44,471 Works

Evaluation of digital soil mapping approaches with large sets of environmental covariates

Andri Baltensweiler, Madlene Nussbaum, Urs Grob, Andreas Jürg Papritz, Armin Keller, Kay Spiess, Lucie Greiner & Michael E. Schaepman
ISSN:2199-3971

The formation of excess air in groundwater studied using noble gases as conservative tracers in laboratory and field experiments

Stephan R. Klump
The concentrations of atmospheric noble gases dissolved in groundwater mostly exceed their respective atmospheric equilibrium concentrations. In groundwater hydrology, this well-known phenomenon is usually referred to as the "excessair" phenomenon. The presence of excess air crucially affects the quantitative interpretation of environmental tracer concentrations in terms of paleo-environmental conditions and groundwater residence time, because a reliable determination of the atmospheric equilibrium component is required in such cases. In addition, excess air itself is potentially a...

US-Caucasus Relations: Attitudes towards the West

Fariz Ismailzade, Julia Hon, Therese Svensson, Mikayel Zolyan & George Khelashvili
Caucasus Analytical Digest (CAD), 13

Public Opinion in Georgia: New Caucasus Barometer Results

Natia Mestvirishvili, Maia Mestvirishvili, David Sichinava & Tinatin Zurabishvili
Caucasus Analytical Digest (CAD), 102

The South Caucasus Between the EU and the Eurasian Union

Temuri Yakobashvili, Vugar Bayramov, Anar Valiyev, Iris Kempe, Richard Giragosian & Fyodor Lukyanov
ISSN:1867-9323

Online Media in the South Caucasus

Lia Tsuladze, Tariyel Jalalli, Tatevik Sargsyan, Mariam Gabedava, Ulviyya Asadzade & Koba Turmanidze
ISSN:1867-9323

From crossing-free graphs on wheel sets to embracing simplices and polytopes with few vertices

Emo Welzl, Alexander Pilz & Manuel Wettstein
A set P = H cup {w} of n+1 points in the plane is called a wheel set if all points but w are extreme. We show that for the purpose of counting crossing-free geometric graphs on P, it suffices to know the so-called frequency vector of P. While there are roughly 2^n distinct order types that correspond to wheel sets, the number of frequency vectors is only about 2^{n/2}. We give simple formulas in...

Linear and nonlinear elastic properties of dense granular packings: A DEM exploration

Xiaoping Jia, Robert Guyer, Paul Johnson, Jan Carmeliet & Laure Lemrich
Discrete Element Method modeling is used to study the frequency spectrum of particle motion in dense 3D packings of glass beads with Hertz-Mindlin contacts. Frequency sweeps show a dependency of the resonant frequencies on the drive amplitude and confining stress on the system, showing material changes in the system. The amplitude dependency of the second thickness mode 3λ/4 as identified by the internal strain field scales as f ∝ σ1/6 while the confining stress dependency...

Foreign Policy Changes in Georgia

David Sichinava, Michael Cecire & Kakha Gogolashvili
ISSN:1867-9323

Improved distributed degree splitting and edge coloring

Fabian Kuhn, Juho Hirvonen, Mohsen Ghaffari, Jara Uitto, Jukka Suomela & Yannic Maus
The degree splitting problem requires coloring the edges of a graph red or blue such that each node has almost the same number of edges in each color, up to a small additive discrepancy. The directed variant of the problem requires orienting the edges such that each node has almost the same number of incoming and outgoing edges, again up to a small additive discrepancy. We present deterministic distributed algorithms for both variants, which improve...

Nr.99: Georgia's relations with the EU

Shu Uchida, Tinatin Zurabishvili & Shota Kakabadze
ISSN:1867-9323

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