222 results about "High latitude" patented technology

The invention relates to a portable, skid mounted, wheeled and / or collapsible hybrid-power lighting and energy management system for harsh, remote and / or high latitude locations. The system combines an internal combustion engine (ICE) power source with a control system for providing power to light system. The system may also include a battery storage system, an ICE heating system and / or renewable solar and / or wind power systems in a manner that improves efficiency and reliability of operation in such locations, while preserving and improving functionality of operation and significantly reducing operator interaction during set-up and operation.

The invention relates to a radiation therapy device of a multi-alignment body which comprises a shield, and a source body and a final alignment body which are arranged on the shield, wherein a plurality of radioactive sources are loaded in the source body, at least one middle alignment body is arranged between the source body and the final alignment body, the source body, the middle alignment body and the final alignment body are respectively connected with a gear power transmission mechanism, which can independently rotate relative to the same rotary center line, the final alignment body comprises various groups of through holes with different diameters, the middle alignment body comprises at least one group of though hole, at least one group of through hole in high-latitude regions and at least one group of through hole in low-latitude regions. In the process of treatment, the invention can automatically combine radiation beam according to the need of treatment proposal, the dynamic conformity of a dose field is realized, the auxiliary time of the radiation therapy is shortened, and the efficiency of the radiation therapy is improved.

The invention relates to a heat-pipe type solar energy photoelectric and optothermal comprehensive utilization system, which comprises a storage tank and a photovoltaic / hot water panel which are communicated with each other through a water channel, wherein the photovoltaic / hot water panel comprises heat pipes, photovoltaic cells and a heat-conductive metal plate; the photovoltaic cells are connected in series into a strip and uniformly distributed on the upper surface of the heat-conductive metal plate; a gap is reserved between two adjacent rows of the photovoltaic cells; evaporation sections of the heat pipes are uniformly distributed on the rearward of the heat-conductive metal plate; an evaporation section of each heat pipe is positioned on the gap between the two adjacent rows of the photovoltaic cells; a heat-insulating layer is also arranged on the rearward of the heat-conductive metal plate; the heat pipes are enveloped by the heat-insulating layer; copper sleeves are uniformly distributed on a heat-collecting flow channel pipe and are perpendicular to the heat-collecting flow channel pipe; and a condensation section of each heat pipe is inserted into a copper sleeve. The heat-pipe type solar energy photoelectric and optothermal comprehensive utilization system has the advantages that the solar energy comprehensive utilization efficiency of the system is greatly improved; as the system can be used in cold regions with high latitudes, the territorial scope of the use of the system is enlarged; and as the system achieves the indirect heat conducting through the heat pipes, the corrosion degree of running water on solar panel cores is greatly reduced and the service life of the solar panel cores is prolonged.

The present invention relates to satellite systems and more particularly, to the provision of a satellite system for weather and climate monitoring, communications applications, and scientific research at higher latitudes, referred to as the circumpolar region and defined here as the area with latitudes greater than 60°, in either the northern hemisphere or the southern hemisphere. Contrary to the teachings in the art it has been discovered that a satellite system and method may be provided using satellites in 24 sidereal hour orbits (geosynchronous) with inclinations (70° to 90°), orbital planes, right ascensions and eccentricities (0.275-0.45) chosen to optimize coverage of a particular service area located at high latitudes. A constellation of two satellites can provide continuous coverage of the circumpolar region. The satellites in this orbit avoid most of the Van Allen Belts.

Disclosed is a low-earth-orbit satellite orbit designing method for quickly revisiting discrete targets. The method includes (1), determining an inclination angle of a satellite orbit, wherein the inclination angle is not lower than the highest latitude Lmax of a ground target; (2), selecting a round orbit as the satellite orbit, wherein eccentricity ratio is 0; (3), executing a reconnaissance mission according to the ground target, determining a regression cycle of the orbit, utilizing the regression cycle to determine a semi-major axis of the satellite orbit, and then determining height of the orbit; (4), according to corresponding orbit ascending node longitude when sub-satellite points of an orbit ascending section and an orbit descending section of the satellite orbit pass the ground target, respectively determining ideal satellite orbit ascending node longitude of the orbit ascending section and the orbit descending section, performing optimization aiming at enabling the sum of designed satellite orbit ascending node longitude and a difference value of the ideal satellite orbit ascending node longitude of the orbit ascending section and the orbit descending section of the ground target, and determining ascending node longitude of the satellite orbit to be L; (5), utilizing the orbit inclination angle, the round orbit and the eccentricity ratio thereof, the orbit height and the ascending node longitude of the satellite orbit to complete designing of the satellite orbit.

A method for avoiding co-channel interference of a polar orbit constellation by using phased array beam reconstruction, including: calculating an average coverage multiplicity at different latitudes;determining a minimum average coverage multiplicity that ensures continuous coverage conditions; according to a polar orbit constellation operation law and a satellite beam strategy, calculating a maximum average coverage multiplicity of a satellite on which overlapping of same frequency beams does not occur; according to a latitude range in which the satellite is operating, determining a ground coverage beam used by the satellite in different latitude ranges; and according to the determined ground coverage beam used by the satellite in different beam ranges, generating a control strategy thatis on the ground coverage beam and that is performed by a phased array antenna during satellite operation, and automatically performing, by the polar orbit constellation, beam control of the phased array antenna according to a latitude of a sub-satellite point of the satellite and in accordance with the control strategy that is on the ground coverage beam and that is performed by the phased arrayantenna, so that overlapping of the same frequency beams does not occur in a high latitude area under the condition of ensuring continuous coverage, thereby avoiding the co-channel interference between the same frequency beams.

The invention discloses a panoramic image mapping method and an inverse mapping method. In a mapping process, a panoramic image or a spherical surface corresponding to a video A is mapped into a two-dimensional planar image or a video B. The method comprises the following steps: firstly, partitioning the spherical surface into three regions, namely, a region I, a region II and a region III according to the latitude of the spherical surface; mapping the three regions into a square plane I', a rectangular plane II' and a square plane III' respectively; and splicing the plane I', the plane II' and the plane III' into one plane, wherein the obtained plane is the two-dimensional planar image or the video B. Compared with an existing common mapping method, the method has the advantages that oversampling of a high-latitude region is improved effectively, and a code rate needed by coding and the decoding complexity can be lowered effectively. The panoramic image mapping method and the inverse mapping method relate to the field of virtual reality, and can be applied to panoramic images and videos.

The invention relates to a portable, skid mounted, wheeled and / or collapsible hybrid-power lighting and energy management system for harsh, remote and / or high latitude locations. The system combines an internal combustion engine (ICE) power source with a direct current power generator and a battery storage system for providing power to light system. The system may also include an ICE heating system and / or renewable solar and / or wind power systems in a manner that improves efficiency and reliability of operation in such locations, while preserving and improving functionality of operation and significantly reducing operator interaction during set-up and operation.

The invention discloses a drug sensitivity prediction method for cancer precision treatment. Anti-cancer drug sensitivity prediction is performed by comprehensively utilizing genomics data of cell lines, so that theoretical medication guidance is provided for individual treatment. A calculation model is built for predicting drug sensitivity to individuals, thereby guiding clinical medication, which is one of core goals of precision treatment. According to the method, interaction terms among genes are added by utilizing a protein interaction network; a mutual relationship among the cell lines is described by utilizing the similarity of gene expression profiles of the cell lines; a local weighted linear model is built without depending on an independence assumption among genomic characteristics; and compared with a conventional linear model, a better prediction effect is achieved, the problem of high-latitude input caused by large-scale data characteristics is solved, and the operation cost of the model is reduced. The method can be widely applied to the drug sensitivity prediction of new cell lines, and provides the theoretical guidance for guiding the clinical medication.

The invention provides a low-orbit microsatellite formation system suitable for medium / high-latitude region coverage. According to the low-orbit microsatellite formation system, a surface projection principle is designed based on Flower constellation, all satellites constitute a compact geometric space configuration at the initial moment of a regression period, and the topological structure is ensured to have a periodical repeat property relative to all points on the ground; highly elliptical orbits which are completely the same in shape are adopted for all the satellites in the formation; and a plurality of permanent inter-satellite links are established under the condition of guaranteeing no link overlap inside the formation. According to the low-orbit microsatellite formation system provided by the invention, the complexity of a ground tracking control system can be reduced greatly, the optimization of inter-satellite links and the increase of communication reliability are facilitated, a favorable ground multi-coverage characteristic of medium / high-latitude regions is guaranteed, and the low-orbit microsatellite formation system has wide application values and development prospects in the field of space communication.

The invention discloses an extended period prediction method considering a large-scale circulation background field. By considering of different large-scale circulation backgrounds, in combination with the high-latitude and tropic interaction and influence thereof on the weather in an area extended period in a use process, optimal factors in different backgrounds are selected; and, due to regression of multiple factors, a target is predicted. According to the extended period prediction method considering the large-scale circulation background field disclosed by the invention, for different large-scale background fields, prediction is carried out by selection of proper factors; therefore, the prediction skill is improved; and the method has wide application prospect in diagnostic analysis and prediction for multi-scale characteristic variables.

The invention discloses an involute spherical gear transmission pair. The involute spherical gear transmission pair comprises two spherical gears, wherein involute gear teeth are uniformly distributed on the circumferences in the weft directions of the spherical surfaces of spherical cap sections on spherical caps; the tooth thickness directions are along the weft directions of the spherical caps; the numbers of the teeth on the wefts at different heights are variable; the number of the teeth on low-latitude parts is large; the number of the teeth on high-latitude parts is small; a plurality of tooth rings from the high latitude to the low latitude are formed. The spherical gears are sectioned over the axis; the outer contours of the sections of the tooth rings form the outer contours of the involute spherical gear teeth along the meridians in the tooth thickness directions; the outer counters of the gear teeth formed by the sections of the tooth rings are divided into two groups; odd-number groups and even-number groups are respectively the same as the shapes of the end surface teeth of two straight gears of which the gear teeth are placed in a staggered way.

The invention discloses a summering cultivation method for seedlings of Hizikia fusiform (Harv)Okamura juvenile sporophytes, comprising the following steps: raising seedlings in a north sea area at a high latitude during the high temperature stage; and transferring the cultivated seedlings to a south cultivation sea area at a low latitude after summering for cultivation. In the invention, seedling raising and cultivation are performed in different levels and sea areas, thus overcoming the disadvantageous sea conditions in cultivation sea areas, and avoiding high energy consumption in an indoor temperature-reduction cultivation mode.

The invention discloses an integrally packaged type solar heat collector with combined curved surface for light collection and vacuum tube for heat collection, belonging to the technical fields of solar light collection and medium and high temperature solar heat collection. The solar heat collector of the invention comprises a combined curved surface light collector, a vacuum tube heat collector, an adjustable tracker, a packaging shell and the like. After the sun light enters the combined curved surface light collector through a transparent glass cover plate, the sun light is reflected through an inner surface of the combined curved surface light collector and collected onto the vacuum tube heat collector, the vacuum tube heat collector absorbs the sun light to generate high-temperature heat energy, and the heat energy is conducted and transmitted to users by a heat conducting working medium in the vacuum tube heat collector. The invention can collect the sun light with low energy flow density after being reflected by a plurality of curved surfaces on the vacuum tube heat collector, thus the heat conducting working medium in the vacuum tube can be quickly heated to form high-temperature heat energy. The manually adjusted tracker can adjust the orientation of the combined curved surface light collector to track the sun, thereby enabling the heat collector to keep in the optimal sun light collecting state. The invention is especially suitable for use in high-latitude areas and in winter when the solar altitude is smaller.

The invention discloses a low-temperature cold start device for the engine with methanol as fuel and the control method, which is characterized in that a gasoline vacuum atomizer is arranged in the cold start device; one end of the atomizer is connected with a gasoline pump and the other end is connected in parallel with a gas inlet pipe of the methanol engine through a solenoid valve and a fuel feed pipe; the opening of the solenoid valve is controlled by an electric control unit to control the change from the gasoline mode to methanol mode. The control method is as follow: i. when the device temperature is below 0 DEG C, the electric control unit can drive the solenoid valve to start the engine working at gasoline mode; ii. when the device temperature is higher than or equal to 10 DEG C and when the stable speed of the engine exceeds 700 r / min., the injection quantity from the methanol spray nozzle is increased gradually, and the lift range of the solenoid valve is decreased automatically by the electric control unit; iii. when the consumption quantity of gasoline fuel is zero, the solenoid valve is switched off and the engine is operated at the methanol mode. The low-temperature cold start device for the engine with methanol as fuel and the control method has the advantages that because the methanol can be changed to gasoline when starting, the normal starting of the device in high latitude area can be realized and the low-temperature cold start device is easily used for the prior methanol engine.

A technique for cultivating tea trees in the in high-latitude area features dual-line close planting, reasonal management to fertilizer and water, scientific pruning, proper picking up and thermal insulating in the winter. It can increase yield by 40%.

Provided is a construction method for abutting high-altitude long-span roof pipe trusses by an adjustable temporary support. The device comprises a standard section support frame (1), an adjustable support (2), a conversion platform (3), beams (4), a hinged shoe (5), nuts (6), batten plates (7), adjustable supporting leg (8), U-shaped fixing bolts (9), a support (10), arc support plates (11), lower chord tubes (12) and upper chord tubes (13). When the adjustable temporary support is used for abutting the pipe trusses, positioning control is utilized in high-latitude contact and assembly welding of large proof pipe trusses, so that the pipe trusses are subjected to assembly welding in a force-free state, the utilization rate of a crane is greatly increased, accuracy and quality of welding are guaranteed, the construction speed is increased, and risk factors and potential safety hazards caused when the pipe trusses are suspended by the crane for abutting can be reduced. Besides, the structure is simple, the generality is high, and construction cost can be saved.

The invention provides a method for cultivating table grapes in high-cold and high-latitude area in winter. The method comprises the following steps of building a garden, using a high-cold and high-latitude efficient energy-saving solar greenhouse to build the garden, planting and managing grapes, leaving grapes on vines to keep fresh, watering once when the grapes are grown, laying mulch films every other days, controlling the temperature in the greenhouse by controlling time for closing an air inlet, releasing a curtain and rolling up the curtain. When the external temperature decreases below 5 DEG C, thermal insulation is carried out to control the indoor temperature at 10 DEG C. When the external temperature decreases below -10 DEG C, the indoor temperature is controlled at 8 DEG C in day time and at 2 DEG C at night until the grapes are harvested to be sold. The grapes cultivated in the method can be harvested to be directly supplied to fruit markets, the step of storing and refreshing the grapes through chemical agents is removed, the problems of dry peduncles, grape falling, browning, rotting and the like are solved, refreshment of the grapes are achieved to the maximum degree, and meanwhile chemical agent residue is reduced. Furthermore, when the grapes are on grape vines, the sugar content of the grapes gradually increases, and the fruit quality is improved.

The invention relates to a mangrove plant northward movement and domestication method. The method sequentially includes the following steps of firstly, collecting mangrove plant hypocotyls good in development, soaking the hypocotyls in local seawater, and transporting the hypocotyls to a planting land as soon as possible; secondly, inserting and planting the mangrove plant hypocotyls in the planting land; finally, constructing a greenhouse in the planting land before winter to ensure that tidewater can normally rise and fall in the greenhouse, and conducting high-temperature and low-temperature alternating domestication culture on the mangrove plant hypocotyls inserted and planted in the planting land. By means of the method, autumn eggplant seedlings can be domesticated under the naturalconditions, the environment temperature is continuously adjusted through the greenhouse in the seedling breeding process in winter, on one hand, the autumn eggplant seedlings are protected against theinfluences of extreme weathers, and on the other hand, the seedlings slowly adapt to the cold weather, and the adaptability to low temperature of the seedlings is improved; the seedlings are domesticated on the aspects of environment temperature, seawater salinity and soil texture, the survival rate of mangrove plants in high-latitude regions is increased, and mangrove forests can grow in high-latitude regions from 28 degrees northern latitude to 31 degrees northern latitude.

A method of producing ethanol, which comprises of starch obtained from continuously cultivated unicellular green algae strains which reproduce through a single cell clone cultivation method that cyclically produces starch extra-cellularly. Only the starch is recovered and goes through a saccharification and fermentation process for the production of ethanol. The algae are left for continual reprocessing. The obtained starch is then saccharified and fermented to produce ethanol. This production method is available and feasible in any part the world, from tropical areas to high latitude areas because it is controlled not by natural climatic conditions but in an environment that is monitored and controlled by humans. The continuous production process from these Chlorella algae strains can reduce the production cost of ethanol production as well as contribute to reducing industrial wastes and carbon dioxide to contribute to the earth's environmental wellbeing.

The invention provides an environmentally friendly renewable energy harvesting system for harvesting wind energy on a frozen surface, as in cold weather climatic regions associated with higher latitudes or higher altitudes, with snow or ice surfaces. A plurality of ski, skate or runner supported wings or sails are connected together to form a wind energy harvesting system, and capture wind energy by appropriate setting of wing or sail angles of attack so as to drive a cyclic motion that in turn can drive energy capture means such as electric generator means. The invention thus provides a wind energy harvesting system which is supported by a frozen surface, which includes fluid-foil means for interfacing with an air current such as a wind and which includes energy harvesting means utilizing periodic motion of the fluid-foil means for capturing wind energy and converting it into usable energy in a desired form such as electricity. The present invention is intended to provide devices, methods and systems for harvesting renewable energy which can be efficient and cost-effective for small-scale, medium-scale and large-scale applications, to provide real and substantial benefits to meet local energy needs while also more broadly serving humanity and our global environment.

A method of producing ethanol, which comprises of starch obtained from continuously cultivated unicellular green algae strains which reproduce through a single cell clone cultivation method that cyclically produces starch extra-cellularly. Only the starch is recovered and goes through a saccharification and fermentation process for the production of ethanol. The algae are left for continual reprocessing. The obtained starch is then saccharified and fermented to produce ethanol. This production method is available and feasible in any part the world, from tropical areas to high latitude areas because it is controlled not by natural climatic conditions but in an environment that is monitored and controlled by humans. The continuous production process from these Chlorella algae strains can reduce the production cost of ethanol production as well as contribute to reducing industrial wastes and carbon dioxide to contribute to the earth's environmental wellbeing.

The invention discloses an extra high-energy spark discharge system. The system comprises an ignition energy control unit, an inductive discharge unit, a DC (Direct Current)-DC boosting unit, an energy-storage capacitor bank and a combined outward opening-type spark plug. According to the system, by inductive discharge, a spark plug gap is broken down, and a plasma channel is formed between a positive electrode and a negative electrode, and therefore, a high-energy capacitor connected in parallel near the spark plug is caused to discharge. Different from other high-energy ignition systems, the extra high-energy spark discharge system can reach as high as several Joules in single ignition energy, and meanwhile, a stable shock wave can be formed to prompt the formation of a fire core. The extra high-energy spark discharge system can be used for lean combustion occasions with higher flow rate and lower temperature, such as high-latitude gas turbine engine restart, pulse detonation engine start, homogeneous charge compression ignition piston engine ignition, pressurizing direct injection gasoline engine ignition and the like. The combustion stability can be remarkably improved, the combustion efficiency is improved, and pollutant emission during a combustion process is reduced.

The invention relates to a cold-resistant acclimation method for kandelia candel seedling pot plants planted at a high latitude. The method successively comprises the following steps that firstly, kandelia candel hypocotyls developing well are collected, soaked by using seawater and transplanted to a planting field as soon as possible; secondly, flower pots are placed on the planting field and then filled with planting soil; then, the kandelia candel hypocotyls are inserted and planted in the flower pots; finally, before winter, a greenhouse is built on the planting field, it is guaranteed that tidewater can normally rise and fall to the interior of the greenhouse, and the kandelia candel hypocotyls which are inserted and planted in the flower pots are subjected to high-temperature and low-temperature alternative acclimation cultivation. According to the cold-resistant acclimation method, in the natural mudflat environment, a potting technology is used for seedling raising and acclimation at the same time, the survival rate is increased, and afforestation through kandelia candel is achieved in harsh mudflats; in the seedling raising process in winter, the environmental temperatureof the greenhouse is continuously adjusted, so that seedlings gradually adapt to the cold climate, the adaptive capacity to the lower temperature is improved, and the mangrove forest grows in a high-latitude area with the north latitude of 28-31 degrees.

The invention belongs to the technical field of polar region navigation of an inertial navigation system, in particular relates to a real-time measuring method of carrier attitude in a transverse coordinate system of the inertial navigation system, wherein the inertial navigation system uses the relationship of an inertial measurement unit output value in a transverse geographic coordinate system for real-time measuring of an attitude angle of a carrier relative to the transverse coordinate system. The real-time measuring method is as follows: measuring the transverse speed of the carrier; updating the transverse longitude and transverse geographic latitude of the position of a ship; obtaining a projection of earth's angular velocity in the navigation system in a polar region mode; obtaining a projection of angular velocity of a navigation coordinate system relative to an inertial coordinate system in a carrier coordinate system; obtaining angular velocity of the carrier relative to the navigation system; measuring a strapdown attitude matrix of the carrier; and measuring the attitude angle of the carrier relative to the transverse coordinate system. The real-time measuring method can realize High altitude real-time navigation, provides a mathematical model for a high latitude strapdown inertial navigation system, and avoids the problem that a common inertial navigation system cannot navigate in a high latitude region for the reason of calculation overflow.

The invention relates to a high-yield planting method for super hybrid indica type rice in high-latitude saline-alkali soil and belongs to the technical field of hybrid rice planting methods. The method solves the problem that the hybrid indica type rice can not be cultured in the high-latitude saline-alkali soil through the hybrid rice technology. The method comprises the steps of management during the seedling cultivation stage, wherein settlement of a seedling bed, seed soaking, seeding, ventilating, temperature managing, water managing during the seedling stage, fertilizer managing during the seedling stage and pest and disease damage managing are carried out; management during the rice seedling transplanting stage, wherein soil leveling, alkali washing, alkali pressing, seedling transplanting, water managing, fertilizer managing and pest and disease damage prevention and cure are carried out; management during the development stage, wherein water managing, fertilizer managing and pest and disease damage managing are carried out, a method of combining dry rice nursery and an arched shed is adopted, water is managed with the standard of improving the vitality of roots, irrigation and drainage of the water in the whole field are achieved, fine plowing and managing are carried out, and fertilizer management is strengthened. The cultivation method for the hybrid indica type rice in the high-latitude saline-alkali soil is innovated, the hybrid indica type rice in the south is introduced into the northern high-latitude area to be planted, and therefore the purpose of the high yield of the hybrid indica type rice in the high-latitude saline-alkali soil can be achieved.

The invention discloses a double-geographic-longitude-latitude grid dividing method. Geographic information data are obtained through a satellite, aerial remote sensing images and earth surface actual measurement, a double-geographic-longitude-latitude-grid expression module is established, double-geographic-longitude-latitude-grid regularized division is conducted on the geographic space of the earth surface, standard longitude-latitude-grid division and expression are conducted on the regions with low south latitude and low north latitude, rotary longitude-latitude-grid division and expression are conducted on the regions with high south latitude and high north latitude, divided geographic slices are expressed in multiple modes according to slice level rank numbers, the standard longitude-latitude range and the rotary longitude-latitude-grid range, conversion is conducted according to the requirements, and on the basis of a geographic dividing method based on a standard longitude-latitude grid, the accurate expression of the geographic space in the regions with high latitude is obtained. According to the double-geographic-longitude-latitude-grid dividing method, geographic poles are rotated, so that double longitude-latitude grids are established on the spherical surface of the earth, the regions with different degrees of south latitude and north latitude are divided according to the different longitude-latitude grids, and therefore the shortages, in the aspect of geographic space expression of the regions with high latitude, of the standard longitude-latitude grid and the shortages of tradition geographic division are overcome.

The invention relates to a cultivation system and a method for mangrove seedling distributed in the north of the border of mangroves. The cultivation system for mangrove seedling comprises waste heat recycling system and several sets of incubators; the incubator comprises mangrove plants, floating island sheet, planting cups, a cultivation case body, a supporting plate for floating island sheet, an emptying pipe, a vertical drain,a siphon standpipe, a blow-off pipe, overflow pipe, a water inlet. The waste heat recycling system provides warm water for each sets of the incubators. The cultivation method for mangrove seedling comprises the following steps: warm water source is produced by waste heat recycling system; sea mud is placed into the planting cup; environmental adaptation, sterilization and pest control are performed on the hypocotyl of mangrove plants and the mangrove plants are planted into planting cups; warm water is injected into the cultivation box; overflow of the overflow pipe is regularly checked and drain contamination treatment is carried out. The cultivation system and method for mangrove seedling fully utilize the waste heat resource, ensure the suitable water temperature for planting mangrove seedlings, realize the artificial cultivation of mangrove seedlings in high latitudes, and purify the water by using the developed roots of mangrove plants.

The invention discloses an early strength agent for cementation of oil wells in a low-temperature mining area and a preparation method thereof. The early strength agent is prepared by reacting a water-soluble calcium solution with a water-soluble silicate solution in a composite dispersant solution containing a cationic dispersant and an anionic dispersant. The early strength agent can be widely applied to cementation of the oil wells with high latitude, deep water layers and the like in the low-temperature mining area, so that the solidification efficiency of cement slurry is improved, the cement stone strength of the oil wells is enhanced, and the cementation efficiency is improved.