Leaching behavior of V,Pb, Cd,Cr, and As from stone coal waste rock with different particle sizes

This paper investigates the leaching behavior of heavy metals (V, Pb, Cd, Cr, and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments. The results show that the dissolved concentrations of V and As initially increased and then slightly decreased as time progressed and that the dissolved concentrations of Pb, Cd, and Cr were high in the early stage before decreasing. The particle size of the stone coal waste rocks strongly influenced the heavy metal concentration in the leaching solutions. The effects of the particle size of the stone coal waste rocks on the dissolved concentrations of V, Pb, and As decreased in the order fine fraction > medium fraction > coarse fraction, and the effects of particle size on the dissolved concentrations of Cr and Cd decreased in the order medium fraction > coarse fraction > fine fraction and coarse fraction > medium fraction > fine fraction, respectively. The quantities of heavy metals dissolved from the stone coal waste rock with fine particle sizes were observed to decrease in the order V (17104.36 μg/kg) > As (609.41 μg/kg) > Pb (469.24 μg/kg) > Cr (56.35 μg/kg) > Cd (27.52 μg/kg), and the dissolution rates decreased in the order As (2.96%) > Pb (0.93%) > V (0.35%) > Cd (0.25%) > Cr (0.01%). The specific surface area, pore size of the stone coal waste rocks, and chemical forms of heavy metals also influenced the release of heavy metals from the stone coal waste rocks. Kinetic analysis showed that the dissolution of heavy metals fundamentally agreed with the rate equation controlled by the shrinking core model. The results of this study are expected to serve as a reference for the evaluation of heavy metals contamination from stone coal waste rocks.     

石墨烯复合材料在警车防弹防护方面的研究

研究警车高性能防弹防护材料应用技术,尝试采用石墨烯改性的方式对陶瓷及铝合金的强度、韧性性能进行了改性提升,利用石墨烯改性材料制备了复合防弹板,并进行了实弹射击试验,研究了防弹警车应用可行性.试验结果表明,石墨烯改性可以有效提高陶瓷的断裂韧度,以及铝合金的强度及弹性模量.经53式7.62 mm穿甲弹三次射击,靶板无穿透,用石墨烯改性陶瓷制备的防弹装甲板,可有效降低材料密度,大幅度提高防弹性能,对车辆防弹性能及轻量化技术研究具有一定的参考价值.     

中国专利检索系统的比较分析

比较了中国知识产权局专利检索系统、中国知识产权网专利检索系统以及CNKⅡ知识创新网中国专利数据库各自的特点，提出根据不同的检索需求进行适当的选择的建议。     

基于数据采集的虚拟数字存储示波器

用通用数据采集卡构成虚拟数字存储示波器系统,并讨论虚拟数字存储示波器的功能实现及软件设计方法     

含未知参数的多分量Chirp信号的分数阶傅里叶分析

目的 提出基于分数阶傅里叶变换（ＦＲＦＴ）的含未知参数的多分量Ｃｈｉｒｐ信号的检测和参数估计方法。方法 由分数阶傅里叶变换的Ｃｈｉｒｐ基分解特性及其与时频分布的关系论证多分量Ｃｈｉｒｐ信号的分数阶傅里叶分析方法,并通过计算机模拟验证方法的有效性。结果与结论 和联合的Ｗｉｇｎｅｒ－Ｖｉｌｌｅ分布（ＷＶＤ）及Ｈｏｕｇｈ变换（ＨＴ）方法相比,基于ＦＲＦＴ的含未知参数的多分量Ｃｈｉｒｐ信号的分析方法,不用     

深黄被孢霉Mortierella isabelina粉对小鼠LPO、SOD和免疫器官的影响

以昆明种小鼠为对象分别研究了深黄被孢霉粉对小鼠LPO、SOD、抗疲劳、耐缺氧等生理指标以及对脾脏、胸腺等免疫器官的影响。昆明种小鼠分组，分别灌服深黄被孢霉粉和等量生理盐水，每d1次，15d后测定各项生理指标。结果表明，试验组动物血清LPO含量比对照组下降0.8mmol/L,SOD含量升高187u/ml，抗疲劳时间延长62min，耐缺氧能力延长6min，胸腺指数增中1.7%，脾指数增加5.6%。结果显示深黄被孢霉粉具有拮抗自由基、延缓衰老、抗疲劳、耐缺氧、抵抗不良环境和增强免疫功能的作用。     

Development of a middle and low latitude theoretical ionospheric model and an observation system data assimilation experiment

On the basis of previous work, we develop a middle and low latitude theoretical ionospheric model in this paper, named Theoretical Ionospheric Model of the Earth in the Institute of Geology and Geophysics, Chinese Academy of Sciences （TIME-IGGCAS）. TIME-IGGCAS solves the equations of mass continuity, motion and energy of electron and ions self-consistently and uses an eccentric dipole field approximation to the Earth＇s magnetic field. We combine the Eulerian and Lagrangian approaches in the model and take account of the plasma ExB drift velocity. Calculation results reveal that the model is steady and credible and can reproduce most large-scale features of ionosphere. By using TIME-IGGCAS, we carried out an observation system data assimilation experiment. Assimilation results show that the ExB drift velocity can be accurately estimated by ingesting the observed foF2 and hmF2 into the model applying nonlinear least-square fit method. We suggest that this work is of great significance in the development of ionospheric data assimilation model to give better nowcast and forecast of ionosphere.     

多分类器组合的投票表决规则

为了提高多分类器组合的效果 ,提出了一种改进的投票表决规则 .每个分类器对每个模式类别的识别能力不尽相同 ,通过对大量样本的统计 ,获得有关每个分类器识别性能的先验知识 ,将其作为投票表决的依据 .投票表决时每个类设置不同的表决阈值 ,使组合效果得以改善 .这些阈值可以通过训练获得 .在数字识别系统中的实验结果表明 ,该方法使多分类器组合的识别率和置信度明显提高     

近红外光谱技术对液态奶制品中乳糖、脂肪及蛋白质的定量检测

用InfraXact多功能近红外分析仪和正交实验设计,研究了不同预处理和校正方法对建模效果的影响,建立了液态奶制嘉中脂肪、乳糖和蛋白质质量含量的定标模型。利用目标函数法对模型进行评定,并对选出的最优模型的适用性进行验证．结果表明,最优模型对糖、脂肪和蛋白质的相对标准偏差分别为4．12％,7．04％,9．61％,相对误差分别为2．82,6．28,2．72．正交实验方法能综合考虑不同预处理方法和校正方法对模型建立的影响．近红外光谱分析法能够实现对牛奶中脂肪、乳糖和蛋白质质量含量进行快速、无损的定量检测．     

水泡梅太阳能干燥的试验研究

文章提出了一种空气集热器-温室型强制对流太阳能干燥装置，并在云南洱源的气候条件下验证了水泡梅太阳能干燥的可行性，从2003年3月到5月问，进行了一系列的试验，试验表明，和传统的露天自然摊晒相比，干燥周期从48天缩短到15天，干燥质量也有大幅度的提高。