Results 81 to 90 of about 635,548 (284)

Quantum astrometric observables II: time delay in linearized quantum gravity [PDF]

, 2013
A clock synchronization thought experiment is modeled by a diffeomorphism invariant "time delay" observable. In a sense, this observable probes the causal structure of the ambient Lorentzian spacetime. Thus, upon quantization, it is sensitive to the long
Sub String Theory Cosmology and ElemPart, Béatrice Bonga, Bonga, B., Khavkine, I., Khavkine, Igor, Quantum Gravity, Strings and Elementary Particles, Theoretical Physics, Bonga, Béatrice, Igor Khavkine   +8 more
core   +2 more sources

Multidirectional Motion Strategy of Miniature Water Surface Robot Actuated by Single Exciter

Advanced Robotics Research, EarlyView.
A novel multidirectional motion strategy on the water surface based on a single exciter is proposed, and a single‐exciter single‐plate module is developed for actuation. The driving forces generation mechanism of the module is revealed from the perspective of the asymmetric surface wave field.
Haoxuan He, Dehong Wang, Jing Li, Shijing Zhang, Yingxiang Liu   +4 more
wiley   +1 more source

The GOCE observations for detecting the full extent of the crust to mantle section brought to the surface in the Kohistan Arc, Himalaya

, 2012
The aim of this work is to use the GOCE observations in a geologically unique part of the Himalayan orogen, which is the Kohistan arc. Here the entire section of the crust from the mantle-crust transition, to the volcanic deposits in the upper crust are ...
SINCICH, EVA, TENZE, DANIELE, BRAITENBERG, CARLA, MARIANI, PATRIZIA   +3 more
core  

Why gravity is not an entropic force [PDF]

, 2010
The remarkable connections between gravity and thermodynamics seem to imply that gravity is not fundamental but emergent, and in particular, as Verlinde suggested, gravity is probably an entropic force.
Gao, Shan, Shan, Gao
core  

Spacetime and the Philosophical Challenge of Quantum Gravity [PDF]

, 2001
We survey some philosophical aspects of the search for a quantum theory of gravity, emphasising how quantum gravity throws into doubt the treatment of spacetime common to the two `ingredient theories' (quantum theory and general relativity), as a 4 ...
Butterfield, Jeremy, Jeremy Butterfield, Christopher Isham, Isham, Chris   +3 more
core   +1 more source

Identifying Physical Interactions in Contact‐Based Robot Manipulation for Learning from Demonstration

Advanced Robotics Research, EarlyView.
Robots can learn manipulation tasks from human demonstrations. This work proposes a versatile method to identify the physical interactions that occur in a demonstration, such as sequences of different contacts and interactions with mechanical constraints.
Alex Harm Gert‐Jan Overbeek, Herman van der Kooij, Douwe Dresscher, Mark Vlutters   +3 more
wiley   +1 more source

Detection of Earth’s Free Oscillations Utilizing TianQin

Space: Science & Technology
The measurement of Earth’s free oscillations plays an important role in studying Earth’s large-scale structure. Space technology development presents a potential method to observe these normal modes by measuring intersatellite distances.
Yuxin Yang, Kun Liu, Xuefeng Zhang, Yiming Hu   +3 more
doaj   +1 more source

Scale Factor Calibration for a Rotating Accelerometer Gravity Gradiometer

Sensors, 2018
Rotating Accelerometer Gravity Gradiometers (RAGGs) play a significant role in applications such as resource exploration and gravity aided navigation. Scale factor calibration is an essential procedure for RAGG instruments before being used.
Zhongguang Deng, Chenyuan Hu, Xiangqing Huang, Wenjie Wu, Fangjing Hu, Huafeng Liu, Liangcheng Tu   +6 more
doaj   +1 more source

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Anti-Swaying Control Strategy of Ship-Mounted 3-RCU Parallel Platform Based on Dynamic Gravity Compensation

Machines
It is essential to ensure stability during marine transportation or the installation of high center of gravity loads. The heavy loads increase gravity disturbance, affecting the steady-state-error control of the multiple degrees of freedom (DOFs) motion ...
Zhiyuan Lv, Pengfei Liu, Donghong Ning, Shuqing Wang   +3 more
doaj   +1 more source