70,756 research outputs found
Baby gang e violenza su minori alla prova del diritto penale: una risposta di sistema
No full textLa relazione ha avuto ad oggetto i rapporti tra diritto penale e violenze commesse da e su minorenn
Rigorous Bounds on the Free Energy of Electron-Phonon Models
No full textWe present a collection of rigorous upper and lower bounds to the free energy of electron-phonon models with linear electron-phonon interaction. These bounds are used to compare different variational approaches. It is shown rigorously that the ground states corresponding to the sharpest bounds do not exhibit Off-Diagonal Long-Range Order in the two-particle density matrix.
gang-board n
No full textgang-boardThe cargo space or hold [of the shallops], located in the waist between the cuddies, was not decked but covered with removable planks known as gang-boards.[Add to DNE gang-board n, to 1975 quot]G. M. Story AUG. 10 1988 WKPRINTED ITEM DNE SupUsed I and SupUsed I and Sup1Used Su
WANG Gang, interview d'un peintre chinois <br>: in Collection Langarts.
No full textFonds audiovisuel Langarts. La première mise en ligne est issue d'une collaboration avec le programme ESCoM-AAR (Equipe Sémiotique Cognitive et nouveaux Médias - Archives Audiovisuelles de la Recherche, 2001-2016). (Cf. ANR infra)WANG Gang, peintre chinois, est interviewé lors de l'exposition "Libre comme l'air" à la galerie Sinitude, 25 rue de Poitou, 75003 Paris. L'interview date de février 2010
Evaluation of Mass Privatization in Bulgaria
No full textThe mass privatization program in Bulgaria was implemented in 1996-97. Following programs in countries like the Czech Republic, more sophisticated regulatory bodies were put into place to prevent the kind of abuses observed elsewhere. This study finds that Bulgaria avoided some of the extreme problems that manifested themselves in these other countries, but there were still serious problems of dilution. Dilution is similar in both mass privatization firms and nonmass privatization firms. Dilution is associated with positive performance, suggesting that more concentrated ownership has had some benefits. Even after a number of years have passed, mass privatization firms have performed less well than firms privatized by other means.Bulgaria, mass privatization, dilution
Earnings Inequality in India: Has the Rise of Caste and Religion Based Politics in India had an Impact?
No full textSince 1989, there has been a sharp increase in the role of caste and religion in determining political fortunes at both state and federal levels in India. As a consequence, significant intercaste and inter-religion differences in earnings have the potential to stall the process of economic reforms. Yet, the patterns and determinants of such differences remain unexplored. We address this lacuna in the literature, and explore the determinants of the differences in inter-caste and inter-religion earnings in India during the 1987-99 period, using the 43rd and 55th rounds of National Sample Survey (NSS). Our results suggest that (a) earnings differences between “upper” castes and SC/ST have declined between 1987 and 1999, (b) over the same period, earnings differences between Muslims and non-Muslims have increased, to the detriment of the former, and (c) inter-caste and inter-religion differences in earnings can be explained largely by corresponding differences in educational endowment and returns on age (and, hence, experience). However, differences in returns on education do not explain inter-caste and interreligion earnings differences to a great extent.Inequality, Caste, Religion, India
Projective construction of two-dimensional symmetry-protected topological phases with U(1), SO(3), or SU(2) symmetries
No full textWe propose a general approach to construct symmetry protected topological (SPT) states (i.e., the short-range entangled states with symmetry) in 2D spin/boson systems on lattice. In our approach, we fractionalize spins/bosons into different fermions, which occupy nontrivial Chern bands. After the Gutzwiller projection of the free fermion state obtained by filling the Chern bands, we can obtain SPT states on lattice. In particular, we constructed a U(1) SPT state of a spin-1 model, a SO(3) SPT state of a boson system with spin-1 bosons and spinless bosons, and a SU(2) SPT state of a spin-1/2 boson system. By applying the “spin gauge field” which directly couples to the spin density and spin current of Sz components, we also calculate the quantum spin Hall conductance in each SPT state. The projective ground states can be further studied numerically in the future by variational Monte Carlo etc.National Science Foundation (U.S.) (Grant DMR-1005541
Le Gang Giovanili in Italia
No full textQuesto studio nasce dalla collaborazione fra il centro di ricerca interuniversitario sulla criminalità transnazionale Transcrime dell’Università
Cattolica del Sacro Cuore, Alma Mater Studiorum Università di Bologna e Università degli Studi di Perugia, il Servizio Analisi Criminale del Dipartimento della Pubblica Sicurezza del Ministero dell’Interno e il Dipartimento per la
Giustizia Minorile e di Comunità del Ministero della Giustizia, con particolare riferimento agli Uffici di Servizio Sociale per i Minorenni. Il rapporto inizia con la definizione di gang giovanile utilizzata in questa ricerca e le modalità con le quali è stata condotta la raccolta delle informazioni. In seguito, fornisce una panoramica dei risultati ottenuti e una descrizione dei vari tipi di gang giovanili individuati con dei brevi approfondimenti su alcuni casi rilevanti. Sono infine riassunte delle riflessioni sui potenziali fattori alla base di questo fenomeno e alcune proposte di intervento per la sua prevenzione e contrasto
Low-energy properties of anisotropic two-dimensional spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>Heisenberg models in staggered magnetic fields
No full textWe present a systematic study of the anisotropic spin-1/2 Heisenberg model in staggered magnetic fields in two dimensions. To mimic real materials, we consider a system of coupled, antiferromagnetic chains, whose interchain interaction can be either ferro-or antiferromagnetic. When the staggered field is commensurate with the magnetic interactions, an energy gap opens immediately and follows a power law as a function of the applied field, similar to the situation in one dimension. When the field competes with the interactions, a quantum phase transition (QPT) occurs from a gapless, magnetically ordered phase at low fields to a gapped, disordered regime. We use a continuous-time Monte Carlo method to compute the staggered moment of the ordered phases and the spin gap of the disordered phases. We deduce the phase diagrams as functions of the anisotropy ratio and the applied field, and calculate the scaling behavior of the models in both quantities. We show that in the competitive case, the staggered field acts to maintain a regime of quasi-1D behavior around the QPT, and we discuss as a consequence the nature of the crossover from one-dimensional (1D) to 2D physics
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