共查询到19条相似文献,搜索用时 218 毫秒
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过氧乙酸是强氧化剂,具有广泛的用途,但其化学性质不稳定,易分解。我们通过过氧乙酸制备的条件选择试验,揭示了反应物料比、催化剂的用量、温度等对过氧乙酸产率的影响;通过稳定性试验,揭示了温度、稀释用水水质和某些稳定剂对过氧乙酸分解的影响。给出了过氧乙酸制备、贮存、稀释和使用的优化条件。 相似文献
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《粮食流通技术》2018,(18)
本实验以大豆油和棕榈油硬脂为原料,在单因素实验的基础上,通过L_9(3~4)正交试验设计,就影响人造奶油理化性质的油相配比、乳化剂、乳化时间和乳化温度4项因素进行了实验,确立了制备人造奶油的最优工艺条件。结果表明:大豆油和棕榈油硬脂比例为22.5∶27.5,大豆卵磷脂和丙二醇脂肪酸酯1∶1作为复配乳化剂,乳化温度60℃,乳化时间30min是最佳工艺条件,产品的打发倍数最高为1.41。气相色谱-质谱联用技术(GC-MS)对最佳工艺条件下制备的人造奶油脂肪酸的种类测定中发现,共检出14种脂肪酸,包括棕榈油酸甲酯、亚油酸甲酯和硬脂酸甲酯等,其中未检出反式脂肪酸。 相似文献
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通过对比实验,分别考察不同温度下的黄鳝冻藏过程对其品质的影响,从而优化制备条件,以期根据不同的使用要求,条件达到最适环境,以便控制条件达到其冻藏过程中的品质控制。 相似文献
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This research examines the impact of a luxury limited-edition offer in the face of core brand image dilution of a luxury brand. Through utilizing two millennial subgroups (college- vs. post-college age) as research participants in two studies, the findings suggest that in a brand dilution condition, the limited-edition product enhances consumers’ attitudes toward the luxury brand and that these effects are more pronounced for consumers with a higher self-presentation motive. We also find that college-age millennials are more strongly influenced by social influences than post-college age millennials. The implications for academic researchers and luxury brand retail managers are discussed. 相似文献
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针对基于经典假设检验理论的模糊度正确性评估算法的缺陷,提出了一种依据概率指标的LAMBDA(Least Square Ambiguity Decorrelation Adjustment)整周模糊度解算的正确性评估算法。该算法能够有效解决实时动态差分定位中模糊度解算值的可信度问题,降低系统完好性风险。通过对跑车实验中GPS差分定位数据的直接处理及引入多径误差后处理,该评估算法可以在置信水平为99.5%的条件下实时有效地评估模糊度解算值的正确性。 相似文献
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This paper reports a surprising reversal in the effect of advertising repetition over time. A field study shows higher annoyance with a more frequently advertised brand at the time of advertising, but greater preference for this same brand several weeks later. A longitudinal online experiment replicates the reversal in brand preference across four time points and tests an underlying mechanism for this reversal. It shows that initial annoyance with frequent ad repetition is highly susceptible to decay over time, whereas brand memory remains relatively stable. Through these two processes, brands with heavier advertising exposure move over time from lower preference to higher preference. Finally, a third experiment demonstrates a crucial condition for this reversal — product relevance at the time of consideration. This study shows that the reversal occurs only if at the later time the product category is relevant. We discuss the substantial implications of these findings for marketing theory and practice. 相似文献
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本文讨论了根据单脉冲雷达的特点及跟踪过程,运用模糊综合评判、模糊数据库、模糊控制的原理对单脉冲雷达系统的天线进行副瓣自动识别及跟踪的方法,经过仿地具试验初步验证该方法是可行的。 相似文献