Nodulating (T202) and non-nodulating (T201) soybean isolines were hydroponically cultivated, then nitrate labeled with 13N or 15N, was added to the culture solution in order to investigate the nitrate absorption and transport in soybean. The accumulation pattern of the absorbed 13N in the first trifoliate was observed by positron emitting tracer imaging system (PETIS) as well as bioimaging analyzer system (BAS). The 15N abundance of each part was determined by emission sjectrometrv.Real time changes in two dimensional image of the radioactivity could be monitored by PETIS, besides the distribution 13N in whole plant could be observed by BAS. However quantitative data were hardly obtained by the 13N analysis. Stable isotope 15N is more reliable in the quantitative analysis in each part. Combing the data obtained by 15N and 13N tracer experiments, the absorption and translocation of N in plant should be more clearly figured out.
For the commercialization of solid oxide fuel cell (SOFC), in addition to the electrochemical reliability, it is also important to ensure the mechanical reliability of SOFC. Thus, the establishment of a suitable mechanical testing method under various temperatures and oxygen partial pressure conditions is a prerequisite for the development of reliable SOFCs. In this study, the in-situ mechanical testing method was developed in order to investigate mechanical property (i.e.: Elastic modulus and Fracture strength, Creep and Fatigue property) of solid oxide fuel cells components under high oxidizing/reducing environments. And mechanical property of gadolinium doped ceria (Gd 0.1 Ce 0.9 O 2-δ ; GDC) as oxygen non-stoichiometric compounds were evaluated in oxygen partial pressures under reducing conditions by developed In-situ mechanical testing machine. The experimental results of the investigation of elastic modulus and fracture strength on the SOFC components, the fracture stress of GDC were almost constant regardless of oxygen partial pressure, while elastic modulus decreased with decreasing oxygen partial pressure in reducing atmospheres. Mechanical properties of SOFC materials should be characterized by in-situ method because these results are different to quench method.
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