177results about How to "Improve stimulation effect" patented technology

The invention discloses a myoelectric feedback control electric stimulation device and a control method thereof, relating to the field of medical instruments. The control method comprises the steps of: collecting a myoelectric signal of a tested object; transmitting the myoelectric signal to a myoelectric signal amplifying unit; converting the myoelectric signal into a digital myoelectric signal; transmitting the digital myoelectric signal to a signal processing and controlling unit; calculating the myoelectric amplitude of the digital myoelectric signal; obtaining the myoelectric amplitude; and judging whether the myoelectric amplitude equals to the optimal myoelectric amplitude; if yes, not changing a stimulation mode, generating a stimulation waveform of the stimulation mode by an electric stimulation generating unit, and carrying out stimulant therapy on the tested object through stimulating electrodes; and if not, adjusting the stimulation mode by the electric stimulation generating unit and the signal processing and controlling unit, using the adjusted stimulation mode as a stimulation mode for the next time, generating a stimulation waveform of the stimulation mode, and carrying out stimulant therapy on the tested object through the stimulating electrodes. According to the myoelectric feedback control electric stimulation device and the control method thereof, the purpose of achieving the optimal stimulation effect in different stimulation modes is realized through adjustment of the stimulation mode.

4,4-difluoro-1,2,3,4-tetrahydro-5H-1-benzazepine derivatives, which have excellent arginine vasopressin V2 activity and are useful for a drug for the treatment of central diabetes insipidus and / or nocturia.

A compound of the formula:wherein Ar is an aromatic ring assembly group which may be substituted or a fused aromatic group which may be substituted; X is (i) a bond, (ii) -S-, -SO- or -SO2-, (iii) C1-6 alkylene, C2-6 alkenylene or C2-6 alkynylene, etc., (iv) -CO-O- or (v) -(CH2)p-X1-, -(CH2)p-X1- (CH2)q-, -(CH2)r-CO-X1-, -SO2-NR8- or -(CH2)r-SO2-NR8- wherein X1 is O or NR8, R8 is H, a hydrocarbon group which may be substituted or an acyl, p is 0 to 5, q is 1 to 5, p+q is 1 to 5, and r is 1 to 4; Y is a divalent C1-6 aliphatic hydrocarbon group optionally containing O or S, which may be substituted; R1 and R2 each is H or a lower alkyl which may be substituted, or R1 and R2 form a N-containing heterocyclic ring which may be substituted; Ring A is a benzene ring which may be further substituted; and Ring B is a 4- to 8-membered ring which may be further substituted, or a salt thereof has the effect of inhibiting amyloid-beta protein production and / or secretion and is useful as a pharmaceutical composition for preventing and / or treating the neurodegenerative disease, etc.

The invention relates to a novel modification system and process of a hot-dry-rock thermal reservoir, characterized by the combination of two stimulation measure processes, thermal stimulation and chemical stimulation. The process is characterized in that a naturally present fracture network is destructed by thermal stimulation to enhance permeability, partial minerals, scale and obstruction in shafts and fractures are dissolved by the chemical stimulation, and flow guiding capacity of the fractures is further improved. The repeating of the process enables a larger range of thermal reservoirs to be modified. By using the process, the problem of the prior art that after thermal stimulation, part of the fractures are closed along with the rise of the temperature of a cooling area and the problem that that a chemical stimulant disappears nearby an injection location during its excess speed of reacting with rock minerals at high temperature are solved, and the process enables greatly reduction in the risk of frequent microseism in a reservoir modification process when compared to traditional hydrofracturing. The process is widely applicable to the modification of hot-dry-rock thermal reservoirs.

The invention discloses a white-light LED (Light-emitting Diode) manufactured by utilizing quantum-dot fluorescent powder, aiming to solving the problems of lower color rendering property, narrower color range, poor stability and the like of the traditional LED technology. In the invention, the white-light LED (Light-emitting Diode) manufactured by utilizing the quantum-dot fluorescent powder comprises a heat-radiating base 1, gold wires 2, a quantum dot and silica gel mixture 3, a purple light or blue light chip 4, a light extraction lens 5, filler silica gel 6 and two electrodes 6, wherein the two electrodes 7 are fixed at two ends of the heat-radiating base 1, the purple light or blue light chip 4 is fixed on the heat-radiating base 1 and between the two electrodes 7, the two electrodes 7 are respectively connected with the purple light or blue light chip 4 through the gold wires 2, the quantum dot and silica gel mixture 3 covers on the purple light or blue light chip 4, the fillersilica gel 6 is used for covering the two electrodes 7, the gold wires 2, the quantum dot and silica gel mixture 3 and the purple light or blue light chip 4 on the heat-radiating base 4, and the light extraction lens 5 is arranged outside the filler silica gel 6.

The invention relates to a method for preparing non-sintered ceramsite by adding dredged sludge. The method comprises the following steps: (1) pre-treatment of the dredged sludge; (2) material preparation: mixing and stirring smashed dredged sludge, cement, quick lime, gypsum and coal ash to prepare a dry mixture; the mass portions of the smashed dredged sludge, cement, quick lime, gypsum and coal ash are as follows: 60 to 80 parts of the dredged sludge, 1 to 6 parts of the cement, 1 to 6 parts of the quick lime, 1 to 6 parts of the gypsum and 3 to 15 parts of the coal ash; then uniformly mixing water glass with water to obtain a mixed solution of the water glass and the water, wherein the mass ratio of the adding amount of the water glass to the dredged sludge is 3 to 15: 60 to 80, and the adding amount of the water accounts for 40 to 60 percent of the total mass of the dry mixture and the water glass; (3) disc granulation; (4) primary curing of a product; (5) waterproofing work; (6) ultimate curing of the product, namely obtaining a finish product of the non-sintered ceramsite. According to the method provided by the invention, a large amount of dredged sludge can be added, the purpose of utilizing waste materials is realized, the requirements of a dredging Industry are met, the production energy consumption is low, and the produced non-sintered ceramsite can meet the demands of construction market.

The invention relates to a road deceleration interlaced vision marked line method, which comprises at least two lane road marked lines which are regarded as parallel lines along a traffic direction on a road, two oblique lines which are symmetrically arranged are respectively crossed with acute angles of the two parallel lines, ends which are arranged on the middle portions of the two parallel lines are connected by a transverse line which is perpendicular to the parallel lines, a section of an interlaced vision marked line are formed by an oblique line which is crossed by the two acute angles and the connecting parallel lines between the parallel lines, and a plurality of groups of equi-spaced interlaced vision marked line sections are arranged on the interval of the road with a certain length to form the road deceleration interlaced vision marked line. The road deceleration interlaced vision marked line has important roles at the aspects of increasing the visibility, reducing the vehicle speed and reducing the accident rate and the like, is capable of increasing the highlighting of road dangerous sections (intersections) and increasing the alertness of drivers, the conscious deceleration effect of the drivers is obvious, and the road deceleration interlaced vision marked line method has the practical value of preventing and reducing the happen of traffic accidents. The deceleration interlaced vision marked line method is capable of being used for the safe design and improvement of a road intersection, a traffic accident black-spot or a road section.

The invention discloses an electronic cigarette with an ultrasonic atomization function and tobacco liquid. An ultrasonic liquid atomization mode is set, and compared with general liquid heating atomization, the atomization rate of ultrasonic atomization is improved. Especially, the tobacco liquid is automatically sucked out of a tobacco liquid storage bin through a liquid level adjuster to be atomized by an ultrasonic atomizer, and compared with a current fiber absorption mode and the like, liquid waste is avoided, and meanwhile it can be guaranteed that airflow is sufficient after atomization. Meanwhile, due to the fact that the tobacco liquid directly enters the ultrasonic atomizer, the atomization rate can be further improved, atomization components can be even relatively, and the taste of a smoker can be proper. In addition, high-concentration propylene glycol and glycerin components are removed from the components of the tobacco liquid, and the taste of the smoker can be more comfortable.

The invention provides a novel white light luminescence device. The device comprises an excitation light source and a fluorescent layer configured to the upstream of the excitation light source. The fluorescent layer comprises a fluorescent powder group and a transparent material. The fluorescent powder group comprises a first fluorescent powder which is excited by the excitation light source to emit white light or visible light, and a second fluorescent powder which is simultaneously excited by the excitation light source to emit infrared light. In the invention, a white light color with highphotosynthetic efficiency can be provided, simultaneously, a high-efficient infrared wave band can be provided, and a new application characteristic is provided for an LED illumination light source.

The invention relates to a nitrogen oxides luminescent material and a preparation method and an application thereof, belongs to the semiconductor field. The chemical formula of the nitrogen oxides luminescent material is AxByOzN(2 / 3x+4 / 3y-2 / 3z):R, wherein A is one or more of Be, Mg, Ca, Sr, Ba, Zn, Li and Na, and B is one or more of Si, Ge, Zr, Ti, B, Al, Ga and In and contains at least Si. The luminescent material has stable chemical property and excellent luminescent performance, can be used as the blue / green-to-red nitrogen oxides luminescent material of white-light LED which can be excited by ultraviolet LED or blue light LED; the excitation wavelength is 300-500nm, the luminescent wavelength is 470-700nm, and the luminescent material can be used to prepare white light LED lighting sources or display sources by combining the blue light LED or ultraviolet or near-ultraviolet LED.

The invention belongs to the technical field of a building material, and particularly relates to an active compound activator of phosphorous slag powder and a using method thereof. The active compound activator is compounded of industrial waste carbide slag, desulfurized gypsum, and chemical reagents (or industrial materials) sodium silicate, aluminum sulfate and sodium hydroxide. A plurality of activation compound effects of alkali-activation, basic salt-activation, sulfate activation and the like are mainly utilized to completely activate the activity of the phosphorous slag powder. By adopting the product disclosed by the invention, the activity of the phosphorous slag powder can be effectively activated; the problems of delayed coagulation, low early strength, slow strength development and the like existing when the phosphorous slag powder is used as concrete or mortar admixture are obviously relieved. By adopting the active compound activator, application of the phosphorous slag powder as the admixture in the industries such as cement and concrete can be facilitated, waste materials are changed into precious materials; the economic benefits are improved; meanwhile, the problems of environmental pollution, soil waste and the like caused by stocking of a lot of phosphorous slag also can be solved; the environmental benefits are improved. In addition, the problem of shortage of excellent admixtures such as coal ash, slag powder and the like in the industries such as cement and concrete also can be relieved.

The invention discloses a droplet PCR amplification detection device based on a microfluidic chip. The device comprises the droplet microfluidic chip, an XYZ motion unit, a PCR amplification unit anda detection unit. A droplet containing a DNA molecule is introduced into the droplet microfluidic chip through a pipette after being generated, the chip is placed in the droplet PCR amplification unitto perform a PCR amplification reaction, and fluorochrome in the droplet is motivated through an LED lamp and light filter in the droplet detection unit, a camera is controlled to take a picture of the fluorescent droplet, the picture of the fluorescent droplet is focused through an autofocus algorithm and the control of a Z motion platform, and acquiring of images of different portions of the chip is completed through chip marking and the control of an XY motion platform; the captured images are spliced to obtain complete information of the chip droplet region images, thereby completing droplet PCR amplification detection. The device has the advantages that the operation is simple, the reagent consumption is low, the droplet stability is good, the detection accuracy is high, and the PCRamplification diagnosis and analysis can be efficiently completed.

The present invention discloses a near-infrared signal-controlled transcranial magnetic stimulation device, comprising a positioning cap, a fNIRS signal acquisition system arranged on the positioning cap, a TMS system and an analysis control device which is connected to the TMS system and the fNIRS signal acquisition system. The near-infrared signal-controlled transcranial magnetic stimulation device utilizes the near infrared signal of the subject to set personalized transcranial magnetic stimulation parameters, avoiding over stimulation or under stimulation. The near-infrared signal-controlled transcranial magnetic stimulation device is simple and easy to operate, is easy to adjust transcranial magnetic stimulation parameters according to the real-time near-infrared signal in transcranial magnetic stimulation to meet the demand of personalized treatment, enhances the stimulation effect of transcranial magnetic stimulation and expands the application scope of near-infrared signal detection, so as to provide a new method and practical tool for neuroscience research, testing and treatment.

The invention relates to the rehabilitation training field and aims to optimize the quantifying factor and scale factor of a fuzzy controller and the fuzzy control rules, then control the current mode of an FES system accurately, stably and instantly and effectively improve the accuracy and stability of the FES system. The technical scheme adopted by the invention is as follows: the walking aid electrostimulation fine control method based on genetic-ant colony fusion fuzzy controller comprises the following steps: firstly, converting the selection of fuzzy control decision variable to the combinational optimization problem adapting to the genetic-ant colony algorithm, coding the decision variable, randomly generating a chromosome composed of n-numbered individuals; secondly, using the genetic algorithm to generate the initial pheromone distribution of the ant algorithm, utilizing the ant colony algorithm to randomly search and optimize the membership function, quantifying factor and scale factor of the fuzzy controller; and performing repeated self-learning and self-regulating according to the system output, and finally using the processes in the FES system. The invention is mainly used for rehabilitation training.

The present invention relates to oxy-nitride luminescent material and its manufactured illumination and display light source. The molecular formula of oxy-nitride luminescent material is A2B5-xOxN8-x to Euy, wherein, A is alkali metal, one or a plurality of alkaline-earth metal; B is one or a plurality of 3-5 family elements contains at least Si; 0 is less than or equal to x and x is less than or equal to 1; 0.005 is less than or equal to y, and y is less than or equal to 1.0. The luminescent material is motivated by motivation light sources such as ultraviolet ray, near ultraviolet ray or blue light as LED, the high light red color light with wave length at 600 to 680 nm can be motivated. The present invention also relates to the preparation method of the oxy-nitride luminescent material. The present invention of luminescent material can make novel white light LED light source cooperated with ultraviolet ray, near ultraviolet ray or blue light LED as well as other luminescent material such as yttrium aluminum garnet type luminescent material, or can make red LED light source matched with ultraviolet ray and near ultraviolet ray.

The invention discloses an integrated device for modulating and detecting brain functions. A silicon rubber case is sleeved on the surface of a transcranial magnetic stimulation coil, an inner ring and an outer ring of the silicon rubber case are provided with a plurality of holes at different distances, near infrared transmitting and receiving probes can be conveniently inserted into the holes, the probes can be firmly held by the aid of elasticity of silicon rubber, the upper positions and the lower positions of the probes can be optionally adjusted, and close contact of the probes and the scalp of a detected portion is ensured. A miniature near infrared brain function detection device sets frequencies through a microprocessor, the frequencies are transmitted and received by a near infrared ray with a 690nm wavelength and a near infrared ray with a 830nm wavelength respectively, a plurality of LD (laser diode) / LED emitting light sources distributed at the center of the stimulation coil are sequentially lightened in a time-sharing multiplexing mode, signals detected by the surrounding probes are processed, changes of deoxyhemoglobin and blood flow are displayed on a liquid crystal display screen, and changes of the strength, the range and the depth of brain function activities corresponding to each detection channel through transcranial magnetic stimulation are reflected.

The invention discloses an LED-excited short wavelength infrared fluorescent microscopic imaging system. In the system, laser light emitted by a single-color LED passes through a collimating lens to be collimated firstly and is introduced into a light path of a microscope vertical illumination device, the exciting light is reflected with a dichroic beam combiner and converges onto a back focal plane of a microscopic objective, converging light forms parallel exciting light beams after passing through the objective and illuminates onto a sample, and a fluorescence probe in the sample is excitedto emit fluorescence; and a fluorescence signal passes through the objective, penetrates through the dichroic beam combiner and is finally received by a detection surface of an InGaAs camera to realize photoelectric conversion, and the signal is transmitted to a computer for data processing to obtain an imaged picture or a video. The LED-excited short wavelength infrared fluorescent microscopic imaging system has the remarkable advantages of high signal-to-noise ratio, high magnification, high resolution, capability of real-time imaging, capability of tomography, large penetration depth, small tissue damage and the like.

The invention relates to a single-matrix white fluorescent powder, a manufacturing method thereof and a light emitting device manufactured thereby. The chemical formula of the involved fluorescent powder is Ba(3-m-n-a)AaLu2-bRbSi3O12:mEu2+,nMn2+. The method comprises the following steps of: mixing and uniformly grinding all raw materials; roasting the mixture in reducing atmosphere at a high temperature; and performing post-processing to obtain the fluorescent powder. The fluorescent power has the characteristics of high chemical stability, super-wide excitation waveband, adjustable emission wavelength as required, high luminous intensity and the like and has the advantages of simple method, no pollution and low cost. A white LED and a warm tone light source can be manufactured by using ultraviolet light or a ultraviolet LED chip and the fluorescent powder of the invention.

The invention belongs to the technical field of building materials and particularly relates to interface mortar with an ardealite-based hydraulicity composite cementing material as a cementing material. The interface mortar is composed of ardealite, a slag powder, coal ash, metakaolin, a copper tailing slag powder, red mud, ordinary Portland cement, aluminate cement, quartz sand, a quartz powder,chesterite, calcium bentonite, a polycarboxylate-type water reducing agent, cellulose ether and latex powder. By adopting the interface mortar, the binding property of a base wall and a heat preservation layer in a wall heat preservation system can be effectively improved, the peeling risk of the heat preservation layer of a building wall can be reduced, and environment security problems caused bypiling of industrial ardealite can be also solved. When the interface mortar is produced, a great amount of industrial solid wastes such as non-calcined ardealite, coal ash, copper tailing slag powder and red mud are used, so that the interface mortar has the outstanding advantages of being low in energy consumption, low in cost, low in emission, and the like. The interface mortar is applied to heat preservation systems of various building walls, and the like.

The invention discloses a cement grinding aid and a preparation method thereof. The cement grinding aid is prepared from the following components by mass content: 5 to 10% of polyethylene glycol, 5 to10% of sorbitol, 1 to 3% of polyglycerol fatty acid ester, 5 to 10% of diethanolisopropanolamine, 5 to 10% triisopropanolamine, 1 to 5% of sodium hydroxide, 2 to 8% of sodium polyacrylate, 1 to 5% ofmicrocrystalline cellulose and the balance of water. The cement grinding aid disclosed by the invention has the beneficial effects that no matter which can affect concrete performance and building service life and has harm to human health is doped into the cement grinding aid, so that the cement grinding aid has safety and environmental friendliness; all the raw materials have a synergistic effect, so that cement fineness reduction is facilitated, reasonable particle size distribution of the cement grinding aid is guaranteed, an early hydration heat release rate of cement where mineral admixture is doped is reduced, and cement strength is improved; under the condition of guaranteeing cement strength and use, production cost can be reduced, and economical benefit and social benefit of cement production enterprises are improved.

The invention relates to a method of preparing baking-free brick with a dredge sediment aggregate, which includes the steps of (1) sieving the dredge sediment aggregate; (2) smashing cement, quick lime, gypsum and fly ash in a pulverizer; (3) material blending: mixing and stirring the cement, the quick lime, the gypsum and the fly ash to obtain a dry-mixed material, weighing the dredge sediment aggregate, wherein the dry-mixed material comprises, by mass, 5-20 parts of the cement, 3-13 parts of the quick lime, 1-10 parts of the gypsum and 15-30 parts of the fly ash, and the dredge sediment aggregate accounts for 45-70 parts by weight; (4) adding water and stirring the mixture; (5) aging the mixture material; (6) press-moulding the mixture in a brick pressing machine; (7) performing product maintenance to obtain the baking-free brick. The method can consume the dredge sediment in a large quantity, thereby achieving resource recycling. The method can satisfy requirement in dredge industry and is low in production cost due to the baking-free process. The prepared baking-free brick is low in cost, is excellent in performances, can develop a utilization approach of recycling the dredge sediment resource, and satisfies the requirement of building material market.

The invention discloses a geopolymer-based artificial flood control stone prepared from all wastes and a preparation method of the geopolymer-based artificial flood control stone. The geopolymer-basedartificial flood control stone comprises the following raw materials in parts by weight: 288-412 parts of a waste silicon-aluminum material; 85-150 parts of alkali-containing waste; 29-75 parts of waste sulfate mineral; 1501-1860 parts of recycled aggregate; 216-241 parts of reclaimed water; 0-2 parts of waste fiber; and 0-5 parts of crop waste. The process is simple, the prepared artificial flood control stone has no appearance defect; the stone has the advantages of large volume density, high strength (more than 34 MPa), good weathering resistance, freezing resistance and abrasion resistance and the like, is convenient to throw, good in integrity, strong in stability, freeze-thaw resistance, weathering resistance and high-speed sand-containing water flow abrasion resistance in the usingprocess, is not easy to lose under high-speed water flow, and is an ideal substitute product for natural stone standby stone prevention.

The invention discloses a preparation method of a water-absorbing and breathable fabric. The specific steps include: putting a cotton yarn into a detergent solution for treatment, and then conductingcleaning and air drying; putting the pretreated cotton yarn into a low temperature plasma processor for plasma treatment, then performing treatment with a post-treatment agent, and conducting cleaningand drying to obtain a modified cotton yarn; taking modified cotton yarn as the warp thread, adopting blended yarn as the weft thread, and performing interweaving to obtain a base cloth, and carryingout heat setting and finishing, thus obtaining the water-absorbing and breathable fabric. According to the invention, the preparation method increases the added value of cotton fiber yarn, has the characteristics of simplicity, convenient operation control, stable quality and high production efficiency, and is easy for large-scale industrial production. The fabric obtained by the method providedby the invention has excellent water absorption and breathability, can make the human body maintain a constant temperature and dry and comfortable state all the time. The fabric can form a unique warmkeeping system, increase the warmth retention properties, and has the advantages of no irritation to skin, soft handfeel, good gloss and strong dyeability.

The invention discloses a chip scale integration packaging process and a light emitting diode (LED) device. The packaging process sequentially comprises the following steps of: processing a surface plate substrate, fixing LED chips, coating phosphor glue to form box dam shapes, coating transparent glue to form grating plate shapes, curing the phosphor glue and the transparent glue to form box dams and grating plates, dispensing the phosphor glue in the box dam and drying the phosphor glue. The LED device comprises the surface plate bracket, wherein the surface plate bracket is divided into a central area and more than two peripheral areas outside the central area; the LED chips are fixed in the central and peripheral areas; the phosphor glue box dams are arranged on the surface plate bracket outside the peripheral areas; the grating plates formed by the transparent glue are arranged between the central and peripheral areas and between every two adjacent peripheral areas; and the phosphor glue is packaged in each area. The LED device molded by the packaging process has low optical energy loss, and emits light with uniform light color and high color rendering.

The invention relates to a processing method of instant sweet potato, comprising: deep drying the washed fresh potato to attain fried potato which has crisp on the surface and been cooked and soft inner quick frozen or directly for standby; swathing the fried potato or quick frozen potato with hot syrup decocted, separating and cooling the swathed potatoes and knocking off the sugar barbed potatoes which have been cooled; selecting the sugar covered potatoes with uniform cover and regular shape to be packed. The product of potatoes produced by this method is a kind of instant food, and be preserved in temperature after quick frozen which can be eat directly or heated. And said potato is transparent with bright luster.

The invention discloses a transcranial direct current stimulation and near infrared detection all-in-one device which comprises a near infrared brain function optical imaging system and a transcranial direct current stimulation system, wherein the near infrared brain function optical imaging system comprises a micro processor, an analog-digital converter, a first digital-analog converter, a gain programmable operational amplifier, a filtering circuit, a near infrared emission probe constant-current driving circuit, a double-waveband near infrared emission probe, a near infrared light intensity sensor probe and a liquid crystal touch screen; the transcranial direct current stimulation system comprises a micro processor, a tDCS (transcranial direct current stimulation) electrode, a current limiting device, a tDCS constant-current driving circuit, a second digital-analog converter and an upper computer; a silica gel disk is used for arranging the double-waveband near infrared emission probe, an annular electrical stimulation electrode and the near infrared light intensity sensor probe. The transcranial direct current stimulation and near infrared detection all-in-one device enhances the simulation treating effect of transcranial direct current stimulation and supplies a new method and a practical tool to scientific researches, detection and treatment of neuroscience.

The present invention relates to a method for preparing high-efficiency phosphor powder, and belongs to the field of LED inorganic light-emitting materials. The phosphor powder material has the following chemical formula: (Ca, Q) 1-y (Al, Si) 2 (N, T) 3: Ay, wherein Q including Li, Mg, Sr, Ba, Zn and Be, T comprises C, O , F, Cl and Br, A is an emission center element, and 0 <y<=0.5. The phosphor powder uses a porous halide as a fluxing agent, and the formula is MRb, wherein M includes Li, Na, K, Mg, Ca, Sr, Ba, Al, Eu, and NH4 +, R comprises F, Cl and Br, and 1<= b<=3. The method is capable of reducing single-phase (Ca, Q) 1-y (Al, Si) 2 (N, T) 3: Ay nitride generation temperature, crystallinity and morphology are improved to facilitate light absorption and transmitting, and light conversion efficiency of nitride red powder is improved.

The invention discloses a technology for preparing baking-free bricks with iron tailing-secondary aluminum ash-acid leaching magnesium residues. The iron tailings, aggregate river sand and gel materials are mixed with the pretreatment secondary aluminum ash and quick lime pretreatment acid leaching magnesium residues, uniform stirring is conducted, mixing water is added for pre-activation, then anadditive is added, stirring is conducted in advance, wheel-grinding mixing is performed, final stirring is conducted, after ageing, the mixture is injected into a forming mold, forming pressure is set, by the adoption of staged pressurizing, the mixture is pressed to be formed under constant pressure, and after steam curing maintaining is conducted in an autoclave, the baking-free bricks are obtained through natural maintaining. Quick lime is adopted for pretreating acid leaching magnesium residues and added into the acid leaching magnesium residues to form an alkaline environment, under alkaline conditions, part of heavy metal ions precipitate, meanwhile, a good adsorption effect on ammonium radical ions is realized, pollution of ammonium radical degradation to air is prevented, and a good excitation effect on acid leaching spiegel residues is realized; the active performance of the magnesium residues is excited, and after gel substances and aggregate are added for uniform mixing andstirring, the baking-free bricks are prepared through the method of pressing forming.

The invention discloses LED nitride fluorescent powder and a preparation method thereof. The chemical structural formula of the LED nitride fluorescent powder is LaXbZcNd: rR, wherein L is at least one of Ca, Sr and Ba; X is at least one of B, Al, Ga, In and Tl, wherein Al is necessary; Z is at least one of C, Si and Ge, wherein Si is necessary; R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, wherein Eu is necessary; and (a + r): b: c: d is equal to 1: 1: 1: 3. The preparation method is as follows: weighing raw materials according to the composition of the chemical formula of the fluorescent powder and the stoichiometric ratio, adding an activator, uniformly mixing in a glove box, sealing, then adopting the normal-pressure high-temperature solid-state method for carrying out multiple roasting under the protection atmosphere, and carrying out post-treatment for obtaining the LED nitride fluorescent powder. The luminescent material is characterized by good chemical stability, high luminescence efficiency and the like, and the manufacturing method is simple, pollution-free and low in cost.