缅甸还原性次生化翡翠的傅立叶变换红外光谱分析

傅立叶变换红外光谱分析表明，原生翡翠与还原性次生化翡翠在3800-3000cm^-1范围内，具有不同的红外吸收图谱标型特征，原生翡翠出现右倾斜的“V”字形吸收曲线，峰谷尖锐，吸收率低；还原性次生化翡翠出现“U”字形吸收曲线，峰谷宽阔，吸收率较高。其原因可能与还原性次生化翡翠的微裂隙中穿插充填有绿泥石等含水的粘土类矿物，使其红外光谱在3800-3400cm^-1区段叠加有粘土矿物中水和羟基的吸收峰有关。     

Can LEDs help with art conservation? – Impact of different light spectra on paint pigment degradation

The impact of the spectral composition of light on the discoloration of paint pigments has been investigated for the case of lead chromate sulfate, an unstable yellow pigment used by Vincent van Gogh and other painters. With LEDification, museum lighting is moving from using halogen to LED lamps. LED light sources have a significantly different spectral composition than halogen lamps. To understand the impact of these differences on pigment stability, the wavelength dependence of pigment discoloration was determined. Contrary to the expectation that lower wavelength photons induce more damage than higher wavelength ones, UV (394?nm), blue, and cyan light all lead to similar levels of discoloration of a pigment for the same level of radiant power. By understanding this wavelength dependence, it becomes possible to create white light LED lamps with a spectral composition tuned to minimize the degradation effect. An existing LED solution with a modified emission indeed resulted in 30% less color change in the experiment than halogen. Furthermore, a method is proposed to optimize the LED spectra by tuning to the properties of each specific artifact. Simulations show that this can reduce the damage of the light source by 45% in specific cases.     

火焰原子吸收光谱法最佳测试条件的选择

本文从七个方面分析论述了火焰原子吸收光谱法的最佳测试条件，并强调了应综合考虑，优化组合最佳测试条件，并用Zn、Pb、Cd标准水样的实测结果与标准值对比后的结果对理论分析进行验证。     

试析中国神话的传播方式和演进趋向

神话在演进中淘沥,有反映“推原开辟”、“征服自然”、“劳动斗争”和“爱情婚姻”的精品,也有“仙话”、“鬼话”和封建宿命论的糟粕,神话是各族人民集体创作的思想化结晶,是史哲学可资借重的史料,其广阔的题材和积极浪漫主义的创作方法又是一切化艺术乃至科幻作品汲取营养的滥觞。     

学术期刊微信公众平台传播效果分析与运营对策--以教育类 CSSCI 学术期刊为例

为考察学术期刊微信公众平台的传播效果,调研2015年9月份在微信公众平台有内容发布的10家教育类CSSCI学术期刊,通过对比发布内容的单篇日均阅读量,发现目前学术期刊微信平台高质量原创比率较低、周期内发文数量与传播效果不呈线性关系、微信平台对于推送传统编辑形式学术论文传播效果甚微、平台用户的阅读密集行为多发生在下午和晚上时间。学术期刊在具体运营微信公众平台时应坚持推广高质量的学术论文,发布学术热点评论,分享学术经验;同时应丰富编辑形式,增强与受众互动,注重数据分析,拓展推广渠道。     

m序列扩频系统抗干扰能力分析

扩频技术由于其本身具备的优良性能而得到广泛应用,其最主要的应用是军事抗干扰通信,直扩系统则是这一领域应用最多的奇扩频方式之一。本文以基于m序列的直扩系统为例,详细分析了其抗各类干扰的能力,指出m序列的相关性和随机性是扩频系统抗干扰的直接原因,提出寻找理想的扩频码来提高扩频系统的抗干扰能力。     

调幅信号调制方式的分类与识别

调制样式识别和调制参数估计是电子对抗中的一个重要环节,也是信号分析的一个快速发展的领域。本文主要分析了模拟调幅AM和数字调幅2ASK及4ASK信号,然后提取了能有效区分它们的特征参数,用MATLAB软件完成了仿真实验。实验证明本文提取的特征参数是非常有效的。     

论《桃花扇》在康熙朝的传播

<桃花扇>定稿于1699年,在康熙朝后期短短二十多年时间里,经历了抄本流传、舞台演出和刻本流传等多种传播方式,得到广泛的传播,成为当时家喻户晓的名剧.     

清中期黟县民众的信仰世界及所蕴涵的文化意义——以《菩萨谱》所载祭祀科仪为中心展开的讨论

新近发现的清中期黟县钞本《菩萨谱》包含了大量民间信仰信息,所收信仰以家庭祭祀为主,广涉各路神众,反映出当时徽州民众生活在一个由多种祭祀仪式构成的民间信仰世界之中,生老病死、衣食住行,生产、生活的每一重要方面都与民间信仰息息相关。同时《菩萨谱》中反映出的信仰世界带有鲜明的小传统特色,揭示出了民间信仰世界中三教融合的真实情况。     

Field experiment on train-induced embankment vibration responses in seasonally-frozen regions of Daqing, China

The seasonal-frozen layer may have an influence on embankment motion from train-induced vibrations. Based on the field monitoring in a seasonally-frozen region of northeastern China, the effects of the frozen layer on the embankment responses to train-induced vibration were investigated in winter and summer via acceleration time histories and acceleration frequency spectrums. The results show that： （1） Compared to unfrozen soil conditions, the amplitudes of longitudinal and vertical vibrations at the points near the rail were increased, different influences of freight versus high-speed trains are the most evident. （2） With greater distance from the rail, the dominant frequency ranges of embankment with both frozen and unfrozen layers narrowed and shifted to low frequency bands. （3） The predominant frequency of embankment vibration with frozen soil layers shifted to higher frequencies with the increased train speed, although there was little change with unfrozen condition. Layer condition （frozen versus unfrozen） and distance to rail both play important roles in investigating the embankment vibration characteristics and rail transit field monitoring to improve the criterion of the rail construction in seasonally-frozen regions.