state, a reinforcing part is closed, the flow rate of coal gas is adjusted through an adjusting valve, if the flow rate value is smaller than the minimum limit value of the adjusting valve, the reinforcing part works, namely, a driving assembly works, under connection of a driven bevel gear, a rotating rod rotates on a fixed sleeve through a bearing, and fan blades rotate accordingly; and the gas flow flowing through the connecting pipe is accelerated and pressurized until the gas flow rate sensor detects that the gas flow rate reaches a standard value, so that the normal work of the pressurizing machine is ensured, the shutdown of the pressurizing machine is avoided, the sufficient gas supply is ensured, the normal work of the combustor is ensured, the combustion efficiency is ensured, the required temperature is reached, and the continuity of industrial production and the product quality are ensured.

This application relates to the field of two-dimensional semiconductor material preparation technology, specifically to a method for preparing monolayer molybdenum disulfide by dual-sulfur source chemical vapor deposition, comprising the following steps: Step 1, providing a chemical vapor deposition reaction chamber having an upstream region, a growth region, and a downstream region; Step 2, arranging a molybdenum-containing precursor in the growth region, and arranging a substrate above or opposite to the molybdenum-containing precursor; Step 3, arranging a first sulfur-containing precursor in the upstream region and a second sulfur-containing precursor in the downstream region; Step 4, introducing a carrier gas into the reaction chamber and heating it to cause the first sulfur-containing precursor, the second sulfur-containing precursor, and the molybdenum-containing precursor to volatilize and undergo a chemical vapor deposition reaction on the substrate surface to form a monolayer molybdenum disulfide. This invention employs a dual-sulfur source strategy, achieving large-size, uniform, and low-defect preparation of monolayer MoS2, facilitating widespread application.

The application discloses a novel positive pressure type chemical oxygen respirator and relates to the technical field of breathing equipment, which aims to solve the technical problems that the chemical oxygen respirator is difficult to achieve reliable positive pressure protection effect and the mask is easy to fog and frost in the prior art. The novel positive pressure type chemical oxygen respirator comprises a breathing mask, an exhalation pipe, a main machine backpack, an exhalation bag, an inhalation pipe, an oxygen generation tank and a cooling box, the oxygen generation tank and the cooling box are fixed in the main machine backpack, the breathing mask is connected with the exhalation bag, and the exhalation pipe enters the main machine backpack to communicate the exhalation bag with the oxygen generation tank. The novel positive pressure type chemical oxygen respirator can provide positive pressure protection, can defog and self-clean the eyepiece of the breathing mask, and can prevent the vision of a user from being blocked.

The utility model discloses a landscape water body water quality purification system, and belongs to the technical field of water quality purification, the landscape water body water quality purification system comprises a sedimentation tank, a biological filtration tank and a purification box, a water inlet of the sedimentation tank is fixedly connected with a water inlet pipe; landscape water is injected into the sedimentation tank through the water inlet pipe, large-particle suspended solids are intercepted through the grating, fine particles of the landscape water can be conveniently precipitated in the sedimentation tank subsequently, the precipitated water body is injected into the biological filtration tank through cooperation between the water pump and the conveying pipe, and under the action of the aeration device, the biological filtration tank can be used for biological filtration. Microorganisms in the microorganism culture box are used for degrading organic matters and nitrogen and phosphorus pollutants, and then a water body treated by the biological filtration tank is injected into the purification box through the water pump and the conveying pipe, so that residual pollutants are conveniently removed through the activated carbon adsorption plate; according to the water quality purification system, suspended solids and soluble pollutants can be removed at the same time through cooperation of the sedimentation tank, the biological filtration tank and the purification box, and the purification effect is more comprehensive.

This invention relates to the field of garbage truck technology, and discloses an anti-drip structure and a garbage truck. The anti-drip device includes: a sewage guiding structure with a guiding channel for sewage to flow in, the sewage guiding structure extending along the width direction of the filler and located below the connection position between the filler and the truck body; a storage structure with a receiving cavity for containing sewage, the receiving cavity communicating with the guiding channel; and a cleaning component disposed on one side of the sewage guiding structure. The sewage guiding structure of this invention extends along the width direction of the filler, and a cleaning component is disposed on one side of the sewage guiding structure. The sewage guiding structure can effectively receive sewage leaking from the connection position, and the cleaning component can periodically and actively clean the guiding channel of the sewage guiding structure, ensuring the sewage collection effect while also ensuring that the guiding channel remains unobstructed, effectively solving the problem of poor reliability of the sewage collection structure in existing garbage trucks.

This application relates to the field of carbon quantum dot traditional Chinese medicine materials, and particularly to the application of human hair carbon in a hematopoietic reagent for aplastic anemia. The application includes: using human hair carbon quantum dots derived from human hair carbon in the preparation of a hematopoietic reagent for chemotherapy-related anemia. This application uses human hair carbon, a traditional Chinese medicine derived from clinical waste, as the core precursor to prepare human hair carbon quantum dots (CrCi-CDs), and applies CrCi-CDs to the development of a hematopoietic reagent for chemotherapy-related anemia. From the raw material source, preparation process, mechanism of action to clinical transformation of the whole chain, it specifically solves the core defects of high raw material cost and unclear biological toxicity risk when existing chemically synthesized carbon dots are used for the treatment of chemotherapy-related anemia, and at the same time meets the clinical drug safety requirements of patients with chemotherapy-induced aplastic anemia.

According to the blowing mold and the blowing needle, a material storage cavity is formed in the blowing mold and used for storing additional plastic blanks, and the blowing needle is matched with the material storage cavity to scrape the plastic blanks in the material storage cavity in the moving process and accurately guide the plastic blanks to a bottle opening forming area, so that sufficient material supply at a bottle opening is ensured; therefore, the completeness and the wall thickness uniformity of bottle opening forming are obviously improved. The utility model does not need to greatly reform the existing blow molding equipment, can be easily integrated into the existing production line only by additionally arranging the material storage cavity and the port structure in the mold, has the characteristics of low implementation cost and strong compatibility, enhances the sealing performance and the service life of the product due to the improvement of the bottle opening forming quality, and is suitable for large-scale production. And the production rejection rate is obviously reduced, and the overall production efficiency and economic benefits are improved.

This application belongs to the field of automated storage and retrieval systems (AS / RS) technology and discloses a leak-free, sealed, automatic feeding device for lithium hexafluorophosphate. The device includes a synthesis tank assembly, a feeding and storage hopper assembly, a first dynamic sealing roller assembly, a second dynamic sealing roller assembly, a sealing cap assembly, a follow-up transmission assembly, and a speed-increasing transmission assembly. The feeding and storage hopper assembly is arranged inside the synthesis tank assembly in a manner that allows it to reciprocate around a horizontal axis, forming a dispersed feeding pattern. The first and second dynamic sealing roller assemblies are rotatably arranged in the middle and bottom of the feeding and storage hopper assembly, respectively, forming a two-stage rolling feeding and airtight structure. The sealing cap assembly covers the top of the feeding and storage hopper assembly to form a sliding seal. The follow-up transmission assembly utilizes the reciprocating rotation of the feeding and storage hopper assembly, without external power driving the second dynamic sealing roller assembly to rotate. This application achieves fully sealed, leak-free, uniform, and stable automatic storage and feeding.

This invention discloses a method for co-flotation recovery of clean coal from coal gasification fine slag and waste plastics, comprising the following steps: 1) mixing waste plastic particles, coal gasification fine slag, and water, adding a modifying agent, and grinding to obtain a grinding product; 2) filtering the grinding product, and then stacking the filter cake for settling to obtain a settling product; 3) flotating the settling product to separate low-ash clean coal and high-ash tailings. This invention, through precise control of grinding mixing and settling modification, combined with the modifying and strengthening effect of maleic anhydride-grafted polyethylene wax, significantly improves the hydrophobicity of the residual carbon surface, resulting in clean coal with lower ash content and higher calorific value. It can be directly used for coal blending, coal briquette preparation, or as a raw material for coal chemical industry, greatly increasing added value. The tailings, after treatment, can be used as building materials without secondary pollution, forming a closed-loop system of "solid waste treatment - resource output - end-use application," suitable for large-scale industrial promotion.

A kind of balanced shaft driven 2.0T engine full variable oil pump, belong to engine lubrication system technical field.Pump body and pump cover are fixed by bolt and form sealed working chamber one, are equipped with rotor assembly etc., rotor and driving shaft are interference fit, blade separates sealed working chamber two between eccentric ring and rotor;Eccentric ring is connected with pump body through swing pin, eccentric spring abuts against eccentric ring, drive gear is fixed to the end of driving shaft, and is engaged with balance shaft driving gear, balance shaft positioning pin positions and fixes balance shaft.The utility model discloses through displacement adjustment, stable power transmission, fast response capability and reliable sealing and protection design, effectively solve the problem of traditional oil pump in oil supply, driving mode and structure layout etc., significantly improve the fuel economy, power performance and reliability of engine, prolong the service life and reduce maintenance cost simultaneously, have important practical value.

The invention relates to the technical field of semiconductor composite materials, and discloses a nano semiconductor composite material and a preparation method and application thereof, the nano semiconductor composite material comprises a substrate, a transition metal nitride buffer layer and a co-doped aluminum nitride single crystal film; the transition metal nitride buffer layer is deposited on the surface of one side of the substrate, and the co-doped aluminum nitride single crystal film grows on the side, away from the substrate, of the transition metal nitride buffer layer; from the whole scheme of the invention, through the synergistic effect of the component design and the process steps, the nano semiconductor composite material realizes breakthrough in multiple performance dimensions. The transition metal nitride buffer layer is combined with the co-doped structure, so that the problem that the crystallization quality and the electrical property of a traditional AlN-based material are difficult to consider at the same time is solved; through precise regulation and control of substrate pretreatment and each layer growth process, the defect problem caused by interface mismatch is effectively relieved, and the overall stability of the material is improved.

This utility model discloses a high-efficiency drying device for pharmaceuticals, relating to the field of pharmaceutical technology. Its key technical features include: a drying chamber with a hinged door on one side; multiple exhaust holes on the top side wall of the drying chamber; a gas supply assembly connected to the bottom of the drying chamber; a heating chamber located at the bottom of the drying chamber, connected to the gas supply assembly at its bottom; multiple layers of electric heating mesh horizontally arranged inside the heating chamber; an air outlet on the top of the heating chamber; and an upward-blowing fan inside the air outlet. A placement frame is installed inside the drying chamber, its top connected to the top of the drying chamber via a lifting assembly. The placement frame includes multiple vertically distributed limiting rings supporting a placement bucket. A supporting ring adapted to the limiting rings is fixedly installed on the top of the placement bucket. Multiple airflow holes are evenly distributed on the side wall of the placement bucket, which is used to hold medicinal materials. This utility model balances efficiency and compactness in drying.

This invention discloses a method for preparing Yuanjiang asparagus extract and its application. The method uses fresh Yuanjiang asparagus tender stems as raw material. After selection, washing, freeze-drying, pulverizing, and sieving, choline chloride and 1,2-propanediol eutectic solvent are added for constant-temperature extraction. After ultrasonic temperature control, cellulase and pectinase are added for complex enzymatic hydrolysis. After heating to inactivate the enzymes, centrifugation is performed, and the supernatant is collected to obtain the crude extract of Yuanjiang asparagus saponins. This method has high extraction efficiency, and the obtained asparagus saponins have strong antioxidant activity, exhibiting strong scavenging ability against DPPH, ABTS, and hydroxyl radicals, as well as Fe... 2+ The chelation rate was high, and it showed significant in vitro inhibitory effects on the proliferation of human colorectal cancer cells Caco-2 and human hepatocellular carcinoma cells HepG2. The raw material used in this method is fresh, tender stems of Yuanjiang asparagus, which is widely available and of excellent quality. The extraction process is green, environmentally friendly, and simple, not only improving the comprehensive utilization value of Yuanjiang asparagus but also providing a new method for extracting natural saponin active ingredients. The obtained asparagus saponins can be used to develop antioxidant and anti-tumor functional foods, showing potential market prospects.

This utility model discloses a natural water source fire-fighting water intake device and fire-fighting water supply system, including a water intake device; a water intake port is provided on the side wall of the water intake device at the lowest effective water level of the natural water source; the water intake port is equipped with a normally open gate and a filter screen; the water intake device is equipped with an internal level transmitter and an external level transmitter; both the internal and external level transmitters are connected to a fault alarm device, and a fault alarm is triggered when the measured value of the external level transmitter is more than 5% higher than the measured value of the internal level transmitter; the water intake device is equipped with a water delivery pipe that runs through the side wall; one end of the water delivery pipe is connected to a fire pump set in the fire pump room, and the other end is connected to a water intake port located near the bottom of the water intake device; the water intake port is a cone-shaped structure with a larger diameter lower end fixed in the air near the bottom of the water intake device by a bracket. This utility model solves the problem of the inability to clean the grid at the head of the water intake and realizes early warning of insufficient water supply during the dry season.

The invention relates to the field of flame-retardant materials, in particular to high-flame-retardance epoxy resin and a preparation method thereof. The preparation raw materials of the high-flame-retardancy epoxy resin comprise a material A and a material B, the material A comprises the following raw materials in parts by mass: 100 parts of flame-retardant epoxy resin, 1-2 parts of a dispersing agent and 60-100 parts of an inorganic flame retardant; and the material B comprises the following raw materials in parts by mass: 60-100 parts of a curing agent, 0.1-0.3 part of a catalyst and 60-100 parts of an inorganic flame retardant. Through the synergistic flame-retardant design of the flame retardant and the flame-retardant filler, the problem of poor flame-retardant durability caused by purely adding the flame retardant or using the common filler is effectively solved, the prepared epoxy resin shows excellent flame-retardant property in a UL94 vertical combustion test, and meanwhile, the flame-retardant property of the epoxy resin is improved by reasonably adjusting the proportion of the flame retardant. On the premise of ensuring high flame retardance, the mechanical properties of impact, stretching, bending, compression and the like of the material are considered, and various mechanical indexes are stable and meet the use requirements of the ignition coil.

This utility model discloses an atomizer and an electronic cigarette using the same. The atomizer includes an oil storage body and an atomizing body. The oil storage body has an oil storage chamber and a receiving chamber that are isolated from each other. The atomizing body is located in the receiving chamber. An oil guide hole is provided on the corresponding chamber wall of the receiving chamber for guiding the e-liquid from the oil storage chamber into the receiving chamber. The atomizing body has an atomizing channel, within which are arranged an electric heating element, an oil-absorbing element wrapped around the electric heating element, and an oil guide element made of a material with good adsorption and permeability wrapped around the oil-absorbing element. An oil inlet hole corresponding to the oil guide element is provided on the atomizing body. This utility model, by adopting the above technical solution, solves the problem that existing electronic cigarette atomizers have multiple layers of oil-absorbing elements wrapped around the electric heating element. This not only increases the cost of several layers of oil-absorbing elements but also slows down the oil absorption speed. Furthermore, impurities mixed in the e-liquid can deposit on the outer layer of the oil-absorbing element, preventing e-liquid from entering the inner layer and causing the oil-absorbing element to burn.

The present application provides a power transmission device capable of supplying sufficient oil to a driven-side clutch plate mounted to a pressure member. The power transmission device includes a clutch member coupled to an output shaft (3) capable of rotating a wheel of a vehicle; and a pressure member (5) capable of moving between an operating position and a non-operating position, the operating position being a position in which a driving-side clutch plate and the driven-side clutch plate are in pressure contact to become a state in which driving force of an engine can be transmitted to the wheel, and the non-operating position being a position in which pressure contact force of the driving-side clutch plate and the driven-side clutch plate is released to become a position in which transmission of the driving force of the engine to the wheel is cut off. The driven-side clutch plate (7a, 7b) is mounted to the second clutch member (4b) and the pressure member (5), and the pressure member (5) is formed with an oil flow passage capable of causing oil to flow toward the driven-side clutch plate (7b) mounted to the pressure member (5).