31results about How to "Overcome the shortcoming of short life" patented technology

The invention relates to a method for preparing polyformaldehyde dimethyl ether by catalytic distillation. By the method, the problems of a low conversion rate of trioxymethylene and low selectivity of poly methoxyl dimethyl ether (DMM3-8) in the production of the polyformaldehyde dimethyl ether at present are mainly solved. In the method, methylal and the trioxymethylene are separated while reacting in a reaction distillation separation tower body, steam on a tower top is subjected to total reflux after being condensed, light components are extracted from a lateral line of a separation tower and return to the tower, a solution containing the polyformaldehyde dimethyl ether is extracted from a tower bottom, the trioxymethylene enters the reaction distillation separation tower body from the top of a reaction section, the methylal and the returned light components can enter the reaction distillation separation tower body from any position of the reaction section, and a reaction distillation separation tower comprises the reaction distillation separation tower body, a tower top condenser and a tower bottom reboiler. Through the technical scheme, the problems are better solved. The method can be used for the industrial production of the polyformaldehyde dimethyl ether.

The invention relates to the field of coal preparation and waste discharge, in particular to an intelligent dry waste discharge system based on true dual energy X-rays. The intelligent dry waste discharge system includes a feeding mechanism, a conveying mechanism, a recognition mechanism and a sorting mechanism. The feeding mechanism is composed of a feeding funnel and a spray desliming device, the outer part of the feeding funnel is in an inverted cone shape, and the inner part of the feeding funnel is laid with wear-resistant porcelain plates which can reduce the abrasion of funnel wall surfaces; the spray desliming device is composed of spray pipes and a high-frequency sifter; the conveying mechanism is composed of an electronic belt scale which can monitor the feeding quantity in realtime, an electromagnetic iron remover which can reduce the contamination of sundries, a belt cleaner which can clean fine materials, and a lining-up device capable of forming a plurality of regular coal flows; the recognition mechanism is composed of an X-ray generator generating the X-rays with different intensity, a detector receiving the X-rays, an imaging upper computer, a BP neural network, and a lead isolation room; and the sorting mechanism is composed of a positioning device, a manipulator, and a PLC control cabinet. According to the intelligent dry waste discharge system based on thetrue dual energy X-rays, adaptability to coal is strong, intelligent recognition is realized, therecognition accuracy is high, and at the same time, coal-dust pollution is reduced.

The invention relates to a preparation method for polyoxymethylene dimethyl ether, which mainly solves the problem that the trioxymethylene conversion rates and the selectivity of DMM3 to 8 are low in the production of polyoxymethylene dimethyl ether at present. Methylal and trioxymethylene are adopted to react under effective reaction conditions in a catalytic distillation tower, component separation is carried out during reaction, part of condensed overhead vapour flows back, the other part is recovered, the overhead reflux ratio is 1 to 10, distillate returns into the tower, part of bottom material is vaporized by a reboiler and then returns into the catalytic distillation tower, the rest is adopted as recovered liquid, wherein the methylal, the trioxymethylene and the returning distillate enter between the two reaction sections of the catalytic distillation tower, and the catalyst in the catalytic distillation tower is heterogeneous acidic catalyst. The technical scheme effectively solves the problem, and can be used in the industrial production of polyoxymethylene dimethyl ether.

The invention discloses a co-culturing method of human primary hepatocytes and liver nonparenchymal cells. The co-culturing method comprises following steps: fresh hepatic tissue is washed thoroughly with exposed blood vessel perfusate I and perfusate II until elasticity of the hepatic tissue is lost, and complete digestion is realized; the hepatic tissue is delivered into a culture dish filled with a cell washing liquor, and is screened so as to obtain a single-cell suspension; a culture plate or a culture dish coated with collagen is inoculated with the single-cell suspension with a low inoculum density so as to obtain monolayer co-cultured cells with a fusion degree of 100% in the presence of growth factors; and a maintaining culture medium containing 2% DMSO is added into the culture plate or the culture dish for culturing, and then a liver island structure is formed by accumulation of hepatic cells, wherein the liver island structure is surrounded and invaded by liver nonparenchymal cells. Routine hepatocyte separation technology is employed in the co-culturing method, in vitro long-term culturing of hepatocytes as long as 120 days are realized, and HBV susceptibility is maintained for as long as 72 days. In addition, the co-culturing method can be used for screening and evaluating anti-HBV medicines, and possesses significant importance on researches of antiviral medicines.

The invention relates to the technical field of building materials, and discloses a making method of thermal insulation decorative ceramic tiles. The making method comprises the following steps: placing ceramic plates on heat resistant plates; sequentially placing bonding layers and foaming ceramic powder on the ceramic plates; carrying out sinter molding and demoulding. According to the making method of the thermal insulation decorative ceramic tiles disclosed by the invention, the foaming ceramic powder and the ceramic plates served as decorative layers are subjected to high temperature sintering together and formed integrally to reduce the making procedures and the making cost.

An energy-saving water-based coating adsorbing and degrading formaldehyde and releasing negative oxygen ions is characterized in that the energy-saving water-based coating is prepared from, by weight, at least 15-30 parts of hydroxyl water-based resin, 40-100 parts of a first packing and 5-25 parts of a second packing, wherein the first packing is one or more of diatomite, coarse whiting and ash calcium, and the second packing is selected from montmorillonite and/or sericite. The energy-saving water-based coating has good breathability, water resistance, formaldehyde degradation performance and other excellent performance and can be used on the basic layers and face layers of building walls.

The invention discloses a self-adaptive parallel sealing and welding method for microelectronic packaging in a high vacuum state, and solves the problem of how to complete high-quality parallel seal welding of a cover plate and a tube shell of a thin-shell device at low cost in a vacuum environment so as to improve the sealing and welding yield. A floating parallel welding wheel support is arranged, two parallel welding wheels on the support are pressed on parallel welding seams between the cover plate and the tube shell in a floating mode, weights are arranged at the top end of the parallel welding wheel support, and the welding pressure of the parallel welding wheels on the welding seams is adjusted by increasing or reducing the number of the weights, so that the adjustment of the self-adaptive welding pressure in the welding process is realized; a shoulder-pole-shaped semi-square-shaped jacking frame body is arranged between the left parallel welding wheel support and the right parallel welding wheel support, the floating parallel welding wheel supports are lifted and lowered through jacking connection of eccentric wheels to the semi-square-shaped jacking frame body, and conversion between a welding state and a to-be-welded state of the two parallel welding wheels is completed. and the sealing and welding quality of the packaging assembly is greatly improved.

The invention discloses an optical crystal encoder of a simple structure. The optical crystal encoder of the simple structure comprises an encoder body and a grating device arranged inside the encoder body, and further comprises an optical crystal device. The optical crystal device comprises an optical crystal emitting device and an optical crystal receiving device. The optical crystal emitting device is arranged in a containing region of the encoder body and between the encoder body and the grating device. The optical crystal receiving device is arranged on the surface of the grating device and the encoder body, the grating device and the optical crystal device are fixed together through fixing devices. The optical crystal encoder of the simple structure overcomes the defects that a common mechanical encoder is short in service life, the service life of the mechanical encoder depends on the service life of a metal rotary disk and the universal mechanical encoder in the market can be used no more than 500 thousand times. However, the optical crystal encoder can be used infinitely theoretically.

The present invention is petroleum fraction alkyl sulfur transferring method. Heated petroleum fraction and alkylating agent are made to enter movable catalyst reactor, so that the sulfide in petroleum fraction and the alkylating agent produce alkylation reaction under the action of powdered alkylating catalyst. The reaction products are separated to obtain low-sulfur light petroleum fraction and high--sulfur heavy petroleum fraction, and the deactivated catalyst from the reactor is regenerated in regenerator and returned to the reactor for circular use. The said process can regenerate catalyst continuously or intermittently to maintain the catalytic activity of the alkylating catalyst for long period and has lowest loss of produce in amount and octane number while eliminating the thiofuran sulfur impurity in material.

The invention relates to the field of valves, in particular to a three-way valve. The three-way valve comprises a valve body, wherein a cavity, and a first channel, a second channel and a third channel which are respectively communicated with the cavity are formed in the valve body; a valve core is arranged in the cavity; the valve core consists of two trapezoid bodies which are arranged in a longitudinal symmetry manner and a cylinder which is sandwiched between the two trapezoid bodies; a sealing ring is arranged on the periphery of the cylinder; the first channel is selectively communicated with the second channel and the third channel by the matching of the valve core and the cavity; a push rod is arranged on the upper surface of the valve core, penetrates through the upper end of the valve body, and extends out of the valve body; clamping rods in the horizontal direction are arranged on the two sides of the push rod; a clamping seat corresponding to the clamping rods is arranged in the valve body. The defect that the service life of the valve core is short because the valve core of the original three-way valve is required to be rotated is overcome; the service life of the three-way valve is prolonged; the production cost is reduced.

The invention discloses a resin trapper for a nuclear power plant. The resin trapper comprises a bottom plate, a cylinder arranged on the bottom plate, a manhole cover plate assembled on the cylinder, a filter element mounting porous plate arranged in the cylinder, a filter element positioned in the cylinder by virtue of the filter element mounting porous plate, and a water inlet and a water outlet which are formed in the side wall of the cylinder, wherein the bottom plate, the cylinder, the manhole cover plate, the water inlet and the water outlet are manufactured by bimetallic composite steel plates; the inner layer refers to stainless steel plates; the outer layer refers to vessel steel plates; and the filter element mounting porous plate and the filter element are made of all stainless steel. According to the resin trapper for the nuclear power plant disclosed by the invention, the bimetallic composite steel plates are adopted, a layer of thin stainless steel plates is compounded on the inner side of an equipment container, the original rubber lined layer is replaced, and the defect that the rubber lined layer is short in service life is overcome. Compared with an all stainless steel material, the material in the invention has the advantages that the construction cost is greatly reduced, and the anticorrosion requirement is met. In the nuclear power plant operating process, the resin trapper for the nuclear power plant disclosed by the invention does not need to be maintained and replaced in the unit lifecycle under the normal use condition.

The invention discloses a self-adaptive parallel sealing and welding mechanism for microelectronic packaging in a high vacuum state, and solves the problem of how to complete high-quality parallel sealing and welding of a cover plate and a tube shell of a thin-shell device in a vacuum environment at low cost so as to improve the sealing and welding yield. The self-adaptive parallel sealing and welding mechanism is characterized in that a floating parallel welding wheel support is arranged, two parallel welding wheels on the support are pressed on parallel welding seams between a cover plate and a tube shell in a floating mode, weights are arranged at the top end of the parallel welding wheel support, and the welding pressure of the parallel welding wheels on the welding seams is adjusted by increasing or reducing the number of the weights, so that the adjustment of the self-adaptive welding pressure in the welding process is realized; and a shoulder-pole-shaped semi-square-shaped jacking frame body is arranged between the left parallel welding wheel support and the right parallel welding wheel support, the floating parallel welding wheel support is lifted and lowered through jacking connection of eccentric wheels to the semi-square-shaped jacking frame body, and conversion between the welding state and the to-be-welded state of the two parallel welding wheels is completed. The sealing and welding quality of the packaging assembly is greatly improved.

The present invention provides a stable liquid pharmaceutical composition containing animal dander allergen. The liquid pharmaceutical composition comprises a therapeutically effective amount or a diagnostically effective amount of animal dander allergens, an effective buffering amount of a pH 5.0-7.0 buffer, aminocaproic acid with a concentration range of 0.1%-2.0% w/v, Polyols and pharmaceutical preservatives in concentrations ranging from 30% to 70% v/v. The liquid pharmaceutical composition can be made into dosage forms such as oral, subcutaneous injection, sublingual, aerosol, nasal cavity, skin pricking, etc., and can be applied to the diagnosis or treatment of allergies induced by animal dander allergens disease.

The invention discloses a tray transfer method for a microelectronic packaging assembly between high-vacuum closed cavities. The problem of how to complete tray transfer in a limited space by adopting a simple and economical driving mechanism is solved. A gate valve is arranged between two high vacuum chambers for microelectronic packaging assembly tray transfer, a transfer mechanism is arranged in a second activated process chamber, and a driving motor of the transfer mechanism is arranged outside the process chamber, so that the independent sealing performance of the process chamber is ensured, and meanwhile, the stable and reliable movement of the tray is realized due to good guidance; compared with a vacuum motor, the driving motor reducer adopts a common motor, so that the cost is reduced and the service life is prolonged; besides, the length of a mechanical arm is shortened, the intermittent segmented conveying of the trays is achieved through reciprocating work of the mechanical arm, and the purpose of reducing the occupied space of the tray transferring mechanism is achieved; the process cavity is independent, the transfer of the high-vacuum trays is achieved, and the driving structure is simple, economical, reliable and durable.