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儿童多环芳烃个体暴露特征及健康风险评价 被引量:4
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作者 王飞 孙如峰 +6 位作者 韩斌 姬亚芹 张楠 韩金保 王婉 白志鹏 杨文 《南开大学学报(自然科学版)》 CAS CSCD 北大核心 2013年第6期48-57,共10页
为了解儿童多环芳烃(PAHs)的暴露特征和健康风险,选取36名9~12岁的天津小学生作为研究对象,于2010年11~12月采集其个体暴露和室内环境PM2.5样品,分析了样品中载带的PAHs浓度,得到儿童PAHs个体暴露特征,然后应用比值法和因子分析法对... 为了解儿童多环芳烃(PAHs)的暴露特征和健康风险,选取36名9~12岁的天津小学生作为研究对象,于2010年11~12月采集其个体暴露和室内环境PM2.5样品,分析了样品中载带的PAHs浓度,得到儿童PAHs个体暴露特征,然后应用比值法和因子分析法对儿童个体暴露的PM2.5中PAHs进行源解析,最后应用增量终生致癌风险对儿童PAHs暴露进行健康风险评价.结果显示,儿童PAHs个体和室内的暴露浓度分别为(90±34)ng/m3和(79.0±41)ng/m3,芳烃环数集中在4~6环;PM2.5中PAHs儿童个体暴露最主要来源为燃煤,其次是机动车尾气、室内烹调、吸烟及卫生球挥发等;天津儿童对PM2.5中PAHs的呼吸暴露存在较大潜在健康风险. 展开更多
关键词 多环芳烃 PM2 5 儿童暴露 来源解析 健康风险评价
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International Corporate Taxation at a Crossroads
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作者 Sol Picciotto 《Belt and Road Initiative Tax Journal》 2022年第2期92-101,共10页
Transnational corporations(TNCs)act as unitary firms in an increasingly globalised economy,but taxes on their profits are levied by national states.Hence,international tax rules have from the start been riven by contr... Transnational corporations(TNCs)act as unitary firms in an increasingly globalised economy,but taxes on their profits are levied by national states.Hence,international tax rules have from the start been riven by contradictory approaches:ei-ther to determine the taxable profits attributable to each separate constituent entity of the TNC in their jurisdiction by comparing them with independent firms conducting a similar business,or to tax an appropriate share of the TNC’s global profits appor-tioned by factors reflecting its activities within the jurisdiction.The separate entity principle became dominant,especially with the adoption of the OECD Transfer Pricing Guidelines in 1995,but it gave a perverse incentive to TNCs to devise tax avoidance strategies,based on attributing high levels of profit to entities in countries where they would be taxed at low rates.The project on base erosion and profit shifting(BEPS)was mandated by the G20 to reform these rules so that TNCs could be taxed where their activities occur,signaling a return to the unitary principle.The latest proposals now adopt the principle of unitary taxation of TNCs,together with technical standards for formulary apportionment,but only as an overlay on top of existing rules based on the incompatible independent entity principle.A stable foundation for international tax depends on resolving this dilemma and agreeing a fair and balanced allocation of rights to tax TNCs’profits based on their real activities in each jurisdiction. 展开更多
关键词 Transnational corporations Unitary taxation Formulary apportion-ment Separate entity principle Arm’s length principle
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