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Search Results: 1 - 10 of 108434 matches for " 马建 "
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冬小麦非充分灌溉不同水分处理下需水量分析
Water Needs Analysis of Deficit Irrigation for Winter-Wheat Under Different Moisture Treatments
 [PDF]

, 李明
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.14041
Abstract: 针对灌溉中作物实时需水量分析研究中存在的问题,本文进行了实验方案设计,利用土壤水环境测定系统EnviroScan进行了土壤水分测定,自动气象站AWS对气象条件进行观测,利用监测的实时数据资料,研究了非充分灌溉条件下冬小麦不同水分处理时的灌水情况,对生育期总需水量、生育期逐日需水量变化趋势和各生育阶段的需水量及需水模系数进行了分析,实验的三组处理灌水情况与需水量情况都与试验区气候和冬小麦自身生长规律相符合,可为冬小麦的节水高产和制定经济合理的实时灌溉制度提供理论依据。
Aimed at the problem of water needs in crop’s real-time irrigation, the experiment scheme is designed in the paper, the soil moisture is monitored via the technical soil-water environment monitoring system-EnviroScan, the weather data is measured by the automatic weather station (AWS). Based on those real- time measured data, the different irrigation simulation under different experiment deal is studied for deficit irrigation, the water needs of the whole growth stage, the trend of daily water needs, water needs coefficients of each growth period are all analyzed in the paper, which could provide theoretical basis and decision sup- port for reasonable real-time irrigation for winter-wheat. The results showed that the irrigation simulations and the real water needs rule for the three experimental water deals were according with the real weather and the growth of winter wheat.
部分碳系材料的拉曼光谱研究
Study on Raman Spectra of Some Carbon Materials
 [PDF]

汪峰, 小东, 戴长
Applied Physics (APP) , 2013, DOI: 10.12677/APP.2013.33015
Abstract:

本文利用激光拉曼光谱技术分别研究了植物油,化妆品、汽油机油和柴油机油这四类不同的碳系材料的拉曼光谱。通过对其拉曼光谱的分析,不仅精确测定了其拉曼位移的数值,还提高了对拉曼散射效应的认识。结合所测的多种碳系材料的光谱结果,讨论了其拉曼活性、相对强度、谱线线宽和分辨率等光谱特性。本文的研究结果不仅丰富了上述四类被测材料的微观信息,还系统认识了它们的光谱识别方法。
Some carbon materials are experimentally studied by using the laser Raman spectroscopy, such as vegetable oil, cosmetics, engine oil and diesel engine oil. Based on the analysis of the Raman spectra, not only the Raman shift is obtained accurately, but also the understanding of Raman scattering effect is enhanced. The spectral characteristics of these materials, including the Raman activity, relative intensity, the FWHM line width, and the spectral resolution, are discussed. The investigations not only enrich the microscopic information about the materials measured, but also obtain the relevant method of the spectral identification.

音乐情绪及其神经基础
Musical Emotion and Its Neural Basis
 [PDF]

王璐, 陈旭,
Advances in Psychology (AP) , 2014, DOI: 10.12677/AP.2014.46098
Abstract:
音乐情绪是指音乐诱发的情绪,是音乐价值的集中体现。与日常情绪刺激不同,音乐往往诱发了个体的快乐体验。脑成像的研究表明音乐情绪调节了几乎所有的大脑边缘及旁边缘结构的活动,负责自主神经系统唤醒的下丘脑、脑岛和前扣带回皮层、形成记忆的海马区以及涉及复杂认知活动的前额叶皮层,尤其是眶额叶皮层、伏隔核和杏仁核。此外,包括多巴胺在内的多种神经递质也参与了音乐情绪的加工。这些脑区和神经化学物质与奖赏系统高度重合,为音乐诱发快乐体验提供了神经基础。未来的研究可在实验材料的标准化,影响因素如人格、文化的控制和神经网络交互作用等方面进一步探索。
Musical emotion, refers to music-evoked emotion, and reflects the value of music. Different from daily emotional stimuli, music often induces individual experience of happiness. Functional neuroimaging studies show that musical emotion can modulate activity in virtually all limbic and paralimbic brain structures, hypothalamus, insula, anterior cingulate cortex, hippocampus and prefrontal cortex, especially orbitofrontal cortex, nucleus accumbens and amygdale. Moreover, varieties of neurotransmitters, including dopamine, are involved in the processing of musical emotion. Those regions and neurochemicals are highly overlapped with reward system, which may explain why music induces pleasure. Researches in future can focus on standardization of music materials, and effect factors such as personality, control of culture, and neural interactions between subcortical and cortical regions.
不同趋近动机强度积极情绪对注意瞬脱的影响
The Effect of Low versus High Approach-Motivated Positive Affect on Attentional Blink
 [PDF]

王璐, 陈旭,
Advances in Psychology (AP) , 2014, DOI: 10.12677/AP.2014.47113
Abstract:
注意瞬脱反映了注意资源在时间进程上的有限性。本研究首次探究了不同趋近动机积极情绪对注意瞬脱的影响。实验采用食物和幽默的视频分别诱发高趋近动机积极情绪——渴望和低趋近动机积极情绪——搞笑,以注意瞬脱经典范式为实验任务,以T1正确时T2的正确率为注意瞬脱量指标,结果发现:高低趋近动机积极情绪均降低了注意瞬脱量,且低趋近动机积极情绪较高趋近积极情绪的扩展效应更大(边缘显著),说明积极情绪能够扩展个体的时间注意广度。进一步分析发现,低趋近积极情绪提高了T2在lag4和lag5位置上的正确率,高趋近动机积极情绪提高了T2在lag1和lag2位置上的正确率,暗示了高低趋近动机积极情绪对注意瞬脱的影响可能存在不同的内在机制。文末总结了本研究的不足之处及今后的研究方向。
Attentional blink reflects the limitation of attention resource over time. This is the first study to explore the effect of low versus high approach-motivated positive affect on attentional blink. We used food and humor videos to induce high approach-motivated positive affect (desire) and low approach-motivated positive affect (amusement) separately. Subjects were required to complete classic attentional blink tasks. The performance of attentional blink was indicated by the accuracy of T2 when T1 was correct. Results showed both low and high approach-motivated positive affect improved the performance attetional blink, and this effect was bigger in low approach-motivated positive affect than high. Further analysis revealed that low approach-motivated positive affect improved the accuracy of T2 when T1 was correct on lag4 and lag5, however, high approach-mo- tivated positive affect improved the accuracy of T2 when T1 was correct on lag1 and lag2, which may indicate different mechanisms of effect of low versus high approach-motivation on attentional blink. In the end, we summarized the deficiencies of this research and proposed future directions.
愤怒身段表情的视觉搜索优势
The Visual Search Advantage of Angry Body Posture
 [PDF]

吴昊, 陈旭,
Advances in Psychology (AP) , 2015, DOI: 10.12677/AP.2015.55042
Abstract:
愤怒面孔作为威胁性情绪信息存在视觉搜索优势,被称为“愤怒优势效应”。身段表情是非言语情绪信息的重要来源,与加工面部表情存在类似的行为和神经机制。本研究运用视觉搜索范式,考察真实的身段表情是否能像真实的情绪面孔一样存在愤怒优势效应。结果发现,无论在中性还是情绪性,愤怒身段表情的搜索速度均快于悲伤身段表情;在没有目标的序列中,愤怒身段表情的搜索速度依然比中性和悲伤的搜索速度更快。真实愤怒身段表情存在视觉搜索优势,证明真实身段表情的确是有效的情绪信息来源。
The visual search advantage of angry faces as threatening emotional information is known as “anger superiority effect”. Body posture is an important source of nonverbal emotional information and has a similar behavior and neural mechanisms with facial expressions. The present study uses the visual search paradigm to investigate that whether real body postures have anger superiority effect as real emotional faces. Results confirmed that angry postures are found more quickly than sad postures in crowds of both neutral and emotional distractors; in the target-absent array, the search speed of anger postures is faster than that of neutral and sad postures. There is visual search advantage in the real anger postures, which demonstrates that real body postures are an effective source of emotional information.
手性配体交换色谱法直接拆分DL-氨基酸

色谱 , 1991,
Abstract: 手性配体交换色谱法在多种色谱拆分技术中占有重要地位。首先,手性配体交换色谱法往往具有较大的拆分因子,可进行半微量制备性拆分;其次,该技术可直接拆分氨基酸、羟基酸等极性化合物,不需要柱前衍生化。因此,自1970年Davankov及其同事首次用配体交换色谱拆分DL-脯氨酸以来,该技术受到人们的普遍重视。在七十年代,有关的研究报道几乎占色谱拆
正交异性矩形板非线性的固有热振动
吴晓,
工程力学 , 1999,
Abstract: 采用改进的L-P法及伽辽金原理研究正交异性矩形板非线性的固有热振动,并讨论分析了温度、长宽比等因素对正交异性矩形板非线性固有热振动频率的影响。
以交联聚N-(乙烯基苄基)乙二胺为载体的手性螯合树脂的合成

科学通报 , 1989,
Abstract: 以手性螯合树脂的过渡金属络合物做配体交换色谱的固定相,可直接拆分DL-氨基酸。~~
接有亲水性间隔臂和L-脯氨酸功能基的交联聚苯乙烯树脂的合成

科学通报 , 1989,
Abstract: L-脯氨酸联接于交联聚苯乙烯载体上,合成出手性螯合树脂(Ⅰ),其铜(Ⅱ)络合物做配体交换色谱固定相,拆分了多种DL-氨基酸。但由于聚苯乙烯的强疏水性,致使氨基酸在色谱过程中传质困难,完成一次拆分操作往往需要数小时。我们认为,在L-脯氨酸与该载体之间插入亲水性间隔臂,可增强相应螯合树脂的亲水性,从而提高氨基酸的传质速度,使其保留
主动悬架系统对汽车侧翻稳定性改善分析
余 强,
中国公路学报 , 2005,
Abstract: ?针对被动悬架系统侧翻稳定性比较差的问题,提出采用主动悬架系统的方法进行改善。通过汽车侧倾运动状态分析,建立了被动悬架系统、主动悬架系统和控制系统模型。模拟分析得到主动悬架系统使得汽车在弯道行驶时的侧倾角有效值下降了92.8%,侧倾角加速度有效值下降了78.2%,侧翻因子有效值下降了92.6%。结果表明:利用主动悬架系统可以有效地降低汽车非直线行驶时的侧倾角以及侧倾角加速度,提高汽车的侧翻稳定性,是提高汽车非直线行驶状态下安全性的一个合理的解决方案。
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