88results about How to "Easy speed control" patented technology

The invention provides a sulfur serial compound phase-change material ceria chemical mechanical polishing liquid which, bases on the total weight of the polishing liquid, comprises 0.01-5wt percent of oxidant, 0.01-4wt percent of surfactant, 0.01-3wt percent of organic additive, 0.2-30wt percent of ceria polishing particle and pH regulator and water medium. The polishing liquid is mainly applied to the CMP process of the sulfur serial compound phase-change material GexSbyTe(1-x-y). With the provided ceria chemical mechanical polishing liquid, the polishing rate of the phase-change material GexSbyTe(1-x-y) can be controlled at 5-1500nm / min, simultaneously, the surface roughness is lowered below 7.4. As the polishing of the polishing liquid on the phase-change material GexSbyTe(1-x-y) has the advantages of controllable rate, low surface damage and residue-free performance, the requirement of CMP process for preparing a nano-electronic phase-change memory can be satisfied.

The invention discloses a testing device and a testing method for mechanical parameters of a non-standard rock test piece. The testing device comprises a hydraulic pressure testing machine used for loading, a test piece clamping device matched with the pressure testing machine for use, as well as upper and lower loading cones, wherein the structure of the test piece clamping device is as follows: a cushion column with adjustable height is arranged on a center shaft of a column head of a hydraulic oil cylinder of the hydraulic pressure testing machine, a cushion plate is arranged on the cushion column, left and right longitudinal rods which can be vertically adjusted are symmetrically arranged at two ends of the cushion plate, horizontal rods which can be horizontally pushed and pulled are respectively arranged at symmetrical positions on the left and right longitudinal rods, the inner end heads of the two horizontal rods are respectively provided with an arc-shaped elastic clamping pad, and the arcs of the two clamping pads are required to correspond to each other. According to the testing device and the testing method, tests for mechanical properties of rock can be directly carried out on test pieces adopted on site indoors by utilizing the pressure testing machine and the clamping device with the radial clamping function, so that the accuracy of test results is significantly improved, and the purpose of safe tests is achieved as personal injury accidents also cannot occur.

The invention relates to an acicular nano hydroxyapatite material of good absorption capability. The absorption content of lysozgme with different concentration (0.2mg / ml-1.0mg / ml) of the material is 2.14 percent to 19.06 percent, with the highest absorption rate of 95 percent above. The slow-release property of the material is controllable with the slow-release time being controlled between 60min and 960min, while the slow-release rate can be controlled between 60 percent and 95 percent. The release speed of the material can be adjusted by changing the type and pH value of desorption solution. The weak crystallizing hydroxyapatite takes a calcic compound and phosphorus compound solution as a raw material which goes through processes of dropping, reaction, ethanol decentralization, stirring or aging at room temperature, and then the material is prepared. The particle diameter of the hydroxyapatite prepared is at a nano level and distributed evenly and the particles thereof are characterized by low crystallinity, large specific surface area, high surface activity and the like. The adsorption of the lysozgme is completed by selecting a phosphate buffer solution with pH being equal to 7.3, based on the electrostatic interaction, and is characterized by short adsorption time and large adsorption quantity. The acicular nano hydroxyapatite material has the advantages of easily available raw materials, low cost and simple operation and the material obtained has good adsorbability and controllable slow-release property, thus the material can be used as a slow-release carrier of basic proteins such as lysozgme, etc.

The embodiment of the invention discloses a silicon heterojunction solar cell with an electroplating electrode and a manufacturing method thereof. The method comprises the steps that a metal seed layer is formed on the surface, where a grid needs to be manufactured, of a cell substrate; a silk-screen printing ink process is used for forming an ink grid line groove pattern on the surface of the metal seed layer; after a preset time interval, the ink grid line groove pattern is cured; the ink grid line groove pattern is used as a mask film, an electroplating process is used for depositing a composite metal layer; the ink grid line groove pattern and the part, which is not in contact with the composite metal layer, of the metal seed layer is removed. The implementation mode for forming the ink grid line groove pattern by the silk-screen printing ink process is simple and controllable, moreover, ink can be removed easily, and the manufacturing technology is simple. In the curing process, the ink can be evenly expanded and deformed, the width of an opening of the obtained ink grid line groove pattern is small, the depth-width ratio of a formed metal grid line is large, the light shading area is small, and the efficiency of the silicon heterojunction solar cell with the electroplating electrode is improved.

The invention provides sericin-alginate compounded hydrogel and a preparation method thereof. The method comprises the steps that 1, silkworm cocoons of bombyx mori silk fibroin deletion type mutation varieties are weighed, extraction is carried out with LiBr or LiCl water solution, dialysis and purification are carried out, concentration is carried out, and a nondegradable sericin water solution with the mass percentage concentration being 1.5% to 10% is obtained; 2, an alginate water solution with the mass percentage concentration being 0.1% to 10% is prepared; 3, in the presence of a cross-linking agent, the sericin water solution and the alginate water solution are mixed in the proportion of (100-0.01):1, and the sericin-alginate compounded hydrogel is prepared, wherein the cross-linking agent comprises an ionic cross-linking agent and / or a covalent cross-linking agent. According to the scheme, the sericin-alginate compounded hydrogel of an interpenetrating polymer network can be obtained, the obtained compounded hydrogel has excellent fluorescence characteristics, deformation memorability and elasticity modulus adjustability and further has good biocompatibility and cell adhesion, and survival, proliferation and migration can be supported for a long time.

The invention relates to a device for preparing hydrogen through hydrolysis and belongs to the technical field of hydrogen preparation. The device comprises a storage tank, a reactor, a condenser and a drier and is characterized in that the storage tank is used for storing solid reactant and connected to a driving mechanism; the driving mechanism is communicated with a hydrolysis reactor provided with a hydrogen outlet; and the hydrogen outlet is provided with a pipeline sequentially communicated with the condenser and the drier. The device of the invention has the advantages of simple structure, rapid hydrogen preparation, controllable rate, high hydrogen purity, low pollution level, low manufacturing cost, high safety and reliability, good controllability wide applicable range, convenient popularization and application and the like.

The invention discloses a concrete beam flexure testing device. The concrete beam flexure testing device comprises four steel rods, a first steel plate, a second steel plate, a third steel plate, a servo controller, a motor, a planetary reducer, a ball screw lifter, a force sensor, a first displacement sensor, a second displacement sensor, a third displacement sensor, a fourth displacement sensor, a static data acquisition instrument, a first support, a second support, an organic glass panel and a high-definition camera; the concrete beam flexure testing device can be used for performing three-point beam bending testing and four-point beam bending testing; a displacement control loading mode is adopted to achieve stable and controllable speed rate with large choosing range, and the softening character of the concrete beam can be captured; the data acquisition system adopts the force sensor and the displacement sensors to achieve high data measurement precision, and the static data acquisition instrument is utilized to acquire data, so that the concrete beam cracking process can be completely recorded; the high-definition camera is adopted to record the concrete beam crack growth process, accurately observe the strain localization phenomenon and obtain cracking strain.

The invention relates to an amino thermochemical high-temperature energy storage method, which includes using the amino thermochemical reversible reaction 2NH3+△HN2+3H2 to store energy through conversion of thermal energy and chemical energy; when heated by solar thermal energy, high-temperature thermal energy, waste heat or waste heat , the liquid NH3 in the amino endothermic reactor undergoes an endothermic decomposition reaction under the action of a catalyst and high pressure, and the received heat is stored in the gaseous decomposition products N2 and H2 in the form of chemical energy; when heat is needed, N2 and H2 Input into the exothermic reactor, under the action of catalyst and high pressure, a reverse thermochemical reaction occurs, and the chemical energy stored in N2 and H2 is reversed into high-grade heat and released. The invention also relates to devices used in said method.

The invention discloses a chemical mechanical polishing liquid for titanium. Based on the total mass, the chemical mechanical polishing liquid for titanium comprises the following raw material components in percentage by weight: 1-5wt% of an oxidant, 0.01-4wt% of a surfactant, 0.01-3wt% of an organic additive, 0.2-30wt% of polishing particles and the balance of pH regulators and water. According to the chemical mechanical polishing liquid disclosed by the invention, the chemical mechanical polishing liquid of different components is utilized for polishing titanium metal with the advantages of controllable rate, high surface quality and low corrosion, and the requirements on the surface quality of the titanium metal in the industry can be met.

The invention discloses a liquefied natural gas sampling and continuous collecting device, which comprises a sampling system, a gasification system, an on-line analysis system and a continuous collecting system, wherein the sampling system comprises an LNG sampling probe, a sampling pipeline and an LNG filling pipeline; a closed deep cooling cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating manner; the LNG filling pipeline is arranged in the LNG sampling probe in a penetrating mode and communicates with a closed deep cooling cavity; one end of the sampling pipeline penetrates through the closed deep cooling cavity and is connected to the gasification system; the gasification system is used for gasifyingan LNG sample conveyed by the sampling pipeline; the on-line analysis system is connected to an outlet of the gasification system and is used for carrying out on-line analysis on a gasified natural gas sample and providing gas component parameters; and the continuous collecting system is connected to the outlet of the gasification system and is used for continuously collecting the gasified natural gas samples.

The invention relates to the technical field of composite materials and polymer functional materials, in particular to a preparation method and application of a gradient hydrogel soft drive. The preparation method of the gradient hydrogel soft drive comprises the steps that a certain amount of negatively-charged ascidian cellulose nanocrystals, N-isopropenyl acrylamide, an auxiliary and water areevenly mixed at the certain temperature, and thus a mixed solution is obtained; and the mixed solution is induced through a direct current electric field, and then in-situ thermal-initiation polymerization is conducted to prepare the gradient hydrogel soft drive. The gradient hydrogel soft drive is prepared from the ascidian cellulose nanocrystals and the poly N-isopropenyl acrylamide in a compounded mode; the negatively-charged ascidian cellulose nanocrystals are subjected to electric field force and thus move to form the gradient concentration, and finally, in-situ initiation polymerizationis conducted to form the hydrogel soft drive of a gradient cross-linking structure; and the hydrogel soft drive has the controllable temperature-sensitive bending rate and fatigue resistance.

Disclosed is a direct current linear motor drive elevator door, which uses moving-iron direct current linear motor as the directly-driving power source to elevator carriage door device, and samples the mechanical system of the door device. Compared with rotating variable-frequency door device and inductive variable-frequency door device, the manufacture of said device is simple, and the control system is also simple. Using low-voltage direct current makes the elevator door device is safe, reliable and without noise. And the magnetic levitation technique also can be introduced to make the device have more perfect property.

The invention provides an ultra-high strength steel in-situ wire-powder composition-adjustable composite additive device. The device comprises a plasma arc generating mechanism, a paraxial air powderconveying mechanism, a wire feeder and a vibrating mechanism, wherein the paraxial air powder conveying mechanism comprises a paraxial air powder cover, a spiral air powder groove is formed in the airpowder cover, an annular funnel filter is arranged in the air powder cover, and an aperture adjusting switch valve is arranged at the lower end of the air powder cover. According to the composite additive device, a set vibration and airflow composite mode is adopted in a gun body, quantitative opening of a plurality of preset alloy powders is achieved, the powders are spirally mixed in an decelerated mode, sieved and uniformly mixed, and the uniform powders are sent out of the gun body; and through the vibration and air flow composite powder feeding and the plasma flow force composite driving, the preset alloy uniformly-mixed powders and a conventional wire material with a set wire feeding speed are compounded below the gun body and then conveyed into a molten pool through a paraxial shaft, and additively manufactured into multi-component alloy materials under the stirring force of the molten pool. The device can produce composite components with adjustable composition in different areas of a metal matrix according to different requirements through additive manufacturing.

The invention provides a centrifugal acceleration emission device based on motor driving. The centrifugal acceleration emission device comprises a round wheel disc, an outer wall, an emission conduit, an emission angle adjusting base, a rotary driving part, a motor and a filling device, wherein the emission angle adjusting base is wedged into the bottom of the fixed wheel disc and is used for adjusting an emission angle; an integrated supporting piece fixed wheel disc is composed of the round wheel disc and the outer wall and is used as a bottom surface of a supporting piece; the round wheel disc comprises an involute groove and the starting point of the groove is not located at the circle center of the fixed wheel disc; the emission conduit is fixed at the outer part of the round wheel disc and is connected with an outlet position of a connection groove; the motor and the rotary driving part are connected with an upper wall of the outer wall; the lower surface of the rotary driving part and the plane of the round wheel disc are not contacted and a gap is formed between the lower surface of the rotary driving part and the plane of the round wheel disc; the rotary driving part comprises a middle shaft and at least one driving bracket; the middle shaft is used for transmitting rotary output of the motor to the driving bracket; the filling device is mounted right below the starting point of the groove and is used for filling round balls into the round wheel disc.

The invention relates to radiation curable polycaprolactone diol as well as a preparation method and application thereof. The number-average molecular weight of the radiation curable polycaprolactonediol is 300 to 6000; a structure formula of the radiation curable polycaprolactone diol is shown in the description, wherein the sum of x and y is an integer from 1 to 50. A main chain of the radiation curable polycaprolactone diol provided by the invention contains an unsaturated double-bond; under the heat and radiation conditions, the unsaturated double-bond in the polymer main chain generatescrosslinking so that the mechanical property, the chemical-resistant performance and the dimension stability of the product are improved. In addition, only one unsaturated double-bond is contained inthe polymer main chain, so that the controllable speed in the subsequent heat and radiation curing is ensured. In addition, the double-bond has the controllable crosslinking density; the comprehensivephysical and chemical performances of the product are improved, for example the stretch intensity is higher; the modulus is greater; the solvent-resistant performance is better; the high-temperature-resistant performance is better; the acid value is lower; the anti-yellowing performance is excellent. In addition, the radiation curable polycaprolactone diol provided by the invention has the advantages that the main chain is provided with branch chains, so that the crystallization temperature is reduced; the use is more convenient.

The invention discloses a method for promoting carbon monoxide release of carbon monoxide-releasing molecules (CORM) and preventing sedimentation and belongs to the technical field of medical chemistry. The method particularly comprises the following steps: dissolving CO releasing molecules in dimethyl sulfoxide, and adding amino acid, or derivatives thereof, or medicine molecules and an EDTA water solution. After adding of EDTA, generation of CO is effectively promoted, and sedimentation in reaction can be quickly removed. The method has good university; compounds related to the reaction have excellent biocompatibility; and after release of CO, sedimentation can be quickly and effectively prevented, and the CO release time and rate can be easily controlled.

The invention discloses a high-property non-combustible external wall thermal-insulation decorative sheet. The high-property non-combustible external wall thermal-insulation decorative sheet comprises a base plate which is of a rectangular thin-slab structure and a metal panel box. The upper surface of the base plate is covered with the metal panel box and the periphery of the metal panel box is turned over by 90 degrees to wrap the upper portions of the four side surfaces of the base plate. The portions, abutting against the four side surfaces of the base plate, of the metal panel box are each provided with at least two long-strip-shaped frame notches. The thermal-insulation decorative sheet is good in fire prevention and thermal-insulation property, convenient to install and attractive in appearance. The invention further discloses a preparation method of the high-property non-combustible external wall thermal-insulation decorative sheet. The preparation method mainly includes the three steps of preparation of the base plate, forming of the metal panel box and composite forming of the decorative sheet. All raw materials adopted in the method are easy to obtain and low in price. The decorative sheet obtained through the preparation method has the characteristics of being high in combustion grade, good in thermal-insulation property, low in smoke toxicity, long in service life, good in decorative effect, convenient to clean and maintain in later stage and the like.

The invention provides an alloy etching liquid which comprises the following components: 5-25wt% of acetic acid, 1-35wt% of hydrogen peroxide, 0.1-5wt% of a surfactant, 0.1-5wt% of a defoamer, and thebalance deionized water. The alloy etching liquid provided by the invention has the beneficial effects that aiming at a special sandwich structure shown in figure 1, the compatibility of acetic acidand hydrogen peroxide is adopted, so that the etching rate can be effectively controlled, the rates of etching on different layers can be consistent, and the etching effect can be improved; and experimental results indicate that when the alloy etching liquid provided by the invention is adopted for etching a three-layer alloy structure shown in figure 1, a smooth etching interface can be formed, the etching rate can be controlled, and residues can be prevented from being left on the surface. The invention further provides an alloy etching method.

The invention discloses a flexible expansion shaping device for curved parts, which is a flexible processing device for shaping large-sized three-dimensional curved parts in an expanding way. The device mainly comprises a machine body framework, an expansion shaping platform, a pre-stretching and clamping mechanism and a reconfigurable multi-point die, wherein expansion shaping is implemented by pushing the reconfigurable multi-point die (7) positioned on an upward and downward movable platform (12) towards a pre-stretched plate upwards through a main thrust hydraulic cylinder (10); pre-stretching and edge pulling are implemented by driving stretching clamps (5) positioned on left-handed and right-handed screws (4) to move synchronously and oppositely in a way of synchronously driving front and back left-handed and right-handed lead screws (6) through a servo motor (1); and the stretching clamps (5) consist of odd-number clamps, and the clamping force is controlled through clamping hydraulic cylinders (8). The reconfigurable multi-point die and an uplifting expansion shaping device are integrated together, so that curved parts of multiple different geometrical shapes can be shaped by using one set of expansion shaping device, and the manufacturing cost is low.

The invention belongs to the technical field of integrated circuits, and particularly relates to a power consumption and rate adjustable physical random number generation method. The device comprisesan entropy source module, an entropy sampling module and a clock signal. The entropy source module is composed of M ring oscillators, a node of each ring oscillator serves as signal output at the sametime, and the output of the nodes presents periodic signals and chaotic signals by adjusting the working voltage of the digital logic circuit. The entropy sampling module performs quantitative sampling on output signals in each ring oscillator through a D trigger to generate a random bit sequence. The random bit sequence generates a periodic signal when the digital logic circuit is in a low-voltage state. When the digital logic circuit is in a high-voltage state, a chaotic signal is generated. The oscillation sampling method and the chaotic circuit method are combined, the speed and power consumption of the physical random number generator are controlled by adjusting the voltage, the circuit structure is simple, and integration and miniaturization are easy to achieve.

The invention discloses a method for temperature rise of a sample before a dynamic loading process. A limiting loading device is arranged to applying a persistent pressure, and comprises a limiting frame fixed on an electrode plate by a plurality of fixing screw rods; a limiting rod suspended above a sample is arranged on the limiting frame, the tail end of the bottom of the limiting rod is provided with a limiting washer acting on the sample, and a pressurizing spring sleeves the limiting rod between the limiting washer and the limiting frame. After the sample is fixed, persistent pressure is applied to the sample, so that glue can be extruded from an interlayer after being melt in a temperature rise process, the sample is kept at the original position, clearances between the sample and the electrode plate of which the surface is flat by polishing as well as between the sample and a LiF window with a polished surface are eliminated due to the persistent pressure, displacement is avoided, the aim of improving a loading quality is improved, experimental data are more accurate and measuring precision is improved.

The present invention provides a shrimp seed counting device and method. The shrimp seed counting device comprises: a support module; a storage module, wherein at least one holding cavity with an opening is limited in the storage module, the at least one holding cavity is internally provided with shrimps and water, and the support module is connected with the opening; a swimming lane which is a hollow structure and is arranged at one side of the support module, wherein one end of the swimming lane communicates with the opening of the storage module, and the shrimps and water pass through the swimming lane through one end of the swimming lane; and a counting module oppositely arranged with the swimming lane and configured to perform counting of shrimp seeds passing through the swimming lane. According to the shrimp seed counting device provided by the embodiment of the invention, through combination of the storage module, the swimming lane and the counting module, the shrimp seed counting device performs accurate counting of the shrimps, is convenient to use and reduces the labor intensity.

The invention provides an indoor cement pond high-density breeding method of oxygymnocypris stewarti. The indoor cement pond high-density breeding method of the oxygymnocypris stewarti comprises the following steps: selecting fish fries longer than 3 cm for breeding; before stocking of the fish fries, soaking a cement pond in potassium permanganate for disinfection for 24 h, and after disinfectionis completed, supplying water; stocking 500-1000 fish fries per square meter of a water body, and soaking the fish fries in 1% saline water for disinfection for 3-5 minutes before stocking; and controlling the water temperature of the cement pond to be 8-18 DEG C and a concentration of dissolved oxygen to be 5 mg / L or above, and conducting feeding two times every day, wherein feed is frozen chironomidae larvae, and the put volume of the feed is 3-5% of the total weight of daily fish bodies. The method has the characters that the density is high, a yield is high, and catching is easy, and is suitable for large-scale artificial breeding of the oxygymnocypris stewarti.

The invention discloses kneading equipment for processing dough with high content of coarse cereals. The kneading equipment comprises two fixed seats which are symmetrically fixed on a working surface, a kneading barrel is fixedly connected to the top ends of the two fixed seats through screws, a feeding funnel is connected to the top surface of the kneading barrel in a penetrating manner, and horizontal plates are welded to the two sides of the top end of the kneading barrel; rotating rods are rotatably connected between one ends deviating from the kneading barrel, of the horizontal plates and the fixing base, fixing rods are further rotatably connected to the middle of the front side of the top surface of the kneading barrel, and the upper ends of the rotating rods penetrate through thehorizontal plates and are rotatably connected with the fixing rods through a conveying belt; a mounting frame is also fixed to the top surface of one horizontal plate on one side; and servo motors I are fixedly connected to the inner bottom surface of the mounting frame through screws. The kneading equipment is reasonable in design and compact in structure, coarse cereal powder is uniformly pressed during kneading, the early-stage processing quality of dough is well guaranteed, and certain guarantee is provided for subsequent high-quality production of pastries.

The invention relates to the technical field of flat plate impact experiments, in particular to a heating device and method, and provides a heating device and a heating method for heating a sample before a flat plate impact experiment. The heating device comprises a heat conducting tray and a heating coil. The heat conducting tray is provided with a through hole along the axis. The heat conductingtray is also provided with an annular groove coaxial with the through hole. The heating coil is wound in the annular groove. The heating coil is connected with a temperature regulating circuit. The sample area is heated by the heating coil before the flat plate impact experiment is performed. The device can effectively heat the sample and perform the flat plate impact experiment and has a small overall structure and a simple structure and can effectively heat the sample without affecting the flat plate impact experiment and the use of the velocity measuring system.

The invention provides a rice plant carbon isotope field in-situ calibration system, which comprises the following components: a carbon marker release device, which comprises a motor, a screw, a sliding member and an injector, wherein the motor is in transmission connection with the screw and is used for driving the screw to rotate, the sliding part is connected with the screw rod and the injectorand is used for sliding under the driving of the screw rod so as to extrude and release the carbon marker in the injector; a marking box, wherein the marking box is hollow, an opening is formed in the bottom of the marking box, and the marking box is communicated with the injector through a carbon marker release tube; and a motor controller connected with the motor through a first signal line andused for sending a signal for driving the screw to rotate to the motor. The invention further provides a rice plant carbon isotope field in-situ calibration method. According to the rice plant carbonisotope field in-situ calibration method, 13C in-situ calibration is conducted on rice plants under the field in-situ condition, the process is controllable, measurement is accurate, human interference is reduced, and the 13C marking cost is reduced.

The invention provides a polyion composition micelle medicine carrying material. In the material, the molecular weight of the polymer is controllable, thus the size, the medicine carrying quantity and the medicine releasing speed of the micelle are controllable, so that the invention provides a base for the research in medicine controlled-release carriers. The medicine carrying material is graft copolymer polyethylene glycol-graft-poly radix asparagi hydrazide formed by modifying radix asparagi hydrazide through single methyl ether polyethylene glycol (see the structural formula); in the structure of the polyethylene glycol-graft-poly radix asparagi hydrazide, n plus m is between 200 and 400. The whole preparation process of the micelle is very simple and easy for mass production. The polyion composition micelle medicine carrying material can be applied to the preparation of polyion composition micelles used for the intravascular injection or the intramuscular injection of albumen polypeptide drugs or nucleic acid drugs with negative charges.

The invention discloses an emergency oxygen supply device, and belongs to the technical field of emergency life-saving equipment. Comprising an oxygen production module, a cooling, humidifying and impurity removing module, a buffer module, a gas proportioning module, a gas conveying module and a positioning display module, the oxygen production module, the cooling, humidifying and impurity removing module, the gas proportioning module and the gas conveying module are sequentially communicated, and the buffer module is communicated with the gas proportioning module. Compared with the prior art, the method has the advantages that firstly, the oxygen production reaction rate and process are controllable, and the requirements of people for the oxygen supply speed in different physiological states are met; secondly, a cooling, humidifying and impurity removing module is arranged, and generated gas is high in safety and comfort degree; thirdly, a gas proportioning module is arranged, so that the device can be used for emergency oxygen supply for coma people; and finally, accurate positioning can be achieved, a rescuer can conveniently lock the position of the device, and rescue is carried out in time.