287 research outputs found

    Adaptive Neural Network Robust Control for Space Robot with Uncertainty

    Get PDF
    The trajectory tracking problems of a class of space robot manipulators with parameters and non-parameters uncertainty are considered. An adaptive robust control algorithm based on neural network is proposed by the paper. Neutral network is used to adaptive learn and compensate the unknown system for parameters uncertainties, the weight adaptive laws are designed by the paper, System stability base on Lyapunov theory is analysised to ensure the convergence of the algorithm. Non-parameters uncertainties are estimated and compensated by robust controller. It is proven that the designed controller can guarantee the asymptotic convergence of tracking error. The controller could guarantee good robust and the stability of closed-loop system. The simulation results show that the presented method is effective

    The Formation and Problem of a Mass Consumption Society in China

    Get PDF

    Data Source and Converter for 1990−1995−2000 Linked China−Japan International Input−Output Table

    Get PDF
    The purpose of this research is analyzing the recent trend and structural changes of the mutual−dependence relation of China and Japan, by estimating China−Japan International Input−Output Table of 2000 and creating 1990−1995−2000 Linked China−Japan International Input−Output Table at the same time. For the preparation of China−Japan International Input−Output Table, examining the common section classification (Converter) is the preferential topic. The setting of this converter in the input−output table is a thing about intertemporal and different economic systems. In this paper, by explaining China−Japan International Input−Output Table’s estimation and the statistic data and clarifying the differences between these statistical data and classification methods of different years, the setting of common section classification is examined

    Propagating Surface Plasmon Polaritons: Towards Applications for Remote-Excitation Surface Catalytic Reactions

    Get PDF
    Plasmonics is a well-established field, exploiting the interaction of light and metals at the nanoscale; with the help of surface plasmon polaritons, remote-excitation can also be observed by using silver or gold plasmonic waveguides. Recently, plasmonic catalysis was established as a new exciting platform for heterogeneous catalytic reactions. Recent reports present remote-excitation surface catalytic reactions as a route to enhance the rate of chemical reactions, and offer a pathway to control surface catalytic reactions. In this review, we focus on recent advanced reports on silver plasmonic waveguide for remote-excitation surface catalytic reactions. First, the synthesis methods and characterization techniques of sivelr nanowire plasmonic waveguides are summarized, and the properties and physical mechanisms of plasmonic waveguides are presented in detail. Then, the applications of plasmonic waveguides including remote excitation fluorescence and SERS are introduced, and we focus on the field of remote-excitation surface catalytic reactions. Finally, forecasts are made for possible future applications for the remote-excitation surface catalysis by plasmonic waveguides in living cells

    Soil Organic Carbon Pool and the Production of Goji Berry (Lycium barbarum L.) as Affected by Different Fertilizer Combinations Under Drip Fertigation

    Get PDF
    Goji berries (Lycium barbarum L.), widely planted in arid to semi-arid regions, are a functional resource characterized by a homology of medicine and food. Changing extensive water and fertilizer management practices to drip fertigation is one of the most cost-effective ways to achieve the sustainable development of the Goji berry industry. This study explores the effects of different fertilizer combinations on the soil organic carbon pool and L. barbarum yield under drip fertigation in Ningxia, northwestern China. A two-year field experiment (2017–2019) was conducted using different levels of drip nitrogen (40, 60, and 80 mg L−1) and phosphorus (10, 20, and 30 mg L−1) fertigation. Compared with traditional manual fertilization (control), soil organic carbon contents in the 0–20, 20–40, and 40–60 cm layers increased by 33.6–144.4, 39.6–136.8, and 14.0–73.6%, respectively, across all fertigation treatments. With increasing levels of fertigation, the easily oxidizable organic carbon content increased most prominently in the 0–20 cm soil layer and reached the highest value (538 mg kg−1) under treatment with 60 mg L−1 nitrogen plus 10 mg L−1 phosphorus. The microbial biomass carbon contents in the 20–60 cm soil layer was markedly higher under treatment with 60 mg L−1 nitrogen plus 30 mg L−1 phosphorus compared with other treatments. Fertigation increased the soil carbon pool management index and L. barbarum yield. The highest two-year average yield (13,890 kg ha−1) was obtained under treatment with 60 mg L−1 nitrogen plus 30 mg L−1 phosphorus. These findings suggest that drip fertigation with 60 mg L−1 nitrogen plus 30 mg L−1 phosphorus is the optimal practice for carbon sequestration and sustainable production of L. barbarum in arid regions

    Compilation of China-Japan International Input-Output Table by Economate I-O

    Get PDF
    • …
    corecore