8results about How to "Avoid rapid accumulation" patented technology

The invention belongs to the technical field of casting, and provides an investment casting process of a martensitic stainless steel material part, according to the investment casting process of the martensitic stainless steel material part, through introduction of silicon carbide and metamorphism of a rare earth ferrosilicon alloy, the thermal expansion coefficient of steel is reduced, and the performance of the martensitic stainless steel part is improved. And meanwhile, structure grains in the martensitic stainless steel solidification process are remarkably refined, formation of thick and large matrix structures is reduced, and therefore internal stress generated in the casting solidification stage is reduced. And meanwhile, the plasticity and toughness of the material can be improved through the refined crystal grains, the adaptive capacity of the casting to martensite transformation volume change in the subsequent heat treatment process is enhanced, accumulation of internal stress is relieved, and finally cracks are effectively restrained. Compared with existing schemes such as casting temperature optimization and shell deformability adjustment, the process improves the material performance from the structure level through modification treatment, the anti-cracking capacity of the casting can be fundamentally improved, meanwhile, the size precision and the mechanical property of the casting are considered, and the bottleneck of the prior art is broken through.

The application discloses a preparation method of hydrogenated aldehyde ketone resin without free formaldehyde, belongs to the technical field of aldehyde ketone resin synthesis, and aims to solve the technical problems of high free formaldehyde content, and further improved hydroxyl value stability and transparency in the hydrogenated aldehyde ketone resin in the prior art, and specifically comprises the following steps: under the protection of an inert gas atmosphere, phenylacetone, polyformaldehyde and a solvent are mixed and stirred, the reaction system is heated to 60-75 DEG C, and an inorganic alkali is added into the reaction system. The application is characterized in that the basic aldehyde ketone resin solution prepared by condensation of polyformaldehyde and phenylacetone in a water-free environment with a nickel catalyst is catalytically hydrogenated, not only the hydrogenated aldehyde ketone resin with stable hydroxyl value and extremely low colority is effectively obtained, but also the free formaldehyde content in the hydrogenated aldehyde ketone resin is effectively reduced, and the wide applicability of the hydrogenated aldehyde ketone resin in high-end coatings, adhesives and electronic materials is improved.

This invention belongs to the field of dairy goat feed technology, specifically relating to a total mixed ration (TMR) for dairy goats containing fresh oat hay, its preparation method, and its application. The invention involves chopping fresh oat hay, sequentially spraying it with a functional oil-based compound emulsion and an organic acid salt compound preservative solution, followed by static adsorption and mixing treatment, and then gradient mixing with dry-based raw materials to obtain the TMR. This invention is the first to achieve the direct use of high-moisture fresh oat hay in TMR without fermentation. It utilizes the cell wall fiber network of fresh oat hay as a natural carrier for functional oils, allowing the oils to penetrate into the fiber pores through static adsorption, forming a stable physical encapsulation structure and effectively reducing the rumen hydrogenation rate of polyunsaturated fatty acids. The invention employs a low-starch, high-slow-release fiber gradient energy supply design, combined with the organic acid salt compound preservative solution, to achieve synergistic effects in feed preservation, oil protection, and rumen health regulation.

The invention discloses a construction method and device of a normal temperature-medium temperature efficient two-phase anaerobic digestion system. The construction method comprises construction of a normal temperature acidogenic phase anaerobic system and construction of a medium temperature methanogenic phase anaerobic system. The construction of the normal-temperature acidogenic phase anaerobic system comprises an initial stage, a transition stage and an enrichment stage 1; the medium-temperature methanogenesis phase anaerobic system is constructed by gradually increasing the concentration of inlet water ammonia nitrogen in the medium-temperature anaerobic methanogenesis system, and comprises a starting stage and an enrichment stage 2; the normal-temperature acidogenic phase anaerobic system constructed by the invention obviously reduces the operation cost, avoids secondary pollution to the environment, and effectively reduces the accumulation of volatile acids such as propionic acid and butyric acid; a medium-temperature methanogenesis phase anaerobic system has certain tolerance to high ammonia stress and high organic load rate, so that the tolerance of the methanogenesis phase system to high organic coincidence rate and high ammonia stress is enhanced; the constructed normal-temperature-medium-temperature high-efficiency two-phase anaerobic system has the advantages of saving energy, relieving accumulation of volatile acid, resisting high ammonia and high organic load and the like.

The application relates to the technical field of bolt loosening monitoring, and discloses a wide-range high-temperature-resistant piezoresistive sensor and a preparation method and application thereof. The piezoresistive sensor comprises a sensing layer and an FPC board, wherein the sensing layer comprises a polyimide matrix and conductive fillers, nano-aluminum oxide and nano-clay dispersed in the polyimide matrix. The application can improve the dispersion uniformity of the nano-clay and nano-aluminum oxide in the polyimide matrix, and can form some shallow energy level traps in the polyimide matrix to replace the original trap positions, so as to adjust the electron transmission path and relieve the space charge accumulation, thereby reducing the microstructure damage caused by high temperature, enhancing the thermal stability of the sensing layer material, and maximizing the high-temperature-resistant performance of the piezoresistive sensor. The piezoresistive sensor of the application can reach a range of 30 MPa and can resist a temperature of more than 300 DEG C in a high-temperature environment for bolt loosening monitoring.

The present application relates to the technical field of seawater desalination material preparation, and particularly relates to a double-network hydrogel evaporator for interfacial water evaporation, a preparation method and application, comprising a polyvinyl alcohol first network and a 2-acrylamide-2-methylpropanesulfonic acid second network which penetrate each other, and Ti4O7 photo-thermal absorption material is dispersed in the first network; the evaporator has a macroporous skeleton formed by the first network and a multistage pore composed of nanoscale fibrous and membranous secondary structures derived from the second network on the macroporous skeleton, the mechanical stability is improved through a double-network synergistic enhancement mechanism, the multistage pore structure is used to accelerate water transmission and increase the evaporation interface, so that the evaporator has a high evaporation rate, excellent salt resistance and long-term operation stability, and is more suitable for solar-driven seawater desalination, and solves the problems of weak mechanical strength, poor structural stability and poor environmental adaptability of the hydrogel-based evaporator in the prior art.

This invention discloses a method for enhancing electron transfer in a longitudinal phase-separation anaerobic reactor. This method achieves efficient degradation of various recalcitrant organic wastewaters and efficient biogas recovery in the anaerobic reactor. By longitudinally partitioning the reactor, relative phase separation of the acid-producing and methanogenic stages is achieved. Precise addition of acid-producing and methanogenic phase media materials through phase separation enhances the electron transfer process in the anaerobic treatment, resulting in a faster electron transfer rate, improved stability and pollutant treatment efficiency, shorter reactor start-up time, smaller footprint, easier control, lower cumulative effects of intermediate products such as VFAs, and higher treatment efficiency and energy recovery rate.

The application discloses a method for improving gas production performance of straw and pig manure mixture dry biogas fermentation based on multi-factor cooperation, which comprises the following steps: mixing pig manure and straw at a ratio of 1:1 as the best feed substrate according to total solids, adopting semi-continuous dry biogas fermentation process, feeding the substrate into a biogas fermentation reactor, inoculating anaerobic sludge domesticated by pig manure, controlling the total solid concentration of the feed substrate to be 20%-30%, controlling the hydraulic retention time to be 25-45 days, feeding air into the fermentation process for air stirring, controlling the stirring intensity to be 33.3-66.7 mL / (L.min), and stirring once a day for 1 minute each time. The straw and pig manure mixture dry biogas fermentation gas production performance can be effectively improved through the synergistic effect of the optimized raw material ratio, the total solid concentration of the feed, the hydraulic retention time and the air stirring intensity.