An alternative to the Allen-Cahn phase field model for interfaces in solids - numerical efficiency

The derivation of the Allen-Cahn and Cahn-Hilliard equations is based on the Clausius-Duhem inequality. This is not a derivation in the strict sense of the word, since other phase field equations can be fomulated satisfying this inequality. Motivated by the form of sharp interface problems, we formulate such an alternative equation and compare the properties of the models for the evolution of phase interfaces in solids, which consist of the elasticity equations and the Allen-Cahn equation or the alternative equation. We find that numerical simulations of phase interfaces with small interface energy based on the alternative model are more effective then simulations based on the Allen-Cahn model.Comment: arXiv admin note: text overlap with arXiv:1505.0544

Destruction of quantum coherence and wave packet dynamic

The main aim of this article is to discuss characteristic physical phenomena which govern the destruction of quantum coherence of material wave packets.Comment: to be published in `The Physics and Chemistry of Wave Packets', edited by J. A. Yeazell and T. Uzer (Wiley, N. Y.

A systematic study of two particle correlations from NA49 at CERN SPS

A systematic study of two particle correlations measured by the NA49 experiment is summarized. Radii from Bose Einstein interferometry have been determined separately in different parts of phase space, for different collision systems and at different incident beam energies. Moreover, first results of a new method of accessing space-time asymmetries in the emission of particles by means of non identical particle correlations are presented.Comment: 4 pages 3 figures publ. in proc. of QM99, Torino It Nuclear Physics

Where Turkey stands in Europe and why it should be admitted to the EU

Turkeys position relative to Europe is analyzed from three different perspectives, i.e (i) the semi-official perspective of the Copenhagen criteria, the Maastricht criteria and the Lisbon strategy, (ii) the perspective of comparative surveys, and (iii) the perspective of key European worries regarding future strains on cohesion funds and the complex relationship of the Turkish population to European values. It is shown that Turkeys standing in international comparisons of good governance has been improving in recent years and that the country is on a path of convergence with the Maastricht criteria. Turkey falls considerably short, however, of the employment and education goals of the Lisbon agenda. Comparative surveys show the Turkish population to have not only a low standard of living, but also a very low level of satisfaction with life and with public services, to have comparatively little trust in other people and a low level of civic engagement, and to nourish traditional attitudes concerning religious beliefs, womens rights and gender roles. Since Turkeys admission to the EU would enlarge the EU population by 15 %, but economic output by less than 3 %, Turkeys accession would severely strain EU cohesion funds. Despite these reservations, Turkeys admission to the Union is here advocated for three reasons: (1) Risks of a fundamentalist backlash against Europe would considerably increase if the long-standing accession promise were not kept. (2) Given that the country is entering a very favourable demographic phase for about 2-3 decades, there is considerable economic opportunity with a vast growth potential. (3) Since the recent Eastern enlargements have already decided the debate between federalists and inter-governmentalists in favour of the latter, Europe has more to gain than to lose from Turkeys membership which would strengthen the countrys ties to the West, and provide a chance of proving to the world that the motto of the European Union united in diversity is a better model for the future of international relations than the scenario of a clash of civilizations. --

A new Coulomb correction method for Bose-Einstein correlations, based on the Pi+ Pi- correlation measurements

We present the measured correlation functions for pi+ pi-, pi- pi- and pi+ pi+ pairs in central S+Ag collisions at 200 GeV per nucleon. The Gamov function, which has been traditionally used to correct the correlation functions of charged pions for the Coulomb interaction, is found to be inconsistent with all measured correlation functions. Certain problems which have been dominating the systematic uncertainty of the correlation analysis are related to this inconsistency. It is demonstrated that a new Coulomb correction method, based exclusively on the measured correlation function for pi+ pi- pairs, may solve the problem

Analisis Kesalahan Penggunaan Frasa pada Tajuk Rencana Surat Kabar Kompas

Surat kabar, sebagai media informasi yang dibaca oleh berbagai kalangan, memiliki peran penting dalam perkembangan bahasa sebuah bangsa. Sementara itu, pada surat kabar daerah atau nasional yang beredar, masih ditemukan kesalahan dalam penggunaan frasa. Kesalahan pun terjadi pada koran nasional setingkat Kompas. Kesalahan tersebut terjadi karena kurangnya perhatian terhadap kaidah kebahasaan. Oleh karena itu, dalam penelitian ini dikaji tentang kesalahan penggunaan frasa pada tajuk rencana surat kabar Kompas. Pada penelitian ini digunakan metode analisis isi (content analysis) yang bersifat preskriptif. Teknik pengumpulan data yang digunakan adalah teknik dokumentasi dan hermeneutik. Data penelitian bersumber dari tajuk rencana surat kabar harian Kompas yang diambil secara acak. Data yang diteliti didokumentasi dengan cara dibaca, dicatat, selanjutnya disimpulkan, dan dikelompokkan berdasarkan kesalahan yang terdapat dalam bidang frasa. Berdasarkan analisis, kesalahan penggunaan frasa pada tajuk rencana surat kabar Kompas adalah penggunaan unsur yang berlebihan atau mubazir dan penggunaan preposisi yang tidak tepat

Constructing Pauli pulse schemes for decoupling and quantum simulation

Dynamical decoupling is a powerful technique to suppress errors in quantum systems originating from environmental couplings or from unwanted inter-particle interactions. However, it can also be used to selectively decouple specific couplings in a quantum system. We present a simple and easy-to-use general method to construct such selective decoupling schemes on qubit and qudit networks by means of (generalized) Pauli operations. As these constructed schemes can suppress Hamiltonian interactions on general qudit networks selectively, they are well suited for purposes of approximate quantum simulation. Some examples are presented, demonstrating the use of our method and the resulting decoupling schemes.Comment: 11 pages, 5 figure

The inequality of electoral participation in Europe and America and the politically integrative functions of the welfare state

Electoral turnout is shown to be higher and less socially skewed in member states of the enlarged European Union than in the United States. The differences in the levels of turnout can partly be related to differences in election procedures, but since the procedural rules provide similar incentives or disincentives to all social groups they cannot explain the much higher inequality of electoral participation in America. There is some evidence to sustain the notion that the higher inclusiveness of the West European welfare state fosters political integration and the equality of electoral participation. In line with this notion differences between Europe and America diminish considerably when the analysis is confined to the pensioner generation whose integration into welfare state schemes is largely similar on both sides of the Atlantic. --

Entanglement and the linearity of quantum mechanics

Optimal universal entanglement processes are discussed which entangle two quantum systems in an optimal way for all possible initial states. It is demonstrated that the linear character of quantum theory which enforces the peaceful coexistence of quantum mechanics and relativity imposes severe restrictions on the structure of the resulting optimally entangled states. Depending on the dimension of the one-particle Hilbert space such a universal process generates either a pure Bell state or mixed entangled states. In the limit of very large dimensions of the one-particle Hilbert space the von-Neumann entropy of the optimally entangled state differs from the one of the maximally mixed two-particle state by one bit only.Comment: Proceedings of the X International Symposium on Theoretical Electrical Engineering, ISTET 99, Magdebur