2700 results about "Structural component" patented technology

The invention relates to the technical field of engineering management and control, in particular to an electric power engineering construction management and control method and system based on digital twinning. The method comprises the following steps: acquiring heterogeneous sensing data of a construction area, and carrying out dynamic modeling on a structural member to obtain a member-level digital twin grid; performing environmental factor-material performance response coupling based on the component-level digital twin grid to obtain a material environmental response distribution diagram; component environment sensitivity dynamic injection is carried out according to the component-level digital twin grids, and a construction process dynamic map is obtained; performing multi-mode construction state field deduction based on the construction process dynamic map to obtain a construction state evolution distribution field; and performing reversible process scheduling optimization and simulation according to the construction state evolution distribution map to obtain a reversible scheduling optimization map. The efficiency of electric power engineering construction and the resource utilization rate can be improved.

Provided is a high-strength steel sheet having excellent member strength, ductility, stretch flangeability, bendability of a shear end surface, and low-temperature toughness. A high-strength steel sheet having a prescribed component composition and a steel structure in which the area ratio of martensite is 10%-80%, the area ratio of bainite is 2%-70%, the area ratio of ferrite is 80% or less, and the area ratio of retained austenite is 15% or less at a position at 1 / 4 of the sheet thickness. The ratio of the number of martensite blocks in which metastable carbides are present relative to the number of martensite blocks is 2% or more, and the standard deviation [sigma] n of the nano-hardness relative to the average value [Hn] ave of the nano-hardness is 0.60 x [Hn] ave or less when the nano-hardness at 225 points or more is measured at a position of 1 / 4 of the sheet thickness.

The invention discloses a power monitoring regulation and control system and method used in the operation process of a ship lock miter gate, and relates to the technical field of ship locks. The method comprises the following steps: firstly, monitoring the vibration state of each structural member of the ship lock miter gate, calculating a rigidity evaluation value of the ship lock miter gate, adjusting an electric control signal of a proportioning pump according to the rigidity evaluation value, and optimizing the non-deformability of a gate body structure; secondly, the dynamic stress of the door body is monitored, the dynamic stress safety evaluation value of the ship lock miter gate is obtained, the output frequency of the motor is adjusted through the frequency converter, and structural overload can be avoided; and finally, the back pull rod prestress monitoring and adjusting module adjusts the prestress of the back pull rod in combination with the vibration state, the dynamic stress and other characteristic data, so that the stability and the structural safety of the door body are kept. Structural damage caused by excessive vibration or stress overload can be avoided, the service life of equipment is prolonged, and stable operation of a ship lock system is ensured.

The invention relates to the technical field of engineering mechanical structure health monitoring, and discloses a carry-scraper structural member crack real-time detection system and method based on vibration characteristics, and the carry-scraper structural member crack real-time detection system based on vibration characteristics comprises a sensing acquisition module which is used for acquiring structural member vibration response and obtaining an original signal; the signal processing module is used for carrying out wavelet denoising on the original signal and extracting effective vibration data; the feature extraction and dynamic calibration module is used for extracting multi-domain features and performing dynamic calibration in combination with working conditions; the crack recognition and intelligent diagnosis module is used for inputting an intelligent model to recognize a crack state; and the crack positioning and alarm feedback module is used for positioning cracks and giving an alarm in combination with the diagnosis result. According to the invention, the multi-modal sensor array is constructed, piezoelectric and MEMS sensors are cooperatively arranged, a magnetic snap-in type installation structure is combined, broadband response signals are stably collected under different working conditions, and then front-end signal optimization is completed in cooperation with a multi-scale wavelet denoising and standardization mechanism.

The invention relates to an additive manufacturing method and application of an aluminum-based silicon carbide composite material complex component, and the additive manufacturing method of the aluminum-based silicon carbide composite material complex component comprises the following steps: step 1, uniformly mixing silicon carbide powder and aluminum alloy powder, and drying; 2, establishing a structural model for the target part, and importing the structural model into selective laser melting forming equipment; thirdly, selective laser melting forming is conducted; fourthly, linear cutting and surface treatment are conducted; and fifthly, hot isostatic pressing treatment is conducted. The invention further provides application of the aluminum-based silicon carbide composite material complex component to precise structural components such as aviation structural components, guided missile and satellite components and optical instruments. According to the method, the problem of subsequent large-allowance removal of the aluminum-based silicon carbide composite material component is solved, the wettability between the aluminum alloy and the silicon carbide particles is improved, the mechanical property meets the application requirement, and the aluminum-based silicon carbide structural component with stable performance is obtained.

A structural component of a vehicle may include an elongated beam having a seamless outer wall surrounding a hollow interior area along the length of the beam. The outer wall defines a closed-cross-sectional shape along the length of the beam and may be comprised of at least four outer wall sections. The outer wall of the elongated beam may include plurality of channels protruding into the hollow interior area and extending laterally from an inboard side to an outboard side on at least one section of the outer wall of the elongated beam. The outer wall includes a flat surface spanning between each of the plurality of channels. The elongated beam may be comprised of an extruded aluminum, and the channels may be formed after extrusion in an orthogonal direction to the direction of extrusion.

The invention discloses a copper alloy and a preparation method and application thereof, and belongs to the technical field of alloys. The copper alloy comprises the components of Cu, Al, Cr, Zr, Ni, Mg, Ti, Si, rare earth elements, Zn and the like, through the innovative design of Al-Cr-Si oxidation film synergistic protection, Zr-Ti-Mg nanophase strengthening, rare earth grain boundary purification and the like of the copper alloy, the breakthrough improvement of the high-temperature strength, the complex corrosion resistance, the machining performance and the environmental protection performance is achieved through the combination of the low-burning-loss smelting, rapid solidification and multi-stage heat treatment processes, and the copper alloy can be used for manufacturing the high-temperature-resistant alloy. The copper alloy can be widely applied to the fields of aerospace high-temperature parts, ocean engineering corrosion-resistant structural parts, high-end die-casting dies and the like, and fills the blank of the existing copper alloy technology.

The utility model relates to a shielding connector main body in the technical field of electrical elements. The shielding connector main body comprises a shell, a shielding ring and a conducting ring, the shell is provided with a shielded wire port and a terminal port, a containing cavity is formed between the shielded wire port and the terminal port, and the containing cavity is provided with a structural body used for containing a shielded wire and being electrically connected with the wiring terminal; the shielding ring is embedded in the shell and is close to the shielding wire port, the inner circumferential surface and the outer circumferential surface of the shielding ring are exposed, the conducting ring is provided with a grounding block, the conducting ring is embedded in the shell and is close to the terminal port, and the outer circumferential surface of the conducting ring and the grounding end surface of the grounding block are exposed; the shell is made of resin materials, the shielding ring and the conducting ring are metal pieces, and the shell, the shielding ring and the conducting ring are integrally formed to form a shielding connector body. According to the shielded wire connector main body provided by the embodiment of the utility model, a metal shell structure in the prior art is changed into a resin material and metal ring integrated structure, the stability of the shielding ring and conductive ring structure can practically improve the shielding effect, and the shell and the shielding cover in the prior art are ingeniously integrated into a whole; structural components of the shielding connector are reduced, and the manufacturing cost of the shielding connector is greatly reduced.

To provide a multiaxial 3D printing device for metal structural components and an arc-based additive manufacturing method.SOLUTION: Based on a multiaxial coordinated printing mode of a robot arm device, a movable guide rail device, and a positioner device, expansion of a six-axis robot arm enables printing in a robot arm's free posture and moving a guide rail enables movable printing following an axis along the guide rail, an open motion space of the 3D printing robot is enlarged, a two-axis positioner allows achieving multiaxial 3D printing without support for complex metal structural components, reducing material costs, and simplifying post-processing. Simultaneously, linkage linear interpolation through a world coordinate system allows effective controlling printing accuracy and print accuracy and large-format dimensions and further achieving multiaxial 3D printing for large and complex metal structural components.SELECTED DRAWING: Figure 1

The invention discloses a single crystal turbine blade crystal orientation defect detection system based on adaptive optics, particularly relates to the field of nondestructive testing, and is used for solving the problem that thermal damage and signal consistency are difficult to consider in acoustic imaging of complex structural parts. Through partition energy threshold setting, dynamic pulse planning, photoacoustic processing and unified coordinate cross-subarea data synthesis, local thermal damage caused by excessive concentration of energy is effectively avoided in the material detection process, and the requirement for collecting high-bandwidth signals can be met in a large range. The signal-to-noise ratio and the detection efficiency are improved by regulating and controlling pulse energy and a scanning path, the amplitude comparability and the image coherence among regions are ensured through signal normalization correction and subregion image set splicing, high-resolution and comprehensive-coverage acoustic mapping is output, the crystal orientation defects of the single crystal turbine blade are positioned and evaluated, the detection precision is improved, the measurement period is shortened, and the method is suitable for large-scale popularization and application. And the method has an applicable value for aero-engine parts requiring rapid and high-precision nondestructive detection.

The invention discloses a burr polishing device for a high-strength automobile structural member, which belongs to the technical field of mechanical polishing and comprises a workbench and a workpiece, a machining table is arranged on the workbench, a motor and a liquid pipe are connected in the machining table, the output end of the motor is connected with a polishing head, and the burr polishing device further comprises a clamping mechanism and a detection mechanism which are arranged at the bottom of the machining table. In the polishing process, vibration transmission between the machining table and the machined part can be attenuated, chatter marks are reduced, and the surface smoothness is improved through elastic clamping of the second sliding block, the first sliding block and the third sliding block on the machined part, in the polishing process, the protruding degree of a polishing area is pre-detected through the detection block, and when the polishing head passes through the detection area subsequently, the polishing efficiency is improved. The rotating speed of the grinding head and the liquid spraying amount of the liquid pipe are adjusted through the transmission rod, self-adaptive automatic adjustment of the grinding head and the liquid pipe is achieved according to the pre-detection result of the machined part, and the grinding efficiency and the grinding work quality are guaranteed.

The invention provides a multi-order segmentation-based structural member linetype rapid identification method and system, and relates to the technical field of engineering structure intelligent detection, and the method comprises the steps: obtaining an original image of a structural member; performing coarse segmentation on the original image to generate an initial binary mask of the structural member; automatically screening out a target mask region containing a foreground prompt point through a connected domain analysis mode; calculating bounding box coordinate information of a bounding rectangle of the target mask region through a contour detection mode; extracting a corresponding target area sub-image from the original image; adopting a super-resolution reconstruction model to enhance the sub-image of the target area; performing sub-image division on the enhanced target area sub-image; fine segmentation is carried out on the sub-images, and a high-precision mask is determined; mapping the high-precision mask to an original image through coordinate mapping; and combining an edge detection algorithm to extract an outer contour line of the structural member to complete linetype identification of the structural member.

The invention discloses a high-temperature-irradiation-resistant zirconium alloy and a manufacturing method and a workpiece thereof, and belongs to the field of zirconium alloys. Wherein the zirconium alloy resistant to high temperature irradiation comprises the following components in percentage by weight: not less than 96% of Zr, 0.61%-1.4% of Sn, 0.41%-1.4% of Nb, 0.1%-0.5% of Fe, 0.11%-0.2% of O and 0.001%-0.3% of Cr; and from 0.015% to 0.03% of Si and / or from 0.001% to 0.06% of Ge; wherein Sn + Nb + O is greater than or equal to 1.5%, Fe / Cr is greater than or equal to 1.5%, Si + Ge is greater than or equal to 0.015%, and (Sn + Nb + O) / (Fe + Cr + Si + Ge) = 1.5-25.0. The alloy has good mechanical properties, corrosion resistance, creep resistance and radiation growth resistance, and is suitable for manufacturing of pressurized water reactor core structural members.

The invention belongs to the field of intelligent manufacturing and engineering design, and particularly relates to an industrial fan structure optimization design method and system based on AI assistance. According to the method, structural components of an industrial fan are modeled into a multi-node topological structure, a dual-channel performance prediction model is constructed, and the mapping relation between the structure and the performance is accurately established. On the basis, a comprehensive objective function is constructed, a boundary penalty mechanism is introduced, a virtual input parameter space is constructed in combination with a structure disturbance sample, a strategy gradient optimization method is adopted to carry out structure search and iterative optimization, and finally a structure scheme meeting boundary conditions and optimal performance is screened out through simulation verification. The system module comprises structure modeling, model training, objective function construction, disturbance generation, optimization execution, simulation verification and result output, and has the advantages of high structure identification precision, high optimization efficiency, strong engineering adaptability and the like.

A retrofitted bus featuring a progressive floor elevation system that gradually increases the height of modular flooring sections from front to rear, creating additional underfloor storage space and improving passenger visibility. The bus incorporates elevated passenger seating assemblies with rigid support structures and adjustable footrests for enhanced comfort and accessibility. The retrofitted stowage space may include insulation, climate control, and video monitoring systems. An engine safety cover, constructed from fire-resistant, thermally insulating, and structurally reinforced materials, integrates an extinguishing system for fire suppression. A swing-down egress mechanism at the rear of the bus serves as a structural component during normal operation and converts to an evacuation slide or stairs during emergencies.

The invention relates to the technical field of concrete structure damage detection, in particular to a post-fire RC structure burst damage three-dimensional segmentation method, which comprises the following steps: firstly, determining the type and three-dimensional characteristics of post-fire RC structure member surface concrete burst damage, and constructing a corresponding three-dimensional point cloud data set for network training and verification; and then based on a KP-FCNN network structure, a KPConv layer is improved and optimized, so that the detection and segmentation precision is improved, the model size is reduced, the reasoning time is remarkably shortened, the optimal segmentation precision of 82.3% is achieved under the working conditions of different damage degrees, automatic damage segmentation of the burst damage of the concrete structure after the fire disaster is realized, and the automatic damage segmentation of the burst damage of the concrete structure after the fire disaster is realized. And technical support is provided for subsequent damage three-dimensional quantification and deployment to an unmanned aerial vehicle system.

The invention discloses structural part welding equipment for bridge engineering construction, and relates to the technical field of welding equipment. The structural part welding equipment for bridge engineering construction comprises a portal frame, a chute is formed in the top of the chute plate, the chute inclines upwards in the process of being away from the portal frame, a supporting plate is slidably mounted at the chute of the chute plate, and the top of the supporting plate is a plane. When the positioning mechanism positions the plate and applies pressure to the plate obliquely and downwards, the bottom of the plate is tightly attached to the top of the supporting plate, and when the plate tends to slide relative to the supporting plate due to inertia of the plate or contact between the plates in the movement process, the friction force between the supporting plate and the plate can be reduced to the maximum degree. And the supporting plate tends to slide in a chute of the chute plate, so that the supporting plate applies pressure to the plate upwards, and the movement of the plate is limited in cooperation with obliquely downward pressure application of the positioning mechanism.

The invention discloses a method for rapidly evaluating the safety of a structure after a bridge fire, and the method comprises the steps: obtaining an air temperature, flue gas speed distribution, air pressure distribution and a flame flue gas image through simulating a fire scene; the method comprises the following steps: when simulating that a fire enters a fire quasi-steady-state stage, obtaining a fire smoke image for completely describing a dynamic change process of thermal plume and a smoke speed distribution image and an air pressure distribution image above a fire source, and forming a training sample; constructing a long and short term memory network model; training the model; shooting a flame smoke image of a fire scene, inputting the flame smoke image into the trained long-short term memory network model, and outputting a smoke speed distribution image; calculating a final fire source heat release rate according to the flame smoke image and the smoke speed distribution image; the average temperature of the components in the cable at different moments is calculated; according to the average temperature of the components in the cable at different moments, whether the structural components lose efficacy or not is judged. According to the invention, the monitoring accuracy and timeliness are improved.

A deck with improved construction components and methods may feature weather and UV resistant components which intermesh with each other in forming the finished deck product. The components, when assembled, will also feature a water diversion system that will direct water that falls on the deck surface, whether through precipitation or for cleaning purposes, and direct said water away from the foundation of the deck and the foundation of associated building. The diversion system features two tiers, an upper tier formed primarily from deck plank troughs (310) and wall transition planks troughs (630) and a lower tier formed from mullion troughs (410) and edge cap troughs (510) all in fluid communication with water ejection spouts (720).

The invention belongs to the technical field of material science, and relates to a generation method of a material formula, a target material, an automobile structural part, a vehicle, a device, a medium and electronic equipment. The method comprises the following steps: acquiring target performance data of a target material to be prepared; and inputting the target performance data into a pre-trained material large model, so that the material large model outputs formula data for preparing the target material and corresponding process data. The formula data and the process data of the preparation method are reversely deduced according to the target performance data required by the target material by utilizing the large material model, the large model is introduced into the field of material science, and the generation method of the reverse material formula realizing'target performance driving 'is provided without relying on a large number of manual experiment trials and errors; and the advantages of strong generalization ability and reasoning ability of the large material model are exerted, so that the research and development efficiency and success rate of new materials are improved, and the application scenarios of the large material model are enriched.

A releasable bracket for a headlight assembly of a vehicle includes: a fixed bracket portion configured to be attached to a structural component of the vehicle; and a component-side portion attached to the headlight assembly. The component-side portion is configured to engage the fixed bracket portion in a retained position for holding the headlight assembly to the structural component of the vehicle. One of the fixed bracket portion or the component-side portion includes a clip, and another one of the fixed bracket portion or the component-side portion includes a cage portion. The clip is configured to detach from the cage portion in response to application of an impact force on the headlight assembly. The clip is configured to re-engage the cage portion and to re-attach the fixed bracket portion to the cage portion after being detached therefrom.

The invention relates to the technical field of civil engineering and constructional engineering, in particular to a large-span structural member installation deviation intelligent evaluation method, which comprises the following steps of: calculating a difference value between an actual installation coordinate and a design coordinate of each rod member to obtain a coordinate deviation; the coordinate deviation is input into a first calculation and analysis model, and a first deformation response value of each rod piece is obtained; calculating a deformation response coefficient I of each rod piece in a self-weight state, and performing first-stage evaluation; applying an external load to the calculation analysis model II to obtain a deformation response value II and a load coordinate of each component; calculating a deformation response coefficient II of each component in a load state, calculating a difference value between a load coordinate and a design coordinate to obtain a finished deformation value, and performing second-stage evaluation; according to the results of the first-stage evaluation and the second-stage evaluation, judging whether the requirements are met or not; whether the deviation meets the requirement or not is judged through two-stage evaluation, potential safety hazards can be found in time, and structural safety and construction quality are guaranteed.

The invention relates to the technical field of welding automation, in particular to a quality sensing intelligent welding wire allowance monitoring system and method. According to the system, the total mass is detected in real time through a mass detection mechanism comprising a welding wire storage device, a weighing body and a plurality of force sensors, the mass of the remaining welding wires is accurately calculated through a controller according to pre-stored self-weight parameters, and then the remaining length is converted through welding wire specification parameters. According to the method, self-adaptive threshold early warning is achieved by comparing the remaining length with the required length calculated according to the next welding parameters, and the welding sequence can be automatically adjusted to optimize production. According to the method, the problems of interruption risk and resource waste caused by the fact that the allowance cannot be accurately measured due to the fact that the dead weight of the welding wire barrel is too large and estimation depends on experience in a traditional method are solved, real-time accurate monitoring of the allowance of the welding wire is achieved, welding continuity of important structural parts is guaranteed, material waste is remarkably reduced, and production efficiency is improved.

A system includes a structural member providing front and back faces, and first and second webs extending between the front and back faces and laterally offset from each other to define a hollow space therebetween. A wire transfer channel is defined at an end of the first web adjacent the front face and extends into the hollow space. A shear block provides a base, a connector portion extending from the base in a first direction, and first and second legs extending from the base in a second direction opposite the first direction, wherein the first and second legs are attachable to the first web to couple the shear block to the structural member.

The invention discloses a method for constructing a semi-analytical kinetic model containing pose parameters of a complete machine tool. The method comprises the following steps: S1, constructing a plurality of groups of pose machine tool three-dimensional models according to a machine tool pose parameter sample set and the positions of structural parts and joint parts in a space; s2, importing the multiple groups of pose machine tool three-dimensional models into a finite element system to perform modal reduction and structural member rigidity and mass matrix extraction to construct a structural member semi-analytical dynamic model; s3, constructing an agent model of a nonlinear mapping relation between the structural part semi-analysis dynamic model and the rigidity and mass matrixes corresponding to the structural part semi-analysis dynamic model according to the structural part semi-analysis dynamic model; s4, constructing a joint part contact stiffness model; and S5, establishing a dynamical model of the complete machine tool by adopting a structural component synthesis method. According to the method, the problem of rapid estimation of global dynamic characteristics can be effectively solved by performing dynamical modeling on the complete machine tool.

A structural component serves as a container for a vehicle. The structural component comprises a trough-shaped container section, an edge region, and fastening elements that are provided in the edge region. The container section forms a compartment and defines a bottom region and two or more wall regions, which are at least sectionally inclined with respect to the bottom region. The two or more wall regions are arranged between the bottom region and the edge region. The fastening elements are arranged and distributed around the container section. The container section and the edge region are formed of an injection moldable fiber reinforced thermoplastic material. The structural component at least sectionally has a porous internal structure that is formed by foaming the thermoplastic material.

The invention discloses a microdefect-containing high-temperature structure damage regulation and control method based on a dual-scale modeling method and a related device, and relates to the technical field of structural integrity evaluation and optimization of high-temperature alloy materials, and the method comprises the following steps: obtaining a plurality of alloy experiment samples subjected to standard heat treatment; the method comprises the following steps: establishing a macroscopic-microscopic dual-scale model based on an alloy experimental sample; mapping the macroscopic displacement field to a microscopic model in the macroscopic-microscopic dual-scale model, calculating a local plastic slippage cumulant, and taking a cumulative plastic slippage critical value as a fatigue failure criterion; based on the local plastic slippage cumulant and the cumulative plastic slippage critical value, defect parameter sensitivity evaluation is conducted on the alloy experiment sample, and the influence of the defect shape, the defect size and the defect position on the fatigue life is obtained; and carrying out surface gradient microstructure strengthening on the high-sensitivity area, optimizing a defect form through plastic deformation and transferring a damage accumulation position. The service life of the high-temperature structural part is remarkably prolonged.

The invention relates to the technical field of rubber materials, in particular to a high-strength and low-dielectric-loss epoxy resin composite material and a preparation method thereof. The epoxy resin composite material is prepared from the following raw materials in parts by weight: 100 parts of modified epoxy resin, 12 to 18 parts of cyanate ester resin, 40 to 50 parts of aramid fiber, 10 to 15 parts of filler, 15 to 25 parts of flexibilizer, 1 to 6 parts of first curing agent and 1 to 2 parts of accelerant. The epoxy resin composite material with high strength and low dielectric loss has the advantages of high strength, good impact resistance, high breakdown strength, low dielectric constant and low dielectric loss. The requirements of high-voltage power transmission equipment insulation parts, high-frequency circuit substrates, spacecraft lightweight structural members and the like on the fields with strict requirements on mechanical strength and dielectric properties can be met; and the preparation method is simple and controllable, the production cost is relatively low, and large-scale production can be realized.

The invention relates to the technical field of aluminum alloy materials, and provides a high-thermal-conductivity 6xxx aluminum alloy, a preparation method thereof and an electronic product structural part. Wherein the 6xxx aluminum alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of Mg, 0.2 to 0.35 percent of Si, 0.08 to 0.12 percent of Ce, less than or equal to 0.10 percent of Cu, less than or equal to 0.15 percent of Fe, less than or equal to 0.05 percent of Mn, less than or equal to 0.10 percent of Zn, less than or equal to 0.05 percent of Ti, less than or equal to 0.15 percent of total impurities and the balance of Al; and Mg / Si is in the range of 1.3 to 1.5. According to the 6xxx aluminum alloy and the preparation method thereof, the content and the mass ratio of Si and Mn are accurately regulated and controlled, meanwhile, a trace Ce element is added, the thermal conductivity and the anodic oxidation performance of the 6xxx aluminum alloy are improved, solid solution and aging processes are further matched, the beta ''phase and the grain size are controlled, and the alloy has the excellent anodic oxidation performance while having the high thermal conductivity.

The invention belongs to the field of metal materials, and particularly relates to 1430MPa-grade steel for passenger cars and a production method of the 1430MPa-grade steel, and the steel plate is mainly suitable for manufacturing passenger car structural parts. The steel comprises the following chemical components: C, Si, Mn, Al, Nb, V, Ta, Bi, Sb, W, Cr, Pt, Zr and Y, Al / Si is 1.0-2.0%, Ta + Zr is 0.040-0.048%, P is limited to be less than or equal to 0.015%, S is limited to be less than or equal to 0.005%, N is limited to be less than or equal to 0.006%, and the balance is Fe and inevitable impurities. The steel plate is obtained through the hot rolling, EPS, continuous annealing and finishing processes, the pickling and cold rolling processes are omitted, the technological process is simplified, and the environment is not polluted.