Micro computed tomography (Micro-CT) was applied to obtain three-dimensional images of the microstructure of cement paste (water-to-cement mass ratio of 0.5) at different ages. By using the Amira software, component p...Micro computed tomography (Micro-CT) was applied to obtain three-dimensional images of the microstructure of cement paste (water-to-cement mass ratio of 0.5) at different ages. By using the Amira software, component phases of the cement paste such as pores, hydration products, and unhydrated clinker particles were segmented from each other based on their 3D image grey levels; their relative contents were also calculated with the software, and the data are 61.2%, 0% and 38.8% at the beginning of hydration and 11.8%, 78.5% and 9.7% at 28 d age, respectively. The hydration degree of cement paste at different ages was compared with the experimental data acquired by loss on ignition (LOI) tests. The results show that the calculated and measured data reasonably agree with each other, which indicates that micro-CT is a useful and reliable approach to characterize the micro structure evolution of hydrating cement paste.展开更多
Objective： To investigate the therapeutic effect of primary refractory trigeminal neuralgia. Methods： Twenty-eight cases of primary trigeminal neuralgia were treated by point penetrating injection plus ear pressing,...Objective： To investigate the therapeutic effect of primary refractory trigeminal neuralgia. Methods： Twenty-eight cases of primary trigeminal neuralgia were treated by point penetrating injection plus ear pressing, controlled by 28 cases treated only by acupuncture, Results： The total effective rate was 96,43% in observation group and 78.57% in control group. There wasa significant difference in the total effective rate between the two groups （P〈0.05）. Results： Point penetrating injection plus ear pressing is the effective method in treating primary trigeminal neuralgia.展开更多
基金Project(2009CB623201) supported by the National Basic Research Program of ChinaProjects(50902106, 51272193) supported by the National Natural Science Foundation of ChinaProject(NCET-10-0660) supported by New Century Excellent Talents in Universities of China
文摘Micro computed tomography (Micro-CT) was applied to obtain three-dimensional images of the microstructure of cement paste (water-to-cement mass ratio of 0.5) at different ages. By using the Amira software, component phases of the cement paste such as pores, hydration products, and unhydrated clinker particles were segmented from each other based on their 3D image grey levels; their relative contents were also calculated with the software, and the data are 61.2%, 0% and 38.8% at the beginning of hydration and 11.8%, 78.5% and 9.7% at 28 d age, respectively. The hydration degree of cement paste at different ages was compared with the experimental data acquired by loss on ignition (LOI) tests. The results show that the calculated and measured data reasonably agree with each other, which indicates that micro-CT is a useful and reliable approach to characterize the micro structure evolution of hydrating cement paste.
文摘Objective： To investigate the therapeutic effect of primary refractory trigeminal neuralgia. Methods： Twenty-eight cases of primary trigeminal neuralgia were treated by point penetrating injection plus ear pressing, controlled by 28 cases treated only by acupuncture, Results： The total effective rate was 96,43% in observation group and 78.57% in control group. There wasa significant difference in the total effective rate between the two groups （P〈0.05）. Results： Point penetrating injection plus ear pressing is the effective method in treating primary trigeminal neuralgia.
