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1)  fusion trend
"聚"变趋势
2)  clustering tendency
聚类趋势
1.
Research for clustering tendency
聚类趋势问题的研究综述
3)  evolution tendency
演变趋势
1.
Water environment condition and evolution tendency analysis of the main lakes and reservoirs in Nanjing;
南京市主要湖库水环境现状与演变趋势分析
2.
The main problems and the evolution tendency of the agricultural ecological environment in the Sichuan area are analyzed and some measures are presented.
该文全面分析评价了四川省农业生态环境的主要问题和演变趋势,提出了四川省农业生态环境恢复与重建的对策措施。
3.
In terms of the demand theory,it made a further prediction of the evolution tendency of arable land use in each county under the driving forces.
在此基础上,对驱动因子的变化趋势进行了预测,并根据需求理论,对各县耕地利用在驱动力系统的作用下演变趋势加以预测。
4)  evolution trend
演变趋势
1.
Comparison and analysis of remote sensing data are conducive to understanding the evolution trend of the Lake and giving suggestions for restoration and.
利用不同时期成像的遥感资料对比分析巢湖演变趋势以及巢湖恢复治理建议。
2.
The general situation of Jinghong waterway is introduced,and the cumulated rate of sand transport and the dominant discharge for channel formation are calculated,and the causes of the formation of Jinghong shallow as well as it s evolution trend are analyzed,and the regulation principles for relevant readers are put forword.
简述景洪大砂坝水道的概况并计算出输砂量和造床流量,分析景洪大砂坝浅滩的成因和演变趋势,并提出相应的整治原则供相关人员参考。
3.
This paper forecasts the river evolution trend, through analyzing the history and recently river channel evolution of Ma anshan reach located the principal river of yangtse river, An hui province.
 本文通过对安徽省长江干流马鞍山河段的历史和近期河道演变分析,对未来的演变趋势进行了预估。
5)  change trend
变化趋势
1.
Current situation of air environmental quality and change trend analysis in Sanmenxia city;
三门峡市环境空气质量现状及变化趋势分析
2.
The content and change trend of metal Hgin soils -vegetables in Guangzhou;
广州市蔬菜地土壤-蔬菜中重金属Hg的含量及变化趋势
3.
Precipitation characteristic and analysis on the change trend in Tonglu County of Zhejiang Province;
浙江省桐庐县降水特征及变化趋势分析
6)  variation trend
变化趋势
1.
Analysis on the content and variation trend of heavy metal in themarine organisms in Daya Bay;
大亚湾海洋生物体重金属含量与变化趋势分析
2.
Study on the Mortality Rate and Variation Trend from 1991 to 2005 of Huantai Residents;
桓台县居民死亡流行水平和变化趋势研究
3.
Based on the data of chemical oxygen demand(COD)in Bohai Bay during 1995—2005t,he variation trend of the COD in different seasons(May,Aug and Oct)and years was analyzed.
基于1995年到2005年渤海湾化学耗氧量(COD)的监测数据序列,研究了渤海湾10年来COD的季节(5月、8月及10月)及年际间的变化趋势,运用极值理论研究了COD的极值分布规律,计算了COD分别超过不同污染水平的风险概率。
补充资料:聚[3,3-双(氟甲基)氧杂环丁烷]
分子式:
CAS号:

性质: 以氟原子取代氯的卤化聚醚树脂类似物。同氯化聚醚一样,经拉伸和极化处理的该类树脂也表现出压电和热电性质。由于分子中碳氟键的极性比碳氯键大,预期在热电性质方面具有优越性质,而且氟取代物的碳氟键能高,其化学稳定性要好于氯取代类似物。聚[3,3-双(氟甲基)氧杂环丁烷]的合成与聚[3,3-双(氯甲基)氧杂环丁烷]的制备类似,首先合成3,3-双(氟甲基)氧杂环丁烷,然后利用开环聚合反应得到该聚合物。

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