Their properties have been investigated by using scanning electronic microscopy ( sem ) , differential scanning calorimetry ( dsc ) , x - ray diffraction ( xrd ) , thermogravimetry - differential thermal analysis ( tg - dta ) , infrared spectroscopic analysis ( ir ) , and gas chromatography ( gc ) , etc . the effects of the mulser ' s stirring rate and the emulsifier concentration on the properties of encapsulated pcms have been systematically studied , and nanopcms have been obtained by increasing the stirring rate or the emulsifier concentration . the influences of different nucleating agents on micropcm performances have also been investigated in detail to search for a suitable nucleating agent to prevent micropcms from super - cooling 首先，系统研究了乳化机转速和乳化剂浓度对胶囊性能的影响，并通过提高转速或乳化剂浓度获得相变材料纳胶囊；其次，系统研究了不同成核剂对微胶囊性能的影响，找到合适的成核剂抑制了相变材料微胶囊的过冷现象；再次，详细研究了环己烷对胶囊性能的影响，并通过添加适量环己烷提高了相变材料微胶囊及纳胶囊的耐热温度。
In this paper , the nacre of hyriopsis cumingii ( lea ) which is one of the main freshwater pearl - forming mollusk in china is studied emphatically , as compared with the nacre of three species of saltwater pearl - forming mollusks , pinctada martensii ( dunker ) , pinctada maxima ( jameson , and peteria penguin ( roding ) . the basic characteristics of nacreous and prismatic layers are understood by powder x - ray diffraction analysis , trace elements analysis , amino acid composition of protein and differential thermal analysis 本文以我国主要育珠蚌淡水三角帆蚌贝壳珍珠层为重点研究对象，以三种海水育珠贝马氏珍珠贝、企鹅珍珠贝及大珠母贝贝壳珍珠层为对比研究对象，首先通过粉末x -射线衍射、微量元素分析、蛋白质氨基酸分析及差热分析对珍珠层及其与之密切共生的棱柱层的基本特征进行了初步研究。
Combing with d _ ( 33 ) test and density measure , the composition , structure and properties of the pmn - pt ceramics have been studied systematically by means of macro - quantity chemical analysis , x - ray diffraction ( xrd ) , scanning electron microscope ( sem ) , differential thermal analysis ( dta ) and thermogravimetric analysis ( tga ) 利用常量化学分析法、 xrd 、 sem和dta tga等分析测试技术，结合pmn - pt陶瓷密度和压电等性能的测试，对材料组分、结构与性能特征进行系统研究。
