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Search Results: 1 - 10 of 157072 matches for " 孙军勇 "
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沥青混合料路面离析原因研究
,
公路交通科技 , 2007,
Abstract: 基于沥青混合料均匀性指标,结合现场资料,对沥青混合料路面在施工过程中产生离析的部分原因,如集料堆放、摊铺机选择、混合料运输等展开定量的研究。研究结果表明集料堆放的不当、摊铺机选择的不当以及混合料的运输过程等都会对沥青混合料路面均匀性产生影响,造成路面的离析。对此,提出了相应的预防对策,即集料堆放在平整、坚硬的场地上,避免相互混杂和雨水的流入;应先择半幅摊铺机;尽可能减少沥青混合料的运输距离。
沥青混合料均匀性与性能变异性的关系
,
中国公路学报 , 2006,
Abstract: ?为了研究沥青混合料均匀性与性能间的相互关系,基于数字图像处理技术,通过沥青混合料均匀性指标,利用回归方法对沥青混合料均匀性与空隙率、动稳定度及力学强度间的相互关系进行了定量研究。研究结果显示:沥青混合料均匀性与性能的变异性之间存在相关性;均匀性较差的沥青混合料,其性能的变异程度较大;均匀性较好的沥青混合料,其性能的变异程度稍小;表明控制沥青混合料组成结构的均匀性对控制性能变异性有重要意义。
集料水平向分布状态对沥青混合料劈裂试验影响数值模拟
,
吉林大学学报(工学版) , 2013,
Abstract: 为研究集料水平向分布状态对沥青混合料劈裂试验的影响,基于沥青混合料集料均匀性指标,通过在混合料水平截面不同方向上加载,采用有限元法数值模拟集料水平向分布状态对沥青混合料劈裂试验中最大应力值(平面主应力和水平拉应力)的影响,并加以试验验证。研究结果表明:集料水平向分布状态对沥青混合料劈裂试验中平均最大应力值影响不大,其间相关性不明显,但与最大应力值变异性间相关性却很显著。
氨基噻唑类化合物的合成研究进展有机化学
王冬梅, , 商永嘉
有机化学 , 2011,
Abstract: 氨基噻唑化合物是重要的N-杂环化合物,近年来被广泛应用于工业生产、药物研发等多个领域,因此氨基噻唑类化合物的合成受到了越来越多的关注.对氨基噻唑类化合物的新型催化体系及新型方法进行了综述.
面向云计算的键值型分布式存储系统研究
,林菲,王宝
电子学报 , 2013, DOI: 10.3969/j.issn.0372-2112.2013.07.025
Abstract: 对于数据密集型的云计算应用,基于磁盘的存储系统很难同时满足它们对性能与可用性的需求.本文提出了一种以内存为主设备、以磁盘为辅助设备的键值型分布式存储系统M-Cloud,能提供大数据读写、备份及恢复等存储服务功能.M-Cloud通过将数据全部装入服务器集群内存中的方式提高系统整体性能,并设计了分区线性哈希算法以实现负载均衡和高扩展性,设计了相应的数据备份与故障快速恢复策略以保证系统可靠性.仿真实验结果表明,M-Cloud具有较高的性能与可用性,对系统进一步改进和优化后具有应用于实际生产环境中的潜力,可为用户提供高质量的存储服务.
乘窗信号谱分解及其数据修复
,丁群,
电子学报 , 2005,
Abstract: 针对图像信号缺损问题提出一种新的修复方法,用乘窗函数描述信号缺损,将数据修复转化为频域反卷积运算,使问题得以简化和规范化.由于任何形状缺损的位置均可转变成窗函数统一描述,因此算法可用于修复任意形状的斑块缺损.文中结合实例讨论了缺损形状大小和缺失量对修复效果的影响,同时指出算法在边界处有一定的自动衔接功能.
裸露尤“物”:性客体化影响社会认知的眼动证据
青青,郑丽,
- , 2015,
Abstract: 摘要: 客体化理论认为,对女性身体的关注会导致对能力、热情和道德等社会属性评价的降低,然而以往研究缺乏直接证据。本研究以50名大学生为被试,采用眼动仪考察了对泳装图片和非泳装图片人物聪明程度评价过程中的眼动特征,结果发现:相比非泳装图片,被试对泳装图片人物的聪明程度评分更低;相比非泳装图片,被试对泳装图片人物胸部的注视点更多,注视时间和首次注视时间更长,对面孔的注视时间和首次注视时间更短。眼动特征表明,对泳装图片社会感知过程中存在客体化注视,直接且直观地支持了客体化理论。
Abstract: Sexual objectification occurs when a woman’s body, body parts, or sexual functions are separated from her entire person, thus reducing her status to that of a mere instrument, as if this was capable of representing an entire person. Numerous studies have demonstrated that sexual objectification affects the perceptions of others, and this is related to both diminished perceptions of mind and dehumanization. Objectification theory holds that when people are sexually objectified, they are perceived as mere objects that lack the mental states. However, there is no direct evidence showing that diminished social perceptions are affected by sexual objectification. Moreover, previous studies have been primarily conducted with samples of white women. Very few have explored non-Western samples. Therefore, in this study, we aim to examine the effect of sexual objectification on perceptions of intelligence and to explore the existence of sexual objectification in the process of perceptions via eye tracking of Chinese college students. A total of 50 (25 women, 25 men) undergraduates, aged18-24, took part in the study. A 2 (picture type: objectified, non-objectified) × 2 (target gender: male, female) × 2 (participant gender: male, female) mixed model design was utilized. Consistent with previous research, in each objectified photograph, the target wore either a swimsuit or underwear. In each non-objectified photo, the target was fully clothed in a long sleeved t-shirt and dark pants. All images were of people of Chinese nationality, who stood and faced the camera with neutral facial expressions. The participants then rated the intelligence of the person portrayed in each picture. Eye movements were recorded while participants individually viewed and rated the picture with an Eyelink 1000 eye tracker. The results showed that both objectified women and men were attributed with less intelligence than non-objectified targets, which is consistent with previous findings suggesting that sexual objectification is related to diminished perceptions of mental capacity and increased dehumanization. Eye movement tracking showed that the fixation count on chests of objectified targets was significantly higher than on objectified targets. The dwell time and first fixation duration for the faces of objectified targets were both
葫芦[7]脲对孔雀石绿的包结作用及应用
Inclusion Complex of Malachite Green with Cucurbit[7]uril and Detection of Malachite Green using Cucurbit[7]uril
 [PDF]

唐冬宝, , 武凯, 李涛, 周运友
Advances in Analytical Chemistry (AAC) , 2012, DOI: 10.12677/aac.2012.22002
Abstract: 利用荧光光谱滴定法研究孔雀石绿和葫芦[7]脲的包结作用,在一定的浓度范围内,我们发现孔雀石绿的荧光强度随着葫芦[7]脲的浓度的增加而增加,同时,最大发射峰的位置发生了一定程度的红移。我们利用了紫外–可见吸收光谱、荧光光谱、IR、1H NMR和量子化学计算等方法研究了水溶液中孔雀石绿与葫芦[7]脲之间的包结行为,探讨了MG-CB[7]的包结机理。相关的结果表明孔雀石绿与葫芦[7]之间形成1:1的包结络合物。该方法的检出限是4.2 × 10–8 mol·L–1。
The interaction between malachite green (MG) and cucurbit[7]uril (CB7) had been studied based on fluores-cence and 1H NMR spectroscopic results. The interaction mechanism was also discussed concretely based on 1H NMR results. The fluorescence intensity of malachite green (MG) enhanced strongly and a slight red shift was observed at the maximum emission peak when added into cucurbit[7]uril. We had found that the formation of the complex at a 1:1 complex stoichiometry and the association constant was calculated by applying a deduced equation. The thermody-namic parameters such as ΔH and ΔS values were obtained according to Van’t Hoff equation, respectively. We prepared the solid inclusion complex from co-evaporation method and characterised it by 1H NMR、IR. For the efficient detection of malachite green, the limit of detection was 4.2 × 10–8 mol·L–1 from our experiments which will make our method applied to detect the malachite green in sewage effectively.
青海东北部木里煤田控煤构造样式与找煤预测
曹代,红波,
地质通报 , 2010,
Abstract: 在系统分析木里煤田构造格局和构造控煤特征的基础上,将本区控煤构造样式划分为压缩、剪切、滑动3大类和8种类型。揭示了控煤构造样式与煤系赋存之间的关系,木里煤田控煤构造样式以压缩为主,分布广泛,部分矿区构造样式表现为剪切和层滑,各矿区煤系赋存状态受煤田构造格局的控制,具有南北分带、东西分段的特征。煤田边缘构造复杂,控煤构造样式以逆冲前锋型、逆冲断夹块型、逆冲-褶皱型和对冲型为主,含煤向斜形态多不完整;煤田中部地质构造相对简单,控煤构造样式以褶皱-断裂型为特征,含煤岩系赋存稳定,是有利的勘查开发区段。
单层厚壁圆筒弹性动应力的简化计算方法
,郑津洋,邓贵德,国有
工程力学 , 2006,
Abstract: 厚壁圆筒在爆炸领域被广泛应用,经典厚壁圆筒弹性动应力公式计算十分复杂,不利于工程直接应用。为了得到有效的精度较高的单层厚壁圆筒弹性动应力的简化计算公式,从经典动应力公式出发,通过求取频率特征方程的特征值,再将其代入动应力公式中进行简化计算,结合对动应力公式的级数表达式的讨论,最后得到了简化的厚壁圆筒内壁和外壁处动应力计算公式。数值计算结果表明,在圆筒外直径和内直径之比K不超过2时,简化计算结果和精确解的相对误差不大于6%。
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