Results 41 to 50 of about 4,920,547 (298)

Appropriate constraints for variational optimization of electronic density matrices and electron densities [PDF]

open access: yesProceedings of the National Academy of Sciences, 1982
Euler equations characteristic of the electronic reduced density matrix have previously been obtained by minimizing an energy functional subject to trace constraints 〈 P K 〉 = N , in ...
openaire   +2 more sources

In situ and ground-based intercalibration measurements of plasma density at l = 2.5 [PDF]

open access: yes, 2003
[1] Two independent ground-based experiments and two satellite-borne experiments are used to interpret the changes in plasmaspheric composition at the same point in space during moderate geomagnetic activity on 22 January and 14 February 2001.
Bailey, G.J.   +12 more
core   +1 more source

Study on Electron Density Anomalies Possibly Related to Earthquakes Based on CSES Observations

open access: yesRemote Sensing, 2023
This research examines the correlation between seismic activity and variations in ionospheric electron density (Ne) using the data from the Langmuir probe (LAP) onboard the China Seismo-Electromagnetic Satellite (CSES) during nighttime.
Chengcheng Han   +8 more
doaj   +1 more source

Shock-wave-based density down ramp for electron injection

open access: yesPhysical Review Special Topics. Accelerators and Beams, 2012
We demonstrate a sharp density transition for electron injection in laser wakefield acceleration through numerical study. This density transition is generated by a detached shock wave induced by a cylinder inserted into a supersonic helium gas flow. In a
Chunmei Wang   +3 more
doaj   +1 more source

First Experimental Quantitative Charge Density Studies of Advanced Intermediate of Vitamin D Analogues

open access: yesMolecules, 2022
Vitamins D are a group of fat-soluble secosteroids which play a regulatory role in the functioning of most cells. Rational design of new vitamin D analogs, of increased therapeutic potency and lowered calcemic side effects, requires high-resolution ...
Monika Wanat   +3 more
doaj   +1 more source

Ionospheric S4 Scintillations from GNSS Radio Occultation (RO) at Slant Path

open access: yesRemote Sensing, 2020
Ionospheric scintillation can significantly degrade the performance and the usability of space-based communication and navigation signals. Characterization and prediction of ionospheric scintillation can be made from the Global Navigation Satellite ...
Dong L. Wu
doaj   +1 more source

Effect of free valence on the electronic structure of n-alcohol radicals

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2023
The paper presents the results of a study of the effect of free valence (when a hydrogen atom is separated) on the electronic structure of n-alcohol radicals by the example of radicals of n-heptanol derivatives (C●H2-(CH2)6OH, CH3-C●H-(CH2)5OH, C2H5-C●H-(
V.V. Turovtsev   +3 more
doaj   +1 more source

electron density

open access: yes, 2014
Citation: 'electron density' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.E01986 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +2 more sources

Quantum-mechanical calculation of the structural and energetic characteristics of the fluorinealcanes

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2023
Within the «quantum theory of atoms in molecules» the charge q and volume V of topological atoms A and atomic groups R of fluorinated molecules of ethanes C2HmFk, where 0 ≤ m, k ≤ 6 and m+k = 6 and propanes C3HmFk, where 0 ≤ m, k ≤ 8, m+k = 8, has been
A.V. Kotomkin, Yu.D. Orlov
doaj   +1 more source

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

open access: yesFEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

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