75results about How to "The method is simple and accurate" patented technology

The invention provides a hidden node detection method and equipment. The method comprises the steps of monitoring a signal of a station (STA) in a medium according to a received monitoring instruction, wherein the signal contains the node identification of the station which transmits the signal; if the node identification represents an isolation node of the node, judging whether the station is located in the overlapped coverage area of the node and the isolation node; and if yes, determining the isolation node to be a hidden node of the node. The node comprises a monitoring module, a judging module and a determining module. A node controller comprises a transceiving module, a judging module and a determining module. The scheme provided by the invention realizes accurate positioning of an access point (AP) belonging to the hidden node without changing the STA station.

The invention relates to a preparation method of a mixed hemi-micelle solid phase extractant based on Fe3O4 magnetic nanoparticles. The preparation process mainly comprises three steps: preparation of Fe3O4 magnetic nanoparticles; preparation of a mixed hemi-micelle solid phase extractant; and the process of solid phase extraction. A synthetic method provided by the invention is simple and easy to control. The prepared magnetic mixed hemi-micelle solid phase extractant has high extraction efficiency and is simple to operate. Pretreatment time of samples can be greatly shortened; a lot of poisonous and harmful solvents are not required; pollution is avoided; and loss of samples can be effectively reduced. The mixed hemi-micelle solid phase extractant is very suitable for rapid sample analysis requirements.

The invention relates to a preparation method of a mixed hemi-micelle solid phase extractant based on magnetic carbon nanotubes. The preparation process mainly comprises three steps: preparation of magnetic carbon nanotubes; preparation of a mixed hemi-micelle solid phase extractant; and the process of solid phase extraction. A synthetic method provided by the invention is simple and easy to control. The prepared magnetic mixed hemi-micelle solid phase extractant has advantages of high extraction efficiency and large extraction sample area, can be used to save organic solvents, can be reutilized, is very suitable for rapid sample analysis requirements and is of great significance for researches on highly sensitive detection of flavonoid drugs.

The invention discloses a pipeline closing or blocking monitoring method and system for a fire water supply system. The method comprises the steps that a standard pressure ratio is determined, a real-time pressure ratio is acquired, and the real-time pressure ratio is compared with the standard pressure ratio to judge whether a pipeline between detection points is blocked or a valve is located in a closed state, or judge whether a pipeline of a fire water tank leading to a fire pipe network is blocked or the pressure of a fire water tank is low. According to the method, the states of the fire pipe network itself and the fire water tank are determined by adopting the method of comparing the real-time pressure ratio between the detection points with the standard pressure ratio; the method is simple and accurate, whether the condition that the fire pipeline network is blocked or the valve is closed and the state that the water pressure of the fire water tank is reduced to a threshold value exist in the fire pipe network can be detected in real time, therefore, it is guaranteed that the whole fire pipe network ( including an automatic sprinkler system and a fire hydrant system) can be quickly used, and the loss caused by a fire disaster is reduced.

The invention discloses a transient high-temperature field heat flux measuring device and method based on memory alloy, and aims to solve the defects that an existing measuring method is greatly influenced by the emissivity of a measured object, the response speed is insufficient and the like. The measuring device is composed of a packaging shell, a thermosensitive element, a memory alloy component, a sliding block, a fixed base, a movable bolt and a screw. The packaging shell, the thermosensitive element, the memory alloy component, the sliding block and the fixed base are coaxially installed. The temperature of the thermosensitive element rises under the action of heat carried by a transient temperature high-temperature field, the heat is transmitted to the memory alloy component, and the memory alloy component shrinks under heating to drive the sliding block to move. After the transient high-temperature field is loaded, the axial shortening amount of the memory alloy component is obtained according to the displacement of the sliding block, and in combination with the loading time, passive quantitative measurement of the heat flux of the transient high-temperature field can be achieved. The device is simple in structure, does not need power supply, is convenient to lay and low in cost, can be repeatedly used, and is high in response sensitivity for transient high-temperaturefields with different intensities.

The invention provides a method for detecting the differential fault attack resisting capability of an AES-OTR algorithm. The method comprises the following steps: firstly, performing operation and outputting in a secure environment not added with any fault; secondly, encrypting the message, and inducing the occurrence of a fault through a series of operations for changing the clock, voltage, humidity and the like in an artificial control encryption process to obtain error output; and lastly, establishing a function relationship among correct output, the error output and a key through analysis, deriving the possible location of a fault in order to reduce the guess space of the key, obtaining a subkey by an exhaustion method, and obtaining an original key by a key expansion algorithm. The method only needs to import one fault to deduce the key, so that the method is easy to implement and simple in principle, and an encryption mechanism can be effectively protected from being damaged. Through adoption of the method, an important theoretical basis is laid for the evaluation of a software and hardware security system using the AES-OTR algorithm.

The invention discloses an electro-magnetic doubly salient motor power converter open-circuit fault diagnosis method, and relates to the technical field of fault diagnosis. According to the method, the position of a current sensor in a power converter topology is changed, a first current sensor is placed on a direct-current bus and used for detecting bus current, and a second current sensor is placed on an upper bridge arm power tube bus and used for detecting upper bridge arm power tube breakover current; in combination with the working state of the motor, the phase current is indirectly obtained through the relationship between the breakover current and the phase current of the upper bridge arm power tube to realize the normal operation of the motor; according to different current flowing paths corresponding to faults of different power tubes, fault diagnosis is realized by combining driving signals and position signals of the power tubes. Compared with a traditional fault diagnosis method without changing the positions of the current sensors, the method has the advantages that the number of the current sensors is reduced, open-circuit fault positioning of the power tube can be quickly realized, and the implementation method is simple and accurate.

The invention discloses an adaptive variable-step integration method for global energy Internet operating characteristic simulation. According to the method, influence factors of energy, politics and economy are extracted, rate variables and state variables are determined according to the causality between all the influence factors, a macroscopic operating characteristic causal graph of global energy Internet is established, historical data of the influence factors of different types is subjected to standardization processing, all the variables are selected in sequence, all variable sets pointing to the variables is searched for, an algebraic equation between the variables is determined according to the historical data, construction of a mathematical formula between system variables of the global energy Internet is completed, the equation is subjected to differencing processing, an improved Euler method is adopted to perform iteration before an emergency happens, a fourth-order Ronge-Kutta method is adopted to perform iteration after the emergency happens, simulation prediction is performed with an adaptive step, and macroscopic operating characteristics of the global energy Internet are predicted and deduced.

The invention relates to a method for detecting resistance of an HAS-160 algorithm to a differential fault attack. The method includes the steps of: randomly generating a plaintext message to be processed; utilizing the HAS-160 algorithm to process the plaintext message to obtain correct output and error output; calculating difference values of the correct output and the error output; and analyzing the difference values, judging whether the HAS-160 algorithm is influenced by a differential fault attack, deriving the position of fault import, and analyzing validity of the position. The method provided by the invention can assess the capability of the HAS-160 algorithm of resisting the differential fault attack.

The invention relates to the field of detection of an inclined pull line of a contact network support device and particularly to a method and a device of identifying a no-stress defect of the inclinedpull line. Aiming at problems existing in the prior art, the invention provides a method and a device of identifying the no-stress defect of the inclined pull line. The method comprises the steps ofobtaining part linear information of a panoramic picture through image processing such as edge detection, uninterested area elimination and linear detection algorithm; then performing reasoning and judgment on a straight line which corresponds to key suspension through transcendental knowledge to obtain a support lost, a flat cantilever, an inclined cantilever, a positioning pipe and a locator part straight line; then judging whether the inclined pull line is stressed; and furthermore, when the inclined pull line is unstressed, performing linear fitting on an area where the inclined pull lineis, extracting parameters which constitute the fitting as unstressed characteristics, determining the bending and according realizing no-stress defect identification.

The invention belongs to the field of detection of the quality of traditional Chinese medicinal materials and in particular relates to a method for detecting the quality of glycyrrhiza uralensis. The method comprises the steps of determining the total quantity of active ingredients of liquiritin and determining the pesticide residues. The method conduces to solving the technical problems that identification methods of traditional physicochemical properties are complex to operate and have limitation and the quality is difficult to regulate and control, has high degree of accuracy, is simple, convenient and fast to operate, is low in cost and has good application prospect and economic benefits.

The invention discloses a stir friction weld joint quality dynamic detection method. First of all, torque is subjected to high-frequency sampling through a mechanical testing device, a sampling deviceand an oscilloscope, through high-frequency sampling of the torque, the torque change is displayed through the oscilloscope, then the torque between two wave crests is defined as a cycle, the changing situation of the torque in each cycle is sampled and analyzed, each cycle is divided into two parts, the time when the wave crests fall to wave troughs is A, the time when the wave troughs rise to the wave crests is B, finally, A/B is calculated and analyzed, a relational expression 0.8<A/B<1.3 is analyzed, and then whether a weld joint produces defects or not is judged. According to the stir friction weld joint quality dynamic detection method, the stir friction weld joint quality is subjected to dynamic detection based on the torque change, the method is simple and easy, the cost is low, large monitoring equipment investment is not required, and destructive experiments are not required.

The invention provides a method for detecting a capability of an RIPEMD-160 algorithm in defending differential fault attacks. First of all, a certain input message is processed by use of RIPEMD-160; in a message processing phase, two kinds of control are implemented on an execution environment, i.e., on one hand, the processing process needs to run accurately under control and an output result is recorded as Y; and on the other hand, on condition that it is ensured that the processing messages are the same, faults are manually introduced in a processing process, a wrong output result is induced to be generated and is recorded as Y*. Through calculating a differential value between Y and Y*, the capability of the RIPEMD-160 in defending the differential fault attacks is evaluated, if it is detected that the faults take place, positions of the faults can be derived, and validity of the fault positions can be further determined. The method provided by the invention has the advantages of simplicity, rapidness, accuracy, easy realization and the like, and provides a good analysis basis for detecting the capability of the RIPEMD-160 in defending the differential fault attacks.

The invention discloses a kit used for evaluating ovarian cancer primary chemotherapeutic sensitivity, and an application thereof. The kit comprises a blocking reagent, an antigen-antibody reaction system, an avidin-oxide enzyme reaction system and a counterstaining drug. The invention is provided based on the relevance between the expression level of ERCC2 in serous ovarian cancer cells/tissues and sensitivity of cells, tissues or a tumor patient as a host to a primary chemotherapeutic drug. Through ERCC2 detection, purposes such as chemotherapeutic sensitivity/drug resistance evaluation, tumor patient discrimination, and primary chemotherapeutic drug tolerability evaluation can be achieved. The method provided by the invention is simple and accurate. The requirement on a sample is not high. Therefore, the kit and the method can be used in large-scale screening or trace researches. When the kit and the method is used in clinical diagnosis and medication guidance, ex vivo cancer tissues of a patient can be acquired for detection after operation, and the detection is characterized in no wound, no pain, and noninvasiveness. The detection can easily be accepted by patients. With the kit and the application, patient lives can be prolonged, chemotherapy pains of the patients can be alleviated, and life qualities of the patients after operations can be improved.

The invention discloses an expressway traffic accident emergency induction shunting discrimination method, which comprises the steps: obtaining the original traffic capacity of a position where a traffic accident happens before the traffic accident, the actual traffic capacity of the position where the traffic accident happens when the traffic accident happens, and the traffic flow, the maximum queuing length and the shortest dissipation time of the congestion caused by the traffic accident of the target upstream road section during the traffic accident, comprehensively analyzing and comparingthe acquired data, and judging whether emergency induced shunting judgment needs to be carried out on vehicles in the target upstream road section. The method provided by the invention is simple, hashigh accuracy of a discrimination result, and is used for quickly and timely carrying out emergency induction shunting discrimination of the road traffic accident.

The invention relates to a detection method for sphere similarity of a machine-made sand. The method comprises the following steps: 1) sampling, concretely randomly getting machine-made sand particles with a same production batch and different grades, and putting the sampled machine-made sand particles on a clean glass plate; 2) acquiring digital images, concretely shooting the sampled machine-made sand particles from different directions by using a digital camera, and acquiring the digital images of the machine-made sand particles at various directions; 3) pretreating the digital images to obtain two-dimension images; 4) acquiring the circularity of a same machine-made sand particle at various directions in the two-dimension image, and acquiring the sphere similarity of the machine-made sand particle according to the circularity at various directions; and 5) acquiring the sphere similarity of all of the sampled machine-made sand particles one by one, gathering the sphere similarity of the multiple sampled machine-made sand particles, and averaging, so as to obtain the sphere similarity of the machine-made sand particles produced in a same batch. Compared with the prior art, the method possesses the advantages of being simple, accurate, advanced and the like.

The invention discloses a salt-based database error log monitoring system. The system comprises a salt management end, database nodes, storage nodes and a zabbix server, wherein the salt management end is used for managing salt clients, distributing instructions and files, obtaining database process information on the database nodes and acquiring monitoring data; the database nodes are servers for deploying database services, and are used for periodically segmenting error logs and sending the error logs to the salt management end; the storage nodes are used for storing the error logs; the salt management end is further used for sending all the database error logs of all the database nodes to the storage nodes through the salt clints after collecting all the database error logs; and the zabbix server is used for receiving the monitoring data, carrying out warning according to a warning strategy and displaying a tendency chart of the monitoring data. The system is simple in monitoring deployment, low in maintenance cost and high in correctness, and supports various types of databases.

The invention provides a device and a method for testing water binding capacity parameters and pore water distribution characteristics of methane-containing hydrate sediments. The device comprises a pressure chamber, a thermostatic bath I, a low-field nuclear magnetic resonance spectrometer, a pressure supply system, a gas supply system, a constant-speed constant-pressure injection pump and a data acquisition system. The method comprises the following steps: applying air pressure to a sample in a pressure chamber by using nitrogen under high-pressure and low-temperature conditions, reflecting the change trend of pore water by using a low-field nuclear magnetic resonance spectrometer, controlling and measuring the suction force of the sample containing methane hydrate by using an axial translation method, and according to the collection of the water yield of the sample by a data collection system, judging suction balance, calculating the water content of the sample under the suction, and obtaining a soil-water characteristic curve of the methane hydrate-containing soil and the pore water distribution state under each stage of suction, so that the water binding capacity parameter research of the methane hydrate-containing sediment is realized, the principle conforms to a hydrate forming mode and mining working conditions, and the device is simple in structure, and equipment can be provided for most scientific research and design units.

The invention discloses a doubly salient electro-magnetic motor converter power tube and winding open-circuit fault diagnosis method, and relates to the field of doubly salient electro-magnetic motors. And the neutral point voltage of the armature winding of the electro-magnetic doubly salient motor is compared with half of the bus voltage, open-circuit fault diagnosis is carried out on the power tube and the armature winding in the current operation state, the implementation method is simple and accurate, the fault diagnosis speed is high, the diagnosis cost is low, and the fault diagnosis accuracy is high. And the stability of the whole driving system is improved.

The invention relates to a preparation method for a mixed hemimicelle solid-phase extraction agent based on dimercaptosuccinic acid modified ferroferric oxide magnetic nanoparticles. The preparation process mainly comprises the four steps of preparation of ferroferric oxide magnetic nanoparticles, preparation of the dimercaptosuccinic acid modified ferroferric oxide magnetic nanoparticles, preparation of the mixed hemimicelle solid-phase extraction agent and a solid-phase extraction process. The synthetic method provided by the invention is simple and convenient, target object separation can be achieved just through little absorbing agents and short equilibrium time in the extraction process, the extraction capacity is high, lots of toxic and harmful solvents do not need to be used, and environmental friendliness is achieved; and meanwhile, influences of complex matrix effects of environmental samples can be effectively reduced, and the method is quite suitable for the rapid analyzing requirement of trace PPCPs compounds in complex matrixes.

The invention discloses a return code judging method of a current type industrial control bus. The return code judging method comprises the steps of collecting detecting signals sent by a detector, transforming the detecting signals to amplified level signals, obtaining a basic level value, collecting a level value transformed by the collected detecting signals, calculating the difference between the transformed level value and the basic level value, and judging whether a return code exists according to the difference. The invention further discloses a driving circuit of the current type industrial control bus. Due to the fact that the basic level value and the level value after the detecting signals are transformed into the amplified level signal are obtained first, then the difference between the level value and the basic level value is calculated, the fact that whether a return code exists or not is judged according to the difference, and when a return code exists in the detecting signals, the difference is located within a fixed value range, and therefore according to the return code judging method, not only is the fact that whether a return code exists or not is easy to judge, but also the method is accurate and simple, and easy to realize.