A compact millimeter-wave on-chip sensor for dielectric detection is presented using gallium arsenide technology based on spoof surface plasmon polaritons (SSPPs). The proposed structure is developed ...from traditional half-mode substrate integrated waveguide (HMSIW) and its dispersion characteristics is analyzed through electromagnetic simulations. Consequently, the operating frequency and bandwidth of the on-chip sensor can be easily adjusted, which provides more flexibility for the practical application of the sensor. The linear sensing for relative dielectric constant of the film materials is acquired, with thickness-insensitive property. Moreover, the low coupling to the nearby components can be achieved due to the strong field confinement characteristics of the SSPPs, which is of great significance in the application scenarios of on-chip integrated circuits for the suppression of electromagnetic interference.
At present, it is the most important period to achieve the dual carbon goal and China 's economic transformation. The Chengdu-Chongqing twin-city economic circle plan is an important national policy ...proposed to promote the high-quality economic development of western China. However, due to the influence of geographical location, the frequent natural disasters in the economic circle of Chengdu and Chongqing have become a problem that cannot be ignored in the process of economic development. Many studies have discussed the relationship between natural hazards and economic development or between resource utilization and economic development in megacities, but little attention has been paid to the relationship between the three in intra-city development. This paper takes three cities in Chengdu-Chongqing Economic Circle as examples. The environment-resource-economy related evaluation factors are selected from various aspects such as hazard, vulnerability, susceptibility and disaster prevention and mitigation capacity. And establish a suitable evaluation system for disaster risk assessment. At the same time, our study demonstrates the uniqueness of the study by taking different disasters in different regions as entry points. The results of the study show that, although the natural hazards that often occur in cities are not the same, there is a strong repetition of the characteristics that characterize the disaster (extreme) high risk areas. The occurrence of natural disasters has a significant impact on infrastructure, human safety and economic development and recovery in areas of high human activity. Moreover, the progress of energy conservation and emission reduction varies greatly among cities due to factors such as geographic location and natural resources, and there are still cases of uneven development, lagging industrial innovation and high dependence on energy for economic development. These results can help mega-city clusters to provide opinions on economic development, energy saving and emission reduction, disaster prevention and control, and other aspects. Provide reference for the government to rationally plan the economic and industrial layout in the future. Remind the relevant departments in high-risk areas that they should enrich emergency response measures and strengthen hazard screening. Improve disaster prevention and control capacity to reduce losses and promote the coordinated development of environment-resources-economy. This is of great significance and practical value for better understanding of the environment, utilizing natural resources, avoiding and mitigating losses from natural disasters, and realizing the dual-carbon goal.
•Analysis and research from different impact factors, evaluation of different types of disasters in different cities.•The high-risk areas of disasters in each city have the same characteristics.•The occurrence of natural disasters will inevitably have a great impact on economic development and recovery.•Small cities have limited resources and focus on the development of pillar industries, affecting planning and policies.•Cities still suffer from uneven development and lagging industrial innovation.
•With the increase of erosion time and concentration, the changes law of apparent morphology, relative mass and ultrasonic wave velocity of RPC were revealed.•The variation law of compressive ...strength of RPC under different concentration erosion was revealed.•The variation law of compressive strength with the change of relative mass and ultrasonic wave velocity was revealed.•The erosion deterioration mechanism of RPC was revealed.
With the development of economy, the global waste plastics are gradually increasing. Adding recycled particles of waste plastics to concrete materials can effectively recover waste plastics, but it will also have an impact on the sodium sulfate resistanceperformance of concrete.In this work, at the macro level, the three concentrations (3%, 5%, and 7%)sodium sulfate resistance of recycled plastic concrete (RPC)andnormalconcrete (NC) were analyzed and evaluated from its appearance, relative mass, compressive strength, andultrasonic wave velocity. From the microscopic aspect, the microstructure and phase composition at 5% erosion concentration were tested and analyzed by SEM, XRD, and FT-IR.The deterioration mechanism of RPC eroded by sodium sulfate solution was analyzed.Results showed thatthe effect of sodium sulfate solution on RPC is similar to that of NC in the early stage. In the later stage of erosion, the erosion degree of RPC is less than that of NC. The deterioration characteristics of RPCwere mainly the development process of corners, edges, and then surface, and the rate of mass increase and ultrasonic wave velocity decrease gradually increasedwith the increase of erosion concentration and erosion time.Under 3% and 5% concentration erosion, the variation range of compressive strength was lower than that of normal concrete in the whole erosion stage, and under 7%concentration erosion, it showed the opposite effects.The compressive strength increased first and then decreased with the increase of mass change rate and the decrease of ultrasonic wave velocity.Taking the compressive strength as the damage parameter, the damage degree model of recycled plastic concrete eroded by sodium sulfate solution was deduced.The erosion deterioration mechanism of RPC was revealed by microstructure and phase analysis.
The severity of urban flood disasters in China is increasing due to the rapid development of global climate change and urbanization. Taking the sponge city pilot-Suining City as a case study, this ...paper utilizes GIS and RS technology to establish a comprehensive risk assessment model for rainstorm flood disasters. The model incorporates evaluation factors at various levels, including risk, sensitivity, vulnerability, and overall assessment. The study aims to evaluate and analyze the comprehensive risk of rainstorm flood disaster in Suining City. The findings indicate that the river's main areas are highly susceptible to rainstorms and prone to flood disasters, resulting in the formation of high-risk zones. The index model and methodology employed in this paper are suitable for the evaluation and zoning of the comprehensive risk of rainstorm and flood disasters in Suining City. This study provides a scientific foundation for the prevention and mitigation and management of flood disasters in the specified region. Additionally, it aims to assist other municipalities in enhancing their water conservancy infrastructure to effectively prevent flood disasters.
•The higher the frequency of rainstorm, the higher the risk of flood disaster.•In the area where the river flows through, its sensitivity to flood disaster is higher than that in other areas.•The probability of flood occurrence is closely related to the meteorological hydrology and vegetation cover in the area.•The index model (FDRI2) can better evaluate and divide the comprehensive risk of rainstorm and flood disasters in Suining City.•The closer the flood disaster occurrence point is to the water system, the greater the probability and scale of occurrence.
