A new Integrated Pest Management program based on the combination of synthetic pesticide with a GRAS （generally recognized as safe）-classified sanitizer for the control of Botrytis cinerea in field conditions was de...A new Integrated Pest Management program based on the combination of synthetic pesticide with a GRAS （generally recognized as safe）-classified sanitizer for the control of Botrytis cinerea in field conditions was described. The aim behind this research was to determine whether the use of this mixture would enhance the efficiency of pesticides while decreasing the recommended dose. Naturally infected tomato plants, grown in the greenhouse, were treated with two commonly used fungicides SWITCH （Syngenta, Switzerland） and SIGNUM （BASF, Germany） each alone or combined with a commercially available organic sanitizer PERACLEAN？5 （Evonik Industries, Germany）. A total of 27 treatments were tested consisting of three concentrations of synthetic fungicide （×1, ×1/2 and ×1/4 of the recommended dose） either applied separately or combined with three concentrations of the tested sanitizer （0.5, 1 and 1.5％）. The control efficacy achieved by the fungicides applied alone ranged between 0 and 66.7％ while all fungicide-sanitizer mixtures resulted in up to 70％ control of grey mould. The treatment that provides the maximum control of B. cinerea was the result mixture of ×1/4 of the recommended concentration of SWITCH （15 g L-1） with 0.5％ of PERACLEAN？5. This combination suppressed 85％ of grey mold infections while decreasing the usually used amount of this pesticide by 75％, reducing therefore the well known negative impacts of chemical pesticides on environment and consumers health.展开更多
Earthquake is a violent and irregular ground motion that can severely damage structures. In this paper we subject a single-degree-of-freedom system, consisting of spring and damper, to an earthquake excitation, and me...Earthquake is a violent and irregular ground motion that can severely damage structures. In this paper we subject a single-degree-of-freedom system, consisting of spring and damper, to an earthquake excitation, and meanwhile investigate the response behavior from a novel theory about the dynamical system, by viewing the time-varying signum function of It can reflect the characteristic property of each earthquake through and the second component of f, where is a time-sampling record of the acceleration of a ground motion. The barcode is formed by plotting with respect to time. We analyze the complex jumping behavior in a barcode and an essential property of a high percentage occupation of the first set of dis-connectivity in the barcode from four strong earthquake records: 1940 El Centro earthquake, 1989 Loma earthquake, and two records of 1999 Chi-Chi earthquake. Through the comparisons of four earthquakes, we can observe that strong earthquake leads to large percentage of the first set of dis-connectivity.展开更多
考虑模型不确定性和外部干扰等影响,基于径向基函数神经网络(radial basis function neural network,RBFNN)和改进的误差符号函数鲁棒积分(robust integral of signum error,RISE)技术,建立无人直升机(unmanned aerial helicopter,UAH)...考虑模型不确定性和外部干扰等影响,基于径向基函数神经网络(radial basis function neural network,RBFNN)和改进的误差符号函数鲁棒积分(robust integral of signum error,RISE)技术,建立无人直升机(unmanned aerial helicopter,UAH)轨迹跟踪控制设计方案。首先,建立包含模型不确定性和外部干扰的UAH非线性系统模型,利用跟踪误差作为RBFNN输入信号估计由模型不确定性和外部干扰组成的复合扰动。其次,将滤波信号及其变化率权重组合作为RISE输入信号设计控制器,从而降低控制设计方案对UAH动力学模型的依赖程度。进而,借助Lyapunov稳定性理论分析整合后闭环跟踪误差系统的稳定性,并给出控制参数的选取方法。最后,借助现有文献中UAH系统模型,仿真与比较结果均说明所提控制算法的有效性和优越性。展开更多
文摘A new Integrated Pest Management program based on the combination of synthetic pesticide with a GRAS （generally recognized as safe）-classified sanitizer for the control of Botrytis cinerea in field conditions was described. The aim behind this research was to determine whether the use of this mixture would enhance the efficiency of pesticides while decreasing the recommended dose. Naturally infected tomato plants, grown in the greenhouse, were treated with two commonly used fungicides SWITCH （Syngenta, Switzerland） and SIGNUM （BASF, Germany） each alone or combined with a commercially available organic sanitizer PERACLEAN？5 （Evonik Industries, Germany）. A total of 27 treatments were tested consisting of three concentrations of synthetic fungicide （×1, ×1/2 and ×1/4 of the recommended dose） either applied separately or combined with three concentrations of the tested sanitizer （0.5, 1 and 1.5％）. The control efficacy achieved by the fungicides applied alone ranged between 0 and 66.7％ while all fungicide-sanitizer mixtures resulted in up to 70％ control of grey mould. The treatment that provides the maximum control of B. cinerea was the result mixture of ×1/4 of the recommended concentration of SWITCH （15 g L-1） with 0.5％ of PERACLEAN？5. This combination suppressed 85％ of grey mold infections while decreasing the usually used amount of this pesticide by 75％, reducing therefore the well known negative impacts of chemical pesticides on environment and consumers health.
文摘Earthquake is a violent and irregular ground motion that can severely damage structures. In this paper we subject a single-degree-of-freedom system, consisting of spring and damper, to an earthquake excitation, and meanwhile investigate the response behavior from a novel theory about the dynamical system, by viewing the time-varying signum function of It can reflect the characteristic property of each earthquake through and the second component of f, where is a time-sampling record of the acceleration of a ground motion. The barcode is formed by plotting with respect to time. We analyze the complex jumping behavior in a barcode and an essential property of a high percentage occupation of the first set of dis-connectivity in the barcode from four strong earthquake records: 1940 El Centro earthquake, 1989 Loma earthquake, and two records of 1999 Chi-Chi earthquake. Through the comparisons of four earthquakes, we can observe that strong earthquake leads to large percentage of the first set of dis-connectivity.
文摘考虑模型不确定性和外部干扰等影响,基于径向基函数神经网络(radial basis function neural network,RBFNN)和改进的误差符号函数鲁棒积分(robust integral of signum error,RISE)技术,建立无人直升机(unmanned aerial helicopter,UAH)轨迹跟踪控制设计方案。首先,建立包含模型不确定性和外部干扰的UAH非线性系统模型,利用跟踪误差作为RBFNN输入信号估计由模型不确定性和外部干扰组成的复合扰动。其次,将滤波信号及其变化率权重组合作为RISE输入信号设计控制器,从而降低控制设计方案对UAH动力学模型的依赖程度。进而,借助Lyapunov稳定性理论分析整合后闭环跟踪误差系统的稳定性,并给出控制参数的选取方法。最后,借助现有文献中UAH系统模型,仿真与比较结果均说明所提控制算法的有效性和优越性。
