Results 251 to 260 of about 4,611,274 (296)

Solar activity and the solar cycle

Advances in Space Research, 2003
Abstract Solar activity prediction methods have been wide-ranging, mostly numerical, and essentially curve fitting. Thus for many years the search for physically based methods has remained elusive. Surprisingly, a new class of methods does seem to be making progress, and it relates to the structure of the field within the Sun and heliosphere.
openaire   +1 more source

Comparative economic and life cycle assessment of solar-based hydrogen production for oil and gas industries

Energy, 2020
Hydrogen is used in the petroleum industry to upgrade crude oil in refineries or as a chemical agent to produce ammonia, methanol and other products. It is mainly supplied by conventional production methods based on fossil fuels.
S. Sadeghi, S. Ghandehariun, M. Rosen
semanticscholar   +1 more source

The Periodicity of Solar Activity Cycles

Solar Physics, 1994
On the basis of published Wolf Numbers and Schove Row, solar activity cycles in the interval of 11 to hundreds of years have been investigated. In this case the method of investigation of pulsating stars showing the Blazhko effect was applied. The elements of cycles and O-C were calculated and compared with results of solar activity parameters ...
Yu. S. Romanov, N. S. Zgonyaiko
openaire   +1 more source

IS THE SOLAR ACTIVITY CYCLE SYNCHRONIZED WITH THE SOLAR INERTIAL MOTION?

International Journal of Bifurcation and Chaos, 2000
The 300 year record of the yearly sunspot numbers and numerically generated trajectory of the solar inertial motion (SIM) were subjects of a synchronization analysis. Phase synchronization of the sunspot cycle and a fast component of the SIM have been found and confirmed with statistical significance in three epochs (1727–1757, 1802–1832 and 1863–1922)
Milan Palus, Jürgen Kurths, Udo Schwarz, Dagmar Novotná, Ivanka Charvátová   +4 more
openaire   +2 more sources

Prediction of Solar Cycle Maximum Using Solar Cycle Lengths

Solar Physics, 2008
If the rise time RT, fall time FT, and total time TT (i.e., RT+FT) of a solar cycle are compared against the maximum amplitude Rz(max ) for the following cycle, then only the association between TT and Rz(max ) is inferred to be well anticorrelated, inferring that the larger (smaller) the value of Rz(max ) for the following cycle, the shorter (longer ...
openaire   +1 more source

Off-design performance of a supercritical CO2 Brayton cycle integrated with a solar power tower system

, 2020
This work focuses on the off-design performance of the system integrated a simple recuperative supercritical CO2 Brayton cycle, solar power tower, and thermal energy storage (TES).
Jingze Yang, Zhen Yang, Y. Duan
semanticscholar   +1 more source

A decade of ceria based solar thermochemical H2O/CO2 splitting cycle

International journal of hydrogen energy, 2019
Since 2006, ceria is used as a redox reactive material for production of H2, CO, and syngas via a two-step solar driven thermochemical H2O/CO2 splitting cycle.
R. Bhosale, Gorakshnath Takalkar, P. Sutar, Anand Kumar, F. Almomani, M. Khraisheh   +5 more
semanticscholar   +1 more source

Peculiar behaviour of solar cycle-23 in comparison to previous solar cycles

Indian Journal of Physics, 2012
The abrupt decrease in cosmic ray intensity and disturbances in geomagnetic field are known as Forbush decreases (FDs) and Geomagnetic storms (GSs) respectively. We have selected the number of FDs and GSs during solar cycles 20–23. It is found that the occurrence of FDs follows the sunspot cycle 23, whereas the occurrence of GSs does not follow the ...
B. N. Mishra, A. P. Mishra
openaire   +1 more source

Comparative performance assessment of solar dish assisted s-CO2 Brayton cycle using nanofluids

Applied Thermal Engineering, 2019
The recent study investigates and compares the energy and exergy performances of solar dish assisted supercritical carbon dioxide re-compression with reheat Brayton cycle.
M. S. Khan, M. Abid, H. Ali, K. P. Amber, M. A. Bashir, Samina Javed   +5 more
semanticscholar   +1 more source

System development and environmental performance analysis of a solar-driven supercritical water gasification pilot plant for hydrogen production using life cycle assessment approach

Energy Conversion and Management, 2019
Supercritical water gasification (SCWG) of biomass is a promising technology for hydrogen production. A novel pilot plant of SCWG that uses solar energy (henceforth SCWG-Solar) was constructed in State Key Laboratory of Multiphase Flow in Power ...
Jingwei Chen, Wenwen Xu, Hongyan Zuo, Xiaomin Wu, J. E., Taosheng Wang, Feng Zhang, Na Lu   +7 more
semanticscholar   +1 more source