scholarly journals Accuracy of Solar Eclipse Calculation Algorithm Based on Jet Propulsion Laboratory Data Nasa

Al-Ahkam ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 95
Author(s):  
M Basthoni
Keyword(s):  
Solar Eclipse ◽  
Laboratory Data ◽  
Average Difference ◽  
Calculation Algorithm ◽  
Jet Propulsion ◽  
Computation Algorithm ◽  
Solar Eclipses ◽  
Jet Propulsion Laboratory ◽  
The Difference

<p>DE200 and DE405 are Development Ephemeris (DE) series released by the National Aeronautics and Space Administration (NASA) in 1981 and 1997. NASA uses DE405 to predict solar eclipses in 2011-2020. While before 2011 and after 2020 NASA uses VSOP87/ELP200 theory-based DE200. Why NASA not only use more updated series DE405 and still use old release DE200? What is the difference of DE200  accuracy compared to DE405 to predict solar eclipse? This needs to be researched because the solar eclipse predicted by NASA is used as a reference by the researchers. To answer this question, this paper proposes a solar eclipse computation algorithm based on DE200 and DE405 data and the results will be compared with the results of observations of the March 9, 2016, solar eclipse that have been carried out <em>lang</em><em>it selatan</em> to find out a more accurate DE series. The results of this study indicate that the DE200 series is more accurate than DE405 with an average difference of 0.5 - 0.6 seconds with the results of observations.</p>

Looking to Mars for Mathematics Connections

2010 ◽  
Vol 104 (5) ◽  
pp. 344-349
Author(s):  
Arnold E. Perham ◽  
Faustine L. Perham
Keyword(s):  
Laboratory Data ◽  
Jet Propulsion ◽  
Kepler's Laws ◽  
Jet Propulsion Laboratory ◽  
Kepler’S Laws

Kepler's laws and beyond: Students use Jet Propulsion Laboratory data to investigate Mars and its orbit.

Sodiummetal chloride battery research at the Jet Propulsion Laboratory (JPL)

1991 ◽  
Vol 36 (3) ◽  
pp. 385-394 ◽  
Author(s):  
B.V. Ratnakumar ◽  
A.I. Attia ◽  
G. Halpert
Keyword(s):  
Metal Chloride ◽  
Jet Propulsion ◽  
Sodium Metal ◽  
Jet Propulsion Laboratory

Possible Influence of the Solar Eclipse on the Global Geomagnetic Field

2017 ◽  
Vol 13 (S335) ◽  
pp. 167-170
Author(s):  
Jung-Hee Kim ◽  
Heon-Young Chang
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Solar Eclipse ◽  
Geomagnetic Field ◽  
Geomagnetic Observatory ◽  
Geomagnetic Disturbances ◽  
Solar Eclipses ◽  
A Site

AbstractWe investigate the geomagnetic field variations recorded by INTERMAGNET geomagnetic observatories. We confirm that the effect of solar eclipse can be seen over an interval of 180 minutes centered at the time of maximum eclipse on a site of a geomagnetic observatory. It is found that the effect of the solar eclipse on the geomagnetic field becomes conspicuous as the magnitude of a solar eclipse becomes larger. The effect of solar eclipses is more evident in the second half of the path of Moon’s shadow. We also find that the effect can be overwhelmed, more sensitively by geomagnetic disturbances than by solar activity of solar cycle.

scholarly journals Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Zhou Yuhui ◽  
Hu Qingxiong ◽  
Liu Wentao ◽  
Wu Zhiqi ◽  
Yan Yule ◽  
...  
Keyword(s):  
Technical Problem ◽  
Laboratory Data ◽  
Gas Content ◽  
Formation Mechanisms ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Fluid Identification ◽  
Low Resistance ◽  
Neutron Porosity ◽  
The Difference

The Wu 2 section of the Ke017 well block is a low-resistance gas reservoir with ultralow porosity and low permeability. The comprehensive analysis of rock lithology, physical properties, sedimentary characteristics, and gas content demonstrated that the development of micropores in illite/smectite dominated clay minerals together with the resulted additional conductivity capability and complex reservoir pore structures, as well as the enrichment of self-generating conductivity minerals like zeolites and pyrite which were the formation mechanisms of low-resistance gas layers in the Wu 2 section. A low-resistance gas reservoir has poor physical property, and it is difficult to distinguish the oil layer from the dry, gas, or water layers. In this paper, based on well/mud logging data and laboratory data, by taking advantages of the “excavation effect” of neutron gas and the dual-lateral resistivity difference between different depths, we successfully established a set of low-contrast log response methods for the identification and evaluation of oil layer and formation fluids. For a gas layer, the difference between neutron porosity and acoustic (or density) porosity is smaller than 0 and the difference in dual-lateral resistivity is greater than 0. For a water layer, the neutron porosity is similar to the acoustic (or density) porosity and the dual-lateral resistivity difference will be less than 0. While for a dry layer or a layer with both gas and water, the difference in porosity as well as dual-lateral resistivity is very small. The proposed method effectively solves the technical problem of oil layer and formation fluid identification in low-resistance gas reservoirs.

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