479 research outputs found
Continuous-wave mud telemetry digital communication system design and the simulation test
AbstractThis paper researched on the continuous wave mud telemetry MWD system based on the frequency modulation (FM) transmission mode. The digital communication system based on the continuous wave mud telemetry was designed. The system architecture design includes the ground signal transceiver devices, the bottom signal transceiver devices, as well as the third part of data transmission channel. In the initial stage of the system design, the wind tunnel simulation tests could be employed. The structure of the wind tunnel test model was designed according to the similarity principle, and a series of wind tunnel simulation tests were carried out for data transmission. Test results showed that the continuous wave mud telemetry MWD system based on the FM transmission mode could achieve higher data transfer rate, improve job reliability, and enhance the adaptability to the environment
Accelerate & Actualize: Can 2D Materials Bridge the Gap Between Neuromorphic Hardware and the Human Brain?
Two-dimensional (2D) materials present an exciting opportunity for devices
and systems beyond the von Neumann computing architecture paradigm due to their
diversity of electronic structure, physical properties, and atomically-thin,
van der Waals structures that enable ease of integration with conventional
electronic materials and silicon-based hardware. All major classes of
non-volatile memory (NVM) devices have been demonstrated using 2D materials,
including their operation as synaptic devices for applications in neuromorphic
computing hardware. Their atomically-thin structure, superior physical
properties, i.e., mechanical strength, electrical and thermal conductivity, as
well as gate-tunable electronic properties provide performance advantages and
novel functionality in NVM devices and systems. However, device performance and
variability as compared to incumbent materials and technology remain major
concerns for real applications. Ultimately, the progress of 2D materials as a
novel class of electronic materials and specifically their application in the
area of neuromorphic electronics will depend on their scalable synthesis in
thin-film form with desired crystal quality, defect density, and phase purity.Comment: Neuromorphic Computing, 2D Materials, Heterostructures, Emerging
Memory Devices, Resistive, Phase-Change, Ferroelectric, Ferromagnetic,
Crossbar Array, Machine Learning, Deep Learning, Spiking Neural Network
Evidences for interaction-induced Haldane fractional exclusion statistics in one and higher dimensions
Haldane fractional exclusion statistics (FES) has a long history of intense
studies, but its realization in physical systems is rare. Here we study
repulsively interacting Bose gases at and near a quantum critical point, and
find evidences that such strongly correlated gases obey simple non-mutual FES
over a wide range of interaction strengths in both one and two dimensions.
Based on exact solutions in one dimension, quantum Monte Carlo simulations and
experiments in both dimensions, we show that the thermodynamic properties of
these interacting gases, including entropy per particle, density and pressure,
are essentially equivalent to those of non-interacting particles with FES.
Accordingly, we establish a simple interaction-to-FES mapping that reveals the
statistical nature of particle-hole symmetry breaking induced by interaction in
such quantum many-body systems. Whereas strongly interacting Bose gases reach
full fermionization in one dimension, they exhibit incomplete fermionization in
two dimensions. Our results open a route to understanding correlated
interacting systems via non-interacting particles with FES in arbitrary
dimensions.Comment: There are 4 figures in the main text as well as a supplemental
materia
Experimental Implementation of Remote State Preparation by Nuclear Magnetic Resonance
We have experimentally implemented remote state preparation (RSP) of a qubit
from a hydrogen to a carbon nucleus in molecules of carbon-13 labeled
chloroform CHCl over interatomic distances using liquid-state
nuclear magnetic resonance (NMR) technique. Full RSP of a special ensemble of
qubits, i.e., a qubit chosen from equatorial and polar great circles on a Bloch
sphere with Pati's scheme, was achieved with one cbit communication. Such a RSP
scheme can be generalized to prepare a large number of qubit states and may be
used in other quantum information processing and quantum computing.Comment: 10 pages,5 PS figure
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