The Form of the Good I

2017 ◽  
Author(s):  
Andrew Payne
Keyword(s):  
The Sun

This chapter discusses the premise that understanding the Form of the Good is the unintended end or purpose of philosophic inquiry in the sense of Plato’s functional teleology of action. It begins the presentation of this theme by introducing the three images that Socrates uses to convey his beliefs about the Form of the Good: the Sun, the Divided Line, and the Cave. A motif common to these images is the role of vision as an analogue to knowledge. Plato’s theory of vision in the Timaeus is examined in detail. The image of the Divided Line in particular conveys the thought that we exercise vision for the sake of directing our thought toward intelligible objects. The present chapter concludes with an overview of the comparison Plato frequently employs between vision and knowledge.

The role of science in the study of and response to space threats

2019 ◽  
Vol 89 (8) ◽  
pp. 777-799
Author(s):  
B. M. Shustov
Keyword(s):  
Comparative Analysis ◽  
20Th Century ◽  
21St Century ◽  
Space Debris ◽  
The Sun ◽  
National Program ◽  
Biological Hazard ◽  
Academy Of Sciences ◽  
Space Activities

During the second half of the 20th century and the beginning of the 21st century, space hazards multiplied, the most urgent of which is space debris. Professionals working in space are exposed to this hazard daily and are aware of it as a problem. Furthermore, increasing attention is being paid to the unpredictable behavior of the Sun, which produces the so-called space weather. The asteroid-comet hazard is considered as potentially having the most catastrophic consequences. No manifestations of biological hazard have yet been observed, although as space activities develop, it is becoming increasingly important. The appropriate time scale for astrophysical hazards is many millions of years, so from a practical perspective, they have no importance. This article briefly describes the main types of space hazards. The author analyzes the results of research and practical work in the field, both worldwide and specifically in Russia. Comparative analysis leads to the clear conclusion that a national program must be developed for the study of space hazards and to respond to space threats. This article is based on a report made by the author at the meeting of the Presidium of the Russian Academy of Sciences (RAS) on January 15, 2019.

 Statistical study of CMEs, lateral overexpansion and SEP events

2021 ◽  
Author(s):  
Alexandros Adamis ◽  
Astrid Veronig ◽  
Tatiana Podladchikova ◽  
Karin Dissauer ◽  
Rositsa Miteva ◽  
...  
Keyword(s):  
Statistical Study ◽  
Solar Energetic Particle ◽  
Early Evolution ◽  
Point Of View ◽  
Time Range ◽  
The Sun ◽  
Lateral Expansion ◽  
Time Profiles ◽  
Angular Expansion

<p><strong>We present a statistical study on the early evolution of coronal mass ejections (CMEs), to better understand the effect of CME (over)- expansion and how it relates to the production of Solar Energetic Particle (SEP) events. We study the kinematic CME characteristics in terms of their radial and lateral expansion, from their early evolution in the Sun’s atmosphere as observed in EUV imagers and coronagraphs. The data covers 72 CMEs that occurred in the time range of July 2010 to September 2012, where the twin STEREO spacecraft where in quasiquadrature </strong><strong>to the Sun-Earth line. From the STEREO point-of-view, the CMEs under study were observed close to the limb. We calculated the radial and lateral height (width) versus time profiles and derived the corresponding peak and mean velocities, accelerations, and angular expansion rates, with particular emphasis on the role of potential lateral overexpansion in the early CME evolution. We find high correlations between the radial and lateral CME velocities and accelerations. CMEs that are associated tend to be located at the high-value end of the distributions of velocities, widths, and expansion rates compared to nonSEP associated events.<br></strong></p>

The Role of Chlorine in Stratospheric Chemistry

1996 ◽  
Vol 68 (9) ◽  
pp. 1749-1756 ◽  
Author(s):  
M. J. Molina
Keyword(s):  
Laboratory Experiments ◽  
Stratospheric Ozone ◽  
The Sun ◽  
Plastic Foam ◽  
Model Calculations ◽  
Stratospheric Chemistry ◽  
Blowing Agents ◽  
Stratospheric Ozone Layer ◽  
The Earth

The chlorofluorocarbons (CFCs) are industrialchemicals used as solvents, refrigerants, plastic foam blowing agents,etc. These compounds are eventually released to the environment; theyslowly drift into the stratosphere, where they decompose, initiatinga catalytic process involving chlorine free radicals and leading toozone destruction. The stratospheric ozone layer is important for theearth's energy budget, and it shields the surface of the earth fromultraviolet radiation from the sun. Very significant depletion of theozone layer has been observed in the spring months over Antarctica duringthe last 10-15 years. Laboratory experiments, model calculations andfield measurements, which include several aircraft expeditions, haveyielded a wealth of information which clearly points to the CFCs asthe main cause of this depletion.

scholarly journals La magie du temps et des saisons dans la dramaturgie de Paul Willems

2021 ◽  
Vol 48 (1) ◽  
pp. 105-117
Author(s):  
Renata Jakubczuk
Keyword(s):  
The Sun ◽  
Dramatic Works ◽  
Current Article ◽  
Basic Hypothesis

In the current article we are examining the presence, importance and significance of weather and seasons in dramatic works of the Belgian writer, Paul Willems. Our study relies upon the methodology of patternsof transitivity proposed by Jean-Pierre Richard. After explaining the principals of our approach, then presenting the corpus of the studied texts and formulating our basic hypothesis concerning the weather, we are reviewing four weather phenomena: the rain, the wind, the snow, and the sun. The completedanalysis confirmed the calming role of the rain, the soothing role of the sun and the warning role of the wind. However, we realized, besides the liberating role of the snow in the introduction, its more complex significance because it “weighs heavily” on the life of the characters.

scholarly journals Peranan Simbol Benda-Benda Langit Dalam Perkembangan Religi Masyarakat Di Indonesia

1999 ◽  
Vol 19 (1) ◽  
pp. 66-77
Author(s):  
Nfn. Hartatik
Keyword(s):  
The Sun ◽  
Global Function ◽  
Celestial Bodies ◽  
Ethnographic Data ◽  
Rock Paintings

Celestial objects are always present in the form of symbols depicted in rock paintings, nekara, megalithic concepts, symbols of royal triumph and in conventional myths as can be found in the ethnographic data of several tribes in Indonesia. In general, celestial bodies, especially the sun, moon and stars are symbols whose rays are considered to be the source of life, the light of truth and justice that are expected to be able to illuminate mankind. In their development, the role of celestial bodies has shifted from a religious function to a global function that tends to be profane, which includes social and political functions. However, the presence of a symbol representing an infinite character always exists as a generator of feelings of togetherness and a deeper attachment than just a verbal formulation.

MEASURING SOLAR DIAMETER WITH 2012 VENUS TRANSITS

2013 ◽  
Vol 23 ◽  
pp. 451-453 ◽  
Author(s):  
COSTANTINO SIGISMONDI
Keyword(s):  
Past History ◽  
Logarithmic Derivative ◽  
Solar Limb ◽  
Absolute Calibration ◽  
The Sun ◽  
Solar Diameter ◽  
The Past ◽  
History Of ◽  
Better Than

The role of Venus and Mercury transits is crucial to know the past history of the solar diameter. Through the W parameter, the logarithmic derivative of the radius with respect to the luminosity, the past values of the solar luminosity can be recovered. The black drop phenomenon affects the evaluation of the instants of internal and external contacts between the planetary disk and the solar limb. With these observed instants compared with the ephemerides the value of the solar diameter is recovered. The black drop and seeing effects are overcome with two fitting circles, to Venus and to the Sun, drawn in the undistorted part of the image. The corrections of ephemerides due to the atmospheric refraction will also be taken into account. The forthcoming transit of Venus will allow an accuracy on the diameter of the Sun better than 0.01 arcsec, with good images of the ingress and of the egress taken each second. Chinese solar observatories are in the optimal conditions to obtain valuable data for the measurement of the solar diameter with the Venus transit of 5/6 June 2012 with an unprecedented accuracy, and with absolute calibration given by the ephemerides.

scholarly journals About the role of environmental factors in carcinogenesis

2020 ◽  
Vol 169 ◽  
pp. 04003
Author(s):  
Sergey K. Pinaev ◽  
Olga G. Pinaeva ◽  
Alexey Ya. Chizhov
Keyword(s):  
Oxidative Stress ◽  
Environmental Factors ◽  
Young Children ◽  
Forest Fires ◽  
Malignant Neoplasms ◽  
The Sun ◽  
Child Population

There were found out the connections of the activity of the Sun and smoke of forest fires with the incidence of various forms of benign and malignant neoplasms in the population of young children 0-4 years old, in Khabarovsk Region, Russia. Thus, it was determined that so-called “sporadic” fluctuations in the incidence of neoplasms in the child population are not random. They are caused by long multi-year cycles of changes in the complex of environmental factors. The authors identified this phenomenon as “Alternative oncogenesis”, meaning by it the predominant occurrence of various forms of neoplasms in a certain period of time due to a change in the parameters of the complex of environmental factors. A proposed hypothesis is: ecologically linked oxidative stress as a cause of the epigenomic modulation leading to an imbalance between semaphorins and integrins that brings to oncogenesis.

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