175results about How to "Easy to solve" patented technology

The utility model provides a kind of multistage anti-seismic explosion-proof valve and manufacturing method.The multistage anti-seismic explosion-proof valve of the utility model includes the body of sheet shape, the body edge is explosion-proof valve ring, the middle part of the body is thinning area and the thickness size of thinning area is less than the thickness size of explosion-proof valve ring, the reinforcing rib with the strength of the place can be improved is had at thinning area, the score with annular recess is had on thinning area close to its edge, annular recess buffer groove is had between thinning area and explosion-proof valve ring and buffer groove position explosion-proof valve ring and score, the reinforcing rib includes reinforcing frame in the middle part of thinning area and reinforcing strip at the both ends of frame body.The multistage anti-seismic explosion-proof valve of the utility model can be stably welded and installed on battery cover plate.

This utility model discloses a vertical waste material coiling device for a slitting machine, including a frame. Two parallel feeding rollers are located on the upper part of the frame, and a coiling roller is located below the frame. A waste material tension adjusting mechanism is located between the coiling roller and the feeding rollers on the frame. The waste material tension adjusting mechanism is mounted on a horizontal frame on the frame. The horizontal frame has a through groove for transverse movement. A sliding block is located within the through groove and slides along it. A rotating roller is mounted on the sliding block. Limiting blocks are located on both sides of the sliding block within the through groove. A spring is mounted on one side of the sliding block and the through groove. This utility model dynamically adjusts the rotation speed of the coiling roller to avoid speed mismatch that could cause pulling on the steel coil during slitting.

The utility model discloses an additive adding assembly for organic fertilizer production, and belongs to the technical field of organic fertilizer production. The auxiliary agent adding assembly comprises a tank body and a feeding port formed in the tank body, an auxiliary agent adding port is formed in the side face of the feeding port, a supporting cylinder is arranged on the outer side of the auxiliary agent adding port, and the auxiliary agent adding assembly further comprises a feeding cylinder arranged in the auxiliary agent adding port; the baffle plate is arranged at the bottom of the feeding cylinder and is positioned in the tank body; and the feeding cylinder is movably clamped on the supporting cylinder, so that the feeding cylinder can slide up and down relative to the supporting cylinder during use. The feeding cylinder is used for feeding used auxiliaries into the tank body in the organic fertilizer generation process; the feeding cylinder is arranged in a manner of sliding up and down relative to the supporting cylinder, so that the feeding cylinder can be moved down to a proper position when the auxiliary agent is fed, the fed auxiliary agent is prevented from being raised and adhered to the inner wall of the top of the tank body during falling, waste is avoided, and the fermentation generation of organic fertilizer is also influenced.

The utility model discloses vacuum plating structure and vacuum plating equipment, vacuum plating structure includes: two transition chambers, be located between two transition chambers's plating chamber and be used for conveying transmission mechanism of carrier plate, transmission mechanism is located in the transition chamber, and transmission mechanism of one transition chamber conveys carrier plate to transmission mechanism of another transition chamber, so that the area of carrier plate in plating chamber is completely suspended. Transmission mechanism contains a plurality of transmission wheel groups that are arranged at intervals along the carrier plate conveying direction, and the transmission wheel group is composed of a pair of transmission wheels arranged oppositely, and the carrier plate comprises a plate body and two transmission edge frames respectively arranged on both sides of the plate body, the inner top surface of the transmission edge frame is a transmission surface, the transmission surface is placed on the transmission wheel, and the bottom of the transmission edge frame is an open mouth that is downwardly open. The utility model can reduce the film layer deposition of transmission wheel, reduce the probability of dust generated due to transmission transportation, and effectively improve the uniformity of substrate plating.

The application provides an air exhaust device, an air conditioning fresh air control method and device, an air conditioner and a storage medium. The air exhaust device comprises: an air exhaust body, wherein the air exhaust body is provided with a buoyancy channel; the buoyancy channel is provided with an outdoor air port for communicating with outdoor airflow and an indoor air port for communicating with indoor airflow; the buoyancy channel is provided with a first air pressure buoyancy piece, the first air pressure buoyancy piece slides in the buoyancy channel, and the first air pressure buoyancy piece is provided with an air exhaust channel; when the first air pressure buoyancy piece is located at a first position, the air exhaust channel is in communication with indoor airflow and outdoor airflow respectively, indoor exhaust is realized to reduce indoor pressure, and further, when the air exhaust device detects that the fresh air conditioner adjusts the fresh air fan in combination with indoor air quality control when indoor exhaust is performed, the air conditioner is prevented from increasing work, indoor and outdoor pressure differences are balanced, and user comfort is improved.

The utility model discloses crushing equipment for recycling automobile plastic parts, and relates to the technical field of automobile plastic part recycling. The device comprises a crushing box, the upper surface of the crushing box is fixedly connected with a feeding hopper communicated with the interior of the crushing box, the lower surface of the crushing box is fixedly connected with a discharging barrel communicated with the interior of the crushing box, and the outer surfaces of the left side and the right side of the crushing box are fixedly connected with supporting bases; and the crushing mechanism is used for crushing the automobile plastic parts so that the automobile plastic parts can be recycled, a vertical pipe is fixedly connected to the surface of the front side of the crushing box, a dust collecting mechanism is arranged on the vertical pipe, and the dust collecting mechanism communicates with the interior of the feeding hopper. According to the crushing equipment for recycling the automobile plastic parts, operation is convenient when dust is discharged, the dust does not need to be disassembled by climbing to the top of the crushing box, more labor is saved, and then the practicability of the crushing equipment for recycling the automobile plastic parts is improved.

A transformer partial discharge positioning detection method based on ultrahigh frequency signals is characterized by comprising the following steps: S1, estimating time delay of signals obtained by an ultrahigh frequency (UHF) sensor array based on a generalized cross-correlation method; and S2, arranging and combining signals of the UHF sensor array, and solving coordinates of a positioning point based on an improved multi-moth optimization (MFO) algorithm according to the time delay obtained in the step S1. And S3, clustering the coordinates of the plurality of positioning points obtained in the step S2 based on a density clustering algorithm (DBSCAN), and selecting the geometric center position of the category with the maximum sample number as the final local discharge source coordinate.

The application discloses a kind of soft soil shield water tunnel composite structure internal force simplified calculation method, comprising the following steps: 1) based on national standard specification and the tunnel overburden soil weight of corresponding geological exploration report of engineering is calculated;2) the underlying soil is simplified into several linear grounding springs connected with water tunnel;3) based on the equivalent stiffness theory of composite beam structure, the equivalent bending stiffness and equivalent shear stiffness of shield water tunnel composite structure are calculated;4) shield water tunnel composite structure is simplified into a continuous homogeneous ironwood Xinke beam in longitudinal direction;5) take microelement dx to carry out stress analysis, and the control equation of simplified model of composite structure is obtained;6) the numerical solution of control equation is solved using finite difference method;7) the numerical solution vector is functionally coupled using Fourier series;8) the internal force of any point on shield water tunnel composite structure is solved.

The present application belongs to the technical field of mesh quality optimization of three-dimensional tetrahedral mesh generation, and relates to a three-dimensional mesh quality optimization method based on Wolfe criterion modified Newton method. The present application firstly performs initial finite element modeling on a target aircraft to obtain mesh information, then marks the current mesh as an initial mesh, determines mesh element quality measurement criteria and an objective function, marks low-quality mesh elements as poor-quality elements, and respectively constructs local optimization domains; the local optimization domains are optimized by using the Wolfe criterion-based modified Newton method to obtain high-quality meshes. The present application uses the reciprocal of the radius ratio and as the objective function to calculate the optimal mesh node positions of the entire local optimization domain, ensuring the calculation convergence and constraint integrity of the entire local optimization domain, reducing the calculation amount while achieving a higher optimization rate under the condition of ensuring robustness, and finally realizing mesh quality optimization with high robustness and high optimization rate.

This invention discloses a method for eliminating moss growth on macadamia nut leaves, relating to the field of agricultural planting technology. The specific method involves spraying a moss-removing agent onto the macadamia nut leaves during the moss occurrence period, applying moss inhibitor I to the main stem, and applying moss inhibitor II to the soil surface around the main stem. The moss-removing agent comprises the following raw materials in parts by weight: 40-50 parts of allicin, 15-24 parts of urea, 5-18 parts of calcium propionate, 20-27 parts of calcium sulfate, 10-17 parts of calcium chloride, 20-35 parts of vegetable oil, 1-10 parts of titanium dioxide, 1-5 parts of glutathione, and 1-3 parts of dispersant. This invention solves the problems of slow effectiveness, short duration of action, and low plant safety in current macadamia nut leaf moss control methods, achieving highly efficient control.

The utility model discloses a water injection device and bread machine relates to household appliance technical field, including box and lid, be equipped with container in the box, and the one side of container has the water tank of detachable installation in the box, and the water tank has the communicating pipe. The lid pivoted connection is in the top of box, and the lid has the annular setting water injection pipe, and the communicating pipe communicates the water injection pipe, and the water injection pipe is equipped with a plurality of water injection holes to the side wall of container, and a plurality of water injection holes interval setting along the length direction of water injection pipe. At the same time, along the radial of container, the water injection hole is close to the inner peripheral wall of container. When injecting water, water from the water tank enters the water injection pipe through the communicating pipe, and the water injection pipe injects water through a plurality of water injection holes arranged in a ring, thereby forming the annular water curtain close to the inner peripheral wall of container, can avoid the flour dust to lift and leave the container in the water injection process, reduces the raw material waste, reduces the flour accumulation in the box interior, to reduce the cleaning difficulty.

The application provides a filter pipeline automatic flushing and pressure regulating method, which can automatically identify the blockage of a filter and corresponding pipeline and automatically clean the filter without removing the filter from a pipeline system, thereby avoiding the risk of adding extra substances in the pipeline system, and particularly reducing the risk of water vapor entering a liquid oxygen and liquid methane pipeline system. The filter pipeline automatic flushing and pressure regulating method can also compensate for the pressure loss of fluid after passing through the filter, solve the problem of pressure difference before and after the filter, and meet the test scene with strict requirements on fluid pressure loss. All functions of the method can be automatically controlled, which greatly shortens the operation time, saves the labor cost, and reduces the possibility of adding extra substances in the pipeline system.

This invention discloses a method for preparing pentaerythritol oleate based on sodium bisulfite. The method involves the esterification reaction of pentaerythritol and oleic acid with sodium bisulfite as an auxiliary agent. Sodium bisulfite, as an auxiliary agent, possesses both catalytic and antioxidant functions, effectively improving the reaction rate and product yield while suppressing oxidation side reactions. This eliminates the need for additional antioxidants, improving product quality and reducing costs. The preparation method is simple, mild, and environmentally friendly, with readily available raw materials, low-cost auxiliary agents, and easy separation. After the reaction, the catalyst is removed by hot filtration, and unreacted oleic acid is removed by solvent extraction, effectively reducing the product's acid value. The extracted potassium oleate byproduct has a purity of 80%–90% and can be used as a flotation agent, release agent, or raw material for lubricant production, making it suitable for industrial applications. The resulting pentaerythritol oil is suitable for high-end lubricants, bio-based plasticizers, and environmentally friendly coatings.

The invention discloses a cabin relative pose measurement method based on non-cooperative assembly characteristics, and the method employs a displacement sensor and a visual camera to form a double-sided measurement device, synchronously measures the assembly characteristics of a cabin, calculates and decouples the relative poses of six degrees of freedom, and provides a basis for pose adjustment assembly. According to the method, heterogeneous measurement data fusion and coordinate system unification of the displacement sensor and the visual camera are achieved, mutual decoupling and synchronous posture adjustment of six degrees of freedom can be achieved, the posture adjustment convergence rate is increased, and the assembly efficiency can be effectively improved.

According to the spraying dust removal device capable of leveling the land and used for the construction site, a first leveling mechanism and a second leveling mechanism are arranged, the ground is pressed through a pressing roller ring at the tail of a vehicle plate, vibration pressing boxes compact the two sides of the vehicle plate under the action of a vibration motor, and due to the fact that the two ends of the pressing roller ring and the two vibration pressing boxes are staggered in the range, the two sides of the vehicle plate are tightly pressed; therefore, the road surface can be fully leveled, dust in the air is mixed with water and falls on the ground under the action of the fog gun machine in the reciprocating motion process of the tricycle main body, the purpose of road leveling is achieved through the pressing and compacting action of the pressing roller ring and the vibration box, and the problems that an existing fog gun machine can only carry out dust falling treatment on raised dust, and the road surface cannot be leveled easily are effectively solved. The problems that the road cannot be leveled, dust on the road can be raised repeatedly when the engineering vehicle runs, and dust raising cannot be restrained are solved.

The invention discloses salt baked flavor chicken energy chewable tablets and a preparation method thereof, and belongs to the technical field of food processing. The chewable tablet consists of the following components in percentage by weight: 20-40 parts of salt roasted chicken powder, 25-50 parts of an energy supplement, 0.1-0.5 part of composite vitamins, 10-30 parts of an excipient, 0.5-2 parts of a flavoring agent, 0.1-0.5 part of an antioxidant, 1-3 parts of magnesium stearate and the balance of deionized water. The salt-baked chicken powder is prepared by taking chicken breast as a raw material, rolling, kneading and pickling with a salt-baked flavor pickling solution, steaming, drying and pulverizing. According to the invention, the salt baked flavor and the nutrition of chicken are combined, the salty and fragrant flavor and balanced nutrition are combined, rapid and lasting energy supplementation can be realized, the chewable tablet is portable to eat, is subjected to dry granulation, low-temperature sterilization and aluminum foil packaging, has long shelf life, adopts a natural flavoring agent, is high in safety, and is suitable for various energy supplementation scenes such as sports, offices, outdoors and the like.

The application discloses a kind of second-order multi-agent system under network prediction realizes inclusive control method and system, it is related to networked multi-agent system technical field.The technical points of the present application include: establishing discrete-time second-order multi-agent system dynamic model with network delay and data packet loss;State prediction is carried out according to the dynamic model to establish prediction model;Predictive controller is designed using the predicted state obtained by prediction model;The expression of position estimation error and speed estimation error is obtained by substituting predictive controller into the dynamic model;The feedback gain constant of predictive controller and the condition that sampling period satisfies are obtained by solving position estimation error and speed estimation error;The feedback gain constant that satisfies condition is substituted into the predictive controller designed, and inclusive control is realized using predictive controller.The present application overcomes the influence of communication delay and data packet loss on inclusive control, with the advantages of easy solution, easy implementation, etc.

This invention discloses a rotor blade of a segmented stacked axial compressor and its design method. The design method includes: determining the axial position of the stacking line; determining the circumferential position of the stacking line: the stacking line is S-shaped in the circumferential direction, and the stacking line includes four control points A, B, C, and D sequentially from the blade root to the blade tip along the height direction; the coordinates of the centroid positions of each basic airfoil section in the first interval from point B to point C conform to a specific formula; and determining the shape of the stacking line based on the determined axial and circumferential positions. This invention, by setting the stacking line of the rotor blade to be S-shaped in the circumferential direction, generates a reverse pressure gradient in the radial direction, causing the gas at both ends to migrate towards the blade center, thereby improving the flow in the end region. This reduces the influence of secondary flow in the blade tip region; and by setting a specific function, the circumferential offset of the stacking line can be controlled by constructing a simple equation, improving the computational efficiency of optimizing the airfoil.

The present application belongs to the technical field of quorum quenching enzyme preparation, and particularly relates to a multi-target quorum quenching enzyme preparation and a preparation method and application thereof, such as being mainly used for inhibiting the virulence factors of Pseudomonas aeruginosa, and including acyl homoserine lactone acyltransferase AiiO protein and 3-hydroxy-4-oxoquinolone 2,4-dioxygenase AqdC protein, and the mass ratio of the two is 20:(1-25); such as being mainly used for inhibiting the virulence factors and the synthesis of biological membranes of Pseudomonas aeruginosa, and further including deferiprone, and the mass ratio of AiiO, AqdC and deferiprone is 20:(1-25):(0.695-2.78), the present application can target the Las, Rhl and PQS of Pseudomonas aeruginosa, the yield and stability of the prepared AqdC protein are both high, the two types of enzymes are used in combination after the regulation amount, and the virulence factors regulated by different quorum sensing pathways in Pseudomonas aeruginosa are effectively inhibited; the regulation amount of deferiprone is used in combination with the two types of quorum quenching enzymes, and the virulence and biological membranes of Pseudomonas aeruginosa can be effectively inhibited in a comprehensive manner.

A belt retainer roller has a plurality of rollers and a retainer (2) that retains the rollers. The retainer (2) includes a pair of annular members (4) facing both axial ends of each roller, and a plurality of column portions (5) that are disposed at equal intervals in the circumferential direction across the outer diameter portions of the pair of annular members (4) for the rollers to be fitted into. An inner diameter portion of each annular member (4) is provided with a roller retaining claw (6) for preventing the rollers from falling toward the inner diameter side of the retainer. A retainer radial chamfer length (B) and a retainer wall thickness (A) satisfy the following relationship: 0 < B / A ≤ 1.6.

The utility model discloses an air conditioner case partition board mounting and positioning structure, including case, partition board, evaporimeter, the case includes bottom plate and two opposite first side panels of setting, and the both ends of bottom plate correspond with the lower end connection of two first side panels, the partition board lower extreme is provided with the second positioning portion, and the partition board has the lap joint portion, and the lower end of lap joint portion is provided with the positioning slot of downward opening, and one end of evaporimeter has the first end panel, and the first end panel is fixedly connected with one first side panel, and the lower end of first end panel is provided with the first positioning portion, and the first positioning portion is upwardly protruding and is provided with the limiting portion, and the first positioning portion is embedded in the positioning slot, and the limiting portion and first end panel mutually cooperate and hold the lower end of lap joint portion, and the upper end of lap joint portion and the upper end fixed connection of first end panel, and the second positioning portion is fixedly connected with bottom plate. The air conditioner case partition board mounting and positioning structure provided by the utility model can make the partition board assembly more convenient, improve the assembly efficiency of partition board.

The invention belongs to the technical field of inter-satellite laser link establishment pointing, and provides an inter-satellite laser link establishment pointing method and system suitable for a low-orbit mobile communication constellation in order to solve the problem that an existing azimuth angle and pitch angle pointing technology based on an east-north-sky coordinate system has defects. According to an inter-satellite laser communication ephemeris mutual transmission mechanism, a mathematical model of inter-satellite laser link establishment angle pointing requirements is established, and azimuth angle and pitch angle calculation formulas of laser link establishment of two adjacent satellites in a constellation orbital plane, satellites in the orbital plane and satellites in two adjacent orbital planes are deduced. On one hand, by introducing an orbital coordinate system, an inter-satellite azimuth angle and a pitch angle are defined; on the other hand, a mathematical model of an inter-satellite laser link establishment pointing angle is obtained based on a positioning orbit determination ephemeris data source of an on-satellite GPS. And the inter-satellite laser link establishment pointing technology can be realized through a two-dimensional rotating mechanism of the laser. The method can be widely applied to an inter-satellite laser link establishment pointing scene of a low-orbit mobile communication constellation.

The utility model belongs to the technical field of cut tobacco production, and discloses a blanking cover, a blanking device and airflow cut tobacco drying equipment. The blanking cover comprises a body, a cover plate and a heating assembly. Wherein the body is provided with a cavity for materials to pass through; the cover plates are detachably connected with the body, the cover plates are annularly arranged on the outer wall of the body, and an interlayer space is formed between the cover plates and the body; the heating assembly comprises a heating pipe, at least part of the heating pipe is arranged in a circuitous and reciprocating mode along the outer wall of the body, the heating pipe is detachably connected with the outer wall of the body and / or the inner wall of the cover plate, at least part of the heating pipe is located in the interlayer space, and the heating pipe is used for heating the cavity. According to the utility model, the problems that wet tobacco powder is easy to adhere to the inner wall of the blanking cover and the risk of quality defect of yellow spot tobacco exists in production can be solved, meanwhile, the complexity and the cost of the structure are reduced, and the process quality is improved.

This utility model relates to the field of building water supply, drainage and fire protection design technology, and discloses a fire pump anti-air accumulation connection pipeline. Its features include a fire pump, a fire water tank, a main suction pipe, a branch suction pipe, and an eccentric reducing tee. The eccentric reducing tee includes a main tee and a branch tee, with their inner tops flush. One end of the main suction pipe is located in the fire water tank, and the other end is connected to the main tee. The other end of the main tee is connected to an external pipe network. The branch suction pipe is connected to the branch tee, and the other end is connected to the inlet of the fire pump. A quick-connect fitting is provided at the end of the branch suction pipe connected to the fire pump, and a quick-connect secondary pipe is provided at the inlet of the fire pump. This utility model effectively prevents water pocket formation in the pipeline and allows for quick connection between the water pipe and the pump.

This application provides a circuit board and an electronic device, including a first reference layer and a second reference layer disposed opposite to each other along the thickness direction of the circuit board. At least two lead layers are located between the first and second reference layers. The circuit board also includes multiple lead units, with leads in the lead units located on different lead layers. The leads in each lead unit extend along a first direction, and the leads in each lead unit are staggered along the first direction so that the projections of the leads on the first reference layer are staggered. The first direction is either the length direction or the width direction of the circuit board. This application provides a circuit board that can achieve complete circuits for signals in leads located on different lead layers without adding reference layers, thereby reducing the cost of the circuit board.

Provided is a method of manufacturing a composite optical ceramic element including a first ceramic section and a second ceramic section joined to the first ceramic section. The method includes: a first process of preparing a first powder that contains a first transition element and is for the first ceramic section, and a second powder that is different from the first powder in a concentration of the first transition element and is for the second ceramic section; and a second process of disposing the first powder in a first region, disposing the second powder in a second region adjacent to the first region, and bringing the first powder and the second powder into contact with each other at a boundary portion between the first region and the second region to form a contacting state after the first process.

The application provides a green, low-carbon and rapid chromium-containing wastewater treatment method, which is improved on the basis of traditional biogas residue and ferrous sulfate treatment of chromium-containing wastewater, introduces short-term micro-aeration technology, and produces unexpected results, which not only treats the chromium-containing wastewater in a green and low-carbon way, but also greatly speeds up the reaction progress. In the process, a certain thickness of biogas residue sediment layer is formed in the biochemical reaction tank, then ferrous sulfate is added, then chromium-containing wastewater and biogas liquid are added, and after standing for a period of time, micro-aeration is carried out, which accelerates the biochemical reduction of Cr(VI) in the chromium-containing wastewater, promotes the activity of microorganisms, and saves resources.

The invention relates to a pyrolysis plant comprising, among other things: a) a heated exhaust feeding device including at least: a receiving hopper (101); a drive (103); a photoelectric sensor or a paddle switch (104); a sliding door (106); a twin-screw feeder (102); a pneumatic or hydraulic feeding system (121); a heating collar (111); b) a reactor including at least: an upper reactor tube (107a) and a lower reactor screw (107b) with double-threaded screws; enclosed heating boxes (601) having a burner (108) per box; a steel tube frame (608) having flat bearings (606) for the trolleys (605); c) a rotary screen cleaning tower consisting at least of: a fan wheel (705); spinning paddles (704); screen plates (703); a cleaner tower case (713); a main shaft (727);and an electric motor (714) with a gearbox (706); (d) a thermal exhaust fuel scrubber consisting of at least: a main scrubber housing (1004); an inlet tube (1003); a slotted insulated metal enclosure (1005); duct fittings (1008 and 1009); a relief valve (1010); a relief tank (1011); a pump (1001); a bypass valve (1027); a vent pipe (1013); a condenser (1015); a storage tank (1021); an actuation valve (1006); sensors (1016 / 1017); and a check valve (1028); (e) a carbon refiner consisting of at least: a screw conveyor (107b); an airlock arrangement with a door, an upper door (1302); an ash removal auger (1301); a first hopper (1303); a level indicator (1304); a drive (1305); a middle door (1306); a hopper (1307); a lower door (1308); a metering screw (1309) rotating in a housing (1310);corresponding ventilation openings; a duct (1316); a burner fan (1311); a combustion chamber (1312); a pilot flame (1314); a discharge opening (1322); a motor drive inverter (1317); an extended seal (1318); a burner fan (1311); a ventilation line (1319); a water bubbler (1320); a vacuum source (1321); a separator tank (1323); a level switch (1325); a vertical lifting auger (1328); an opening (1329); openings (1330) in the lifting tube (1331); a horizontal auger (1335); a pyrolysis burner housing (601); an inline condenser (1334); an auger (1335); an airlock (1336); a cyclone (1338); an airlock (1339); a fan (1340); an exhaust (1346) in a baghouse filter (1341); and an airlock (1343); f) a safety burner tower consisting of at least: a control valve (1701);a pipe (1702) and a safety burner housing base (1703); a fan (1708); a venturi nozzle (1707); a pilot light (1714); a bubble chamber (1719); having an isolated zone (1711); a computer (1718); a battery (1709); a backup battery (1717); a level control (1705).