Variability of the coefficient of consolidation of the Mexico city clayey sediments on spatial and time scales

1996 ◽  
Vol 54 (1) ◽  
pp. 125-135 ◽  
Author(s):  
A. G. Ortega
Keyword(s):  
Mexico City ◽  
Time Scales ◽  
Coefficient Of Consolidation

LVSEM: Past Present and Future

1990 ◽  
Vol 48 (1) ◽  
pp. 364-365
Author(s):  
James B. Pawley
Keyword(s):  
Field Emission ◽  
Line Width ◽  
Time Scales ◽  
Silicon Oxide ◽  
Beam Current ◽  
High Brightness ◽  
High Beam ◽  
Fixed Charges ◽  
Beam Voltage ◽  
Deposited Metal

Past: In 1960 Thornley published the first description of SEM studies carried out at low beam voltage (LVSEM, 1-5 kV). The aim was to reduce charging on insulators but increased contrast and difficulties with low beam current and frozen biological specimens were also noted. These disadvantages prevented widespread use of LVSEM except by a few enthusiasts such as Boyde. An exception was its use in connection with studies in which biological specimens were dissected in the SEM as this process destroyed the conducting films and produced charging unless LVSEM was used.In the 1980’s field emission (FE) SEM’s came into more common use. The high brightness and smaller energy spread characteristic of the FE-SEM’s greatly reduced the practical resolution penalty associated with LVSEM and the number of investigators taking advantage of the technique rapidly expanded; led by those studying semiconductors. In semiconductor research, the SEM is used to measure the line-width of the deposited metal conductors and of the features of the photo-resist used to form them. In addition, the SEM is used to measure the surface potentials of operating circuits with sub-micrometer resolution and on pico-second time scales. Because high beam voltages destroy semiconductors by injecting fixed charges into silicon oxide insulators, these studies must be performed using LVSEM where the beam does not penetrate so far.

SPECTRAL DIFFUSION AND RELAXATION OF PHOTOCHEMICAL HOLES ON LOGARITHMIC TIME SCALES

1985 ◽  
Vol 46 (C7) ◽  
pp. C7-357-C7-361 ◽  
Author(s):  
J. Friedrich ◽  
D. Haarer
Keyword(s):  
Time Scales ◽  
Spectral Diffusion

Migrant Diplomacies: Rethinking Diplomacy Beyond State-Centric Perspectives. A Civic Bi-Nationality Experience from North America

2020 ◽  
Vol 17 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Antonio Alejo
Keyword(s):  
North America ◽  
Mexico City ◽  
Theoretical Framework ◽  
Global Politics ◽  
National Interests ◽  
Interdisciplinary Dialogue ◽  
Contemporary Politics ◽  
Migrant Activism ◽  
Point Of Departure

There is a pressing need to extend our thinking about diplomacy beyond state-centric perspectives, as in the name of sovereignty and national interests, people on move are confronting virtual, symbolic and/or material walls and frames of policies inhibiting their free movement. My point of departure is to explore migrant activism and global politics through the transformation of diplomacy in a globalised world. Developing an interdisciplinary dialogue between new diplomacy and sociology, I evidence the emergence of global sociopolitical formations created through civic bi-nationality organisations. Focusing on the agent in interaction with structures, I present a theoretical framework and strategy for analysing the practices of migrant diplomacies as an expression of contemporary politics. A case study from North America regarding returned families in Mexico City provides evidence of how these alternative diplomacies are operating.

Curb Cuts: Crip Displacements and El Edificio de Enfrente

Somatechnics ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 198-215
Author(s):  
Robert McRuer
Keyword(s):  
Mexico City ◽  
Global Capitalism ◽  
Poor People ◽  
Spatial Politics ◽  
Cultural System ◽  
Good Will ◽  
British Embassy ◽  
The Uk

Theorists of neoliberalism have placed dispossession and displacement at the centre of their analyses of the workings of contemporary global capitalism. Disability, however, has not figured centrally into these analyses. This essay attends to what might be comprehended as the crip echoes generated by dispossession, displacement, and a global austerity politics. Centring on British-Mexican relations during a moment of austerity in the UK and gentrification in Mexico City, the essay identifies both the voices of disability that are recognized by and made useful for neoliberalism as well as those shut down or displaced by this dominant economic and cultural system. The spatial politics of austerity in the UK have generated a range of punishing, anti-disabled policies such as the so-called ‘Bedroom Tax.’ The essay critiques such policies (and spatial politics) by particularly focusing on two events from 2013: a British embassy good will event exporting British access to Mexico City and an installation of photographs by Livia Radwanski. Radwanski's photos of the redevelopment of a Mexico City neighbourhood (and the displacement of poor people living in the neighbourhood) are examined in order to attend to the ways in which disability might productively haunt an age of austerity, dispossession, and displacement.

Musical Ritual in Mexico City: From Aztec to NAFTA

2005 ◽  
Vol 10 (2) ◽  
pp. 475-477
Author(s):  
Mark Pedelty
Keyword(s):  
Mexico City
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