Results 71 to 80 of about 1,290,925 (294)

Upper Cervical Cord Area as a Biomarker of Conversion to Secondary Progressive Multiple Sclerosis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective This study assessed whether upper cervical cord area (UCCA) measured on routine brain MRI can serve as a biomarker of conversion to SPMS. Methods This is a single‐center retrospective cohort study of RRMS patients with cross‐sectional and longitudinal analyses of clinical and MRI data. Future SPMS converters were matched by age, sex,
Nabil K. El Ayoubi, Sola Al Ghazal, Salem Hannoun, Medhat A. Siddik, Nour M. Najjar, Jim Dagher, Joseph Abboud, Myriam G. Semaan, Samia J. Khoury   +8 more
wiley   +1 more source

Gyroscopes and electronic accelerometers for angular velocity measurement of mechanisms

, 2020
La determinación de la posición y orientación juega un rol importante en la descripción de cuerpos rígidos y mecanismos en general. Entre estos últimos se encuentran, por ejemplo: robots, sistemas de visión, aeronaves, satélites y submarinos.
JESUS FERNANDO GUTIERREZ GARCIA
core  

Parametrically Excited Micromechanical Absolute Angular Velocity Sensor

, 2020
© 2020 IEEE. It is shown that the information redundancy of a three-degree hybrid micromechanical gyroscope (the output information of the device is contained not only in the amplitude of the rotor deflection, but also in the frequency and phase of its ...
L. Bakhtieva, V. Bogolyubov, Bakhtieva L., Bogolyubov V.   +3 more
core   +1 more source

Gravity‐Dependent Modulation of Downbeat Nystagmus: Insights From Velocity‐Storage Dysfunction

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Downbeat nystagmus varies with head position, a phenomenon termed gravity‐dependent modulation. We aimed to clarify its mechanism using a velocity‐storage model. Methods In 10 patients with downbeat nystagmus due to cerebellar disorders, we recorded eye movements at different pitch‐ and roll‐axis head positions.
Ji‐Hyung Park, Eun‐Hyuk Choi, Jorge Otero‐Millan, David S. Zee, Jeong‐Yoon Choi, Ji‐Soo Kim   +5 more
wiley   +1 more source

Angular velocity: a new dimension in nuclei [PDF]

Nature, 1984
Nuclei can be studied from their ground states (∼0 ħ) up to angular momenta of order 100 ħ, where they are literally pulled apart by centrifugal effects. This range of angular momenta can be viewed as resulting from ‘cranking’ the nucleus around a ‘rotation’ axis, where the critical variable is the cranking velocity.
Diamond, R.M., Stephens, F.S.
openaire   +2 more sources

Angular velocity and amplitude distributions.

, 2015
Histograms for the amplitude, velocity and duration of head saccades are calculated from a total of 443 saccadic head movements for different head saccade size classes from six different bumblebees. Saccades were detected as peaks in yaw angular velocity.
Norbert Boeddeker (793709), Martin Egelhaaf (112), Laura Dittmar (793710), Marcel Mertes (268658)   +3 more
core   +1 more source

Using machine learning and computer vision to estimate the angular velocity of wind turbines in smart grids remotely

, 2021
Today, power generation from clean and renewable resources such as wind and solar is of great salience. Smart grid technology efficiently responds to the increasing demand for electric power.
Xin, Qin, Xin, Q, Zanjireh, Morteza Mohammadi, Zanjireh, Morteza Mohammadi,, Abedini, F, Xin, Qin,, Zanjireh, MM, Abedini, Fereshteh,, Mirjalili, S, Bahaghighat, Mahdi,, Mirjalili, Seyedali,, Bahaghighat, M, Bahaghighat, Mahdi, Abedini, Fereshteh, Mirjalili, Seyedali   +14 more
core   +1 more source

Global Rather Than Vertical‐Selective Saccadic Abnormalities in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To test whether vertical saccades are preferentially affected in Progressive Supranuclear Palsy (PSP). Methods PSP patients (n = 24) were compared to age‐matched controls (n = 94) and two degenerative groups (Alzheimer's disease, n = 20; Lewy body disease, n = 50).
Duy Duan Nguyen, Mark Paine, Soohyun Lee, Amir Fazlollahi, Baibin (Ben) Wang, John D. O'Sullivan, Peter J. Nestor   +6 more
wiley   +1 more source

Attitude Algorithm of Gyroscope-Free Strapdown Inertial Navigation System Using Kalman Filter

Micromachines
A gyroscope-free strapdown inertial navigation system (GFSINS) solves the carrier attitude through the reasonable spatial combination of accelerometers, with a particular focus on the precision of angular velocity calculation.
Xiong Jiang, Tao Liu, Jie Duan, Maosheng Hou   +3 more
doaj   +1 more source

White Matter and Perivascular Imaging Changes in Alzheimer's Disease and Cerebral Amyloid Angiopathy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Peak‐width of skeletonized mean diffusivity (PSMD) and diffusion tensor imaging–analysis along the perivascular space (DTI‐ALPS), reflecting white matter integrity and glymphatic function, are altered in Alzheimer's disease (AD).
Debina Laishram, Guangwei Du, Sangam Kanekar, Nandakumar Nagaraja   +3 more
wiley   +1 more source