521 results about "Dual mode" patented technology

The invention relates to the technical field of hybrid inverters, and discloses a hybrid inverter supporting reactive compensation and a control method thereof, and the hybrid inverter comprises a DC input unit, a three-phase full-bridge inversion unit, a grid-connected switching unit, a signal acquisition unit and a digital control unit. The direct current input unit comprises a photovoltaic interface, a battery interface and a direct current bus and is used for converging photovoltaic and energy storage electric energy; the three-phase full-bridge inversion unit is composed of a power device and an LCL filter and converts direct current into alternating current. The grid-connected switching unit comprises a static switch and an isolation transformer and is used for controlling power grid connection; the signal acquisition unit detects voltage and current signals; and the digital control unit judges a grid-connected mode or an off-grid mode according to the signal, calculates a reactive current reference value and generates a PWM (Pulse Width Modulation) control signal so as to realize reactive compensation control in the grid-connected mode and the off-grid mode. According to the invention, reactive power compensation capability is provided in both grid-connected and off-grid operation modes, and stable operation of the inverter in various working conditions is ensured.

The dual inverter system includes a first inverter connected to one end of a stator coil of the motor and a second inverter connected to the other end. The controller can execute a dual mode in which the motor is driven by two inverters and a single mode in which the motor is driven by only one inverter. The controller closes the upper SW elements of all of the first and second inverters, opens all the lower SW elements, and closes the connection switch when the voltage at the DC end of the first inverter exceeds the threshold voltage. Alternatively, the controllers close all the lower SW elements of the first and second inverters to open all the upper SW elements and close the connection switches.

A communication system is disclosed in which a number of procedures may be performed between user equipment, a base station, and / or the core network in the context of network slicing. The procedures support, for example efficient configuration of paging areas, roaming, access restriction, mobility, setting up of dual mode connectivity, connection re-establishment, efficient paging and slice selection.

A compound or molecular complex. The compound or molecular complex comprises: a metal chelator configured for chelation with a radioactive isotope or a non-radioactive isotope; and a trifluoroborate (BF3)-containing moiety configured for 19F / 18F exchange or a precursor thereof; and optionally a cell-targeting domain.

The invention discloses a slope type caterpillar track gravity energy storage multi-machine system, and relates to the technical field of gravity energy storage. Comprising a main system unit, a supporting track laid according to a mountain structure, a chain type mass block dragging device arranged on the supporting track, double-motor assemblies arranged at the two ends of the supporting track, and a control system used for controlling the main system unit to operate in a power mode and a phase modulation mode. By designing a dual-mode operation system of a power mode and a phase modulation mode, dual functions of energy storage and discharge and reactive power regulation are realized, and by arranging an auxiliary motor and a kinetic energy recovery device and combining a staggered arrangement scheme of a heavy-load track and a light-load track, efficient recovery and cyclic utilization of energy in the movement process of the mass block are realized, and the energy utilization rate of the mass block is improved. By establishing a mathematical relationship model of track arrangement and adopting a design scheme of performing dynamic optimization according to mountain characteristics, the operation safety is ensured through an automatic mass block carrying and stacking system.

The invention provides an NFC dual-mode-based service execution method and NFC equipment, the method is applied to the NFC equipment, the NFC equipment is dual-mode equipment of a card reader mode and a card simulation mode, the NFC equipment at least comprises a card reading equipment detection module, and in the card reader mode, in response to the fact that the card reading equipment detection module recognizes that the card reading equipment is close, the NFC equipment detects that the card reading equipment is close. And when the card reading equipment sends a detection signal, stopping broadcasting the signal to the outside, after the card reading equipment sends the detection signal, sending an activation signal to the card reading equipment, switching to a card simulation mode, receiving a standard reading signal sent by the card reading equipment, determining pre-stored label data, and returning the pre-stored label data to the card reading equipment.

The invention relates to the field of battery management, and discloses a battery management system (BMS) control method for battery prediction, which comprises the following steps of: analyzing the difference condition of single batteries; constructing a conventional hybrid balanced switching strategy; constructing a differential hybrid balanced switching strategy; forming different equalization adjustment strategies by the conventional hybrid equalization switching strategy and the difference hybrid equalization switching strategy; determining an executed balance adjustment strategy according to the difference condition of the single batteries; active equalization and passive equalization are carried out separately in a hardware isolation mode and a logic interlocking mode; and constructing a battery state prediction model, and predicting the battery state according to the battery state prediction model. According to the method, the battery equalization adaptability is optimized, the dual goals of improving the equalization effect and reducing the equalization loss are achieved at the same time, the battery state prediction process is doubly optimized through the equalization reference parameters and the conventional operation data, the influence of the equalization process is considered by the battery state prediction model, and the battery state prediction is more accurate.

The invention relates to the technical field of surveying and mapping equipment, and discloses a surveying and mapping instrument with soft and hard ground switching dual-mode supporting legs, the surveying and mapping instrument comprises a debugging platform and a surveying and mapping instrument body, and a multi-stage horizontal adjusting assembly for rapidly adjusting and leveling the surveying and mapping instrument body is arranged between the debugging platform and the surveying and mapping instrument body. The bottom of the debugging platform is provided with at least three sets of supporting leg assemblies, and the bottoms of the supporting leg assemblies are detachably provided with switching discs through separation assemblies. The first soft ground supporting assembly and the second soft ground supporting assembly are adopted to be used according to different soft ground conditions, short-term effective supporting of the tripod is achieved, rapid installation of the switching disc and positioning of the hard ground supporting assembly, the first soft ground supporting assembly and the second soft ground supporting assembly are achieved through the separation assembly, and therefore the switching disc can be conveniently and rapidly installed. And for different use environments, adjustment is carried out when the switching disc is installed, and the operation is simple and convenient.

The invention discloses an under-drive-all-drive dual-mode robot multi-fingered dexterous hand, and belongs to the technical field of robots. The dexterous hand comprises a palm and a plurality of fingers; each finger is provided with a tendon rope transmission system, a second driving assembly, a third driving assembly, a fourth driving assembly and a fifth driving assembly; each finger comprises a base, a base joint, a near-end knuckle, a middle knuckle and a far-end knuckle which are connected in sequence; the base is fixed on a palm; a two-degree-of-freedom finger base joint and a face gear-based mode switching mechanism are designed, so that the dexterous hand can be allowed to work in a full-drive mode or an under-drive mode, and the control complexity of dual-mode coupling is reduced through a mechanical structure. The double modes of the rigid dexterous hand are proposed and realized for the first time, the humanoid dexterous property of the dexterous hand is ensured, the highly integrated design of the dexterous hand is realized, and the universality of the dexterous hand is enhanced.

The invention provides a stress detection system and method based on active and passive dual modes, and relates to the technical field of stress detection, and the system comprises a stress sensor and a data processing module which are in communication connection. The stress sensor comprises a first coil assembly, a second coil assembly and a three-axis magneto-dependent sensor. The first coil assembly is configured to apply a square wave current to the first coil assembly through the excitation source to generate an ACSM effect; the data processing module is configured to collect a voltage signal and a phase signal of the second coil assembly under the ACSM effect; collecting a magnetic field signal of the three-axis magneto-dependent sensor; performing feature extraction on the voltage signal, the phase signal and the magnetic field signal to obtain feature data; and inputting the characteristic data into the joint characteristic decoupling mathematical model, and determining the pipeline stress value of the to-be-detected pipeline, so as to solve the problems that an existing stress sensor is large in error during detection in a low-stress area, and the accuracy of a detection result is low due to interference of an environmental magnetic field.

The invention provides a hydraulic closed-loop tilling depth control system based on multi-sensor fusion in order to solve the problems that traditional tilling depth control is low in precision, poor in stability and the like. The system collects data through an inclination angle sensor, a displacement sensor, a posture sensor and the like, and after fusion processing, a hydraulic cylinder drives a parallel four-bar mechanism to adjust the tilling depth of the subsoiler. The system has three innovations: firstly, a dynamic model is constructed by using multi-source sensor cooperation and sliding mode variable structure control, the anti-interference capability is improved by combining a control strategy, and accurate tilling depth control is dynamically realized according to soil conditions; 2, a parallel four-bar mechanism is mechanically designed to be combined with hydraulic drive, terrain interference is eliminated by utilizing mechanism characteristics, and the control precision and unbalance loading resistance are enhanced; and thirdly, a bidirectional hydraulic lock and a manual-electric dual-mode oil way are adopted for hydraulic pressure, so that reliable tilling depth control and continuous operation are guaranteed. The three innovations are fused, and a high-precision, strong-stability and ultra-reliable tilling depth control solution is provided for saline-alkali soil agriculture.

The invention discloses a bridge underwater safety detection method based on opto-acoustic dual modes, and relates to the technical field of underwater engineering detection, and the method comprises the following steps: obtaining water area particle size distribution and concentration data by using a multi-frequency acoustic suspended sediment concentration profiler, establishing an environmental parameter database, configuring a shipborne detection device according to the initial environmental parameter database, and detecting the underwater safety of a bridge according to the shipborne detection device. The method comprises the following steps: setting a three-axis stabilized platform carrying a polarization imaging camera and a multispectral LED array, deploying a multi-beam detection module and ADCP equipment, and establishing a unified coordinate system; multi-angle original intensity images are collected through a polarized optical imaging module, and multi-exposure fusion is carried out after processing is carried out through a mutual information minimization algorithm. An optical image and an acoustic point cloud are deeply fused by adopting a graph neural network, the detection precision is improved through dynamic weight optimization of an attention mechanism and a space-time registration algorithm, a multi-index fusion model is constructed based on fuzzy logic and a D-S evidence theory for adaptive early warning decision, upgrading from single-parameter alarm to multi-dimensional decision is realized, and the false alarm rate is reduced.

The invention discloses an anti-reverse-connection and power-adjustable showing stand integrated power taking device and a control method, and relates to the related field of showing stands, the anti-reverse-connection and power-adjustable showing stand integrated power taking device comprises a layer plate assembly, a lamp tube assembly, a power taking assembly, a showing stand assembly, a driving rod assembly and a plug assembly, the lower end of the layer plate assembly is rotationally connected with the lamp tube assembly, and the rear end of the layer plate assembly is fixedly connected with the power taking assembly; the rear end of the laminate assembly is in sliding connection with the showing stand assembly, stepless adjustment of the brightness of a lamp tube is achieved through the PWM technology, and diversified showing requirements are met; a driving assembly is innovatively combined with intelligent heat dissipation, so that stable operation of equipment is ensured; a unique pneumatic emergency power-off mechanism provides physical-level safety protection, response is rapid and reliable, the functions of manual and electric dual-mode operation, remote intelligent control, emergency lighting and the like are integrated, the industrial pain points that a traditional showing stand is tedious in installation and inconvenient to adjust, has potential safety hazards and the like are solved, and perfect unification of safety, flexibility and intelligence is achieved.

The invention relates to a dual-mode storage-calculation-encryption integrated circuit and an operation method thereof, in particular to an integrated circuit with both a PUF (Physical Unclonable Function) mode and an eCIM (Enhanced Common Information Model) mode. The dual-mode signal processor, the vector coding circuit, the word line driving circuit, the bit line driving circuit, the external signal decoding circuit, the selector circuit, the comparator circuit, the analog-to-digital converter and the shift adder circuit are arranged on the periphery; according to the PUF mode, the coupling complexity of the PUF in the spatial dimension is improved through complementary word lines, nonlinear XOR operation is achieved in each basic unit through a pairing method of two state complementary transistors, Hamming distance comparison between two columns is introduced, and the machine learning modeling attack resisting safety of the PUF is improved; according to the eCIM mode, an encrypted data weight matrix stored in a transistor is protected through XOR encryption, high-energy-efficiency and high-parallelism in-memory calculation operation is achieved through a nonvolatile transistor array, and high-parallelism in-situ decryption in-memory calculation is completed through complementary word lines.

The invention belongs to the technical field of navigation, and discloses an inertial navigation method and system based on dual modes and a medium, the dual modes comprise a first navigation mode and a second navigation mode, the first navigation mode adopts a first combined navigation mode formed by combining an inertial unit with an ultra-short baseline acoustic positioning unit and a Doppler velocity measurement unit, and the second navigation mode adopts a second combined navigation mode formed by combining an ultra-short baseline acoustic positioning unit and a Doppler velocity measurement unit. The navigation mode II adopts a second combined navigation mode of combining an inertial unit and a geomagnetic measurement unit. The method comprises the following steps: acquiring the depth of the submersible at the current position; and updating the current position of the submersible in real time by adopting the navigation mode I and / or the navigation mode II according to the depth of the submersible at the current position. The method has high positioning accuracy.

The application discloses and realizes a dual-mode multi-load loop arc fault detection system, and aims at the problems of insufficient precision of existing real-time arc fault detection devices and high-load continuous operation of equipment, etc., divides the fault arc into two kinds of starting arc and process arc, and uses different modes of detection methods according to different conditions of starting fault and process fault, adopts a characteristic value partition detection method in the process mode, and makes the method tend to be simple under the condition of ensuring accuracy and real-time performance. The method takes an stm32H7 as a core microprocessor, is matched with a conditioning circuit, a power supply circuit, a data acquisition circuit and a wireless communication circuit to form a dual-mode fault diagnosis system. The application has the characteristics of high monitoring precision and high speed, and has strong popularization value and use value.

The invention provides a conventional and detonation dual-mode spontaneous combustion propellant space engine, and belongs to the technical field of spacecraft propulsion systems. The conventional and detonation dual-mode spontaneous combustion propellant space engine comprises a propellant control valve, an engine head, an engine body and an external excitation device. The propellant control valve, the engine head part and the engine body part are connected in sequence, and the external excitation device is embedded into the outer wall of the engine body part; according to the invention, by adopting an external excitation mode, the space engine in a detonation mode is realized; by means of a selective excitation mode, the space engine capable of selecting a conventional mode and a detonation mode is achieved. The detonation combustion is applied to the spontaneous combustion propellant space engine, the upper limit of the combustion efficiency of the space engine of a constant-pressure thermodynamic cycle is broken through, and the combustion efficiency is further improved on the original basis.

The invention provides an offshore wind power floating type floating body with a self-locking assembly structure, and relates to the technical field of offshore wind turbine foundations, the offshore wind power floating type floating body comprises an assembly module, and the assembly module comprises a floating plate and a mounting platform arranged at the top of the floating plate; the floating part is arranged between the floating plate and the mounting platform; the stabilizing component is arranged in the center of the floating plate; the connecting parts are symmetrically arranged on the peripheral side edges of the bottom surface of the floating plate and comprise a first connecting piece and a second connecting piece which are symmetrically arranged on the two sides of the side edges of the bottom surface of the floating plate and are mutually inserted and matched; through the standardized design of the modularized floating plates and the detachable connecting parts, and by combining the port pre-assembly mode and the water body self-assembly mode, the technical bottlenecks that the land transportation of a traditional floating body exceeds the limit, and the offshore installation efficiency is low are solved; a double-self-locking mechanism driven by water pressure of the floating block and triggered by gravity of the heavy block cooperates with the anchoring block to inhibit horizontal displacement, and the balancing weight excites a dynamic balance system of a pendulum effect, so that the key problem that the anti-overturning stability of the floating body is insufficient in a deep sea area stormy wave environment is solved.

The invention relates to a multi-sensor fusion and dual-mode control unmanned aerial vehicle parachute ejection system and method, and belongs to the technical field of unmanned aerial vehicle safety. Comprising a sensor module used for collecting acceleration, angular velocity and barometric altitude data of the unmanned aerial vehicle in real time; the control module is used for performing fusion processing on the data acquired by the sensor module based on an extended Kalman filtering algorithm so as to determine the state of the unmanned aerial vehicle, and outputting a parachute opening instruction based on parachute opening decision logic; the parachute opening decision logic comprises air crash detection, manual parachute opening instruction response and normal landing detection; and the execution module responds to the parachute opening instruction and controls the ignition head to trigger the ejection parachute to be opened. The problem that the safety application of the unmanned aerial vehicle is restricted due to insufficient reliability, poor complex environment adaptability and lack of full-flight-cycle safety protection in the prior art is solved.

The invention discloses a brake-by-wire method and a brake system in dual modes, and belongs to the field of automobile braking, the brake-by-wire method and the brake system in dual modes comprise a pedal assembly, a vehicle control unit electrically connected with the pedal assembly and a brake-by-wire module electrically connected with the vehicle control unit, and the brake-by-wire module adopts a redundant structure. The brake-by-wire module comprises a main line control brake unit and a redundant brake-by-wire unit, and the main line control brake unit and the redundant brake-by-wire unit are connected with the brake calipers through brake connectors. By the adoption of the brake-by-wire method and the brake system under the double modes, the reliability, the safety and the response accuracy of the brake-by-wire system are remarkably improved through redundant acquisition of the brake intention by the double sensors, backup of the double brake-by-wire units and intelligent switching of the flow channels by the brake connector, stable and efficient operation of the brake function under the complex working condition is ensured, and the brake efficiency is improved. Therefore, the method is suitable for a normal driving mode and an automatic driving mode.

The invention discloses a universal dual-mode active-disturbance-rejection control method for an air-ground amphibious robot. The method comprises the steps that kinematics modeling is conducted on a flight end and a ground end according to the structure of the air-ground amphibious robot; carrying out ground-air double-end common disturbance pre-modeling; constructing an extended state observer; detecting a current motion mode; weighting a nonlinear least square model, compensating disturbance information, and estimating total disturbance in real time; and a bimodal active-disturbance-rejection controller is designed, disturbance is compensated in real time, and bimodal active-disturbance-rejection control over the air-ground amphibious robot is achieved. According to the method, information of all motion mode models and common disturbance of the air-ground amphibious robot are preprocessed, the improved active-disturbance-rejection control method is applied under dual modes, the adaptive capacity of the air-ground amphibious robot to external disturbance and complex environments during reconnaissance work is greatly improved, and the method has universality in control over the air-ground amphibious robots of various mechanical structures.

The invention discloses an air-ground power multiplexing hovercar adopting electric wheel angle modules. The air-ground power multiplexing hovercar integrates electric wheels, a suspension system, a steering system, a car body and a support system. The hovercar has the dual-mode function of a land mode and a flight mode, and switching between the land mode and the flight mode is completed through cooperative work of the electric wheels, the steering system and the support system. Wherein the electric wheels and the steering system both adopt high-integration power multiplexing design, that is, a land mode and a flight mode multiplex the same set of execution motor and planetary gear train, so that the problems that too many actuators are introduced due to switching of the flight mode and the dual modes, the light weight level is low due to miscellaneous equipment, and the power consumption is low are solved to a great extent. And the problem of low-efficiency carrying of invalid loads caused by two sets of independent power is solved. The electric wheel angle module of the hovercar adopts a modular design and is also suitable for four-wheel, six-wheel and other multi-axle vehicle frameworks, and proper electric wheel angle modules can be matched and mounted according to vehicle performance requirements.

According to the face recognition access control terminal offline method and system, a VIP list, permission rules, courses and reservation data are locally stored in an access control terminal, permission verification can still be executed autonomously when the network is disconnected, and it is guaranteed that the access control function is continuously available; the server synchronizes data by adopting a timed task and real-time triggering dual mode, and the changed content is automatically and complementarily transmitted after the network is recovered during the network disconnection period, so that the consistency of the terminal strategy and the server is ensured; differential verification logics of an administrator, a teacher and a student are combined, and VIP permission, a laboratory range, a course period and appointment auditing are fused, so that the risk of misjudgment is reduced; normal passing requirements are still met during network interruption, waiting or congestion caused by network interruption is avoided, the management efficiency is improved, and different laboratory scene requirements are met.

The invention relates to the technical field of communication, in particular to a communication method and device, which are used for solving the problem of how to communicate terminal equipment integrating two or more capabilities with network equipment. The method comprises the steps that a paging message is received, the paging message is used for paging a first type of terminal equipment, and the first type of terminal equipment has at least two working modes of environment Internet of Things terminal equipment; and if at least two working modes of the environment Internet of Things terminal equipment exist, sending a random access request. By indicating the type of the paged terminal device in the paging message (i.e., the paged terminal device has dual mode (or multimode)), the network device can obtain the capability of the terminal device.

The invention discloses an underwater robot multi-source energy system and an energy management method, and relates to the technical field of underwater robot energy, and the system comprises a lithium ion battery which is directly connected in parallel with a DC bus; the super capacitor is connected to the direct current bus through the bidirectional DC / DC converter; the flexible power generation module is used for capturing water flow disturbance and mechanical vibration energy in the environment where the underwater robot is located; the propelling kinetic energy recycling unit has a driving mode and a power generation mode and is used for recycling kinetic energy in the propelling and braking processes of the robot; the battery management system is used for monitoring the voltage, the current, the temperature and the SOC state of each energy unit in real time and executing an energy distribution strategy based on multi-source information fusion; wherein the battery management system communicates with the bidirectional DC / DC converter through a CAN bus, and cooperatively controls an energy flow path. The method has the advantages that the energy utilization efficiency is improved, the dynamic response capability is enhanced, and the cruising ability is prolonged.

The invention relates to the technical field of ship safety, in particular to a ship navigation monitoring management system and method based on edge computing, and the system comprises seven cooperation modules: a data collection module synchronously obtains ship multi-source data, and a processing storage module achieves the data compression, marking and storage. The encryption security module completes full-process AES-256 encryption through a hardware encryption chip, the dual-power supply module guarantees stable power supply, the satellite positioning module obtains accurate positioning through Beidou / GPS dual modes, the self-inspection maintenance module monitors faults in real time, and the AI edge calculation unit achieves channel object recognition, track analysis and violation warning through a deep neural network model. According to the method, closed-loop processes of data acquisition, encryption, processing, intelligent analysis and fault handling are completed through module cooperation; the invention aims to solve the problems of high monitoring delay, insufficient data security, unreliable power supply and the like of the existing system.

Systems, method, and computer readable medium are provided for a controller for a generator. The system includes a rectifier for converting a first AC signal generated by the generator to a first DC signal; a first DC-DC associated with energy storage and a first mode; a second DC-DC associated with an inverter and a second mode; a switch for alternately toggling between the first DC-DC and the second DC-DC, wherein the first mode prevents output to the electrical grid, and the second mode enables inversion of the second DC signal to a second AC signal via the inverter; and a processor that uses the indicator to operate the switch to operate the generator in the first mode when a connection to the grid does not conform with a parameter, and operate the generator in the second mode when the connection to the grid conforms with the parameter.

The invention discloses an intelligent robot system integrating health monitoring and cleaning functions for old people, and belongs to the technical field of intelligent old people nursing auxiliary equipment. According to the system, through cooperative work of the health monitoring module, the cleaning module, the interaction module, the control module and the communication module, health monitoring, intelligent cleaning and convenient interaction of old people in a family scene are achieved. The health monitoring module integrates the functions of blood pressure detection, medicine taking reminding and fall detection, and supports multi-dimensional health data acquisition and cloud transmission; the cleaning module realizes an efficient cleaning task through dual-mode control and intelligent path planning; the interaction module adopts a voice recognition mode and a touch control operation mode and adapts to the use habits of the old. And the control module dynamically coordinates health monitoring and cleaning functions through a multi-modal data fusion algorithm and a priority scheduling strategy, and preferentially processes emergency health requirements. The communication module supports dual-network encryption transmission, and collaborative management of local equipment and a cloud is realized. The system breaks through the bottleneck of function isolation of traditional equipment, improves the life safety and convenience of old people through an intelligent algorithm and an aging-suitable design, and has the advantages of high integration level, high adaptability and remote management capability.

The disclosed technology is generally directed to a wireless device. In one example of the technology, the wireless device includes a network modem and a controller. The network modem may connect with a first network in a first network mode and connect with a second network in a second network mode. The controller may control a connected state and an inactive state of the first network mode and the second network mode. The controller may switch the first network mode from the inactive state to the connected state when the second network mode is in the inactive state and switch the second network mode from the inactive state to the connected state when the first network mode is in the inactive state.

The invention belongs to the technical field of integrated air conditioners, and particularly relates to a multifunctional portable air conditioner which comprises a machine shell integrally designed to be of an omega-shaped structure, the machine shell is divided into an evaporation side and a condensation side through a partition plate, and the evaporation side is provided with a refrigeration assembly, comprises a first air inlet and a first air outlet and is used for outputting cold air; a heating assembly is arranged on the condensation side, comprises an air inlet grille and a second air outlet panel and is used for outputting hot air; mounting slots are formed in the partition plates and can be inserted into partition structures such as window frames and car windows, so that quick deployment is facilitated; a user can select cold air or hot air to face the to-be-adjusted space by rotating the machine shell, and switching between the refrigerating mode and the heating mode is achieved. According to the multifunctional portable air conditioner, refrigerating and heating dual modes are achieved, portability and multi-scene adaptability are unified, the structure is compact, the function integration degree is high, and the multifunctional portable air conditioner is suitable for various scenes such as rooms, vehicles, tents, fishing, camping, production workshop stations, stadiums and temporary offices.