| 1 | Cadmium and lead effects on chlorophyll fluorescence,chlorophyll pigments and proline of Robinia pseudoacacia显示文摘Heavy metal contamination is one of the most important abiotic stresses affecting physiological activities of plants.We investigated the effects of cadmium(Cd) and lead(Pb) on chlorophyll fluorescence(Fv/Fm,Fo,and Fm),photosynthetic pigments(chlorophyll a and b),and proline in one-year-old seedlings of Robinia pseudoacacia.The seedlings were treated twice over a period of 10 days with Cd and Pb at concentrations of 0,250,500,1000 and2000 mg L-1.Saline solution containing Cd and Pb was sprayed on the leaves.Chlorophyll and proline contents were measured after 10 days.Chlorophyll fluorescence of R.pseudoacacia was affected slightly by high concentrations(1000,2000 mg L-1) of Cd and Pb.Chlorophyll a and a/b increased at 1000 and 2000 mg L-1of Cd and proline content of leaves was similar in all treatments of Cd and Pb.Our results indicated that photosynthetic sensitivity of R.pseudoacacia to Cd and Pb contamination was weak.Photosystem II chlorophyll pigments were not damaged by Pb and Cd stress.We conclude that chlorophyll fluorescence along with chlorophyll and proline contents are useful indicators of Cd and Pb stresses in R.pseudoacacia which widely planted in urban polluted regions in Iran. | A.Dezhban A.Shirvany P.Attarod M.Delshad M.Matinizadeh M.Khoshnevis | 2015 | Journal of Forestry Research2015，26，2： | 3 |
| 2 | 低成本化学驱油的设计与优选显示文摘在原油价格较低的情况下。化学驱油主要的问题是降低成本。在美国采用化学驱油方法提高原油产量的主要对象是轻质油油田。进行了与经济模型相结合使用模拟的结果来优选表面活性剂和聚合物化学驱油的设计。不同的表面活性剂浓度对工程效益有显著的影响。最理想的结果是聚合物和表面活性剂二者是低浓度并同时注进油层。有时选用低张力聚合物。设计的敏感性分析表明,最重要的经济变量是油价。折扣率。经营费用和化学制剂的价格。在敏感性分析中,也包括了不同聚合物的浓度,油田的实际渗透率和垂直与水平渗透率的比率。蒙特卡伦模拟就是用作对表面活性剂/聚合的注水风险评估的演示。结论表明,应用实际的油藏模拟与现代工艺技术(如水平井积最优化经济评价法,是能改进化学注水工程的设计。 | W.Wu A.vaskas M.Delshad 史权 | 1997 | 国外油田工程1997，13，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员