Identification of structural entities in NdF3-LiF melts with cryoscopic method

Nd-F species in NdF3-LiF melts were studied using cryoscopic method.Liquidus temperatures of melts of various compositions were determined by differential thermal analysis(DTA).Based on the different model calculations,NdF4- was identified as the most likely Nd-F entity in the melts in which the mole fraction of NdF3 was lower than 20%,considering only one single Nd species in the melt,and which was formed in accordance with Temkin model or Flood model.Then,activities of different components in the melts were researched.The results show that activity of LiF decreases,and that of NdF3 increases with increasing the mole fraction of NdF3.The value of activity coefficient of NdF3 is higher than 1,and that of LiF is lower than 1.     

水电工程征地移民实物指标管理系统的设计与实现

水电工程移民管理业务中产生了大量的数据,特别是所涉及的移民实物指标种类繁多,数据量较大.在当今管理要求不断提高和信息技术日益普及的环境下,传统的手工操作方式已经不能满足移民精细化管理工作的要求,必须采用先进的技术手段和工具提高工作的效率.结合系统开发的实际情况,介绍了水电工程征地移民实物指标管理系统的设计开发、组织、规范和工具等情况,对系统所实现的功能进行了分析,为该系统的推广使用创造了一定的条件.     

Metal-doped carbon aerogels as catalysts during ozonation processes in aqueous solutions

The efficiency of Co(II)-, Mn(II)-, and Ti(IV)-doped carbon aerogels for the transformation of ozone into (*)OH radicals was investigated. The carbon aerogels had a markedly acid surface character (pH(PZC approximately equal) congruent with 3-4) with very high surface oxygen concentrations (O approximately equal with 20%). X-ray photoelectron spectroscopy (XPS) analyses of the samples showed the oxidation state of the metals was +2 for Co and Mn and +4 for Ti. The presence of Mn(II)-doped carbon aerogel enhanced ozone transformation into (*)OH radicals, whereas the presence of Co(II) and Ti(IV) carbon aerogels presented no activity in this process. Moreover, it was observed that an increase in the concentration of Mn in the surface of the aerogel increases its efficiency to transform ozone into (*)OH radicals, with an Rct value ([OH]/[O(3)]) of 5.36 x 10(-8) for the aerogel doped with 16% of surface Mn(II) compared to an R(ct) of 2.68 x 10(-9) for conventional ozonation. Regardless of the aerogel used, XPS analysis of the ozonated aerogel samples showed an increase in the concentration of surface oxygen when the exposure to ozone was longer. However, presence of oxidized metal species after ozone treatment was only detected in the case of the Mn-doped aerogel, (Mn(III) and Mn(IV)). CO(2) activation of carbon aerogel produced a marked increase in its efficiency to transform ozone into (*)OH radicals compared with non-activated sample. The efficiency of Mn activated carbon aerogel to transform ozone into (*)OH radicals was greater than that of Witco commercial activated carbon or H(2)O(2) in the ozonation of water from Lake Zurich (Zurich, Switzerland).     

Metabolic profile and biological activities of Lavandula pedunculata subsp. lusitanica (Chaytor) Franco: Studies on the essential oil and polar extracts

We investigated the metabolic profile and biological activities of the essential oil and polar extracts of Lavandula pedunculata subsp. lusitanica (Chaytor) Franco collected in south Portugal. Gas chromatography–mass spectrometry (GC–MS) analysis revealed that oxygen-containing monoterpenes was the principal group of compounds identified in the essential oil. Camphor (40.6%) and fenchone (38.0%) were found as the major constituents. High-performance liquid chromatography with diode array detection (HPLC–DAD) analysis allowed the identification of hydroxycinnamic acids (3-O-caffeoylquinic, 4-O-caffeoylquinic, 5-O-caffeoylquinic and rosmarinic acids) and flavones (luteolin and apigenin) in the polar extracts, with rosmarinic acid being the main compound in most of them. The bioactive compounds from L. pedunculata polar extracts were the most efficient free-radical scavengers, Fe²⁺ chelators and inhibitors of malondialdehyde production, while the essential oil was the most active against acetylcholinesterase. Our results reveal that the subspecies of L. pedunculata studied is a potential source of active metabolites with a positive effect on human health.     

融合多模式匹配的网络信息实体关联研究仿真

对网络信息实体进行关联匹配,能够更好的实现网络数据的传递和分析.由于网络数据呈现多源异构,以及非均匀分布等特征,导致难以对其信息实体进行准确快速的关联匹配.由此,提出了融合多模式匹配的网络信息实体关联策略.策略考虑了网络信息实体的复杂性与动态性,首先设计了语法相似性,对大量简单信息实体进行快速匹配;然后基于深度与距离设...     

中文维基百科的实体分类研究

维基百科实体分类对自然语言处理和机器学习具有重要的作用。该文采用机器学习的方法对中文维基百科的条目进行实体分类,在利用维基百科页面中半结构化信息和无结构化文本作为基本特征的基础上,结合中文的特点使用扩展特征和语义特征来提高实体分类性能。在人工标注的语料库上的实验表明,这些额外特征有效地提高了ACE分类体系上的实体分类性能,总体F1值达到96%,同时在扩展实体分类上也取得了较好的效果,总体F1值达95%。
     

Minnesota,microgrids and MISO: Getting down to brass tacks on utilizing utility owned/operated microgrids (UOMs) in organized electricity markets

The need for resilient and reliable electric power sources have led to the rise of microgrids. These small power systems are able to provide continued electric power supply to those connected in times of very large scale events (VLSEs) that affect a portion of the larger electric grid. Microgrid systems have also being proposed as a route to “leap frog” the development of electric power systems in parts of the world that still lack access to electricity. In this paper microgrids in the state of Minnesota are considered. The concept of a Utility Owned/Operated Microgrid (UOM) is considered. An important Microgrid Potential Study for Minnesota is analyzed. The potential of using UOMs to provide grid reliability and resilience services in Minnesota, while at the same time providing value for electric utilities through their participation in the Midcontinent Independent System Operator’s (MISO) electricity market is considered.     

农村经营制度创新若干问题探讨

农村经营制度的创新,其实质就是如何推进农村的统一经营。要推进农村统一经营,必须要有相应的制度供给,包括村民自治制度、土地制度、经营主体制度。这些制度具体又该如何构建,则取决于对统一经营的性质、统一经营与政府干预、统一经营与土地制度的逻辑关系以及统一经营主体与农村中的相关组织之间的关系的认识。     

基于卷积神经网络的食品安全领域谣言检测方法

近年来,食品安全已经成为政府和社会最关心的问题之一。与此同时,大量食品安全领域的谣言也在社交媒体平台上疯狂传播。现有的研究大多针对通用领域的谣言进行检测,忽视了不同领域谣言之间存在的差异性。针对食品安全这一领域谣言的特点,提出一种基于卷积神经网络的食品安全领域谣言检测方法。用领域实体抽取策略得到的实体特征与文本卷积神经网络提取的深度文本特征做拼接融合,再进行谣言判断。实验结果表明,在食品安全领域谣言数据集上,采用该方法检测效果明显优于通用的谣言检测方法,在准确率、召回率和F1值等评价指标上都表现最优。