The solitary tract nucleus of the medulla with its limited watershed vascular capacity may occasionally be the focus of transient ischemia caused by the increased metabolic demands associated with frequent and intense...The solitary tract nucleus of the medulla with its limited watershed vascular capacity may occasionally be the focus of transient ischemia caused by the increased metabolic demands associated with frequent and intense neuronal stimulation from other organs and other parts of the brain. Case reports have suggested that these ischemic changes may sometimes result in the initiation of intense autonomic discharges, which can occasionally be fatal. Therapeutic interventions for the medulla oblongata are hamperedby its limited accessibility. Systemically administered pharmaceuticals may have some usefulness in future years. Previous experience with vagus nerve stimulation in the treatment of epilepsy suggests that it may have some usefulness in stabilizing medullary autonomic discharges. Computerized electronic stimulation of other cranial nerves may be helpful as well, especially the chorda tympani nerve, and may be most easily accomplished from implanted dental appliances, especially molar modules, transmitting signals via secondary transmitters procedurally placed on cranial nerves. Future technology may enable wireless signaling from the implanted dental appliance to the secondary transmitter placed at the nerve site. By the year 2050 subspecialists in medullary neurology and brain dentistry may use computerized electronic stimulation of cranial nerves to prevent sudden unexpected death and treat "chest pain from the brain".展开更多
振荡和波动是出现在太阳黑子内的一种普遍现象,精确测定它的周期对于理解太阳黑子演化有着重要意义.2013年03月13日抚仙湖太阳观测站(Fuxian Solar Observatory,FSO)的一米新真空红外太阳望远镜(The 1m New Vacuum Solar Telescope,NVST...振荡和波动是出现在太阳黑子内的一种普遍现象,精确测定它的周期对于理解太阳黑子演化有着重要意义.2013年03月13日抚仙湖太阳观测站(Fuxian Solar Observatory,FSO)的一米新真空红外太阳望远镜(The 1m New Vacuum Solar Telescope,NVST)利用谱线Hα(6 562.80)对太阳活动区AR 11692进行了连续的观测,获得了一系列具有高时间分辨率的太阳活动区演化图.利用快速傅里叶变换法,分析了活动区内不同样本点的亮度强度随时间变化规律,测定了这些样本点的振荡周期.结果显示:本影内的振荡周期为165s,而在半影区域内周期为283s,两者近似为倍数关系.展开更多
文摘The solitary tract nucleus of the medulla with its limited watershed vascular capacity may occasionally be the focus of transient ischemia caused by the increased metabolic demands associated with frequent and intense neuronal stimulation from other organs and other parts of the brain. Case reports have suggested that these ischemic changes may sometimes result in the initiation of intense autonomic discharges, which can occasionally be fatal. Therapeutic interventions for the medulla oblongata are hamperedby its limited accessibility. Systemically administered pharmaceuticals may have some usefulness in future years. Previous experience with vagus nerve stimulation in the treatment of epilepsy suggests that it may have some usefulness in stabilizing medullary autonomic discharges. Computerized electronic stimulation of other cranial nerves may be helpful as well, especially the chorda tympani nerve, and may be most easily accomplished from implanted dental appliances, especially molar modules, transmitting signals via secondary transmitters procedurally placed on cranial nerves. Future technology may enable wireless signaling from the implanted dental appliance to the secondary transmitter placed at the nerve site. By the year 2050 subspecialists in medullary neurology and brain dentistry may use computerized electronic stimulation of cranial nerves to prevent sudden unexpected death and treat "chest pain from the brain".
文摘振荡和波动是出现在太阳黑子内的一种普遍现象,精确测定它的周期对于理解太阳黑子演化有着重要意义.2013年03月13日抚仙湖太阳观测站(Fuxian Solar Observatory,FSO)的一米新真空红外太阳望远镜(The 1m New Vacuum Solar Telescope,NVST)利用谱线Hα(6 562.80)对太阳活动区AR 11692进行了连续的观测,获得了一系列具有高时间分辨率的太阳活动区演化图.利用快速傅里叶变换法,分析了活动区内不同样本点的亮度强度随时间变化规律,测定了这些样本点的振荡周期.结果显示:本影内的振荡周期为165s,而在半影区域内周期为283s,两者近似为倍数关系.
