In Defense of Accountability as a Lens to Perceive Privatization’s Problems

Privatization ◽

10.18574/nyu/9781479842933.003.0003 ◽

2018 ◽

pp. 30-51

Author(s):

Laura A. Dickinson

Keyword(s):

Structural Transformation ◽

Executive Power ◽

And Diffusion

This chapter responds to Debra Satz’s paper. It argues that a more expansive conception of accountability, which addresses the structural transformation of governance, includes concerns about distortion and equality. Through examples of security and military privatization, Dickinson maintains that such privatization has enabled the expansion of executive power and the fragmentation and diffusion of governmental authority, threats to accountability with serious consequences for democracy.

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The influence of pressure on the structural transformation and diffusion mechanism in lithium-silicate melt: Molecular dynamics simulation

International Journal of Modern Physics B ◽

10.1142/s0217979220503129 ◽

2020 ◽

Vol 34 (32) ◽

pp. 2050312

Author(s):

Nguyen Thi Thanh Ha

Keyword(s):

Molecular Dynamics ◽

Structural Transformation ◽

Diffusion Mechanism ◽

Bond Distance ◽

Silicate Melt ◽

Dynamics Simulation ◽

Lithium Silicate ◽

Angle Distribution ◽

Bond Angle Distribution ◽

And Diffusion

The structural transformation and diffusion mechanism of lithium-silicate melt is carried by molecular dynamics method. In order to investigate the nature of the pressure-induced structural transformations, the pair radial distribution function (PRDF), distribution of SiO[Formula: see text], OSi[Formula: see text] and LiO[Formula: see text] coordination units, bond angle distribution (BAD) and bond distance distribution (BDD) are analyzed. The investigation reveals that there is a structural transformation in the structure of lithium-silicate. The addition of alkali oxides results in the formation of nonbridging oxygens (NBOs) by disruption of the Si–O network and it has a slight effect on the topology of SiO[Formula: see text] and OSi[Formula: see text] units. Furthermore, we show that the diffusion of network-former atom in lithium-silicate melt is anomaly and Li atoms have significantly faster diffusion rate than those of oxygen or silicon atoms. Therefore, there is an existence of two diffusion mechanisms in lithium-silicate.

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Meridional Circulation, Turbulence, and Diffusion Processes in Stars

International Astronomical Union Colloquium ◽

10.1017/s0252921100080477 ◽

1976 ◽

Vol 32 ◽

pp. 109-116 ◽

Cited By ~ 1

Author(s):

S. Vauclair

Keyword(s):

Convection Zone ◽

Diffusion Processes ◽

Meridional Circulation ◽

Diffusion Time ◽

Work In Progress ◽

First Results ◽

Stellar Envelopes ◽

And Diffusion ◽

Turbulence And Diffusion ◽

Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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The structure of pre-mRNA and mRNA from erythroid cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100082030 ◽

1978 ◽

Vol 36 (2) ◽

pp. 234-235

Author(s):

A.-M. Ladhoff ◽

B.J. Thiele ◽

Ch. Coutelle ◽

S. Rosenthal

Keyword(s):

Bone Marrow ◽

Structural Transformation ◽

Electron Micrographs ◽

Ammonium Acetate ◽

Bone Marrow Cells ◽

Erythroid Cells ◽

Globin Mrna ◽

Ordered Structures ◽

Rabbit Bone ◽

Rabbit Reticulocytes

The suggested precursor-product relationship between the nuclear pre-mRNA and the cytoplasmic mRNA has created increased interest also in the structure of these RNA species. Previously we have been published electron micrographs of individual pre-mRNA molecules from erythroid cells. An intersting observation was the appearance of a contour, probably corresponding to higher ordered structures, on one end of 10 % of the pre-mRNA molecules from erythroid rabbit bone marrow cells (Fig. 1A). A virtual similar contour was observed in molecules of 9S globin mRNA from rabbit reticulocytes (Fig. 1B). A structural transformation in a linear contour occurs if the RNA is heated for 10 min to 90°C in the presence of 80 % formamide. This structural transformation is reversible when the denatured RNA is precipitated and redissolved in 0.2 M ammonium acetate.

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Structural Transformation of a Germanium Σ=13 (510) [001] Tilt Grain Boundary under the Electron Beam

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100179014 ◽

1990 ◽

Vol 48 (1) ◽

pp. 52-53 ◽

Cited By ~ 1

Author(s):

Jean-Luc Rouvière ◽

Alain Bourret

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Grain Boundary ◽

Structural Transformation ◽

Mirror Symmetry ◽

High Resolution Electron Microscopy ◽

Structural Transformations ◽

Covalent Bonds ◽

Resolution Electron ◽

Tilt Grain Boundary

The possible structural transformations during the sample preparations and the sample observations are important issues in electron microscopy. Several publications of High Resolution Electron Microscopy (HREM) have reported that structural transformations and evaporation of the thin parts of a specimen could happen in the microscope. Diffusion and preferential etchings could also occur during the sample preparation.Here we report a structural transformation of a germanium Σ=13 (510) [001] tilt grain boundary that occurred in a medium-voltage electron microscopy (JEOL 400KV).Among the different (001) tilt grain boundaries whose atomic structures were entirely determined by High Resolution Electron Microscopy (Σ = 5(310), Σ = 13 (320), Σ = 13 (510), Σ = 65 (1130), Σ = 25 (710) and Σ = 41 (910), the Σ = 13 (510) interface is the most interesting. It exhibits two kinds of structures. One of them, the M-structure, has tetracoordinated covalent bonds and is periodic (fig. 1). The other, the U-structure, is also tetracoordinated but is not strictly periodic (fig. 2). It is composed of a periodically repeated constant part that separates variable cores where some atoms can have several stable positions. The M-structure has a mirror glide symmetry. At Scherzer defocus, its HREM images have characteristic groups of three big white dots that are distributed on alternatively facing right and left arcs (fig. 1). The (001) projection of the U-structure has an apparent mirror symmetry, the portions of good coincidence zones (“perfect crystal structure”) regularly separate the variable cores regions (fig. 2).

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