63results about How to "Enough sensitivity" patented technology

The invention discloses an advanced persistent threat (APT) attack detection method based on deep belief network-support vector data description. A deep belief network (DBN) is used for feature dimension-reduction and excellent feature vector extraction; and support vector data description (SVDD) is used for the data classification and detection. At a DBN training state, the feature dimension-reduction is performed by using the DBN model after obtaining a standard data set; a low-level restricted Boltzmann machine (RBM) receives simple representation transmitted from the low-level RBM by usingthe high-level RBM so as to learn more abstract and complex representation after performing the initial dimension-reduction, and back propagation of a back propagation (BP) neural network is used forrepeatedly adjusting a weight value until the data with excellent feature is extracted. The data processed by the DBN is divided into a training set and a testing set, and the data set is provided for the SVDD to perform training and identification detection, thereby obtaining the detection result. The attack detection method disclosed by the invention is suitable for the unsupervised attack datadetection with large data size and high-dimension feature, is fit for the APT attack detection and can obtain an excellent detection result.

The present invention discloses a flexible printed manure-urine sensor, which comprises three parts such as a flexible film substrate 11, a printing electric conduction electrode 12 and a sensing area 13, wherein the flexible film substrate 11 adopted as a printing substrate is used for supporting the attachment of the electrode part of a sensor and a functional material, the printing electric conduction electrode 12 adopted as the electrode of the sensor is used for achieving a sensing function and transmitting an electrical signal, and the sensing area 13 is used for attaching the functional material, contacting the component in the manure-urine excreta, changing the electrical parameter, and converting into the electrical quantities capable of being sensed by the electrode. According to the present invention, the manure-urine sensor is printed on the flexible film substrate through the printing process, and the sensor has characteristics of simple structure, simple process, low cost, adequate sensitivity, and convenient and comfortable use, and can achieve the single-use and throwing after the use.

The invention relates to a light-sensitive resin composite and a method for manufacturing a printed circuit board using the same. The resin composition comprises the following components: (A) an adhesive polymer, (B) a light polymeric compound with an ethylene unsaturated bond and (C1) a stilbazole compound represented by the following general formula (1); in the formula (1), R1, R2 and R3 respectively represent alkyl with the carbon number of 1-20, alkoxyl with the carbon number of 1-6, alkyl ester with the carbon number of 1-6, amido, and alkyl amido, carboxyl, cyanogen group, nitryl or (methyl) acryloyl group with the carbon number of 1-20 independently, m and n respectively represent the integer of 1-3 independently, and a, b and c respectively represent the integer of 0-5 independently.

The invention relates to an online monitoring system for gas content in transformer oil by using photoacoustic spectrum; the online monitoring system comprises an oil line system, a gas path control module, a photoacoustic spectrum monitoring module and a signal conditioning and analyzing module. The online monitoring system is based on the photoacoustic spectrometry, can replace an offline chromatographic instrument and operate stably for long time on site, can be used for detecting various gases and simultaneously greatly reduces the complexity of detecting the oil line in a transformer on line and the instability of the system.

The invention relates to a method for measuring the residual quantity of chloramphenicol in propolis by using a high performance liquid chromatography tandem mass spectrum. At present, a measuring method with low detection cost and detection limit reaching 0.1mu g/kg is not found. The method comprises work procedures of standard solution preparation, standard curve preparation, propolis sample solution preparation and chloramphenicol residual quantity detection, wherein the work procedure of propolis sample solution preparation comprises the following steps of: adding 1mol/L NaOH solution to dissolve a propolis sample; diluting with water to dilute a target object in the propolis sample; acidizing with HCLO4 so as to precipitate propolis components in the propolis sample; adjusting the pH value of filtrate of the propolis sample solution to be 10.5 with the 1mol/L NaOH solution; and finally measuring the residual quantity of chloramphenicol in the propolis sample solution through a high performance liquid chromatography and a trebling quadrupole rod tandem mass spectrum. The invention has low detection cost and high detection efficiency, the detection limit energy reaches 0.1mu g/kg, the quantitation limit is 0.3mu g/kg and the linear correlation coefficient is 0.9999.

The invention relates to the bacterial endotoxin detecting technique, in particular to a minim endpoint colored limulus test method. The method uses enzyme label plate with 96 micro holes as the reaction vessel and photometry vessel, and uses trace LAL (Tachypleus Amebocyte Lysate, TAL or Limulus Amebocyte Lysate, LAL) as the endpoint colored method for the limulus test. The amount of TAL consumed in the method of trace amount endpoint colored limulus test method only equals to 10 to 20 percent of that consumed in the current limulus test method, namely 10 to 20u 1/T, and the test operation is more simple and swift. Part content in the test method can also be applied to other photometry limulus test, and consumption of ATL can be reduced by 80 to 90 percent.

A photosensitive composition comprising: (A) a sensitizing dye selected from the group consisting of compounds represented by formulae (1) and (2) defined herein; (B) an initiator compound capable of generating a radical, an acid or a base; and (C) a compound capable of changing irreversibly its physical or chemical property with at least one of a radical, an acid and a base.

The invention discloses a self-adaptive distance protection method for a double-circuit line of an intelligent substation, belonging to the technical field of the power system automation. The method comprises the following steps of: 1) acquiring electrical quantity information; 2) performing the self-adaptation of a distance protection fixed value under special operating conditions; and 3) performing the self-adaptation of an impedance relay based on fault type recognition. The self-adaptive distance protection method is capable of effectively overcoming the influence of the zero-sequence mutual induction of the double-circuit line on distance protection, and simultaneously solving the problem of the sensitivity of the distance protection in case of a cross-line fault. Furthermore, the method is applied to field practice without increasing the fixed value or increasing secondary circuit connections and communication loads, and thereby has high practicable value.

The invention discloses a pilot protection method suitable for a T-type wiring transmission line, which is characterized in that: (1) a fast start element: the absolute value of the difference of ik, i<k-N> is more than the sum of the product of Ks and the absolute value of the difference of i<k-N>, i<k-2N> and Imk, wherein N is the number of sampling points of each period, and Imk is a fixed threshold, when any phase in the three-end current of the T-type wiring transmission line meets the conditions, the fast start element acts; and (2) protection action judgment conditions: the absolute value of delta Ucd is less than the product of Krel, Zc and the absolute value of delta Icd; and the absolute value of Icd is more than Iset, wherein delta Ucd is equal to the sum of delta Um, delta Un and delta Up; delta Icd is equal to the sum of delta Im, delta In and delta Ip, Icd is equal to the sum of Im, In and Ip; the delta Um, delta Un and delta Up and delta Im, delta In and delta Ip are the failure voltage component and the failure current component at the m, n, p buses of the T-type wiring transmission line; Im, In and Ip are the steady-state current passing through the m, n and p buses, Krel is a reliability coefficient, ZC is the equivalent capacitance of the line, Iset is a current set value, and Icd is the steady-state differential current of the three-end transmission line. Through the method, the pilot protection sensitivity of the T-type wiring transmission line is not affected by the fault current and through current, and the sensitivity is improved.

The invention relates to a two-way beam multi-axis force sensor, wherein, the elastic element of the sensor is of a symmetrical beam structure; an upper bearing and connecting surface and a lower bearing and connecting surface are toroidal bodies and have the same structure; the lower side of the upper bearing and connecting surface is equipped with a Y-directional stress surface with a rectangular section, and the rectangular section is in transition connection with the upper bearing and connecting surface through an circular arc; the upper side of the lower bearing and connecting surface is equipped with an X-directional stress surface with a rectangular section, the X-directional stress surface is vertically arranged with the Y-directional stress surface in a crossing manner, and the rectangular section is in transition connection with the lower bearing and connecting surface through an circular arc; and a torque MZ stress surface with a round section is arranged between the X-directional stress surface and the Y-directional stress surface and is in transition connection with the directional stress surfaces though circular arcs. The two-way beam multi-axial force sensor improves other axial anti-loading section coefficients under the action of the main shaft load, thus improving the anti-loading capability of the sensor and the anti-interference capability while measuring; and an integrated multi-section structure eliminates the measurement errors caused by factors such as processing, assembly, interchange and the like of combined parts.

The invention discloses a PI (Proportional-Integral) partition control method for an inverter system, which comprises the steps of performing partition division on the working state of the inverter system, judging the current working state of the inverter system when the inverter system is in operation, and selecting a corresponding PI parameter group to perform control on the inverter system according to the current working state of the inverter system. PI control at the DC side and the AC side of the system is carried out in a partition mode according to a predetermined judgment mechanism; asoft start interval, a large load interval, a large load reduction interval and a stable working interval respectively correspond to different PI parameter groups; and each parameter groups include adifferent proportional coefficient Kp, integral coefficient Ki and PWM duty ratio saturation amplitude limit Lim, thereby enabling the system to always maintain the optimal state when being suddenlyswitched in different working conditions such as no load, light load, heavy load and full load, not only have fast response, but also have safe steady-state output.

The invention provides a reference block group used for ultrasonic detection of austenitic stainless steel welding seams, which comprises a plurality of reference blocks (10), wherein welding seams (12) are formed on the side faces of each reference block (10), at least one through-hole (11) is contained in each reference block (10), the center line of each through-hole (11) is parallel to the upper surface of the corresponding reference block (10), and the distances from the center lines of all the through-holes (11) to the upper surfaces of the reference blocks (10) where the through-holes (11) are located are an arithmetic progression. The reference block group used for ultrasonic detection of the austenitic stainless steel welding seams can be used to test the detection capability of an austenitic welding seam ultrasonic detection system and can also be used to adjust the sensitivity before detection, and is smart and convenient to carry.

A polymerisable resin compound, which comprises (A) resin, (B) polymerisable compound, (C) initiating agent, (C-1) initiating adjuvant, (T) polyfunctional mercaptan compound and (D) solvent, the initiating adjuvant (C-1) contains compound of formula (V), in which the point line showed by the X means aromatic loop, Y means oxygen atom or sulfur atom, R<1> means alkyl containing one to six carbon atoms, R<2> means the alkyl containing one to twelve carbon atoms replaced by halogen atom or the aryl containing six to twelve carbon atoms replaced by halogen atom.

The invention provides a fingerprint identification device which comprises a cover plate, a plurality of first fingerprint induction electrodes, a plurality of second fingerprint induction electrodes and one or more capacitance compensation structures, wherein the cover plate is provided with a visible region; the plurality of first fingerprint induction electrodes and the plurality of second fingerprint induction electrodes are arrayed in the visible region in a staggered manner; the plurality of first fingerprint induction electrodes are insulated from the plurality of second fingerprint induction electrodes; each first capacitance compensation structure is arranged above one of the plurality of first fingerprint induction electrodes; the light transmittance rate of the first capacitance compensation structure is greater than that of the corresponding first fingerprint induction electrode. According to the fingerprint identification device, the fingerprint induction electrodes are arranged in the visible region, and the fingerprint induction electrodes in the visible region are endowed with sufficient invisibility and sensitivity.

The invention relates to the technical field of insulator core rod detection, and discloses a composite insulator core rod crisp and decay defect detection device and a detection method thereof.The detection device comprises a knocking rod, an acoustic sensor is arranged at the end of one side of the knocking rod, the detection device further comprises a computer, and the acoustic sensor is in electrical communication connection with the computer; the method further comprises the following steps that a knocking point is selected on the detected composite insulator core rod, a knocking rod is used for knocking, the detected composite insulator core rod generates vibration after being knocked, the vibration drives surrounding air, the surrounding air is spread in the air in the form of sound waves, the acoustic sensor generates an electric signal under the influence of the sound waves, and the electric signal is transmitted to the detected composite insulator core rod. The electric signal is sent to a computer, the computer processes and calculates the electric signal sent by the acoustic sensor, and meanwhile, the computer generates a diagnosis model and carries out crisp and decay defect diagnosis on the detected composite insulator core rod according to data calculated by the computer; the method has the characteristics of accurate detection result and simplicity in operation.

The invention relates to optical fiber sensors, and a system for monitoring granary temperature and stock. The system for monitoring the granary temperature and stock comprises a driver, a laser, a coupler, a detection circuit, a controller, a monitoring center and distributed strain sensitization optical fiber sensors distributed at all measurement points of a granary. Compared with other temperature sensors, the system for monitoring the granary temperature and stock by a nonlinear fusion technology has the advantages that: optical fibers are used as sensing and transfer media of granary temperature and stock information and are arranged in the whole granary; temperature along the optical fibers and strain distribution conditions can be measured; and with the growth of the optical fibers, and increasing of the number of measurement points, the temperature and the stock can be monitored simultaneously, and the cost of sampling points per unit is greatly reduced.

The invention provides an input-current-based method for diagnosing an open-circuit fault of a diode of a subway rectifier set. The method comprises: inputted three-phase alternating currents of fourrectifier bridge grid sides of a rectifier set are collected in real time to obtain three-phase alternating current signals inputted by the four rectifier bridge grid sides; a maximum value of absolute values of all alternating current signals at a current sampling time during the alternating-current power-frequency period is calculated; all sampling current signals during the power-frequency period in which the current sampling time is located are normalized, accumulated summation is carried out, calculation is carried out to obtain a normalized sum value of 12 inputted alternating current signals; and if the normalized sum value of alternating current signals during the continuous five periods exceed a positive threshold Sup or a negative threshold Sdown, occurrence of an open-circuit fault at a diode of a lower bridge arm or upper bridge arm of a corresponding phase of the corresponding rectifier bridge is determined. Therefore, the open-circuit fault of the diode can be detected and the positioning of the fault diode is realized; maintenance is carried out timely and conveniently; and losses increasing and accident occurrence are avoided.

The invention relates to a self-adaption braking method for regional networked differential protection (DP). The method comprises the following steps: creating an association link table of each network node according to connection relationships of other network nodes in DP associated with each network node in a regional network; collecting status quantity information and analog quantity information transmitted by each breaker, and calculating a variable quantity of the current of each network node; selecting the network node with the maximum variable quantity of the current as a fault point if an abnormal variation of the current of the network node is detected; acquiring the number of the network nodes associated with the fault point in the association link tables of the network nodes, and adaptively performing main back-up protection on the fault point to select a braking equation according to the numerical value; and if the equation is met, performing protection actions and tripping associated breakers off. In the method, different braking equations and braking coefficients are selected for protected objects adaptively according to the number of the network nodes in the DP, thereby ensuring enough sensitivity in different situations. In addition, no person is needed to participate in setting.

The invention provides a method for detecting nitrosamine compounds in higenamine hydrochloride, which comprises the following steps: selecting octadecylsilane chemically bonded silica as a filler, and formic acid aqueous solution and methanol as mobile phases, so that when the higenamine hydrochloride containing NDMA, NDEA and other impurities is separated through liquid chromatography, the higenamine hydrochloride and other impurities cannot cause interference on the dissociation selectivity of the chromatographic column on target objects NDMA and NDEA in the dissociation process of NDMA and NDEA molecules under the conditions. The number of theoretical plates of an NDMA peak in the method is not smaller than 6014, the number of theoretical plates of an NDEA peak in the method is not smaller than 120325, symmetry factors are not larger than 2.0, and the recovery rate of the detection method ranges from 85% to 102%. According to the method, the system applicability, specificity, precision, quantitation limit, detection limit, linearity and range all meet the requirements, the separation effect is good, operation detection is achieved, and the method sensitivity is high.

The invention relates to a detection method of chlorphenamine maleate components, and particularly discloses a quick screening method of chlorphenamine maleate doped in Chinese patent drugs and health-care food. The method comprises the following steps of: (1) extracting chlorphenamine maleate in Chinese patent drugs or health-care food with water; (2) adding a chromotropic acid water solution color reagent into the extracting solution; (3) adding an acidic buffer salt solution; and (4) adding dichloromethane into the solution for extracting, absorbing the dichloromethane layer, and observing the color. The inspection method disclosed by the invention is quick, simple and convenient, has the advantages of strong specificity, high accuracy, rapid response and wide range of application, is suitable for inspecting whether chlorphenamine maleate is doped in Chinese patent drugs and health-care food on the site, and can initially judge the content of chlorphenamine maleate.

The invention discloses a quick detection method of glucocorticoid in cosmetics and application. The quick detection method comprises the steps of sample extraction, detection reagent preparation anddetection. According to the method, whether a sample contains the glucocorticoid can be detected quickly and semiquantitatively when a strong-base methanol solution of nitro blue tetrazolium chloridemonohydrate specifically reacts with a functional group of the glucocorticoid to generate a color; high cost and large equipment are not required; and the method is quick in detection, cheap, convenient, quick and safe.