33results about How to "Reduce the chance of detection" patented technology

The invention discloses a capacitive gas sensor based on a carbon nanotube array and the preparation method thereof. Wherein, a capacitive gas sensor structure is composed of two flat electrodes which are respectively arranged at the upper and the lower ends of the carbon nanotube array, the carbon nanotube array, which is produced in an anodic alumina template with the method of chemical vapor deposition, is served as a support structure, which causes the space between two flat electrodes is micron-sized; the variation of the gas dielectric constant, which is flown between the two electrodes of the capacitive sensor, is represented by the variation of the capacity of the capacitive sensor, thereby the type of the tested gas can be decided. The invention avoids the deficiency in the available gas sensors, effectively shortens the space between the two electrodes of the capacitive sensor, and improves the detection sensitivity of the sensors for gas.

The invention discloses an air radio monitoring system based on ground remote control of a multi-rotor robot. The air radio monitoring system comprises the multi-rotor robot, a flight control unit, a directional antenna, an electronic compass, a radio monitoring reception unit, a central processing unit, a ground remote control unit and a ground control unit. The directional antenna, the electronic compass, the radio monitoring reception unit, the flight control unit and the central processing unit are all mounted on the multi-rotor robot. The central processing unit is connected with the radio monitoring reception unit and the electronic compass. The directional antenna is connected with the radio monitoring reception unit. The flight control unit is connected with the ground remote control unit. The ground remote control unit is connected with the central processing unit. The air radio monitoring system provided by the invention is low in manufacturing cost, low in flight cost, simple in structure, convenient to operate and high in safety, can control various flight attitudes of the multi-rotor robot through ground control, and can complete the radio monitoring task in the air.

The invention discloses a cardiopulmonary sound auscultation detector for assisting accurate auscultation. The cardiopulmonary sound auscultation detector comprises a power supply module, a processor,a touch display screen, a memory and a signal transmission module, wherein the power supply module is electrically connected with the processor, the touch display screen and the signal transmission module respectively. An auscultation system comprises an electronic stethoscope, earphones and the detector. An auscultation method comprises the following steps: the touch display screen senses a touch position which is touched by a user and represents a cardiopulmonary sound auscultation position; the processor identifies a classification position of the touch position in a cardiopulmonary soundauscultation position identification program; the signal transmission module receives a cardiopulmonary sound signal transmitted by the electronic stethoscope; the processor converts the cardiopulmonary sound signal into a cardiopulmonary sound signal to be classified; the processor compares the cardiopulmonary sound signal to be classified with a signal classification model in a cardiopulmonary sound signal classification program and determines a type; and the processor transmits the type and the waveform of the cardiopulmonary sound signal to be classified to the touch display screen for displaying.

The invention discloses a capacitive gas sensor based on a carbon nanotube array and the preparation method thereof. Wherein, a capacitive gas sensor structure is composed of two flat electrodes which are respectively arranged at the upper and the lower ends of the carbon nanotube array, the carbon nanotube array, which is produced in an anodic alumina template with the method of chemical vapor deposition, is served as a support structure, which causes the space between two flat electrodes is micron-sized; the variation of the gas dielectric constant, which is flown between the two electrodesof the capacitive sensor, is represented by the variation of the capacity of the capacitive sensor, thereby the type of the tested gas can be decided. The invention avoids the deficiency in the available gas sensors, effectively shortens the space between the two electrodes of the capacitive sensor, and improves the detection sensitivity of the sensors for gas.

The embodiment of the invention provides a text information hiding method and device, electronic equipment and a storage medium. The method comprises the steps of inserting a to-be-hidden text into any one of M+1 positions determined by M second characters in a preset random character set to obtain M+1 text character strings; for each text character string, exchanging the position of each character in the text character string with other characters, and for each character, calculating the difference value between the character distance between the characters before and after the character exchange position and the character distance of the corresponding characters in the to-be-hidden text; for each character of each text character string, according to the difference value between the character distance between the characters before and after the character exchange position and the character distance of the corresponding characters in the to-be-hidden text, conducting calculating to obtain the comprehensive difference value of different text character sets obtained before and after the character exchange position; and taking one or more of the text character sets corresponding to the comprehensive difference values meeting the preset requirements as a target character set.

The invention relates to a three-dimensional antenna, a communication system, an air vehicle and a transport tool. The three-dimensional antenna is used for transmitting or receiving electromagnetic waves and comprises at least one antenna assembly which is non-planar three-dimensional geometry-shaped; and each antenna assembly includes a body and an electric conduction layer which is attached on the inner surface and / or the outer surface of the body. According to the technical scheme of the invention, the three-dimensional antenna comprises at least one antenna assembly which is non-planar three-dimensional geometry-shaped; and the electric conduction outer surface of the antenna assemblies can be respectively adopted as radiation surfaces; and therefore, the out-of-roundness of the radiation horizontal surfaces of the antenna can be effectively improved.

The embodiments of the present invention disclose an optical fiber communication mechanism-based omnidirectional invisible shield. The shield includes a shield body; the shield body is a hollow cylinder; the shield body includes a light incoming and outgoing layer, a light gathering and expansion layer, a light-along-curve transmission layer and a hollow region which are sequentially distributedfrom outside to inside; incident light enters the light incoming and outgoing layer of the shield body; the light is gathered through the circular truncated cone-shaped quartz body of the light gathering and expansion layer; the light is transmitted to the light gathering and expansion layer through the light-along-curve transmission layer; the light is expanded through the circular truncated cone-shaped quartz body of the light gathering and expansion layer; and the light is emitted out from the shield body through the light incoming and outgoing layer; and therefore, an object to be hiddenin the hollow region of the shield body can be hidden.

The invention relates to the technical field of jewelry, and discloses a jewelry encryption display device related to intelligent manufacturing technology, which includes a casing, and a display board is movably connected to the outside of the casing; in case of an emergency, the jewelry can be protected by turning off the power supply. Even if the power is turned on again, the device will not be able to operate without the control of an external switch. Double protection is provided for the movement of the device, which increases the intelligence of the device and effectively improves the safety of jewelry. The jewelry can be automatically changed according to actual needs. The location is convenient for display, and the jewelry can be recycled, so that the jewelry quickly disappears in the visible range, reducing the probability of the jewelry being discovered, and has a high degree of automation. According to the difference in the display situation, the jewelry is automatically blocked. Jewelry is effectively hidden and protected, minimizing the possibility of jewelry being robbed, and increasing the difficulty of jewelry being robbed, effectively reducing losses.

The invention belongs to the field of electromagnetic technology, and discloses a dynamic frequency selective surface structure and a preparation method thereof. The structure consists of a passive frequency selective surface substrate and a conductive performance adjusting component located on the substrate, wherein the conductive performance adjusting component is located at a single passive frequency Inside a surface element structure, or for connecting two adjacent passive frequency selective surface elements. The conductive performance-adjusting component will change between conductor and insulator under the action of changing environmental conditions such as temperature or light intensity, so that the unit structure of the frequency selective surface conductive element will change dynamically. The present invention can effectively solve the problem of performance deterioration caused by the use of integrated circuit components on the active frequency selective surface by improving the unit structure composition of the dynamic frequency selective surface, their setting methods, connection relationships, etc., thereby effectively realizing selective transmission. Dynamic variation of overfrequency.

The invention belongs to the field of sound-and-light engineering technology, and particularly relates to a sound-and-light coupling frequency shift encryption device. Compared with the prior art, thesound-and-light coupling frequency shift encryption technology is advantageous in that 1), compared with prior art in which encryption algorithm researching is focused, the sound-and-light coupling frequency shift encryption technology focuses on secret stealing event in global secret keeping and all links in information transmission; 2) even password information is decoded, protected informationcannot be acquired without the sound-and-light coupling frequency shift encryption device; and 3) even when the device according to the invention is stolen, matched biometric identification modes such as fingerprint identification and iris identification can prevent normal use of the device; and a verification code which matches a first password is generated, identified and verified at the background, thereby greatly reducing probability of being discovered.

The invention provides a metal glass metamaterial with a chiral microstructure. Traditional chiral structural design is applied to a metal glass material. The metal glass metamaterial comprises a cylinder made from the metal glass material and ligaments connected with the cylinder in a tangent mode. The overall mechanical property of the structure can be regulated and controlled by changing the number, the thickness, the length and the arranging mode of the ligaments and the radius of the cylinder. According to the metal glass metamaterial with the chiral microstructure, through perfect combination of the advantages of the chiral structure and the metal glass material, the mechanical properties of a traditional multi-hole material, chiral material and metal glass are greatly improved, the light effect and the negative Poisson ratio can be achieved, the metal glass metamaterial is high in elasticity and strength and large in plasticity, a large-scale metal glass metamaterial is expected to be prepared, and the metal glass metamaterial can be applied to the specific fields such as weight reduction and sound and energy absorption.

The invention relates to a liquid crystal display device and a driving method thereof. The liquid crystal display device includes a liquid crystal display panel, a backlight module, and a control circuit. The liquid crystal display panel includes n display areas, and the backlight module includes n backlight areas corresponding to the n display areas one-to-one. n is a natural number greater than or equal to 2, Each backlight area is used to provide backlight to a corresponding display area, and the control circuit is electrically connected to the liquid crystal display panel and the backlight module, and is used to sequentially scan n display areas and apply corresponding grayscale voltage signals to n display areas and control For the light emission of n backlight areas, when the i-th display area is scanned, the i-th display area is applied with the corresponding grayscale voltage signal, the i-th backlight area corresponding to the i-th display area is turned off, and the i-th display area All the backlight areas other than the two backlight areas are turned on, and i is a natural number greater than or equal to 1 and less than or equal to n.

The invention discloses a recyclable food phase transition heating bag comprising an insulation and thermal membrane 1, a phase transition heater 2, a charging power supply 3, a switch 4, a charging port 5, and a seal port 6. The heating bag herein has the advantages of simple structure, recyclable usage, even heating, warmth-keeping, no need of supplementing exciting agents, no generation of gas, and no generation of environmental contamination. The heating bag herein effectively reduces the temperature outside the food bag and also the chances of being detected by an infrared detector.

The invention belongs to the field of sound-and-light engineering technology, and particularly relates to a sound-and-light coupling frequency shift encryption device. Compared with the prior art, thesound-and-light coupling frequency shift encryption technology is advantageous in that 1), compared with prior art in which encryption algorithm researching is focused, the sound-and-light coupling frequency shift encryption technology focuses on secret stealing event in global secret keeping and all links in information transmission; 2) even password information is decoded, protected informationcannot be acquired without the sound-and-light coupling frequency shift encryption device; and 3) even when the device according to the invention is stolen, matched biometric identification modes such as fingerprint identification and iris identification can prevent normal use of the device; and a verification code which matches a first password is generated, identified and verified at the background, thereby greatly reducing probability of being discovered.

A butterfly-shaped jet-propelled aircraft capable of taking off and landing vertically comprises a butterfly-shaped shell, a supercharged air inlet device, an air supply tube, an oil storage box, an oil supply tube, an engine, an air jet hole, a cab, passenger and freight bin, taking-off supporting wheel, a landing wheel and a taking-off air storage tank. The supercharged air inlet device comprises a conical signal receiver, a cylindrical air inlet, a connecting surface and an air supply half tube, conical tips of conical and double-semi-conical supercharged air inlets are outward, bottoms ofadjacent cones are tangential in pairs, and the engine consists of the gas supply tube, the oil supply tube, a rotary air injection control valve, an air injection guide tube and a turning sprayer; the rotary air injection control valve is positioned in the center and comprises a rotating shaft and a fixing sleeve, the center of the rotating shaft is a combustion air injection rotary guide tube, the bottom of the guide tube is a 90-degree elbow, during rotation, the elbow is successively connected with various combustion chambers, a primary cooling and rotary air injection guide tube and a secondary cooling and rotary air injection guide tube are arranged on the outer side of the combustion air injection rotary guide tube, the 90-degree elbow is arranged on the bottom of the combustion airinjection rotary guide tube and is connected with various air injection accelerators along with rotation, and generated high-speed injected air is sprayed out via the sprayer.

The present invention relates to the technical field of the Internet of Things, and discloses a home safe safety device based on the Internet of Things, including a box body, the bottom of the box body is movably connected with a base, and an anti-theft mechanism is arranged inside the box body. The two sides of the box are respectively connected with a front door and a back door, the inner wall of the base is slidingly connected with a drawer, the surface of the back door is provided with an unlocking mechanism, the inner wall of the box is welded with a partition, and the front of the partition A camera is fixedly installed on the inside of the box, a baffle is welded on the inner wall of the box, and a locking mechanism is provided on the left side of the front door. Through the operation of the locking mechanism, when a thief pries open the front door, the protective plate behind the front door will It will be locked instantly and an alarm will be triggered, so that the thief cannot steal, which in turn can reduce the user's property loss. The user can put valuables in from the back door, and the thief will basically only steal items from the front door, which can further reduce the user's property. loss.

The invention provides a vehicle glass light reflection preventing device which comprises a shade cloth (1). The vehicle glass light reflection preventing device is characterized in that a set of magnets (2) are arranged on the edge of the shade cloth (1), an observation opening (3) is formed in the shade cloth (1), and a joint cloth (1a) is further connected to one end of the observation opening (3); a support (4) is connected to the edge of the observation opening (3) and composed of a pair of support rods (4a) and a supporting frame (4b) connected with the support rods (4a); the joint cloth (1a) can be matched with the supporting frame (4b) in a covering mode. The vehicle glass light reflection preventing device is simple in structure and convenient to use, and the problem that when a vehicle runs or parks, a vehicle window reflects light can be effectively solved; particularly, the whole frame can be folded, so that the vehicle glass light reflection preventing device has the advantages of being convenient to carry and the like.

Embodiments of the present application provide a text information hiding method, device, electronic equipment, and storage medium. The method includes: inserting the text to be hidden into any of the M+1 positions determined by M second characters in a preset random character set to obtain M+1 kinds of text strings; for each text character String, exchange each character in the text string with other characters, and for each character, calculate the difference between the character distance between the character before and after the character exchange position and the character distance of the corresponding character in the text to be hidden ; For each character of each text string, according to the difference between the character distance between the characters before and after the character exchange position and the character distance of the corresponding character in the text to be hidden, calculate the different values ​​obtained before and after the character exchange position The comprehensive difference value of the text character set; one or more text character sets corresponding to the comprehensive difference value meeting the preset requirements are used as the target character set.