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62results about How to "Uncertain" patented technology

Highway tunnel ventilation feedforward control method based on environmental forecasting

The invention provides a highway tunnel ventilation feedforward control method based on environmental forecasting. The method comprises steps as follows: sensors in a tunnel collect CO/VI concentration and instant information of traffic flow in the tunnel and transmit the CO/VI concentration and the instant information to a monitoring center computer; the traffic flow of the n time period is substituted into a tunnel traffic flow data predication model, and the traffic flow of the (n+1) time period is predicated; theoretical values of the CO/VI concentration in the n time period and the (n+1) time period are obtained through calculation; a predicated increment of the CO/VI concentration is calculated according to an actually measured CO/VI concentration value as well as the theoretical values of the CO/VI concentration in the n time period and the (n+1) time period; the predicated increment of the CO/VI concentration is input into a fuzzy controller, and the number of changed fans is obtained through processing and calculation of the fuzzy controller and is taken as a controlled variable to be output to a site area controller; the site area controller controls the fans to be started or stopped according to the controlled variable. With the adoption of the method, optimal operation of the tunnel ventilation control system is realized, and traffic safety is guaranteed.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP

Search encryption method supporting dynamic updating and multi-keyword safe ranking

ActiveCN104615692ATroubleshoot dynamic update issuesStructural updateFile access structuresSpecial data processing applicationsRankingClient-side
The invention discloses a search encryption method supporting dynamic updating and multi-keyword searching and achieving safe ranking. According to the search encryption method, a red-black tree serves as an index structure, an unencrypted index is generated for a file set, file vectors are stored in leaf nodes, and a union result of child nodes is stored in an internal node. Vectors of all the nodes in the tree are encrypted through an asymmetrical scalar product. During keyword searching, a client side generates a trap door matched with the child nodes of the red-black tree. Calculation is conducted according to the word frequency stored by the leaf nodes, and a top-k file can be returned during searching. When a file is added or canceled, the client side sends a file name and operation, a server returns relevant nodes, and structure updating is achieved in the server. The client side conducts data decrypting and updating and sends decrypted and updated date to the server. Partial updating of the index is achieved through the server. By means of the search encryption method, the dynamic updating purpose of cloud storage data can be achieved, and the user experience can be improved through multi-keyword searching and safe ranking.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Unmanned plane risk-avoiding detection device and method based on supersonic waves and binocular vision

The invention discloses an unmanned plane risk-avoiding detection device and method based on ultrasonic waves and a binocular vision. The device comprises a power supply management system, a c and an interface system. The power supply management system comprises a power supply output management unit, a charging management unit and a lithium battery. The power supply management system comprises a vision unit, an ultrasonic unit, an information processing unit and an inertia unit. The interface unit comprises a display unit, an interface unit and a wireless unit. The method comprises the steps of: controlling the vision unit and the ultrasonic unit to collect visual information and ultrasonic, controlling the information processing unit to collect visual and ultrasonic information and inclination angle data, obtaining the distance of a front obstacle and inclination angle information of the system by means of data fusion, and displaying the generated data through the interface system or uploading the generated data to other equipment. According to the invention, precise distance measurement and obstacle identification are realized for equipment, and the distance measurement precision and the reliability of successful obstacle avoidance are improved to the largest degree.
Owner:ANYANG QUANFENG AVIATION PLANT PROTECTION TECH

Low-delay balanced energy consumption routing method for wireless sensing network

The invention relates to a low-delay balanced energy consumption routing method for a wireless sensing network, which comprises the following steps of: initializing the network and establishing a respective depth weight and a neighbor table for each node, wherein the depth weight is equal to a nodal distance and is proportional to the shortest hop count of a sink node; dividing packets to be transmitted into two types of delay sensitive packets and non delay sensitive packets and carrying out division at frame headers by zone bits; when data is to be transmitted at a certain node, broadcasting a routing request frame added with a certain packet type, waiting to receive a routing response frame of a neighbor node and after receiving the routing response frame, selecting different routing algorithms according to different packet types to select a next hop of node; if the packet type is the delay sensitive packet type, preferably selecting the node with the minimum delay weight to carry out forwarding; and if the packet type is the non delay sensitive packet type, preferably selecting the node with the minimum balance weight to carry out forwarding. According to the invention, the time delay is reduced and the energy consumption is more balanced.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI

Method for determining content of pulverized coal, coke and iron-containing charge in blast furnace dust

The invention discloses a method for determining the content of pulverized coal, coke and iron-containing charge in blast furnace dust, which comprises the following steps: 1) determining the true density of materials; 2) preparing a separating medium; 3) carrying out centrifugal separation on the furnace dust; 4) measuring and calculating the weight percentage content of settled coal and settledcoke; 5) calculating the weight percentage content of coal and coke in the furnace dust; and 6) measuring and calculating the composition of the iron-containing charge in the furnace dust. Compared with the prior art, the method has the following advantages and positive effects: the creativity is novel, the method adopts the physical separation method of centrifugal sedimentation to measure and calculate the content of the coal, the coke and the iron-containing charge in the blast furnace dust by utilizing the properties that the particle size ranges of the components are close, but the true densities of the components are greatly different; and the operation is simple, the test accuracy is high, the determination method is less affected by human factors, and the accuracy of the method ishigher than that of the coal rock microscopic analysis method.
Owner:BAOSHAN IRON & STEEL CO LTD +1

Structure positioning sample preparation method of sheet

ActiveCN105300762AFlexible and accurate positioning for sample preparationSimple methodPreparing sample for investigationCorrosionEngineering
The invention provides a structure positioning sample preparation method of a sheet. The method includes the steps that 1, in the thickness direction of the sheet, a sheet surface sample and a cross section sample are perpendicularly taken in a cutting mode perpendicular to the sheet surface, the sheet surface sample and the cross section sample are fixed together, and the sheet surface of the sheet surface sample and the thickness surface of the cross section sample are kept in the same plane; 2, the sheet surface sample and the cross section sample are subjected to metallurgical polishing or corrosion, changing of structures is observed, and the corresponding sheet thickness position generated when the cross section structure changes is determined; 3, the sheet surface of the sheet surface sample and the thickness surface of the cross section sample, which are located in the same plane, are polished at the same so that the thickness of the sheet surface sample can reach the needed sheet thickness position determined in the step 2. According to the method, structure positioning and thickness positioning are combined, and multilevel positioning analysis is achieved; especially, for nondeterminacy of structure changing of a penetrating layer and a plating layer in the thickness direction, a prepared sample can be flexibly and accurately positioned according to structure changing, and therefore practicability is high.
Owner:武汉钢铁有限公司

One-time pad password system based on visual cryptography

The invention provides a one-time pad password system based on visual cryptography. The technical scheme is that the one-time pad password system comprises a main-control module, an identity characteristic input interface, a visual information display terminal, a password input terminal and a plurality of subscriber masking pictures, wherein each subscriber masking picture corresponds to a subscriber; the identity characteristic input interface receives the identity characteristic data input of subscribers and sends the identity characteristic data input to the main-control module; the password input terminal receives the password input and sends the password input to the main-control module; the visual information display terminal receives visual cryptography subsidiary pictures sent by the main-control module and displays the visual cryptography subsidiary pictures to the subscribers; the subscribers place the possessed subscriber masking pictures on a first aligning frame to acquire the password P at the time; the main-control module comprises a master control program and a database; the main-control module takes a computer system as the platform and further comprises another master control program and another database to achieve subscriber register and authentication identification. The one-time pad password system provided by the invention can achieve safe, convenient andefficient subscriber identity authentication.
Owner:NAT UNIV OF DEFENSE TECH

Method for improving moisture resistance of cabbage type rape

The invention discloses a method for improving the moisture resistance of cabbage type rape. The method comprises the following steps of: (A), constructing a glufosinate-ammonium resistant expression vector containing vitreoscilla hemoglobin (vgb), namely, (1) obtaining a target fragment, (2) recovering a polymerase chain reaction (PCR) product, transforming and sequencing, (3) preparing transferred-deoxyribonucleic acid (T-DNA), (4) preparing Vector, (5) preparing the expression vector, and (6) preparing bacterial liquid of agrobacterium tumefaciens; (B), breeding a recovery line of the moisture-resistant cabbage type rape, namely transforming the vgb into R2 by an agrobacterium tumefaciens mediated method to obtain a T0 recovery line, and performing continuous selfing to obtain a T2 recovery line; (C), breeding a maintainer line of the moisture-resistant cabbage type rape, namely (a) transforming the vgb into 6098B by the agrobacterium mediated method to obtain a T0 maintainer line, and performing continuous selfing to obtain a T2 maintainer line, and (b) hybridizing a T1 recovery line single plant serving as a male parent with the 6098B, performing continuous backcrossing by taking the 6098B as a recurrent parent to obtain BC3, and performing selfing to obtain the T2 maintainer line; and (D), obtaining a sterile line of the moisture-resistant cabbage type rape. The method is easy and convenient to operate and obvious in effect, the cost can be reduced, and the breeding progress can be shortened.
Owner:INST OF OIL CROPS RES CHINESE ACAD OF AGRI SCI

In-situ digitized monitoring method for submarine sediment resuspension nonlinear dynamic process

ActiveCN103900789AReal-time analysisGood for Non-Linear PredictionHydrodynamic testingOcean bottomSeabed sediment
The invention provides an in-situ digitized monitoring method for a seabed sediment resuspension nonlinear dynamic process. The in-situ digitized monitoring method comprises the steps that suspended sediment concentration inversion is conducted through seabed-based ADCPs, a probe of each ADCP serves as a signal source, and therefore space-time distribution of the suspended sediment concentration is obtained; a blind source separation technique is used for separating the suspended sediment concentration; according to the principle of nonlinear dynamics, a track of the suspended sediment concentration in a state space is reconstructed by utilizing a time series, and suspended sediment concentration information is converted into correlation dimensions, complexity, a maximal Lyapunov index and an approximate entropy nonlinear index, wherein the correlation dimensions, the complexity, the maximal Lyapunov index and the approximate entropy nonlinear index reflect the features of the nonlinear dynamics; a nonlinear trend is drawn by means of a nonlinear index of the time series and used for reflecting changes in the features of the nonlinear dynamics in the whole process. The in-situ digitized monitoring method for the seabed sediment resuspension nonlinear dynamic process realizes seabed in-situ real-time monitoring of nonlinear dynamic behaviors of changes of the suspended sediment concentration in the resuspension process, provides technical support for mechanism study in the seabed sediment resuspension process, and has the application value of establishing a suspended sediment concentration change model later and predicting the suspension and raise amount of seabed sediments.
Owner:HUAIHAI INST OF TECH

Automatic numerical control machine tool for bolt production

The invention discloses an automatic numerical control machine tool for bolt production, and relates to the technical field of automatic production. The automatic numerical control machine tool for bolt production comprises a bottom plate, a lifting clamp and a mounting frame are fixed to the top of the bottom plate, and a driving motor is fixed to the top of the inner side of the mounting frame. According to the automatic numerical control machine tool for bolt production, in the forward rotation cutting process of a machining device, an auxiliary channel can suck air outside the machining device and then convey the sucked air to the inner side of the machining device, so that air circulation of the inner side of the machining device is improved, and the temperature of a bolt and a machining cutting tool bit is effectively reduced. When the machining device rotates reversely to enable the machining cutting tool bit to be separated from the bolt, the machining cutting tool bit can push out scrap iron in the threads, and mutual movement between air outside the machining device and air inside the auxiliary channel can enable the interior of the auxiliary channel to be in a certain negative pressure state, so that the scrap iron is separated from the machining device through the auxiliary channel.
Owner:沈问娟

Sewage treatment control method based on self-adaptive predictive control

The invention provides a sewage treatment control method based on self-adaptive predictive control, which comprises the following steps of acquiring real-time data in a sewage treatment process, constructing a model-free self-adaptive predictive controller according to the acquired real-time data, outputting a dissolved oxygen conversion coefficient and a real-time control value of an internal reflux quantity by utilizing the model-free self-adaptive predictive controller, according to the real-time control values of the dissolved oxygen conversion coefficient and the internal reflux quantity, controlling the nitrate nitrogen concentration and the dissolved oxygen concentration in the sewage treatment process to track the set expected values in real time, and achieiving the purpose of sewage purification. According to the method, the I/O data in the sewage treatment process are fully utilized, the design of the controller only depends on the I/O data, no model information is needed, the unmodeled dynamic problem can be avoided, the method is particularly suitable for control over the actual sewage treatment process, and effective control results can be achieved under different sewage treatment operation conditions; the problem that the existing sewage treatment method is not suitable for the actual sewage treatment industry due to no modeling dynamics is solved.
Owner:NORTHEASTERN UNIV

A Searchable Encryption Method Supporting Dynamic Update and Multi-keyword Secure Sorting

ActiveCN104615692BTroubleshoot dynamic update issuesStructural updateFile access structuresSpecial data processing applicationsRankingDynamic update client
The invention discloses a search encryption method supporting dynamic updating and multi-keyword searching and achieving safe ranking. According to the search encryption method, a red-black tree serves as an index structure, an unencrypted index is generated for a file set, file vectors are stored in leaf nodes, and a union result of child nodes is stored in an internal node. Vectors of all the nodes in the tree are encrypted through an asymmetrical scalar product. During keyword searching, a client side generates a trap door matched with the child nodes of the red-black tree. Calculation is conducted according to the word frequency stored by the leaf nodes, and a top-k file can be returned during searching. When a file is added or canceled, the client side sends a file name and operation, a server returns relevant nodes, and structure updating is achieved in the server. The client side conducts data decrypting and updating and sends decrypted and updated date to the server. Partial updating of the index is achieved through the server. By means of the search encryption method, the dynamic updating purpose of cloud storage data can be achieved, and the user experience can be improved through multi-keyword searching and safe ranking.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

The Method of Resisting Narrowband Interference in Ofdm Communication System

The invention discloses a method resisting narrow-band interference in an orthogonal frequency division multiplexing (OFDM) communication system. According to the method, an OFDM physical layer obtains interference situations inside a channel used by a current system by means of interference detection, a media access control (MAC) layer calculates available bitmap masks corresponding to spectrum resources according to the interference situations reported by the physical layer and transmits the masks to the physical layer again, the physical layer uses an interference avoiding method and carries out sub-carrier mapping again according to the bitmap masks, the physical layer achieves bitmap information interaction between a base station and a terminal according to a frame structure used for dynamic interaction of the bitmap masks, and the terminal carries out downlink receiving and uplink transmitting according to new bitmap masks, and carries out normal communication flow. The method can effectively resist the narrow-band interference, lowers a system floating error rate (FER) under interference environment, performance of discrete type sub-carrier distribution way is improved, and normal communication of the system under multiple burst interference situations can be achieved.
Owner:SHANGHAI RES CENT FOR WIRELESS TECH

Near-infrared fluorescent probe compound taking N-pyridine oxide derivative as recognition group as well as preparation and application of near-infrared fluorescent probe compound

The invention discloses a near-infrared fluorescent probe compound taking an N-pyridine oxide derivative as a recognition group as well as preparation and application of the near-infrared fluorescent probe compound. The preparation method specifically comprises the following steps: firstly, oxidizing a pyridine heterocyclic compound into an N-pyridine-2-formaldehyde oxide derivative, and taking the N-pyridine-2-formaldehyde oxide derivative as a recognition group; finally, enabling rhodamine B hydrazide to react with the N-pyridine oxide derivative in an organic solvent, so as to obtain the N-pyridine oxide-rhodamine B near-infrared fluorescent probe. The N-pyridine oxide-rhodamine B type near-infrared fluorescent probe can detect divalent palladium ions with high sensitivity and high selectivity, can realize colorimetric and fluorescent dual-mode detection of the divalent palladium ions in the environment, and can also be used for rapid detection of the divalent palladium ions in cells. Besides, the applied N-pyridine oxide derivative is a new recognition group which is easily available in initial raw material and easy to prepare, and has a wide application prospect in the aspect of detecting other heavy metal ions after being combined with other common dyes.
Owner:GUANGZHOU YUEWANG AGRI CO LTD
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