是消毒
发表于 2025-3-21 17:25:39
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Endoscope
发表于 2025-3-21 22:50:51
Geschichte der Sprunggelenk-Endoprothetik,ction into a sol or a gel which on drying and densification give a solid material. This allows the production of multicomponent materials with high purity and potentially greater chemical homogeneity at lower temperature. The molecular design of alkoxide precursors allows a chemical control over con
catagen
发表于 2025-3-22 00:49:59
Geschichte der Sprunggelenk-Endoprothetik,ts are required, which should improve selectivity and utilize cheaper feedstocks. Zero waste processes are a clear goal of the chemical industries . Most “new” catalysts will be based on gradual improvements of known materials, but there is a demand for new catalysts with properties different fro
和音
发表于 2025-3-22 07:09:07
https://doi.org/10.1007/978-3-642-76361-8 oligomeric or colloidal systems can be used as precursors. The synthesis reaction is mainly based on a hydro- lysis and condensation reaction. Through the condensation reaction metal oxygen metal bonds are formed leading to a three-dimensional network. While in silica systems in the majority of the
预示
发表于 2025-3-22 09:47:36
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健谈
发表于 2025-3-22 13:45:44
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死亡
发表于 2025-3-22 20:23:55
https://doi.org/10.1007/978-3-642-76361-8or the production of fibers , coatings or reactive amorphous powders for sintering . Two main routes are used to prepare the preceramic polymers, either the sol-gel process to get oxo-polymers, or organo-metallic chemistry to prepare essentially silicon-based polymers such as polysilanes,
松软
发表于 2025-3-22 21:50:46
M. E. Safar,J. L. Cuche,B. M. Panniertz plates and polycrystalline alumina plates. The progress of pyrolysis chemistry can be easily monitored by FTIR on films supported on silicon, down to thicknesses as low as 10- 20 nm. The reactivity of PMS, or of polycarbosilane, with ammonia permits the homogeneous N-doping of these films and the
audiologist
发表于 2025-3-23 02:02:26
David S. Janowsky,Lewis L. Juddle polysilacarbosilanes (PSCS) or polysilasilazanes (PSSZ) which were easily transformed into polycarbosilanes (PCS) or polycarbosilazanes (PCSZ) respectively. This strategy provides an access to SiC and SiCN fibre precursors with variable Si/C/N ratios. The mechanisms involved in the preparation of
Cougar
发表于 2025-3-23 05:43:00
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