基于神经网络模型的产品属性情感分析

针对基于词向量的神经网络模型在产品属性情感分析中效果不佳的问题,提出一种集成离散特征和词向量特征的开关递归神经网络模型。首先,通过直接循环图为语句建模,采用开关递归神经网络模型完成产品属性情感分析任务;然后,在开关递归神经网络模型中集成离散特征和词向量特征;最后,分别在流水线、联合、折叠三种任务模型中完成属性提取和情感分析任务。以宏观F1分数作为评估指标,在SemEval-2014的笔记本电脑和餐馆评论数据集上做实验。开关递归神经网络模型的F1分数为：48.21%和62.19%,超过普通递归神经网络模型近1.5个百分点,因而开关递归神经网络能够有效捕获复杂特征,提升产品属性情感分析的效果。而集成离散特征和词向量特征的神经网络模型的F1分数为：49.26%和63.31%,均超过基线结果0.5到1个百分点,表明离散特征和词向量特征互相促进,另一方面,也表明仅仅基于词向量的神经网络模型仍有提升空间。三种任务模型中,流水线模型的F1分数最高,表明应将属性提取和情感分析任务分开完成。     

α-PSMA共聚物与PMMA共混物的相容性

用浊点测定、傅里叶变换红外光谱、微差扫描热分析和透射电子显微镜等方法研究了苯乙烯-顺丁烯二酸酐交替共聚物(α-PSMA)与聚甲基丙烯酸甲酯(PMMA)的相容性。结果表明:α-PSMA共聚物与PMMA共混物在共混比7/93～30/70范围内相容性得到改善,其原因是由于α-PSMA与PMMA之间存在特殊的相互作用。     

中国建材集团公司1991年生产经营情况

一、中国新材料公司1991年以来,新型建材市场有所回升,全年的生产形势比1990年有较大的好转。特别是装饰装修材料市场回升较快,增产幅度较大。但是,由于市场发展不平衡,某些产品如墙体材料和卫生陶瓷等,1991年的产销量反而比1990年有所下降。1.1～11月份,全公司工业企业累计完成工业总     

基于工业污染源环境统计数据的总量制度的作用与局限研究

以上海市某区2012—2016年工业企业环境统计数据为例,介绍了该区实施总量制度以来,区域工业企业的总量控制指标变化趋势,分析了工程减排、结构减排和管理减排在促进产业结构升级调整、污染物减排等方面总量制度实施的重要作用。提出了加大重点区域环境综合整治、加强工业企业事中事后监管、推进环境污染第三方治理模式等工作建议。     

16s rDNA based microbial diversity analysis of eleven acid mine drainages obtained from three Chinese copper mines

Eleven acid mine drainage (AMD) samples were obtained from southeast of China for the analysis of the microbial communities diversity, and the relationship with geochemical variables and spatial distance by using a culture-independent 16S rDNA gene phylogenetic analysis approach and multivariate analysis respectively. The principle component analysis (PCA) of geochemical variables shows that eleven AMDs can be clustered into two groups, relative high and low metal rich (RHMR and RLMR) AMDs. Total 1 691 clone sequences are obtained and the detrended correspondence analysis (DCA) of operational taxonomic units (OTUs) shows that, γ-Proteobacteria, Acidobacteria, Actinobacteria, Cyanobacteria, Firmicutes and Nitrospirae are dominant species in RHMR AMDs. In contrast, α-Proteobacteria, β-Proteobacteria, Planctomycetes and Bacteriodetes are dominant species in RLMR AMD. Results also show that high-abundance putative iron-oxidizing and only putative sulfur-oxidizing microorganisms are found in RHMR AMD. Multivariate analysis shows that both geochemical variables (r=0.429 3, P=0.037 7) and spatial distance (r=0.321 3, P=0.018 1) are significantly positively correlated with microbial community and pH, Mg, Fe, S, Cu and Ca are key geochemistry factors in shaping microbial community. Variance partitioning analysis shows that geochemical variables and spatial distance can explain most (92%) of the variation.     

数字化印刷工作流程中的油墨预置技术

为了使JDF(job definition format)数字化印刷工作流程中油墨预置更加准确,根据胶印机中的油墨转移,对墨键开度和印张实地密度值的关系进行了理论分析;并结合油墨预置试验,拟合出墨键开度与印版网点面积率的关系曲线;在流程中用程序语言实现该关系的算法,从而实现油墨预置.结果表明,与传统油墨控制技术相比,该技术缩短了胶印机开机后的调整时间,量化了油墨预置数据,提高了印刷效率,降低了印刷成本.     

塔林西水利枢纽工程生态需水量计算与评估

规划拟建的塔林西水利枢纽工程是以发电为主,同时兼有防洪、改善生态环境、养鱼、森林防火、旅游等综合利用效益的大型水利枢纽工程。工程的建设将改变坝下的水文情势,对呼玛河自然保护区的鱼类资源带来一定的影响。为了减缓水文情势变化对下游水生生物的不利影响,就要确保河道内的生态需水量。在分析坝下生态保护目标的基础上,利用Tenna...     

某电厂末再出口小集箱管接头焊缝裂纹原因分析

本文通过对某锅炉项目末再出口小集箱角焊缝根部存在裂纹样品,进行化学成分分析、维氏硬度分析、扫描电镜分析及宏微观分析,分析结果表明:末再出口小集箱管接头角焊缝附近的裂纹属于低周疲劳裂纹。     

Mutagenic breeding of silver-resistant Acidithiobacillusferrooxidans and exploration of resistant mechanism

The silver-resistant Acidithiobacillus ferrooxidans were isolated from 22 acid mine drainage （AMD） samples collected from Dexing Copper Mine and Chengmen Mountain Mine, Jiangxi Province, China. Isolate DX16 is obtained from the sample taken from Dexing Copper Mine and still carries out ferrous ion oxidation when incubated in 9K medium containing silver nitrate （240 mg/L）. While isolate HI, a less resistant strain taken from Yin Mountain Mine, has a tolerate level of only 60 mg/L. Based on 16S ribosomal DNA sequencing, both bacterial 16SrDNA sequences are 100% similar to Acidithiobacillus ferrooxidans ATCC 23270. Through ultraviolet irradiation induced mutations, isolate mDX16 that is obtained from DX16 carries out ferrous ion oxidation when incubated in 9K medium containing higher concentration of silver nitrate （250 mg/L）. When silver-resistant gene （SilC） analysis is carried out on the two isolates, it is seen that this gene was absent in both.