227results about How to "Breach of integrity" patented technology

The invention discloses a voice switching method and device, computer equipment and a storage medium. The method comprises steps that a voice file is obtained for preprocessing to obtain audio data; the audio data is normalized, the audio data is framed, and frame energy of each voice frame is calculated; if the frame energy of the voice frame is less than the preset frame energy threshold, the voice frame is marked as a silence frame; if that the number of consecutive silence frames is greater than the preset silence frame number threshold is detected, the consecutive silence frames are marked as a silent segment; segmentation frames of the voice file are determined based on the silence segment, the voice file is segmented through utilizing the segmentation frames, and a target file is obtained. The method is advantaged in that the frame energy is utilized as a segmentation criterion for voice segmentation, no manual intervention is required, complexity is low, silence and pauses in statements can be accurately identified, and segmentation efficiency is effectively improved while the voice file is accurately segmented.

The invention discloses a Hadoop-based distributed intrusion detection system which comprises a data acquisition module, a data storage module, a control center and a data analysis module, wherein the control center comprises a system management module, a system monitor module, a task scheduling module and an alarm response module. By utilizing a Hadoop-based distributed computation framework, the system is allowed to have good interoperability, and the system reliability is improved; the system carries out data parallel acquisition through a distributed mode, thereby improving data acquisition capability and reducing packet loss probability; in an algorithm adopted in the system, data is allocated according to capacity and load of nodes, and adjustment is carried out by utilizing a dynamic load balancing strategy, so that data processing capacity of the nodes is given effective play to, and load balancing of the system is maintained; and through the algorithm, the case of distributing the data comprising the same attack to two or more detection nodes for processing separately, which damages integrity of the data, is prevented, and detection efficiency is improved effectively.

The invention discloses a pomegranate-like structured composite material preparation method which comprises the following steps: S1, taking a polyacrylonitrile solution, adding silica nanoparticles, and fully dispersing; S2, adding deionized water after stirring for emulsification to obtain a mud like precursor; S3, heating the mud like precursor obtained in the S2, and annealing to obtain a solid composite; and S4, grinding the solid composite obtained in the S3 into micron particles, adding a hydrogen fluoride solution for corrosion for a certain period of time, washing hydrogen fluoride, and drying to obtain a pomegranate-like structured composite material. According to the method, polyacrylonitrile is used for coating the silica particle surface, the polyacrylonitrile is emulsified when meeting water, so that the coated silicon particles are agglomerated, the coated silicon particles are carbonized and ground for formation of the pomegranate shaped structured silicon carbon composite material, HF is used for direct corrosion of the silicon nanoparticles in the material for preparation of the hollow pomegranate-like structured composite material, and detailed structure characterization and electrochemical performance testing of the material show that the material is good in performances.

The invention relates to a water glass modifying additive for casting and a production process and a using method thereof. The modifying additive consists of the following components in percentage by mass: 40 to 65 percent of styrene-acrylate emulsion, 0 to 10 percent of urea resin, 0.1 to 0.5 percent of quaternary ammonium salt and 25 to 55 percent of water. Used water glass sand is subjected to dry reclamation, the residual Na2O content of the used sand is controlled in a certain range and the water galls with ultra-low modulus is matched with the modifying additive so that the available time for preparing molding sand by mixing all or partial reclaimed sand can be prolonged and the molding sand has good process performance; and the reclamation rate of the used water glass sand can reach over 85 percent. The water glass modifying additive is directly added into the water glass at normal temperature and stirred uniformly without a fussy heating-cooling process so as to facilitate the operation on a molding site.

The invention discloses a gob-side entry driving surrounding rock control method using remaining small pillars. The method includes: distributing blast holes of different angles and depths in a working face conveying chute during extraction on an upper region working face, preforming a weak face in a certain area of a basic roof to damage completeness of a basic roof rock stratum by deep hole presplitting, and allowing a suspension arch of the basic roof to break at predetermined positions under the action of roof pressure after extraction of the working face. Therefore, the length of the hanging arch of the lateral basic roof of a gob is shortened, gob lateral abutment pressure is reduced, roadway pressure is relieved during gob-side entry driving in a lower region using remaining small pillars, and maintenance of a roadway is facilitated.

The invention relates to a gas extraction method for parallel hole arrangement of an L-shaped drilling and fracturing weakening top plate. The gas extraction method comprises the following steps: firstly, determining drilling positions and selecting drilling parameters on the ground corresponding to a working face of a coal mining seam; secondly, performing L-shaped fracturing drilling and L-shaped gas extraction drilling construction; thirdly, after the L-shaped fracturing drilling construction is finished, arranging a casing pipe and fracturing equipment in an L-shaped drilling hole; fourthly, after the L-shaped gas extraction drilling construction is finished, arranging a gas extraction pipe with air holes in L-shaped gas extraction drilling hole; fifthly, performing fracturing in advance on a coal seam top plate by using a hydraulic jet staged fracturing method; sixthly, extracting fissure zone gas by the gas extraction pipe while performing coal mining operation. According to the scheme, the problems of high mine pressure behavior and transfinite fissure zone gas in a goaf in a coal mining process in the prior art are solved.

The invention discloses an environment-friendly high-strength water-resisting and mildew-resisting adhesive for a plywood and a preparation method of the environment-friendly high-strength water-resisting and mildew-resisting adhesive. The environment-friendly high-strength water-resisting and mildew-resisting adhesive is prepared from the following raw materials including polyvinyl alcohol, cassava starch, dibutyl phthalate, sodium pyrosulfite, tannic acid, jade powder, calcium silicate hydrate, asbestos powder, p-hydroxybenzoic acid hydrazide, diammonium hydrogen phosphate, hydroquinone, sodium diethylhexyl sulfosuccinate, triethyltin chloride, phenyl mercury oleate, borax and the like. The polyvinyl alcohol and the cassava starch are subjected to a cross-linking reaction so that crystallization degrees of the polyvinyl alcohol and the cassava starch are reduced and a new cross-linking structure is formed, and furthermore, the thermal stability of the adhesive is improved; the borax is added and the polyvinyl alcohol and the starch can be subjected to further cross linking, so that the cross-linking degree and the initial viscosity of the adhesive are improved, and furthermore, the water resistance and the bonding force of the adhesive can be improved; the triethyltin chloride, the phenyl mercury oleate, the p-hydroxybenzoic acid hydrazide and the like are added so that the mildew-resisting capability of the plywood can be improved.

The invention provides a piglet feed. The piglet feed comprises the following components in percentage by weight: 20 to 40 percent of expanded corn, 4 to 10 percent of expanded bean pulp, and 5 to 12 percent of enzymolyzed bean pulp. The invention also provides a method for preparing the piglet feed. The formula of the piglet feed is reasonable; and the expanded corn, the expanded bean pulp and the enzymolyzed bean pulp which are added can effectively improve the digestive function of intestines and stomachs of piglets, eliminate various antinutritional factors, ensure that the piglets ingestbalanced nutrition, improve the digestive efficiency of the intestines and stomachs and the weight growth rate of the piglets, reduce the diarrhea rate of the piglets, and improve the growth quality of the piglets.

The invention discloses a defective pixel detecting and correcting method based on minimal mid-value gradient filtering. The method comprises the steps that a 5*5 Bayer array uses a pixel to be detected as the center, a center pixel is used as the datum, three gradient absolute values are calculated in the horizontal direction, the vertical direction, the diagonal direction and the clinodiagonal direction, the mid-value of the gradient absolute values in each direction is gained, and then the minimum value of the four mid-values is obtained to be used as the edge direction, namely the defective pixel checkout direction; in the minimum mid-value gradient direction, a defective pixel can be obtained when the requirement that the middle gradient absolute value is larger than the value which is integer multiples of the sum of the other two gradient absolute values in the same direction is met, the pixel value in the direction is used for verification, and otherwise, the pixel is a normal pixel and is output directly; for certain special range pixels, a more strict judgment condition is used for reducing missing inspection at edge pixels; for the diagonal position or the back-diagonal position, a more loose judgment condition is used for reducing missing inspection at the edge position when the gradient meets certain conditions. By means of the defective pixel detecting and correcting method based on minimal mid-value gradient filtering, the defective pixel can be filtered out quickly, the false detection rate and the missing detection rate are low, and image borders can be completely reserved.

The invention relates to a rapid preparation method for a MSi2O2N2:Eu<2+> phosphor. The rapid preparation method comprise the following steps of (1) weighing raw materials of silicon oxide, silicon nitride, alkaline earth oxide and europium oxide according to a molar ratio and in terms of the chemical formula M1-xSi2O2N2:Eux<2+>, then mixing the raw materials uniformly, and obtaining uniformly mixed raw material mixed powder; (2) putting the raw material mixed powder into a graphite die, directly applying a strong current to the upper and lower ends of the graphite die and heating to a temperature in a range from 1400 DEG C to 1550 DEG C in a protective atmosphere, maintaining the temperature for 0-20 min and cooling naturally, and obtaining the MSi2O2N2:Eu<2+> phosphor. The rapid preparation method is advantaged by fast heating rate, short holding time, and high conversion efficiency of phosphor synthesis, the synthetic phosphor need not be broken into pieces, the synthetic MSi2O2N2:Eu<2+> phosphor has a wide excitation wavelength range, has high emitted light intensity, and can be effectively excited by ultraviolet and blue light LED chips.

The invention provides an underground gas storage safe operation monitoring system and monitoring method. The underground gas storage safe operation monitoring system comprises armored optical cables,quasi-distributed optical fiber pressure sensors and underground three-component detector arrays, wherein the armored optical cables and the quasi-distributed optical fiber pressure sensors are distributed inside and outside all gas injection wells, gas production wells and monitoring well sleeves and outside in-well gas injection and production pipes, and the underground three-component detectorarrays are partially distributed in a monitoring well. The measurement armored optical cables, the quasi-distributed optical fiber pressure sensors and a composite modulation and demodulation instrument placed near a wellhead are fixed to the outer side of the metal sleeve. According to the underground gas storage safe operation monitoring system, real-time on-line monitoring of changes of noise,temperature, pressure, stress / strain and distribution characteristics of microseism events in all wells is comprehensively and fully utilized, intelligent comprehensive analysis and evaluation are carried out on all parameters and information monitored in real time on line, grading classification is carried out on various risks or accidents influencing safe and stable operation of the gas storage, early warning signals and information of accident risks are issued in time, and long-term stable and safe operation of the gas storage is ensured.

The invention discloses a hard roof orientation acidification fracturing roof control pressure relief method which includes the steps: determining a fracturing target layer, particularly determining afracturing hard difficult caving roof layer position, and acquiring the reasonable fracturing target layer according to the hard difficult caving roof layer position and natures of rock layers; arranging an acidification fracturing roadway; arranging a fracturing hole, a guide hole and a wedge-shaped groove; connecting acidification fracturing systems, and performing acidification fracturing. According to the method, acidification fracturing of a hard roof is controlled, the strength of a rock is weakened, mechanical properties of the rock are reduced, the integrity of the hard roof is destroyed, local stress concentration is effectively removed, and goaf roofs can be timely collapsed in a layered and batched manner. The method avoids a series of mine dynamic disasters which include thatstrong mine pressure of a high stress area of a coal column and strong mine pressure along a caving roadway are appeared as large-area hard roofs of working areas cannot be timely collapsed. The method is obvious in effect and has wide practicability.

The invention discloses a fixed part composite filter rod. Multiple fixed parts which are formed in advance and multiple other cigarette filter rod small segments are arrayed at intervals, forming paper wraps outer circles, the fixed parts are provided with shells which are cylindrical or similar to cylinders and sealing covers with holes at two ends, and spice or functional parts of which colors / forms can be changed by smoke temperature in smoking are arranged in the fixed parts. The fixed part composite filter rod can be divided into composite filter tips with the fixed parts. According to the fixed part composite filter rod, the smoke flavor can be improved, the smoke temperature can be lowered, and the audio visual effect can be improved through a special design.

The invention discloses a radio frequency identification tag and a manufacturing method thereof. The radio frequency identification tag comprises a face layer, a thermal contraction layer, a release layer, a fragile radio frequency identification layer and an adhesive layer, wherein the face layer, the thermal contraction layer, the release layer, the fragile radio frequency identification layer and the adhesive layer are sequentially and mutually composite. The thermal contraction layer is made of thermal contraction polyvinylchloride, thermal contraction polyethylene glycol terephthalate, thermal contraction polyethylene, multi-layer coextrusion polyolefin, directional polystyrene, thermal contraction polypropylene or thermal contraction biaxially oriented polypropylene. Due to the thermal contraction layer, the radio frequency identification tag can be prevented from being recycled again; due to the release layer contained in the tag, when the tag is torn off, the fragile radio frequency identification layer can be separated from the face layer and the contraction layer and is left on the surface of an adherend, integrity of the tag is broken and the effect of preventing the tag from being recycled is achieved.

The invention relates to a piglet puffed compound feed and a preparation method thereof. The piglet puffed compound feed is characterized in that corns, bean pulp, enzymolysis bean pulp, fish meal, whey powder, acyl-hydroxylated emulsified oil powder, calcium hydrophosphate, zeolite powder, enzymic preparations, xylanases, citric acid, lysine and a pre-mixing material are contained in raw materials. After the raw materials are treated at a high temperature and high pressure in a puffing cavity, multiple harmful bacteria are killed; the starch is pasted, so that the defect that the starch cannot be fully utilized by a weaned piglet is overcome to a certain extent while the generation of lactic acid in the gastrointestinal tracts of the weaned piglet is stimulated. After the raw materials are puffed, the antigen activity of beans is lost, so that the stimulation to digestive tracts and especially to intestinal villi is avoided. Based on the puffed treatment, the utilization ratio of protein and prandial fibers are improved, so that the absorption utilization rate of the piglet to the feed is improved; the durchfall and diarrhea of the piglet are reduced; the immunity of the piglet is enhanced. Thus, the daily gain and feed conversion ratio of the piglet are improved effectively.

The invention relates to an arrangement method for a precracking roof for a roof-cutting roadway, and is particularly suitable for precracking the roof of a working face with a thick and hard roof, so as to prevent the roof from forming a large area of hanging arch at the back of the working face and further prevent coal from generating high stress to collectively cause an rock burst disaster. A roadway is tunneled where roof precracking is needed; a crossheading on the side where a goaf is positioned of the working face is communicated with a gas high collection tunnel, and the tunneled roadway is called the roof-cutting roadway; and a hole as large as the roadway is formed in the thick and hard roof of the roof-cutting roadway, so that the intensity of the roof is weakened. When the working face advances to the area of the roof-cutting roadway, the roof is broken along the precracking weakened area of the roof-cutting roadway so as to prevent the thick and hard roof from forming a large area of hanging arch at the back of the working face and further prevent the hanging arch from causing coal in front of the working face to generate high stress and collectively cause an rock burst disaster. In addition, explosion is not required when the roof is precracked with the method, so as to avoid a gas explosion disaster of a well caused by sparks of the explosion. The method has the advantages of simplicity, safety, practicality and good roof-cutting effect.

The invention discloses a gas-containing coal permeation-increasing method adopting joint action of carbon dioxide detonation and acidification. According to working face parameters, the coal seam thickness, the gas content and the like, the drilling hole arranging mode of a permeation-increasing unit is comprehensively confirmed, and a plurality of permeation-increasing units are arranged on a working face; and drilling holes in the permeation-increasing unit are adopted with the following measures that firstly, carbon dioxide detonation is conducted through a detonation hole, then acid liquid is injected through an acidification hole, the setting time is maintained, and finally, the detonation hole and the acidification hole are connected into an extraction system to conduct gas extraction. According to the permeation-increasing method of the coals containing the gas through the joint action of detonation and acidification of the carbon dioxide, while coal seam breathability is increased, the content of the carbon dioxide is greatly improved through early carbon dioxide detonation and later-period acidification, and additionally, the adsorption capacity of the coals on the carbon dioxide is further larger than that of methane, so that the replacement and displacement effects on the methane are achieved. According to the gas-containing coal permeation-increasing method adopting the joint action of carbon dioxide detonation and acidification, through sufficient combination of the advantages of carbon dioxide detonation and acidification, coal seam breathability is greatly improved, and the gas extraction rate is improved.

The invention discloses a data processing device, and a virtual currency mining machine and a computer server applying the data processing technology. A first operation chip and a second operation chip powered by a core voltage in a layered manner are arranged on the surface of the same side of a PCB through series connection and have different packages, so that the PCB has fewer wiring layers, and the damage to the integrity of metal foil by signal lines or the crossover between signal lines can be avoided through reverse arrangement of the signal communication pins used in different packages. Core power supply does not require an additional switching power supply. The reduction of the wiring layers of the PCB helps to reduce the cost. As the damage to the integrity of metal foil by signal lines or the crossover between signal lines is avoided, the reliability can be improved. According to the embodiment, the PCB can carry a large number of operation chips under the premise of low cost and high reliability.

The invention discloses a treatment method applied to disaster of a steeply dipping seam roof and belongs to the technical field of safe production process of coal mining. The treatment method applied to disaster of the steeply dipping seam roof is capable of effectively ensuring the safety of mechanical mining under the condition of the oblique coal seam hard roof and greatly reducing the coal mining risk under such condition. The treatment method comprises the following steps: weakening and exploding a pull trough of a roof in a cutting hole of a coal mining layer of a working surface; weakening and exploding the roof of the roof of the coal mining layer of the working surface in advance according to a certain step pitch along the trough through an air returning roadway and a transportation roadway; exploding a roof at a corner of the tail roadway of the air returning roadway of the working surface, and so on, and repeating the corresponding steps according to the coal mining progress in accordance with the step pitch till the roof of the coal mining layer of the whole working surface is weakened and removed, thereby completing the treatment on the disaster of one steeply dipping seam roof.

The present invention discloses a non-precious metal sulfide type supported catalyst. In the catalyst, at least one of molybdenum or tungsten, and at least one of cobalt or nickel are supported on a carrier in a wholly or partially sulfide state; the carrier comprises a carbon material; the mass of at least one of molybdenum or tungsten is 10 to 50% of the total mass of the catalyst, the mass of at least one of cobalt or nickel is 1 to 20% of the total mass of the catalyst, and the mass of the carrier is 1 to 20% of the total mass of the catalyst. The invention also discloses a preparation method and use of the catalyst. Compared with the prior art, the catalyst of the invention has high active component content, more active sites and exposed sites, and active components are uniformly dispersed on the carbon material, and when the catalyst is used for preparing high-heat-stability fuel, the catalyst has high hydrodesulfurization activity and aromatic saturation activity.

The invention discloses a preparation method of a natural soft tissue decellularization matrix. The method includes material taking, pretreatment, disinfection, degreasing, enzyme treatment, decellularization, rinsing and sterilization. The method has the advantages of being high in decellularization efficiency, small in damage of matrix components, low in immunogenicity of the decellularization matrix, and good in biocompatibility.

The invention discloses a metal roof secondary waterproof structure and a construction method. The metal roof secondary waterproof structure comprises a roof layer (1), a cavity layer (2), a secondary waterproof layer (3), a gutter (4), a main steel structure (5) and a stand column purlin hanger (6). The cavity layer (2) is located between the roof layer (1) and the secondary waterproof layer (3). The stand column purlin hanger (6) is supported on the main steel structure (5) for supporting the roof layer (1) and the secondary waterproof layer (3). The waterproof structure can prevent the phenomenon that the integrity of a coiled material is damaged by an aluminum alloy support needed by installing a metal panel, and further improves the waterproof performance of the metal roof, and the cavity layer, a heat preservation layer, a sound absorption layer and a steam isolation layer are arranged in the roof structure, so that the waterproof structure has the good sound-insulating, heat-preserving and damp-proof effects.

The invention discloses a compound air filter membrane based on chitosan and graphene oxide and a preparation method of the compound air filter membrane. The filter membrane takes a sponge carbon membrane as a substrate, chitosan and graphene oxide are compounded on the sponge carbon membrane, and conjugated bonds and large Pi bonds in chitosan and graphene oxide have relatively strong Pi-Pi accumulative interaction, so that chitosan and graphene oxide can be firmly compounded on the surface of the sponge carbon membrane without the presence of an adhesive; the surfaces of chitosan and graphene oxide have relatively strong static charges, so that solid particle pollution in the air can be adsorbed through a static adsorption effect; meanwhile, due to the presence of graphene oxide, surface micro-structures appear as micro-pores and folds of 0.1-0.8mu m, so that solid particles, including fungi, bacteria, viruses and the like, can be quickly adsorbed; and because graphene oxide has a relatively large specific surface area and has relatively strong interaction with organic pollution gas, graphene oxide has very high adsorption and suction capabilities for organic pollution gas.

The invention discloses a functional composition containing plant bacterium-inhibiting polypeptide as well as a preparation method and application thereof. The composition is prepared from the following components: a bacillus fermentation product, leuconostoc / radish root fermentation product filtrate, octyl hydroxamic acid and 1,2-hexanediol. Antibacterial peptide and polyol are matched accordingto different antibacterial spectrums to be used as bacterium-inhibiting components, and replace or partially replace a traditional chemically-synthesized preservative; a preservative-free system of anaddition-free preservative-free concept can be completely supported; the functional composition has moderate properties, no irritation and no toxic and side effects, and lower allergy; the functionalcomposition helps to keep ecological health and balance of skin, so that the safety of a biological preparation is improved. The bacterium-inhibiting components have good compatibility with most materials, the bacterium-inhibiting capability is not influenced by other materials and the stability of a preparation is not influenced; meanwhile, the functional composition has better experience in theaspects of moistening feeling, comfort degree and skin brightness.

The invention discloses a non-contact temperature measurement device for an induction cooker. A thermal imager supporting panel capable of moving up and down along a bracket is arranged in the bracket. An infrared thermal imager is arranged in the center of the thermal imager supporting panel. Two guide rails are fixed on the two sides of the upper part of the bracket respectively, and the extended ends of the two guide rails are supported by angle iron respectively. An induction cooker supporting panel is arranged on the two guide rails, and can slide in an X direction along the guide rails. A cookware supporting panel is fixed on the bracket, and is positioned above the induction cooker, and the center of the cookware supporting panel is provided with a through hole. Cookware is arranged in the through hole of the cookware supporting panel. The center of the bottom surface of the cookware is collinear with the center of a lens of the infrared thermal imager. The infrared thermal imager is connected with a computer. The non-contact temperature measurement device for the induction cooker is not required to damage the integrity of the induction cooker, can measure the average temperature of the bottom of the whole cookware in real time to more intuitively reflect the temperature condition of the cookware compared with conventional contact point temperature measurement, avoids temperature measurement time lag caused by a ceramic panel and improves the temperature measurement accuracy.

The invention discloses controlled-release recombinant human bone morphogenic protein-2 poly-L-lactic acid microspheres and a preparation method thereof, which relate to a medicament carrier and preparation thereof. The component of a microsphere substrate is poly-L-lactic acid (PLLA); the wrapped medicament is recombinant human bone morphogenic protein-2 (rhBMP-2); and the released rhBMP-2 active protein is integral in structure and exists in a form of a homologous dipolymer. The preparation method comprises the following steps: mixing rhBMP-2 organic solution and PLLA organic solution to obtain mixed solution; precipitating microsphere crystals from the mixed solution after the mixed solution passes through a supercritical fluid CO2 solvent extraction; and after obtaining the microspheres, stopping pumping the mixed solution, keeping a pressure and a temperature in a high pressure autoclave unchanged, and continuously introducing CO2 to elute the microsphere crystals to remove residual organic solution. The method of the invention is simple in process, short in period, easy in organic solution removal, high in biological safety, short in burst releasing period and long in obtained microsphere particle controlled-release period, and easier in the storage of the physiological activity of the rhBMP-2.

The invention provides a mussel byssus removal method which comprises the following steps: soaking mussels in hot water at the temperature of 60-70 DEG C, and feeding the mussels in a byssus removal device for removing the byssus while preserving the temperature of the mussels to be over 50 DEG C. The mussel byssus removal device provided by the invention comprises an inclined conveyer belt [8], wherein part of the feeding end [2] of the conveyer belt is arranged in a blanching device [1]; the blanching device is provided with a box body [7], a water supply pipeline [16], a steam pipeline [15] and a water temperature control device, and the water level is higher than the feeding end of the conveyer belt; the discharging end of the conveyer belt is arranged above a feeding position of the byssus removal device [11]; the part, outside the blanching device, of the conveyer belt and the periphery of the byssus removal device are coated with a shell. Compared with the prior art, the mussels are heated firstly during byssus removal, so that the byssus is separated from shellfish meat; in the byssus removal device, the byssus can be separated from the shellfish meat only by using bristles, so the byssus removal rate is over 90 percent. Therefore, the shellfish meat completeness rate is over 95 percent.

The invention discloses a secure deletion method for data in a solid-state disk on the basis of a flash memory. The characteristic that multiple data channels in the solid-state disk can be operated in parallel is utilized, an improved secrete sharing scheme is adopted to conduct conversion processing on data, and encoded data is distributed to all the data channels; on one hand, data redundancy is guaranteed through encoding, the converted data is ciphertext, and the reliability and the security of the data are improved; on the other hand, the error-resilient encoding characteristic is utilized, covering on the whole data is not needed any more for deletion of the data, partial data is deleted, the data integrity is destroyed, and the data cannot be recovered. Even though an attacker obtains partial encoded data, the attacker cannot obtain plaintext, and the purpose of securely deleting the data is achieved. By means of the secure deletion method for the data in the solid-state disk on the basis of the flash memory, the data storage security problems that storage of the solid-state disk is unreliable, and files cannot be deleted securely are solved.

The invention relates to the field of chemistry and preparations, in particular to an unsaturated cationic lipid derivative, a preparation method thereof, and application in a plasmid delivery system.The cationic lipid takes electropositive lysine as a hydrophilic head group, amino acid as a skeleton and an unsaturated alkane chain as a hydrophobic tail chain, so that the cationic lipid has the advantages of good biocompatibility, high safety and the like. The synthesis method is simple and quick, low in synthesis cost and beneficial to large-scale production. The cationic liposome constructed on the basis of the unsaturated cationic lipid designed by the invention can stabilize the load plasmid without leakage, has better gene transfection efficiency on various tumor cells and primary cells than positive control Liponectamine2000, and has no obvious cytotoxic effect on cells. The invention provides a safe and efficient cationic lipid and non-viral vector platform for plasmid delivery.

The invention discloses a method for drying gastrodia elata at variable temperatures, and belongs to the technical field of primarily processing medicinal plants. By the aid of the method, the drying time can be shortened, and the gastrodin contents can be increased. The method includes steps of steaming the fresh gastrodia elata; cooling the steamed gastrodia elata at the room temperatures; preliminarily freezing the gastrodia elata; carrying out vacuum freeze-drying on the gastrodia elata to obtain dried gastrodia elata. Compared with the traditional process for carrying out vacuum freeze-drying on gastrodia elata, the method has the advantages that the fresh gastrodia elata is steamed and cooked before being preliminarily frozen, accordingly, transformation and synthesis of gastrodin can be accelerated by the aid of the method, and the gastrodin contents of the dried gastrodia elata can be 1.75 times the gastrodin contents of directly frozen and dried gastrodia elata; the integrity of gastrodia elata cells is destroyed in steaming procedures, free water and partial combined water are easy to diffuse to the outsides of the cells and tissue spaces, accordingly, the duration for drying the gastrodia elata by the aid of the method can be saved by 5 hours at least as compared with a process for directly carrying out vacuum freeze-drying on fresh gastrodia elata, and energy sources can be saved; the original appearance of the fresh gastrodia elata dried by the aid of the method can be kept, the gastrodia elata is good in rehydration capacity, easy to smash and long in shelf life, and the method is high in operability and easy to popularize.