Random forest algorithm is a nonlinear supervised classification algorithm, which is based on the idea of ensemble learning and consists of multiple decision tree classifiers. The algorithm has strong generalization a...
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Gamma energy spectrum is a way to confirm the type and content of radioactive nuclides in substances. In order to obtain effective data of gamma spectrum, it is necessary to analyze the data of gamma spectrum obtained...
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A digital nuclear pulse and digital nuclear energy spectrum signal generator was designed using FPGA and digital frequency synthesizer (DDS). It also includes slip signal, triangle wave, square wave, sine wave output....
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Global warming is a pressing issue, accompanied by both rising temperatures and local extreme cold events. This paper analyzes the relationship between global warming and extreme weather events through quantitative an...
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At present, the research institute has developed a three-layer low-temperature protection composite material. Low-temperature protective materials are mainly used for short-term low-temperature protection, effectively...
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Ancient glass products are often weathered to varying degrees after excavation. Detection and analysis of their chemical composition will help to study the ancient glass making process. In this paper, we take a group ...
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With the rapid development of modern industry, enterprises have an increasing demand for data monitoring and automated control of multiple production outlets and production lines. This paper first analyses the structu...
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Aiming at the problems such as few probes, limited detection area and lack of nuclear radiation detection module in existing aquaculture monitoring devices, a new type of aquaculture in Situ monitoring device is desig...
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A signal detection and nuclear signal generator is designed with a 7 and a half high-precision measurement module, high-precision reference source, and digital potentiometer, which integrates the measurement of three ...
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In order to overcome the low efficiency and poor resolution of the one-frequency-one-time frequency-domain electromagnetic(FDEM) method, a well-organized multifrequency resonant network is presented to transmit a synt...
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ISBN:
(纸本)9781509064151;9781509064144
In order to overcome the low efficiency and poor resolution of the one-frequency-one-time frequency-domain electromagnetic(FDEM) method, a well-organized multifrequency resonant network is presented to transmit a synthetized current with two or more frequencies. A lowfrequency square pulse is used as the test signal to find the resonant frequencies, based on which the barcode driving signals are generated by the multi-frequency sinusoidal pulse width modulation(SPWM) method. The simulation results prove that the frequency leakage is reduced a lot and most of the energy is concentrated at the resonant frequencies. The resonant network and control technology is useful for obvious improvement of the sounding efficiency and resolution of FDEM method.
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