Results 71 to 80 of about 6,644,877 (248)

Striped quantum Hall phases

open access: yes, 2000
Recent experiments seem to confirm predictions that interactions lead to charge density wave ground states in higher Landau levels. These new ``correlated'' ground states of the quantum Hall system manifest themselves for example in a strongly ...
ADY STERN   +3 more
core   +4 more sources

Practical implementation of the diagnostic reference levels concept for the common radiographic examinations

open access: yesРадиационная гигиена, 2017
The modern approach to the radiation protection of the patients from medical exposure is mainly based on the principle of optimization using diagnostic reference levels.
A. V. Vodovatov
doaj   +1 more source

Alternative Adaptive Filter Structures for Improved Radio Frequency Interference Cancellation in Radio Astronomy

open access: yes, 2010
In radio astronomy, reference signals from auxiliary antennas that receive only the radio frequency interference (RFI) can be modified to model the RFI environment at the astronomy receivers.
Mitchell, D. A.   +2 more
core   +1 more source

Optimization of constant power control of wind turbines to provide power reserves [PDF]

open access: yes, 2013
In several countries, the wind power penetration increased tremendously in the last years. As the current wind turbines do not participate in frequency control nor reserve provision, this may compromise the proper functioning of the primary control and ...
De Kooning, Jeroen   +4 more
core   +1 more source

Reference values of gait characteristics in community-dwelling older persons with different physical functional levels

open access: yesBMC Geriatrics, 2022
Background Mobility is one major component of healthy ageing of older persons. It includes gait speed, nowadays valued as the sixth vital sign of ageing.
Ulrike Dapp   +4 more
doaj   +1 more source

Reference ranges for serum immunoglobulin (IgG, IgA, and IgM) and IgG subclass levels in healthy children

open access: yesTurkish Journal of Medical Sciences, 2019
Background/aim The serum immunoglobulin levels are used routinely in clinical practice because they provide key information on the humoral immune status.
R. Bayram   +4 more
semanticscholar   +1 more source

Current Principles of Motor Control, with Special Reference to Vertebrate Locomotion.

open access: yesPhysiological Reviews, 2020
The vertebrate control of locomotion involves all levels of the nervous system from cortex to the spinal cord. Here, we aim at covering all main aspects of this complex behavior - from the operation of the microcircuits in the spinal cord to the systems ...
S. Grillner, A. El Manira
semanticscholar   +1 more source

Validation of suitable internal control genes for expression studies in aging. [PDF]

open access: yes, 2009
Quantitative data from experiments of gene expression are often normalized through levels of housekeeping genes transcription by assuming that expression of these genes is highly uniform. This practice is being questioned as it becomes increasingly clear
Bacalini, MARIA GIULIA   +9 more
core   +1 more source

Maintenance of Millimeter-level Geodetic Reference Framework

open access: yesJournal of Geodesy and Geoinformation Science, 2023
The high-precision terrestrial reference frame, as the spatial benchmark for geodesy, is an important national infrastructure. However, due to the influence of nonlinear factors related to geophysical phenomena, the overall maintenance accuracy of the ITRF framework is still at the centimeter level.
openaire   +1 more source

Blue Sky Olympics: Satellite Observations of Air Quality During the 2008 Beijing Olympics [PDF]

open access: yes, 2019
China has imposed short-term emission control regulations on industry and transportation to quickly improve air quality during certain events, including the 2008 Summer Olympic Games.
Butcher, Lincoln M.
core   +1 more source

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