Breaking the challenge of signal integrity using time-domain spoof surface plasmon polaritons

In modern integrated circuits and wireless communication systems/devices, three key features need to be solved simultaneously to reach higher performance and more compact size: signal integrity, interference suppression, and miniaturization. However, the above-mentioned requests are almost contradictory using the traditional techniques. To overcome this challenge, here we propose time-domain spoof surface plasmon polaritons (SPPs) as the carrier of signals. By designing a special plasmonic waveguide constructed by printing two narrow corrugated metallic strips on the top and bottom surfaces of a dielectric substrate with mirror symmetry, we show that spoof SPPs are supported from very low frequency to the cutoff frequency with strong subwavelength effects, which can be converted to the time-domain SPPs. When two such plasmonic waveguides are tightly packed with deep-subwavelength separation, which commonly happens in the integrated circuits and wireless communications due to limited space, we demonstrate theoretically and experimentally that SPP signals on such two plasmonic waveguides have better propagation performance and much less mutual coupling than the conventional signals on two traditional microstrip lines with the same size and separation. Hence the proposed method can achieve significant interference suppression in very compact space, providing a potential solution to break the challenge of signal integrity

THE ASSESSMENT INDICATORS OF TOURISM ECOSYSTEM HEALTH

The tourism ecosystem is the kind of special ecosystem in which destination residents, the external tourists and its surrounding environment are tightly interacted, and it is also the nature -economy-society complex that mainly carries out the tourism activity. As a multiplexed system, the tourism ecosystem also has the healthy problems. From the angle of forced system, this paper analyzes reasons of the system’s healthy problems and successfully builds tourism ecosystem health evaluating indicator system with the utilization pressure, the state, the response model. Besides, this paper carries on the synthetic evaluation and the analysis to the tourism ecosystem health's indicator system through bestowing on the weights, which proposes the new research mentality for the tourism sustainable development. Key words: tourism ecosystem, health, indicator system, evaluatio

MHD Simulation of Prominence-Cavity System

We present magnetohydrodynamic simulation of the evolution from quasi-equilibrium to onset of eruption of a twisted, prominence-forming coronal magnetic flux rope underlying a corona streamer. The flux rope is built up by an imposed flux emergence at the lower boundary. During the quasi-static phase of the evolution, we find the formation of a prominence-cavity system with qualitative features resembling observations, as shown by the synthetic SDO/AIA EUV images with the flux rope observed above the limb viewed nearly along its axis. The cavity contains substructures including “U”-shaped or horn-like features extending from the prominence enclosing a central “cavity” on top of the prominence. The prominence condensations form in the dips of the highly twisted field lines due to runaway radiative cooling and the cavity is formed by the density depleted portions of the prominence-carrying field lines extending up from the dips. The prominence “horns” are threaded by twisted field lines containing shallow dips, where the prominence condensations have evaporated to coronal temperatures. The central “cavity” enclosed by the horns is found to correspond to a central hot and dense core containing twisted field lines that do not have dips. The flux rope eventually erupts as its central part rises quasi-statically to a critical height consistent with the onset of the torus instability. The erupting flux rope accelerates to a fast speed of nearly 900 km/s and the associated prominence eruption shows significant rotational motion and a kinked morphology

Synthetic Evaluation on Health Quality of Liaoning Tourism Ecosystem

The tourism ecosystem is the kind of special ecosystem in which destination residents, the external tourists and its surrounding environment are tightly interacted, and it is also the nature -economy-society complex that mainly carries out the tourism activity. As a multiplexed system, the tourism ecosystem also has the healthy problems. From the angle of forced system, this paper analyzes reasons of the system’s healthy problems of Liaoning province and successfully builds tourism ecosystem health evaluating indicator system with the utilization pressure, the state, the response model. Besides, this paper carries on the synthetic evaluation and the analysis to the tourism ecosystem health's indicator system through bestowing on the weights, and which proposes the new research mentality for the tourism sustainable development in Liaoning province.Key words:  tourism ecosystem; health; indicator system; evaluatio