前驱

The relation of PAHs emission and Dioxin emission was discussed from theory and experimentation in this article, and it was indicated that PAHs could possibly synthesize Dioxin as an usher reagent.

本文还从理论和试验分别分析了多环芳烃排放和二恶英排放之间的关系，结果认为两种情况下多环芳烃都可能成为合成二恶英的前驱物。

P and 〓Si MAS NMR results show that both Si-OH groups on the pillars and P-OH groups on the layers react with the Ni〓 and form Si-ONi and P-O-Ni bondings, resulting in a more homogeneous dispersion of the NiO in the interlamellar region.

元素分析表明新方法中未焙烧的前驱体的层间存在大量的胺基，可能与镍产生配合作用，有利于金属离子进入层间。

The single-source ceramic precursor is synthesized by dimethylsulphide borane and dichloromethylvinylsilane and then pyrolyzed. The problem of this path, the elimination of by-product, NH4Cl, is discussed.

本文以甲基乙烯基二氯硅烷和二甲硫醚硼烷为原料，采用聚合物前驱体高温裂解的方法制备了SiBCN陶瓷，并分析了该路径的难点，即副产物的分离。

The recent progress in molecular design and synthesis of polyborosilazane precurosors for SiBCN ceramics is reviewed.Especially the borazine modified polyborosilazane,monofunctional borane modified polyborosilazane on side chai...

本文分4个方面，即基于硼吖嗪的聚硼硅氮烷、侧基含有环硼氮烷或单硼烷的聚硼硅氮烷、基于多官能硼烷构筑的聚硅氮烷和含硼聚硅基碳化二亚胺，从聚硼硅氮烷分子结构设计、改性、合成及在多维尺寸材料中初步应用的角度综述了该领域国内外研究的新进展，指出了聚硼硅氮烷陶瓷前驱体设计合成研究发展中值得关注的新方向。

While Ni(NO3)2 and Mg(NO3)2 were used as ushers of the catalyzers, carbon nanotubes were prepared by catalyst-assisted CVD in different ratios of gaseous mixture, which were analyzed with TEM, SEM and Raman spectrograph.

将Ni(NO3)2-Mg(NO3)2体系作为催化剂前驱体，在不同气源比例下用CVD催化裂解法制备纳米碳管，用SEM、TEM和喇曼光谱对其进行了表征和分析，制备出完整性好的纳米碳管。

While Ni(NO3)2 and Mg(NO3)2 were used as ushers of the catalyzers, carbon nanotubes were prepared by catalyst-assisted CVD in different ratios of gaseous mixture, which were analyzed with TEM, SEM and Raman spectrograph. The results show that carbon nanotubes prepared in CH4/H2=250/50=5/1 are pure and intact.

将Ni(NO3)2-Mg(NO3)2体系作为催化剂前驱体，在不同气源比例下用CVD催化裂解法制备纳米碳管，用SEM、TEM和喇曼光谱对其进行了表征和分析，制备出完整性好的纳米碳管。

The results showed that the hollow nanospheres were 65 nm in sizes, which was smaller than that of the original CeO2 nanospheres. The Ce(subscript 1-x)TiO2 hollow nanospheres were face-centered cubic structure as the same as CeO2 nanospheres.

结果表明，Ce(下标 1-x)TiO2纳米空心球的粒径为65 nm，小于初始状态的CeO2纳米球，并且Ce(下标 1-x)TiO2纳米空心球的结构与前驱体CeO2晶体结构相同，均为面心立方结构。

Bone marrow derived fibrocytes migrate to the asthmatic airway from blood circulation acts as a progenitor cell of fibroblast and myofibrolast.

近来研究也发现，骨髓生成的纤维球扮演了纤维母细胞或肌纤维母细胞的前驱细胞角色，在特定细胞激素的引导下，由血流循环中移行至发炎的气道。

Among rearrangements of folksongs which were done in this period were li Huanzhi's The East Is Red, Mai Ding's Please Stay, Guest From afar

在民歌改编方面，李焕之的《东方红》、麦丁的《远方的客人请你留下来》、李大钊是中国革命的前驱。

In particular, a process for the synthesis of nanopowders of various materials such as metals, alloys, ceramics and composites by induction plasma technology, using organometallic compounds, chlorides, bromides, fluorides, iodides, nitrites, nitrates, oxalates and carbonates as precursors is disclosed.

具体地，公开了一种通过感应等离子体技术合成各种材料，例如金属、合金、陶瓷和复合物的纳米粉末的工艺，使用有机金属化合物、氯化物、溴化物、氟化物、碘化物、亚硝酸盐、硝酸盐、草酸盐、碳酸盐作为前驱体。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。