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Search Results: 1 - 10 of 131106 matches for " 韩志萍 "
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从兼容的角度谈分类法面临的挑战

图书情报工作 , 1997,
Abstract: ?认为图书分类法实现兼容面临着建立标准的分类法机读版本,分类法结构、语义及标引规则的规范化和分类法向组配化发展等三个问题;并就如何解决这三个问题提出了看法。
机编文摘的发展

图书情报工作 , 1994,
Abstract: ?本文阐述了机编文摘发展过程的两个阶段:自动摘录阶段和自动文摘阶段。全面系统地介绍了机编文摘的发展过程,并就机编文摘的发展前景作了展望。
中国股市个体投资者羊群行为影响因素分析
李新路,
中央财经大学学报 , 2007,
Abstract: ?中国股市投资者表现出显著的羊群行为,心理因素是投资者羊群行为产生的主要原因,情绪、股票历史收益率和股票规模等也是影响投资者行为的重要因素。本文利用我国股市个体投资者交易数据,对影响投资者羊群行为的因素进行了实证研究,探讨了我国股市个体投资者羊群行为的特征。
芦竹对不同重金属耐性的研究
,胡正海
应用生态学报 , 2005,
Abstract: 研究芦竹(arundodonax)在不同重金属污染湿地中的耐毒性能,测定了不同生长时段芦竹的生物性状和叶绿素含量,以及土壤中重金属含量的变化.结果表明,芦竹分别在浓度为100mg·kg-1左右的cucu2+、pb2+、cd2+、zn2+、ni2+、hg2+和50mg·kg-1以下的cr6+污染环境中能正常成活,在40d的生长期内,植物体内叶绿素有不同程度降低,下降比率在20%~56%,植物出现叶片软化,叶尖枯黄等症状,但植株仍呈现增长趋势.与对照植物相比较,在重金属胁迫下,植株细长,茎、叶呈黄绿色,除cr6+、hg2+外,植物高度基本不受重金属胁迫的影响.芦竹在高浓度(100mg·kg-1)cr6+污染环境中耐性较弱,表现出生长缓慢,部分地下茎腐烂,叶片短时间内出现枯萎等症状.结果还表明,土壤中重金属浓度随植物生长期增长而降低,除被植物吸收,植物挥发外,还存在着重金属向根际圈环境迁移的趋势,根周边湿土中重金属含量,明显高于试验缸外围湿土中重金属含量.可以认为,芦竹具有生物量大,根系发达,适应性强等特点,对修复湿地重金属污染蕴藏着巨大潜力,研究芦竹在植物修复技术中的应用,具有一定的现实意义.
万家寨引黄工程北干资本金测算
,史艳阳,
人民黄河 , 2003,
Abstract: ?资本金测算可根据项目所有的费用和预期的财务收益,测算项目在能维持正常运行并符合现行财务税收制度和银行信贷条件下的最大贷款能力与所需的资本金额度,是确定项目资金筹措方案、对项目进行科学财务评价的重要依据.以山西省现行的水价和电价为基础,对几种拟定的筹资方案条件下项目的最大贷款能力和相应资本金额度进行了测算,并结合受水区用水户水价承受能力分析结果,确定了引黄工程北干的资金筹措方案为:国家投资比例为40%,省内自筹比例为40%,贷款比例为20%.
一种消除九孔鲍苗细菌性病原的无公害绿色生物方法的研究
,蔡俊鹏,,
海洋科学 , 2006,
Abstract: 从海洋环境中分离出4株蛭弧菌(Bdellovibriosp.),并对34株九孔鲍(Haliotisdiversicolor)苗细菌性病原进行了裂解试验。结果表明,Bh04-4、Bh04-41a、Bh04-A+和Bh04-1f等4株蛭弧菌分别可裂解11株、13株、22株和28株病原菌,裂解率为32.4%、38.2%、64.7%和87.5%;4株共同作用,则可裂解32株病原菌,裂解率高达94.1%。研究结果展示了应用蛭弧菌控制九孔鲍苗细菌性病原的可行性。
蛭弧菌消除海产品中潜在致病性弧菌的研究
蔡俊鹏,,,
食品科学 , 2006,
Abstract: ?噬菌蛭弧菌具有裂解病原菌的特殊功效,可以用作生物净化因子。本实验从海洋环境中分离到4株bh04系列蛭弧菌(bh04-4,bh04-41a,bh04-a+和bh04-1f)。以41株弧菌为蛭弧菌的宿主菌,本文研究了蛭弧菌对海产品中常见弧菌的裂解消除能力,以探索其对由弧菌所引起的食物中毒等流行性传染疾病的预防效果。实验结果表明,41株弧菌中共有36菌株可被4株蛭弧菌(bh04-4,bh04-41a,bh04-a+和bh04-1f)中的任一株所裂解,占总试验菌株的87.8%;对副溶血弧菌、非01非0139群霍乱弧菌、溶藻胶弧菌这三种常见致病弧菌的裂解率分别达88.9%、83.3%、81.8%。本研究结果揭示了蛭弧菌作为生物消除剂在由弧菌所引起的食物中毒等流行性传染疾病的防治方面有潜在应用价值。
Tolerance of Arundo donax to heavy metals
芦竹对不同重金属耐性的研究

HAN Zhiping,HU Zhenghai,

应用生态学报 , 2005,
Abstract: This paper studied the tolerance of Arundo donax grown in a simulated heavy metals polluted wetland, and determined the biological characters and chlorophyll contents of the plant at its different growth stages as well as the changes of soil heavy metals contents. The results showed that Arundo donax could survive in the wetland when the concentrations of Cu2+, Pb2+, Cd2+, Zn2+, Ni2+ and Hg2+ were 100 mg x kg(-1) and Cr6+ concentration was 50 mg x kg(-1). During 40 days growth period, the chlorophyll content decreased by 20%-56% and the leaf became soft with its tip withered, but the plant still grew. Compared with control, Arundo donax in the polluted wetland was slight and yellow-green, but the impact on plant height was inconspicuous. Arundo donax treated with 100 mg x kg(-1) Cr6+ grew slowly with its root stock rotted, and its leaves withered in a short time, indicating that the plant could not tolerate the pollution of high concentration Cr6+. The concentrations of soil heavy metals declined with the growth of the plant, probably due to the translocation of heavy metals from peripheral soil to rhizosphere and the phytoextraction and phytovolatilization, because the heavy metals contents in rhizosphere were much higher than those in the bulk soil in the test jar. The characters of large biomass, exuberant root and good adaptability of Arundo donax suggested its great potential in remediation of polluted soils. The study on the application of Arundo donax to phytoremediation is of realistic significance.
Phytoremediation of mercury and cadmium polluted wetland by Arundo donax
芦竹修复镉汞污染湿地的研究

HAN Zhiping,HU Xiaobin,HU Zhenghai,

应用生态学报 , 2005,
Abstract: With a pot culture of simulated mercury (Hg) and cadmium (Cd)-polluted wetland, this paper studied the capability of Arundo donax in accumulating these heavy metals, and their distribution in the plant. The results showed that after grown in a 101 mg.kg(-1) Hg-polluted wetland for 8 months, the Hg-concentrating capability of Arundo donax was in order of root > stem > leaf, and the Hg concentration in its aboveground parts was 200 +/- 20 mg.kg(-1) (DW); while in the case of 115 mg.kg(-1) Cd-pollution, the Cd-concentrating capability was in order of leaf > root > stem, and the Cd concentration in leaf was 160 +/- 26 mg.kg(-1) (DW). The heavy metals concentration in Arundo donax organs increased with its growth time, being 30%-50% higher for 8 months than for 4 months. The BCF (Bio-concentration factor) decreased with increasing heavy metals concentration. In polluted wetland, the BCFs of Hg by the leaf and stem were 1.9 and 2.1, and those of Cd were 1.5 and 0.3, respectively; while in unpolluted wetland, the concentration of Hg and Cd was 6.8 and 8.5 mg.kg(-1), the BCFs of Hg by the leaf and stem were 6.8 and 12.2, and those of Cd were 7.0 and 2.7, respectively. It was indicated that Arundo donax not only had the characters of large biomass, exuberant root, and good adaptability, but also exhibited high tolerance and concentrating capability to Cd and Hg.
微波消解逐时络合光度法快速测定聚合铝溶液中的总铝含量
王趁义,,胡晓斌
环境科学学报 , 2005,
Abstract: 聚合铝中的3种铝形态及其总铝含量的传统测定方法分别为Al-Ferron逐时络合光度法和EDTA络合滴定法.这2种方法各自存在着许多不足之处.将微波消解技术应用于逐时络合比色法以便快速测定聚合铝溶液中的总铝含量.研究表明:(1)Ferron混合显色液配制好后存放与否对测定结果的影响很大,用微波辐射处理Ferron混合显色液30s后即可使用,克服了传统光度法中必须存放5d的缺点;(2)微波消解极大地缩短了聚合铝与Ferron之间的解聚/络合反应时间,聚合铝显色溶液微波消解2min即可方便地定量测定铝盐水处理剂中的总铝含量,克服了传统络合滴定法的不足和烦琐.同时用改进的Al-Ferron逐时络合比色法验证了这种总铝测定方法的可行性.
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