235results about How to "Reduce churn rate" patented technology

This invention relates a series of steps to provide an economical production of a carbon based fertilizer and soil amendment made during the capture of greenhouse gases from the combustion of fossil and non fossil fuels. The invention uses biomass and other carbonaceous sources through pyrolytic conversion to gases and charcoal, to allow for the further production of co-products, such as hydrogen and ammonia. The invention also relates to the combination of hydrated ammonia, combustion flue gas exhaust, and charcoal, provide for the conversion of the charcoal into a valued added soil amendment to return essential trace minerals and plant nutrients to the soil. The ability to produce a large volume carbon co-product while removing mandated emissions and producing renewable based hydrogen provides an economic gain to a large number small and large businesses and increase the chance of achieving significant reductions in greenhouse gas emissions.

The present invention discloses one kind of hydrodemetalizing catalyst and its preparation process. The catalyst has alumina containing P, Mg and K as carrier, VIII and VIB metal element as the active component and optional auxiliary components. It is prepared through a simple preparation process. The catalyst is especially suitable for the hydrodemetalizing process of hydrocarbon with high oxygen content, high metal content and high easy-to-coke component content, such as light coal tar oil fraction, and has the features of high hydrodemetalizing activity, high stability and long service life.

The invention relates to an organic composite high-temperature proton exchange membrane and a preparation method of the membrane. Particularly, the organic composite high-temperature proton exchange membrane is formed by compositing a polybenzimidazole compound A and a strong-base polymer B as raw materials at a mole ratio of 1:(0.01-99.99). The invention further provides the preparation method of the high-temperature proton exchange membrane. The high-temperature proton exchange membrane has high proton conductivity and high mechanical strength and is very suitable for a proton exchange membrane fuel cell.

The invention relates to the field of fertilizer and discloses a high-efficiency film-coated controlled release urea which has the structure comprising an internal layer, an intermediate layer and an external layer, wherein, the internal layer is urea, the intermediate layer is inorganic cladding material and the external layer is organic matter coating material; the weight ratio of the urea, the inorganic cladding material and the organic matter coating material is 1:(0.2-1): (0.02-0.2). The high-efficiency film-coated controlled release urea has stable nitrogen release speed and reduced nitrogen loss speed, so as to not only greatly improve the utilization rate of fertilizer, but also relieve or eliminate the fertilizer pollution, thus being an environment-friendly slow release fertilizer. The invention also discloses a method for preparing the high-efficiency film-coated controlled release urea.

The invention relates to a liquid crystal display and a control method thereof. The liquid crystal display comprises a colour filter panel and an array panel, wherein a storage capacitance electrode wire and a gate line which is connected with a scan drive circuit are formed on the array panel; a common electrode is formed on the colour filter panel or the array panel; and the storage capacitance electrode wire is connected with a control circuit which is used for controlling the electric potential of a storage capacitance electrode. When the scan drive circuit applies a square row scanning signal to the gate line and a scanning signal rising edge approaches, the control circuit applies a first voltage to the storage capacitance electrode wire according to a control voltage; and when a row scanning signal falling edge approaches, the control circuit applies a second voltage to the storage capacitance electrode wire according to the control voltage, wherein the first voltage is less than the second voltage. The control method of the invention is applied to the manufacturing of liquid crystal displays.

A method for preparing coconut shell activated carbon with a silver controlled-release sterilizing function through hydrothermal reaction is characterized in that: using coconut shell activated carbon as a raw material and silver nitrate as an impregnating liquid, preparing silver-carried activated carbon through hydrothermal reaction, and forging at a high temperature under nitrogen protecting conditions to obtain the product. The operating technology has the main characteristics that the coconut shell activated carbon is used as the raw material, the absorption capacity is high, the speed is high, and the product is durable and regenerative; silver is more effectively loaded on the activated carbon through hydrothermal reaction preparation, and high specific surface area (1000m<2> / g) and high antibacterial activity (the sterilizing time of 107 / mL is 35 minutes) are obtained; high-temperature forging is favorable to the reactivation of the silver-carried activated carbon, silver granules are more uniformly distributed on the surface of the activated carbon, and a silver controlled-release function is realized.

The invention relates to an iron tailing soil improvement agent and an iron tailing soil improvement method. The iron tailing soil improvement agent comprises biochar, rice husks, ceramsite, organic fertilizers, attapulgite powder and planting soil. A mass ratio of the biochar to the rice husks to the ceramsite to the organic fertilizers to the attapulgite powder to the planting soil is (0.5-3):(0.2-1):(0.5-1.5):(1-4):(1-2.5):(1.0-2.2). The iron tailing soil improvement agent and the iron tailing soil improvement method have the advantages that the particle size of soil can be improved by theaid of the iron tailing soil improvement agent, the loss rate of water in the soil can be eased, the water retention capacity can be enhanced, organic matters can be quickly and effectively supplemented, the content of organic matters in tailing can be effectively increased, and suitable environments can be provided for plant growth; the rice husks and the ceramsite are matched with one another, the porosity of iron tailing soil can be improved, the hardening degree of the soil can be lowered, the tailing soil can keep in excellent gas-permeable and soft states for a long term, accordingly, the iron tailing soil improvement agent and the iron tailing soil improvement method are favorable for respiration of animals and plants in the soil, and the survival rate can be increased.

The invention discloses an organic-inorganic compound fertilizer special for green and high-yield lotus roots. The organic-inorganic compound fertilizer is prepared from, by weight, 10-40 parts of compound urea, 15-35 parts of humic acid, 20-45 parts of monoammonium phosphate, 5-15 parts of monopotassium phosphate, 20-40 parts of calcium magnesium phosphate fertilizer, 40-60 parts of bagasse, 50-80 parts of thoroughly decomposed chicken manure, 40-65 parts of molasses powder, 5-15 parts of cassava alcoholic fermentation liquor, 0.5-1.8 parts of calcium hydrophosphate, 0.5-1.8 parts of diethyl aminoethyl hexanoate, 0.5-1.8 parts of EDTA chelated zinc, 0.5-1.8 parts of diaminoferric xanthohumate, 0.2-0.9 part of sodium selenite, 0.05-0.09 part of EDTA chelated manganese and 1-3.5 parts of biological source pesticide. By means of the organic-inorganic compound fertilizer, pesticide residues in rice can be reduced, the environment is not polluted, the soil structure can be improved, the slow release effect is good, nutrient elements needed by the whole growing period of the lotus roots can be provided, and the yield of the lotus roots is high.

The invention discloses slow-release and high-yield fertilizer special for cucumbers. The slow-release and high-yield fertilizer is prepared from, by weight, 20-40 parts of composite film-coated urea, 5-15 parts of ammonium nitrate, 20-40 parts of monoammonium phosphate, 40-80 parts of potassium sulphate, 5-15 parts of potassium chloride, 1-2 parts of calcium hydrophosphate, 0.1-0.5 part of sodium silicate, 0.1-0.5 part of EDTA chelated zinc, 0.2-0.6 part of diaminoferric xanthohumate, 0.1-0.4 part of EDTA chelated zinc, 40-80 parts of composted chicken manure, 20-40 parts of molasses powder, 20-40 parts of grass carbon, 5-15 parts of decomposed coal, 5-15 parts of kaolin, 0.001-0.007 part of bacillus subtilis, 0.02-0.05 part of bacillus licheniformis and 0.005-0.009 part of paenibacillus polymyxa. By means of the slow-release and high-yield fertilizer, no topdressing needs to be conducted after one-time fertilization, the fertilizer efficiency is remarkable and durable, the slow release effect is good, the soil structure can be improved, nutrient elements required for growth of cucumbers are provided, and yield of cucumbers is high.

The invention discloses a special environment-friendly fertilizer for high yield of lotus roots. The fertilizer comprises raw materials in parts by weight as follows: 30-60 parts of composite urea, 20-40 parts of ammonium nitrate, 15-30 parts of a calcium, magnesium and phosphate fertilizer, 20-40 parts of monopotassium phosphate, 10-18 parts of potassium chloride, 10-30 parts of potassium citrate, 10-40 parts of composted chicken manure, 10-30 parts of bagasse, 20-60 parts of tapioca flour, 1-2 parts of calcium hydrophosphate, 0.2-0.6 parts of sodium silicate, 0.01-0.09 parts of EDTA (ethylene diamine tetraacetic acid) chelating manganese, 0.1-0.22 parts of EDTA chelating iron, 0.1-0.8 parts of borax, 0.1-0.45 parts of fermented composite bacteria and 5-10 parts of a biological pesticide. The fertilizer has a good slow-release effect and remarkable fertilizer efficiency, can improve the structure of soil and causes no pollution to the environment, and the yield of the lotus roots is high.

The invention discloses a business processing method and device. The method comprises the following steps: obtaining target event information and predicting a target business change amount corresponding to the target event information according to the target event information and pre-stored history event information; searching a target base station with association relationship with the target event information and obtaining a normal available capacity of the target base station; computing an adjustment configuration parameter according to the target business change amount and the normal available capacity of the target base station and adjusting the available capacity of the base station according to the adjustment configuration parameter before the target event happens. According to the business processing method and device provided by the invention, the network problems caused by the bump up of the business amount can be avoided.

The invention relates to a catalyst for low-water ratio ethylbenzene dehydrogenation, which mainly solves the problem that in the prior art, low-potassium catalyst has poor stability under the condition of low-water ratio. The invention adopts the technical scheme that ferrate is added into a ferrum-potassium-cerium-tungsten-magnesium catalytic system, so that the problem is well solved. The catalyst can be applied in industrial production of styrene prepared through ethylbenzene dehydrogenation under the condition of low-water ratio.

A regeneration method of a noble metal catalyst. The invention discloses a regeneration method of a low-carbon alkane dehydrogenation catalyst, by which a deactivated noble metal-based low-carbon alkane dehydrogenation catalyst recovers an excellent catalytic performance. The method includes the following steps: (1) under hydrogen atmosphere, treating the deactivated catalyst in a hydrogen donor solvent; and (2) treating the treated deactivated catalyst in the step (1) in a mixed atmosphere containing CO2 and N2O to obtain regenerated catalyst. The regeneration method of the low-carbon alkane dehydrogenation catalyst can allow the dehydrogenation activity of the regenerated catalyst to reach the level of a fresh catalyst. The regeneration method is simple in processes and is easy to carry out.

The invention discloses water-retaining slow-release fertilizer special for Chinese cabbages. The water-retaining slow-release fertilizer is prepared from rapeseed dregs, carbonized straw, peat, duck dung, pleurotus ostreatus residues , urea, diammonium phosphate, calcium superphosphate, potassium sulfate, potassium chloride, potassium nitrate, polyurethane, magnesium hydroxide, quicklime, trace elements, a water-retaining slow-release agent, bacillus subtilis, bacillus licheniformis, yttrium nitrate, rotenone, nano-tea polyphenols, nano-hydroquinone and citric acid. The water-retaining slow-release fertilizer special for the Chinese cabbages is reasonable in formula and good in water-retaining and slow-release effects, the growth of the Chinese cabbages can be promoted, and the quality of the Chinese cabbages is improved.

The invention provides a payment service processing method and system, and relates to the technical field of data services. The payment service processing system comprises a detection and reminding module for generating a reminding notice when the balance of a customer communication account is detected to be lower than a preset value, and a calling and payment module for initiating a payment voice call to a customer according to the reminding notice and guiding the customer to finish payment operation via voice. According to the scheme provided by the invention, the system automatically triggers the initiation of the voice call to a mobile phone number of the customer when the customer communication account is out of service or almost out of service, and customer capital deduction and communication account payment are finished in a single call, so that the defect of failure in realizing effective communication between the system and the customer when the communication account of the customer in a current system is out of service is overcome; the out-of-service duration of the customer is effectively shortened; a convenient, effective and rapid payment way is provided for the customer; the customer satisfaction can be greatly improved; and the customer off-network rate is reduced.

The invention discloses a regeneration method of a precious metal dehydrogenation catalyst. The regeneration method mainly solves the problems that in the regeneration process of a light-alkane dehydrogenation catalyst, reactive metal accumulates and alkali metal is lost. The method comprises the following steps that 1, in hydrogen atmosphere, hydrogen supply solvent is used for treating a deactivated catalyst; 2, the deactivated catalyst treated in the step 1 is subjected to charking in mixed atmosphere containing low-concentration oxygen; 3, the deactivated catalyst treated in the step 2 is subjected to alkali metal additive supplementing treatment, and then roasted in air to obtain the regenerated catalyst. According to the regeneration method of the precious metal dehydrogenation catalyst, dehydrogenation activity of the regenerated catalyst can reach the level of a fresh catalyst, meanwhile, in the regeneration process, temperature changes little, operation is easy, and the service life of the catalyst is prolonged.

The invention discloses a porous material composite fruit wax-coating preservative capable of controlling breath, and solves the problems that fruits are rotted and deteriorated easily to produce alcohol, can be kept fresh difficultly and cannot be stored. The composite preservative consists of the following components in percentage by mass of 5 to 9.8 percent of shell-lac, 0.05 to 3 percent of porous material (comprising three-dimensional network porous silicon oxide, kieselguhr, porous ceramic and porous carbon), 0.04 to 3 percent of cosolvent, 0.05 to 0.3 percent of bacteriacide, 0.01 to 0.1 percent of dispersing agent and the balance being water. Mangos and pineapples which are coated with the preservative can still taste fresh after being stored for 30 days, so that the weight loss rate is reduced twice, and the rotting rate is less than 5 percent; and the quality of fruits is guaranteed, the storage period and the shelf life of the fruits are prolonged, and economic loss caused by rotting and deterioration of the fruits and the like is reduced effectively.

The invention relates to a large-scale preparation method of scale I-type collagen peptide applicable to cosmetics. The scales of marine fish or part of freshwater fish are adopted as a raw material; in pretreatment, an alkaline solution is adopted for fast degreasing, and an acid solution is adopted for fast decalcification; after that, a scale I-type collagen peptide solid obtained by the pretreatment is directly prepared into an I-type collagen peptide concentrated solution by a biological enzymolysis technology, and the extraction rate is higher than or equal to 97%; enzymatic hydrolysate is separated, purified and desalted at normal temperature by a continuous flow centrifugation collaborated membrane separation technology to obtain scale I-type collagen peptide liquid with the content of higher than or equal to 95%; finally, the scale I-type collagen peptide liquid is quickly dried by a spray drying technology to obtain scale I-type collagen peptide microspheres with a special hollow structure, and the scale I-type collagen peptide microspheres are quickly sterilized by an optical radiation technology, and are sealed and stored. According to the method provided by the invention, I-type collagen in the scales is almost completely turned into the I-type collagen peptide concentrated solution; the prepared scale I-type collagen peptide is of a microsphere shape, and the particle size is uniform and is mainly on a micron level of 1-10mu m.

The invention discloses a preservation method for fresh fruits. The preservation method comprises the following steps: firstly, screening fruits; selecting fresh fruits with uniform size, no plant diseases and insect pests and no mechanical loss; soaking the screened fresh fruits by using a 0.5%-2.0%w / v potassium sorbate solution for 25-35 minutes, and then airing by cold air; then suffocating by using a 0.5ul / L-2.0ul / L 1-methylcyclopropene suffocating agent for 11-13 hours under room temperature; after suffocating, soaking by using aloe barbadensis mill gel raw juice for 25-35 minutes; and airing and preserving. According to the preservation method, three reagents are mutually matched so that the guarantee period of the fresh fruits can be effectively prolonged and the special flavor of chilies is kept; under the same preservation condition, the corruption degree of the fruits can be delayed and the respiration intensity of the fruits is effectively reduced, so that the draining speed of the content of vitamin C, chlorophyll and superoxide dismutase is reduced, and furthermore, the fruits are easy to preserve.

The invention provides an auxiliary prolonging a lasting period of plant foliar fertilizer and a preparation method thereof. The chemical fertilizer auxiliary is composed of the following ingredients in parts by weight: 2-4 parts of straw, 1-2 parts of fly ash, 1-3 parts of attapulgite, 1-2 parts of lignin, 5-10 parts of sodium metaphosphate, 1-3 parts of biochemical potassium fulvate, 2-10 parts of sodium pyrophosphate, 5-30 parts of aminopropyl triethoxy silane and 0.6-1 part of a photosynthesis accelerator. The invention also provides a preparation method of the auxiliary. The auxiliary provided by the invention can improve adhesive capability of the foliar fertilizer on plant leaf surfaces and also can promote photosynthesis of the plant leaf surfaces and shorten a plant growth cycle, and drift, leaching loss and volatilization loss are reduced, so that the aims of prolonging the lasting period and improving nutrient utilization rate are achieved; the main raw materials of the auxiliary provided by the invention are natural and environment-friendly, so that no secondary pollution can be introduced; meanwhile, fertilization dosage and frequency are reduced, labour and cost are saved, and environmental pollution is reduced.

The invention discloses a soil repairing agent for heavy metal element contaminated soil and a preparation method of the soil repairing agent. The soil repairing agent comprises the following components: calcium silicate, lime, calcium phosphate, sulfur, an organic fertilizer and modified acrylic fibers. The preparation method of the soil repairing agent comprises the following steps: preparing the organic fertilizer; preparing the modified acrylic fibers; and uniformly mixing the calcium silicate, the lime, the calcium phosphate, the sulfur, the organic fertilizer and the modified acrylic fibers to obtain the soil repairing agent. The calcium silicate, the lime, the calcium phosphate, the sulfur, the organic fertilizer and the modified acrylic fiber in the soil repairing agent act together to provide nutrient elements for growth and development of crops, heavy metal ions in soil are fixed, the content and activity of the heavy metal ions in the soil are reduced, and heavy metal adsorption by crops is inhibited, so that the purpose of treating heavy metal ion pollution in the soil is achieved. The experimental structure shows that the soil repairing agent prepared by the method hasa good treatment and repairing effect on the heavy metal contaminated soil.

The invention discloses a prawn-flavor seasoning and a processing technology thereof. The processing technology of the prawn-flavor seasoning comprises the following steps: 1) carrying out preprocessing; 2) carrying out enzymatic hydrolysis; 3) carrying out thermal reaction; 4) carrying out fermentation; 5) carrying out flavoring; 6) carrying out spray-drying; and 7) carrying out packaging. The processing technology has the following beneficial effects: the enzymatic hydrolysis is fully performed so that macromolecular proteins of the prawns are decomposed into small-molecular proteins or amino acids which are easy for the human body to absorb, and loss of other nutrients in the prawn body, such as vitamins and minerals, is few so that the prepared prawn-flavor seasoning is high in nutritional values; Maillard reaction is carried out so as to greatly improve palatable taste of the prawns; moreover, additives are added so as to promote the Maillard reaction, and thus, the palatable taste is locked while loss rate of the palatable taste is greatly slowed down. The prawn-flavor seasoning prepared according to the processing technology is mellow in fresh prawn flavor, rich in nutrients, small in molecular weight, as well as soft, fine and smooth in taste; moreover, the prawn-flavor seasoning has the flavor of lactic acid and fresh prawn, and is unique in taste, mellow in flavor and long-lasting in aftertaste.

The invention discloses a DFN packaged digital infrared temperature sensor. The sensor comprises a DFN packaging shell with a window in the top, a thermopile, a TC template and an ASIC module are arranged in the DFN packaging shell, an infrared optical filter is arranged at the window of the DFN packaging shell, and a closed space is defined by the infrared optical filter and the DFN packaging shell; the DFN packaging shell is provided with an air guide hole and an exhaust hole, the bottom of the DFN packaging shell is provided with a pin, and the inner wall of the DFN packaging shell is provided with a metal shielding layer and a SiO2 film. The DFN packaged digital infrared temperature sensor has the advantages of miniaturization, low cost, high electromagnetic shielding efficiency, highmeasurement precision, high readability, simple forming process, suitability for large-scale production and wide application.

The invention discloses a plantation method of a high-yield cucumber. The method comprises the following steps: after final signaling of cucumber seedlings, applying a cucumber special-purpose fertilizer, drawing strings to put up a shelter, performing intertillage weeding, when cucumber tendrils grow to somewhere close to the top of the shelter, carrying out tendril falling, and stopping watering three to five days before the tendrils fall, wherein raw materials of the cucumber special-purpose fertilizer comprise composite coating urea, mono-Ammonium phosphate, diammonium phosphate, potassium sulfate, potassium dihydrogen phosphate, calcium hydrogen phosphate, sodium silicate, EDTA Chelating zinc, ammonium ferrous sulfate, EDTA Chelating zinc, rotted chicken manure, molasses powder, peat, weathered coal, kaolin, Bacillus megaterium, Pseudomonas fluorescens and Paenibacillus polymyxa; and cleaning stems and the tendrils, picking cirrus, for cucumbers grown from side tendrils, when the cucumber tendrils grow to 5 to 15cm, pinching main tendrils, reserving two to five lateral branches, and plucking the cucumbers when the cucumbers are ripe. According to the method provided by the invention, the slow release effect is good, the soil structure can be improved, nutrients are abundant, the cucumber output is high, the plantation method is simple, and the cost is low.

The invention discloses a stamped part stamping device and stamping method. The stamped part stamping device comprises a stamping mechanism, and further comprises a feeding mechanism and a clamping mechanism. The stamping mechanism comprises a base box. The top of the base box is fixedly provided with an inverted-L-shaped supporting plate and a static die holder. A first hydraulic cylinder is mounted on the top of the inverted-L-shaped supporting plate in a penetration mode. The movable end of the first hydraulic cylinder is fixedly connected with a mounting plate. Through cooperative use of the feeding mechanism, a rotation motor, a feed conveying device, a limiting sliding rod, second electric telescopic rods, a vacuum device, a driving plate, a threaded rod, a second movable plate, first cylinders, vacuum cups, mounting racks, a connecting hose and a T-shaped tube, the stamping device can realize automatic feeding, greatly reduces the stamping operation difficulty, facilitates stamping operation, meanwhile, is beneficial to improving the working efficiency, avoids hidden danger caused by manual feeding and has high safety performance.

The invention relates to the technical field of agricultural machines, and discloses a rotary cultivator used for large-scale cultivation. The rotary cultivator comprises a fixed frame, fixed blocks are fixedly installed on one side of the top end of the fixed frame, a first rotary shaft is movably sleeved with the tops of the first fixed blocks, a first gear fixedly sleeves the middle of the outer side of the first rotary shaft, a second gear is fixedly installed at one end of the first rotary shaft, a second fixed block is fixedly installed in the middle of the front face of the fixed frame,a second rotary shaft is movably sleeved with the top of the second fixed block, and an end face gear is fixedly installed on the back face of the second rotary shaft. According to the rotary cultivator used for large-scale cultivation, drive gears, first driving gears and second driving gears are installed on the two sides of the fixed frame respectively, accordingly, power of the rotary cultivator is transmitted and moved to the two sides of the fixed frame, the two ends of a third rotary shaft and the two ends of a fourth rotary shaft are stressed more evenly, the loss of a single drive set is reduced, and cultivation blind regions of the rotary cultivator are effectively reduced.

The invention relates to a method for making citrus grandis tea. The citrus grandis tea mainly consists of citrus grandis fruits, citrus grandis flowers, purple perilla and mint. According to the method for making the citrus grandis tea, the citrus grandis flowers are added to the citrus grandis fruits, so that the fragrance of the citrus grandis flowers is added, and the fragrance of the citrus grandis tea can be increased; the citrus grandis fruits are made into a citrus grandis tea bag, so that running-off speed of beneficial components of naringin and the like in the citrus grandis fruits can be effectively reduced, and the quality guarantee period of the citrus grandis tea is prolonged; firstly, the purple perilla is baked in an oven with appropriate temperature, then the baked purple perilla is stuffed into the shells of the citrus grandis fruits, so that redundant water in citrus grandis leaves can be removed, besides, absorption of beneficial substances of naringin, citral, geraniol and the like by the perilla leaves can be facilitated, and running off of beneficial components of naringin and the like in the citrus grandis fruits can be reduced; firstly, the mint is exposed to the scorching sun for dehydration, and then the dehydrated mint is stuffed into the shells of the citrus grandis fruits, so that mint fermentation and deterioration can be avoided; and besides, the mint is cool in nature, so that the problem that hot qi is generated in bodies after too much citrus grandis tea is drunk can be effectively solved.

The invention discloses a single-machine double-temperature-area heat-pump water heater. The single-machine double-temperature-area heat-pump water heater comprises a waste heat recovery system, a water circulation system, a heat pump circulation system and a heat exchange system, wherein the heat exchange system realizes heat exchange of the waste heat recovery system, the water circulation system and the heat pump circulation system. According to the single-machine double-temperature-area and heat-pump water heater, through the combination of waste heat recovery, single-machine and double-control and double-temperature-area water storage, the energy loss is reduced to the maximum extent, the ultrahigh energy efficiency ratio is effectively realized, meanwhile, the requirement for a refrigerant is low, the universality is high, the manufacturing cost and the operation and maintenance cost are low, the service life is long, the requirement for using environment is low, and the application range is wide.

A catalyst for preparing low-carbon olefin by catalytic cracking is prepared from alumina, magnesium oxide, sodium vanadate, calcium carbonate, RE metal oxide, kaliophilite or potash feldspar, Cr2O3 and MnO2. Its advantages are high catalytic activity and selectivity, long service life and low reaction temp.

The invention discloses a novel heat pump system for heating ventilation air conditioning engineering, and relates to the technical field of heat pump systems. The novel heat pump system comprises a water storage tank. An electric heating boiler is fixedly connected to the end, away from the water storage tank, of a heating through pipe, and the output end of the electric heating boiler is fixedlyconnected with a hot water inlet pipe. A cold water inlet pipe is connected with a temperature-controlled water collector through a first control valve, and the output end of a heating chamber communicates with a temperature-controlled water separator through a water outlet main valve pipe. The output end of the temperature-controlled water separator is separately and fixedly connected with a thermal cycle return pipe and a cold cycle return pipe, and a third control valve and a fourth control valve are correspondingly arranged at positions, close to the temperature-controlled water separator, of the thermal cycle return pipe and the cold cycle return pipe. The novel heat pump system for the heating ventilation air conditioning engineering achieves the purposes of the improvement of the cyclic utilization rate of a heating water source, the reduction of the heating heat loss rate, the improvement of a heating effect, the timely detection of fault conditions of system internal circulation and the improvement of safety of the heat pump system.