scholarly journals On the boundaries of a convective zone and the extent of overshooting

2008 ◽  
Vol 4 (S252) ◽  
pp. 83-88 ◽  
Author(s):  
L. Deng ◽  
D. R. Xiong
Keyword(s):  
Temperature Gradient ◽  
Energy Flux ◽  
Stellar Evolution ◽  
Convective Zone ◽  
Unstable Region ◽  
Temperature Changes ◽  
Proper Definition ◽  
Definition Of ◽  
Physical Quantities ◽  
Adiabatic Temperature Gradient

AbstractIn this work, we will show that a proper definition of the boundary of a convective zone should be the place where the convective energy flux (i.e. the correlation of turbulent velocity and temperature) changes its sign. Therefore, it is convectively unstable region when the flux is positive, and it is convective overshooting zone when the flux becomes negative. In our nonlocal convection theory, convection is already sub-adiabatic (∇ < ∇ad) far before reaching the unstable boundary; while in the overshooting zone below the convective zone, convection is sub-adiabatic and super-radiative (∇rad < ∇ < ∇ad). The transition between the adiabatic temperature gradient and the radiative one is continuous and smooth instead of a sudden switch. In the unstable zone, the temperature gradient is approaching radiative rather than going to adiabatic. The distance of convective overshooting is different for different physical quantities. The overshooting distance in the context of stellar evolution, measured by the extent of mixing of stellar matter, should be more extended than that of other physical quantities. It is estimated as large as 0.25–1.7 Hp depending on the evolutionary timescale.

Simultaneous heat and mass transfer during evaporation from a film of liquid into the turbulent gas

1982 ◽  
Vol 47 (3) ◽  
pp. 766-775 ◽  
Author(s):  
Václav Kolář ◽  
Jan Červenka
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Driving Forces ◽  
Proper Definition ◽  
Definition Of ◽  
Simultaneous Heat ◽  
Theory And Experiment

The paper presents results obtained by processing a series of published experimental data on heat and mass transfer during evaporation of pure liquids from the free board of a liquid film into the turbulent gas phone. The data has been processed on the basis of the earlier theory of mechanism of heat and mass transfer. In spite of the fact that this process exhibits a strong Stefan's flow, the results indicate that with a proper definition of the driving forces the agreement between theory and experiment is very good.

WoCoVA consensus on the clinical use of in-line filtration during intravenous infusions: Current evidence and recommendations for future research

2021 ◽  
pp. 112972982198916
Author(s):  
Ton Van Boxtel ◽  
Mauro Pittiruti ◽  
Annemarie Arkema ◽  
Patrick Ball ◽  
Giovanni Barone ◽  
...  
Keyword(s):  
Potential Benefit ◽  
Scientific Evidence ◽  
Venous Access ◽  
Current Evidence ◽  
Future Research ◽  
Global Awareness ◽  
Current State ◽  
Intravenous Infusions ◽  
Proper Definition ◽  
Definition Of

The need for filtering intravenous infusions has long been recognized in the field of venous access, though hard scientific evidence about the actual indications for in-line filters has been scarce. In the last few years, several papers and a few clinical studies have raised again this issue, suggesting that the time has come for a proper definition of the type of filtration, of its potential benefit, and of its proper indications in clinical practice. The WoCoVA Foundation, whose goal is to increase the global awareness on the risk of intravenous access and on patients’ safety, developed the project of a consensus on intravenous filtration. A panel of experts in different aspects of intravenous infusion was chosen to express the current state of knowledge about filtration and to indicate the direction of future research in this field. The present document reports the final conclusions of the panel.

scholarly journals Storm Energy Flux Characterization along the Mediterranean Coast of Andalusia (Spain)

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 509 ◽  
Author(s):  
Rosa Molina ◽  
Giorgio Manno ◽  
Carlo Lo Re ◽  
Giorgio Anfuso ◽  
Giuseppe Ciraolo
Keyword(s):  
Energy Flux ◽  
Wave Climate ◽  
Mediterranean Coast ◽  
Storm Events ◽  
Cumulative Energy ◽  
Weather Forecasts ◽  
Wave Energy Flux ◽  
The Mediterranean ◽  
Definition Of ◽  
Storm Characteristics

This paper investigates wave climate and storm characteristics along the Mediterranean coast of Andalusia, for the period 1979–2014, by means of the analysis of wave data on four prediction points obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF). Normally, to characterize storms, researchers use the so-called “power index”. In this paper, a different approach was adopted based on the assessment of the wave energy flux of each storm, using a robust definition of sea storm. During the investigated period, a total of 2961 storm events were recorded. They were classified by means of their associated energy flux into five classes, from low- (Class I) to high-energetic (Class V). Each point showed a different behavior in terms of energy, number, and duration of storms. Nine stormy years, i.e., years with a high cumulative energy, were recorded in 1980, 1983, 1990, 1992, 1995, 2001, 2008, 2010, and 2013.

Artificially making Lifeform

2021 ◽  
Vol 9 (10) ◽  
pp. 1290-1295
Author(s):  
Souvik Das
Keyword(s):  
Medical Community ◽  
Programming Algorithm ◽  
The Public ◽  
For Profit ◽  
Not For Profit ◽  
Funding Agencies ◽  
Proper Definition ◽  
Inanimate Matter ◽  
Living Organisms ◽  
Definition Of

Abstract: The word ‘life’ is a mysterious word with a chart of attributes that have neither been completed nor has been agreed upon by the race of humans. Probably the proper definition of life is impossible to identify for humans (the proof for this claim is given later) but the handbook to the secret shall be updated till the end, thanks to the inquisitive attitude of humans. For this piece, we shall adopt the description from the professional medical community of today. Though this topic falls midway between science and philosophy, this project is strictly technical. To quote dictionary.com, Life is the condition that distinguishes organisms from inorganic objects and dead organisms, being manifested by growth through metabolism, reproduction and the power of adaptation to environment- through changes originating internally; cambridge.com teaches Life is the period between birth and death, or the experience or state of being alive; medicaldictionary.thefreedictionary.com states Life is the property or quality that distinguishes living organisms from dead organisms and inanimate matter, manifested in functions such as metabolism, growth, reproduction and response to stimuli or adaptation to the environment originating from within the organisms. There are several other definitions but to summarize, we can safely state that though the concept is somewhat vague, we could indeed point out some common principles. We shall, in this project, try to replicate the characteristics so as to attain life in medical terms. (The order does not base upon importance of the listed character since the characters, all of them are absolute essentials and cannot possibly be categorized as more or less important). 1) Metabolism 2) Growth 3) Adaptability 4) Birth 5) Death 6) Self-stimulated response to environment 7) Reproduction 8) Can sustain self without foreign intervention Keywords: artificial, life, intelligence, computer, programming, algorithm This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Temperature in the external auditory meatus as an index of central temperature changes

1964 ◽  
Vol 19 (5) ◽  
pp. 1032-1034 ◽  
Author(s):  
K. E. Cooper ◽  
W. I. Cranston ◽  
E. S. Snell
Keyword(s):  
Temperature Gradient ◽  
Temperature Regulation ◽  
External Auditory Meatus ◽  
Absolute Temperature ◽  
Central Temperature ◽  
Temperature Changes ◽  
Vasomotor Responses ◽  
Temperature Levels

The temperature of the wall of the external auditory meatus has been investigated. Changes in ear temperature reflect changes of sublingual temperature quite accurately and are well correlated with cutaneous vasomotor responses induced by body heating. The temperature of the external auditory meatus is little affected by reflex vasomotor changes. It is easily measured without discomfort or danger and provides a valid indication of temperature changes at the central receptors. There is a considerable temperature gradient down the wall of the meatus so that absolute temperature levels are probably not of value. ear temperature in man; central temperature regulation in man Submitted on February 24, 1964

scholarly journals Angular Vectors in the Theory of Vectors

2017 ◽  
Vol 9 (5) ◽  
pp. 71
Author(s):  
Yevhen Mykolayovych Kharchenko
Keyword(s):  
Angular Velocity ◽  
Cross Product ◽  
Vector Form ◽  
Coordinate Vector ◽  
The Cross ◽  
Definition Of ◽  
Physical Quantities

The theory of angular vectors, which allows modelling of the properties of angular physical quantities, is considered. The meaning of the cross product of vectors was radically revised and changed. Formulas for finding torque and angular velocity in a coordinate-vector form with a correct mapping of their directions were deduced. Described definition of the inverse vector and its properties. The inversed vector allows us to perform vector division operations.

scholarly journals 19. Convection Zones and Coronae of White Dwarfs

1971 ◽  
Vol 42 ◽  
pp. 130-135 ◽  
Author(s):  
K. H. Böhm ◽  
J. Cassinelli
Keyword(s):  
Chemical Composition ◽  
Temperature Gradient ◽  
White Dwarf ◽  
White Dwarfs ◽  
Convection Zone ◽  
Adiabatic Temperature ◽  
Turbulent Convection ◽  
Cool White Dwarfs ◽  
Adiabatic Temperature Gradient

Outer convection zones of white dwarfs in the range 5800 K ≤ Teff ≤ 30000 K have been studied assuming that they have the same chemical composition as determined by Weidemann (1960) for van Maanen 2. Convection is important in all these stars. In white dwarfs Teff < 8000 K the adiabatic temperature gradient is strongly influenced by the pressure ionization of H, HeI and HeII which occurs within the convection zone. Partial degeneracy is also important.Convective velocities are very small for cool white dwarfs but they reach considerable values for hotter objects. For a white dwarf of Teff = 30000 K a velocity of 6.05 km/sec and an acoustic flux (generated by the turbulent convection) of 1.5 × 1011 erg cm−2 sec−1 is reached. The formation of white dwarf coronae is briefly discussed.

scholarly journals Lean & Green on Industry 4.0 Context – Contribution to Understand L&G Drivers and Design Principles

2021 ◽  
Vol 6 (5) ◽  
pp. 1214-1229
Author(s):  
Lenin John ◽  
Manuel Sampayo ◽  
Paulo Peças
Keyword(s):  
Industry 4.0 ◽  
Research Work ◽  
Design Principles ◽  
Manufacturing Companies ◽  
Bottom Line ◽  
Industrial Firms ◽  
Systems Implementation ◽  
Sustainability Concept ◽  
Proper Definition ◽  
Definition Of

The purpose of this paper is to demonstrate how the implementation of Lean & Green (L&G) in an Industry 4.0 (I4.0) environment can enhance the potential impact of the L&G approach and help manufacturing companies moving towards higher operational and sustainable performances. The research work developed here shows that although a proper definition of L&G is neither exposed worldwide nor explicitly implemented under that name, the current industrial firms are deeply concerned about the demanding challenge of keeping businesses flexible and agile without forgetting strategies to minimize the acceleration of climate change. So, one contribution of this paper is the identification and characterization of L&G drivers and design principles, supporting a robust and well-informed L&G systems implementation. As inferred from the research work, this challenge demands high quality and updated data together with assertive information. Thus, the implementation of L&G in I4.0 contexts is the answer to overcome the identified barriers. Likewise, an L&G system contributes to overcoming the challenges of I4.0 implementation regarding the triple bottom line sustainability concept. Consequently, another contribution of this paper is to depict why an L&G system performs better in the I4.0 context.

scholarly journals Reconstructing the Contours of the Copyright Originality and Idea- Expression Doctrines Regarding the Right to Deny Access to Works

2014 ◽  
Vol 1 (4) ◽  
pp. 921-940
Author(s):  
Michael D. Murray
Keyword(s):  
First Amendment ◽  
Freedom Of Expression ◽  
Cultural Knowledge ◽  
Fair Use ◽  
Digital Revolution ◽  
Content Development ◽  
Proper Definition ◽  
Definition Of ◽  
Access To Knowledge ◽  
The Right

ccess to innovative scientific, literary, and artistic content has never been more important to the public than now, in the digital age. Thanks to the digital revolution carried out through such means as super-computational power at super-affordable prices, the Internet, broadband penetration, and contemporary computer science and technology, the global, national, and local public finds itself at the convergence of unprecedented scientific and cultural knowledge and content development, along with unprecedented means to distribute, communicate, and access that knowledge. This Article joins the conversation on the Access-to-Knowledge, Access-to- Medicine, and Access-to-Art movements by asserting that the copyright restrictions affecting knowledge, innovation, and original thought implicate copyright’s originality and idea-expression doctrines first and fair use doctrine second. The parallel conversation in copyright law that focuses on the proper definition of the contours of copyright as described in the U.S. Supreme Court’s most recent constitutional law cases on copyright—Feist, Eldred, Golan, and Kirtsaeng—interprets the originality and idea-expression doctrines as being necessary for the proper balance between copyright protection and First Amendment freedom of expression. This Article seeks to join together the two conversations by focusing attention on the right to access published works under both copyright and First Amendment law. Access to works is part and parcel of the copyright contours debate. It is a “first principles” question to be answered before the question of manipulation, appropriation, or fair use is contemplated. The original intent of the Copyright Clause and its need to accommodate the First Amendment freedom of expression support the construction of the contours of copyright to include a right to access knowledge and information. Therefore, the originality and idea-expression doctrines should be reconstructed to recognize that the right to deny access to published works is extremely limited if not non-existent within the properly constructed contours of copyright.

scholarly journals Ki vagyok én? - Szárnyas fejvadász 2049

2020 ◽  
Vol 10 (21) ◽  
pp. 307-312
Author(s):  
Pál Gerdesits
Keyword(s):  
Michel Foucault ◽  
Jacques Derrida ◽  
Self Identity ◽  
Ferdinand De Saussure ◽  
Blade Runner ◽  
Jean Paul ◽  
Proper Definition ◽  
Definition Of ◽  
Philosophical Questions

My essay focuses on the ontological crisis articulated in the film Blade Runner 2049, the sequel for Ridley Scott’s Blade Runner. This film is based on the conflict between humans and androids called replicants who would like to live equally to humans. In my opinion the root of their opposition lies on the inability to give a proper definition of what we normally call ‘human’. In this writing I present and analyse the nature of this conflict and also the philosophical questions (representation, freedom, self-identity etc.) arising from it based on the ideas of philosophers like Michel Foucault. Jean-Paul Sartre, Jacques Derrida and Ferdinand de Saussure.

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