74results about How to "Guaranteed space" patented technology

The invention relates to a vehicle frame with full load, wherein the whole vehicle, via front surround skeleton, back surround skeleton, left surround skeleton, right surround skeleton, top cover skeleton and bottom support, forms one integrated frame, to improve the fastness of frame. Via each node, upright post, longitudinal beam, incline support, horizontal bema, bended beam, or plates, the front and back of frame are through, the upper and lower are through, and the left and right are connected to form a closed force loop; therefore, the force can be distributed to everywhere of frame, to be functioned uniformly and avoid supporting on one point; and the structure is formed by rectangle steel tubes whose strength is 3-6 times of common vehicle with reduced weight. With said invention, the deformation of impacted vehicle is minimum to protect passengers.

The invention discloses a UAV autonomous inspection insulator path planning method based on laser point cloud. The method comprises the following steps: acquiring power corridor laser point cloud datato obtain power line point cloud and tower point cloud data; calculating an OBB direction bounding box of each base tower point cloud and taking the center of the bounding box as a tower coordinate;calculating a two-side vertical plane equation which passes the coordinate of each base tower and is vertical to a strike line; performing distance vertical plane proximity search on power line points, and reserving power line point cloud within a threshold range; performing clustering and curve fitting on the reserved power line points to obtain a curve fitting equation; calculating and obtainingtower hanging point coordinates through the curve fitting equation, and simplifying the hanging point coordinates as insulator coordinates; and setting a camera focal length and a safe flight distance according to the insulator coordinates to form a UAV flight path connected with each photographing point. The technical problems of poor patrol path planning, large workload and the like in autonomous inspection path planning of the insulator UAV are solved.

The invention discloses a video noise reduction encoding method and a video noise reduction encoding. The video noise reduction encoding method comprises the following steps of: before video encoding, performing full-pixel noise reduction processing on a reconstructed image of a current image to be encoded; and performing video encoding on the current image to be encoded after the noise reductionprocessing. In the technical scheme disclosed by the invention, the noise in an acquired video image can be restrained, the accuracy of a block matching result in a motion estimation process is improved and the compression code rate is saved.

The invention discloses an air cleaning door which comprises a door body 1, a door frame, hinges, an air cleaning device and a fan 8, wherein one side of the door body 1 is connected with the door frame through the hinges; a cavity 2 is formed inside the door body 1; the air cleaning device and the fan 8 are installed in the cavity 2; at least one air inlet 3 is formed in the front face of the door body 1; at least one air outlet 4 is formed in the back face of the door body 1; the air inlet 3 and the air outlet 4 are communicated with the cavity 2; the air cleaning device comprises a rough filtration layer 5, an activated carbon layer 6 and a high-density air filtering material layer 7; the rough filtration layer 5, the activated carbon layer 6 and the high-density air filtering material layer 7 are sequentially arranged between the air inlet 3 and the air outlet 4; the rough filtration layer is made of rough filtration paper; and the high-density air filtering material layer is formed by adopting an HEPA (high efficiency particulate air) filtrating screen. The air cleaning door can effectively solve the problems that existing air cleaning doors are poor in cleaning effect and cause loud noise.

The invention provides an automatic capping heat-preserving system for molten steel bottles or hot-metal bottles. The automatic capping heat-preserving system can ensure the heat-preserving performance of molten steel bottles or hot-metal bottles without adding operation procedures of molten steel or iron, can also save production space, and solves the problems of present heat-preserving cap systems, including complex system structure, tedious operation and low reliability. Molten steel bottles or hot-metal bottles are placed on tank bases of a metallurgical transport tank car. The automatic capping heat-preserving system is characterized in that the automatic capping heat-preserving system is mounted on the metallurgical transport tank car.

The invention discloses an image classification method based on multi-sample dictionary learning and local constraint coding, and belongs to the technical field of artificial intelligence and the field of image classification. The method comprises the following steps: firstly, generating a virtual training sample and an initialization dictionary for a training sample by utilizing a K-SVD algorithm; learning a dictionary and a coding coefficient of the training sample by using all the training samples and the initialized dictionary; and then learning the coding coefficient of the test sample byusing the learned dictionary, learning the linear classifier coefficient by using the coding coefficient of the training sample, and finally performing classification identification on the coding coefficient of the test sample by using the linear classifier coefficient and outputting a classification result. When the method is used for image classification and recognition, the learned dictionaryand coding coefficient matrix can have better representation capability, and the classification accuracy can be obviously improved.

The invention discloses a circulating cooling system for a railgun rail and a cooling method. Outlets of a first pneumatic powder suction pump and a second pneumatic powder suction pump of the system are connected with a spray nozzle of the railgun rail. The railgun rail is connected with a gas separation device through a pipeline. The gas separation device is connected with a Fe2O3 reproduction device through a pipeline. The Fe2O3 reproduction device is connected with the second pneumatic powder suction pump through a pipeline. The railgun rail is mainly composed of a reaction channel, a trapezoid spray nozzle, a rail inner wall and a rail outer wall. A hollow communicated reaction channel is formed by the rail inner wall and the rail outer wall. The diameter of the reaction channel ranges from 20 mm to 25 mm. The thickness of the rail outer wall ranges from 4.5 mm to 5.5 mm. The side, close to the outer wall, of the inlet end of the reaction channel is provided with the trapezoid spray nozzle. The reaction channel is of a U-shaped structure. According to the circulating cooling system, the spray-out pressure of the spray nozzle is controlled by controlling the flow speed of a reaction medium entering the outer wall channel, continuously circulating cooling can be guaranteed, and the temperature of the railgun rail is lowered quickly.

The invention relates to a shell processing system filled with Pu'er tea. The shell processing system comprises a rotating disc; a plurality of bearing grooves distributed in a circumferential array mode are formed in the rotating disc; clamping assemblies are arranged in the corresponding bearing grooves; cap-digging assemblies fixed to the bottom of the rotating disc are correspondingly arranged under the corresponding bearing grooves; ejection assemblies fixed to the top of the rotating disc are correspondingly arranged over the corresponding bearing grooves; a scraper assembly, a pushing assembly and an autorotation assembly are further arranged on each cap-digging assembly; a sliding washing assembly is further arranged in each ejection assembly, and residual pulp is washed and cleaned through the washing assembly; all the assemblies are continuously and automatically matched; and the defect that in the prior art, operation of all the steps needs to be completed through manpower is overcome, the automation degree is improved, manpower and time are saved, the machining cost is reduced, the machining efficiency is improved, and better market benefits can be obtained.

The invention relates to an intelligent detection type automatic dehumidification electric shoe tree device. Improvement is made based on the existing shoe tree structure. An intelligent detection electric control mechanism is introduced. A first pressure sensor (5) and a second pressure sensor (6) are designed. Under the condition of achieving an intelligent detection function, a micro electric telescopic rod (7) between a vamp front support (1) and an upper rear support (2) is intelligently controlled. By lengthening and shortening the micro electric telescopic rod (7), the distance between the vamp front support (1) and the upper rear support (2) is changed, and thus, the shoe tree device can efficiently adapt to different sizes of shoes. Based on a designed humidity sensor (11), the humidity of the internal environment of shoes is detected. Through a specifically designed fan speed control circuit (12), a micro fan (9) works intelligently. The environment inside shoes can be dehumidified while shoes are prevented from deformation.

The invention relates to anti-sloughing modified starch for a drilling fluid and a preparation method thereof, and belongs to the field of additives for a drilling fluid in petroleum drilling engineering. The anti-sloughing modified starch is mainly prepared from the following raw materials: starch, low-carbon alcohol, a starch acylating agent, a cross-linking agent, a quaternary ammonium salt cationic agent and a catalyst. According to the invention, the anti-sloughing modified starch, which can resist 150 DEG C and has a remarkable anti-sloughing function, is prepared by modifying original starch by using a method of moderately crosslinking and controlling the proportion of anions and cations. The anti-sloughing modified starch is rich in raw materials, has good water loss reduction andinhibition effects, has no pollution to the environment, and has a stable performance.

The invention discloses a batching device for uniformly and continuously measuring microscale solid powder and particles and relates to the continuous and uniform measuring and batching device for metallurgy, construction materials, foods and other manufacturing fields. The batching device is characterized in that the device structurally comprises a feeding box, a variable-speed spiral conveyor connected with a discharging pipe of the feeding box, and a weighting spiral conveyor connected with a discharging outlet of the variable-speed spiral conveyor; an electronic scale is arranged on the weighting spiral conveyor, and the data of the electronic scale are connected with the control end of a variable-frequency and variable-speed motor of the variable-speed spiral conveyor through a programmable logic controller (PLC). According to the batching device for uniformly and continuously measuring the microscale solid powder and the particles, close-cycle control, continuous operation and sealed operation in the batching process are achieved, sufficient mixing time and mixing space of the microscale solid powder, the particles and materials are ensured; the precision, the continuity and the stability of adding the microscale solid powder and the particles are ensured, and the microscale solid powder and the particles are sufficiently dispersed and mixed in the materials.

The invention discloses a service fault early warning system. The system comprises: a key information acquisition module; a key information summarizing and analyzing module which comprises a state information real-time receiving, analyzing and storing module and an abnormal event analyzing, forming and alarming pushing module; an alarm strategy management module which comprises a short message retransmission strategy configuration module and a shutdown maintenance period configuration module; a user group management module which comprises a target user group management module and a user operation log storage auditing module; a short message quick sending module which comprises a specified type timing sending module and an in-information number list quick sending module; and a service operation state and historical alarm information query statistics module which comprises a retrieval result chart display and result export module and a historical data backup and recovery module. The system is seamlessly integrated with various service modules in an interface file mode, and is convenient to use; the timeliness and the space coverage of alarm information pushing are ensured; accurate delivery of early warning information is realized; and the service operation and maintenance efficiency is improved.

The invention relates to an intelligently driven temperature-controlled heating and dehumidifying electric shoe stretcher, which improves the design of the existing shoe stretch structure, introduces an intelligently driven temperature control mechanism, and designs a first pressure sensor (5) and a second pressure sensor (6) respectively. ), in the case of realizing the intelligent detection function, intelligent control is realized for the miniature electronically controlled telescopic rod (7) between the front support of the shoe (1) and the back support of the upper of the shoe (2). Under the telescopic control of the upper telescopic rod, the change of the distance between the upper support (1) and the upper support (2) is realized, which can efficiently adapt to shoes of various sizes; at the same time, based on the designed humidity sensor (11), the internal environment of the shoe Humidity detection, combined with the design of the specific heating circuit (12), realizes the joint intelligent control of the designed micro-fan (9) and the electric heater body (13), and realizes the heating of the environment inside the shoe while preventing deformation of the shoe Dehumidification operation.

The invention relates to an intelligent electrically-controlled driven shoe with front and rear air cushions. By structural improvement of existing shoes, a front cavity (8) in a front sole area and a rear cavity (9) in a rear sole area are designed in a sole (2) made of a soft rubber material; aiming at the designed two cavity structures, an electrically-controlled air flow distribution mechanism is adopted, foot movements are detected by a first pressure sensor (6) and a second pressure sensor (7), and intelligent accurate regulation of air in the two cavities is realized through a designed miniature two-way air pump (5) on the basis of a specifically designed motor drive circuit (10). Better foot support can be provided for a wearer, and effective protection is realized aiming at feet of the wearer.

The invention relates to an intelligent filtering and heating dehumidification type electric shoe stretcher. Aiming at an existing shoe stretcher structure, an improved design is carried out and an intelligent filtering detection electric control mechanism is introduced; a first pressure sensor (5) and a second pressure sensor (6) are designed respectively, and a specifically designed filtering circuit (12) is combined, so that intelligent control is realized aiming at a designed mini-type electric control telescopic pole (7) is realized under the condition of realizing the intelligent detection effect; under the telescoping of a telescopic pole on the mini-type electric control telescopic pole (7), the change of a distance between a vamp front support (1) and an upper rear support (2) is realized, so that the intelligent filtering and heating dehumidification type electric shoe stretcher can be effectively adaptive to shoes with various sizes; meanwhile, based on a designed humidity sensor (13), the filtering circuit (12) is matched and used for detecting the humidity of environments in the shoes, and furthermore, intelligent control is realized by common work of a designed mini-type fan (9) and an electric heater body (11), so that heating dehumidification operation on the environments in the shoes is realized when the shoes are prevented from deformation.

The invention discloses a reserve parallel connection method of automotive electronic equipment. The reserve parallel connection method comprises the following steps: determining the demand reliability of a system according to the safety requirements for the automotive electronic equipment and calculating the reliability of modules and the system reliability of the automotive electronic equipment after reserve parallel connection; fusing the failure rate of each module into the system reliability and establishing a reserve parallel connection reliability design model of the electronic equipment through taking the reliability of the automotive electronic equipment as a satisfied condition based on development cost and minimum size; obtaining the relation between the reserve parallel connection quantity of the modules and the demand reliability; establishing an evaluation optimization model based on index variable factor weighing; solving the reserve parallel connection reliability design model based on the index variable factor weighing and obtaining an optimized reserve parallel connection scheme of the automotive electronic equipment. According to the method disclosed by the invention, the reliability of the automotive electronic equipment is truly guaranteed, and meanwhile, both the cost and the space are saved.

The invention relates to a slidable socket which includes a first jack module and a second jack module, the first jack module includes a backboard which extends upwardly, and the second jack module is connected with the backboard in a slidable way via a chute arranged in the backboard. The slidable socket can solve the problem that multiple plugs cannot be plugged into the socket simultaneously due to too small spacing between different jacks, ensures that the occupation space of the socket is minimized, provides USB interfaces, and thus, has more functions.

The invention belongs to the field of aero-engine external pipeline design, and particularly relates to a pipeline connecting device with multidirectional displacement compensation capability. The pipeline connecting device comprises a first pipeline, wherein one end of the first pipeline is a columnar port, the outer wall is an outer cylindrical surface, and the tail end protrudes to form a flange; a second pipeline, wherein one end of the second pipeline is a spherical port; and a connecting pipe which comprises a first sleeve opening and a second sleeve opening, wherein the first sleeve opening sleeves the first pipeline, an elastic O-shaped ring is arranged between the first sleeve opening and the outer cylindrical surface, the second sleeve opening sleeves the second pipeline, the position, corresponding to the spherical port of the second pipeline, of the second sleeve opening is in a horn shape, and a first connecting piece and the connecting pipe are matched in shape to clamp the elastic O- shaped ring. Through the integrated design of axial compensation and angular compensation, the compensation requirements of the pipeline in all directions can be met while the sealing performance is guaranteed; and the pipeline connecting device has the advantages of a simple structure, small occupied space and strong compensation capability.

The invention relates to an intelligent driving type electric control shoe stretcher. The improvement design is performed aiming at an existing shoe stretcher structure, and wherein an intelligent driving electric control mechanism is introduced; under a real-time intelligent detecting function of a first pressure sensor (5) and a second pressure sensor (6) which are separately designed at the front part and the rear part of the shoe stretcher, a miniature electric control telescopic rod (7) between a vamp front stretcher (1) and an upper rear stretcher (2) is accurately and intelligently controlled by a specifically-designed motor driving circuit (9); under telescopicextending-retracting control for on an upper telescopic rod onf the miniature electric control telescopic rod (7), the change of the distance between the vamp front stretcher (1) and the upper rear stretcher (2) is realized, and shoes of all sizes can be efficiently adapted; better working efficiency is realized, and the deformation of shoes is prevented.

The invention discloses a 'high-dimensional data anonymous processing method integrated with generalization and hidden surface removal', which is used for anonymously processing high-dimensional data and providing safety protection for an information sharing process, and aims to solve problems of extremely high information loss, difficulty in explaining processing results or performance defects and the like of an existing method due to high sparsity of high-dimensional data. The high-dimensional data are anonymously processed by means of integrating generalization and hidden surface removal, three innovative technologies including a top-down greedy search method, a minimum security thread identification method and a multi-cycle solving strategy are provided, accordingly, the novel high-dimensional data anonymous processing method is designed, information loss is effectively reduced, effectiveness of the data is guaranteed, and time efficiency and spatial scalability are realized. In addition, the effectiveness of the data processed by the method is greatly higher than three reference methods, and performances of the method are also superior to those of two of the three reference methods and are only lower than the other reference method with the lowest effectiveness of data. In addition, the data processed by the method can be analyzed by the aid of a standard data mining tool, and have a wide application prospect in network massive data sharing.

The invention discloses an easily cleaned heat absorber for a linear Fresnel heat collecting system. The easily cleaned heat absorber comprises a heat collection pipe, a secondary reflection mirror and upright posts used for supporting the heat absorber, wherein a guide rail is laid in the length direction of the heat absorber; the guide rail is laid on a supporting object used for fixing the secondary reflection mirror or the heat collection pipe; a base capable of sliding along the guide rail is arranged on the guide rail; a cleaning head capable of stretching into the place around a cleaning surface of the heat absorber is arranged on the base; and the cleaning head is connected with a cleaning solution storage tank through a connecting pipe. According to the easily cleaned heat absorber, through the guide rail mounted on a heat absorber structure and the cleaning head fixed to the base, the relative fixation of the cleaning head and a to-be-cleaned surface is guaranteed; and the distance between the cleaning head and the to-be-cleaned surface is short, so that a cleaning solution is saved while a relatively good cleaning effect is achieved, and other structures of the heat absorber are not liable to damage.

The invention relates to a separated tunnel high-definition video detection system and method, the tunnel detection system is composed of a high-definition video acquisition aircraft and a big data storage detection vehicle, devices are connected in real time and stored in real time through a short-distance communication module, and working parameters during detection can be adjusted in real timeaccording to tunnel diversity and environmental variability.

The invention discloses a quenching furnace for tubular parts. The quenching furnace comprises a furnace body, wherein a cavity is formed in the furnace body, the two opposite side walls of the furnace body are provided with an inlet and an outlet which are used for allowing the part to be treated to penetrate through, a clamping unit, a cleaning unit, a first drying unit, a heating unit, a cooling unit and a second drying unit are sequentially arranged in the furnace body according to procedures, the furnace body inlet corresponds to the clamping unit, and the second drying unit corresponds to the furnace body outlet; a power unit comprises a motor, and the motor provides power for the clamping unit, the cleaning unit, the first drying unit, the cooling unit and the second drying unit atthe same time; the heating unit is electrically connected with a power supply; and the clamping unit can reciprocate in the moving direction of the part to be treated and complete the clamping and loosening functions of the part to be treated. According to the quenching furnace, a part is clamped by the clamping unit to move forwards, the part is subjected to cleaning, primary drying, heating, cooling and secondary drying, the tubular part is quenched and dried, and high practicability is achieved.

The invention discloses an air-operated machine, and relates to the field of industrial machinery. The air-operated machine comprises a fan shaft and blades. The fan shaft is a long and straight cylindrical rod and is provided with a disc type driver, the disc type driver is connected with a supporting frame composed of three fan blades arranged at equal intervals, the clockwise circumference offset angle between every two adjacent fan blades is 28-32 degrees, and the three fan blades of the supporting frame are sequentially and perpendicularly connected with the blades. The blades are bent long plates with the wing-typed sections, and the circumference angle between every two adjacent blades is 119-121 degrees. An output shaft is arranged at the lower end of the fan shaft. The disc type driver can provide driving force for self-starting of the blades. Due to the wing type design and perpendicular connection of the blades, air resistance in the rotation process can be reduced, the lift force can be increased, the maximum linear speed output is guaranteed, and high output power can be provided. In addition, the structure is simple, and the reliability is high.

The invention provides a train which comprises a train body, wherein a plurality of mounting slots are formed in the inner surface of the train body; the multiple mounting slots are optionally used for mounting a sliding plug door or a containing door. Mounting connection openings for mounting the containing door and the sliding plug door are considered, and simultaneously, the space occupied by moving travels of two door systems can be guaranteed; the mounting slots for mounting the sliding plug door and the containing door are formed in the train body, so that the sliding plug door and the containing door are more convenient to mount, and the cost for producing the train is effectively reduced.

The invention provides a time-frequency domain analysis aero-engine remaining service life prediction model method and device, and relates to the technical field of aero-engine service life prediction and health management. Comprising the following steps: preprocessing aero-engine sensor data, carrying out continuous wavelet transform to obtain time-frequency domain characteristics, and constructing network input from three dimensions of time, a sensor and the time-frequency domain characteristics; and establishing and training a 3DConLSTM neural network to obtain an output result, namely prediction of the remaining service life. According to the method, continuous wavelet transform is introduced, and historical data of the aero-engine are analyzed in a time domain and a time-frequency domain respectively. The characteristics of the LSTM network are adopted, three gating units control inflow of information, and the long-term degradation trend of time sequence data is reserved; according to the method, dot product operation in a traditional LSTM network is changed into convolution operation, features among three-dimensional inputs are effectively extracted, time sequence and spatiality of data are considered, the residual service life prediction result is more accurate, and the residual service life prediction precision is improved.

The invention discloses an anti-seismic support for fixing a heat-preservation pipeline and a non-heat-preservation pipeline. The anti-seismic support comprises a first steel channel, a second steel channel, pipe bundles, heat-preservation pipe bundles, a double-face steel channel and a third steel channel. Steel channel buckles are arranged on the two side walls, close to the ends of one sides, of the first steel channel and the second steel channel, the steel channel buckles are fixed to the surface wall of a concrete beam through expansion bolts, and the ends of the other sides of the first steel channel and the second steel channel stretch in the direction away from the concrete beam. The third steel channel and the double-face steel channel are connected with the first steel channel and the second steel channel through right-angle connecting pieces, the double-face steel channel is located above the third steel channel, the heat-preservation pipe bundles are arranged on the upper end face of the double-face steel channel, the pipe bundles are arranged on the lower end face of the double-face steel channel, and the pipe bundles are arranged on the upper end face of the third steel channel. Thus, compared with the prior art, on the premise of guaranteeing that the heat-preservation pipeline does not interfere with the non-heat-preservation pipeline, the situation of occupation of space and increase of the work amount can be avoided.

The invention discloses a liquid filtering and degassing integration device, which relates to the technical field of degassing devices. The liquid filtering and degassing integration device comprises a tower body, a gas outlet, a liquid inlet A and a liquid inlet B which are in the upper portion of the tower body, a filter tank assembly inside the tower body, a lower liquid storage tank in the tower body, a liquid level gauge connected with the liquid storage tank and a liquid outlet below the tower body, wherein the filter tank assembly comprises a plurality of filter tanks connected side by side, a filter layer is arranged in each filter tank, the bottom of each filter tank is provided with a plurality of spray heads for scattering liquid, and the liquid inlet A and the liquid inlet B are respectively connected with the filter tanks on two ends of the filter tank assembly. A filter apparatus and a degassing apparatus of the traditional degassing apparatus are independent apparatuses and necessarily have respective pumping power, and a temporary storage tank is needed between the filter apparatus and the degassing apparatus when the filter apparatus and the degassing apparatu are connected with each other. The liquid filtering and degassing integration device has the advantages of simplicity in structure, integration of filtering and degassing, and sufficiency in space utilization.

The invention relates to an intelligent detection motor-driven dehumidification electric shoe stretcher, which improves the design of the existing shoe stretch structure, introduces an intelligent detection electronic control mechanism, and designs a first pressure sensor (5) and a second pressure sensor (6) respectively. ), in the case of realizing the intelligent detection function, through the specifically designed motor drive circuit (12), the miniature electronically controlled telescopic rod (7) between the upper support (1) and the upper support (2) realizes intelligent Control, under the telescopic control of the telescopic rod on the miniature electronically controlled telescopic rod (7), the change of the distance between the upper support (1) and the upper rear support (2) can be realized, which can efficiently adapt to shoes of various sizes; at the same time Based on the detection of the humidity inside the shoes by the designed humidity sensor (11), the designed miniature fan (9) works intelligently to realize the dehumidification operation for the environment inside the shoes while preventing deformation of the shoes.

The invention discloses an air inlet automatic control engine. The air inlet automatic control engine comprises an engine body and an automatic control air inlet system, an air inlet of the engine body is in communication with an air outlet of the automatic control air inlet system, an air inlet of the automatic control system is provided with a connecting cavity and a sensor, the connecting cavity is connected with a natural gas inlet pipe and / or an air pressurizer, and the sensor is connected with an air pressurizer through a controller in the automatic control air inlet system. The automatic control system has the advantages that automatic control of an engine air inlet system is achieved, and the negative pressure air inlet phenomenon is effectively eliminated; the air inlet pressure and the temperature are ensured to be stable; the air inlet flow is synchronously changed along with the oil inlet flow, so that the engine achieves high-efficiency, energy-saving and environment-friendly operation levels; the tail gas emission is lower than the emission standard, so that the problem of black smoke of a diesel engine is effectively solved; high-pressure steam is generated by a heatexchanger, a double-gas-drive steam turbine and a turbocharger increase the power, so that the risk of high-temperature inflammability of the turbocharger is eliminated and the rotating speed of theturbocharger is controlled.