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In the present article an attempt is made to elucidate the organic colorants commonly encountered in the Russian avant-garde painting palette by a combined art historical, documentary and physicochemical investigation, and to examine the influence of environmental factors on the chromatic profile originally sought by the artist. The overall approach based on written sources is confirmed by measurements on relevant paintings. The documentary research deals with the influences of Orthodox iconography, folkloric art, and occidental modernist tendencies on the Russian avant-garde palette, and studies the effects of contradictory historical processes in the chromatic profile of individual paintings. In the experimental section a series of colorants are investigated concerning the effects of accelerated ageing on experimental painting tables, prepared as watercolor and gouache layers on paper ground. The resulting samples are subjected to colorimetric and spectroscopic measurements, and analogous analytical procedures are applied on samples taken from selected paintings. A systematic comparative study of all data permits evaluation of the materials used in terms of their stability towards extrinsic factors, and proposal of degradation routes in order to assist museum curators and conservators in every concrete case related to the broad spectrum of pigments examined. 相似文献
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一种进口胶粘剂溶剂的剖析 总被引：1，自引：1，他引：0
采用化学法和FT IR、GC/MS等现代测试技术 ,分析、测定了透明型光学用胶粘剂 (简称光学胶 )溶剂的化学结构为苯乙烯 (C6 H6 CHCH2 ) . 相似文献
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小波变换与生物信号处理 总被引：1，自引：0，他引：1
本从生物医学信号处理的发展历程、现状、以及未来可能的发展方向等几个方面出发对生物医学信号处理的特点、难度、须解决的关键技术以及应用前景进行了探讨。 相似文献
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理光复印机补粉异常原因分析 总被引：1，自引：1，他引：0
舒跃林 《现代图书情报技术》2003,(4):93-95
补粉异常是导致理光复印机复印图像劣化的主要原因。本文结合理光复印机的图像密度检测和补粉情况，分析补粉异常故障的原因，介绍排除故障方法。 相似文献
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介绍了一种基于USB技术的便携式石油测井测试系统的设计,详细阐述了该测试系统的USB接口开发的方法数据通信过程。该系统使用DSP和FPGA的硬件架构,完成了测井数据的获取和格式转换,并利用USB控制芯片FT245BL实现了测井仪器与PC机之间的通信,实验结果表明该测试系统很好的满足了实验室仪器调试的需要。 相似文献
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本文用傅立叶变换红外光谱法研究了人体中各不同器官产生的结石（尿结石、胆结石）的成份。结果表明：傅立叶变换红外光谱法可方便地确认出人体结石中的羟磷灰石（尿结石）和胆红素钙、胆固醇及胆酸类物质（胆结石）。 相似文献
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EMG Changes of Biceps Femoris Muscle during Contraction with Different Loads and at different Speeds
The study made an observation of electromyograph changes of biceps femoris muscle during contraction with different loads and at different speeds. The results indicated: the IEMG during fast contraction (one elbow flexion each second) and slow contraction (one elbow flexion every two seconds) with three loads (5kg, 10kg, 15kg) didnot show significant difference whether be fore or after fatiguel the MPF of fast contraction be fore fatigue was larger than that of slow contraction: the IEMG during dynamic contraction to fatigue (5kg, 10kg) was significantly larger than that before fatigue; with the loading of 15kg the IEMG after fatigue significantly decreased;the MPF decreased during contraction to fatigue at all loadings. 相似文献
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对肱二头肌在不同负荷及不同速度收缩时的肌电变化进行了观察。结果发现,肱二头肌进行快收缩(每秒钟一次的速度屈时)和慢收缩(每两秒种一次的速度屈肘)时的IEMG 在3种负荷中(5kg、10kg、15kg),无论是疲劳前还是疲劳后,均没有明显的差异;在3种负荷工作中,肱二头肌进行动力性收缩(5kg、10kg)至疲劳时,其IEMG 值较疲劳前明显增高;当负荷为15kg 时,IEMG 值疲劳后明显下降;在所有负荷到疲劳时MPF 下降。 相似文献
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针对目前在高空风测量中使用的普通测风经纬仪需手工记录观测数据、手工录入数据计算,整个测量过程程序繁琐,而且需要多名测量员协同,同步性和实时性难以保证,造成较大的误差和人力损耗,很难保证气象数据采集和分析的数据准确性和可靠性。本文提出了一种解决上述问题的方法并设计了一种新的智能化、应用范围广的数字化小球测风系统。在测量过程中只需人工跟踪测风气球,系统能够自动采集测风数据并且自动计算测风结果。系统包括：电子测风经纬仪、CC1010数据采集板、FT232RL（USB转串口芯片）和笔记本计算机。 相似文献