通过研究由SPIO(superparamagnetic iron oxide)和USPIO(ultrafine SPIO)引起质子的横向弛豫,发现SPIO体系中质子横向弛豫时间(T2)对检测等待时间有很强的依赖性。实验证明只有把等待时间外推到0所得到的T2_0才能够用于T2与浓度间关系...通过研究由SPIO(superparamagnetic iron oxide)和USPIO(ultrafine SPIO)引起质子的横向弛豫,发现SPIO体系中质子横向弛豫时间(T2)对检测等待时间有很强的依赖性。实验证明只有把等待时间外推到0所得到的T2_0才能够用于T2与浓度间关系的研究。最后分析了造成这一现象的原因。展开更多
The temperature dependences of the dynamic-elastic and viscous susceptibilities have been measured for Au83Fe17, after cold-rolling. It is found that cold-rolling reduces the Curie temperature and raises the spin-free...The temperature dependences of the dynamic-elastic and viscous susceptibilities have been measured for Au83Fe17, after cold-rolling. It is found that cold-rolling reduces the Curie temperature and raises the spin-freezing temperature remarkably. These results can be explained on the basis of the precipitation medal proposed by Borg and Violet.展开更多
It has been recently discovered that the sintered Y1Ba2Cu3O7-x, compound is an architypical high critical temperature （Tc） superconductor with a perovskite structure. We have measured its complex AC susceptibility a...It has been recently discovered that the sintered Y1Ba2Cu3O7-x, compound is an architypical high critical temperature （Tc） superconductor with a perovskite structure. We have measured its complex AC susceptibility as a function of temperature and found that below Tc there are two distinguishable superconducting 'phases'. In this note we report our experimental results.展开更多
I. INTRODUCTION An important parameter of the Bauschinger effect is the back stress which exhibits crucial influence on the hydrogen brittleness, size stability, elastic relaxation, fatigue, directionality of mechanic...I. INTRODUCTION An important parameter of the Bauschinger effect is the back stress which exhibits crucial influence on the hydrogen brittleness, size stability, elastic relaxation, fatigue, directionality of mechanical property and so on of materials after prestrain. So the study on the back stress is of great importance in practice. However, no report is known to展开更多
Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lowe...Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lower than those for pure tension, a phenomenon much like the Bauschinger effect in steels. In this work we will study the influence展开更多
文摘通过研究由SPIO(superparamagnetic iron oxide)和USPIO(ultrafine SPIO)引起质子的横向弛豫,发现SPIO体系中质子横向弛豫时间(T2)对检测等待时间有很强的依赖性。实验证明只有把等待时间外推到0所得到的T2_0才能够用于T2与浓度间关系的研究。最后分析了造成这一现象的原因。
文摘The temperature dependences of the dynamic-elastic and viscous susceptibilities have been measured for Au83Fe17, after cold-rolling. It is found that cold-rolling reduces the Curie temperature and raises the spin-freezing temperature remarkably. These results can be explained on the basis of the precipitation medal proposed by Borg and Violet.
文摘It has been recently discovered that the sintered Y1Ba2Cu3O7-x, compound is an architypical high critical temperature （Tc） superconductor with a perovskite structure. We have measured its complex AC susceptibility as a function of temperature and found that below Tc there are two distinguishable superconducting 'phases'. In this note we report our experimental results.
文摘I. INTRODUCTION An important parameter of the Bauschinger effect is the back stress which exhibits crucial influence on the hydrogen brittleness, size stability, elastic relaxation, fatigue, directionality of mechanical property and so on of materials after prestrain. So the study on the back stress is of great importance in practice. However, no report is known to
文摘Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lower than those for pure tension, a phenomenon much like the Bauschinger effect in steels. In this work we will study the influence
