Results 71 to 80 of about 95,004 (291)

Analysis of dynamic characteristics for momentum wheel assembly with joint clearance

Advances in Mechanical Engineering, 2018
To study the effects of joint clearance on the dynamic characteristics of the momentum wheel assembly of satellite antennas, the computational dynamic model of momentum wheel assembly is developed in this article, considering influencing factors ...
Qi Wan, Geng Liu, Haitao Shi, Xiaofeng Zhang, Xin Ning   +4 more
doaj   +1 more source

Developmental and Epileptic Encephalopathy due to Biallelic Pathogenic Variants in PIGM

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective PIGM encodes a critical enzyme in the glycosylphosphatidylinositol (GPI)‐anchor biosynthesis pathway. While promoter‐region mutations in PIGM have been associated with a relatively mild phenotype characterized by portal vein thrombosis and absence seizures, recent evidence suggests that coding‐region mutations result in a more severe
Júlia Sala‐Coromina, Anna Marcé‐Grau, Barbara Masotto, Marta Codina, Lamia BenJemaa, Yasmina Elaribi, Mónica Martinez‐Gallo, Roger Colobran, Angel Sanchez‐Montañez, Irene Valenzuela, Yoshiko Murakami, Alfons Macaya   +11 more
wiley   +1 more source

Innate Immune Reprogramming Mediated by Endogenous Retroelement Dysregulation Drives Multiple Sclerosis Progression

Annals of Clinical and Translational Neurology, EarlyView.
Epigenetic reprogramming in hematopoietic stem and progenitor cells (HSPCs) and downstream myeloid cells, mediated by H3.3 downregulation and endogenous retroelement (ERE) overexpression, contributes to the progression of multiple sclerosis (MS). ABSTRACT Background Skewed myelopoiesis in the bone marrow has been identified as a key driver of multiple ...
Li‐Mei Xiao, Qiu‐Ping Zhao, Run‐Yun Li, Wei Chen, Huan‐Huan Song, Wan‐Jin Chen, Ying Fu   +6 more
wiley   +1 more source

Numerical and experimental study on dynamics of the planar mechanical system considering two revolute clearance joints

International Journal of Mechanical System Dynamics, 2021
Due to assembly, wear and manufacturing errors and clearance in the joints are inevitable. When the clearance is introduced into a mechanical system, the impact force in the clearance joint will cause undesirable vibration of the system.
Zhengfeng Bai, Fusong Xu, Jijun Zhao
doaj   +1 more source

A DOE and kriging-based model for studying on the dynamics of multibody mechanical systems with revolute joint clearance : draft [PDF]

, 2013
Over the last two decades, extensive work has been done to study the dynamic effect of the joint clearances in multibody mechanical systems. In contrast, little work has been devoted to optimize the performance of these systems.
Flores, Paulo, Xu, Liang, Hamid M. Lankarani, Zhang, Zhenhua, Lankarani, H. M., Liang Xu, Lankarani, Hamid M., Zhenhua Zhang, Paulo Flores   +8 more
core   +1 more source

Dynamics Simulation and Experiment of the Slider-crank Mechanism with Dry Friction Clearance Joint

Jixie chuandong, 2017
Based on dynamics simulation software,the dynamics analysis of the slider-crank mechanism with clearance joint is carried out and the effect of joint with different clearance size under dry contact and non-friction conditions on dynamic response of ...
Han Yuncheng, Xu Lixin, Huang Xiaoqiu
doaj  

Research on Non-Probabilistic Reliability Partitioning Methods for Large Workspace Robots

Machines
Large-scale high-end equipment robotic precision operations have large workspaces and numerous uncertainties. They have an unevenly distributed error effect on the position in space. The current conventional stereotyping method ignores the uncertainty in
Jianping Sun, Weian Yang, Xin Meng, Jun Peng, Zhaoping Tang   +4 more
doaj   +1 more source

Sex Representation in US Stroke Clinical Trials: A Decade of Trends and Challenges

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Stroke remains a major cause of disability and mortality in the US, with significant sex‐based disparities, and females remain underrepresented in stroke clinical trials. We aimed to examine sex representation in US‐based stroke clinical trials, identify trial characteristics associated with higher female enrollment (≥ 50%), and ...
Chaitali Dagli, Mudasir Andrabi, Tova Cohen, Pranali G. Patel, Tapasya Katta, Chen Lin   +5 more
wiley   +1 more source

Effects of balancing and link flexibility on dynamics of a planar mechanism having joint clearance [PDF]

, 2012
An experimental study is proposed to investigate the effects of balancing and link flexibility on the dynamics of a mechanism with imperfect revolute joints, that is, joints having radial clearance. A planar slider-crank mechanism, widely used in vehicle
Uzmay, I.̇., I.̇. Uzmay, S. Erkaya, UZMAY, Ibrahim, Erkaya, S., Erkaya, Selçuk   +5 more
core   +1 more source

含间隙平面连杆机构动态特性研究

Jixie chuandong, 2001
This paper takes account of the boundary condition of elements of a joint with clearance when contact occur, by using the nonlinear spring damper formulation to model the resulting reaction force between the elements of clearance joint.
王国庆, 刘宏昭
doaj