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排序方式: 共有199条查询结果,搜索用时 15 毫秒
81.
Guoping Bei Mirza Mačković Erdmann Spiecker Peter Greil 《International Journal of Applied Ceramic Technology》2019,16(5):1744-1751
The oxidation-induced crack healing of an Al2O3 composite loaded with various volume fractions of Ti2Al0.5Sn0.5C repair filler particles was investigated by annealing in air at a relatively low temperature of 700°C. After annealing a composite with 20 vol.% repair fillers (with a particle size of ~5.6 µm) for 48 hours, artificial indentation cracks prepared on the surface, as well as pores near the surface, were completely healed by filling with condensed oxidation products. Additionally, minor fraction of metallic Sn was detected. A complementary study by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy revealed that nano-sized oxidation products (SnO2, TiO2, and α-Al2O3 phase) were formed as major crack-filling species. After healing, the strength recovery of the Al2O3 composites was significantly improved in the composites loaded with more than 10 vol.% repair fillers and achieved 107% at 700 for 48 hours. 相似文献
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83.
In this article, the reasons for discoloration of hydrotreated naphthenic rubber base oil under high temperature were studied in detail. In order to define compositional factors associated with the color deterioration, firstly liquid-solid chromatography was used to separate hydrotreated naphthenic rubber base oil into five different fractions, i.e., saturates, monoaromatics, diaromatics, polyaromatics, and polars. Then color change of each fraction was evaluated under high temperature. The results of the test indicate that polyaromatics and polars are the main precursor of color and deposits, respectively, and the composition of polyaromatics was characterized by elemental analysis, gas chromatography mass spectrometry (GC-MS) and atmospheric pressure chemical ionization mass spectrometer (APCI/MS). 相似文献
84.
Mechanism of Surface White Discoloration of Peeled (Minimally Processed) Carrots During Storage 总被引:1,自引:0,他引:1
LUIS CISNEROS-ZEVALLOS MIKAL E. SALTVEIT JOHN M. KROCHTA 《Journal of food science》1995,60(2):320-323
A proposed mechanism of white discoloration development on peeled carrots included both physical and physiological responses to wounding. The physical response is a color change due to reversible surface dehydration. This study was performed at 2.5 and 10°C using a mode1 system controlling relative humidity, at 33, 75 or 98%, and a commercial system with low-density polyethylene (LDPE) plastic film bags. The rate of surface discoloration increased with decreasing RH. When excess surface moisture was left on peeled carrots, rates of white development decreased sharply at all RH compared with a dewetted control. The same effects were observed on peeled carrots stored in LDPE bags. Carrots partially regained their original color when water-dipped, due to reversal of the physical response component. 相似文献
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催化褪色动力学光度法测定食品中微量碘的研究 总被引:1,自引:0,他引:1
研究了在3.0mol/L的硫酸介质中,溴化钾催化碘酸钠氧化偶氮胂M褪色反应的适宜条件与影响因素,建立了催化动力学褪色光度法测定痕量碘的新方法。I-浓度在0.010~2.00μg/25ml范围内与lg(Ao/A) 呈线性关系。其λmax=540nm,Sandell灵敏度为3.20μg/cm2,RSD%为1.70%~4.40%,CV%为98.20%~108.20%。该法用于环境样品、生物材料、食品等实际样品中I-的测定,多数常见离子无干扰,方法简快,选择性好,结果满意可靠。 相似文献
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从变色服装的变色原理出发,介绍了不同类型的变色服装,分析其在不同领域的应用,从中折射出国内外有关变色服装的研究差距,旨在全方位展现变色服装的研究和运用现状,以期对中国变色服装行业有所启发,且简要分析了变色服装趣味化、安全化、服务化、智能化的发展方向。 相似文献
89.
2,2,6,6-四甲基-4-哌啶醇久置易变色,通过GC-MS联用技术对产品变色问题产生的根本原因进行分析,并以硼氢化钠为还原剂,通过二次还原的方法处理变色哌啶醇以达到更好效果。 相似文献
90.