scholarly journals WHAT IS THE TEMPERATURE DEPENDENCE OF THE CASIMIR FORCE BETWEEN REAL METALS?

2002 ◽  
Vol 17 (06n07) ◽  
pp. 751-760 ◽  
Author(s):  
G. L. KLIMCHITSKAYA
Keyword(s):  
Temperature Dependence ◽  
Dielectric Function ◽  
Casimir Force ◽  
Recent Literature ◽  
Nonzero Temperature ◽  
Application Range ◽  
The Subject ◽  
Special Modification ◽  
Frequency Term ◽  
Zero Frequency

The situation with the temperature corrections to the Casimir force between real metals of finite conducitivity is reported. It is shown that the plasma dielectric function is well adapted to the Lifshitz formula and leads to reasonable results for real conductors. The Drude dielectric function which describes media with dissipation is found not to belong to the application range of the Lifshitz formula at nonzero temperature. For Drude metals the special modification of the zero-frequency term of this formula is suggested. The contradictory results on the subject in recent literature are analysed and explained.

scholarly journals THERMAL CASIMIR FORCE BETWEEN MAGNETIC MATERIALS

2010 ◽  
Vol 25 (11) ◽  
pp. 2293-2301 ◽  
Author(s):  
G. L. KLIMCHITSKAYA ◽  
B. GEYER ◽  
V. M. MOSTEPANENKO
Keyword(s):  
Magnetic Properties ◽  
Dielectric Properties ◽  
Magnetic Materials ◽  
Casimir Force ◽  
Parallel Plates ◽  
Nonzero Temperature ◽  
Metal Plates ◽  
Vacuum Gap ◽  
Frequency Term ◽  
Zero Frequency

We investigate the Casimir pressure between two parallel plates made of magnetic materials at nonzero temperature. It is shown that for real magnetodielectric materials only the magnetic properties of ferromagnets can influence the Casimir pressure. This influence is accomplished through the contribution of the zero-frequency term of the Lifshitz formula. The possibility of the Casimir repulsion through the vacuum gap is analyzed depending on the model used for the description of the dielectric properties of the metal plates.

Materials for Electron Beam Information Storage

1969 ◽  
Vol 27 ◽  
pp. 152-153 ◽  
Author(s):  
D. E. Speliotis
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Recent Literature ◽  
Electron Beams ◽  
Information Storage ◽  
The Subject ◽  
The Magnetic Field

The interaction of electron beams with a large variety of materials for information storage has been the subject of numerous proposals and studies in the recent literature. The materials range from photographic to thermoplastic and magnetic, and the interactions with the electron beam for writing and reading the information utilize the energy, or the current, or even the magnetic field associated with the electron beam.

The Development of Diarthrodial Joints in Birds and Mammals

1890 ◽  
Vol 16 ◽  
pp. 258-261 ◽  
Author(s):  
David Hepburn
Keyword(s):  
Recent Literature ◽  
Human Foetus ◽  
Diarthrodial Joints ◽  
Mammalian Embryos ◽  
The Subject ◽  
The Common ◽  
Full Period

After giving a summary of recent literature on the subject, the author then proceeded to state the nature of the material which he had employed in the present investigation.The bird selected was the common fowl (Gallus domest.), and he had examined a series of microscopic sections through the limbs from the fourth day of incubation to the day of hatching.The mammalian embryos examined were mice and rabbits, and the fingers of the human fœtus from an embryo approaching the full period of uterogestation.

scholarly journals Temperature dependence of the dielectric function and critical points of α-SnS from 27 to 350 K

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hoang Tung Nguyen ◽  
Van Long Le ◽  
Thi Minh Hai Nguyen ◽  
Tae Jung Kim ◽  
Xuan Au Nguyen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Dielectric Function ◽  
Spectral Energy ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Temperature Dependences ◽  
Exciton Effect ◽  
Bose Einstein ◽  
Temperature Gradient Method

Abstract We report the temperature dependence of the dielectric function ε = ε1 + iε2 and critical point (CP) energies of biaxial α-SnS in the spectral energy region from 0.74 to 6.42 eV and temperatures from 27 to 350 K using spectroscopic ellipsometry. Bulk SnS was grown by temperature gradient method. Dielectric response functions were obtained using multilayer calculations to remove artifacts due to surface roughness. We observe sharpening and blue-shifting of CPs with decreasing temperature. A strong exciton effect is detected only in the armchair direction at low temperature. New CPs are observed at low temperature that cannot be detected at room temperature. The temperature dependences of the CP energies were determined by fitting the data to the phenomenological expression that contains the Bose–Einstein statistical factor and the temperature coefficient for describing the electron–phonon interaction.

L'origine del linguaggio puň attendere

PARADIGMI ◽  
2009 ◽  
pp. 163-172
Author(s):  
Francesco Ferretti
Keyword(s):  
Recent Literature ◽  
Empirical Treatment ◽  
Viable Alternative ◽  
Linguistic Variation ◽  
Cognitive Perspective ◽  
Evolutionary Theories ◽  
Language Origin ◽  
Origin Of Language ◽  
Naturalistic Approach ◽  
The Subject

- Starting from a discussion of Sylvain Auroux's new book (L'origine des langues... 2007), the paper develops a critique of the anti-naturalistic approach to the study of language. The rejection of the quest for language origin as a theory unsusceptible to scientific empirical treatment is an aspect of the idealistic consequences of anti-naturalist positions. A survey is presented of recent literature on the subject. In our opinion, evolutionary theories, revisited from a cognitive perspective, have radically changed the terms of the debate and made naturalism a viable alternative. Keywords: Evolutionism, FOXP2, Innateness, Linguistic variation, Nature-nurture debate, Origin of language.

Who Were the Poor? The Recipients of Relief

2018 ◽  
pp. 167-186
Author(s):  
John McCallum
Keyword(s):  
Early Modern ◽  
Recent Literature ◽  
Internal Dynamics ◽  
The Poor ◽  
Fixed Model ◽  
Local Patterns ◽  
The Subject ◽  
Relief System ◽  
Source Of Information

This chapter analyses the poor themselves. Although recent literature has made valuable attempts to study the poor in their own right rather than simply through the prism of relief (and therefore elites), welfare records remain the richest source of information on the poor, especially in an area such as Scotland where very little previous work has been undertaken. Therefore the chapter opens up the subject of who received relief and why, shedding light not just on the internal dynamics of this most neglected group within Scottish society, but also on the agenda and priorities of the relief system itself. The chapter draws attention to variations in the demographics of relief recipients, and argues that there was no fixed model or ‘type’ of recipient, and that kirk sessions were responding to local patterns of need. The chapter also emphasises the complexity and range of (overlapping) reasons why early modern Scots might find themselves in need of welfare.

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