It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gau...It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.展开更多
Primary blast-induced traumatic brain injury （bTBI） has been observed at the boundary of brain tissue and cerebrospinal fluid （CSF）. Such injury can hardly be explained by using the theory of compressive wave prop...Primary blast-induced traumatic brain injury （bTBI） has been observed at the boundary of brain tissue and cerebrospinal fluid （CSF）. Such injury can hardly be explained by using the theory of compressive wave propagation, since both the solid and fluid materials have similar compressibility and thus the intracranial pressure （ICP） has a continuous distribution across the boundary. Since they have completely different shear properties, it is hypothesized the injury at the interface is caused by shear wave. In the present study, a preliminary combined numerical and theoretical analysis was conducted based on the theory of shear wave propagation]reflection. Simulation results show that higher lateral acceleration of brain tissue particles is concentrated in the boundary region. Based on this finding, a new biomechanical vector, termed as strain gradient, was suggested for primary bTBI. The subsequent simple theoretical analysis reveals that this parameter is proportional to the value of lateral acceleration. At the boundary of lateral ventricles, high spatial strain gradient implies that the brain tissue in this area （where neuron cells may be contained） undergo significantly different strains and large velocity discontinuity, which may result in mechanical damage of the neuron cells.展开更多
基金supported by National Natural Science Foundation of China under Grant No.10675019
文摘It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.
文摘Primary blast-induced traumatic brain injury （bTBI） has been observed at the boundary of brain tissue and cerebrospinal fluid （CSF）. Such injury can hardly be explained by using the theory of compressive wave propagation, since both the solid and fluid materials have similar compressibility and thus the intracranial pressure （ICP） has a continuous distribution across the boundary. Since they have completely different shear properties, it is hypothesized the injury at the interface is caused by shear wave. In the present study, a preliminary combined numerical and theoretical analysis was conducted based on the theory of shear wave propagation]reflection. Simulation results show that higher lateral acceleration of brain tissue particles is concentrated in the boundary region. Based on this finding, a new biomechanical vector, termed as strain gradient, was suggested for primary bTBI. The subsequent simple theoretical analysis reveals that this parameter is proportional to the value of lateral acceleration. At the boundary of lateral ventricles, high spatial strain gradient implies that the brain tissue in this area （where neuron cells may be contained） undergo significantly different strains and large velocity discontinuity, which may result in mechanical damage of the neuron cells.
