scholarly journals Evolution of the Selenopotential Model and Its Effects on the Propagation Accuracy of Orbits around the Moon

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Young-Joo Song ◽  
Young-Rok Kim ◽  
Jonghee Bae ◽  
Bang-Yeop Kim
Keyword(s):  
Current Work ◽  
Mission Design ◽  
The Moon ◽  
Force Modeling ◽  
Budget Analysis ◽  
Practical Guidelines ◽  
History Of ◽  
Scientific Results ◽  
Orbiting Spacecraft ◽  
Mission Operations

The current work analyzes the effect of applying different selenopotential models to the propagation of a lunar orbiting spacecraft. A brief evolution history of the selenopotential model is first presented; then, four representative selenopotential models are selected for force modeling. Expected propagation errors are presented with respect to three different circular polar orbits around the Moon. As a result, an expected but rather significant number of orbit propagation errors are discovered. Compared to the solutions obtained using the GRAIL1500E model, the overall 3D propagation errors for a 4-day period could reach up to several tens of kilometers (50 km altitude case with the GLGM2 model) and up to several hundreds of meters (50, 100, and 200 km altitude cases even with the GRAIL660B model). For each different orbiter’s altitude, the appropriate ranges of the degree and order of the gravitational harmonic coefficients are also suggested to yield the best propagation performances with respect to the performance obtained with the full harmonic coefficients using the GRAIL1500E model. The results of the current work are expected to serve as practical guidelines for the field of system budget analysis, mission design, mission operations, and the analysis of scientific results.

Female Christian prose today: A failed search for new women’s subjectivity?

2020 ◽  
Vol 1 (1) ◽  
pp. 132-149
Author(s):  
E. Chelpanova
Keyword(s):  
Social Context ◽  
Social System ◽  
Family Values ◽  
The State ◽  
Current Work ◽  
Conservative Approach ◽  
Female Subjectivity ◽  
Female Characters ◽  
The Social ◽  
History Of

In her analysis of books by Maya Kucherskaya, Olesya Nikolaeva, and Yulia Voznesenskaya, the author investigates the history of female Christian prose from the 1990s until the present day. According to the author, it was in the 1990s, the period of crisis and transformation of the social system, that female Christian writers were more vocal, than today, on the issues of the new post-Soviet female subjectivity, drawing on folklore imagery and contrasting the folk, pagan philosophy with the Christian one, defined by an established set of rules and limitations for the principal female roles. Thus, the folklore elements in Kucherskaya’s early works are considered as an attempt to represent female subjectivity. However, the author argues that, in their current work, Kucherskaya and other representatives of the so-called female Christian prose tend to choose different, objectivizing methods to represent female characters. This new and conservative approach may have come from a wider social context, including the state-imposed ‘family values’ program.

Moving Past the ABCs of Time

2017 ◽  
Author(s):  
Craig Callender
Keyword(s):  
Analytic Philosophy ◽  
Philosophy Of Time ◽  
Safety Zone ◽  
History Of ◽  
Traditional Work ◽  
Scientific Results ◽  
Analytic Metaphysics

How do the views developed in this book connect with traditional work in analytic metaphysics on time? After giving a potted history of the field, the chapter then displays many connections and modifications between that work and the present one. It highlights one major problem with traditional analytic philosophy of time, namely, its focus on bare existence, i.e., what events exist as of when. Almost by definition, existence will play no role in science, so philosophy of time will never be threatened by scientific results. The irony about this maneuver is that creating this safety zone around time leaves philosophers of time unable to do their original job, explaining the temporal phenomena.

Early accretional history of the Earth and the Moon-forming event

Lithos ◽  
1993 ◽  
Vol 30 (3-4) ◽  
pp. 207-221 ◽  
Author(s):  
Stuart Ross Taylor
Keyword(s):  
The Moon ◽  
The Earth ◽  
History Of

A Brief History of the Moon

1972 ◽  
Vol 24 (3) ◽  
pp. 72
Author(s):  
John Skoyles
Keyword(s):  
The Moon ◽  
History Of

Dubrovnik Republic in Russian Historiography in the 19th — the Beginning of the 20th Century

Istoriya ◽  
2021 ◽  
Vol 12 (9 (107)) ◽  
pp. 0
Author(s):  
Irina Vorobyova
Keyword(s):  
20Th Century ◽  
Urban Studies ◽  
Initial Period ◽  
Medieval History ◽  
European Cities ◽  
History Of ◽  
Imaginative Literature ◽  
Urban Problems ◽  
Scientific Results

This article concerns the initial period of the phenomena of Dubrovnik Republic, who kept its independence during centuries in the alien ethnic and confessional surroundings. This item seldom appeared in the sphere of attention of the specialists upon the European urban studies. The historian V. V. Makushev (1837—1883), being at the diplomatic service in Dubrovnik, studied the resources and published the scientific results in his articles and monographs. He created his author classification of the sources of the urban problems, evaluated their informational  capability, proved the historical value of the imaginative literature. This approach is actual for the analysis of the medieval history of the Mediterranean and other European cities.

The history of the core dynamos of Mars and the Moon inferred from their crustal magnetization: a brief review

2019 ◽  
Vol 56 (9) ◽  
pp. 917-931
Author(s):  
Jafar Arkani-Hamed
Keyword(s):  
The Moon ◽  
Positive Mass ◽  
Polar Wander ◽  
The Core ◽  
True Polar Wander ◽  
History Of ◽  
Giant Impacts ◽  
Crustal Magnetization ◽  
Multiple Impact ◽  
Thermochemical Convection

The core dynamos of Mars and the Moon have distinctly different histories. Mars had no core dynamo at the end of accretion. It took ∼100 Myr for the core to create a strong dynamo that magnetized the martian crust. Giant impacts during 4.2–4.0 Ga crippled the core dynamo intermittently until a thick stagnant lithosphere developed on the surface and reduced the heat flux at the core–mantle boundary, killing the dynamo at ∼3.8 Ga. On the other hand, the Moon had a strong core dynamo at the end of accretion that lasted ∼100 Myr and magnetized its primordial crust. Either precession of the core or thermochemical convection in the mantle or chemical convection in the core created a strong core dynamo that magnetized the sources of the isolated magnetic anomalies in later times. Mars and the Moon indicate dynamo reversals and true polar wander. The polar wander of the Moon is easier to explain compared to that of Mars. It was initiated by the mass deficiency at South Pole Aitken basin, which moved the basin southward by ∼68° relative to the dipole axis of the core field. The formation of mascon maria at later times introduced positive mass anomalies at the surface, forcing the Moon to make an additional ∼52° degree polar wander. Interaction of multiple impact shock waves with the dynamo, the abrupt angular momentum transfer to the mantle by the impactors, and the global overturn of the core after each impact were probably the factors causing the dynamo reversal.

scholarly journals Social Psychology and Social Justice: Dilemmas, Dynamics, and Destinies

2017 ◽  
Author(s):  
Kenneth J. Gergen
Keyword(s):  
Social Psychology ◽  
Social Justice ◽  
Current Work ◽  
Value Pluralism ◽  
History Of

The emergence of this handbook on social justice represents a groundbreaking event in the history of social psychology. In this summary discussion, I outline significant limits to social justice work embedded in the empiricist tradition of inquiry and point to ways in which the current work transcends these limits. However, I also view the present endeavors as in a fledgling state. In the service of enriching and rendering these pursuits more effective, I discuss five domains in which tensions currently prevail and suggest directions for future undertakings. Challenges are discussed in terms of epistemological schisms, presumed ontologies, value pluralism, explanatory paradigms, and the limits of representationalism. A final invitation is made to shift from a mirroring orientation to research to world-making.

The Mausoleum of Youth: Between Experience and Nihilism in Benjamin's Berlin Childhood

Paragraph ◽  
2009 ◽  
Vol 32 (3) ◽  
pp. 313-330 ◽  
Author(s):  
Michael W. Jennings
Keyword(s):  
Human Experience ◽  
The Moon ◽  
History Of Photography ◽  
Work Of Art ◽  
Modern Media ◽  
Siegfried Kracauer ◽  
History Of ◽  
The Relationship

Key sections of Walter Benjamin's montage-text Berlin Childhood around 1900 figure the relationship between human experience and modern media, with the sections that frame the text, ‘Loggias’ and ‘The Moon’, structured around metaphors of photography. Drawing on the work of Siegfried Kracauer, and especially his seminal essay ‘Photography’, Benjamin develops, in the course of his book, a theory of photography's relationship to experience that runs counter to the better-known theories developed in such essays as ‘Little History of Photography’ and ‘The Work of Art in the Age of its Technological Reproducibility’, theories that are part of the broad currents of technological utopianism and, as such, emphasize photography's transformative potentials. In the Berlin Childhood, Benjamin instead emphasizes photography's role in the mortification and annihilation of meaningful human experience. Photography emerges here as the mausoleum of youth and hope.

INTRODUCTION

2007 ◽  
Vol 18 (1) ◽  
pp. 107-108 ◽  
Author(s):  
William R. Fowler
Keyword(s):  
Urban Landscape ◽  
Special Section ◽  
Third Century ◽  
The Sun ◽  
Urban Archaeology ◽  
The Moon ◽  
History Of ◽  
The Temple

This is the twenty-fifth Special Section published in Ancient Mesoamerica, and therefore it represents something of a milestone in the history of the journal. The goal has been to present in each special section a collection of related papers from a single project or region or on a selected topic to provide readers a tightly integrated summary of current research and interpretations. Certainly one of the most compelling and provocative special sections we have published was “Urban Archaeology at Teotihuacan” which appeared in vol. 2, no. 1 (1991). This collection of papers featured two stunning articles on the Feathered Serpent Pyramid, then often referred to as the Temple of Quetzalcoatl. Constructed in the early third century A.D., the Feathered Serpent Pyramid, along with the Sun Pyramid and the Moon Pyramid, was one of the three most powerful monuments in the sacred urban landscape of Teotihuacan. Rubén Cabrera Castro, Saburo Sugiyama, and George L. Cowgill (1991) reported on excavations in the 1980s of the Feathered Serpent Pyramid and the investigation of more than 137 sacrificial burials, including more than 70 males identified as soldiers because of associated offerings, discovered at the base of and underneath the pyramid. In the second article, Alfredo López Austin, Leonardo López Luján, and Saburo Sugiyama (1991) presented their brilliant iconographic analysis of the sculptural facades of the Feathered Serpent Pyramid, arguing that the monumental structure was dedicated to the myth of the origin of time and calendric succession, a tangible cosmogonic proclamation that Teotihuacan was “the place where time began.”

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