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Search Results: 1 - 10 of 143191 matches for " 杜晓鹏 "
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采用零价铁-缓释碳修复氯代烃污染地下水的中试研究
李书,,,
环境工程 , 2013, DOI: 10.13205/j.hjgc.201304014
Abstract: 针对受氯代烃污染的地下含水层,采用零价铁-缓释碳技术进行修复中试研究。中试期间,向地下9~18m受氯代烃污染的含水层(体积900m3)注入7200kg零价铁-缓释碳药剂。对地下水中污染物进行定期监测,结果显示零价铁-缓释碳技术可以高效地将地下含水层中的氯代烃污染物脱氯降解。其中1,2-二氯乙烷的去除率达99.90%以上,1,1-二氯乙烷的去除率达86.00%以上,氯仿的去除率达98.00%以上。在零价铁-缓释碳还原体系存在的条件下,1,2-二氯乙烷、1,1-二氯乙烷和氯仿三种污染物的半衰期分别为46,115,70d。研究证明零价铁-缓释碳技术可以高效地修复被氯代烃污染的地下含水层,并且修复期较短,对氯代烃类污染场地地下水的修复有重要的实用价值。
基于栅格距离变换的扩展对象空间聚类方法
耿协,,
测绘学报 , 2009,
Abstract: 空间聚类是空间分析和空间数据挖掘的重要方法和研究内容。在地图代数中,通过建立栅格坐标与距离平方对应的栅格平方平面!计算栅格空间的最短距离,实现栅格距离变换。以栅格空间距离变换为基础,通过提取特征等距线,揭示简单的空间点集聚类过程,并将这种算法扩展到点$线$面实体混合分布空间!以及加权距离以及障碍空间的空间聚类,算法分析表明该算法简单、合理。
带复杂外形附体的AUV流体动力数值计算
,宁腾飞,,
兵工学报 , 2013, DOI: 10.3969/j.issn.1000-1093.2013.02.015
Abstract: ?自主式水下航行器(AUV)携带复杂外形附体(设备)时,其流体动力参数的精确计算是一个技术难点。利用通用流体动力学仿真软件CFX,采用SST湍流模型,对带有盐温深传感器(CTD)和GPS/北斗天线的AUV流体动力进行了数值计算,得到了3种模型下AUV流体动力的变化规律,分析了不同附体对AUV流体动力的影响。结果表明,带有附体后AUV水平面不对称,在附体处压力及速度变化剧烈,导致AUV流体动力参数及流场有了很大的变化。数值计算结果为AUV工程设计提供了参考依据。
青藏高原高寒草甸组分种花期物候对施肥响应
巴雅尔塔,,,国祯
草业学报 , 2010,
Abstract: 青藏高原东部高寒草甸封育和施肥生境中18个植物物种物候对施肥的响应结果表明,施肥导致双子叶植物(不含豆科)的始花期、开花峰值期和终花期轻度提前或者轻度推迟,花期持续时间轻度延长或者缩短;豆科植物的始花期轻度推迟,开花峰值期和终花期与对照无差异,花期持续时间轻度缩短;施肥未能够显著改变双子叶组分种的花期物候。施肥导致禾本科物种的始花期、开花峰值期、终花期显著推迟,花期持续时间轻度延长或者缩短。对照(封育)群落组分种种间开花峰值期为集中分布,科内开花峰值期为随机分布;施肥处理下群落组分种间开花峰值期为集中分布,双子叶组分种科内开花峰值期为随机分布,禾本科组分种科内开花峰值期为集中分布;施肥改变了施肥生境中禾本科组分种的花期分布模式。高寒草甸群落组分种花期物候对施肥响应存在差异。
基于遗传算法和神经网络的泵站经济运行研究
鄢碧,,刘超,成立
农业机械学报 , 2007,
Abstract: 以泵站总耗能最小为目标,建立了叶片可调节泵站站间和站内经济运行优化数学模型,采用遗传算法应用Matlab语言实现优化计算。对江都第4站1999年实际运行资料进行优化计算,总消耗功率比经验操作可减小3.39%左右。针对泵站的流量和扬程变化频繁而一般的优化计算方法速度较慢的问题,以仿真优化结果为样本,利用人工神经网络对相似工况进行预测,预测结果平均误差为1.99%。遗传算法和神经网络联合应用,求解精度和可靠性较高,是解决泵站优化运行问题的有效方法。
名字易识认性对被信任者的可信性的影响
辛志勇,,沙璐
- , 2015,
Abstract: 摘要: 从名字可以联想个体的社会身份和生理心理特征。现有研究多从名字寓意角度考察名字的影响。但从加工流畅性角度,名字本身有一个最直观分类:容易识认和难以识认。名字易识认性就可能会对被信任者的可信性产生影响。本研究共有四个被试内实验。前两个实验以编制的名字为实验材料,分别通过让被试判断被信任者的安全性和信任博弈两个范式证明名字易识认性强的个体的可信度更高。后两个实验则选取真实名字为启动材料再次证明了该结论。
Abstract: Researchers explain the effect of Chinese names now more from the perspective that names activate semantic information. But judgment reflects not only content but also the metacognitive experience of processing the content. Recoginzability can influence the processing fluency, an important cue of metagognitive experience. The recognizability of a name here depends on the using frequency of the characters included in the name. Names with more rarely used Chinese characters are more difficult to recognize. We demonstrate that this processing difficulty makes people with hard to recognized names to be thought less credible. And the effect exists when the names’ attractiveness of literal meaning and implied meaning are both controlled. To explore whether regognizability will influence people’s judgment on trustee’s trustworthiness, we combined 60 Chinese names without first names. 30 names are difficult to recognize and the other 30 easy to recognize. Each name contains 2 characters. The 120 characters were all collected according to Chinese national standard GB2312–80. 60 characters used to combine the easy-to-recognize names were randomly collected from areas 16-55 in GB2312–80 and characters used to combine the difficult-to-recognize names from areas 56-87.Characters from areas 16-55 are the most frequently used Chinese characters and characters from areas 56-87 are less but not the least frequently used Chinese characters. Then we created a questionnaire comprised of a random and mix of all the 60 names and asked 28 participants to “please rate the ease with which these names of people can be recognized’’ on a scale where 1 =very difficult and 7 =very easy.” Finally 5 names with the highest scores and 5 names with the lowest scores were chosen as the materials used in the next studies. We call names with the highest scores the easy names and names with the lowest names the difficult names hereafter. To make the manipulation check, we analyzed participants’ recognizability ratings using ANOVA, which revealed that easy names were rated as significantly easier to recognize. Then we asked another 31 participants to rate the attractiveness of both the literal meaning and implied meaning of the 10 names. ANOVA results showed that there were no significantly differences between the 2 groups on the attractiveness of both the literal meaning
光条件对人工培养蛹虫草子座产量及虫草素和腺苷的影响
Effect of Light Conditions on Growth of Cordyceps militaris and Mass Fraction of Cordycepin and Adenosine

简利茹,,双田
- , 2015, DOI: 10.7606/j.issn.1004-1389.2015.04.026
Abstract: 以蛹虫草菌株CM-16为研究对象,小麦为主要栽培基质,研究不同的光条件对蛹虫草的子座产量及虫草素和腺苷的影响。结果表明,当光照度为150 lx时,子座产量及2种有效成分质量分数均较高,此时子座产量(以干质量计)达到每盒52.66 g,虫草素和腺苷的质量分数分别为4.56 mg/g和2.11 mg/g;光照时间为8 h/d 时,子座产量及虫草素质量分数较高,此时子座产量达到每盒54.30 g,虫草素质量分数为4.41 mg/g,光照时间对腺苷的积累影响不大;蓝光有利于蛹虫草生长和子座积累虫草素,但其他光质对子座中的腺苷的作用没有太大差异。
Growth of Cordyceps militaris CM-16 and changes of two active ingredients (cordycepin and adenosine) were studied in wheat medium under different light conditions. The results showed that when illumination intensity was 150 lx, the production of stroma, cordycepin and adenosine reached to the maximum, 52.66 g/box, 4.56 mg/g and 2.11 mg/g respectively. When illumination time was 8 h/d, the production of stroma and content of cordycepin were the highest, 54.30 g/box and 4.41 mg/g respectively. But illumination time had less effect on the accumulation of adenosine in stroma. Blue light were benefit for the growth of Cordyceps militaris and cordycepin accumulation, however, Blue light had no significant difference on the content of adenosine compared with other light wave.
欧李八氢番茄红素合成酶cdna克隆、序列分析及在大肠杆菌中的功能表达
张建成,王鹏飞,俊杰,刘和,,
园艺学报 , 2011,
Abstract:
树状分子胺催化的Henry反应研究有机化学
易兵, 张阳,, 杨艳, 文乐, 刘展
有机化学 , 2011,
Abstract: Henry反应是一类重要的构筑碳碳键的原子经济型反应,生成的双官能团化合物β-硝基醇是一种应用很广的有机合成中间体.以苯甲醛与硝基甲烷的Henry反应为模型,首先尝试了一些小分子弱碱催化剂的催化效果.在此基础上,合成了0~2代聚苯醚型树状分子哌啶催化剂,并进行了1HNMR,IR和MS表征,将其应用于Henry反应,对其催化性能进行了初步研究,结果表明:低代数树状分子哌啶在硝基甲烷中的催化效果较好,高代数树状分子哌啶表现出负的树状分子效应.
江苏省交通运输业能源消费碳排放及脱钩效应
杨良杰,吴威,苏勤,,
长江流域资源与环境 , 2014, DOI: 10.11870/cjlyzyyhj201410007
Abstract: 通过自上而下的计算方法,测算了江苏省1995~2010年交通运输行业能源消费碳排放量和人均碳排放量,并结合行业自身发展特点,扩展了Kaya恒等式,运用LMDI分解法进行分解分析。同时,在上述基础上采用Tapio模型对江苏省交通碳排放与交通运输业经济发展的脱钩关系进行了探讨。研究发现:(1)江苏省交通碳排放量与人均碳排量均呈明显上升趋势,其中石油制品类能源消费碳排放表现突出;(2)正向驱动交通碳排放量增加的因素为经济产出、人口规模和产业结构,负向驱动因素为交通能源结构和交通能源强度。其中,拉动碳排放量增长的决定性因素是经济产出规模的扩大,而促使碳排放减少的主要因素是交通能源强度的降低,相对于正向驱动因素,负向驱动因素抑制交通碳排放增加作用有限;(3)交通碳排放量变化与运输业经济发展之间的脱钩状态以扩张负连接、扩张负脱钩和弱脱钩为主,脱钩关系总体呈先恶化后改善的趋势,但要完全实现两者的绝对脱钩,依然任重道远
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