65results about How to "Master the operation" patented technology

The invention provides an extra high voltage transmission line online monitoring system, comprising that a data collection terminal collects comprehensive load, temperature of a transmission line, inclination angle of a pole, inclination angle of an insulator string, leakage current of the insulator string, meteorological information, vibration of transmission line and vibration of the pole, transmits the collected signals to a central data processing unit; the central data processing unit performs anti-interference process on each signals, packs and transmits to a background analysis device through a wireless communication network, and displays data information on a GIS electronic map; the background analysis device determines whether the transmission line is abnormal or not based on each signal and combination of mathematical model, transmits alarm information in time when being abnormal. The invention performs anti-interference process on the collected data, is capable of shielding interference of extra high voltage strong electromagnetic field and accurately monitoring working conditions of extra high voltage transmission line.

The invention discloses a method and a system for intelligently scheduling vehicles. The method comprises the following steps of: S1, acquiring real-time data information transmitted by intelligent terminals of vehicles by a web server; S2, receiving order information of passengers by a calling center server; S3, matching the order information of the passengers with the real-time data information of the vehicles by the web server; and S4, selecting the vehicles and informing drivers of the selected vehicle from the matching result information. According to the invention, by grasping the real-time data information of the vehicles, matching the orders of the passengers with the real-time data information of the vehicles and selecting and dispatching corresponding vehicles, the empty-loaded rate of vehicles can be reduced, the resource waste can be reduced, the transportation cost can be reduced and the demand for the outgoing of people can be met to a greater degree. Shown by a large amount of data statistics, the transportation cost of the vehicle is reduced by 60 percent by adopting the invention.

The invention discloses a closed type production line device and a method for crushing aluminum oxide crusted blocks. In the invention, materials are crushed primarily on a production line, so that the feeding particle size is less than or equal to 300 millimeters, the discharging particle size is less than or equal to 1 millimeter, a standard discharging particle size which can only be reached by performing secondary and tertiary crushing is reached, the production efficiency is increased, the consumption is lowered, and aluminum oxide crusted blocks are recycled in time; and automatic running of the entire production line is controlled through an electric control system, so that dust purification in the crushing process is realized simultaneously. The closed type production line device consists of a mechanical part and an electric control part, wherein the mechanical part consists of a crusher, an iron remover, a conveyer, a raw material cabin, a gate valve, a vibratory feeder, a pulverizing mill, an air locking discharge valve, a coarse powder separator, a cyclone dust collector, a circular fan, a bag type dust collector, an exhaust fan, iron removers and a finished product cabin. The method for crushing the aluminum oxide crusted blocks comprises feeding, pulverizing, material separating, air replenishing, material and dust collecting and material storing in sequence. The device and the method are safe, environmentally-friendly and efficient, and energy is saved.

The invention discloses an integrated monitoring and managing system for a middle and low voltage distribution network. The integrated monitoring and managing system comprises an intelligent data collection terminal, a data transmission module, a data processing module, a service module and a display module, wherein the intelligent data collection terminal transmits initial data to the data processing module through the data transmission module; the data processing module carries out real-time processing on the obtained data, generates cooked data capable of being recognized by the system andstores the cooked data into a real-time database; the service module provides the cooked data to the outside world and generates a real-time state of the distribution network and a real-time alarm oran event record according to the cooked data; and the display module displays the cooked data in a form of an image or a video and provides a user with human-computer interaction with a managing function. The management level and the service quality of a middle and low voltage distribution network system can be improved, complaints from the user are reduced, informationalized, automated and interactive development of related business of the middle and low voltage distribution network is achieved and a foundation is laid for construction of a smart power grid.

The invention discloses a comprehensive detection method of anchoring status of a prestress anchor cable. By detecting the anchor length, grouting plumpness, prestress and corrosive degree of the prestress anchor cable, the method conducts the contrastive analysis and comprehensive analysis of a single index and consequently analyzes the anchorage quality and safety performance of the prestress anchor cable. The detection method has great significance to control the construction quality of newly built anchoring engineering and grasp the operating status and safety of the existing anchoring engineering.

The invention discloses a bucket production line device and a method for crushing aluminum oxide crusting blocks. A material is subjected to primary crushing on a production line, then the material feeding granularity is less than or equal to 300mm, the material discharging granularity is less than or equal to 4mm, and the standard material discharging granularity which can be reached by traditional two-time crushing and three-time crushing is reached. The automatic operation of the whole production line is controlled through an electric control system, so the production efficiency is improved, the consumption is reduced, the aluminum oxide crusting blocks are timely recycled, the failure and the maintenance are reduced, and the labor intensity of workers is reduced. The bucket production line device consists of a mechanical part and an electric control part, wherein the mechanical part consists of a crusher, a first iron remover, a conveyor, a raw material cabin, a gate valve, a vibration feeding machine, a pulverizer, a bucket, a second iron remover, a vibrating screen, a bag dust collector, an exhaust fan and a finished product cabin. The method for crushing the aluminum oxide crusting blocks sequentially comprises the following steps of: feeding the material, pulverizing the material, separating the material, collecting dust and storing the material. The device is simple in structure; the method is simply and quickly performed; energy is saved; the efficiency is high; and the device is safe and environment-friendly.

The invention discloses a vehicle road guidance and evacuation method based on cloud computing. The method comprises a positioning module, a reminding module, a communication module, a timing module,a positioning module 2, a communication module 2, a processing module, a communication module 3 and a storage module used for storing data, wherein the positioning module, the reminding module and thecommunication module are arranged in a vehicle; the timing module, the positioning module 2 and the communication module 2 are arranged in each intersection traffic light; the processing module and the communication module 2 are arranged in a cloud server; the vehicle and the traffic light are both in communication connection with the cloud server; all operations are centralized in the cloud server, the vehicle does not need to carry out any calculation, and the range of applicable vehicles is expanded. The method can carry out real-time position monitoring and circuit monitoring on the vehicle so as to master a vehicle operation situation in time. Jam positions and road sections can be accurately judged, and a traffic police is informed in time. The traffic light is controlled to controla jam situation in time so as to avoid worsening, and the vehicles can be orderly and accurately guided and evacuated after the situation is completely controlled.

The invention discloses a metering box locking and controlling management system with evidence obtain, alarm and permission manage, comprising a managing system, an acquiring / controlling terminal, a camera, a photoelectric sensor, a passive intelligent lock, an intelligent palm and a metering box intelligent management APP. The managing system is used for performing remote informatization management on the archive and the operation records of the metering box. According to the metering box locking and controlling management system with permission managing, video evidence obtaining and remote alarming, the metering box operation condition detection and on-site video evidence obtain can be realized through linkage of the acquiring / controlling terminal, the camera, the photoelectric sensor and the passive intelligent lock hardware device, and the opening / unlocking permission management, the operation record and the abnormal condition alarm can be realized through linkage of the managing system, the intelligent palm and the above devices. According to the metering box locking and controlling management system with evidence obtain, alarm and permission manage. According to the meteringbox locking and controlling management system with evidence obtain, alarm and permission manage, the work management means for the metering box can be increased, the operation flow of the metering boxcan be specified, the power stealing prevention management is achieved to a certain extent, and the system is worthy of being popularized and used.

The invention discloses a program and a method for monitoring a PC (Personal Computer) state. The method comprises the steps that an operation state signal is sent to a monitoring program at fixed time points by a main program operated on the PC; a monitoring state signal is sent to a PLC (Program Logic Control) program on a PLC controller at fixed time points by the monitoring program operated on the PC; and the PLC program performs display through an indicating lamp according to analysis of the state signals sent by the monitoring program. In the invention, program state and PC state can be monitored uninterruptedly in real time so that the invention has low cost and is simple and convenient to use.

The invention discloses a method, a device and equipment for supporting packet capture and a medium. The method comprises the following steps of extracting the target information in an application program to be subjected to packet capture; obtaining a first proof file and a second proof file pointing to the target information; inserting a target verification logic into a source code of a to-be-captured application program to obtain a target source code, and storing all or part of files in the first proof file and the second proof file into a target position pointed by the target verification logic; releasing a target application program based on the target source code; accessing a server holding the first certification file based on the target application program so that an agent tool cancapture information in a communication link of the target application program and the server holding the first certification file; wherein a second certification file is arranged in the agent tool, and the second certification file is used as a current effective file. According to the method, on the basis of ensuring the communication security, the packet capture requirement of the application program is met.

The invention discloses a hard disk monitoring method. The method comprise: obtaining preset to-be-monitored parameters of each hard disk; monitoring the actual state of the to-be-monitored parametercorresponding to each hard disk by utilizing the first type of protocol; in response to the detected actual state abnormality of the to-be-monitored parameters of the hard disk, acquiring protocol numbers of a plurality of second-class protocols corresponding to the to-be-monitored parameters with the abnormal actual state according to a preset mapping relationship; acquiring information corresponding to other parameters related to the to-be-monitored parameter with the abnormal actual state by utilizing a second type of protocol corresponding to the plurality of protocol numbers; and feedingback the actual state of the to-be-monitored parameter and information corresponding to other parameters. The invention further discloses a system, computer equipment and a readable storage medium. According to the invention, the state of the hard disk is monitored through the first-class protocol, and whether the related parameters need to be further acquired by utilizing the second-class protocol or not is determined according to the monitoring result, so that a user can obtain perfect information of the hard disk when the hard disk is abnormal.

The invention provides a two-dimensional code generation device for reporting measurement data of an environment monitoring instrument. The two-dimensional code generation device comprises a control unit, a connecting unit of an instrument output interface and the control unit, a two-dimensional code display unit, an external control APP, a power supply and power supply control unit, a power supply and network indication unit and a shell unit. The connecting unit of the instrument output interface and the connection unit is connected to the serial port or Bluetooth interface of the monitoringinstrument for data transmission; and the control unit analyzes and standardizes the data, generates a corresponding two-dimensional code and displays the two-dimensional code on the two-dimensionalcode display unit, and an external control APP scans the two-dimensional code to obtain a processing result and reports the processing result to the cloud system. Due to the application of the device,the problem that monitoring instrument data depend on manual filling and reporting in environmental monitoring activities is solved, rapid uploading of monitoring process data and result data is achieved by means of a two-dimensional code circulation mode, the monitoring instrument does not need to be transformed, and the device has good universality and application value.

The invention relates to a desulfurization and denitrification pollution treatment facility cost optimization method, and belongs to the technical field of environmental management. The desulfurization and denitrification pollution treatment facility cost optimization method comprises the following steps: S1, collecting data of a pollution treatment facility, wherein the data comprises material energy consumption data and emission monitoring data; S2, collecting various emission regulations and standard limit values corresponding to industries and regions to which pollution discharge units belong; S3, establishing a relationship between the cost and the emission concentration; S4, establishing constraint equations of the emission concentration limit value, the annual emission limit value,the seasonality and the emission limit value of the special time period according to the collected emission regulation and standard limit value; S5, calculating the annual lowest operation emission cost on the premise of compliant emission to obtain the daily average emission amount and emission concentration of each month; and S6, making an annual emission plan according to the obtained daily average emission amount and emission concentration, thereby reducing the cost of pollution treatment facilities.

The invention discloses an unbalanced distribution network power flow calculation considering distributed power supply access, which includes the steps: step 1, obtaining the a-phase injection current(img file = 'DDA0001844054350000012. TIF' wi= '83' he= '63' / ) in a three-phase system, 2, obtainingthe b-phase injection current (img file= 'DDA000184405435000011. TIF' wi= '83' he= '63' / ) in a three-phase system, 3, obtaining a c-phase injection current (img file = 'DDA000184405435000013. TIF' wi= '83' he= '63' / ) in a three-phase system, 4, obtaining a node current equation according to a node voltage equation of a circuit, and calculating a node injection current; 5, substituting that node current equation into the power equation; Step 6, expanding the equation obtained in step 5, and finally obtaining the power flow calculation composed of the active and reactive power equations of the node injection power equation; the method can help to determine the distribution of voltage and powerflow in three-phase unbalanced power system, and provide the basis for the steady-state analysis of the system.

The invention relates to a control technique for a railway signal lamp and particularly relates to an electric carrier wave lighting control system. The system provided by the invention comprises an outdoor unit, an indoor unit and a detection circuit in the outdoor unit, wherein the detection circuit is electrically connected with the main filament and auxiliary filament of the outdoor unit; the detection circuit is used for detecting the working conditions of the main filament and the auxiliary filament; the detection circuit is electrically connected with electric wire carrier waves through a wave carrier of the outdoor unit; an electric wire is electrically connected with a control circuit of the indoor unit through a wave carrier of the indoor unit; when the main filament works and the auxiliary filament is standby, the main filament works normally and the control circuit of the indoor unit obtains normal filament state information; and when the auxiliary filament works and the main filament works abnormally, while reading that the main filament does not work or generates failures, the control circuit of the indoor unit gives out an alarm and simultaneously communicates with an upper computer through a communication interface circuit of the upper computer. The electric carrier wave lighting control system provided by the invention can be used for conveniently querying the main filament failures of the railway signal lamp.

The embodiment of the invention provides a data information acquisition method, device and system for a fire hydrant extinguishing system and is applicable to fire hydrant extinguishing systems. The fire hydrant extinguishing system comprises a fire hydrant extinguishing system data information acquisition device. According to the embodiment of the invention, the fire hydrant extinguishing system data information acquisition device acquires monitoring information of the fire hydrant extinguishing system, wherein the monitoring information comprises state information of components in the fire hydrant extinguishing system, the monitoring information is summarized to obtain the summarized monitoring data information; and the summarized monitoring data information is transmitted. A monitoring host can master the overall operating conditions of the fire hydrant extinguishing system in real time by virtue of the acquired monitoring information, and failure occurring in the fire hydrant extinguishing system can be timely discovered, so that the fire hydrant extinguishing system is comprehensively monitored by the monitoring host.

The invention discloses a portable intelligent control device and an intelligent control system in the technical field of intelligent control, comprising a casing, wherein a central controller is installed at the intermediate position of an inner cavity of the casing, the bottom of the inner cavity of the casing is sequentially installed with a command signal conversion module, a display module and an input module from left to right, an audio module is mounted on the left side of the inner cavity of the casing, a USB interface is disposed on the top of the casing, the central controller is bilaterally electrically connected with an audio module that is used for processing audio, the bilateral electrical connection of the central controller is used to connect a network connection end of theInternet, and the comparison analysis module is in electrical output connection with an intelligent control module capable of generating an adjusting command. Since the intelligent control module canperform automatic judgment and generate control commands, the portable intelligent control device and the intelligent control system can be controlled autonomously without human supervision, and havereliable analysis results and accurate commands by combining the analysis of the big data platform.

The invention relates to a communication base station fixed energy management system and a management method thereof. The communication base station fixed energy management system is used for managinga fixed energy unit, and comprises a monitoring unit, a diagnosis unit and a balance unit, wherein the monitoring unit is used for performing real-time monitoring on a test battery pack and each single battery, outputting the real-time current of the test battery pack, and the real-time voltage and real-time impedance detection data of each single battery; the diagnosis unit establishes an operational model according to the real-time current of the test battery pack, and the real-time voltage and real-time impedance detection data of each single battery by combination with historical monitoring data, so as to predict the health condition of each single battery and the discharge duration of the test battery pack to provide failure early warning; by virtue of the balance unit, over-chargingand over-discharging of the battery can be prevented, battery attenuation can be suppressed effectively, and mixed use of the new and the old can be ensured; the faulty battery can be found in time in the whole system, so that the battery with poor operating state can be replaced accurately; and by virtue of full-life-period effective management on the test battery pack, the operational stabilityof the communication base station can be improved.

The invention relates to the technical field of information processing, and discloses a website information query method, device and equipment and a storage medium, and the method comprises the steps: obtaining a website information query request input by a user on a client; performing keyword identification on the website information query request to obtain one or more identification results; extracting information matched with the recognition result from a preset website database to obtain target data corresponding to the recognition result; generating a target report based on the target data, and sending the target report to a client of the user; according to the invention, by setting the query authority, the user can conveniently and quickly query the data, the information query efficiency is improved, the management of the network data is also facilitated, and the secrecy performance of the network data is improved; the accuracy of a website information query result is improved, so that a user can obtain a desired query result; the operation condition of the network can be effectively mastered from multiple aspects through the target report, and the monitoring efficiency of the network is improved.

The embodiment of the invention provides a data information acquisition method, device and system of a fire-fighting emergency lighting and evacuation indication system and belongs to the technical field of fire fighting. The data information acquisition method, device and system are applied to the fire-fighting emergency lighting and evacuation indication system. Sensors are mounted on all components of the fire-fighting emergency lighting and evacuation indication system and are used for obtaining monitoring information of the fire-fighting emergency lighting and evacuation indication system; the monitoring information is collected to obtain collected monitoring data information; the collected monitoring data information is sent. The whole operation condition of the fire-fighting emergency lighting and evacuation indication system can be grasped in real time through the collected monitoring data information, and faults of the fire-fighting emergency lighting and evacuation indication system can be found in time, so that the more comprehensive monitoring on the fire-fighting emergency lighting and evacuation indication system is realized.

The invention provides a practical training assessment platform for automobile transmissions, including a support frame, a turntable, a bracket, a transmission, etc., the support frame is provided with the turntable, the turntable is fixed with a bracket, and the transmission is located on the support On one side of the support frame, the component placement frame and the display operation screen are arranged, and the display operation screen is located above the component placement frame. Wireless sensors are placed in the installation parts, and a receiver and a control system are built in the display operation screen, and the wireless sensor is used in conjunction with the receiver, and a switch and a data output interface are arranged on the side of the display operation screen. The beneficial effects of the invention are: the detachable part of the transmission is equipped with a wireless sensor, and when the student moves the detachable part, the relevant information of the part is displayed on the display operation screen, which is convenient for the students to learn.

The invention relates to a closed-wind belt material-type alumina crust block crushing production line device which comprises a first electric butterfly valve, a crusher, a first iron remover, a conveyer, a raw material bin, a first gate valve, a vibratory feeder, a second electric butterfly valve, a pulverizer, a first pressure transmitter, a temperature transmitter, a coarse powder separator, a second pressure transmitter, a cyclone dust collector, a third pressure transmitter, a first electric adjusting air door, a circulating fan, a hand-operated butterfly valve, a fourth pressure transmitter, a bag type dust collector, a second electric adjusting air door, an exhaust fan, a second iron remover, a third iron remover, a finished product bin, a second gate valve and a fifth pressure transmitter. The invention realizes a material feeding particle size of not more than 300mm and a material discharge particle size of not more than 1 mm by one-stage crushing processing of the alumina crust blocks in the production line; the crushing production line device of the invention has less crushing equipment and conveying equipment by 2-3 than current multi-stage crushing devices, but reaches the material discharge particle size that is reached by 2 to 3-stage crushing in the prior art, which improves the production efficiency.

The invention discloses an internet of things-based intelligent control device and intelligent control system and belongs to the technical field of intelligent control. The internet of things-based intelligent control device or intelligent control system comprises a shell; a central controller is installed at the middle position of the inner cavity of the shell; the bottom of the inner cavity of the shell is provided with a command signal conversion module, a display module and an input module distributed sequentially from left to right; an audio module is mounted at the left side of the innercavity of the shell; the top of the shell is provided with a USB interface; the central controller is in bidirectional electrical connection with the audio module for processing audios; the central controller is in bidirectional electrical connection with a network connection end for connecting the Internet; and a comparison analysis module is in electrical output connection with an intelligent control module capable of generating an adjustment command independently. With the internet of things-based intelligent control device and intelligent control system of the invention, the intelligent control module performs self-judgment, and generates control commands, and therefore, independent control can be performed, and manual attendance is not required; and with the analysis of a big data platform used in combination, analysis results are reliable, and the commands can be issued accurately.

The invention relates to safety monitoring of mining equipment. The invention particularly relates to a special monitoring and decision-making system for mining equipment safety. The system comprisesa server, the server is connected with an equipment purchasing information acquisition module for acquiring mining equipment purchasing information, the server is connected with an equipment management information acquisition module for acquiring mining equipment management information, and the server is connected with a keyword retrieval module for performing keyword retrieval on acquired information of the equipment purchasing information acquisition module and the equipment management information acquisition module; according to the technical scheme provided by the invention. The defect that managers cannot quickly and effectively consult related information of mining equipment in the prior art can be effectively overcome.

The invention relates to an open-wind belt material-type alumina crust block crushing production line device which comprises a first electric butterfly valve, a crusher, a first iron remover, a conveyer, a raw material bin, a gate valve, a vibratory feeder, a second electric butterfly valve, a pulverizer, a first pressure transmitter, a coarse powder separator, a second pressure transmitter, a temperature transmitter, a dust collector, an electric adjusting air door, a blower fan, a second iron remover, a third pressure transmitter, a finished product bin, and an electric gate valve. The invention realizes a material feeding particle size of not more than 300mm and a material discharge particle size of not more than 1 mm by one-stage crushing processing of the alumina crust blocks in the production line; the crushing production line device of the invention has less crushing equipment and conveying equipment by 2-3 than current multi-stage crushing devices, but reaches the material discharge particle size that is reached by 2 to 3-stage crushing in the prior art, which improves the production efficiency, and reduces consumption. Meanwhile, the device of the invention is simple in structure, easy to reconstruct, simple in adjustment, convenient for use, energy-saving, high in efficiency, safe, and environment friendly.

The invention discloses an information returning system and a method. The system comprises a display device and a computer system. The display device comprises a control module, a first transmission interface and a display module. The control module comprises a temporary storing unit and a description list. The computer system comprises an information returning module, a second transmission interface, a device enumerating module and an output control unit. The method comprises: conveying the description list to the computer system and enumerating the display device on the computer system; distinguishing the display device enumerated by the computer system; converting the running information of the computer system into an information file; conveying the information file to the distinguished display device; and displaying the content of the information file. The invention can provide a quick and practical inspection manner for a computer system administer, improves the working stabilityof a servo system running for a long time, and synchronously reduces the cost increased by configuring the display device on an enclosure.

The invention relates to a boiler water quality comprehensive monitoring method, system and equipment based on the Internet of Things. The method comprises the following steps: S01, obtaining water quality data and various boiler data; s02, according to the water quality data and the boiler data, the water quality standard reaching condition and the water-saving and consumption-reducing grade of the boiler are obtained through analysis; and S03, generating an analysis report and giving a corresponding optimization suggestion according to the obtained water quality standard reaching condition and the water-saving and consumption-reducing grade. The system is used for implementing the method, and the equipment is used for executing the method. Water-saving and consumption-reducing indexes such as the water quality, the pollution discharge rate and the scaling rate of the boiler can be analyzed and monitored, the water quality standard reaching condition and the water-saving and consumption-reducing grade of the boiler can be obtained through analysis, then various parameters of the boiler are reasonably designed, the operation and maintenance process of the boiler is more scientific and reasonable, and the operation efficiency is improved. And the safety and the energy-saving and consumption-reducing performance in the boiler using process are improved.

The invention relates to a field maintenance strategy optimizing determination method converter transformer. The method comprises the following steps of: obtaining preventive test data of a converter transformer; and carrying out optimizing determination of a field maintenance strategy for the converter transformer, wherein the optimizing determination of field maintenance strategy for the converter transformer comprises the following steps of: determining the expected cost of a converter transformer maintenance scheme at time t, determining the expected risk cost of the converter transformer at time t, determining a predicted value f (X, t) of characteristic quantity at time t, calculating the probability P (Y, t) of various converter transformer fault types at time t according to f (X, t), determining expected fault type risk cost R(t) at time t, and determining a converter transformer maintenance strategy with high economical efficiency. The method provided by the invention can determine a maintenance strategy with the optimal economical efficiency according to converter transformer maintenance cost and fault types; and the determination method provided by the invention is applied to the determination of the maintenance strategy with the optimal economical efficiency for the converter transformer, reduces the total overhaul and maintenance cost of the converter transformer, and prolongs the use period of the converter transformer and has good social and economic benefits.

The invention relates to a control technique for a railway signal lamp and particularly relates to an electric carrier wave lighting control system. The system provided by the invention comprises an outdoor unit, an indoor unit and a detection circuit in the outdoor unit, wherein the detection circuit is electrically connected with the main filament and auxiliary filament of the outdoor unit; the detection circuit is used for detecting the working conditions of the main filament and the auxiliary filament; the detection circuit is electrically connected with electric wire carrier waves through a wave carrier of the outdoor unit; an electric wire is electrically connected with a control circuit of the indoor unit through a wave carrier of the indoor unit; when the main filament works and the auxiliary filament is standby, the main filament works normally and the control circuit of the indoor unit obtains normal filament state information; and when the auxiliary filament works and the main filament works abnormally, while reading that the main filament does not work or generates failures, the control circuit of the indoor unit gives out an alarm and simultaneously communicates with an upper computer through a communication interface circuit of the upper computer. The electric carrier wave lighting control system provided by the invention can be used for conveniently querying the main filament failures of the railway signal lamp.