Results 11 to 20 of about 161,184 (203)
Optomechanical Accelerometers for Geodesy
Remote Sensing, 2022 We present a novel optomechanical inertial sensor for low-frequency applications and corresponding acceleration measurements. This sensor has a resonant frequency of 4.715 (1) Hz, a mechanical quality factor of 4.76(3) × 105, a test mass of 2.6 g, and a projected noise floor of approximately 5 × 10−11 ms−2/Hz at 1 Hz.
Adam S. Hines +6 more
openaire +3 more sources
Sleep classification from wrist-worn accelerometer data using random forests
Scientific Reports, 2021 Accurate and low-cost sleep measurement tools are needed in both clinical and epidemiological research. To this end, wearable accelerometers are widely used as they are both low in price and provide reasonably accurate estimates of movement.
Kalaivani Sundararajan +11 more
semanticscholar +1 more source
British Journal of Sports Medicine, 2021 The inter-relationship between physical activity, sedentary behaviour and sleep (collectively defined as physical behaviours) is of interest to researchers from different fields.
J. Migueles +13 more
semanticscholar +1 more source
Fabrication of a Miniaturized ZnO Nanowire Accelerometer and Its Performance Tests
Sensors, 2016 This paper reports a miniaturized piezoelectric accelerometer suitable for a small haptic actuator array. The accelerometer is made with zinc oxide (ZnO) nanowire (NW) grown on a copper wafer by a hydrothermal process.
Hyun Chan Kim, Sangho Song, Jaehwan Kim
doaj +1 more source
Accelerometer-derived physical activity and risk of atrial fibrillation.
European Heart Journal, 2021 AIMS Physical activity may be an important modifiable risk factor for atrial fibrillation (AF), but associations have been variable and generally based on self-reported activity.
S. Khurshid +9 more
semanticscholar +1 more source
Sensors, 2018 Compensation of gravity disturbance can improve the precision of inertial navigation, but the effect of compensation will decrease due to the accelerometer bias, and estimation of the accelerometer bias is a crucial issue in gravity disturbance ...
Junbo Tie +5 more
doaj +1 more source
Sensors, 2021 Pedestrian Navigation System (PNS) is one of the research focuses of indoor positioning in GNSS-denied environments based on the MEMS Inertial Measurement Unit (MIMU). However, in the foot-mounted pedestrian navigation system with MIMU or mobile phone as
Tianyu Chen +4 more
doaj +1 more source
Journal for the Measurement of Physical Behaviour, 2019 Recent technological advances have transformed the research on physical activity initially based on questionnaire data to the most recent objective data from accelerometers.
J. Migueles +4 more
semanticscholar +1 more source
Robust Optimization of a MEMS Accelerometer Considering Temperature Variations
Sensors, 2015 A robust optimization approach for a MEMS accelerometer to minimize the effects of temperature variations is presented. The mathematical model of the accelerometer is built.
Guangjun Liu +3 more
doaj +1 more source
Sports Medicine, 2017 BackgroundAccelerometers are widely used to measure sedentary time, physical activity, physical activity energy expenditure (PAEE), and sleep-related behaviors, with the ActiGraph being the most frequently used brand by researchers.
J. Migueles +8 more
semanticscholar +1 more source