Results 21 to 30 of about 15,531 (235)

Effects of Anosognosia on Static and Dynamic Amplitudes of Low-Frequency Fluctuation in Mild Cognitive Impairment [PDF]

Frontiers in Aging Neuroscience, 2021
Background: Anosognosia is a significant symptom in patients with mild cognitive impairment (MCI) while the underlying neurological mechanism behind it is still unclear.Methods: A total of 121 subjects were included and classified into three groups, including 39 normal controls (NCs), 42 individuals with MCI without anosognosia (MCI-NA), and 40 ...
Fu, Yanv, Luo, Xiao, Zeng, Qingze, Li, Kaicheng, Zhang, Tianyi, Li, Zheyu, Xu, Xiaopei, Hong, Luwei, Chen, Yanxing, Zhang, Minming, Liu, Zhirong   +10 more
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Dynamic changes in fractional amplitude of low-frequency fluctuations in patients with chronic insomnia

Frontiers in Neuroscience, 2022
BackgroundPrevious neuroimaging studies have mostly focused on changes in static functional connectivity in patients with chronic insomnia (CI). Features of dynamic brain activity in patients with CI have rarely been described in detail. The present study investigated changes in dynamic intrinsic brain activity in patients with CI by dynamic fractional
Wei Chen, Hui Wang, Hui Wang, Tianze Sun, Qi Wu, Wenxuan Han, Qian Li, Yong Liu, Yuanping Zhou, Xiuyong He   +9 more
openaire   +3 more sources

Dynamic alterations of amplitude of low-frequency fluctuations in patients with chronic neck pain

Psychoradiology, 2021
Abstract Background The pathogenesis of neck pain in the brain, which is the fourth most common cause of disability, remains unclear. Furthermore, little is known about the characteristics of dynamic local functional brain activity in cervical pain ...
Zhang, Jiabao, Xu, Tao, Wang, Linjia, Chen, Dan, Gong, Lisha, Chen, Huafu, Yu, Jiali, Zhao, Ling, Gao, Qing   +8 more
openaire   +2 more sources

Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Science and Technology of Nuclear Installations, 2022
Intense fluid-dynamic interaction at the impeller outlet strongly affects the unsteady flow and pressure stability within the centrifugal pump. In order to have a better understanding of the pressure fluctuation of centrifugal pumps, a numerical ...
Xiaojie Ma, Lulu Zheng, Jinglei Qu, Mengmeng Wang   +3 more
doaj   +1 more source

Altered dynamic spontaneous neural activity in minimal hepatic encephalopathy

Frontiers in Neurology, 2022
Background and aims:Abnormal regional neural activity has been identified by the analysis of the static amplitude of low-frequency fluctuation (ALFF) in the setting of minimal hepatic encephalopathy (MHE). Brain activity is highly dynamic.
Jie-Ru Guo, Jia-Yan Shi, Qiu-Yi Dong, Yun-Bin Cao, Dan Li, Hua-Jun Chen   +5 more
doaj   +1 more source

Response analysis of 3D braided two-stage gear system excited by different frequency signals

Advances in Mechanical Engineering, 2021
The knitting principle of 3D braided gear was studied, and the dynamic model of the two-stage gear system was established. The fourth-order Runge-Kutta method was used to numerically simulate the dynamic characteristics of common gear and 3D braided gear.
Weiliang Zhang, Xupeng Wang, Xiaomin Ji, Xinyao Tang, Fengfeng Liu, Shuwei Liu, Tengyuan Xue   +6 more
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Abnormal cerebellar-prefrontal cortical pathways in obstructive sleep apnea with/without mild cognitive impairment

Frontiers in Neuroscience, 2022
Obstructive sleep apnea (OSA), a common respiratory sleep disorder, is often associated with mild cognitive impairment (MCI), which is a precursor stage to Alzheimer’s disease (AD).
Yongqiang Shu, Liting Chen, Kunyao Li, Haijun Li, Linghong Kong, Xiang Liu, Panmei Li, Wei Xie, Yaping Zeng, Dechang Peng   +9 more
doaj   +1 more source

Dynamic changes of amplitude of low‐frequency fluctuations in patients with generalized anxiety disorder [PDF]

Human Brain Mapping, 2019
AbstractPrevious neuroimaging studies have mainly focused on alterations of static and dynamic functional connectivity in patients with generalized anxiety disorder (GAD). However, the characteristics of local brain activity over time in GAD are poorly understood.
Qian Cui, Wei Sheng, Yuyan Chen, Yajing Pang, Fengmei Lu, Qin Tang, Shaoqiang Han, Qian Shen, Yifeng Wang, Ailing Xie, Jing Huang, Di Li, Ting Lei, Zongling He, Huafu Chen   +14 more
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The Predictive Value of Dynamic Intrinsic Local Metrics in Transient Ischemic Attack

Frontiers in Aging Neuroscience, 2022
BackgroundTransient ischemic attack (TIA) is known as “small stroke.” However, the diagnosis of TIA is currently difficult due to the transient symptoms.
Huibin Ma, Huibin Ma, Guofeng Huang, Mengting Li, Yu Han, Yu Han, Jiawei Sun, Linlin Zhan, Qianqian Wang, Xize Jia, Xiujie Han, Huayun Li, Yulin Song, Yating Lv   +13 more
doaj   +1 more source

Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Frontiers in Earth Science, 2021
Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it.
Deyang Liang, Deyang Liang, Deyang Liang, Zhichuan Guan, Zhichuan Guan, Zhichuan Guan, Yuqiang Xu, Yuqiang Xu, Yuqiang Xu, Yongwang Liu, Yongwang Liu, Yongwang Liu   +11 more
doaj   +1 more source