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An ultra-wide band (UWB) low noise amplifier (LNA) of bandwidth 0.08–3GHz, gain more than 28dB, flatness fluctuating in ± 1dB and noise-figure less than 2.3dB is designed and tested. This LNA utilizes the characteristic of reactance value changing with frequency, especially, adopts capacitance negative-feedback in source electrode to compensate the decrease of high frequency gain. Comparing with traditional...
According to the risk theory, propose the definition of armed forces knowledge management risk. On the basis of that, the risk factors of the armed forces knowledge management were analyzed, and the armed forces risk evaluation index system was constructed. Based on the fuzzy feature of the evaluation index, fuzzy mathematics and neural networks were integrated to established the fuzzy neural network(FNN)...
Analytic hierarchy process (AHP) is a conjoint effective assessing method which combines qualitative and quantitative analysis. Since it is uncertain in the process of deal with qualitative object quatificationally. In order to improve the reliability, the process should be improved in appropriate theories and methods. The weight evaluation method is presented combining AHP and computer technology...
To study the eco-hydrological characteristics of typical vegetation community (Robinia pseudoacacia, Populus euramericana, Fraxinus chinensis) in lowlands of the Yellow River Delta, taking bare area as the control. Soil hydro-physical properties, soil water infiltration and soil water-storage capacity of three kinds of vegetation community were determined in field and laboratory. The results were...
Using FX-4000 strain unit, the proliferation of human lung adenocarcinoma A549 cells and Squamous Carcinoma of Tongue Tca8113 Cells that underwent different mechanical strain were studied. Flow Cytometer was adopted to investigate the proliferation of A549 cells and Tca8113 cells. Experimental results indicated that cell proliferation index (PI) reduced significantly after A549 cells and Tca8113 cells...
How to identify the weak buses comprehensively and practically in power system voltage stability analysis is an important issue, and is posing great interests to the power engineers. In this paper, a multi-criteria integrated voltage stability index was proposed for weak buses identification. Firstly, the bus voltage change index and reactive power margins, which were determined by P-V curve and Q-V...
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