Triangular Geopolitics in Europe’s Eastern Neighbourhood. CEPS Commentary, 2 December 2014

Over the last few months, Russia has employed a number of economic and security measures to derail the Deep and Comprehensive Free Trade Agreement (DCFTA) between the EU and Ukraine. Russia’s opposition to the Agreement was based on the argument that it would damage its economy and weaken its trade ties with Ukraine. Russia’s actions ultimately led to war in Ukraine, but did not succeed in reversing Ukraine’s EU integration policies; instead there are now trilateral negotiations between the EU, Ukraine and Russia on mere technical trade aspects of the DCFTA. The Kremlin is using similar rhetoric and, to some extent, similar coercive measures against the DCFTAs with Moldova and Georgia. But the small scale of Moldovan and Georgian trade with Russia is not a legitimate reason for the EU to replicate the Ukraine ‘trialogue’ on the DCFTAs in these countries. Instead, Moldova’s heavy dependence on Russia’s energy and the former’s transit role for the EU offers a greater possibility to set up trilateral negotiations, similar to the recently finalised gas trialogue between the EU, Ukraine and Russia.

Solving triangular systems on a parallel computer /

Includes bibliographical references.

Disk I/O for non-core-contained P.D.E. meshes and arrays /

"March 5, 1969."

The triangular society. Leaves from the life of a Portland family.

Mode of access: Internet.

Linearized theory of conical supersonic flow with application to triangular wings /

Loose-leaf.

The history of Crowland Abbey, digested from the materials collected by Mr. Gough, and published ... 1783 and 1797; including an abstract of the observations of Mr. Essex, respecting the ancient and present state of the abbey, and the origin and use of the triangular bridge ...

"Appendix: Concerning the history of the building of our more ancient abbey churches, and the rise and progress of the pointed or English architecture; digested from the essays published by J. Taylor, on the architecture of the middle ages, by ... T. Warton, J. Bentham, and J. Milner, and Captain Grose ..." (p. [143]-182) has special half-title.

Proceedings of the M [three dots in triangular formation̈ W [three dots in triangular formation̈ Grand lodge of Free and accepted masons of the state of California at its annual communication

Mode of access: Internet.

Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet

We use series expansion methods to calculate the dispersion relation of the one-magnon excitations for the spin-(1)/(2) triangular-lattice nearest-neighbor Heisenberg antiferromagnet above a three-sublattice ordered ground state. Several striking features are observed compared to the classical (large-S) spin-wave spectra. Whereas, at low energies the dispersion is only weakly renormalized by quantum fluctuations, significant anomalies are observed at high energies. In particular, we find rotonlike minima at special wave vectors and strong downward renormalization in large parts of the Brillouin zone, leading to very flat or dispersionless modes. We present detailed comparison of our calculated excitation energies in the Brillouin zone with the spin-wave dispersion to order 1/S calculated recently by Starykh, Chubukov, and Abanov [Phys. Rev. B74, 180403(R) (2006)]. We find many common features but also some quantitative and qualitative differences. We show that at temperatures as low as 0.1J the thermally excited rotons make a significant contribution to the entropy. Consequently, unlike for the square lattice model, a nonlinear sigma model description of the finite-temperature properties is only applicable at temperatures < 0.1J. Finally, we review recent NMR measurements on the organic compound kappa-(BEDT-TTF)(2)Cu-2(CN)(3). We argue that these are inconsistent with long-range order and a description of the low-energy excitations in terms of interacting magnons, and that therefore a Heisenberg model with only nearest-neighbor exchange does not offer an adequate description of this material.

Growth mechanism of truncated triangular GaAs nanowires

During the growth of GaAs nanowires on the {111}B GaAs substrate, truncated triangular GaAs nanowires were commonly observed in the bottom region of nanowires. Through detailed structural analysis by electron microscopy, we have determined the growth mechanism of truncated triangular GaAs nanowires.

Optical frequency conversion, pulse compression and signal copying using triangular pulses

We propose techniques of optical frequency conversion, pulse compression and signal copying based on a combination of cross-phase modulation using triangular pump pulses and subsequent propagation in a dispersive medium.

Experimental optimization of triangular pulse generation in normal dispersion fiber for all optical processing applications

We experimentally investigate a multi-parameter optimization of conditions for generation of triangular pulses in normal dispersion fiber. We find that triangular pulses suitable for all optical processing applications can be generated for a wide range of input pulse chirps but that triangular pulse quality and stability is improved with increased input pulse chirp.