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Search Results: 1 - 10 of 22409 matches for " 战淑芸 "
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1949-1987年间埃尔尼诺现象的分析
,
华东政法大学学报 , 1989,
Abstract: 本文利用1949年至今太平洋海温距平场资料对各次埃尔尼诺过程的开始时间、发展过程及强度等方面进行了分析,找出了各次埃尔尼诺的不同特征,并分析展望了于1986年开始的埃尔尼诺过程.
基于相反分类器的数据流分类方法
王勇 李怀 张阳 蒋
计算机科学 , 2006,
Abstract: 目前挖掘概念流动的数据流已经成为研究的热点。概念流动的数据流分类在预防信用卡欺诈,网络入侵发现等应用中具有重要的应用。本文定义了一种相反分类器来从错误中学习,提出了训练一个集合分类器来对具有概念流动的数据流进行分类的算法iwb。通过在合成数据集和benchmark上的实验,与weightedbaggging算法比较,表明我们的算法具有更高的准确度,更快地收敛到新的目标概念的性能。
构建我国纳税信用体系的有关思考
梁俊娇,
中央财经大学学报 , 2006,
Abstract: ?本文针对我国的纳税信用缺失的状况,从历史的角度和制度角度分析,指出我国由于历史原因长期存在信用缺失状况使得纳税信用低下;税制设计方面有违公平原则,存在不利于纳税人诚信纳税的地方,制约了纳税信用体系的建设。然后,由原因入手提出构建纳税信用体系的几点建议:转变对信用的认识,完善税制,健全社会信用等。
地西他滨治疗老年骨髓增生异常综合征1例并文献复习
高雅,平宝红,
南方医科大学学报 , 2012,
Abstract: 摘要:骨髓增生异常综合征(mds)表观遗传学改变和去甲基化药物的问世为其治疗提供了新的方向,用标准剂量地西他滨治疗ipss分期中危ⅱ的老年mds患者1例,第一疗程即达完全缓解,取得较好效果,同时对地西他滨治疗mds的国内外文献进行复习。
红平菇漆酶基因异源表达及对染料脱色的研究
郑苗苗,,张东向,张令昂,
纺织学报 , 2014,
Abstract: 以白腐菌红平菇PleurotusdjamorRNA为模板,通过RT-PCR得到漆酶Pd-lac1基因的完整CDS序列。构建毕赤酵母表达载体pPICZB-Pd-Lac1,并通过电转化法导入Pichiapastoris中,通过PCR结果证明,Pd-lac1的CDS序列部分阳性转化子已经整合到甲醇毕赤酵母染色体上,经摇瓶液体培养后筛选出蛋白表达较高的酵母工程菌株。漆酶活力达54U/L。进而研究了重组漆酶对染料脱色的影响。结果表明:重组漆酶对蒽醌类SN4R脱色可达52.8%;杂环类中性红、偶氮类甲基橙和三苯基甲烷类孔雀绿的脱色率低于SN4R,脱色率分别为14.8%、14.5%、0.24%,显示出重组漆酶对SN4R脱色效率具有较大的应用潜力,从而对废水处理具有更广的应用前景。
Effects of ground coverings on radiant energy distribution in the canopy of Eucommia ulmoides Oliv. coppice forest
地面覆盖对皮叶两用杜仲(Eucommia ulmoides Oliv.)林冠层辐射能分布的影响

,孙丙寅,郭军
生态学报 , 2008,
Abstract: Ground white clover (Trifolium repens Linn.) planting (CM), plastic film mulching (FM), and straw mulching (SM) were applied to an 8-year-old eucommia (Eucommia ulmoides Oliv.) forest to study the effects of these ground coverings on light energy distribution within the forest canopy. The forest none ground mulching (NM) was used as a control. Total radiation in the middle part of the forest canopy decreased by 18.8%, 20.0%, 17.1%, and 17.1% for the treatments of CF, FM, SM, and NM respectively compared with those in the upper part of the forest canopy with the same mulching treatments. There were relatively large differences among the amounts of ground-reflected radiation received by the lower part of the forest canopy with different coverings; the ground-reflected radiation received by the lower part of the forest canopy with CM, FM, and SM increased by 42.8%, 56.4%, and 8.1% respectively, compared with the control. The amounts of ground-reflected radiation received by the middle canopy were markedly lower than those received by the lower part of the forest canopy with these coverings. The net radiant energy in the middle forest canopy with CM, FM, and SM increased by 14.4%, 18.5%, and 5.6% respectively, compared with that in the lower part of the forest canopy without any covering. The net radiation distribution in the forest canopy with different coverings appeared to vary identically, and the net radiant energy values appeared to increase exponentially from the lower part to the upper part of the forest canopy. Our results showed that CM as an agricultural practice in orchards was the best ground cover than other two and had high potentials developed for non-timber forests in the Qinling Mountains.
大连市血液透析中心污染情况监测
孙亚慧,贤梅,
中国公共卫生 , 2006, DOI: 10.11847/zgggws2006-22-01-59
Abstract: ?血液透析是引发经血传播疾病的危险因素之一,也是医院感染的重要途径之一[1].为了解大连市血液透析中心污染情况,本文于2003年2月采取分层抽样方法选定16所设有血液透析中心(2所省级、9所市级、2所区级、3所企事业单位)的医院进行监测.现将结果报告如下.
一类量子比特-垂特态中测量诱导的非经典关联(英文)
,芮品,王胜房
安徽大学学报(自然科学版) , 2014,
Abstract:
CO2浓度对黄瓜叶片光合速率、RubisCO活性及呼吸速率的影响
于国华,张国树,,罗文熹
华北农学报 , 1997, DOI: 10.3321/j.issn:1000-7091.1997.04.021
Abstract: 研究了在200、350、500、700、1000mg/kgCO2浓度处理下的黄瓜叶片的光合速率、呼吸速率及双磷酸核酮糖羧化加氧酶(RubisCO)活性。结果表明,增加CO2浓度,可显着提高黄瓜叶片的光合速率,在强光下,效果尤其明显。黄瓜叶片光合速率对不同CO2浓度的响应都有一个由低到高再低的趋势。黄瓜叶片暗呼吸在短时间内,随CO2浓度的增加而提高,随着时间的延长(6min后),各种CO2浓度下的呼吸速率都降至相似的低水平。此时,CO2浓度不影响暗呼吸速率。空气CO2浓度,细胞间隙CO2浓度与光合速率是一致的,在高CO2浓度下,气孔导度一般不是光合速率的限制因子。黄瓜叶片双磷酸核酮糖羧化酶活性,随CO2浓度的增加而提高,RuBP加氧酶活性降低,RuBP加氧酶与羧化酶之比亦下降。但在CO2浓度超过500mg/kg后,RuBP羧化酶活性增长幅度变小
地面覆盖对皮叶两用杜仲(eucommiaulmoidesoliv.)林冠层辐射能分布的影响
明?,孙丙寅?,郭军*?
生态学报 , 2008,
Abstract: 地面覆盖对皮叶两用杜仲(eucommiaulmoidesoliv.)林冠层辐射能分布的影响
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