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Motive: School bullying (major) Childhood abuse (minor) Verdict: Life prison + 140 years: The Pearl High School shooting was a school shooting in the United States, which occurred on Octoat Pearl High School in Pearl, Mississippi.
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Teacher Jason Seaman and Ella were wounded when another student opened fire. Overall, it has been shown that samples tested at both high humidity and UV radiation condition suffered from the worst corona effects, whereas the low humidity with no UV condition has the least corona impacts.Noblesville west middle school shooting motive 123 william street, catskill, ny Based on EDX findings, it has been found that considerable reduction in Aluminum Trihydrate (ATH) content, which plays important role in erosion and tracking resistance, on the SiR samples surface. Results of SEM analysis show signs of aging in the SiR samples such as craters and cracks. For further understanding, the Scanning Electron Microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) have been conducted to investigate the intensity of surface damage. Furthermore, the outcomes show that both the UV radiation and humidity possess considerable effect on the hydrophobicity loss and recovery.
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It has been found that considerable hydrophobicity loss in all SiR samples is originated by corona aging test. The measurement is taken for 100 hours to quantify the hydrophobicity loss and recovery. After the experiment, the silicone rubber degradation is assessed using the static contact angle measurements. high humidity (80 to 90%), medium humidity (65 to 75%), and low humidity (30 to 40%).Īt each testing conditions, three silicone samples are tested simultaneously. Three humidity levels are considered, i.e. The humidity level inside the test chamber is increased through creating mist from deionized water using an ultrasonic humidifier. The UV radiation with 1 mW/cm2 intensity is generated from UVA-340 lamps. The experiment is performed inside a testing chamber where both the humidity level and UV radiation can be controlled. The gap distance between the surface of samples and the tip of the needle was set at 6 mm. Experiments are conducted by generating corona discharges using a high AC voltage of 10 kV applied to sharp needle electrodes on the surface of SiR samples for 24 hours. This motivates this study to investigate the impact of corona along with other weather conditions on the aging of SiR material. However, the literature to analyze the synergetic effect of corona and various weather conditions on the aging of silicone rubber material is still insufficient. Hence, extensive research has been conducted to understand the performance of silicone rubber material exposed to corona discharges under varied weather conditions. Moreover, severe environmental conditions like ultraviolet (UV) radiation and high humidity can accelerate the aging process caused by corona. Studying the SiR resistance to corona can be considered of great interest because the corona is one of the essential aging factors affecting the SiR insulators. These factors also may possess synergistic impact, which can aggravate the aging process. Some of these factors are related to weather, while others associated with system conditions, including electrical discharges generated from corona and/or dry band arcing. The aging of SiR insulators is dependent on several factors.
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However, SiR insulators are subjected to different stresses that may lead to their aging that may lead to the loss of their hydrophobicity property. The impetus for increasing SiR applications in outdoor insulators is its unique hydrophobicity ability. Silicone rubber (SiR) material has been utilized as a replacement to ceramic insulators. Supervisor(s): Jayaram, Sheshakamal - El-Hag, Ayman (Adjunct) Title: Effects of Corona Discharges on Silicone Rubber Samples under Severe Weather Conditions