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Search Results: 1 - 10 of 198687 matches for " 赵晓宁 "
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水滴撞击固体界面问题的Level Set数值模拟
Level Set Method for Numerical Simulation of Droplets Impacting on Solid Interface
 [PDF]

, 徐爽, 王春武,
Modern Physics (MP) , 2011, DOI: 10.12677/mp.2011.12007
Abstract: Level Set界面追踪方法对于大变形及复杂拓扑结构变化的多相流问题具有一定的优势。本文利用RGFM(Riemann Ghost Fluid Method)定义界面边界条件,然后求解可压缩欧拉方程,用五阶WENO格式推进Level Set函数从而更准确的捕捉界面,处理界面两边密度比为1000的水气多相流运动问题,通过模拟两个不同形状的水滴与平板撞击后的形态变化及其运动过程,并计算运动过程中的水滴损失率,验证方法的准确性,进而了解水滴撞击特性,为研究飞行器部件表面结冰数值模拟提供技术积累。
Level Set method show advantage of dealing with multiphase flows where interfaces can make large deformation and complex topological change. In this paper, we first use the Riemann ghost fluid method (RGFM) advanced by Wang et al. to define the boundary conditions and then solve the compressible Euler equations, using 5th WENO scheme to update level set function which can capture interface more accurately. Based on the current scheme we can easily simulate the multiphase flows which have density ratio of 1000 between two fluids, such as water and gas .In this work, we simulate the movement and topological changes of two droplets which are different in shape when they impact and splash on the solid interface. At the same time we compute the lost ratio of droplet to validate the accuracy of accurate algorithm. Based on the obtained numerical results, we can get the trajectory of droplets. It is helpful to accurately simulate the procedure of icing on the surface of aircraft.
水环境中染料光降解的研究进展
Research Progress on Photodegradation of Dyes in Aqueous Solution
 [PDF]

邓丽君,, , 张锦,
Advances in Environmental Protection (AEP) , 2016, DOI: 10.12677/AEP.2016.66014
Abstract:
对水环境中染料光降解的基础、染料分子的直接光降解和间接光降解进行了综述。重点介绍了染料在Fe(III)体系、腐殖酸体系、NO3- 体系、光催化体系(以TiO2为例)中的光降解。
Photolysis bases of dyes, the direct and indirect photodegradation of dyes in aqueous solution were reviewed. Photodegradation of dyes in solution containing Fe(III), humic acid, NO3- , and catalyst (e.g. TiO2) were summarized.
多功能含能结构材料研究进展
张先锋,
含能材料 , 2009, DOI: 10.3969/j.issn.1006-9941.2009.06.021
Abstract: 多功能含能结构材料是化学能和动能综合利用的用于提高战斗部毁伤效能的新型功能材料。本研究着重介绍了多功能含能结构材料及其应用的国内外研究现状。对多功能含能结构材料作用特性的实验测试方法、作用机理和理论模型进行了简要的评述;阐述了冲击诱发化学反应(shockinducedchemicalreactions,SICR)方法理论基础和数值仿真方法,并对多功能含能材料的应用现状和前景进行了展望,并给出了近期开展工作的建议。
夹层装药的超压爆轰研究综述
张先锋,
含能材料 , 2011, DOI: 10.3969/j.issn.1006-9941.2011.03.024
Abstract: 长期以来炸药爆轰机理得到了世界各国研究学者的关注,炸药爆轰过程中的一些特殊现象得到了重点研究,其中夹层装药的超压爆轰现象已成为研究热点之一。本文着重介绍了夹层装药的超压爆轰现象的国内外研究现状及其应用前景,主要从超压爆轰现象、理论模型、数值仿真、试验观测方法及其在聚能装药、爆炸压实的应用等几个方面进行综述。重点阐述了炸药超压爆轰过程的理论模型,并对超压爆轰作用过程的研究方法及应用进行了深入探讨与分析,并给出了进一步开展夹层装药超压爆轰试验测试、理论模型研究工作的建议。
反应金属冲击反应过程的理论分析
张先锋,,乔良
爆炸与冲击 , 2010, DOI: 10.11883/1001-1455(2010)02-0145-07
Abstract: ?基于1维冲击波理论和粉末材料的冲击温度计算模型对反应金属的冲击响应行为、冲击温度及冲击反应过程进行了理论分析,分别考虑了材料密实度、冲击速度对冲击压力、冲击温度的影响;结合粉末材料冲击温度计算结果及冲击反应的化学动力学方法,提出了考虑反应效率的反应金属冲击反应理论模型。利用新模型得到的计算结果与已有实验结果吻合较好。反应金属的冲击反应行为受密实度、冲击速度及材料种类影响明显。更多还原
辽宁东部山区土壤污染状况与防治对策研究
刘绮,,
应用生态学报 , 1998,
Abstract: 采用灰色聚类法与综合污染指数法对辽宁省东部山区3个县区土壤污染现状进行了调查和评价.结果表明,岫岩县土壤主要污染物是mg、b、pb和as.宽甸县土壤重金属主要污染物是b、mg和pb等;而凤城市境内除发现较为严重的ph、mg污染,凤城镇的hg污染也达到重度污染水平。系统分析了当地土壤污染的主要污染物类型及其原因.提出了mg、b的污染防治对策.
多介质碰撞问题的界面追踪法
王国陈,,
北京理工大学学报 , 2010,
Abstract: 针对多介质流体界面碰撞问题,研究多介质界面的界面追踪方法.基于现有的界面追踪软件FronTier,修改了部分模块和源代码,弥补了现有软件的不足,使之能够处理多介质碰撞问题的复杂拓扑结构.数值模拟结果表明,多介质碰撞问题的数值模拟结果与理论分析结论一致.
冻融循环作用后变形钢筋与混凝土粘结性能退化研究
,,宋玉普
工业建筑 , 2010, DOI: 10.13204/j.gyjz201001022
Abstract: 冻融循环作用后,混凝土内部发生损伤,混凝土的质量损失增加,超声波速、抗压强度和劈裂抗拉强度下降;而随着冻融循环作用次数的增加,钢筋与混凝土的粘结强度下降,钢筋自由端的峰值滑移量则增大;通过对3种直径螺纹钢筋与混凝土冻融后的粘结性能的试验研究得出冻融循环作用后钢筋与混凝土粘结性能下降,特别是极限粘结强度随着冻融循环作用次数增加而下降,根本原因是由于冻融作用损伤混凝土造成混凝土的强度下降所致。
外源水杨酸对2个杜鹃花品种抗旱性的影响
Effects of Exogenous Salicylic Acid on Drought-resistance of Two Rhododendron Cultivars

,梁雯,
- , 2018, DOI: 10.3969/j.issn.1001-7461.2018.03.20
Abstract: 选择2个抗旱性较差的杜鹃花品种‘蓝茵’(Rhododendron‘Lan Yin’)和‘宁波红’(Rhododendron‘Ningbo Hong’)为试验材料,在不同浓度的水杨酸作用下,观察叶片形态并测定各项生理指标,判断其对杜鹃花抗旱性的影响。结果表明,施用不同浓度水杨酸后,‘宁波红’在水杨酸浓度为0.3、0.5 mmol?L-1受旱害较轻,‘蓝茵’在水杨酸浓度为0.3、0.5 mmol?L-1及0.7 mmol?L-1受旱害较轻。适当浓度的水杨酸能提高杜鹃花叶片的总含水量、自由水含量和束缚水含量,保持较低的自由水/束缚水,能促进其叶绿素的合成,提高细胞内的可溶性糖、可溶性蛋白和脯氨酸等细胞渗透调节物质的浓度,防止细胞膜受损,抑制过氧化氢及丙二醛的积累,保护超氧化物歧化酶、过氧化物酶活性,从而减轻干旱胁迫对杜鹃花的伤害,提高杜鹃花的抗旱性。
Two Rhododendron cultivars which had poor drought resistance: Rh.‘Lan Yin’ and Rh.‘Ningbo Hong’ were selected as test materials.Based on the observation of the external morphology and the determination of physiological indexes,effects of exogenous ealicylic acid on drought-resistance of Rhododendron were evaluated.The results showed that after applying different concentrations of salicylic acid,degree of drought damage decreased in Rh.‘Ningbo Hong’ with the concentrations of 0.3,0.5 mmol?L-1 and Rh.‘Lan Yin’ with 0.3,0.5 and 0.7 mmol?L-1.The suitable concentrations of salicylic acid could improve free water content,leaf bound water content and total water content of Rhododendron,keep lower free water/bound water,promote the syntheses of chlorophyll,increase soluble sugar,soluble protein and proline in cells such as cell infiltration through concentration regulating substances,prevent the membrane damage and the accumulation of MDA and H2O2,and protect the activity of SOD and POD.Therefore,it can reduce damage caused by drought stress and improve the drought resistance of Rhododendron
光照强度对微绿球藻生长及有机质积累的影响
Effect of Light Intensity on Growth Rate and Accumulation of Organics of Nannochloropsis oculata Droop
 [PDF]

,, 孙东红, 常林,
Bioprocess (BP) , 2011, DOI: 10.12677/bp.2011.12005
Abstract: 本文以微绿球藻(Nannochloropsis oculata Droop)为材料,在室内研究了光照强度对藻细胞生长及细胞内几种有机物质含量的影响。结果表明,在1000 lx~10,000 lx的光强范围内,比生长速率、可溶性蛋白、类胡萝卜素的含量随光照强度的增加而增加,在5000 lx时达到最高,最高值分别为0.101、3.8%、0.8%,在10,000 lx时反而降低;最高细胞密度随光照强度的增强而增大,10,000 lx时达到最高,为6.52 × 107 mL–1;多糖、总脂含量随光照强度的增加而增加,在2000 lx时达到最高,最高值分别为3.17%、36.95%,在10,000 lx时又降低;叶绿素的含量随光照强度的增强而减小,1000 lx时最高,为0.35%。
Influence of light intensities on growth rate and organics contents of Nannochloropsis oculata was studied. The results showed that the light intensity within 1000 lx and 10,000 lx, the specific growth rate, so-luble protein, and carotenoids contents increased at first and reached the maximum under 5000 lx, then de-creaded under 10,000 lx, the maximums are 0.101, 3.8% and 0.8%. The maximal cell density increased with the increase of light intensity, the maximum is 6.52 × 107 mL–1. Polysaccharide and lipid contents increased and reached the maximum under 2000 lx, then decreased with the increase of light intensity, the maximums are 3.17% and 36.95%. Chlorophyll content decreased with increase of light intensity, the maximum is 0.35%.
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