21 research outputs found
Z Company’s Financial Statements Analysis ——Based on Harvard Analytical Framework
2015年6月,最新发布的《BP世界能源统计年鉴》显示:虽然中国的能源消费增长已经降至1998年以来的最低水平,但是中国仍为全世界最大的能源增长市场并创下一次性能源消费连续14年增长的记录。 2015年,中国原油消费量为547.37百万吨,占全球原油消费的12.36%;中国天然气消费量为1,855.1亿立方米,占全球天然气消费的5.47%。随着我国经济的快速增长,对石油的刚性需求日趋强烈,中国政府、中国能源企业以及社会对中国石油安全问题越发重视。特别是对于中国石油公司,其承受着巨大的保障供给、节能减排以及全球合作三重压力。 本文选取中国最大的海上原油及天然气生产商、也是全球最大的油气勘探及...In June 2015, the latest BP World Energy Statistics revealed that the growth of Chinese energy consumption has dropped to the lowest level since 1998, but China was still the world’s largest energy market in growth and created a one-time energy consumption growth record of 14 years in a row. In 2015, the raw petroleum consumption of China is 547.37MT, which occupies 12.36% of global raw petroleum...学位:工商管理硕士院系专业:管理学院_工商管理硕士(工商管理硕士)学号:1792014115068
Elementary Study on the Geochemical Behaviour of Cu,Pb,Cd in the Jiulong Estuary,Xiamen
于2006年4月采集厦门九龙江河口水样,测定其溶解、颗粒态Cu、Pb、Cd及相关水化学参数的含量.结果表明,厦门九龙江河口区表层海水中溶解态Cu、Pb、Cd的含量范围分别为0.96~2.16、1.02~2.49及0.16~0.44μg/L,平均值分别为1.52、1.60和0.34μg/L;颗粒态Cu、Pb、Cd的含量范围分别为0.26~3.40、0.11~6.00、0.000 4~0.028 0μg/L,平均值分别为1.08、1.61和0.0064μg/L.在垂直变化上,除Cd变化较小外,Cu和Pb浓度随深度增加而逐渐升高,其贡献主要来自底部沉积物再悬浮.九龙江河口溶解和颗粒态Cu、Pb、Cd的平均入海通量分别为6.57、6.91、1.47、4.66、6.96和0.027 kg/d.九龙江河口区表层水体中Cu、Pb、Cd的表观分配系数(Kd)分别为4.09、2.84和0.10 L/kg.3种金属在研究海域的固-液分配机制主要受"颗粒物浓度效应"影响,而Cd在低盐度区受到"盐度效应"的影响.Seawater samples collected from 7 stations of the Jiulong Estuary in April 2006 and analyzed for dissolved and particulate heavy metals including Cu,Pb and Cd.The range of concentrations of dissolved Cu,Pb,Cd were 0.96~2.16,1.02~2.49,0.16~0.44 μg/L,with average values of 1.52,1.60,0.34 μg/L,separately;while that of particulate phases were 0.26~3.40,0.11~6.00,0.000 4~0.028 0 μg/L,with mean values of 1.08,1.61,0.006 4 μg/L,separately.The vertical profile of three metals were also measured and was found that except the less change of Cd,the concentrations of copper and lead increased with depth.The main contributions were thought to be the re-suspended particles from surface sediments.The average flux of dissolved Cu,Pb and Cd from Jiulong River to coastal sea were estimated to be about 6.57,6.91,1.47 kg/d separately,while that of particulate phases were 4.66,6.96,0.027 kg/d,separately.Distribution coefficients(Kd) for metals between particulate(>0.45 μm) and dissolved(Pb>Cd in average.The average Kd of Cu,Pb and Cd were 4.09,2.84,0.105 L/kg,separately.The distribution of dissolved and particulate metals in studied area are mainly affected by the operation of the "Particle Concentration Effect",especially for Pb and Cu when salinity was above 11 ‰,while the inverse linear Kd versus salinity relationship for Cd was found when salinity below 11 ‰,which might be due to the operation of the "Salinity Effect".国家自然科学基金(40306012);; 福建省重点科技项目(2005Y021);; 福建省海洋与渔业局科技项目;; 厦门大学科技创新项目资
中国被子植物濒危等级的评估
本文基于文献和标本信息收集以及专家提供的数据,运用IUCN濒危物种红色名录方法首次对中国范围内所有已知被子植物进行灭绝风险评估。结果显示,在评估的30,068种被子植物中,灭绝等级(含灭绝、野外灭绝、地区灭绝)共计40种;受威胁等级(极危、濒危、易危)3,363种,受威胁比例为11.18%。从空间分布看,我国受威胁被子植物主要集中分布在西南地区以及台湾、海南等岛屿,且主要分布在中低海拔地区。对受威胁物种的分析结果表明,包括原生植被破坏在内的生境丧失及破碎化是我国被子植物濒危的首要因子,涉及约84.1%的受威胁物种;过度采挖和物种内在系统问题位列致危因子的第二、三位,分别涉及38%和14%的物种。其他的致危因子包括外来入侵种在内的种间竞争、环境污染、自然灾害和全球气候变化等。一个物种的致危因子往往是多方面的。本次评估与2004年红色名录相比,生境变化、实施保护措施及分类学新修订使一些物种的濒危等级发生了变化,这也印证了红色名录是一个动态的系统,需要根据最新信息进行更新,以便为生物多样性保护提供实时准确的基础数据
中国高等植物受威胁物种名录
2008年,环境保护部和中国科学院联合启动了《中国生物多样性红色名录——高等植物卷》的编制工作。通过这项工作,我们依据IUCN濒危物种红色名录标准对中国野生高等植物的濒危状况进行了全面评估,编制了中国高等植物红色名录。2013年9月,该名录以环境保护部、中国科学院第54号公告形式发布,即《中国生物多样性红色名录—
