The Comparison between Calculation Methods on the Solar Position in the Chiljeongsan Naepion and Chiljeongsan Oepion

2005 ◽  
pp. 824-830
Author(s):  
Y.S. Ahn ◽  
E.H. Lee
Keyword(s):  
Calculation Methods ◽  
Solar Position

The Comparison between Calculation Methods on the Solar Position in the Chiljeongsan Naepion and Chiljeongsan Oepion

2005 ◽  
Vol 277-279 ◽  
pp. 824-830
Author(s):  
Y.S. Ahn ◽  
E.H. Lee
Keyword(s):  
The Other ◽  
Calculation Methods ◽  
15Th Century ◽  
Other Hand ◽  
Solar Position

The Chiljeongsan Naepion (七政算內篇) and the Chiljeongsan Oepion (七政算外篇), landmark achievements in the field of astronomical calendars in Korea, were published in the 26th year (1444 A.D.) of the reign of King Sejong (世宗, 1418-1450 A.D.) of the Choseon(朝鮮) dynasty, firmly establishing the calendar making system of Choseon. The Chiljeongsan Naepion adopts the conventions of the Shoushi calendar (授時曆) of the Yuan (元) dynasty (1280-1367 A.D.) of China, but also consults the Datong calendar (大統曆) and the modified Datong-li Tongkue (大統曆通軌), published during the Ming(明) dynasty (1368-1643 A.D.) of China. Furthermore, the Chiljeongsan Naepion corrects errors in the referred Chinese calendars and adds calculations of sunrise and sunset at the latitude of Seoul. On the other hand, the Chiljeongsan Oepion adopts the conventions of the Huihui calendar (回回曆) of Arabia translated and edited by the Arabian astronomer Mashayihei (馬沙亦黑) [1] in China. The Huihui calendar uses an Islamic theory of epicycles for its treatment of lunar and planetary motions. This means that aspects of the Ptolemaic system had been introduced into the Korean astronomy in the 15th century The calendar of the Choseon dynasty was made by the method of Chiljeongsan Naepion, but the calculations of solar and lunar eclipses and five planet’s positions are compared to those of the Chiljeongsan Oepion. In this paper, we discussed mainly the differences of the calculation methods of the solar positions in both calendars.

scholarly journals Influence of Solar Position Calculation Methods Applied to Horizontal Single-Axis Solar Trackers on Energy Generation

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3826
Author(s):  
Karen Barbosa de Melo ◽  
Hugo Soeiro Moreira ◽  
Marcelo Gradella Villalva
Keyword(s):  
Energy Generation ◽  
Energy Conversion Efficiency ◽  
Photovoltaic Systems ◽  
Critical Factors ◽  
Calculation Methods ◽  
Photovoltaic Panels ◽  
Solar Tracking ◽  
Photovoltaic Plants ◽  
Solar Position ◽  
Tracking Strategy

Photovoltaic systems have been explored as a solution to meet the growing demand for electricity from a clean and renewable source. However, the low energy conversion efficiency of photovoltaic panels is one of the critical factors that hinder the competitiveness of this energy source concerning the others. An effective way to improve the efficiency of photovoltaic systems is by using solar trackers. The tracking strategy most used in photovoltaic plants employs algorithms to calculate the Sun position. This work presents energy generation estimation applying six algorithms in horizontal single-axis solar tracking: the Solar Position Algorithm (SPA) and Grena 1–5 algorithms. The aim is to evaluate the influence of these algorithms on energy generation. For all simulated locations, comparing to an ideal scenario, the SPA presented the best energy generation results. However, the other algorithms showed negligible differences between themselves, which allows us to conclude that any of the algorithms can be used without implying significant energy losses. Thus, Grena 1–2 can be highlighted for easier implementation.

Challenges of the Crisis: How to Measure Sustainable Development?

2015 ◽  
pp. 147-160 ◽  
Author(s):  
S. Bobylev ◽  
N. Zubarevich ◽  
S. Solovyeva
Keyword(s):  
Sustainable Development ◽  
World Bank ◽  
Environmental Indicators ◽  
Calculation Methods ◽  
Basic Principles ◽  
The Sustainable Development ◽  
Development Index ◽  
Development Indicators ◽  
Sustainable Development Indicators ◽  
Adjusted Net Savings

The article emphasizes the fact that traditional socio-economic indicators do not reflect the challenges of sustainable development adequately, and this is particularly true for the widely-used GDP indicator. In this connection the elaboration of sustainable development indicators is needed, taking into account economic, social and environmental factors. For Russia, adaptation and use of concepts and basic principles of calculation methods for adjusted net savings index (World Bank) and human development index (UNDP) as integral indicators can be promising. The authors have developed the sustainable development index for Russia, which aggregates and allows taking into account balanced economic, social and environmental indicators.

COMPARATIVE ANALYSIS OF EQUILIBRIUM BEACH PROFILE CALCULATION METHODS

2015 ◽  
pp. 39
Author(s):  
A. L. Khomchanovsky ◽  
E. A. Fedorova ◽  
An. A. Lygin ◽  
A. Sh. Khabidov
Keyword(s):  
Comparative Analysis ◽  
Calculation Methods ◽  
Beach Profile ◽  
Equilibrium Beach Profile

CLB18: A New Structural Database with Unusual Carbon–Carbon Long Bonds

2020 ◽  
Author(s):  
Pierpaolo Morgante ◽  
Roberto Peverati
Keyword(s):  
Transition Metal Complexes ◽  
Low Cost ◽  
Geometry Optimization ◽  
Structure Calculation ◽  
Unique Property ◽  
Spin States ◽  
Calculation Methods ◽  
Large Molecules ◽  
Barrier Heights ◽  
Structural Database

<div><div><div><p>In this Letter, we introduce a new database called carbon long bond 18 (CLB18), composed of 18 structures with one long C–C bond. We use this new database to evaluate the performance of several low-cost methods commonly used for geometry optimization of medium and large molecules. We found that the long bonds in CLB18 are electronically different from those found in barrier heights databases. We also report the unexpected correlation between the results of CLB18 and those of the energetics of spin states in transition-metal complexes. Given this unique property, CLB18 can be a useful tool for assessing existing electronic structure calculation methods and developing new ones.</p></div></div></div>

Computational and experimental studies of the strength of full-scale samples of pipes with defects "metal loss" and "dent with groove"

2020 ◽  
Vol 10 (3) ◽  
pp. 226-233
Author(s):  
Dmitry A. Neganov ◽  
◽  
Victor M. Varshitsky ◽  
Andrey A. Belkin ◽  
◽  
...  
Keyword(s):  
Internal Pressure ◽  
Experimental Studies ◽  
Full Scale ◽  
The Other ◽  
Metal Loss ◽  
Calculation Methods ◽  
Reliable Operation ◽  
Sufficient Stability ◽  
Comparative Results ◽  
The Moment

The article contains the comparative results of the experimental and calculated research of the strength of a pipeline with such defects as “metal loss” and “dent with groove”. Two coils with diameter of 820 mm and the thickness of 9 mm of 19G steel were used for full-scale pipe sample production. One of the coils was intentionally damaged by machining, which resulted in “metal loss” defect, the other one was dented (by press machine) and got groove mark (by chisel). The testing of pipe samples was performed by applying static internal pressure to the moment of collapse. The calculation of deterioration pressure was carried out with the use of national and foreign methodical approaches. The calculated values of collapsing pressure for the pipe with loss of metal mainly coincided with the calculation experiment results based on Russian method and ASME B31G. In case of pipe with dent and groove the calculated value of collapsing pressure demonstrated greater coincidence with Russian method and to a lesser extent with API 579/ASME FFS-1. In whole, all calculation methods demonstrate sufficient stability of results, which provides reliable operation of pipelines with defects.

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