人肉搜索及其对竞争情报工作的启示

通过对人肉搜索概念、流程、特征的分析,认为人肉搜索是一个典型的信息挖掘动态过程,通过对信息的反复求证与辨伪,最终实现信息价值的增值,与竞争情报工作有相似之处.并从技术平台、信息搜索、信息挖掘的角度对人肉搜索与竞争情报进行比较分析,认为竞争情报工作要注重情报的全民共建,弱信号的识别与发现,有效互动与反馈机制的建立,并通过...     

试论《孔雀胆》的主题及段功的立场

郭沫若同志对其所著《孔雀胆》一剧的主题,先后曾有三次不同的解释。本文作者通过对《孔雀胆》这部剧作内容的具体分析,提出了自己的见解。关于《孔雀胆》中段功这个人物的评价问题,作者与黄侯兴同志持有不同的看法。     

Synthesis of Novel Ionic Liquid （[C4CNmim]^＋PF6^-） and Application to Preparation of Polyketone

N-valeronitrile-N’-methylimidazolium hexafluorophosphate ([C 4 CNmim]+ PF 6),as a novel ionic liquid with polar nitrile functional group,was prepared.The structure of the ionic liquid was characterized by using IR and 1 H NMR.As a medium,the ionic liquid plays an important role in copolymerization of carbon monoxide (CO) with styrene (St).Some synthetic conditions were determined,including the usage of ionic liquid,palladium composite catalyst and methanol,CO pressure,reaction time and reaction temperature.The influence of these factors on catalytic activity was analyzed.The results show that the catalytic activity has reached 1 724.1 gStCO/(gPd·h) and the catalyst could be reused 5 times under the optimal condition:composite catalyst 0.015 mmol,ionic liquid 3 mL,methanol 0.75 mL,CO pressure 2MPa,reaction time 2 h and reaction temperature 70℃.This CO/St copolymerization within [C 4 CNmim]+ PF 6 system could facilitate ionic liquids with efficient and economical applications to polymeric materials.     

基于EViews的我国农产品产量与相关投入的模型分析与预测检验

对我国198～2005年的农产品相关数据进行收集和分析,运用EＶiews软件进行计算,建立了农产品产量与相关投入的模型,并对模型进行了识别,最后对模型进行检验,验证其可行性.     

竞争情报与企业自主创新关系问题研究进展与方向

对近年来竞争情报与企业自主创新关系问题的研究进行概括和总结.我们的观点是,在这个问题上的研究演化进程是:由早期的竞争情报支持企业自主创新作用演进到探讨竞争情报是否是企业自主创新的内生变量层次.关于这方面的研究还仅限于技术竞争情报与企业自主创新关联性;市场竞争情报与企业自主创新关系等新的角度应当是继续研究这个问题的新方向.     

Synthesis and characterization of degraded gelatin grafted poly(ɛ-caprolactone) copolymers

Hydrophilic degraded gelatin was modified with hydrophobic poly(ε-caprolactone) (PCL) via a chemical grafting route.Firstly,PCL with one hydroxyl end group was prepared by the ring-opening polymerization of εcaprolactone (ε-CL) with tin (Ⅱ) 2-ethylhexanoate as catalyst and n-butyl alcohol as initiator.Secondly,the PCL reacted with isophorone diisocyanate (IPDI) to prepare PCL with isocyanate functional group (PCL-NCO).Hydroxylamine was used to degrade gelatin by the cleavage between asparagine and glycine residues of gelatin.PCL-NCO reacted with the hydroxyl/amino groups of degraded gelatin in a homogeneous system and yielded the PCL modified gelatin copolymers.The gelatin grafted PCL copolymers were measured by means of XRD,FTIR,DSC and 1 H NMR.The results confirmed the conjugation of PCL onto gelatin chains.The PCL modified gelatin can be used as biomaterials owing to their biocompatibility and biodegradation.     

价值共识视域下红色文化的教育探析

价值多元呼唤着价值共识,社会主义核心价值观是当今社会价值共识的重要体现。红色文化包含着社会主义核心价值观,是社会价值共识的基础。因此,我国必须大力推进红色文化教育,创新红色文化教育的目的、内容和路径,形成社会价值共识。     

新时期哲学的新变化

文章对新时期的哲学现象进行了分析，揭示了当今世界的巨大变化中，哲学在经济、政治、思想文化和人与自然的关系上所出现的十大新变化。使人们对当今的哲学有一个明晰的认识,从而也使人们对社会发展的趋势和人们的行为判断提供了一个现实的依据。     

Synthesis of novel electron donors and their application to propylene polymerization

A series of electron donors,including 1,1-cyclopentanecarboxylic acid diethyl ester (CPCADEE),1,1cyclopentanedimethanol acetic diester (CPDMAD),1,1-biethoxymethyl pentane (BEMP),2,2-diethyl diethylmalonate (DEDEM)and 2,2-diethyl-1,3-propanediol acetic diester (DEPDADE),were synthesized by diethyl malonate (DEM).The purities and structures of the above products were characterized by gas chromatography (GC) and gas chromatography-mass spectrometer (GC-MS),respectively.Furthermore,the possible optimal three-dimensional structures of these donors were simulated by means of Gaussian 03 and Chem 3D.Then these electron donors were coordinated with tetrachloro titanium (TiCl 4) and chloride magnesium (MgCl 2)to obtain the catalysts for the polymerization of propylene.The catalytic activities and properties of polypropylene are greatly improved by adding external donor(ED) when CPCADEE or DEPDADE is used as internal donor(ID).However,when BEMP was used as ID,the highest catalytic activity is obtained without adding ED,which can reduce production costs and simplify catalytic synthesis.The experiments indicate that BEMP has the shortest distance of oxygen atoms and the highest electronegativity.