基于无线网络的矿井安全监控系统设计

为了改善煤矿安全生产状况,在煤矿井下环境信息监控和人员定位监控的需求的基础上,采用了一种无线与有线相结合的井下通信方法,构建了一个基于以太网络和Zigbee无线传感器网络的矿井安全监控系统的总体架构。设计最终搭建了系统的总体架构,并设计了汇聚节点,数据采集节点和人员定位节点等主要节点。设计的矿井安全监控系统可以实时采集井下的环境参数,井上的监控微机可以接收采集到的数据,能够实时反映井下人员的位置。该系统对井下安全状况的评估具有一定的参考价值和指导意义。     

高压密封消解ICP—MS测定钩藤不同部位微量元素

本文建立了钩藤药材中微量元素含量测定方法。方法：样品采用高压密封消解后,用电感耦合等离子体质谱仪（ICP—MS）测定钩藤不同部位微量元素。结果：该方法简便、快速、准确,工作曲线相关系数r≥0．9967,各元素检出限为0．0021～9．46rig／m1,标准偏差为1,29～2．80,加标回收率为93,9％～106．0％,适用于钩藤中微量元素含量的测定。本实验测得Na、K、Fe、Eu、Mo、Sb、Hg在钩中的含量大于茎中的含量,有害元素A8、cd、sb、Ph在钩和茎中的含量都很低。     

A RGB LED driving structure and signal processing based on tone-to-color conversion

In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features (loudness, tone, rhythm) is applied to control LED color, a linear conversion solution is proposed. And a chromaticity diagram is defined by using hue definition on hue-saturation-lightness (HSL) hue ring and the normalization of CIE xyY which is a color standard defined by International Commission on Illumination (CIE). The chromaticity diagram shows a linear relation between pitch and color, which is referred to conversions of other physical parameters as well. Based on the solution, red (R), green (G) and blue (B) LEDs, the driving structure of a conversion circuit is designed and set up. The results indicate that signal processing of tone-to-color conversion is effective, from 30 Hz to 3 kHz with a resolution of 10 Hz mapped to the chromaticity diagram.     

中国丹霞第一瀑--赤水十丈洞成因探讨

贵州黄果树和十丈洞两大瀑布群的成因进行对比分析，十丈洞瀑布从地质背景、地层岩性特征及流水、风化和重力崩塌等内外营力作用探讨其成因，认定十丈洞瀑布是发育在河流溯源侵蚀裂点上又因岩性的差别侵蚀作用形成的。十丈洞独特的丹霞地貌景观、保存完好的亚热带森林生态环境具有极高的科研和旅游价值。     

贵州高砷煤矸石高温氧化及浸出污染特征研究

贵州兴仁高砷煤矿区堆积了大量煤矸石,煤矸石的自燃及自燃后降雨淋滤将释放出大量有害物质.本文就兴仁高砷矸石在高温绝热条件下的氧化特征及氧化残渣的浸出污染特征进行了研究,对矸石在100℃,300℃,500℃,700℃,1 000℃不同温度下的氧化燃烧烧失特性、残渣的表面形貌特征、残渣浸出液pH,Eh,EC及As,Fe,Cd,SO2-4等离子浓度特征进行了研究.结果表明,煤矸石在不同温度下的氧化燃烧特性差异极大:温度越高,矸石烧失量越大;温度高于500℃时,煤矸石所含黄铁矿中硫主要被氧化生成硫的气态产物;氧化残渣浸出液中As的浓度是随矸石氧化温度的升高而增加的,1 000℃的高温氧化残渣浸出液中As的浓度高达88.58μg/L.在高砷煤矿区,防止矸石自燃对于保护矿区空气、水体及土壤免受污染均具有重要意义.     

纳秒激光加工生成硅量子点的发光性质研究

该文报道氧气、氮气或空气等不同氛围中用纳秒脉冲激光在硅基上加工生成量子点结构,发现这些样品在700 nm波长附近均有增强的光致发光(Photoluminescence,PL),且各样品的PL峰很相似;经适当退火处理后,在某些样品上观察到随机受激发光.通过第一性原理计算,发现各种量子点结构表面的成键类型与密度是形成PL发光增强的关键,并由此提出相应的物理模型.     

A Systematic Overview of Blockchain Research

Blockchain has been receiving growing attention from both academia and practices. This paper aims to investigate the research status of blockchain-related studies and to analyze the development and evolution of this latest hot area via bibliometric analysis. We selected and explored 2451 papers published between 2013 and 2019 from the Web of Science Core Collection database. The analysis considers different dimensions, including annual publications and citation trends, author distribution, popular research themes, collaboration of countries(regions) and institutions, top papers,major publication journals(conferences), supportive funding agencies, and emerging research trends.The results show that the number of blockchain literature is still increasing, and the research priorities in blockchain-related research shift during the observation period from bitcoin, cryptocurrency,blockchain, smart contract, internet of thing, to the distributed ledger, and challenge and the inefficiency of blockchain. The findings of this research deliver a holistic picture of blockchain research,which illuminates the future direction of research, and provides implications for both academic research and enterprise practice.     

贵州长顺睦化泥盆—石炭系界线层型候选剖面背景材料

贵州长顺睦化泥盆——石炭系界线层型候选剖面是世界上泥盆——石炭系界线层型剖面各种因素最佳的候选剖面。如被选或国际泥盆——石炭系界线层型剖面,不仅具有学术意义、而具有政治意义。     

多个未满L次壳层等效电子耦合原子态的矩阵计算

给出用Matlab编程计算多个未满l次壳层的等效电子LS耦合原子态的矩阵计算方法,具体计算了5f46d电 子组态LS耦合原子态.     

三年生南方红豆杉扦插苗速生技术研究

3年生南方红豆杉扦插苗的生长期在3～11月,5～9月是生长高峰期。ABT1生根粉20mg/L水溶液有明显促进扦插苗枝条速生和提高扦插苗存活率的能力。