A special method based on the local equilibrium principle has been introduced in the research of the phase diagram of Mn-MnO system.With this method,the problems of volatilization of Mn and the corrosion of Mn and MnO...A special method based on the local equilibrium principle has been introduced in the research of the phase diagram of Mn-MnO system.With this method,the problems of volatilization of Mn and the corrosion of Mn and MnO to refractory materials were prevented efficiently.The solubility of oxygen in Mn and the composition of the interface between MnO and Mn were determined.Partial phase diagram of Mn-MnO system were constructed according to pres- ent experimental results.展开更多
The Mg-Al-Zn-Y-Ce system is one of the key systems for designing high-strength Mg alloys. The purpose of the present article is to develop a thermodynamic database for the Mg-Al-Zn-Y-Ce multicomponent system to design...The Mg-Al-Zn-Y-Ce system is one of the key systems for designing high-strength Mg alloys. The purpose of the present article is to develop a thermodynamic database for the Mg-Al-Zn-Y-Ce multicomponent system to design Mg alloys using the calculation of phase diagrams （CALPHAD） method, where the Gibbs energies of solution phases such as liquid, fcc, bcc, and hcp phases were described by the subregular solution model, whereas those of all the compounds were described by the sublattice model. The thermodynamic parameters describing Gibbs energies of the different phases in this database were evaluated by fitting the experimental data for phase equilibria and thermodynamic properties. On the basis of this database, a lot of information concerning stable and metastable phase equilibria of isothermal and vertical sections, molar fractions of constituent phases, the liquidus projection, etc., can be predicted. This database is expected to play an important role in the design of Mg alloys.展开更多
目的制备盐酸奈必洛尔(hydrochloride,NBH)自微乳化给药系统(self-microemulsifying drug delivery system,SMEDDS),并进行体外评价。方法通过测定NBH在不同油相、表面活性剂和助表面活性剂中的溶解度以及运用伪三元相图对空白自微乳化...目的制备盐酸奈必洛尔(hydrochloride,NBH)自微乳化给药系统(self-microemulsifying drug delivery system,SMEDDS),并进行体外评价。方法通过测定NBH在不同油相、表面活性剂和助表面活性剂中的溶解度以及运用伪三元相图对空白自微乳化的处方组成进行确定,使用星点设计-效应面法对处方用量进行筛选和优化,并加入过量NBH原料药对该处方的载药量进行确定。结果NBH-SMEDDS处方组成为中链甘油三酸酯∶辛酸癸酸聚乙二醇甘油酯∶二乙二醇单乙基醚=20∶48∶32,该处方的载药量为20.05 mg,该处方的粒径、自乳化时间、粒径分布范围符合预测值,溶出度试验显示,NBH-SMEDDS在介质中溶出度的整体趋势对比NBH粉末和NBH普通片有一定的提升,在1,2,3月的加速条件下稳定性良好。结论SMEDDS可用于提高NBH的体外溶出度,且稳定性良好。展开更多
文摘A special method based on the local equilibrium principle has been introduced in the research of the phase diagram of Mn-MnO system.With this method,the problems of volatilization of Mn and the corrosion of Mn and MnO to refractory materials were prevented efficiently.The solubility of oxygen in Mn and the composition of the interface between MnO and Mn were determined.Partial phase diagram of Mn-MnO system were constructed according to pres- ent experimental results.
基金This study was financially supported by the National Natural Science Foundation of China and Chongqing Science and Technology Commission.
文摘The Mg-Al-Zn-Y-Ce system is one of the key systems for designing high-strength Mg alloys. The purpose of the present article is to develop a thermodynamic database for the Mg-Al-Zn-Y-Ce multicomponent system to design Mg alloys using the calculation of phase diagrams （CALPHAD） method, where the Gibbs energies of solution phases such as liquid, fcc, bcc, and hcp phases were described by the subregular solution model, whereas those of all the compounds were described by the sublattice model. The thermodynamic parameters describing Gibbs energies of the different phases in this database were evaluated by fitting the experimental data for phase equilibria and thermodynamic properties. On the basis of this database, a lot of information concerning stable and metastable phase equilibria of isothermal and vertical sections, molar fractions of constituent phases, the liquidus projection, etc., can be predicted. This database is expected to play an important role in the design of Mg alloys.
文摘目的制备盐酸奈必洛尔(hydrochloride,NBH)自微乳化给药系统(self-microemulsifying drug delivery system,SMEDDS),并进行体外评价。方法通过测定NBH在不同油相、表面活性剂和助表面活性剂中的溶解度以及运用伪三元相图对空白自微乳化的处方组成进行确定,使用星点设计-效应面法对处方用量进行筛选和优化,并加入过量NBH原料药对该处方的载药量进行确定。结果NBH-SMEDDS处方组成为中链甘油三酸酯∶辛酸癸酸聚乙二醇甘油酯∶二乙二醇单乙基醚=20∶48∶32,该处方的载药量为20.05 mg,该处方的粒径、自乳化时间、粒径分布范围符合预测值,溶出度试验显示,NBH-SMEDDS在介质中溶出度的整体趋势对比NBH粉末和NBH普通片有一定的提升,在1,2,3月的加速条件下稳定性良好。结论SMEDDS可用于提高NBH的体外溶出度,且稳定性良好。
