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A patent-pending 16 channel adaptive antenna based on active frequency selective surface is proposed. A Zigbee system built with this antenna is realized and tested in the real world. And serial experiments are taken. The results show that this antenna has a better performance than a pair of dipoles. At some places, this antenna can offer a stable link when the dipoles based system loses many packages...
In this paper, a modified spiking neuron circuit (MSNC) with memory threshold is presented. The MSNC can store the potential of the threshold signal at the latest firing time as threshold under the control of pulse, implying the memory of threshold. We extend the definition of the least common multiple to obtain the iterative map of firing phase of the MSNC. By studying the iterative map of firing...
With the popularity of bandwidth-intensive mobile applications and mobile devices, the data traffic is increasing fast nowadays. This poses huge burden to the Internet service providers (ISPs) to support such wireless data traffic as they need to invest on developing advance networks, e.g., 4G, or expending the capacity of the current networks in a much faster pace. One way to keep up financing such...
One kind of good drought monitoring technology (DMT) can help to detect and characterize drought conditions, and reduce adverse drought impacts. We evaluate how a DMT for China, based on a land surface model, would perform. The land surface model current soil moisture, runoff and evaporation. The DMT incorporates the Palmer drought severity index (PDSI) and soil moisture deciles taken from the LSM...
This work concerns some climate models in the point of view of controllability. We obtain by the Kakutani's fixed point theorem and the controllability property of the linear parabolic equation that the climate system is null controllable both in the case with interior control and the case with boundary control.
In this study, we analyze Net Primary Productivity from 51-year (1950-2000) offline simulations using an Australian land-surface model CABLE (CSIRO Atmosphere Biosphere Land Exchange). The model annual NPP climatology with the estimated 2001 annual NPP from what was derived from a process model driven by remote sensing in deriving China NPP at 1-km resolution. The CABLE results are highly comparable...
China education-economy system is typical complex system. Both traditional region economic theory and complex social economic theory were used to analyze it. The econometric equation of system constituents' interactions was built based on the Cobb-Douglas production function. The integrated system model was built according to system dynamics. The simulation indicates that China education-economy system...
China education-economy system was analyzed by traditional region economic theory and complex social economic theory. The econometric equation of system elements interaction was built based on the Cobb-Douglas production function. The simulation model of China education-economy system was built by combining econometrics and system dynamics methods. The comparison with historical data proved the correctness...
In the transaction process, the effective negotiation may cause more profits. In B2C and C2C, sellers only can use the fixed price or auction because they have no time and energy to bargain with buyers who are random on time and quantity, which reduces the benefits and successful transaction rate. This article established a negotiation model to solve this problem. This model conforms to the general...
Project risk element transmission theory puts forward a new idea of research on project risk management. This paper combined with state transfer diagram, analysed enterprise multi-project management, made concrete exposition on the thought of project chain with different risk element kinds. A tetrahedral structure model of enterprise project chain risk element transmission and controlling mechanism...
In this study we examine the revenue expenditure relationships within public and private research and doctoral institutions. Results suggest tight relationships between some revenue and expenditure categories. Instructional expenditures are significantly influenced by revenues from tuition and fees, governmental appropriations (for public institutions), and grants and contracts. These results are...
In this paper, we examine the cascading failure on BA networks with scale-free property based on a load redistribution rule. Assuming that the robustness is quantified by the critical threshold Tc, at which a phase transition occurs from normal state to collapse, we find the strongest robustness against cascading failures in the case of alpha =1, which is a tunable parameter in our model. We further...
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