230results about How to "Prevention is cheap" patented technology

An antenna device has semi-conductive antenna bodies each having a predetermined length, which are positioned on a dielectric substrate, and control electrodes that are respectively connected with the semi-conductive antenna bodies. Direct-current biased voltage applied across each of the control electrodes is controlled to switch each of the antenna bodies between their insulation state and their conductive state.

The invention relates to a method for screening drug target genes based on a CRISPR/Cas9 high-throughput technology. The method comprises the steps of firstly establishing a sgRNA library; secondly packaging the sgRNA library by using slow viruses, and collecting the viruses; thirdly screening the sgRNA library in a cancer cell line; fourthly extracting cells obtained by screening and genome DNA of the cells before screening; and finally enriching sgRNA in genome DNA. Compared with the prior art, the method has the advantages that a CRISPR/Cas cell screening process is improved, the virus infection efficiency is determined with a simple and convenient method by utilizing puromycin resistance of infected cells, and MOI values of the viruses are determined; more importantly, a virus packaging method is greatly optimized, so that the virus packaging efficiency is improved to be more than 5 times that of a conventional method, and large-scale drug target screening cost can be greatly reduced; and the method is used for promoting industrialization of cancer drug target screening.

The invention discloses an electric power steering system of a new energy vehicle and a control method of an electric control unit thereof. The electric control unit comprises an input circuit which is used for connecting with a sensor part, an MCU and an output circuit which is used for connecting with an actuator part, wherein both ends of the MCU are connected with the input circuit and the output circuit; the control method adopts an improved PI algorithm; integral separation and dead zone processing are carried out, and the smooth and steady follow of power torque under the condition of low cost of hardware is realized by the current closed-loop control of the variable parameter PID based on vehicle speed grouping; the duty ratio nonlinear compensation technique is adopted in the mode of limited bipolar pulse width modulation; the duty ratio is corrected by the current in the limited bipolar mode. When the current is across a dead zone, namely when the target current is changed from positive to negative or from negative to positive, and when the power is from zero to existence, the duty ratio is directly arranged near the target current value to be accurately adjusted by the current closed-loop feedback, and the current of the motor can reach the target value.

The invention discloses a frequency scanning array antenna based on a quasi-surface plasmon waveguide. The frequency scanning array antenna based on the quasi-surface plasmon waveguide is characterized in that an array element is coupled and excited through the quasi-surface plasmon waveguide and the range and the phase, which need exciting, of the array element are acquired through the adjustment of the position of the array element to achieve required radiation characteristics. A plurality of advantages are centralized on the array antenna with the quasi-surface plasmon waveguide as a feed network, the efficiency of the feed network is high, the antenna is simple in structure, frequency scanning can be achieved and various polarization characteristics can be achieved through changing of the form of the array element. A plurality of embodiments are given and a specific example simulation result is finally given. Other specific embodiments can be formed based on the same idea after the structure of the quasi-surface plasmon waveguide is reasonably changed and different array element forms are adopted. The frequency scanning array antenna based on the quasi-surface plasmon waveguide can be used for wireless communication and radar systems.

The invention belongs to the technical field of medicines, and relates to a method for extracting astaxanthin from haematococcus pluvialis. The method comprises the steps of culturing a seed stock solution in a glass apparatus with a drainage system, and carrying out later amplification culture of the haematococcus pluvialis and accumulation culture of the astaxanthin after 10-15 d; centrifuging a culture in an exponential growth period of seed culture; and inoculating cell clusters in a BBM basal medium to obtain a primary culture. The later accumulation culture of the astaxanthin is amplification culture by using a breathable plastic bag type simple device provided by the invention. In the accumulation stage, a stress culturing method is adopted to obtain a lab-scale test haematococcus pluvialis culture; and haematococcus pluvialis powder is obtained by spray drying. According to a preparation technology that extracts astaxanthin from the haematococcus pluvialis by adopting an ultrasonic cell disruption assisted mixed solvent extraction method, the haematococcus pluvialis powder is added in an organic solvent to carry out ultrasonic cell disruption, and then the astaxanthin is obtained by the steps of reflux extraction in a water bath, suction filtration, filtrate merging and concentration. Compared with a conventional direct extraction method, the method provided by the invention saves extraction time, and increases astaxanthin yield.

The invention provides a method for extracting fulvic acid from straw pulp black liquor, comprising: acid with the conditioning of below pH5 is added into straw pulp black liquor mixed by an alkali process and an ammonium sulfite method so as to separate lignin, later flocculant is added for removing the lignin by filtration, finally the filtrate is the fulvic acid solution; and the fulvic acid solution can also be dried for preparing crude fulvic acid or further purified for obtaining fulvic acid of high purity. The invention can also treat two types of black liquid simultaneously, be used as soil conditioner or water-reducing agent, and can get good economic benefit; the extracted fulvic acid has high price; and the lignin, which is a by-product of the invention, also has wide usage.

A rice planting method for obtaining rice planted in a field with frogs belongs to the technical field of the stereo ecological effective production combining scientific planting and culturing. The rice planting method is as follows: frogs are cultivated while rice is planted in the rice field; specific measures are as follows: a waterhole is arranged at a water inlet of the rice field; a ditch isarranged along the periphery of ridge of the rice field; a plastic thin film with 1.2m height surrounds a defensive wall which preventing the frogs from escaping on the periphery of ridge of the ricefield; mound for the wintering of the frogs is arranged in the rice field; after rice is planted in the rice field, the water depth needs to be kept over 3cm; about five thousands of frogs are cultivated per acre. Growing environment of the rice is used for cultivating the frogs which prey on pests and other insects growing in the rice field; excrement of the frogs is used as fertilizer of rice growing. Water body resources and ecology environment of the rice field are fully utilized by cultivating the frogs in the rice field, thus being capable of achieving effects of rice and frog intergrowth and mutual benefit, efficiency improvement and energy consumption. The rice planted in the field with the frogs is pure green superior rice with high grade; and the frogs have very high economicalvalue.

The invention discloses an optical filter, which comprises a substrate and optical films on the two sides of the substrate, wherein the substrate is a blue plastic substrate; a blue glass substrate is substituted by the blue plastic substrate; and thus, the production cost, the product weight and the product size can be reduced and the yield of products can be improved. In a preferred technical scheme, in order to improve the adhesion between the substrate and the optical films on the two sides of the substrate, an HfO2 transition layer is arranged between the substrate and the optical films. In order to improve the deformation of the blue plastic substrate, the optical films are an infrared ray isolating filter film on one side of the substrate and an infrared-ultraviolet ray isolating filter film on the other side of the substrate. The optical filter has the advantages of low cost, light weight, small size and capability of being widely used for card type cameras, mobile phone cameras, monitoring systems and the like with small image chip areas, particularly intelligent mobile phones increasingly used at present.

The invention relates to a novel method of extracting fluoroquinolone type medicines in faeces of livestock and poultry. The method includes 1) grinding a freeze-dried sample of faeces of livestock and poultry, and sieving; 2) weighing 0.50-1.00 g of the sample, adding into a centrifuge tube, adding 5-10 mL of a calcium chloride-hydrochloric acid buffer solution having a concentration of 50%, performing vortex mixing for 1 min, performing ultrasonic extraction for 15-30 min, centrifuging at a speed of 4500 r/min for 10 min, and collecting the supernate; 3) separately subjecting standard samples of one or more than two of the fluoroquinolone type medicines to qualitative analysis by a high performance liquid chromatography instrument, and determining retention time; 4) creating a standard curve for each fluoroquinolone type medicine compound by adopting peak area as a vertical coordinate and adopting a concentration (ng/mL) corresponding to each fluoroquinolone type medicine as a horizontal ordinate; and 5) measuring the content of each target compound in the sample to be measured by high performance liquid chromatography, determining the type of each target compound according to the retention time, and determining the content of each target compound according to the corresponding standard curve. The method is good in repeatability and high sensitivity.

The invention discloses a variable-pitch servo driver with a function of energy storage, which belongs to the technical field of wind power generation. The variable-pitch servo driver comprises a rectifying circuit, a current limiting circuit, an energy-storage circuit, a braking circuit and an inverting circuit, wherein the input end of the rectifying circuit is connected with a power grid so asto transmit alternating voltages, one output end of the rectifying circuit is connected with the input end of the current limiting circuit so as to transmit direct voltages, and the other output end of the rectifying circuit is connected with one input end of the energy-storage circuit so as to transmit the direct voltages; and the output end of the current limiting circuit is connected with the other input end of the energy-storage circuit so as to transmit the direct voltages subjected to current limiting, the output end of the energy-storage circuit is connected with the input end of the braking circuit so as to transmit the direct voltages, the output end of the braking circuit is connected with the input end of the inverting circuit so as to transmit the direct voltages, and the output end of the inverting circuit is connected with a driven motor so as to transmit the alternating voltages. The variable-pitch servo driver of the invention is not required to be equipped with other standby powers, is compact in structure, is beneficial to shorten the volume of the whole system, and significantly reduces the cost of a variable-pitch system.

The invention relates to a refrigeration, supply heat and hot water system capable of performing solar evaporative cooling and capillary radiation. The refrigeration, supply heat and hot water system is characterized in that a circulation water box in an evaporative cooling system is connected with a water pouring device through a circulation water pump, and the water inlet and water outlet of the circulation water box are respectively connected with the water outlet of a first water collector and the water inlet of a first water knockout drum; the water inlet of the first water collector is respectively connected with the water outlet of an air cooler positioned in an evaporative cooling system and the water outlet of a second water collector, the water outlet of the first water knockout drum is respectively connected with the water inlet of the air cooler and the water inlet of a second water knockout drum, and the water outlet of the second water knockout drum and the water inlet of the second water collector are respectively connected with the water inlet end and water outlet end of a capillary radiation tail end in a room; and a fresh air dehumidifier is communicated with the room, a capillary gravity circulation cabinet is arranged in the room, and the fresh air dehumidifier and the capillary gravity circulation cabinet are respectively connected with the water collector. The refrigeration, supply heat and hot water system provided by the invention has the advantages that the structure is simple, the use is convenient, an energy source is saved, and the fresh air requirements of an air conditioner in winter and summer, the domestic hot water requirements of the whole year and the fresh air requirements of transition seasons are met.

The invention belongs to the technical field of nano materials and electro-chemical catalysis, and particularly relates to a preparation method for efficiently plaining a noble metal and improving electro-catalytic performance thereof. The preparation method comprises the following steps: uniformly mixing raw materials in a certain element molar ratio, placing into a closed reaction kettle to perform in-situ reduction and loading growth reaction on platinum-based alloy to obtain platinum-based alloy nanoparticles which are uniformly loaded on porous carbon; plaining platinum alloy nano-crystalto obtain a platinum nano-crystalline catalyst which only contains platinum element and is rich in hole and lattice imperfection. The plained platinum nano-particles have the catalytic effect remarkably superior to that of a carbon-loaded platinum catalyst in current commercial application. The nano-crystalline noble metal platinum has the advantages of simple process steps, short flow, adjustable platinum nano-crystalline appearance structure and the like, is easy for large-scale production, and has an important value in the fields of industrial catalyst or other subjects.

The invention discloses an eccentric star-like cinder valve. The eccentric star-like cinder valve is used for discharging ash and unloading below an ash bucket and a storage bin in the industry such as environmental protection, metallurgy, building materials and the like. The eccentric star-like cinder valve mainly solves the technical problems that materials in a conventional cinder valve cannot be fed uniformly and the like. The technical scheme comprises the main points that: an impeller is arranged in a cavity of an eccentric shell which is similar to a volute shape; bearings are arranged at the two ends of the shell; end covers and the like form approximately closed space with the shell; a material inlet hopper and a material outlet hopper are arranged on the upper surface and the lower surface of the shell; and a material inlet is formed on one side of the radial direction of the impeller and is deviated from the rotation geometric centre of the impeller. The gravity of materials entering the impeller from the material inlet generates tangential force to one side of the impeller, so that the impeller is rotated automatically. A shaft end connected with the impeller is extended out of the shell, and an electromagnetic brake is arranged on the shaft end, so that the impeller is controlled to be rotated according to expected requirements. Or a motor speed reducer is arranged on the shaft end, the motor speed reducer plays a role in boosting when the gravity of the materials is not enough and the impeller is rotated automatically. The cinder valve in the eccentric structure has no air leakage and gas leakage phenomena, can rotate automatically without additional power in general situations, and can fulfill the aim of discharging ash; the power of a matching motor is only 1/3 to 1/5 of a conventional valve; an energy-saving effect is very obvious; the structure is simple; the manufacturing cost is low; and the eccentric star-like cinder valve is convenient to maintain.

The invention discloses a method for extracting rapeseed oil and passivated myrosinase from rapeseeds and belongs to the technical field of agricultural resources.The method has the advantages that raw materials are soaked by deionized water, moisture in cells is turned into steam during steam explosion or pressurization heat-moisture treatment, and cell walls are broken to allow the cell structure to be loose and promote the dissolution of grease in the cells; an ethanol solution is used as the oil extraction medium, glucosinolates and most degradation products are allowed to enter a water phase, the glucosinolate and glucosinolate degradation product contents in cake are lowered, and the detoxification procedure of rapeseed cake is reduced; enzyme use is avoided, oil production cycle is shortened, production cost is reduced, oil product quality is optimized, and the problems that the glucosinolate and glucosinolate degradation product contents of the cake obtained by a traditional rapeseed process are high, high-quality protein resources are wasted, a large amount of enzyme needs to be used, cost is high or environment pollution is severe, and the like are solved.

The invention relates to an optical system applied to monitoring, shooting and vehicles. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an image surface which are sequentially arranged from an object space to an image space. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of optical glass, and the surface types of the lenses are all spherical surface types. The optical system applied to monitoring, shooting and vehicles aims at overcoming the shortcoming in the prior art.