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300results about How to "Increased sensitivity" patented technology

Multi-chaotic mapping and DNA coding-integrated image encryption method and device

The invention provides a multi-chaotic mapping and DNA coding-integrated image encryption method and a device thereof, an image decryption method and a device thereof. The image encryption method comprises an image scrambling step used for converting a target image into RGB three color component matrixes, and respectively scrambling the three color component matrixes by adopting an Arnold transformation matrix; a matrix replacement step used for respectively carrying out coding treatment on the three color component matrixes which have been scrambled by adopting different DNA coding schemes, carrying out DNA coding treatment on a chaotic sequence generated by chaotic mapping, and overlapping the three color component matrixes after being coded with the DNA to obtain replaced color component matrixes; and a ciphertext reconstruction step used for carrying out DNA unlocking on the replaced color component matrixes, combining the obtained color component matrixes to obtain a middle ciphertext, and diffusing the middle ciphertext after a sum value is calculated and according to the bitwise XOR form. The method is high sensitivity to plaintexts and secret keys. Meanwhile, the method andthe device have a good scrambling effect and a stronger anti-statistical attack resistance.
Owner:CHONGQING UNIV OF EDUCATION

Method for detecting continuous high-impedance-grounded fault of medium-voltage distribution system by current information

ActiveCN103529358AIncreased sensitivityLower action thresholdFault locationPhysicsHigh impedance
The invention relates to a method for detecting continuous high-impedance-grounded fault of a medium-voltage distribution system by current information, and belongs to the field of an emergency protection circuit device. The method comprises the steps that residual current of each path of outlet wire on the same bus is collected in real time; the residual current is subjected to harmonic analysis; the amplitude value and the phase position of triple harmonics and fundamental waves of the residual current are extracted; the phase position difference and the amplitude value proportion of the triple harmonics and the fundamental waves of the residual current of each path of outlet wire are compared; the comparison with the corresponding preset detecting threshold value is carried out, and when the detecting threshold value condition is met, 'condition satisfaction' flag bits are set, the flag bits are subjected to timing and counting, timing and counting results are classified, corresponding fault events are reported, and corresponding processing program is started. The method has the advantages that the action threshold value of set values of the ground protection action can be further reduced, the high-impedance-grounded fault can be more flexibly detected, and fault circuits are cut in time. The method can be widely applied to the fields of relay protection and high-impedance-grounded fault detection of the medium-voltage distribution system with a neutral point in effective grounding.
Owner:STATE GRID CORP OF CHINA +1

Ion chromatograph -double anode electrochemical hydride generation atomic fluorescent on-line combined system

The invention relates to an ion chromatography-binode electrochemical hydride generation atomic fluorescence on-line combined system, which comprises a liquid chromatography pump, an admission valve, an ion chromatographic column, a three-way connecting device, a peristaltic pump, a binode electrochemical hydride generator, a four-way connecting device, a gas-liquid separator and an atomic fluorescence photometer. Element compounds of different forms in a sample are separated on the ion chromatographic column, the separated components are reduced to gaseous hydride on the binode electrochemical hydride generator, the gaseous hydride after undergoing gas liquid separation through the gas-liquid separator is led into the atomic fluorescence photometer by carrier gas for detection, and signals are recorded and processed by a self-developed work station. The ion chromatography-binode electrochemical hydride generation atomic fluorescence on-line combined system successfully realizes effectively converting the element compounds of different forms separated by the ion chromatographic column into hydride on line, and introduces an atomic fluorescence detection system on line, thereby establishing a simple, quick, sensitive, accurate, economical and reliable new technologic platform for element form analysis.
Owner:ZHEJIANG UNIV +1

Interdigital electrode with nano-dot array, and preparation method and application thereof

The invention discloses an interdigital electrode with a nano-dot array, wherein a metal interdigital electrode array is taken as the main body, and a metal nano-dot structure array is implanted into the gap of the metal interdigital electrode array. The preparation method of the interdigital electrode with the nano-dot array provided by the invention comprises the following steps of: firstly, forming a single layer of ordered dense polystyrene nanosphere arrangement on the surface of a glass sheet; secondly, depositing a metal film on the dense arrangement of polystyrene nanospheres, wherein the deposition thickness of the metal film is lower than 1/2 of the height of the nanosphere; and then removing the nanospheres to obtain the metal nano-dot array; depositing the metal film on the metal nano-dot array, forming an electrode pattern outlined by photoresist on the surface of the metal film, and then performing wet-process corrosion until the metal nano-dot array is exposed again, thereby obtaining the interdigital electrode with the nano-dot array. The interdigital electrode provided by the invention can be used as a biosensor, and is high in compatibility, high in efficiency, low in cost, high in sensitivity and the like.
Owner:NAT UNIV OF DEFENSE TECH

Detection method and detection kit of influenza A virus, H1N1 and H3N2 subtype influenza virus

The invention discloses a detection method and a detection kit of influenza A virus, H1N1 and H3N2 subtype influenza virus, which has the advantages of specificity, sensitivity, good repeatability, fastness and low cost. A specific primer and a TaqMan probe are designed through sequence alignment for searching a highly conserved area according to a North American variant strain M gene of Influenza A Viruse(H1N1)virus in 2009, an HA gene sequence and the HA gene sequence of Influenza A Viruse(H3N2) epidemic strain, which are published in GeneBank; key reagents such as the probe, the primer and positive control (to structure the influenza A virus, the H1N1 and the H3N2 subtype influenza virus gene recombination clone plasmid) in the detection method are developed; and the influenza A virus, H1N1 and H3N2 subtype influenza virus real-time fluorescence RT-PCR (Reverse Transcription-Polymerase Chain Reaction) detection method is established through the optimization of various reaction conditions and the tests on the specificity, the sensitivity and the repeatability. The detection method can be used for simultaneously and specifically detecting the influenza A virus, the H1N1 subtype influenza virus and the H3N2 subtype influenza virus in one test.
Owner:中华人民共和国珠海出入境检验检疫局

Biological model of steroids hormone pollutant in foods and feeds established by utilizing Caenorhadits elegans and method thereof

InactiveCN101982075AIncreased sensitivityObservation is intuitiveAnimal husbandryPollutantBiological modeling
The invention relates to a biological model of steroids hormone pollutant in foods and feeds established by utilizing Caenorhadits elegans and a method thereof, belonging to the field of a safety detection technique of foods and feeds. The biological model of the steroids hormone pollutant in the foods and the feeds is established by utilizing the Caenorhadits elegans. The method of the invention is characterized in that the Caenorhadits elegans is utilized to establish a biological model of steroids hormone pure products; the Caenorhadits elegans is utilized to establish the biological model of steroids hormone in the foods; and the Caenorhadits elegans is utilized to establish a biological model of steroids hormone in the feeds. The invention has the beneficial effects of important significance of the research of the steroids hormone to influence on human health, and short period, high efficiency, conciseness and convenience of the experiment course, less requirements on instruments, low cost and great application value. Moreover, the period of the Caenorhadits elegans from the first stage of larvae to the stage of oviposition and the generation time are detected to identify the precocity phenomenon of organisms under the influence of the steroids hormone by exposing the steroids hormone of the Caenorhadits elegans in the first stage of the larvae.
Owner:CHANGCHUN UNIV OF SCI & TECH
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