Results 181 to 190 of about 727,460 (232)

Refinement of the Quaternary seismic stratigraphy and analysis of buried glacial channels on the Labrador Shelf

Journal of Quaternary Science, EarlyView.
ABSTRACT The Laurentide Ice Sheet covered vast areas of North America during the Wisconsinan, including the Labrador Shelf, off the coast of eastern Canada. The shelf is characterized by glacial cross‐shelf troughs, which have been considered as predominantly eroded by the last ice advance.
Kai‐Frederik Lenz, Felix Gross, A. Catalina Gebhardt, Arne Lohrberg, Ralph Schneider, Henriette Kolling, Florian Riefstahl, Orlando Martinez Bautista, Viktoria Thamm, Sebastian Krastel   +9 more
wiley   +1 more source

The spatial association between peritraumatic and chronic pain and its relation to posttraumatic stress disorder among trauma survivors

Journal of Traumatic Stress, EarlyView.
Abstract Chronic pain frequently co‐occurs with posttraumatic stress disorder (PTSD). One theory proposes that some chronic pain may reflect pain reexperiencing (i.e., reactivation of somatosensory trauma memories). Although some research supports this theory, evidence from clinical survey studies is limited and methodologically constrained.
Sabrina E. Hettegger, Sarah K. Danböck, Michael Liedlgruber, Stephan F. Miedl, Franziska Unterseher, Winfried Rief, Thomas Ehring, Frank H. Wilhelm   +7 more
wiley   +1 more source

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Design of a magnetic gravity compensation system

Precision Engineering, 2006
An extremely accurate positioning over relatively long ranges is accomplished by absorbing or suppressing vibrations. Highly accurate frames or stages should be supported against gravity. In addition, the external disturbance forces acting on these stages need to be cancelled in a feedback control loop.
Elena Lomonova, A J A Vandenput
exaly   +3 more sources

Prismatic Gravity Compensator for Variable Payloads

IEEE Robotics and Automation Letters, 2022
Gravity compensators are passive devices that can lower the energy consumption of lifting systems by reducing the force/torque required from human users or actuators. This paper presents a prismatic gravity compensator for cranes, gantry, and other lifting systems.
Raphaël Furnemónt, Tom Verstraten, Dirk Lefeber, Bram Vanderborght   +3 more
openaire   +3 more sources

Sensorless friction and gravity compensation

2014 IEEE-RAS International Conference on Humanoid Robots, 2014
In this video we present a new controller for robots, called Zero-Friction Zero-Gravity control. The controllers combine terms for compensating the forces exerted by gravity, and the forces of friction of motors and reductions. The consequence of applying this control to a robot (a humanoid robot arm in this case) result in a free movement, as if the ...
Santiago Morante, Juan G. Victores, Santiago Martínez de la Casa Díaz, Carlos Balaguer   +3 more
openaire   +1 more source

Visual servo for gravity compensation system

Neurocomputing, 2017
Abstract This paper proposed a visual servo framework for the tower-crane-like Gravity Compensation System that is widely used in various aerospace ground tests. In this framework, a real-time detection algorithm is proposed to measure the position of the target.
Ye Jin, Rui Wu 0002, Weiming Liu, Xianglong Tang   +3 more
openaire   +2 more sources

Gravity compensation in robotics

Advanced Robotics, 2015
The actuator power required to resist joint torque caused by the weight of robot links can be a significant problem. Gravity compensation is a well-known technique in robot design to achieve equilibrium throughout the range of motion and as a result to reduce the loads on the actuator.
openaire   +2 more sources

A review on passive gravity compensation

2017 International conference of Electronics, Communication and Aerospace Technology (ICECA), 2017
An articulated robot arm with multiple links will spend most of its energy on carrying its own weight when it works against gravity. A gravitational torque occurs due to the mass of the robot links and the payload, but most of the gravitational torque is caused by the mass of the robot links.
Yogeshkumar R. Chheta, Rajesh M. Joshi, Krishan Kumar Gotewal, M. ManoahStephen   +3 more
openaire   +1 more source

The Application of FCMAC in Cable Gravity Compensation

2005
The cable compensation system is an experiment system that performs simulations of partial or microgravity environments on earth. It is a highly nonlinear and complex system. In this paper, a network based on the theory of the Fuzzy Cerebellum Model Articulation Controller (FCMAC) is proposed to control this cable compensation system. In FCMAC, without
Xu-Mei Lin, Tao Mei, Hui-Jing Wang, Yan-Sheng Yao   +3 more
openaire   +2 more sources

Design of a Linear Gravity Compensator for a Prismatic Joint

2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2020
Most existing mechanical gravity compensators have been developed for revolute joints that are found in majority of articulated robot arms. However, robots such as patient transport robots use prismatic joints, which need to handle a heavy payload.
Do-Won Kim, Won-Bum Lee, Jae-Bok Song
openaire   +2 more sources