Hurricanes Irma and Maria caused catastrophic damages across the Caribbean Islands during the 2017 hurricane season. After the storms, a joint United States–Japanese team investigated coastal impacts in the US Virgin Islands, which are composed of the islands of St. Thomas, St. John, Water Island, and St. Croix. Coastal inundation was dominated by wave run-up in almost all locations, with many locations showing inundation exceeding 4-m elevation from mean sea level. In contrast, maximum elevations recorded at tide gauges did not exceed 1 m at any location. Coastal damage was relatively minor for such strong hurricanes because of the lack of heavy development at low elevations on the most exposed coastlines. Many moored vessels were destroyed, and coastal structures and infrastructure within the inundation region suffered significant damage. However, few large structures experienced catastrophic losses from coastal inundation. In contrast, strong winds caused extensive structural damage throughout the US Territory. Evidence was seen for past inundation of the coastline, but could not be conclusively linked to any particular events.
This paper presents a framework to assess the potential hurricane damage risks to residential construction. Studies show that hurricane wind, frequency and/or hurricane-induced surge may change as a result of climate change; therefore, hurricane risk assessments should be capable of accounting for the impacts climate change. The framework includes a hurricane wind field model, hurricane-induced surge height model and hurricane vulnerability models. Three case study locations (Miami-Dade County, FL; New Hanover County, NC and Galveston County, TX) are presented for two types of analyses: annual regional loss estimation and event-based regional loss estimation. Demographic information, such as median house value and changes in house numbers, and distribution of houses for different exposures, is used to estimate the time-dependent probability of damage with or without possible climate change-induced change in wind speed, frequency and/or surge height. Through both analyses, it was found that climate change may have a significant impact on regional hurricane damage losses.
Abstract To accurately predict and master the actual combat capacity of the weapon system, the paper took a self-propelled artillery as the research subject and built the completely artillery system virtual prototype based on the dynamic theory. Extracted the dynamic characteristics of firepower system, running system and drive system, the performance variation and failure mechanism of the artillery system were studied by using the method of theoretical analysis, simulation and physical experiment. The paper built the fault evaluation and life prediction model in the process of shooting and drivingby combining data fusion, deep learning, etc. The performance evaluation and the prediction of fault of the full artillery system were realized. It can provide references for the life evaluation and prediction of complex equipment system.
Adding sodium sulfate to limestone slurry can increase SO2 removal efficiency. In this paper, sodium-enhanced limestone flue gas desulfurization(FGD) tests were conducted in rotating-stream tray scrubber. Changes of SO2 removal efficiency and pH value with time were experimentally studied and, at different pH range, the dissolution rates of limestone etc. were analyzed. The effects of plate number on SO2 removal efficiency and pressure drop were investigated at temperature approximated to industrial operating value. The average plate efficiencies were calculated. According to the experimental results, increasing plate number could increase SO2 removal efficiency, but the average plate efficiency decreased. Under the experimental conditions, when the plate number was increased from 1 to 4, the removal efficiency was increased from 25.5% to 48.6% at the liquid-to-gas ratio of 4 L/m3, but the average plate efficiency was decreased from 25.5% to 15.3%. The equation of the relation between the average plate efficiency and plate number was obtained.
This paper proposes a specific architecture of campus security management system based on WCF service of SOA and RFID technology, aiming at meeting the security and scalability requirement of the distributed environment of campus security management system. With the help of WCF service models, the underlying interaction among database, data access layer, RFID device information transaction and business logic processing are packaged seamlessly. Then the WCF service models provide platform-independent service to .Net MVC Framework Controller, which could be replaced by any type of caller, separating the presentation and implementation of this system. Because of the advantages of reducing the degree of coupling and greatly enhancing the security, scalability and reliability of the system, this architecture has been one of the recommended trends of software architecture.
This paper presents a framework to assess the potential for increased hurricane risk to residential construction under various wind speed increase scenarios due to climate change. The framework includes a probabilistic hurricane wind field model and a hurricane damage model. A case study of Miami-Dade County, Florida is presented to illustrate the framework. Demographic information, such as median house value and changed house numbers, and distribution of houses on different exposure, are used to estimate the probable damage with or without the increased wind speed. This study finds that climate change may have a substantial impact on the damage and loss estimation in coastal areas.
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