scholarly journals A New Method for Observational Testing of the Planetary Nebulae Nuclei Evolution

1989 ◽  
Vol 131 ◽  
pp. 539-539
Author(s):  
R. Szczerba
Keyword(s):  
Stellar Evolution ◽  
Planetary Nebulae ◽  
Central Star ◽  
The Other ◽  
New Method ◽  
Evolutionary Status ◽  
Applied Method ◽  
Other Hand ◽  
Visual Magnitude ◽  
The Absolute

Planetary nebulae (PNe) are very useful as a tool for testing the theory of stellar evolution. The most widely applied method in this respect is the Hertzsprung-Russell (H-R) diagram. However, the observed positions of planetary nebulae nuclei (PNNi) on the H-R diagram are subject to large uncertainties, mostly due to inaccurate distances to them. On the other hand, the (absolute visual magnitude, age)-diagram also is not free of this problem. Therefore, an attempt has been done to develop a new method which is distance-independent. For comparison between theory and observations we propose the I (Hell λ 4686) /I(H β) versus log [I(H β, PN)/IC (H β, PNN)] diagram. Both ratios reflect the evolutionary status of the central star and the surrounding nebula. Consequently, such diagram is a valuable tool for studying common evolution of the PNN-PN system.

scholarly journals The Continuum Emission from Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 226-226
Author(s):  
Sueli M. Viegas-Aldrovandi
Keyword(s):  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Central Star ◽  
The Other ◽  
Continuum Emission ◽  
Other Hand ◽  
The Continuum ◽  
Hr Diagram

The study of nebular continuum emission is important for several reasons (Pottasch 1984, Planetary Nebulae, Dordrecht: Reidel). First of all, it can provide information about the temperature and the density of the nebula, when the object is large enough, or when the central star is weak enough, so that the nebular continuum is easily observed without interference from the stellar continuum. On the other hand, for small planetary nebulae, both the central star and the nebula contribute to the observed continuum. In this latter case, in order to obtain the stellar continuum the theoretical nebular emission must be used. Thus, studies of the evolution of planetary nebula nuclei through the HR diagram rely on a good calculation of the theoretical nebular continuum.

scholarly journals A new distance indicator to the Galactic Planetary Nebulae based upon IRAS Fluxes

1997 ◽  
Vol 180 ◽  
pp. 51-52
Author(s):  
A. Tajitsu ◽  
S. Tamura
Keyword(s):  
Thermal Emission ◽  
Planetary Nebulae ◽  
The Other ◽  
New Method ◽  
Dust Envelope ◽  
Other Hand ◽  
Distance Indicator

The distance to Planetary Nebulae (PNe) is a most important parameter to study their evolution and the distribution among our Galaxy, but it has been very difficult to determine it precisely. On the other hand, it is well-known that the IRAS colors of PNe are very similar to the blackbody colors. Taking into account of this characteristic, we define a new method to get some information about the distance to PNe by the blackbody fitting of IRAS 4-band fluxes, assuming these fluxes are due to the thermal emission from the nebular dust envelope.

Moderne Ikonen

2009 ◽  
Vol 54 (2) ◽  
pp. 123-143
Author(s):  
Bernadette Collenberg-Plotnikov
Keyword(s):  
Mass Culture ◽  
Visual Experience ◽  
Modern Art ◽  
The Other ◽  
Recent Discussion ◽  
Christian Church ◽  
Other Hand ◽  
The Absolute ◽  
Modern Mass

›Ikonen‹ sind heute nicht mehr nur die Ikonen der christlichen Kirche, sondern vor allem die Ikonen der modernen Massenkultur. Beide Arten von Ikonen werden in der neueren Kunstreflexion aufgegriffen: Kunst gilt entweder, verstanden als Erbin der religiösen Ikone, als Phänomen, das Absolutes in singulärer Weise anschaulich er- fahrbar macht. Oder aber die Kunst gilt umgekehrt lediglich als Klasse in der Welt der säkularen Ikonen. Demgegenüber wird im Beitrag erstens die These vertretenwerden, daß die neuere Kunst sowohl Aspekte transzendenter als auch immanenter Ikonen umfaßt. Zugleich ist es aber, so die zweite These, für unser Kunstverständnis charakteristisch, ein theoretisches Kontrastverhältnis zwischen Kunst und Ikone an- zunehmen. Dieses gründet auf einer spezifischen Reflexivität der Kunst, durch die sie sich von der Ikone beiderlei Art kategorial unterscheidet. Today, the word ›icon‹ usually no longer refers to the icons of the Christian church, but to the icons of the modern mass-culture. Both sorts of icons play a key-role in the recent discussion about art: Either art is supposed to be a descendant of the religious icon, a phenomenon that gives us a singular visual experience of the Absolute. On the other hand, art is supposed to be just one class among others in the wide world of the secular icons. In contrast to these two positions this essay contends that modern art comprehends aspects of transcendent as well as of immanent icons. Furthermore, it argues that at the same time it is characteristic for our notion of art to suppose a contrast between art and icon. This contrast is based on a specific reflectivity of art, which marks a categorical difference between art and both sorts of icons.

scholarly journals On Newcomb's method of investigating periodicities and its application to Brückner's weather cycle

1914 ◽  
Vol 90 (619) ◽  
pp. 349-355
Keyword(s):  
Thermal Radiation ◽  
The Other ◽  
New Method ◽  
Critical Examination ◽  
Numerical Work ◽  
Average Value ◽  
Other Hand ◽  
Relationship Of ◽  
The Relationship ◽  
Great Simplicity

During the last few years of his life Prof. Simon Newcomb was keenly interested in the problem of periodicities, and devised a new method for their investigation. This method is explained, and to some extent applied, in a paper entitled "A Search for Fluctuations in the Sun's Thermal Radiation through their Influence on Terrestrial Temperature." The importance of the question justifies a critical examination of the relationship of the older methods to that of Newcomb, and though I do not agree with his contention that his process gives us more than can be obtained from Fourier's analysis, it has the advantage of great simplicity in its numerical work, and should prove useful in a certain, though I am afraid, very limited field. Let f ( t ) represent a function of a variable which we may take to be the time, and let the average value of the function be zero. Newcomb examines the sum of the series f ( t 1 ) f ( t 1 + τ) + f ( t 2 ) f ( t 2 + τ) + f ( t 3 ) f ( t 3 + τ) + ..., where t 1 , t 2 , etc., are definite values of the variable which are taken to lie at equal distances from each other. If the function be periodic so as to repeat itself after an interval τ, the products are all squares and each term is positive. If, on the other hand, the periodic time be 2τ, each product will be negative and the sum itself therefore negative. It is easy to see that if τ be varied continuously the sum of the series passes through maxima and minima, and the maxima will indicated the periodic time, or any of its multiples.

scholarly journals Nietzsche’s Dionysos

2017 ◽  
Vol 3 (3) ◽  
pp. 604
Author(s):  
Dieter Mersch
Keyword(s):  
Necessary Conditions ◽  
Central Point ◽  
The Other ◽  
Other Hand ◽  
The Absolute ◽  
The Aesthetic

Nietzsche’s Dionysus, admittedly, represents a direct provocation and an attack on the classical interpretation accepted since Winckelmann, an interpretation that elevates the Apollonian to its central point of focus; Nietzsche’s introduction of another principle to oppose it, rather than representing a genuine invention, in actuality bridges the small gap between Hegel and Hölderlin. If, namely, the Hegelian aesthetic from the very beginning points to Schein and Erscheinung – as necessary conditions of truth, for the truth would not exist if it were not to “superficially appear” (scheinen) and “make its appearance” (erscheinen), writes Hegel – Schein and Erscheinung would still nonetheless be bound up everywhere with the criterium of the absolute; after all, the untruth of the aesthetic rests squarely in the fact that it cannot do other than to draw upon the language of Erscheinung. For Hölderlin, on the other hand, the Dionysian advances to become a metapoetic symbol combining itself – the enigmatic and continually transforming – with the practice of art. Nietzsche follows those very same lines even while giving the metaphor a thoroughly different twist.

scholarly journals HERMENEUTIKA SEBAGAI METODE BARU DALAM MENAFSIRKAN ALQURAN

2018 ◽  
Vol 2 (2) ◽  
pp. 159
Author(s):  
Mulizar Mulizar
Keyword(s):  
The Other ◽  
New Method ◽  
Religious Groups ◽  
Other Hand ◽  
The World ◽  
The Way

This article will discuss hermeneutics as a new method of interpreting the Qur'an.The use of hermeneutics is a new thingin the world of interpretation. Some support and some reject it.The results of this study show that the use of hermeneutics in interpreting the Qur’an must be careful.In addition, This science should be placed as a complement, not as a subdivision of the science of interpretation. On the other hand, hermeneutics paves the way to contextualize the scriptures, so that they can dialogue in different spaces and times, as apologically desirable and held by many religious groups to their respective scriptures.

Réflexions Sur la Théorie de L'article de Gustave Guillaume

1986 ◽  
Vol 10 (1) ◽  
pp. 131-151
Author(s):  
Stanislaw Karolak
Keyword(s):  
Functional Calculus ◽  
Noun Phrases ◽  
Sharp Contrast ◽  
The Other ◽  
Applied Method ◽  
Other Hand ◽  
Classical Work ◽  
Starting Point ◽  
Semantic Properties

This paper is concerned with the analysis of the theory of the French article presented in the classical work by Guillaume "Le problème de l'article et sa solution dans la langue française". The paper emphasizes Guillaume's search for the semantic nature of the relationships determining the distribution of articles. The paper supports Guillaume, who seems to claim, contrary to what is commonly believed, that the function of the articles is non inherent in them, but that it is determined by the semantic properties of the nouns which select them. Treating this claim as the starting point, the paper focuses on the analysis of various senses of noun phrases, carried out in terms of the functional calculus. The applied method invalidates the extensional theory of the noun accepted by Guillaume, as well as a number of generalisations made by him. The paper shows logical and semantic conditions of some rules governing the use of the article. They differ from those proposed by Guillaume in that they seem to reach a deeper level of linguistic mechanisms. On the other hand, the emphasis is laid on Guillaume's subtle analysis and detailed observations, which stand in a sharp contrast to his rather vague generalizations.

Gravidanotherapy

1934 ◽  
Vol 30 (11-12) ◽  
pp. 1078-1090
Author(s):  
M. E. Vinnikov
Keyword(s):  
Human Body ◽  
Experimental Verification ◽  
Well Being ◽  
Modern Medicine ◽  
The Other ◽  
New Method ◽  
Subjective Improvement ◽  
Clinical Observations ◽  
Other Hand ◽  
Methods Of Treatment

As any new method of treatment, gravidanotherapy is met with varying opinions. Some expect "miracles" from this method of treatment, believing that gravidanotherapy has found a new all-encompassing, excluding all other methods of treatment. On the other hand, there is an undeniable tendency to downplay or even completely deny the importance of gravidanotherapy. Finally, some authors consider gravidanotherapy as a method giving only subjective improvement of patients' well-being, the success of which is based on mass psychotherapy. Meanwhile, there is no doubt that gravidan, given its composition, should have a significant effect on the human body. It is only necessary that clinical observations and experimental verification give an unbiased assessment of the action of the drug and determine the place of gravidanotherapy in the arsenal of means of modern medicine.

scholarly journals Effects of Atmospheric Absorption of Incoming Radiation on the Radiation Limit of the Troposphere

2012 ◽  
Vol 69 (1) ◽  
pp. 403-413 ◽  
Author(s):  
Hiroyuki Kurokawa ◽  
Taishi Nakamoto
Keyword(s):  
Longwave Radiation ◽  
Central Star ◽  
Atmospheric Model ◽  
Upper Atmosphere ◽  
The Other ◽  
Shortwave Radiation ◽  
Atmospheric Absorption ◽  
Incoming Radiation ◽  
Other Hand ◽  
No Absorption

Abstract The limit of the planetary radiation (longwave radiation) of a planet with oceans on its surface is determined by various mechanisms called “radiation limits,” which can be classified as the Komabayashi–Ingersoll limit and the radiation limit of the troposphere. The effects of atmospheric absorption of the incoming central star radiation (shortwave radiation) on the radiation limit of the troposphere are investigated. To clarify the effects, simple parameterization of the absorption is performed. Two cases are found using an atmospheric model without a window for the longwave radiation. When the absorption in the upper atmosphere is effective, the radiation limit becomes larger than in the no-absorption case. On the other hand, the radiation limit disappears in the absence of a window for the incoming radiation.

scholarly journals Historical overview of planetary nebulae research

2011 ◽  
Vol 7 (S283) ◽  
pp. 1-8
Author(s):  
Sun Kwok
Keyword(s):  
Planetary Nebulae ◽  
Central Star ◽  
Asymptotic Giant Branch ◽  
Evolutionary Status ◽  
Complex Molecules ◽  
Chemical Enrichment ◽  
Star Studies ◽  
The Galaxy ◽  
Underlying Causes

AbstractPlanetary nebulae (PNs) were first discovered over 200 years ago and our understanding of these objects has undergone significant evolution over the years. Developments in astronomical optical spectroscopy and atomic physics have shown that PNe are gaseous objects photoionized by UV radiation from a hot central star. Studies of the kinematics of the nebulae coupled with progress in theories of stellar evolution have led to the identification that PNe are evolved stars and progenitors of white dwarfs. Development of infrared and millimeter-wave technology in the 1970s made us realize that there is significant amount of neutral matter (molecules and dust) in PNe. The link of PNe to the stellar winds from their progenitor asymptotic giant branch (AGB) stars and subsequent dynamical interactions are now believed to be the underlying causes of the morphological structures of PNe. The role of PNe as prolific molecular factories producing complex molecules and organic solids has significant implications on the chemical enrichment of the Galaxy.In this paper, we discuss the misconceptions and errors that we have encountered in our journey of understanding the nature of PN. The various detours and dead ends that had happened during our quest to pin down the evolutionary status and causes of nebulae ejection will be discussed. As there are still many unsolved problems in PN research, these lessons of history have much to offer for future progress in this field.

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