New approach to quantum corrections in synchrotron radiation. II

1978 ◽  
Vol 18 (10) ◽  
pp. 3863-3872 ◽  
Author(s):  
Wu-yang Tsai
Keyword(s):  
Synchrotron Radiation ◽  
Quantum Corrections ◽  
New Approach

New approach to quantum corrections in synchrotron radiation

1978 ◽  
Vol 110 (1) ◽  
pp. 63-84 ◽  
Author(s):  
Julian Schwinger ◽  
Wu-yang Tsai
Keyword(s):  
Synchrotron Radiation ◽  
Quantum Corrections ◽  
New Approach

scholarly journals QUANTUM CORRECTIONS TO NEWTON'S LAW

2002 ◽  
Vol 17 (36) ◽  
pp. 2371-2381 ◽  
Author(s):  
B. F. L. WARD
Keyword(s):  
Scalar Field ◽  
Quantum Gravity ◽  
Quantum Corrections ◽  
New Approach ◽  
Newton's Law ◽  
Newton’S Law

We present a new approach to quantum gravity starting from Feynman's formulation for the simplest example, that of a scalar field as the representative matter. We show that we extend his treatment to a calculable framework using resummation techniques already well-tested in other problems. Phenomenological consequences for Newton's law are described.

scholarly journals Parallel Approach of Schr¨Odinger Based Quantum Corrections for Ultrascaled Semiconductor Devices

2021 ◽  
Author(s):  
G. Espiñeira ◽  
A. J. Garc´ıa-Loureiro ◽  
N. Seoane
Keyword(s):  
Message Passing ◽  
Message Passing Interface ◽  
Time Frame ◽  
Quantum Corrections ◽  
Computational Time ◽  
Perfect Agreement ◽  
New Approach ◽  
Classical Simulation ◽  
Reasonable Time Frame ◽  
Variability Study

Abstract In the current technology node, purely classical numerical simulators lack the precision needed to obtain valid results. At the same time, the simulation of fully quantum models can be a cumbersome task in certain studies such as device variability analysis, since a single simulation can take up to weeks to compute and hundreds of device configurations need to be analyzed to obtain statistically significative results. A good compromise between fast and accurate results is to add corrections to the classical simulation that are able to reproduce the quantum nature of matter. In this context, we present a new approach of Schrödinger equation-based quantum corrections. We have implemented it using Message Passing Interface (MPI) in our in-house built semiconductor simulation framework called VENDES, capable of running in distributed systems that allow for more accurate results in a reasonable time frame. Using a 12 nm gate length Gate-AllAround Nanowire FET (GAA NW FET) as an application example, the new implementation shows an almost perfect agreement in the output data with less than a 2% difference between the cases using 1 and 16 processes. Also, a reduction of up to 98% in the computational time has been found comparing the sequential and the 16 process simulation. For a reasonably dense mesh of 150k nodes, a variability study of 300 individual simulations, can be now performed with VENDES in approximately 2.5 days instead of an estimated sequential execution of 137 days.

scholarly journals QUANTUM CORRECTIONS TO NEWTON'S LAW IN RESUMMED QUANTUM GRAVITY

2005 ◽  
Vol 20 (15) ◽  
pp. 3502-3505 ◽  
Author(s):  
B. F. L. WARD
Keyword(s):  
Scalar Field ◽  
Quantum Gravity ◽  
Quantum Correction ◽  
Quantum Corrections ◽  
New Approach ◽  
Newton's Law ◽  
Newton’S Law

We present the elements of resummed quantum gravity, a new approach to QG based on the work of Feynman using the simplest example of a scalar field as the representative matter. We show that we get a UV finite quantum correction to Newton's law.

scholarly journals Time Resolved Transient Circular Dichroism Spectroscopy Using Synchrotron Natural Polarisation

2019 ◽  
Author(s):  
François Auvray ◽  
David Dennetière ◽  
Alexandre Giuliani ◽  
Frédéric Jamme ◽  
Frank Wien ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Nano Structure ◽  
Time Resolved ◽  
New Approach ◽  
X Ray Scattering ◽  
Wide Range ◽  
Potential Applications ◽  
Acquisition Speed ◽  
Circular Dichroïsm

<a>Ultraviolet (UV) synchrotron radiation circular dichroism (SRCD) spectroscopy has made an important contribution to the determination and understanding of the structure of biomolecules. In this paper, we demonstrate an innovative time-resolved SRCD (tr-SRCD) technique, overcoming limitations of current broadband UV SRCD setups, to access ultrafast (down to nanoseconds) time-scales, previously measurable only by other techniques, such as infrared (IR), nuclear magnetic resonance (NMR), fluorescence and absorbance spectroscopies and small angle X-ray scattering (SAXS). The tr-SRCD setup takes advantage of the natural polarisation of the synchrotron radiation emitted by a bending magnet to record broadband UV CD faster than any current SRCD setup, improving the acquisition speed from 10 mHz to 130 Hz and the accessible temporal resolution by 11 orders of magnitude. We illustrate the new approach by following the photoisomerization of an azopeptide. This breakthrough in SRCD spectroscopy opens up a wide range of potential applications to the detailed characterisation of biological processes, such as protein folding, protein-ligand binding and DNA nano-structure formation.<br></a>

Time Resolved Transient Circular Dichroism Spectroscopy Using Synchrotron Natural Polarisation

2019 ◽  
Author(s):  
François Auvray ◽  
David Dennetière ◽  
Alexandre Giuliani ◽  
Frédéric Jamme ◽  
Frank Wien ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Time Resolved ◽  
New Approach ◽  
X Ray Scattering ◽  
Wide Range ◽  
Potential Applications ◽  
Acquisition Speed ◽  
Concentration Changes ◽  
Circular Dichroïsm

<a> </a><p><a></a><a>Ultraviolet (UV) synchrotron radiation circular dichroism (SRCD) spectroscopy has made an important contribution to the determination and understanding of the structure of bio-molecules. In this paper, we report an innovative</a> approach that we term time-resolved SRCD (tr-SRCD), which overcomes the limitations of current broadband UV SRCD setups. This technique allows accessing ultrafast time scales (down to nanoseconds), previously measurable only by other methods, such as infrared (IR), nuclear magnetic resonance (NMR), fluorescence and absorbance spectroscopies and small angle X-ray scattering (SAXS). The tr-SRCD setup takes advantage of the natural polarisation of the synchrotron radiation emitted by a bending magnet to record broadband UV CD faster than any current SRCD setup, improving the acquisition speed from 10 mHz to 130 Hz and the accessible temporal resolution by several orders of magnitude. We illustrate the new approach by following the isomers concentration changes of an azopeptide after a photoisomerisation. This breakthrough in SRCD spectroscopy opens up a wide range of potential applications to the detailed characterisation of biological processes, such as protein folding, protein-ligand binding.<a></a></p>

On the quantum corrections in synchrotron radiation

1980 ◽  
Vol 163 ◽  
pp. 133-155
Author(s):  
Walter Dittrich ◽  
V̇olker Schanbacher
Keyword(s):  
Synchrotron Radiation ◽  
Quantum Corrections
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