58results about How to "Way to achieve" patented technology

The invention relates to a bus taking system based on a mobile phone client, wherein the bus taking system comprises an on-bus intelligent device and the mobile phone client. The bus taking system is characterized in that the on-bus intelligent device comprises an on-bus intelligent device housing and a processor; and the processor is connected with a capacitive touch display screen, a wireless communication device, a voice recognition broadcast device, an alarm device, a camera, a human face recognition device, a global positioning system (GPS) positioning device, a currency recognition and storage device, a card reader and a power supply device. The mobile phone client is provided with a real-time bus client program which has a function of helping a passenger to complete a bus-taking function and can realize data communication among the mobile phone client, the bus and a bus background server. The bus taking system has an advantage of integrating functions of positioning, bus line querying, on-bus passenger traffic querying, station arrival time querying, bus evaluating, self-service ticket buying, etc. Furthermore the bus taking system has advantages of reducing time in getting on the bus by the passenger, and improving operation efficiency of the bus.

The invention provides a comprehensive testing platform of an intelligent brake system. The testing platform comprises a vehicle brake system, a measuring control system, an operating platform and a network system, wherein the operating platform is provided with a brake controller, a standby brake controller, an emergency button, a parking switch and a CCU (central control unit); the brake controller outputs three ways of signals, one way is connected with an emergency loop, one way is connected with a brake instruction loop, and another way is connected with the network system through the CCU, and the three ways of signals are all connected with the measuring control system; the output signal of the parking switch is connected with the parking brake loop; the signal of the parking brake loop is connected to a straight brake controller; the emergency button is connected in the emergency loop; a brake main pipe is connected with the standby brake controller and an automatic brake control device in parallel; a BCU (Brake Control Unit) is connected with the emergency loop, the brake instruction loop and the network system; one output is connected with the brake controller; and the other output is connected with an anti-sliding exhaust valve; and the output of an air supply system is connected with a main air pipe and is connected with the brake controller. The platform is used for vehicle brake simulation test.

The invention provides a search and rescue positioning terminal based on an AIS and a Beidou navigation satellite system. The search and rescue positioning terminal comprises a core processing module, a GNSS module, an AIS transmitter module and a Beidou short message receiving and dispatching module. The core processing module is used for controlling the work of the search and rescue positioning terminal. The GNSS module is connected with the core processing module and used for positioning the search and rescue positioning terminal through a satellite so as to acquire positioning data. The AIS transmitter module is connected with the core processing module and used for packaging the positioning data into standard AIS information to be emitted. The Beidou short message receiving and dispatching module is connected with the core processing module and used for packaging the positioning data into a Beidou short message to be emitted. The invention further provides a search and rescue positioning method based on the AIS and the Beidou navigation satellite system. According to the search and rescue positioning terminal and method based on the AIS and the Beidou navigation satellite system, the AIS and the Beidou navigation satellite system are combined to be used according to personal aquatic search and rescue, the problems of long-distance and short-distance continuous warning and positioning search and rescue are effectively solved, and the search and rescue efficiency is improved.

The invention discloses a cloud based BIM collaborative design platform which comprises an application end and a cloud data server. The platform is characterized by also comprising a Hongye collaborative design platform, both the application end and the cloud data server are connected with the Hongye collaborative design platform, and the Hongye collaborative design platform includes project management, resource management, collaborative design, light browsing and Hongye cybertalk. Model data is obtained to a local server via a BIMSpacer, cloud projection information is synchronized, Revit self collaboration is replaced, and a local server collaborative data processing plus cloud data management and model browsing mode is realized.

The invention discloses a centralized heating and cooling combined system with an energy storage tank. The centralized heating and cooling combined system can be used for stabilizing energy load, reducing installed capacity, lowering great regulation needed by reduction of load changes, improving economical efficiency and improving the reserve capacity of the centralized heating or cooling system by virtue of energy storage action of the large energy storage tank under low load, and energy release action of the large energy storage tank under high load. The centralized heating and cooling combined system with the energy storage tank is characterized by comprising an energy storage tank which is connected to a heat source heating network heat supply system through a first pump valve pipeline, wherein the energy storage tank is further connected to a cold source cooling network cold supply system through a second pump valve pipeline.

The invention discloses a human face identification charging method. The method includes acquiring a first identification result of a first human face image when a vehicle draws up at a station and saving the first identification result as an arrival charging basis of the vehicle; acquiring a second identification result of a second human face image when the vehicle leaves the station and saving the second identification result as a leaving charging basis of the vehicle; matching the first identification result with the second identification result; when the first identification result is matched with the second identification result successfully, charging the vehicle according to the arrival charging basis and the leaving charging basis. The invention also discloses a human face identification charging device and a computer readable storage medium. According to the invention, through the human face identification based smart and safe charging method for the vehicle, the work load of fee collectors is reduced, fee collection time is saved and fee collection efficiency is improved.

The invention relates to the field of daily emergency help seeking, and more specifically relates to a one-click help seeking method and platform based on a mobile intelligent terminal. The one-clickhelp seeking method comprises the step that a help seeker performs a one-click operation on a one-click help seeking button, sends help seeking information to an associated person corresponding to thehelp seeking button. According to the invention, association with a preset group is established through a one-click simple operating method, wherein the preset group comprises departments or objectsfor rescue. The one-click help seeking platform is preset with government rescue departments (public security 110, fire alarm 119, hospital 120, traffic 122 and emergency office), regional rescue scopes (nearby people groups, a community groups, city groups, interprovincial groups and national groups), public welfare rescue organizations, family groups and friend groups, thereby realizing a one-click interconnected help seeking and rescuing mode from the individual level to the government level, the group level, the family level, the regional level and the like.

The invention relates to the technical field of coal mine down-hole comprehensive digging face temporary supporting, in particular to a novel temporary supporting device for a coal mine roadway comprehensive digging face. The novel temporary supporting device comprises a left supporting mechanism, a right supporting mechanism, a front supporting leg, a rear supporting leg, a front beam and a telescopic beam. The left supporting mechanism and the right supporting mechanism are integrally connected with a pin shaft through connecting transverse beams, the front beam and a protecting head on beam, and the structure of the left supporting mechanism is the same with that of the right supporting mechanism, and the left supporting mechanism and the right supporting mechanism comprise a base, a guiding beam, vertical pillars and top beams. The vertical pillars are fixed to the base, the top beams are arranged at the tops of the vertical pillars, and a sliding rail is arranged in the base. The front supporting leg and the rear supporting leg are integrally connected through the sliding rail. A supporting top longitudinal beam is arranged on the connecting transverse beams, the connecting transverse beams are fixed to the top beams, and the supporting top longitudinal beam is connected with the telescopic beam through a telescopic oil cylinder. The telescopic beam and the front beam are connected through a front beam jack, the front beam and the protecting head on beam are integrally connected through a protecting head on beam jack, and a pushing oil cylinder is arranged between the base and the front supporting leg. According to the novel temporary supporting device for the coal mine roadway comprehensive digging face, the supporting procedures are simplified.

The invention discloses a wired and wireless integrated fetal monitor. The wired and wireless integrated fetal monitor comprises a wireless monitoring probe, a monitoring host and a pluggable connector. The wireless monitoring probe is connected to the monitoring host through the pluggable connector, the pluggable connector is provided with first pogo pins, and the wireless monitoring probe is provided with connection contacts corresponding to the first pogo pins; and the monitoring host is provided with a plurality of magnetic connection seats, and the magnetic connection seats are provided with second pogo pins corresponding to the connection contacts. The wired and wireless integrated fetal monitor can be flexibly switched between wired and wireless connection states, and can better realize stable and long-term uninterrupted fetal monitoring work.

The invention belongs to the technical field of temporary supports of comprehensive tunneling faces under coal mine shafts and particularly relates to repeated-free-support temporary support equipment. The repeated-free-support temporary support equipment comprises an inner support group and an outer support group, the inner support group is arranged on the inner side of the outer support group and comprises two left and right inner supports, the inner supports have two inner supports on the inner left and right sides connected integrally through a cantilever beam of the inner support group and an intermediate support beam, and the cantilever beam of the inner support group is connected to two ends of the inner supports in a hinged manner; the outer support group comprises two left and right outer supports, the outer supports have two outer supports on the outer left and right sides connected integrally through a cantilever beam of the outer support group and an intermediate support beam, and the cantilever beam of the outer supports are connected to two ends of the outer supports of the outer supports in a hinged manner. By the arrangement, repeated-free support of a top plate and full cross-section active-support top plate can be realized, support process is simplified, a continuous operation mode that tunneling, temporary support and permanent anchor protection are performed synchronously is realized, and potential safety hazard of operation personnel under a suspending roof is avoided.

The embodiments of the invention relate to the technical field of communication, and disclose a playing method, a playing device and a terminal. The playing method, which is applied to the terminal, includes the following steps: acquiring to-be-played content edited by a user; determining that the to-be-played content is allowed to be played; and after the terminal is in communication connection with an electronic advertisement screen, sending the to-be-played content to the electronic advertisement screen so the electronic advertisement screen can play the advertisement content, wherein the electronic advertisement screen is provided with a shared access, the electronic advertisement screen is in communication connection with an owner in advance, the shared access is used to establish communication connection between the electronic advertisement screen on one hand and the terminal and a server on the other hand, and the server is used for managing shared electronic advertisement screens. According to the invention, electronic advertisement screens are combined with the sharing economy, and the utilization rate of electronic advertisement screens is improved. Moreover, the problemof low audit efficiency caused by separate audit is avoided, unnecessary human resources are saved, and great convenience is brought to users.

The invention discloses a real-time imaging simulation system for unmanned photoelectric equipment. The real-time imaging simulation system comprises a management and control module and an embedded imaging simulation device; the management and control module is used for generating three-dimensional geometry, texture and spectrum coupled multi-characteristic scene data, generating texture data of atmospheric elements including solar irradiance, sky irradiance, sky atmosphere downlink transmittance, atmosphere uplink transmittance and up-stroke radiation covering typical weather, sky hours and wave bands and incident irradiance light field data of a target scene, and sending the texture data and the incident irradiance light field data to the embedded imaging simulation device; the embeddedimaging simulation device is used for acquiring position and posture information of unmanned photoelectric equipment, respectively querying and obtaining characterization spectral parameters and uplink atmospheric parameter data based on a bidirectional reflection function according to the position and attitude of a platform, generating a zero meteorological sight distance exit radiance field andan exit radiation field in front of an entrance pupil through GPU parallel acceleration calculation, and generating simulation image data with a camera effect.

The invention discloses a short-wave channel unit with a broadband and narrow band capable of being flexibly configured and a multi-channel monitoring receiver. The short-wave channel unit comprises amode selection circuit, a first switch, a narrow-band signal processing circuit, a second switch and a universal signal processing circuit. The multi-channel monitoring receiver comprises an antennacombiner, first to Nth short wave channel units, a reference shunt module, a multi-channel sampling module, a receiving processing unit and a monitoring processing unit. According to the receiver, a multi-system signal monitoring technology, a broadband and narrowband combined monitoring technology and a multi-channel monitoring technology are adopted to realize the broadband and narrowband flexible configuration receiver. The device has the characteristics of simple equipment, reliable performance, low cost, good electromagnetic compatibility and the like.

The invention relates to the technical field of ophthalmologic operation auxiliary equipment, in particular to an improved hand placing table for an ophthalmologic operation. The improved hand placingtable comprises two parallel bases, wherein two parallel universal wheels are fixedly connected to the bottom surfaces of the bases through bolts, a pull rod is arranged between the two bases, and pipe bodies are mounted on the top surfaces of the bases. A sliding cavity is formed in the top surface of each of the pipe bodies, a fixing plate is mounted at the position close to the top end, between the two pipe bodies, a threaded hole is formed in the center of the fixing plate, and two through holes are symmetrically formed in two sides of the threaded hole. According to the improved hand placing table for the ophthalmologic operation, the height of the fixing base can be conveniently adjusted through a height adjusting mechanism which is arranged, and therefore the arm of a patient can be better placed on the fixing base; the fixing base, an elbow support, a wrist support and the like are arranged, so that the elbow part and the wrist part of the patient are conveniently and effectively supported; and a wrist fixing mechanism is arranged, so that the wrist can be conveniently and quickly fixed, and the operation can be conveniently and smoothly performed.

The invention discloses a CNC predictive maintenance system and method based on machine learning, and the system comprises a CNC state monitoring system which is used for collecting and monitoring theoperation state data of a numerical control machine tool and the production process data of a workpiece, and transmitting the information data to a CNC service cloud platform through a data transmission network; a data transmission network which is used for sending the acquired data to the CNC service cloud platform through wireless communication modes such as WiFi, ZigBee and GPRS; a CNC servicecloud platform which is used for storing, modeling and analyzing the acquired data; and a mobile terminal which is used for displaying the acquired data and the analysis result on the smart phone andthe tablet personal computer. The invention further discloses a CNC predictive maintenance method based on machine learning. The CNC predictive maintenance method comprises the following steps of S1,CNC data collecting and transmitting; S2, data storage; S3, data analysis and processing; and S4, data pushing. According to the method, predictive maintenance of the CNC equipment is facilitated, the detection accuracy is improved, and accidents are avoided.

The invention discloses a method and a system for automatically generating a special equipment inspection report based on a form model, belongs to the technical field of special equipment, and aims to solve the technical problem of how to quickly obtain a special equipment inspection report and improve the detection efficiency. According to the technical scheme, the method specifically comprises the following steps: establishing an inspection report sub-template library; configuring an association relationship between the report sub-template library and the inspection type; carrying out visual automatic configuration on an inspection report by an inspector; carrying out intelligent convergence of a configured form; gathering the form to automatically associate with a configuration file to generate a printing template; and generating a report. The system comprises an item management establishment module, a configuration module, a sub-template library establishment module, a first association relationship configuration module, a second association relationship configuration module, a visual automatic configuration module, an intelligent convergence module, a printing template generation module, an original record generation module and a report generation module. A device comprises a mobile terminal and an approval terminal.

The invention discloses an acoustic resonance generation device. The acoustic resonance generation device comprises an outer shell, a base, a loudspeaker, an enclosed sound box frame, a Helmholtz acoustic resonator, a bolt, a ceramic generation module, a rectifying output circuit, an audio driving circuit, an input panel and an output panel, wherein the base is covered with the outer shell; the loudspeaker is fixed to the base through the enclosed sound box frame; the Helmholtz acoustic resonator is suspended above the loudspeaker through the bolt; the ceramic generation module is attached toan outer surface of the Helmholtz acoustic resonator; and the rectifying output circuit and the audio driving circuit are arranged on the base. Through adoption of the acoustic resonance generation device provided by the invention, a corresponding larger-mass resonator is excited to vibrate with small acoustic energy according to the acoustic resonance principle, and the vibration potential energyof the resonator is converted into electric energy, thereby realizing a novel energy utilization and conversion manner, and providing continual power support for production and life.

The invention discloses a double-linked-bag packaging production line, and relates to the field of packaging equipment. The double-linked-bag packaging production line comprises a machine frame, and the machine frame comprises a product feeding part, a double-station bagging mechanism and a finished product conveying part which are connected in sequence; the product feeding part comprises an eye patch conveyor and an eyeshade conveyor which are arranged side by side, eyeshade production equipment used for feeding is connected to the starting end of the eyeshade conveyor, and an automatic eye patch taking machine used for feeding is connected to the starting end of the eye patch conveyor; the eye pad conveyor and the eyeshade conveyor each comprise a storage plate, an inserting mechanism and an adsorption mechanism, the storage plates are arranged on the machine frame, and a conveying mechanism used for conveying the eyeshade and a discharging opening matched with the eyeshade are arranged on the storage plates; the inserting mechanism comprises a first driving mechanism and an inserting strip in transmission connection with the first driving mechanism, and the inserting strip is located above the discharging opening; and the adsorption mechanism is arranged below the discharging opening, so that various bagging combination functions can be realized, different bagging requirements are met, and meanwhile, a dry and wet separated filling and filling mode can be realized.

The invention discloses an intelligent work staring and control visual management system, which is applied to a processing assembly line and comprises an integrated central control platform (1), a plurality of sensing detection modules (2), a mobile auxiliary detection end (3) and an abnormity alarm center (4), the integrated central control platform (1) is respectively in data communication connection with the plurality of sensing detection modules (2), the mobile auxiliary detection terminal (3) and the abnormity alarm center (4) to realize data communication and manipulation control; according to the intelligent work staring and control visual management system and management method, a mode of combining big data calculation is adopted, key highlighting and key attention are performed, arrangement of monitoring sensing equipment can be reduced, and intelligent management efficiency and monitoring cost are improved.

The invention relates to a manual-automatic winding type filter. The filter comprises a filter material bracket for supporting filter materials, a driven filter material reel and a driving filter material reel are installed at the upper and lower ends of the filter material bracket, the driving filter material reel is connected with a drive part through a clutch, the drive part is in a meshing transmission connection with a drive motor, and a handle is arranged on the driven filter material reel. According to the filter, the filter material reels are separated from the drive part under an outage condition through the clutch, and therefore the winding type filter can be used normally through manual operation.

The invention belongs to the field of real object exhibition platforms, and discloses a real object exhibition platform convenient for 360-degree full-angle shooting to solve the problem that according to an existing shooting real object exhibition platform, a camera is fixed to the position above the exhibition platform or fixed at some fixed angle, and the viewing angle of the camera is changed difficultly. The real object exhibition platform comprises a power source, a control circuit, a fixing support arm, two steering engines, a horizontal rotating support arm, a vertical rotating support arm, a camera and a real object exhibition platform body. One steering engine is hoisted on the fixing support arm and rotationally connected with one end of the horizontal rotating support arm, the other end of the horizontal rotating support arm is fixedly connected with the other steering engine, the other steering engine is rotationally connected with one end of the vertical rotating support arm, and the other end of the vertical rotating support arm is fixedly connected with the camera. The power source is used for providing working voltage for the control circuit, and the control circuit is used for controlling the two steering engines to work. The real object exhibition platform is mainly used for exhibiting real objects.

The invention relates to the technical field of supply, and discloses a circular tray suppler capable of achieving a circular supply effect. The circular tray suppler comprises a worktable provided with a first guide area and a second guide area in parallel in the vertical direction, multiple material discs stacked in the first guide area and the second guide area, a first transfer module arrangedat the upper end of the worktable, a second transfer module arranged at the bottom of the worktable, a third transfer module arranged in the first guide area, and a fourth transfer module arranged inthe second guide area. A vacancy at the upper end of the first guide area is used as an unloading station; a vacancy at the upper end of the second guide area is used as a loading station; actions ofthe first, second, third and fourth transfer modules are matched to circularly shift the material discs between the first and second guide areas to realize the modes of circular supply and automaticfixed-point supply; and the work in the unloading station cannot be influenced during supplying, so that the labor intensity of workers is effectively relieved, and the production efficiency is improved.

The invention discloses a water tank water level real-time regulation and control system with a safety alarm function and belongs to the technical field of water tank water level regulation and control. The system comprises a monitoring unit, an output terminal of the monitoring unit is electrically connected with an input terminal of a data acquisition module, an output terminal of the data acquisition module is electrically connected with an input terminal of a control unit, and the control unit is bidirectionally and electrically connected with a data storage module. According to the watertank water level real-time regulation and control system with a safety alarm function, the monitoring unit, a comparison module, a feedback module and a forecasting unit are arranged; a measuring andreporting unit can effectively display the information in image-text display and voice broadcast modes and thus the related personnel are effectively reminded to carry out emergency treatment in time;even if the water tank shakes due to the influence of external factors, the related personnel can conveniently and accurately carry out judgment according to information transmitted in real time, sothat the monitoring accuracy is improved while the working intensity is reduced, and the system is high in applicability.

The invention provides a difunctional tremor instrument for relieving non-tumor mechanical intestinal obstruction and promoting peristalsis, and relates to the technical field of tremor massage equipment. The difunctional tremor instrument for relieving the non-tumor mechanical intestinal obstruction and promoting the peristalsis comprises a main body, a placing cavity is formed in the main body, a partition plate is fixedly connected to the interior of the placing cavity, and a servo motor is fixedly connected to the inner side wall of the placing cavity and located on the front side of the partition plate; the output end of the servo motor is fixedly connected with a speed regulator, the output end of the speed regulator extends into the partition plate and is fixedly connected with a rotary disc, and the rotary disc is movably connected with the partition plate. And the rear surface of the main body is fixedly connected with dustproof cloth. The device is simple and reasonable in structure, the defects in the prior art can be well overcome, the transverse and longitudinal bidirectional massage mode on the abdomen of a patient is effectively achieved, and the diversity of the tremor massage mode is improved.

The invention discloses a power distribution network load rapid transfer auxiliary decision-making system based on a PI database, and aims to overcome the problems that the data query process is complicated, the number of query systems is large, the number of repeated query systems is large, and the compilation efficiency of an operation mode is seriously influenced when a load transfer scheme is compiled in the prior art. The system comprises a PI database and a PB interface connected with the PI database. According to the system, a PI real-time database is utilized, a 10kV line contact mode and line and main transformer limit condition table is established, a real-time data display and historical trend chart query function in the PI database is utilized, various factors required by load transfer are integrated, a function of querying a superimposed load historical trend chart of a related contact line is provided, and by using the system, the time for formulating a scheme in a scheduling service can be greatly shortened, the working efficiency is improved, and safe and stable operation of a power distribution network is facilitated.

The invention discloses a novel chemical skin penetration enhancer containing a cholic acid group, which is prepared by reacting cholic acid with polyethylene glycol. A medicine composite can be prepared by mixing the enhancer with a medicine and a medicine carrier; and a patch, an ointment, gel or cream can be prepared. The enhancer is odorless, can be dissolved in most organic solvents or water, has no obvious toxicity to a cell, represents amphipathy, and has an obvious penetration enhancement effect on the medicine.

The invention discloses a somatosensory type library resource database system and method, and aims at the problem of an existing library that the three-dimensional storage of rare resources can not bestored so as to lose a great quantity of rare resources along with time. A holographic image is generated, holographic image data is obtained, human body induction control information is obtained bylight and is fused to the holographic image, and the holographic image data is called according to human body induction, and a target holographic image is reconstructed, detected and generated according to the holographic image data. By use of the method, an advanced holographic technology is imported to realize the storage diversification and generalization of library information storage, meanwhile, the brand-new storage way and control way of the library can be realized, the experience of a user is improved, and the problem in the prior art that a great quantity of precious resources are lost along with time since the library can not realize the three-dimensional storage of the precious resources is solved. The method is suitable for the field of intelligent libraries.

The invention discloses a DMD-based imaging pre-processing device and a DMD-based pre-imaging processing method. The DMD-based pre-imaging processing device comprises a CCD, a first lens group, a DMD, a second lens group, a DSP and an object space working surface. Spatial one-to-one correspondence between micro mirror-image elements in the DMD and CCD pixels is realized, and coordinate corresponding relation imaging of the CCD and the DMD and corresponding relation imaging of the DMD and the object space working surface are performed, and therefore, the pre-imaging processing device can process incident light before imaging. According to the DMD-based imaging pre-processing device and method of the invention, the focus of the work of image processing is shifted from post-imaging to an optical path of pre-imaging; and corresponding imaging of the CCD and the DMD is utilized, such that the gray range index of an imaging gray histogram can be increased, and therefore, the dynamic range of an imaging system can be expanded. With the DMD-based imaging pre-processing device and method of invention adopted, defects in environmental lighting and a field of view can be eliminated, and imaging quality and visual expressivity of an object can be improved. The DMD-based imaging pre-processing device and method of the invention can be widely applied in fields such as industrial inspection, medical imaging and astronomical observation.

A satellite-borne telephoto large-aperture antenna whole-star layout and deployment design method belongs to the field of space-borne large-scale deployable antennas. This method mainly includes the following steps: 1) Preinstall the reflective surface in the expanded state on the entire star according to the input conditions; 2) Translate the reflective surface, and determine the layout method according to the size relationship; 4) Optimize the length of the deployment arm and the transfer arm, and determine the position of the reflector and the feed array; 5) Check the field of view of the antenna; 6) Determine the reflector of the antenna and the deployment mode of the deployment arm. The calculation method of the invention is simple and effective, and the way of unfolding the reflective surface is given in detail.

The invention provides an amphibious operation method of an intelligent robot; in order to solve the positioning and communication problems existing in underwater operation of the intelligent robot in a shallow sea area, a GNSS / SINS (Global Navigation Satellite System / Strapdown Inertial Navigation System) integrated positioning method is combined with a robot operation movement process, operation is carried out through water surface and underwater amphibious circulation, traversal search is carried out in the underwater process by virtue of inertial positioning navigation. The water surface process receives external signals to carry out accurate positioning and communication, incremental correction is carried out on initialization parameters of the cyclic process through underwater motion data, and cyclic operation is carried out in the cycle, so that autonomy and flexibility of the intelligent robot can be kept, and the underwater traversal search operation requirement can be met.