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1)  BaCe_(0.95)Y_(0.05)O_(3-δ)
BaCe0.95Y0.05O3-δ
2)  deta-sigma
Δ-∑
3)  oxygen-deficient nickel ferrite
NiFe2O4-δ
1.
5 g,the optimum reduction condition for the preparation of oxygen-deficient nickel ferrite,NiFe2O4-δ,reduced by H2 was as follows: reduction temperature was 320 ℃,H2 flow rate was 40 mL/min and reduction time was 3 h.
采用柠檬酸络合法制备NiFe2O4,运用XRD、DTA-TG等手段对其结构进行表征,并探讨还原条件对NiFe2O4-δ的结构稳定性及其催化分解CO2成C反应活性的影响。
4)  δ phase
δ相
1.
The precipitation behavior of δ phase, γ ′′ and γ ′ phase was studied through adjusting precipitated strengthening elements Al, Ti and solution strengthening element W in 718 alloy.
通过对718合金中沉淀强化元素Al,Ti以及固溶强化元素W含量的调整,研究了δ相形成规律及合金中γ′′/γ′复合析出组织的形成条件,同时分析了合金的微观组织与力学性能之间的关系。
2.
It is shown that the addition of Ti and Al can evidently decrease the oxidation rates of alloy,and both Nb-15Ti-11Al and Nb-30Ti-15Al(β+δ) show superior oxidation resistance than Nb-35Ti-6Al(β) which may be attributed to the decreased solubility and diffusion of oxygen in δ phase.
研究表明,元素Ti和Al的加入能有效改善合金的抗氧化性能,合金中δ相的存在降低了氧的溶解度,同时抑制氧的扩散,因而两相合金Nb-15Ti-11Al和Nb-30Ti-15Al(β+δ相)抗氧化性能优于单相合金Nb-35Ti-6Al(β相)。
5)  La_(0.8)Sr_(0.2)MnO_(3-δ)
La0.8Sr0.2MnO3-δ
6)  δ' phase
δ'相
1.
A small angle X-ray scattering (SAXS) technique was used to characterize the interfaces between the δ′ phase and matrix in 2091 Al-Li alloy aged at 150 ℃ for different times.
采用小角X射线散射技术对2091Al-Li合金时效过程中δ′相的生长机制和相界特性进行了研究。
2.
The formation and the coarse of δ′ phase in 1420 Al-Li alloy treated by retrogression and reaging were investigated by means of small angle X-ray scattering (SAXS) technique.
采用小角 X射线散射技术研究了回归再回火处理 1 42 0铝锂合金 δ′相的形成和粗化 。
3.
Small angle X ray scattering (SAXS) technique was used to research the interfacial characteristic between δ′ phase and matrix in 8090 Al Li alloy aged at 160 ℃ for several times.
采用小角X射线散射技术研究8090Al-Li合金回火析出δ′相的相界特征。
补充资料:2-Acetyl-5-hydroxy-3-oxo-4-hexenoic acid δ-lactone
分子式:C8H8O4
分子量:168.15
CAS号:520-45-6

性质:无色结晶,无臭,无味。熔点109-111℃,沸点269.9℃132-133℃(0.67kPa)。溶解度(W/W,25℃);丙酮22%,苯18%,甲醇5%,四氯化碳3%,乙醇3%,水<0.1%。

制备方法:常用的方法是乙酰乙酸乙酯脱醇缩合法和双乙烯缩合法。双乙烯酮法合成工艺具有成本低,得率高的优点。

用途:脱氢乙酸是有机合成中间体、增韧剂,也是广谱性的食品防腐剂。自1940年发现其有抗菌性以来,先后得到许多国家的重视,并陆续得到用于食品防腐的允许。脱氢乙酸作为食品添加剂,允许用于干酪、黄油、人造奶油、清凉饮料、发酵乳及乳酸菌的饮料、豆酱、馅类等。作为食品添加剂一般使用脱氢乙酸钠。该品还用于日用化妆品、纤维制品、医药(如癣症的治疗),以及齿科材料的防腐。

说明:补充资料仅用于学习参考,请勿用于其它任何用途。
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