马鞭草中总黄酮的超声波辅助提取及其抗氧化活性研究

采用正交试验设计研究超声波辅助提取马马鞭草中总黄酮的工艺条件,并对马鞭草中黄酮类化合物的抗氧化活进行测定.结果表明,马鞭草中总黄酮的最佳超声提取工艺条件为乙醇溶液体积分数70%、固液比1∶40(g/mL)、超声功率500 W、超声辅助提取温度70℃条件下提取20 min,在此条件下提取率可达2.87%.影响马鞭草中总黄酮提取效果的主次因素为:固液比>超声波功率>提取温度>乙醇体积分数.马鞭草黄酮类化合物具有清除羟自由基、超氧阴离子自由基的作用,其清除效果在一定范围内随着黄酮类化合物质量浓度的增加而增强.     

芦丁对黑曲霉生长促进作用的研究

为探究芦丁对黑曲霉生长的促进作用.本实验采用了液体稀释法和干重法,通过测量在不同药品浓度环境下培养后的黑曲霉干重值,探究了不同浓度的芦丁对黑曲霉生长的促进效果.结果表明:当药品浓度小于14.55 mg/L时,芦丁对黑曲霉的促进效果随浓度的增大而增强,而当药品浓度超过14.55 mg/L时,促进效果随浓度的增大而减弱.芦丁对黑曲霉生长的最佳促进浓度为14.55 mg/L.     

On Jane Austin’s Ironic and Dramatic Effect of Narrative and Dialogues——Based on Stylistic Analyses of Pride and Prejudice

Jane Austin,a renowned British novelist,is a great master of language.She is skilled in depicting ironic,dramatic effect of narrative and dialogues.Pride and Prejudice is her masterpiece,whose unique artistic characteristics with dramatic effect attract generations of readers.To explore Austin’s dramatic effect and to further appreciate her amazing writing techniques,this paper conducts stylistic analyses of Pride and Prejudice.Firstly,Austin’s narrative techniques are explored stylistically from syntactic structure and schema refreshment perspective.Secondly,the dramatic dialogues between Bennet couple are analyzed from speech presentation and cooperative principles.     

磁化水的浅析

经实验测定证明,磁化水与普通水相比,密度稍有减小,溶氧量提高22％左右。研究发现,磁化水所具有的这些特性使得它的用途不断扩大．预计在未来的工业、农业、医学、生物学、建筑业等领域可产生良好的用途。     

以"农"为本做好"转移"大文章--基于农村劳动力转移的职业教育思考

职业教育要能在农村劳动力的转移中发挥积极作用，提升效能，就必须以理念为先导，树立“转移”新思维；必须以“农”为本，创新模式，完善制度，保障“转移”高效能。     

谈广告修辞中的语境意识

广告语言是一种修辞化的表达。修辞为广告的创作者和接受者双方创造最佳交际效果提供了可能性,而语境对广告的成功表达也具有深远意义。本文试图运用修辞学和语境理论的相关内容对其加以分析。     

Calculation of the Phase Equilibrium of CO_2–Hydrocarbon Binary Mixtures by PR-BM EOS and PR EOS

The phase equilibrium data of CO_2 –hydrocarbon binary mixtures are important for the design and operation of CO_2 flooding, coal liquefaction, and supercritical extraction processes. Numerous pieces of binary phase equilibrium data have been obtained. Thus, models for the accurate calculation of binary and multicomponent mixtures must be developed on the basis of existing data. In this work, 3578 vapor–liquid phase equilibrium data points for 10 CO_2 –hydrocarbon binary mixtures, including CO_2 –butane, CO_2 –pentane, CO_2 –isopentane, CO_2 –hexane, CO_2 –benzene, CO_2 –heptane, CO_2 –octane, CO_2 –nonane, CO_2 –decane, and CO_2 –undecane, were collected. The PR and PR-BM equations of state(EOS) in combination with relevant mixing rules were used to calculate the phase equilibrium data of the CO_2 –hydrocarbon binary mixtures. The binary interaction parameter k ij in the PR EOS was temperature independent, whereas parameters in the PR-BM EOS were functions of temperature. Thus, the phase equilibrium data and other thermodynamic properties of the binary and multicomponent mixtures at different temperatures and pressures can be calculated by using the parameters obtained in this work. The PR-BM EOS performed better than the PR EOS, and the average absolute deviations over the temperature range of 255.98–408.15 K calculated by the PR EOS and PR-BM EOS were less than 5.74% and 3.36%, respectively. The results calculated by the two EOS were compared with those calculated by other models, such as PPR78, PR + LCVM + UNIFAC, KIE + PR EOS + HV, and PSRK. The phase equilibrium data of CO_2 –butane–decane, CO_2 –hexane–decane, and CO_2 –octane–decane ternary mixtures were calculated by the two EOS. The average overall deviations for the CO_2 mole fractions calculated by the two EOS were less than 7.66%.     

论考试在高校人才培养中的作用

对考试的内涵做了全面阐述,并对目前高校考试存在的问题进行了分析;在此基础上,提出了充分发挥考试在高校人才培养中的各种作用。     

谈广告修辞中的语境意识

广告语言是一种修辞化的表达。修辞为广告的创作者和接受者双方创造最佳交际效果提供了可能性,而语境对广告的成功表达也具有深远意义。本文试图运用修辞学和语境理论的相关内容对其加以分析。     

加快陕西咨询业发展的对策探讨

就国内咨询业的发展现状进行了调研,在调研的基础上分析了陕西省咨询业目前存在的主要问题,并针对这些问题,提出了加快发展陕西咨询业的对策。