基于改进的Bayes判别法的中文多义词消歧

介绍了词义消歧研究的进展。对基于Bayes判别法的词义消歧算法做了改进,加大与多义词存在句法依存关系的特征词在Bayes判别公式中的权值比重,较好改善词义消歧的效果,并设计对比实验,验证了改进算法的优越性,分析了语料规模、数据噪声、数据稀疏问题对词义消歧的影响的规律。     

Sensing mechanism of Ag/α-MoO3 nanobelts for H2S gas sensor

Sensing mechanism is still a big problem in the field of gas sensor.In-depth study of the sensing mecha-nism can provide better ideas for the design of sensing ...     

2%CrMoNiWV高低压复合转子材料的研究

试验研究了2%CrMoNiWV高低压复合转子材料。试验件在950℃奥氏体化,高压区模拟直径1350mm,模拟喷雾冷速为2.5℃/min,回火温度为660～690℃;低压区模拟直径2500mm,模拟喷水冷速为3℃/min,回火温度为630～660℃。结果表明,综合力学性能达到了目标要求。     

喷射式凝汽器传热性能影响因素分析

空冷机组是解决富煤贫水地区电力工业发展问题的有效措施,近年来在国内外发展迅速。作为海勒式间接空冷系统的关键设备,喷射式凝汽器的性能与整个空冷机组的性能直接相关。介绍了国内外喷射式凝汽器的研究现状,分析了影响喷射式凝汽器传热性能的主要因素。     

Characterization,Expression Profiling,and Biochemical Analyses of the Cinnamoyl-CoA Reductase Gene Family for Lignin Synthesis in Alfalfa Plants

Cinnamoyl-CoA reductase (CCR) is a pivotal enzyme in plant lignin synthesis, which has a role in plant secondary cell wall development and environmental stress defense. Alfalfa is a predominant legume forage with excellent quality, but the lignin content negatively affects fodder digestibility. Currently, there is limited information on CCR characteristics, gene expression, and its role in lignin metabolism in alfalfa. In this study, we identified 30 members in the CCR gene family of Medicago sativa. In addition, gene structure, conserved motif, and evolution analysis suggested MsCCR1–7 presumably functioned as CCR, while the 23 MsCCR-likes fell into three categories. The expression patterns of MsCCRs/MsCCR-likes suggested their role in plant development, response to environmental stresses, and phytohormone treatment. These results were consistent with the cis-elements in their promoters. Histochemical staining showed that lignin accumulation gradually deepened with the development, which was consistent with gene expression results. Furthermore, recombinant MsCCR1 and MsCCR-like1 were purified and the kinetic parameters were tested under four substrates. In addition, three-dimensional structure models of MsCCR1 and MsCCR-like1 proteins showed the difference in the substrate-binding motif H212(X)2K215R263. These results will be useful for further application for legume forage quality modification and biofuels industry engineering in the future.     

大型风力发电场并网接入运行问题综述

指出风电场与常规能源电厂的主要区别,介绍了恒速恒频和变速恒频两种风力发电系统的运行原理及各自接入电力系统的现状和主要问题,阐述了风力发电场并网过程时电网产生冲出,风电场运行对电能质量、保护装置、电网频率和对电力系统运行成本等几方面产生的影响.     

FNN与混合遗传算法在智能优化的策略比较

FNN是一种重要的神经网络结构,混合遗传算法是一种正在兴起的启发式随机搜索技术,两者在智能优化中得到了广泛的应用。两者的优化机理不同,方法不同,各有千秋。论文从提高两者的优化性能出发,研究其智能优化的实现策略,并对两者进行了比较,得出了有意义的结论。     

双足足球机器人守门策略研究

首先提出了双足足球机器人的体系结构,然后给出了基本步态算法,针对FIRA类人型项目比赛规则,提出了全新的双足足球机器人守门策略,最后给出了分析测距试验数据,验证了测距准确性和守门策略的合理性.     

基于PCA的决策树算法在心脏病诊断中的应用

主成分分析（Principal Component Analysis,PCA）可以处理大量过程参数间的关系与变化,排除次要因素,提取主要因素。文章将主成分分析和决策树C4.5算法相结合,提出一种心脏病诊断预测的新方法,该方法采用PCA方法对影响心脏病诊断的众多变量进行降维处理,减少了预测模型的输入量,消除输入数据间的相关性,用C4.5算法建立心脏病诊断的预测模型。经实验证明有效的提高了C4.5算法的分类正确率,提高了心脏病诊断的正确率。     

多功能Pt-Ce6纳米平台作为过氧化氢纳米酶和NIR-Ⅱ光热剂用于增强PDT/PTT肿瘤治疗

实体肿瘤的缺氧严重影响着基于氧气的光动力疗法(PDT)的效果.另外,单一治疗模式通常难以达到满意的治疗效果.为此,我们设计合成了一种多功能纳米复合材料Pt-Ce6用于克服肿瘤乏氧,实现PDT/PTT协同治疗.在该体系中,我们使用多孔Pt纳米粒子作为过氧化氢纳米酶、近红外二区(NIR-Ⅱ)光热转换剂和光敏剂二氢卟吩e6(...