Results 61 to 70 of about 1,151,732 (292)

Total Electron Content Studies of the Ionosphere

, 1973
Abstract : Radio waves that pass through the earth's ionosphere travel more slowly than their free space velocity due to the group path delay of the ionosphere. This group path delay, directly proportional to the total electron content of the ionosphere, can be an important source of error to VHF, UHF and L-band satellite detection radars and satellite
Jules Aarons, Douglas R. Seeman, Santi Basu, Michael Mendillo, John A. Klobuchar   +4 more
openaire   +2 more sources

Transferrin receptor 1‐mediated iron uptake supports thermogenic activation in human cervical‐derived adipocytes

FEBS Letters, EarlyView.
In this study, we found that human cervical‐derived adipocytes maintain intracellular iron level by regulating the expression of iron transport‐related proteins during adrenergic stimulation. Melanotransferrin is predicted to interact with transferrin receptor 1 based on in silico analysis.
Rahaf Alrifai, Mizuki Seo, Gyath Karadsheh, Fachrur Rizal Mahendra, Máté Á Demény, Ferenc Győry, János András Mótyán, László Fésüs, Endre Kristóf, Rini Arianti   +9 more
wiley   +1 more source

VARIATIONS OF IONOSPHERIC PARAMETERS OVER ALMATY (KAZAKHSTAN) IN 1999–2013

Solar-Terrestrial Physics, 2019
The paper presents the results of a study of the behavior of ionospheric parameters of the total electron content, I(t), and electron density in the maximum F2 layer, Nm, over Almaty (Kazakhstan) [43.25° N; 76.92° E] in 1999–2013. The time interval under
Mukasheva S.N., Kapytin V.I., Malimbayev A.M.   +2 more
doaj   +1 more source

Reconstruction of F2 layer peak electron density based on operational vertical total electron content maps [PDF]

Annales Geophysicae, 2013
Electron density is the major determining parameter of the ionosphere. Especially the maximum electron density of the F2 layer in the ionosphere, NmF2, is of particular interest with regard to the HF radio communication applications as well as for ...
T. Gerzen, N. Jakowski, V. Wilken, M. M. Hoque   +3 more
doaj   +1 more source

Optimizing a sustainable ultrasound assisted extraction method for the recovery of polyphenols from lemon by-products:comparison with hot water and organic solvent extractions [PDF]

, 2018
Response surface methodology (RSM) based on a three-factor and three-level Box–Behnken design was employed for optimizing the aqueous ultrasound-assisted extraction (AUAE) conditions, including extraction time (35–45 min), extraction temperature (45–55 ...
Bowyer, Michael C., Golding, John B., Papoutsis, Konstantinos, Pristijono, Penta, Scarlett, Christopher J., Stathopoulos, Costas E., Vuong, Quan V.   +6 more
core   +2 more sources

Derivations of the Total Radiation Belt Electron Content

Journal of Geophysical Research: Space Physics
AbstractWe present multiple derivations of the Total Radiation Belt Electron Content (TRBEC), an indicator of the global number of electrons that instantaneously occupy the radiation belts. Derived from electron flux measurements, the TRBEC reduces the spatial information into a scalar quantity that concisely describes global aspects of the system ...
Jared C. Pitzel, Christopher M. Cully, Jean‐Francois Ripoll, Vivien Loridan, Chia‐Lin Huang, Harlan E. Spence, Geoff D. Reeves, Kyle R. Murphy   +7 more
openaire   +2 more sources

Ionospheric total electron content: Spatial patterns of variability [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractThe distinctive spatial patterns of the ionosphere's total electron content (TEC) response to solar, seasonal, diurnal, and geomagnetic influences are determined across the globe using a new statistical model constructed from 2‐hourly TEC observations from 1998 to 2015.
J. L. Lean, R. R. Meier, J. M. Picone, F. Sassi, J. T. Emmert, P. G. Richards   +5 more
openaire   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

TEC and f0F2 comparison

Annals of Geophysics, 1994
Following an investigation on the calibration of Faraday Rotation measurements by the slab thickness method, several interesting results have been obtained concerning the limits of application of TEC data in f0F2 modelling at middle latitudes.
L. Cairolo, P. Spalla
doaj   +1 more source

Web Based Automated Total Electron Content Computation

2007 3rd International Conference on Recent Advances in Space Technologies, 2007
Total Electron Content (TEC), is widely used in monitoring ionospheric effects. TEC is expressed as the amount of free electrons within 1 m2 cross-sectional area of the region between ground and ionosphere. Although IRI and IGS analysis centers can generate and present TEC estimations, either the temporal resolution is low or estimations are based on ...
Ugurlu, Orhan, Sezen, Umut, Alkar, Ali Ziya   +2 more
openaire   +2 more sources