Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：2020年9月,中共中央办公厅、国务院办公厅印发了《关于加快推进媒体深度融合发展的意见》中明确要求以先进技术引领驱动融合发展。本文探索如何利用增强现实技术为移动新闻客户端赋能,从而实现新闻内容的精细化、互动化和沉浸化,助力媒体深度融合。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着5G时代的到来,短视频成为移动互联网的"风口",牢牢抓住了用户的碎片化时间。短视频正逐步成为新闻客户端内容的重要表现形式,本文通过"短视频+"人工智能技术,探索如何构建智能视频能力,赋能媒体深度融合。
Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] By analyzing the effectiveness, experience and deficiencies of information literacy teaching assessment in domestic universities, the paper aimed to provide reference for subsequent empirical research.[Method/process] Based on the articles in China Academic Journal Network Publishing Database, and focusing on the effect of information literacy teaching and student learning, this paper discussed the assessment methods, types, and subjects using systematic review method.[Result/conclusion] The effectiveness of information literacy assessment used various methods(such as survey, scale, performance assessment, and group evaluation), and it had achieved certain achievements. However, the scientification of assessment methods, the diversification of assessment types, and the professionalization of assessment subjects still need to be improved.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The copper in copper-smelting slags can be removed effectively by means of chloridizing roast process, which is beneficial to recover iron from the copper-smelting slags. Thermodynamic analysis was carried out to characterize the performance of copper and iron during the chloridizing roast process. It follows that in a certain range of processing parameters, the copper removal rate can be enhanced with the increasing ing temperature and time for the process, and the increasing amount of CaCl2 addition and FeSO4. When the addition amount of FeSO4 was higher than 0.15 (mass ratio of FeSO4 to copper slags), SO2 was produced excessively and the (FeO) content in the reaction bed increased quickly. The generated FeO can be chlorinated easily, thereby caused an obvious increase of iron loss and decrease of the copper removal rates. The copper content in the slags decreased from 1.06% to 0.11% after a chloridizing roast treatment at 1373 K for 30 minutes, with an O2 flow velocity of 0.40 L穖in-1 and an addition amount of CaCl2 of 0.20 (mass ratios of CaCl2 to copper slags) and FeSO4 of 0.15(mass ratios of FeSO4 to copper slags).
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Cele Desert Research Station is located in the southern rim of Takelimagan Desert of Xinjiang, China. The fragile ecological environment and frequent sand storms in the area have seriously affected the livelihood, and restricted the economic and social development of the region. In the early 1980s, the frontier of the desert was only 1.5 km away from the town of Cele. Under this very urgent situation of “The sand at the gates”, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (the former of Xinjiang Desert Institute of Biological and Soil, Chinese Academy of Sciences) established Cele Desert Research Station, Chinese Academy of Sciences (hereinafter referred to as “Cele Station”). Researchers came to Cele, and started desertification prevention and control work. Since its establishment, Cele Station has accomplished a series of research and development achievements through longterm monitoring, research, experiments, and demonstration, focusing on the key scientific and technological issues urgently needed by regional fragile ecological environment management, and farmers and herdsmen to overcome poverty and increase their income. In terms of theoretical research, stress response mechanisms and adaptation strategies of dominant plants species in extreme arid regions were systematically expounded. In terms of technology research, development, application, and promotion, Cele Station has constructed the quick sand control model, put forward the technical system of restoring Tamarix chinensis vegetation in flood diversion irrigation, and remove the threat of quick sand invasion to Cele County. The technology has been widely applied in central Asia and Africa. The planting mode of high and stable yield of cotton and the technical system of inoculation of Cistanche were put forward. These practices have gained great economic and social benefits in Xinjiang. A technical system for optimizing the utilization of regional water resources has been established and popularized in Southern Xinjiang. Cele Station has become an important platform of scientific and technological research and development, and an experimental demonstration base, and has made important contributions to regional ecological environment construction, economic and social development.
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2020-06-21 Cooperative journals: 《干旱区研究》
Abstract：以塔克拉玛干沙漠南缘策勒绿洲-荒漠过渡带防护林下的骆驼刺和自然光照下的骆驼刺为研究对象，研究不同光照环境下骆驼刺地上生物量分配、叶片形态特征、叶绿素含量以及叶绿素荧光动力学参数的变化。结果表明:与自然光照下相比,① 林下骆驼刺比叶面积较高，而叶片厚度和叶干物质含量较低，地上生物量分配存在显著差异，叶比重升高，同化枝比重降低；② 林下骆驼刺的叶绿素a(Chl a)和叶绿素b(Chl b)含量明显较高，叶绿素a/b(Chl a/b)降低；③ 林下骆驼刺的最大荧光(Fm)、光系统Ⅱ(PSⅡ)潜在活性(Fv/Fo)、PSⅡ最大光化学效率(Fv/Fm)和单位面积反应中心的数量(RC/CSo)均显著升高，而单位反应中心吸收的能量(ABS/RC)、捕获的能量(TRo/RC)和耗散的能量(DIo/RC)低于对照条件下的骆驼刺。在林荫环境下，除了通过改变骆驼刺地上生物量的分配、叶形态特征来响应光照环境的变化外，叶绿素a/b(Chl a/b)比值的变化和PSⅡ光化学效率的提高，反应中心数量的增加也是骆驼刺适应荫蔽环境的重要生理途径。形态和生理上更好的光资源利用和响应特点是骆驼刺适应弱光环境的主要方式。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：针对大环境下的能源短缺与环境污染问题，提出了一种常见新型能源光伏 电池（PV）的建模方法。分析了常见的光伏电池 MPPT 算法，在此基础上对扰动观察 法进行了改进，克服了传统扰动观察法在距离最大功率点远近各有限制的缺点。利用 Matlab/Simulink 仿真平台搭建了光伏电池的数学模型，并根据改进的 MPPT 算法搭建 了控制电路。结果表明，该数学模型可以很好地模拟实际光伏电池的工作特性，改进 算法较好地弥补了传统算法的不足，可实现最大功率点跟踪。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：多电平逆变器存在直流侧分压电容不均压问题，这会引起输出电压和电流 波形畸变，使电路性能恶化或系统失控，甚至导致电平数跌落，使其失去多电平逆变 器原有的诸多优点。本文分析了单相三电平正激隔离逆变器的直流侧不均压问题，并 提出一种基于单相 SVPWM 技术的均压策略。该均压策略不增加原逆变器拓扑复杂度， 仅在 SVPWM 控制中加入判断环节，即可实现分压电容均压目的。最后经仿真实验验 证了该均压策略可靠性，仿真实验在 Power Simulation 环境下进行。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：本文首先介绍了一种基于交交直接变换器的新型无功补偿器，没有直流储 能环节，补偿器可靠性更好，成本更低。以推挽正激式交流变换器为研究对象，分析 了新型 STATCOM 的工作原理、补偿特性以及控制策略。首次将高频隔离变换器引入 新型 STATCOM 的研究，实现了网侧和补偿电容的电气隔离，增大了补偿器补偿容量。 提出了一种基于单相无功电流检测方法的直接电流控制方案，相较于目前基于正交分 解模块和 dq 坐标变换的控制方式，该方案计算量小，结构简单，容易实现。最后，进 行了仿真实验，验证以上理论分析以及本文提出的直接电流控制方案。仿真结果表明， 基于推挽正激式交流变换器的新型 STATCOM 可以实现对网侧无功电流的实时动态补 偿，系统稳定性好，闭环控制调节快速，无静态误差。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-24 Cooperative journals: 《计算机应用研究》
Abstract： For textual data with poor structured degree and different expression forms, a failures sequence pattern mining algorithm based on text information is proposed to explore the time sequence relationship between failures. In order to mine the failures rules from the text, firstly, quantify the text information, measure the similarity of the failures information, and classify the failures that express the same meaning into one class. On this basis, we propose the concept of maximum window threshold and minimum concurrence threshold based on failures characteristics, and build a mining algorithm framework forfailures sequence pattern. Finally, extract sequential failures patterns from a certain aircraft, and find out the correct faliures sequence relationship. The example shows that the proposed algorithm is correct and effective.
Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：目前对火星CH4气体的探测是探索火星生命的一项重要手段，圈定出火星表面CH4源区的位置可为将来火星生命的探索选取合适的目标点。本文在对火星CH4气体共振散射进行探测的基础上，通过数值模拟的方法对火星CH4气体的空间分布进行了反演。反演结果能再现模型的密度分布，辨认出CH4气体密度分布较为稠密的区域，从而可以确定出火星表面CH4源区的位置。
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract： Multi-point synchronous magnetic field measurements can give more accurate space current density compared with the traditional single-point measurement, since multi-point measurement can eliminate the temporal change in the magnetic field. Based on the current density inversion method for multi-point magnetic field measurements, through simulation, several factors affecting space current density inversion are analyzed, such as the number of satellites, satellite formation configuration, satellite positioning precision, satellite attitude determination error, magnetic field measurement accuracy, external magnetic field intensity, external current density and so on. It is shown that 5-point measurements are better than 4-point measurements, and error in attitude determination and external magnetic field intensity are the main factors causing the error in current density inverted, while satellite formation configuration is also an important factor. According to the simulation, the maximum error in current density is less than 24% near the equator when the attitude determination error is 0.001癮nd the scale of the satellite formation is about 100km.
Peer Review Status:Awaiting Review
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