针对在2.4～2.5 GHz频段上工作的授权雷达系统和非授权TD-LTE(TD-SCDMA long term evolution)系统的频谱共享问题,提出一种具体、有效的下行功率分配方法。建立了一个混合频谱共享系统模型,授权雷达系统和非授权TD-LTE系统以overlay和un...针对在2.4～2.5 GHz频段上工作的授权雷达系统和非授权TD-LTE(TD-SCDMA long term evolution)系统的频谱共享问题,提出一种具体、有效的下行功率分配方法。建立了一个混合频谱共享系统模型,授权雷达系统和非授权TD-LTE系统以overlay和underlay的混合方式共存,并引入参数子载波空闲(忙碌)概率以简化模型。文中基于最优化理论,针对该问题建立相应的非凸优化模型。本模型的求解以注水算法为基础,借助蒙特卡洛法求解系统的遍历容量。最后,仿真结果证明此混合频谱共享系统模型能够很好地解决当前场景下的下行链路功率分配问题,并且验证了子载波空闲(忙碌)概率比信道增益对功率分配方案的影响更大。展开更多
This paper presents a new method to study the interaction between tangerine peel and beer by absorption spectrum.The author explores the change laws and the differences of the absorbance on some wave band from the abs...This paper presents a new method to study the interaction between tangerine peel and beer by absorption spectrum.The author explores the change laws and the differences of the absorbance on some wave band from the absorption spectrums of tangerine peel and the mixture of tangerine peel and beer. The results show that there is an obvious difference around 323 nm though the absorbance values of the two samples are almost similar in the most bands. The absorbance value of the mixture is obviously greater than that of tangerine peel at 276 nm in the spectrums, and there is a shift of the peak position in the absorption spectrum of the mixture, which shows the differences of the absorbance values and the peak positions of the two samples. Through comparing the characteristics of the two samples' absorption spectrums, a new method for researching new pharmacological action of tangerine peel is presented in this paper. The result indicates that the technology of spectrum analysis will play an important role in the research and development of Chinese herbal pharmacology and new pharmacology.展开更多
Faults and failures of induction machines can indeed lead to excessive costs, hence, there is a strong demand in the industry for adopting diagnosis techniques to assess and evaluate current condition of electrical ma...Faults and failures of induction machines can indeed lead to excessive costs, hence, there is a strong demand in the industry for adopting diagnosis techniques to assess and evaluate current condition of electrical machines. Eccentricity related faults as well as clutch wobbling constitute major portions of the faults related to induction motors. This paper presents the effect of clutch wobbling and mixed eccentricity on induction machine stator currents and the possibility of distinguishing between each ailment via comparing the abnormal harmonics contained in stator current spectrums in each case. In this paper, the current spectrum of a four pole-pairs, 550 kW, induction machine were calculated for the cases of full symmetry, clutch wobbling, and mixed eccentricity. The calculations involve integration of 93 electrical plus four mechanical ordinary differential equations. Electrical equations account for variable inductances affected by slotting and eccentricities. The calculations were followed by Fourier analysis of the stator currents. Zooms of the current spectrums, around the 50 Hz fundamental harmonic as well as of the main slot harmonic zone, of both calculated and measured currents are included. The spectrums presented in this paper rely on calculations that are performed with dedicated software which is owned by AGH University of Science and Technology.展开更多
文摘针对在2.4～2.5 GHz频段上工作的授权雷达系统和非授权TD-LTE(TD-SCDMA long term evolution)系统的频谱共享问题,提出一种具体、有效的下行功率分配方法。建立了一个混合频谱共享系统模型,授权雷达系统和非授权TD-LTE系统以overlay和underlay的混合方式共存,并引入参数子载波空闲(忙碌)概率以简化模型。文中基于最优化理论,针对该问题建立相应的非凸优化模型。本模型的求解以注水算法为基础,借助蒙特卡洛法求解系统的遍历容量。最后,仿真结果证明此混合频谱共享系统模型能够很好地解决当前场景下的下行链路功率分配问题,并且验证了子载波空闲(忙碌)概率比信道增益对功率分配方案的影响更大。
基金National Natural Science Foundation of Chinagrant number:10172043+1 种基金International Science and Technology Cooperation Programgrant number:BZ2008060
文摘This paper presents a new method to study the interaction between tangerine peel and beer by absorption spectrum.The author explores the change laws and the differences of the absorbance on some wave band from the absorption spectrums of tangerine peel and the mixture of tangerine peel and beer. The results show that there is an obvious difference around 323 nm though the absorbance values of the two samples are almost similar in the most bands. The absorbance value of the mixture is obviously greater than that of tangerine peel at 276 nm in the spectrums, and there is a shift of the peak position in the absorption spectrum of the mixture, which shows the differences of the absorbance values and the peak positions of the two samples. Through comparing the characteristics of the two samples' absorption spectrums, a new method for researching new pharmacological action of tangerine peel is presented in this paper. The result indicates that the technology of spectrum analysis will play an important role in the research and development of Chinese herbal pharmacology and new pharmacology.
文摘Faults and failures of induction machines can indeed lead to excessive costs, hence, there is a strong demand in the industry for adopting diagnosis techniques to assess and evaluate current condition of electrical machines. Eccentricity related faults as well as clutch wobbling constitute major portions of the faults related to induction motors. This paper presents the effect of clutch wobbling and mixed eccentricity on induction machine stator currents and the possibility of distinguishing between each ailment via comparing the abnormal harmonics contained in stator current spectrums in each case. In this paper, the current spectrum of a four pole-pairs, 550 kW, induction machine were calculated for the cases of full symmetry, clutch wobbling, and mixed eccentricity. The calculations involve integration of 93 electrical plus four mechanical ordinary differential equations. Electrical equations account for variable inductances affected by slotting and eccentricities. The calculations were followed by Fourier analysis of the stator currents. Zooms of the current spectrums, around the 50 Hz fundamental harmonic as well as of the main slot harmonic zone, of both calculated and measured currents are included. The spectrums presented in this paper rely on calculations that are performed with dedicated software which is owned by AGH University of Science and Technology.
