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Yb(NTf) was thought to be the best catalyst in the system of catalysts as La(NTf) 、Sm(NTf) and Yb(NTf) . Nevertheless, the tedious workup to recover the catalyst after reactions make it economically unusable and retrain it for laboratory use only.
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研究发现,在同类催化剂La(NTf) 、Sm(NTf) 和Yb(NTf) 中,Yb(NTf) 的催化活性最好,并且催化性能稳定,但反应后为了回收催化剂需要烦琐的后处理过程。 |
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Yet, the nature of Internet makes it only provide limited and unfixed bandwidth and unreliable service. So, the research and development of hierarchical video coding is becoming a hotspot, receiving more and more attention.
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然而,Internet的本质决定了其只能提供有限且不固定的网络传输带宽和尽最大努力交付(不可靠)的服务。 |
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Yield Advantage and Nitrogen Economy in the Intercropping System of Peanut with Rice Cultivated in Aerobic Soil
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旱作水稻/花生间作系统的氮素供应特征及产量优势 |
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Yoga,Men's Favour
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瑜伽让男人情有独钟 |
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Yongtai stratigraphic sequence is a complex pluton,which is composed of plutonic masses and 8 intrusives.
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永泰序列系复式深成岩体 ,由 个深成岩体、 8个侵入体组成。 |
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Yu The new record is Cyathus olla (Batch)Pers.
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Yu 和一新记录型——壶黑蛋巢布诺德变型Cyathus olla (Batch) Pers . |
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Yunnan-Guangdong ±800kV DC Transmission project is the first one in the world,the essentiality of the converter station power source went without saying.
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云广直流输电工程是世界上第一个±800kV等级的直流工程,终端换流站的站用电源重要性不言而喻。 |
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Z serrata n = x = 8 = m +sm;
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光叶榉n=x=8= m+sm； |
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Z-senegin IV and
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个化合物Z．Senegin Ⅳ 和 |
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Z. sinica Schneid,n=x=8=0m+8sm.
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大果榉(Z.sinica Schneid)的核型公式为n=x=8=0m+8sm。 |
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ZEOLITE-GAS SORPTION REFRIGERATION Ⅰ.THE SELECTION OF LIQUID-ZEOLITE MOLECULAR SIEVE COUPLES
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沸石分子筛吸附式制冷 Ⅰ.沸石分子筛体系的选择 |
