丙烯酸乙酯合成反应产物的GC／MS分析

本文叙述了丙烯酸乙酯合成产物的ＧＣ／ＭＳ分析．从分析结果看出，本应在酯化反应前除去的ＣＨ３Ｃｌ３仍有较大的含量，这也许是导致丙烯酸乙酯被氯代的原因。     

基于朴素贝叶斯算法的中文评论分类

针对中文评论分类问题,采用朴素贝叶斯算法进行深入研究.首先,根据中文评论分类的需求设计了朴素贝叶斯分类器;然后,使用WEKA以不同特征提取方式对其功能性进行了对比分析.通过一系列的实验数据的横向对比表明,在朴素贝叶斯分类器下采用集成特征选取时文本分类的准确率最佳,准确率达97.65％,验证了朴素贝叶斯分类器在处理中文评论分类问题的可应用性.     

无刷直流电机远程调速控制方法

现阶段无刷直流电机常用的远程控制方法为有线控制和无线控制2种,有线控制需额外铺设控制信号线,无线控制则需增加遥控交互环节。针对上述弊端,设计了一种以可控整流信号波的形式发送速度控制信号,实现无刷直流电机远程调速控制的系统。该系统由整流控制单元和速度调节单元构成,整流控制单元发送可控整流信号波,速度调节单元接收该信号波并实现调速。该方法无需增加控制信号线,直接利用动力线即可实现对无刷直流电机速度大小和方向的远程控制。     

任务序列强度感知的大规模集群服务器控制模型

异构云数据中心各类服务器的控制成本和性能上的差异将影响其运维管理成本及QoS博弈平衡关系,针对任务序列强度具有的时效性,提出了任务序列强度感知的大规模任务调度模型。依据当前到达数据中心的任务序列的强度以及集群中服务器的当前状态,在任务调度中强调节约服务器运维管理成本和各服务器负载均衡的基础上实现优化数据中心对任务序列处理的平均响应时间和系统的吞吐量。通过对实验结果的分析,验证了集群服务器控制模型在任务调度中的可信度大于95%,同时通过与当前应用广且具代表性的算法——最短任务优先,公平分发机制进行比较分析,其效果是三者中最好的,也验证了模型的有效性和可行性。     

Preparation of zeolite NaA for CO2 capture from nickel laterite residue

Zeolite NaA was successfully prepared from nickel laterite residue for the first time via a fusion-hydrothermal procedure. The structure and morphology of the as-synthesized zeolite NaA were characterized with a range of experimental techniques, such as X-ray diffraction, scanning electronic microscopy, and infrared spectroscopy. It was revealed that the structures of the produced zeolites were dependent on the molar ratios of the reactants and hydrothermal reaction conditions, so the synthesis conditions were optimized to obtain pure zeolite NaA. Adsorption of nitrogen and carbon dioxide on the prepared zeolite NaA was also measured and analyzed. The results showed that zeolite NaA could be prepared with reasonable purity, it had physicochemical properties comparable with zeolite NaA made from other methods, and it had excellent gas adsorption properties, thus demonstrating that zeolite NaA could be prepared from nickel laterite residue.     

COUPLING PROCESS FOR Ti AND Si BETWEEN TITANIA SLAGS AND Cu MELTS AT 1500 ℃

ＣＯＵＰＬＩＮＧＰＲＯＣＥＳＳＦＯＲＴｉＡＮＤＳｉＢＥＴＷＥＥＮＴＩＴＡＮＩＡＳＬＡＧＳＡＮＤＣｕＭＥＬＴＳＡＴ１５００℃￥Ｘｕｅ，Ｘｉａｎｇｘｉｎ；Ｃｈｅ，Ｙｉｎｃｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＦｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，Ｎｏｒｔｈｅａ...     

摩天岭隧道左线涌水特点及综合治理方案

本文着重介绍摩天岭隧道左线进口段反坡施工,多次、多点发生大规模涌水的特点及其成因,并详细介绍了经过专家论证后制定采取的综合治理方案,为长大隧道灰岩地区反坡施工涌水处理提供了宝贵经验。     

c#．net调用matlab进行混合编程

本文结合一个小实例提出了几种混合编程的方法。     

Network traffic classification based on ensemble learning and co-training

Classification of network traffic is the essential step for many network researches. However,with the rapid evolution of Internet applications the effectiveness of the port-based or payload-based identifi-cation approaches has been greatly diminished in recent years. And many researchers begin to turn their attentions to an alternative machine learning based method. This paper presents a novel machine learning-based classification model,which combines ensemble learning paradigm with co-training tech-niques. Compared to previous approaches,most of which only employed single classifier,multiple clas-sifiers and semi-supervised learning are applied in our method and it mainly helps to overcome three shortcomings:limited flow accuracy rate,weak adaptability and huge demand of labeled training set. In this paper,statistical characteristics of IP flows are extracted from the packet level traces to establish the feature set,then the classification model is created and tested and the empirical results prove its feasibility and effectiveness.     

Effect of the fluctuation range of formation temperature on the preparation and superconductivity of Bi(Pb)2223 single-phase

Effects of the fluctuation range of formation temperature on preparation and superconducting properties of the Bi(Pb)2223 phase have been investigated in detail. Our results show that knowledge about the temperature distribution and fluctuation in the muffle furnace is necessary for preparation of the Bi(Pb)2223 single-phase. Single-phase samples from Bi_0.17Pb_0.3Sr₂Ca₂Cu₃O_y were obtained by a solid-state reaction in air at 835±5C. The best superconducting property of the as-prepared samples shows a one-step transition of a.c. susceptibility withT _c=109 K. Using this optimum sintering temperature and keeping the temperature fluctuation less than 5C, we have prepared pure Bi(Pb)2223 single-phase samples with good reproducibility.