Alaska geology and plate tectonics have not been well understood due to an active Yakutat plate, believed to be part of the remains of an ancient Kula plate, not being acknowledged to exist in Alaska. It is positioned...Alaska geology and plate tectonics have not been well understood due to an active Yakutat plate, believed to be part of the remains of an ancient Kula plate, not being acknowledged to exist in Alaska. It is positioned throughout most of southcentral Alaska beneath the North American plate and above the NNW subducting Pacific plate. The Kula？ plate and its eastern spreading ridge were partially ＂captured＂ by the North American plate in the Paleocene. Between 63 Ma and 32 Ma, large volumes of volcanics erupted from its subducted N-S striking spreading ridge through a slab window. The eruptions stopped at 32 Ma, likely due to the Pacific plate fiat-slab subducting from the south beneath this spreading ridge. At 28 Ma, magmatism started again to the east; indicating a major shift to the east of this ＂refusing to die＂ spreading ridge. The captured Yakutat plate has also been subducting since 63 Ma to the WSW. It started to change to WSW fiat-slab subduction at 32 Ma, which stopped all subduction magmatism in W and SW Alaska by 22 Ma. The Yakutat plate subduction has again increased with the impact/joining of the coastal Yakutat terrane from the ESE about 5 Ma, resulting in the Cook Inlet Quaternary volcanism of southcentral Alaska. During the 1964 Alaska earthquake, sudden movements along the southcentral Alaska thrust faults between the Yakutat plate and the Pacific plate occurred. Specifically, the movements consisted of the Pacific plate moving NNW under the buried Yakutat plate and of the coastal Yakutat terrane, which is considered part of the Yakutat plate, thrusting WSW onto the Pacific plate. These were the two main sources of energy release for the E part of this earthquake. Only limited movement between the Yakutat plate and the North American plate occurred during this 1964 earthquake event. Buried paleopeat age dates indicate the thrust boundary between the Yakutat plate and North American plate will move in about 230 years, resulting in a more ＂continental＂ type megathrust earthquake for sou展开更多
[目的]了解女女性行为人群(women who have sex with women,简称WSW)性行为特征和艾滋病(AIDS)、性传播疾病知识水平,为今后对该人群健康教育和行为干预提供理论依据。[方法]2013年1～4月,对聊城"女爱同家园"部分WSW人群进行...[目的]了解女女性行为人群(women who have sex with women,简称WSW)性行为特征和艾滋病(AIDS)、性传播疾病知识水平,为今后对该人群健康教育和行为干预提供理论依据。[方法]2013年1～4月,对聊城"女爱同家园"部分WSW人群进行定性访谈。[结果]合计调查WSW 38人,平均年龄24.72岁,单一同性恋10人,同性恋占主导17人,双性恋8人,不确定3人;与女朋友(女性配偶)同居8人、不定期同居12人、与异性同居2人、单身16人;33人了解血液传播、性传播、母婴传播3种传播途径;24人认为安全套可能预防艾滋病病毒(HIV)感染;获取AIDS知识的主要途径包括网络宣传(35人)、电视宣传(31人)、圈内同伴宣传(25人)、免费的宣传资料(22人)、咨询服务(20人);发生首次同性性行为的年龄为17.12岁,首次性伴为男性者6人,同性者26人;平均同性性伴数3个。29人发生性行为时能采用自认为安全卫生的防护措施。访谈24人,5人在最近1年出现过性病相关症状,其中2人选择到性病专科门诊和综合性医院就诊,其中2人选择私人医疗机构进行就诊,1人到药店买药自己治疗;3人曾患过细菌性阴道炎。[结论]WSW中存在多性伴现象,缺乏健康知识和防护意识,存在感染AIDS性病的危险因素。展开更多
文摘Alaska geology and plate tectonics have not been well understood due to an active Yakutat plate, believed to be part of the remains of an ancient Kula plate, not being acknowledged to exist in Alaska. It is positioned throughout most of southcentral Alaska beneath the North American plate and above the NNW subducting Pacific plate. The Kula？ plate and its eastern spreading ridge were partially ＂captured＂ by the North American plate in the Paleocene. Between 63 Ma and 32 Ma, large volumes of volcanics erupted from its subducted N-S striking spreading ridge through a slab window. The eruptions stopped at 32 Ma, likely due to the Pacific plate fiat-slab subducting from the south beneath this spreading ridge. At 28 Ma, magmatism started again to the east; indicating a major shift to the east of this ＂refusing to die＂ spreading ridge. The captured Yakutat plate has also been subducting since 63 Ma to the WSW. It started to change to WSW fiat-slab subduction at 32 Ma, which stopped all subduction magmatism in W and SW Alaska by 22 Ma. The Yakutat plate subduction has again increased with the impact/joining of the coastal Yakutat terrane from the ESE about 5 Ma, resulting in the Cook Inlet Quaternary volcanism of southcentral Alaska. During the 1964 Alaska earthquake, sudden movements along the southcentral Alaska thrust faults between the Yakutat plate and the Pacific plate occurred. Specifically, the movements consisted of the Pacific plate moving NNW under the buried Yakutat plate and of the coastal Yakutat terrane, which is considered part of the Yakutat plate, thrusting WSW onto the Pacific plate. These were the two main sources of energy release for the E part of this earthquake. Only limited movement between the Yakutat plate and the North American plate occurred during this 1964 earthquake event. Buried paleopeat age dates indicate the thrust boundary between the Yakutat plate and North American plate will move in about 230 years, resulting in a more ＂continental＂ type megathrust earthquake for sou
文摘[目的]了解女女性行为人群(women who have sex with women,简称WSW)性行为特征和艾滋病(AIDS)、性传播疾病知识水平,为今后对该人群健康教育和行为干预提供理论依据。[方法]2013年1～4月,对聊城"女爱同家园"部分WSW人群进行定性访谈。[结果]合计调查WSW 38人,平均年龄24.72岁,单一同性恋10人,同性恋占主导17人,双性恋8人,不确定3人;与女朋友(女性配偶)同居8人、不定期同居12人、与异性同居2人、单身16人;33人了解血液传播、性传播、母婴传播3种传播途径;24人认为安全套可能预防艾滋病病毒(HIV)感染;获取AIDS知识的主要途径包括网络宣传(35人)、电视宣传(31人)、圈内同伴宣传(25人)、免费的宣传资料(22人)、咨询服务(20人);发生首次同性性行为的年龄为17.12岁,首次性伴为男性者6人,同性者26人;平均同性性伴数3个。29人发生性行为时能采用自认为安全卫生的防护措施。访谈24人,5人在最近1年出现过性病相关症状,其中2人选择到性病专科门诊和综合性医院就诊,其中2人选择私人医疗机构进行就诊,1人到药店买药自己治疗;3人曾患过细菌性阴道炎。[结论]WSW中存在多性伴现象,缺乏健康知识和防护意识,存在感染AIDS性病的危险因素。
