372results about How to "Clever design" patented technology

The invention belongs to the field of intelligent household, relates to an intelligent household control system, and particularly to an intelligent household control system based on ZigBee and cloud computing. A main structure includes an information acquisition and equipment control module, a ZigBee wireless sensing network, a household intelligent gateway, an RFID device, a cloud server, and a mobile terminal device, the information acquisition and equipment control module includes an environment information acquisition sensor and a household equipment controller, a ZigBee coordinator node, a ZigBee router node, and a ZigBee terminal node form a ZigBee three-level tree-shaped wireless sensing network to form an intelligent household network frame. The ZigBee network performs the intelligent regulation and control on the household equipment, the user data is stored and processed via the cloud server, the users' behavior habit is deeply tapped, so that a household control scheme based on the users' behavior habit is generated, the indoor wireless signal radiation maintains at a low level, the main structure is simple, the design conception is ingenious, the application environment is friendly, and the market prospect is wide.

Devices related to a near-drowning behavior detection method fusing UWB indoor location with a video target detection and tracking technology comprise a smart bracelet module, an intelligent monitoring information processing module, a communication module and a display alarm module, the smart bracelet module is used for performing indoor location, the intelligent monitoring information processingmodule is used for processing video data acquired by an intelligent monitoring camera, location information of a smart bracelet and water depth information; and the communication module is used for realizing information transfer among the smart bracelet module, the intelligent monitoring information processing module and the display alarm module. Specific detection steps of the near-drowning behavior detection method are performed according to the following way: performing system initialization; and building a relationship among an image of the intelligent monitoring camera, location of the smart bracelet module and a swimming pool coordinate system, then setting near-drowning conditions, and performing near-drowning determination by virtue of a near-drowning detection algorithm. The near-drowning behavior detection method is simple in main body structure, smart in design concept, good in using effect, high in detection accuracy, low in maintenance cost, friendly in application environment and broad in market prospect.

The invention belongs to the field of image recognition processing. The invention relates to a self-adaptive intelligent document recognition and input device and a use method thereof. A data acquisition module acquires a paper text of a client into a picture file through scanning or shooting, the preprocessing module carries out block processing on the text in an image by utilizing a morphological processing algorithm, lattices in each line or table are made into unequal cell blocks, and the character recognition module carries out binary processing on each cell block; Then, the correlation analysis module performs correlation analysis according to a pre-configured keyword and a pre-configured rule; According to the technical scheme, the relation between text blocks is analyzed, a data extraction module is guided to extract needed field content, a deviation rectification module can perform verification and automatic correction on the extracted content according to previous identification and deviation rectification historical data, and finally a result is stored and returned to a calling party. The system is ingenious in design concept, safe and convenient to use, high in intelligent degree, high in recognition accuracy, friendly to application environment and wide in market prospect.

The invention belongs to the field for measuring a friction force and wearing of a higher pair contact lubrication film on the condition of different slide-roll ratios, and particularly relates to a measurement device for a friction force and a wearing process of a lubrication film on the condition of different slide-roll ratios. The main structure of the measurement device comprises a supporting platform, a disc driving device, a ball driven loading rotating device, a rotating device, a wearing measuring device, a translation device, a speed measuring device and a sensor fixing device. The rotating device is arranged below the ball driven loading rotating device and is used for supporting and driving the ball driven loading rotating device to rotate so that a steel ball on the ball driven loading rotating device rotates to a glass plate on the wearing measuring device, and then the steel ball is directly used for performing topography measurement on a wearing surface. The measurement device has advantages of ingenious integral design concept, reasonable layout between devices, multiple functions, high flexibility in switching, high convenience in use, effective measurement for the frictional force and the wearing process of an oil film, high practicability, environment-friendly application environment and wide market prosect.

The invention discloses an SIP soft terminal supporting a WEB service and multiple browsers and a working method thereof. The soft terminal is a multimedia terminal of which various interfaces for supporting the WEB service and multiple browsers are configured on the conventional desktop and which uses a webpage browser as an operation carrier. The soft terminal is provided with a JavaScript interface and a soft terminal assembly module, wherein the JavaScript interface is provided with a soft terminal builder and a soft terminal expansion interface; and a soft terminal functional module is packaged as a soft terminal assembly module by using a browser adapter interface. Compared with the conventional soft terminal, the SIP soft terminal has the advantages that: the building of the soft terminal assembly module is triggered by a JavaScript script and finally the soft terminal is embedded in the browser, the trouble of manual installation by the user is saved and a technique for the embedment in the browser is mature and is easy to realize; an operation platform set for developing WEB expansion services, which is a JavaScript-based bidirectional calling interface is provided for a programmer, the working details of a bottom layer soft terminal module is shielded, and the development of rich WEB services satisfying the individual needs of customers by the programmer is made extremely convenient.

The invention belongs to the higher-pair point / line contact elastohydrodynamic oil film thickness and friction measurement field and relates to a high-stress contact variable sliding-rolling ratio oil film thickness and friction and simultaneous measurement simulation device. The main body structure of the device includes a supporting platform, a disc driving device, a ball driving, loading and rotating device, sensor fixing and adjustment devices, an image acquisition device, a translation device and a speed measuring device; the upper side of the supporting platform is provided with the disc driving device near the left edge of the supporting platform; the disc driving device is used for driving a glass disc to rotate through a disc driving motor; the ball driving, loading and rotating device is located behind the disc driving device; the sensor fixing and adjustment devices are fixedly arranged at the front end and rear end of the right edge of the translation device; and the image acquisition device is fixedly arranged near the rear part of the left edge of the translation device and is used for acquiring the movement information of the glass disc and a steel ball. The device of the invention has the advantages of simple main structure, ingenious design, accurate measurement result, simple and convenient operation, scientific principles, convenient and flexible use, high practicability, good application environment and bright market prospect.

The invention relates to an automatic ridged-bar feeding and discharging system applicable to a numerically controlled lathe and application thereof. The automatic ridged-bar feeding and discharging system applicable to the numerically controlled lathe comprises a storage mechanism, a feeding mechanism, a guide-in mechanism, a discharging mechanism and a controller. The storage mechanism is used for storing ridged bar workpieces. The feeding mechanism is located below the storage mechanism and used for receiving workpieces in the storage mechanism. The guide-in mechanism pushes workpieces in the feeding mechanism into the numerically controlled lathe so that feeding of workpieces can be completed. The discharging mechanism pushes out machined workpieces, so that a discharging process is completed. The controller is electrically connected with the storage mechanism, the feeding mechanism, the guide-in mechanism and the discharging mechanism, so that automatic operation of the whole feeding and discharging system is achieved. The automatic feeding and discharging system designed for ridged bar workpieces can be perfectly matched with the numerically controlled lathe, automatic operation of feeding and discharging of ridged bar workpieces is achieved, production efficiency is improved, product cost is reduced, and the system has the advantages of being simple and practical in structure, reliable in performance, high in efficiency and the like.

The invention belongs to the technical field of environment protecting devices and discloses a water-surface garbage collection ship which comprises a ship body and a bin body arranged on the front portion of the ship body. A garbage collection device is hinged on the upper portion of an advancing end of the ship body through a positioning block, a winding drum driven by a power machine is connected at one end, away from the ship body, of the garbage collection device through a rope, and a supporting rod by which the rope passes is arranged on the ship body between the winding drum and the garbage collection device. By the water-surface garbage collection ship, the problem that manual salvage is high in labor intensity, low in efficiency and prone to causing personal damage to salvage personnel can be solved.

A composite containing high-entropy alloy / ceramic continuous-gradient composite coating comprises a matrix and the high-entropy alloy / ceramic continuous-gradient composite coating. The high-entropy alloy / ceramic continuous-gradient composite coating is 5-10 mm thick and contains high-entropy alloy and aluminum oxide, and the volume fraction of the aluminum oxide in the high-entropy alloy / ceramic continuous-gradient composite coating is in continuous gradient change from the bottom layer to the top layer. The invention further provides a preparation method and device of the composite. By the adoption of the composite containing the high-entropy alloy / ceramic continuous-gradient composite coating and the preparation method and device of the high-entropy alloy / ceramic continuous-gradient composite coating, a conventional preparation method of the high-entropy alloy coating is broken through, the composite containing the high-entropy alloy coating is prepared through an aluminum thermal reaction, the step of compounding high-entropy alloy powder first of all during conventional coating preparation is omitted, and the composite containing the high-entropy alloy coating can be prepared through simple steps; and the whole technological process is ingenious in design and concept, the energy consumption in the preparation process is low, the steps are simple, and operation is easy.

The invention relates to a manual capsule coffee machine, which comprises a main body bracket (23), capsule feeding mechanisms (1-7, 11-24), brewing mechanisms (13, 14, 30-32) and ejecting mechanisms (10, 22), wherein the capsule feeding mechanisms are connected to the main body bracket (23), are supported by the main body bracket (23) and are guided to move on the main body bracket (23); the brewing mechanisms are driven by the capsule feeding mechanisms to execute a brewing action; the ejecting mechanisms coordinates with the brewing mechanisms to eject capsules out; and the manual capsule coffee machine is characterized by also comprising capsule supporting and dropping mechanisms (25-28) with capsule supporting positions and capsule dropping positions; and the capsule supporting and dropping mechanisms are promoted to switch from the capsule supporting positions to the capsule dropping positions by the capsule brewing mechanisms during advancing, and are promoted to switch from the capsule dropping positions to the capsule supporting positions by the capsule brewing mechanisms during withdrawing. Compared with the prior art, the manual capsule coffee machine disclosed by the invention has a simple structure and a skilful design concept.

The invention provides a marine satellite antenna, and belongs to the technical field of electronic communication. The marine satellite antenna solves the technical problem that in the prior art, when a satellite antenna finds stars, electric wires in the antenna are wound due to the unlimited rotation of the antenna. The marine satellite antenna comprises a base and an antenna outer shell which is detachably connected with the base. A center shaft is fixed on the base, a base plate capable of rotating around the center shaft penetrating through the center shaft, a center gear located on the lower side of the base plate is fixed on the center shaft, a first drive motor is fixed on the base plate, a first planetary gear is fixed on an output shaft of the first drive motor, the first planetary gear is meshed with the center gear, the antenna is movably connected to the base plate, and the marine satellite antenna further comprises a rotation limiting device. The marine satellite antenna can find the stars and limit the rotation in an all-around mode, and meanwhile a satellite signal can be enhanced.

The invention discloses a multifunctional grab bucket type water-sludge collector which comprises a grab bucket, a power-assisting rod used for spreading the grab bucket, and a pull rod, wherein the grab bucket comprises a first grab bucket part and a second grab bucket part, upper ends of the first grab bucket part and the second grab bucket part are movably connected, the first grab bucket part and the second grab bucket part can be opened or closed around a connecting part, through holes are formed in the upper ends of the first grab bucket part and / or the second grab bucket part, the pull rod penetrates through the through holes, one end of the power-assisting rod is movably connected with the pull rod, and the other end of the power-assisting rod is movably connected with the inner wall of the grab bucket. The multifunctional grab bucket type water-sludge collector has the beneficial effects of multiple functions, simple structure, convenience in use and low manufacture cost, and is easy to popularize in the market.

The invention belongs to the technical field of intelligent transportation, and provides a highway toll collection method and system for ETC multi-sensor information fusion track restoration. The highway toll collection method for ETC multi-sensor information fusion trajectory restoration comprises the steps: acquiring vehicle-mounted positioning breakpoint information, restoring a vehicle drivingpath, and calculating the estimated cost of high-speed driving of a vehicle, wherein the vehicle-mounted positioning breakpoint information is a discontinuously acquired positioning signal, and the positioning signal is acquired every time when the intensity of the communication base station signal reaches the highest and begins to weaken; comparing the estimated fee with the ETC fee deduction amount of the expressway exit; when the difference between the estimated fee and the ETC fee deduction amount of the expressway exit exceeds a preset amount threshold value, continuing to compare the restored vehicle driving path with the ETC portal frame segmented fee deduction driving path, and determining whether to release traffic and judging whether there is a fee evasion problem or not according to the consistency of the paths.

The invention belongs to the technical field of construction of cast-in-situ concrete beam form steel pipe supports, and particularly discloses a loose sand loading pre-compaction construction method for a cast-in-situ concrete beam form steel pipe support. The problem of difficulty in the pre-compaction of a beam form support in a conventional loading method is solved. The method specifically comprises the following steps of forming a sand loading groove in a cast-in-situ concrete beam bottom board, mounting settlement measurement positioning rods on a beam bottom board support, and performing loading, settlement observation and unloading. The loose sand loading pre-compaction construction method for the cast-in-situ concrete beam form steel pipe support is used for performing pre-compaction construction on the cast-in-situ concrete beam form steel pipe support for the first time, the problem of overloading pre-compaction difficulty caused by narrower beam bottoms, higher beam bodies and higher loads is solved, and convenience and safety in the pre-compaction construction of the beam form steel pipe support are ensured.

The invention belongs to the field of video surveillance technology, and relates to a method for detecting a physical conflict behavior based on low-dimensional spatiotemporal feature extraction and topic modeling. The detection steps are to first define a wordbook, quantize the pixel location of an object, describe the size of a foreground target in a scene, and determine the movement of the foreground pixel. After the above steps, the establishment of the complete wordbook and the corpus establishment are completed. The above calculation method is used to determine a physical conflict behavior. This method combines low-dimensional data feature representation and model-based complex scene analysis, utilizes the change in the location information of a human body in the action to learn an overall motion model independent of body parts, and compares the detected result with parameters in the model by analyzing the overall motion model, to further judge the human body movement state. Compared with the prior art, the method of the invention has a clever design concept, a scientific detection principle, a simple detection method, a high detection accuracy, and a great market prospect.

The invention relates to a video super-resolution recovery method based on deep learning and adjacent frames. The method comprises the following steps: (1) data preprocessing: (2) data enhancement: (3) data conversion: (4) network architecture construction: a network comprises a frame alignment module, a frame fusion module and a reconstruction module; (5) inputting each current video image frameneeding to be subjected to super-resolution recovery and n frames (2n + 1 frames in total) of images before and after the current video image frame into the network architecture constructed in the step (4); and outputting the recovered super-resolution video. According to the invention, the obtained image has a better effect.

The invention discloses a preparation method of the static capacity pressure transducer. It makes the basement module by the conductor and integrates the air faucet, the basement and the movable electrode post head; then it makes the constant electrode on the copper foil of the etched circuit card. The method can improve the production precision and the reliability of the transducer; also it can decrease the cost. The invention also discloses an electric sphygmomanometer made by the static capacity pressure transducer.

The invention belongs to the field of rock fracture prediction, and relates to a rock compression fracture prediction method. Equipment required in the method includes a universal tester, a universal test control system, a CCD industrial camera and a computer. The method includes firstly debugging the CCD industrial camera and the universal tester, then putting a sand rock test piece at the center position of the universal tester, allowing the surface sprayed with speckles of the sand rock test piece to face the CCD industrial camera, shooting an image in the bmp format as an original reference image before deformation, storing the image in the computer as an initial comparison image for later use, then collecting images in a process in which the sand rock test piece is compressed by the universal tester, adopting the collected images as sequential target images after deformation, and subjecting the initial image and the target images after deformation to comparison analysis by utilizing a digital image correlation process to obtain displacement and strain information of the images after deformation relative to the image before deformation. The method is ingenious in design conception, simple to operate, accurate in measurement result, friendly in application environment and wide in market prospect.

The invention discloses a snow sweeper for a road. The snow sweeper comprises at least two brooms which are hoisted between a sweeper head and a carriage, at the lower part of a sweeper frame through a lifting frame, and two groups of accumulated snow conveying devices which are symmetrically arranged on two sides of the sweeper frame through two sweeper frame rollers and two carriage rollers, wherein each of the two sweeper frame rollers is arranged between each of the sweeper heads and the carriage; the two carriage rollers are arranged on the carriage; a floating accumulated snow shovel is arranged at the lower end of each of the accumulated snow conveying devices; a snow outlet end of each of the accumulated snow conveying devices extends to the upper part of the carriage; an accumulated snow sliding groove is obliquely formed in the carriage, at the lower part of the snow outlet end of each of the accumulated snow conveying devices; a plurality of groups of fuel gas spray pipes are arranged under the accumulated snow sliding groove; the fuel gas spray pipes communicate with a fuel gas storing box arranged on the front side of the carriage through hoses; a water inlet with the function of filtering is formed in the top of a carriage, at the lower snow outlet of the accumulated snow sliding groove; and a cleaning opening is formed in the bottom surface of the carriage, and a water outlet pipe is arranged at the lower part of the rear end of the carriage.

The invention relates to the technical field of robots, and aims to provide an amphibious robot with good mobility, low manufacturing cost, small size and wide application range. The amphibious robotcomprises a vehicle body and at least four wheel-leg composite mechanisms arranged on the two sides of the vehicle body, wherein the wheel-leg composite mechanisms comprise composite wheels with hollow inner parts and supporting legs, the axial direction of the supporting legs is perpendicular to the axial direction of the composite wheels, the upper parts of the supporting legs are rotatably connected with and communicate with the axial center of the composite wheels, the composite wheels are driven by wheel drive assemblies, the supporting legs are driven by leg drive parts, impellers are arranged in the composite wheels, water inlets are formed in the outer sides of the composite wheels, and water outlets are formed in the bottoms of the supporting legs. Through the amphibious robot, the problems that an existing amphibious robot is complex in structure, high in manufacturing cost and large in size, is not suitable for working in narrow space and is small in application range are solved.

The invention relates to a wind power generating and energy-saving device for a vehicle, which comprises a wind pipe and a wind power generator. The inner wall of the wind pipe is provided with a rifle screw; the wind pipe comprises a first pipe section and a second pipe section; the longitudinal section of the first pipe section is sector and comprises three side-by-side close wind tunnels which are communicated with the second pipe section; the wind power generator is fixed in the second pipe section; the device also comprises a speed limit protector; and the wind power generator comprises a rotating shaft and a fan blade which is fixed on the rotating shaft, and the speed limit protector is arranged on the rotating shaft. The wind power generating and energy-saving device for the vehicle has unique structural design, can utilize wind energy to charge a storage battery during running of the vehicle, ensure long-term continuous running of the vehicle, save energy remarkably, and is economical, safe and environment-friendly.

The invention relates to a motion planning system for a biped robot. The motion planning system comprises a robot controller and an action actuator, wherein a control signal output end of the robot controller is connected with a signal input end of the action actuator; a signal output end of the action actuator is connected with a signal input end of each joint motor for driving each joint to move; and a signal output end of a falling detection module for detecting the motion station of each joint is connected with a signal input end of the robot controller; the falling detection module is used for acquiring posture information of the robot in real time by using an acceleration sensor; an action storage module is used for storing an action scheme obtained by an action generation module; and the action actuator is used for executing storage action. According to the motion planning system disclosed by the invention, an action module is triggered by closed-loop feedback according to a standing mode of human beings after falling; the motion plan is carried out on corresponding joints of the robot; the stable standing after falling is realized; and upper limbs of the robots are effectively utilized in the action plan, and thus the adaptability of the robot to a complex environment is enhanced.

The invention relates to a pilot test production line and a production process of emulsion explosives. The pilot test production line comprises a water phase system, an oil phase system, a sealed emulsification system and an open emulsification system, wherein the water phase system comprises a water phase tank, a water phase filter and a water phase screw pump which are connected in sequence; the oil phase system comprises an oil phase tank, an oil phase filter and an oil phase screw pump which are connected in sequence; the sealed emulsification system comprises a sealed emulsifier motor, a sealed emulsifier and a first static mixer which are connected in sequence; the open emulsification system comprises an open emulsator motor, an open emulsifier and a second static mixer which are connected in sequence. Two mainstream production modes at present are simulated through a production line at the same time, the pilot test blank is filled, the test effect is good, and the production line has very good market prospects and popularization and application values.

The invention relates to a method for removing hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water is characterized in that electrostatic adsorption effect of a graphene oxide derivative material to the hexavalent molybdenum is utilized for removing the hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water has the advantages that the graphene oxide derivative material is positively charged by regulating the pH value of a mixed solution of the graphene oxide derivative material and the hexavalent molybdenum, electrostatic adsorption is carried out between the graphene oxide derivative material and a negatively charged hexavalent molybdenum material, so as to remove the hexavalent molybdenum, and graphene oxide derivative has large specific surface area, good hydrophilcity, rich surface active sites and high adsorption capacity, so that the method for removing the hexavalent molybdenum in water has good effect and high efficiency.

The invention relates to a traffic signal control system, particularly to a deceleration warning system at a gateway of a trunk road. The deceleration warning system comprises an induction unit, an integrated coordination control module and a deceleration warning unit. The induction unit consist of a cell inlet-outlet access device, infrared detector, or / and a vehicle turning detection unit. The deceleration warning unit includes a vehicle deceleration yellow-flashing warning lamp (1) arranged at a place, approaching a driving direction of one side of a cell, of a trunk road and a vehicle deceleration yellow-flashing warning lamp (2) arranged at a place, far away from the driving direction of one side of the cell, of the trunk road. The integrated coordination control module receives detection signals from the cell inlet-outlet access device (4) or / and the infrared detector and the vehicle turning detection unit, determines right turning or left turning of a vehicle being driven out of the cell, and outputs a control signal to the deceleration warning unit, so that the vehicle deceleration yellow-flashing warning lamp (1) or the vehicle deceleration yellow-flashing warning lamps (1) and (2) works / work and thus a vehicle on the trunk rod to slow down. Therefore, a vehicle driven out of the cell can pass through an intersection rapidly and safely.

The invention provides an ejection type combustion device. The ejection type combustion device comprises a plurality of Venturi combustors and multiple layers of protective covers which are arranged around the Venturi combustors in the axial direction of the ejection type combustion device; each layer of the protective cover is circumferentially closed to form a flame cavity with an upper-end opening and a lower-end opening, the radial size of the previous-layer protective cover is larger than that of the next-layer protective cover in the every two axially-adjacent layers of protective covers, at least one layer of the protective cover is provided with ejection holes which penetrate through the wall faces of the bottom ends of the protective covers, and then the purpose of increasing the air ejection capacity is achieved. According to the ejection type combustion device, the design concept is ingenious, the structure is simple and easy to achieve, the cost is low, and the problems that an ejection type combustion device is insufficient in ejection capacity and combustion, poor in emission and the like can be effectively solved.

The invention discloses a rotary screen printing machine with a liftable roller device. The rotary screen printing machine comprises a long strip groove formed below a rotary screen and a printing belt, wherein the outer sides of the two ends, in the lengthwise direction, of the long strip groove are fixedly connected with a fixing frame; the fixing frame is fixed to side plates on the two sides; supporting plates are also fixed to the side plates on the two sides and fixed with drive motors respectively; an output shaft of each drive motor is inserted into and sleeves in a jack formed in the corresponding supporting plate and is fixed with a vertical regulation rod through a coupler; the lower end of each vertical regulation rod and the corresponding coupler are arranged in the corresponding jack; each vertical regulation rod is inserted into and sleeves in a regulation sleeve; each regulation sleeve is inserted into and sleeves in a through hole formed in a top plate of a bench; and the top end of each vertical regulation rod extends out of the corresponding regulation sleeve and is in threaded connection to a connecting block. The rotary screen printing machine can regulate a roller of a printing machine up and down, and thus the roller presses against cloth to carry out printing, and the printing effect is good.

The invention discloses a preparation method of a composite material containing a high-entropy alloy coating. The preparation method comprises the following steps that (1) oxides or the elementary substance of a high-entropy alloy pivotal element and aluminum powder are blended to obtain a thermite; (2) the thermite obtained in the step (1) is placed into a thermit reactor, the thermite is ignited, thermit reaction is activated to obtain alloy melt, and after stirring, rolling, flowing, layering and standing are performed, bottom layer high-entropy alloy melt and upper layer aluminum oxide slag are obtained; and (3) the bottom layer high-entropy alloy melt obtained in the step (2) is atomized into high-entropy alloy molten drops through a spraying and coating device, and the drops are sprayed and coated on the surface of a to-be-coated substrate, so that the composite material containing the high-entropy alloy coating is obtained. The invention further provides a device used for the preparation method. The whole technological process is ingenious in design and concept, and the preparation process is low in energy consumption, simple in step and easy to operate.

The invention discloses a solar energy wireless digital cable monitoring anti-theft alarm system. The system is characterized by comprising a solar photovoltaic cell, a passive thermal infrared sensing system, an image pick-up system, a PC programming processing system, a transmitting and receiving system, a wireless network, and a monitoring room. The solar energy wireless digital cable monitoring anti-theft alarm system has the advantages of smart technical design conception, extreme high performance of anti-theft and monitoring, high corrosion resistance and weather resistance, high ultraviolet resistance, light weight, low cost, convenient installment and long service life, along with capacity of preventing natural disaster, man-made damage and burglary of electric transmission lines and communication cables.