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无机颜料合成的探究及社会调研 被引量:2
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作者 董晓放 林颢霆 +5 位作者 黄旭 彭华煜 夏一凡 范紫嫣 邢鑫 朱亚先 《大学化学》 CAS 2020年第6期31-38,共8页
无机颜料是多种日用品常用的着色剂,厦门大学本科生社会实践小组在查阅文献的基础上,在实验室小量合成了部分无机颜料,对合成方法进行了总结、讨论;同时进行了问卷调查,到相关企业进行了参观、学习。
关键词 无机颜料 合成 社会实践
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锌盐类成核剂对聚(1-丁烯)结晶性能的影响
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作者 崔晓鹏 董小芳 +3 位作者 李闯 顾高生 公衍峰 刘宾元 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第6期65-70,共6页
采用偏光显微镜、差示扫描量热仪和傅里叶变换红外光谱仪等方法研究了降冰片烯二羧酸锌(NED-Zn)和ZnO成核剂对聚(1-丁烯)结晶及晶型转变的影响,并用Jeziorny法分析了聚(1-丁烯)的非等温结晶过程。结果表明,2种成核剂的加入使得聚(1-丁烯... 采用偏光显微镜、差示扫描量热仪和傅里叶变换红外光谱仪等方法研究了降冰片烯二羧酸锌(NED-Zn)和ZnO成核剂对聚(1-丁烯)结晶及晶型转变的影响,并用Jeziorny法分析了聚(1-丁烯)的非等温结晶过程。结果表明,2种成核剂的加入使得聚(1-丁烯)的结晶温度升高、结晶速率加快,NED-Zn的成核效果优于ZnO。NED-Zn和ZnO成核剂的存在加快了PB的Ⅱ-Ⅰ晶型转变,使Ⅱ-Ⅰ半转变时间由39.2 h分别缩短至8.1 h和19.2 h。 展开更多
关键词 聚(1-丁烯) 成核剂 非等温结晶 Ⅱ-Ⅰ晶型转变
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Impact Fees and Real Estate Prices: Evidence from 35 Chinese Cities 被引量:2
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作者 xiaofang dong Shihe Fu Yufei Yuan 《Frontiers of Economics in China-Selected Publications from Chinese Universities》 2013年第2期207-219,共13页
Local governments often charge developers impact fees to finance local public goods. This has been practiced in Chinese cities for more than two decades; however, no empirical studies have tested the effect of impact ... Local governments often charge developers impact fees to finance local public goods. This has been practiced in Chinese cities for more than two decades; however, no empirical studies have tested the effect of impact fees on real estate prices. Using a panel data set for 35 large- and medium-sized cities from 1998 to 2008, we find that impact fees lead to a significant increase in real estate prices. For a given city, an increase in impact fees by one yuan leads to an increase of about 5 yuan in the price of newly-built housing; a 1% increase in impact fees leads to an increase of 5 percentage points in the housing price index and 7 percentage points in the land price index. 展开更多
关键词 impact fee real estate price local public finance
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