134results about How to "Less susceptible to contamination" patented technology

A semiconductor chip production method including the steps of: forming a front side recess in a semiconductor substrate; depositing a metal material in the front side recess to form a front side electrode electrically connected to a functional device formed on the front surface; removing a rear surface portion of the semiconductor substrate to reduce the thickness of the semiconductor substrate to a thickness greater than the depth of the front side recess; forming a rear side recess communicating with the front side recess in the rear surface of the semiconductor substrate after the thickness reducing step; and depositing a metal material in the rear side recess to form a rear side electrode electrically connected to the front side electrode for formation of a through-electrode.

The invention relates to a pretreatment method of Acesulfame-K, comprising the following steps: firstly conducting nitric acid digestion treatment, then conducting high-temperature ashing treatment, and finally dissolving. The pretreatment method disclosed herein is an improvement based on orginal dry ashing and wet ashing, simplified the operation process, and effectively reduces the possibility of sample contamination. The invention further provides a detection method for detecting potassium in Acesulfame-K after pretreating the Acesulfame-K with the above pretreatment method, characterized by pretreating an Acesulfame-K sample with the above pretreatment method and then conducting instrument detection of potassium, thus the precision of the detection can be raised, and the content of potassium in the original sample can be accurately reflected.

Provided is a tablet packing machine for which cleaning the inner surface of the temporary storage structures (132) is easy. A simultaneous driving mechanism (133) and multiple open-close mechanisms (135) of multiple temporary storage structures (132) are linked by multiple linking structures. The linking structures are configured so that the linkages are released when the entire temporary storage structure (132) or the portion containing the open-close mechanism (135) is drawn out of the cabinet (110) and are linked when the entire structure or portion thereof which contains the open-close mechanism (135) is pushed into the cabinet (110A).

The invention discloses a method for preparing norfloxacin tablets. The method comprises the following steps of: sieving norfloxacin with a sieve of 40 to 100 meshes, sieving a disintegrating agent with a sieve of 60 to 100 meshes, sieving a lubricating agent and a flow aid with a sieve of 80 to 120 meshes, mixing the norfloxacin with a large part of disintegrating agent uniformly, mixing less than 2 percent of disintegrating agent, the lubricating agent and the flow aid uniformly, adding into the mixed powder, mixing uniformly, tabletting, and thus obtaining the norfloxacin tablets. The norfloxacin tablets comprise the following raw materials in percentage by weight: 20 to 80 percent of norfloxacin, 5 to 79 percent of disintegrating agent, and 1 to 8 percent of lubricating agent and flow aid. 5 to 70 percent of filling agent can also be added. The mixed materials obtain high flowability, excellent compression property and adhesive property, high attachment and low sensitivity to the lubricating agent through a large quantity of tests, advantage complementation of auxiliary materials, proper formula proportioning, reasonable granularity distribution and accurate powder mixing sequence. The method overcomes the defects of common material non-layering, non-uniform content, high tablet height difference, tablet powder fall, slow disintegration and the like in the direct tabletting production process, and solves the problems of color change of tablet cores, low dissolubility and the like of the wet granulation process.

The invention belongs to the chemical detection analysis field and in particular relates to a technology for rapidly determining lead and chromium in dairy products by use of a microwave digestion-graphite furnace atomic absorption spectrometry. The method comprises the following steps: (1) preprocessing a sample; (2) preparing lead and chromium standard curve series solutions; (3) drawing lead and chromium standard curves; and (4) measuring the sample. Compared with the prior art, the method has the beneficial effects that the sample preprocessing time is short and is only 2.4h, the operation is simple, the harm to laboratory technicians can be reduced to the maximum extent due to use of microwave digestion, the environment is friendly, the whole microwave digestion process of the sample is performed in a closed environment, a small amount of target detection substances are volatized, the contamination of external substances is avoided, the detection result has high accuracy and good repeatability, lead and chromium in the dairy product can be measured simultaneously, and the method is suitable for the batch processing and measurement of samples, is suitable for determining the contents of lead and chromium in various samples such as raw milk, sterilized milk, modified milk, milk powder, fermented milk and the like, and has wide application range.

The invention discloses a sample liquid drop granular forming device. The sample liquid drop granular forming device is used for solving problems in the prior art that it is inconvenient for forming of in vitro molecular diagnosis sample sampling liquid drop, the stability and the uniformity of the formed liquid drops are poor, pollution by the external environment is easily caused, and detectionaccuracy is low. The sample liquid drop granular forming device comprises a machine frame, and a fluid driver; the lower end of the machine frame is connected with a bottom plate; a sample support, apipette head support, and a carrying packaging chip are arranged on the bottom plate; a slide carriage is arranged on the machine frame, and is designed to be capable of moving transversely; the lowerend of the slide carriage is provided with a lifting pedestal capable of lifting; the lifting pedestal is connected with a liquid drop forming machine head part capable of vibrating; a pipette head pedestal matching pipette heads is arranged on the liquid drop forming machine head part; the carrying packaging chip comprises a chip main body; the chip main body is provided with an oil collecting tank, an inclined slide, a liquid drop storing tank, an oil discharge runner, a liquid level control oil tank, and an oil storing tank; the oil collecting tank is connected with an elastic sealing cover; and the chip main body is provided with gas vent communicated with the oil storing tank.

The invention provides a method for inducing neural stem cells by use of non-integrated plasmid vectors. The method comprises the steps of extraction of mononuclear cells from blood, expansion of the mononuclear cells in blood, electrotransfection of non-integrated plasmids and culture of neural stem cells. Mononuclear cells in human peripheral blood are reprogrammed into the neural stem cells which can be expanded by 60 generations or above in vitro to express related genes of the neural stem cells, nerve cells, astrocytes and oigodendrocytes can be differentiated, and the differentiated nerve cells have the electrophysiological characteristic. The method is simple to operate and extremely less in trauma.

The invention discloses a method of induced neural stem cells and a composition. Through the method and the composition, peripheral blood mononuclear cells can be induced to form neural stem cells. The neural stem cells can express neural stem cell related genes, and can disintegrate out nerve cells, astroglia cells and oligodendrocyte. Dopaminergic nerve precursor cells formed through in vitro induction and disintegration of the neural stem cells are transplanted into the striatum corpora of a PD mouse model, no tumors are formed, the ethology of a mouse Parkinson 's disease model can be improved, and the process of the Parkinson 's disease can be delayed. The neural stem cell inducing and disintegrating method provided by the invention is simple and quick to operate, small in traumatic occlusion and good in safety, and is hopefully used for treating the Parkinson 's disease.

The invention discloses a method for preparing positive pole material LiFePO4 for a lithium ion battery, which uses ferrous oxalate as a ferrous resource, and adopts a nano ceramic grinding and dispersion machine. The method comprises the steps as follows: preparing raw materials including the ferrous oxalate, a lithium resource, a phosphor source and a metal element doped compound; mixing, pulping and drying the raw materials, and obtaining a powdery precursor; pre-burning the powdery precursor; performing secondary material proportioning of products obtained via pre-burning, grinding the mixture to be nano-grade by adopting the nano ceramic grinding and dispersion machine, sintering the mixture after drying, and obtaining the positive pole material LiFePO4 of the lithium ion battery. The prepared LiFePO4 is 0.5-6 micrometres in particle size D50, 15-25 m<2>/g in specific area and not less than 1.5 g/cm<3> in tap density. According to the invention, the technique is simple and easy to control, the production cost is low, components of the product are uniform, and both the physical and chemical properties and the electrical performance are favorable.

The invention discloses a method for preparing sulfur-free konjac fine flour. The method comprises the following steps of: a, selecting a raw material: selecting fresh konjac without rot or foreign matters as the raw material, wherein pesticide residue and heavy metal residue of the fresh konjac are qualified according to the detection; b, peeling and removing apical buds: peeling and removing the apical buds from the selected qualified fresh konjac; c, cleaning: cleaning the fresh konjac; d, quickly squeezing: conveying the cleaned fresh konjac to a squeezer to perform quick squeezing to obtain konjac residue; e, crushing: crushing the konjac residue into granules of 40 to 120 meshes; and f, drying: drying the granules obtained at the step d at the temperature of between 120 and 160 DEG C to obtain the sulfur-free konjac fine flour. The method for preparing the sulfur-free konjac fine flour simplifies the production process and reduces the production cost; the fresh konjac does not produce brown stain during sulfur-free processing; and the obtained sulfur-free konjac fine flour has good luster and high quality.

The invention relates to the field of veterinary biological products and particularly relates to a preparation method of a mink canine distemper virus live vaccine. The method comprises the following steps: inoculating a bioreactor with sensitive cells for vaccine preparation, and culturing by using a micro-carrier; after the sensitive cells are cultured by over 50% and grow into a dense single layer, inoculating the bioreactor with canine distemper virus for enrichment culture; harvesting the virus culture liquid and micro-carrier; performing freeze-thawing and removing the micro-carrier and cell debris to obtain virus liquid; and blending the virus liquid to obtain the vaccine. By improving the reaction conditions of each step and optimizing the production flow, the method provided by the invention realizes the technical effects of short production cycle, high virus titer, stable product quality, increased production efficiency and low side effect.

The invention belongs to the technical field of food processing and provides a method for quickly freezing cooked crayfish meat at low temperature. The method has the following beneficial effects: under the condition of higher low temperature, the preservation time of the cooked crayfish meat can be lengthened to at least six months, thus the quality of the crayfish meat is assured; the crayfish meat at the moment does not obviously differ from the just cooked crayfish meat in quality, has unique flavor and strong delicate flavor, meets the requirement of people for crayfish all the year round, is quickly frozen at minus 20 DEC C and is stored and circulated under the condition of cold chain at minus 18 DEG C, thus not only lowering the freezing treatment costs of enterprises but also solving the problems that the raw crayfish meat is difficult to strip off the crayfish and is easy to pollute and the whole structure and beauty of the crayfish meat are easier to damage in the processing process; meanwhile, the crayfish is not easy to pollute and the product is not easy to perish; and the method has extensive prospect and advantages in the crayfish industry and has stronger popularization and application values.

A dispenser for a soft-serve food product includes a housing having a dispensing chute and a piston having a head positioned therewithin. A lateral wall, the piston head, and a front door define an enclosed hollow space. The head is slidable within the lateral wall for squeezing a deformable container to dispense product through the chute. A system for preparing and dispensing a soft-serve food product includes a tempering freezer for raising a temperature of the food product from hard-frozen to a condition for soft-serve dispensing. An apparatus for packaging a soft-serve confection into a multiple-serving-size container for transport includes a blender for blending ingredients together to form a blended product and a device for transferring the blended product into a deformable container. The deformable container filled with the blended product is transferred into a substantially rigid mold and frozen to a hardened state for transport and retention.

The invention discloses an artificial mouth simulating device, comprising a culture medium tank, multi-channel pumps, flow chambers, drug sample solution bottles and a waste solution collection tank, wherein the culture medium tank is connected with one multi-channel pump by pipelines; the multi-channel pump is connected with the flow chambers by pipelines; Luer connectors are arranged on the pipelines between the multi-channel pump and the flow chambers and are connected with the drug sample solution bottles by pipelines; the flow chambers and the waste solution collection tank are connectedby pipelines; and the other multi-channel pump is arranged on the connection pipelines between the flow chambers and the waste solution collection tank. The device has the beneficial effects of simple structure, low cost, short cycle of experiment, good repeatability of the experiment result, high precision control and low possibility of being polluted.

The invention discloses a high-yield and disease-resistant planting method for lentinula edodes. The method comprises the following steps that firstly, materials are prepared, wherein a lentinula edodes culture medium is prepared from dried poultry litter, bamboo leaf residues, Chinese chestnut peel, wheat bran, soybean straw, corn stigma, dried silkworm manure, saw powder, antibacterial sustained-release filler and a sterilization additive; secondly, high-temperature sterilization is conducted, wherein the lentinula edodes culture medium mixed evenly in the first step is subjected to high-temperature sterilization; thirdly, inoculation is conducted, wherein the lentinula edodes culture medium obtained after high-temperature sterilization is inoculated with solid lentinula edodes strain inoculating sticks, stirring is conducted after sealing, and a culture material is obtained; fourthly, bagging is conducted, wherein the lentinula edodes culture medium inoculated in an aseptic environment is bagged, air holes are formed, spawn running is conducted, after culture, a bag is filled with mycelia, and then conventional culture is conducted. By means of the planting method for the lentinula edodes, the yield and the quality of the lentinula edodes can be effectively improved.

The invention discloses honeycomb ceramic. The honeycomb ceramic is prepared by the following steps of: adding 1 to 8 weight percent (dry-weight based weight ratio) of soluble inorganic salt into a raw material; performing full vacuum refining and molding; drying at the temperature of 100 DEG C for 0.5 to 2 hours; drying at the temperature of 150 DEG C for 0.5 to 2 hours; and sintering at the temperature of between 1,100 DEG C and 1,180 DEG C.

The invention relates to an energy-saving environment-friendly municipal road sweeping device. The energy-saving environment-friendly municipal road sweeping device comprises a device body, a sweepingmechanism and a water mist mechanism. The sweeping mechanism comprises a mounting base, a sweeping brush and a sweeping motor for driving the sweeping brush to rotate; the sweeping brush faces the moving direction of the vehicle body and makes contact with the ground away from the vehicle body; and the contact radian of the cleaning brush and the ground is a quarter of the overall radian of the sweeping brush. The water mist mechanism comprises a water tank fixed to the device body, a water pump connected with the water tank and a spray head connected with the mounting base, the spray head islocated on the side, facing the moving direction of the sweeper body, of the sweeping brush, a nozzle of the spray head faces the ground, and a water outlet of the water pump is connected with the spray head. When the sweeping mechanism is used for treating dust, raised dust is bonded with water drops through the water mist mechanism, at the moment, the weight of the dust is increased to enable the dust to fall on the bottom face, the environment is not prone to being polluted by the dust, meanwhile, the dust is driven by the sweeping mechanism to the lower end of the vehicle body to be collected by the vehicle body, and the dust is easier to clean.

The invention relates to an electric smoking device with a filter tip. The electric smoking device comprises a filter tip section, an isolation section, an electric heater, a control system and a shell, wherein the filter tip in the shell is positioned at the upper end of the electric heater, and is separated from the electric heater through a spacer with a hole and the isolation section with a free cavity; a certain amount of special tobacco powder or tobacco substitute material is attached in the filter tip to meet the smoking habit of a user and enhance the comfort of smoking tobacco products; the filter tip is arranged in the shell, and the user cannot touch the filter tip with hands, so that the filter tip is difficultly polluted by bacteria on the hands.

The invention discloses a preparation method of a high-purity aluminum metaphosphate powder. The preparation method comprises the four steps of preparation of an aluminum dihydrogen phosphate (Al(H2PO4)3) solution, preparation of acid aluminum phosphate monohydrate (AlH2P3O10.H2O), preparation of powdery acid aluminum phosphate and preparation of powdery aluminum metaphosphate. According to the method, the prepared aluminum metaphosphate can be prepared into the powdery aluminum metaphosphate without pulverizing equipment, bonding to a sintering container does not occur in the production process, the prepared aluminum metaphosphate has high purity, the concentration of various non-ferrous metal element impurities is 5 ppm or below, the equipment investment required for the process is small, and the method is suitable for large-scale industrial production.

The invention relates to a device for controlling the oxygen concentration in the magnetotactic bacterium culturing process and a culture method, and belongs to the technical field of control of magnetotactic bacterium culturing condition. The device comprises a gas source (1), a penicillin bottle (2) and a gas passing pipe (3), wherein the gas source (1) comprises a nitrogen source and an oxygensource; the gas inlet of the gas passing pipe (3) is connected with the gas source (1); the gas outlet of the gas passing pipe is connected with an injector (4) without a piston, and a syringe needleof the injector (4) without a piston is connected with the penicillin bottle (2); and the injector (4) without a piston is filled with cotton (5). The device is simple and easy to operate, can meet the micro-aerobic requirement, ensures that bacteria in the operating process cannot be easily polluted, is low in cost, and is simple and feasible.

The invention discloses an electrostatic spinning device having a porous nozzle. The electrostatic spinning device includes a spinning receiving plate, a porous nozzle silk spraying device used for spraying nano fibers, a spinning solution storage device, a pressure pump used for transporting a spinning solution to the porous nozzle silk spraying device, and a high-voltage generator used for providing high-voltage static electricity for the porous nozzle silk spraying device; the porous nozzle silk spraying device includes a silk spraying container made of insulating materials, the top of the silk spraying container is provided with a plurality of silk spraying holes communicated with an inner cavity of the silk spraying container, each silk spraying hole is internally provided with a metal nozzle, and all the metal nozzles are communicated with each other and connected with the high-voltage generator; the two ends of the pressure pump is connected with an inner cavity of the spinning solution storage device and the inner cavity of the silk spraying container through the spinning solution conveying pipes respectively. The electrostatic spinning device can effectively solve the pollution problem of a spinning solution and the solvent evaporation problem of the spinning solution, the rejection phenomenon between sprayed jet flow does not occur, and a prepared nano fiber membrane is uniform in distribution.

The invention discloses a water transfer printing method for a decorative plate of a plant fiber molding wall. The method comprises the following steps: (1), uniformly coating a layer of poly urethane (PU) transparent primer on the front side, back side and periphery of the decorative plate of the plant fiber molding wall, then drying the PE transparent primer; (2), regulating the PE transparent primer into the required color, uniformly coating the PE transparent primer on the front side and periphery of the decorative plate, and then drying; (3), polishing the primer layer surface on the front side of the decorative plate smooth; (4), upturning the face of a water transferring printing film with a pattern and laying the water transferring printing film on a water surface, uniformly spraying an activator on the water transferring printing film, pressing the front side of the decorative plate on the water transferring printing film after 1 to 5 minutes and pasting the front side of the decorative plate with the water transferring printing film, and the taking the materials out and drying the materials; and (5), washing impurities remained on the front side of the decorative plate by clean water firstly, then drying the decorative plate, and uniformly spraying the PU furniture paint on the front side of the decorative plate and then drying to obtain the decorative plate. The water transfer printing method for the decorative plate of the plant fiber molding wall, provided by the invention, is simple in process; the water-resisting property and stain-resisting property of the surface of a prepared product are greatly improved; and the prepared product cannot be damaged and polluted easily.

The invention discloses a preparation method of a traditional Chinese medicine composition for preventing and treating irregular menstruation. The method comprises the following steps: concentrating a certain quantity of raw materials medicine including motherwort, cyperus tuber, sweetgum fruit, hemlock parsley, seed of cowherb and spatholobus stem into water extract diluted extractum by water extraction, or concentrating the raw material medicine into water extraction and alcohol precipitation diluted extractum by water extraction and alcohol precipitation, then putting dextrin, starch or the like used as substrates into a one-step granulating machine, spraying the water extract diluted extractum or the water extraction and alcohol precipitation diluted extractum used as a binding agent into the one-step granulating machine for one-step granulation, finally grinding grains, and adding other auxiliary materials to prepare traditional Chinese medicine preparation for oral administration. The method can significantly reduce the quantity of the auxiliary materials, shorten the processing time and the heating time for condensation and drying, avoid the damage to the effective ingredients of the traditional Chinese medicine composition, simplify the process flow and reduce the energy consumption. The flowability of the prepared granules is high, the disintegration of compressed tablets is fast, the production process is not easily polluted, and the quality of finished products is ensured well.