Search results for "Hub"

Challenges in truncating the hierarchy of time-dependent reduced density matrices equations

2012

In this work, we analyze the Born, Bogoliubov, Green, Kirkwood, and Yvon (BBGKY) hierarchy of equations for describing the full time evolution of a many-body fermionic system in terms of its reduced density matrices (at all orders). We provide an exhaustive study of the challenges and open problems linked to the truncation of such a hierarchy of equations to make them practically applicable. We restrict our analysis to the coupled evolution of the one- and two-body reduced density matrices, where higher-order correlation effects are embodied into the approximation used to close the equations. We prove that within this approach, the number of electrons and total energy are conserved, regardl…

Hubris manageriale e diversificazione d’impresa

2021

La presente ricerca propone un framework interpretativo del ruolo del Chief Executive Officer (CEO) hubristico nei processi di diversificazione.

Motives for partial acquisitions between firms in the spanish stock market

2003

The paper analyses the motivations for inter-company investment on the Spanish Stock Market through the study of a sample of significant acquisitions reported to the CNMV (the Spanish Securities and Exchange Commission) by quoted firms. By analysing the sign of the cumulative abnormal returns (CAR) and of the correlations among the gains produced by the operation, an attempt is made to find out which motives predominate of the three most important ones suggested by the literature for takeovers: synergy, agency and hubris. Empirical evidence is presented that in the Spanish Stock Market the main motive for acquiring a holding is similar to synergy, especially in partial acquisitions with pos…

Hubris, constitutionalism, and “the indissoluble unity of the Spanish nation”: A reply to Hèctor López Bofill

2019

The bright and dark sides of CEO hubris: Assessing cultural distance in international business

2021

This paper aims to enrich the behavioral theory of international business strategyby investigating how CEO hubris (i.e., excess pride and confidence) affects inter-national strategic choices, that is, location selection, entry timing, and modes ofentry into the target market. Specifically, we focus on the relationship betweencultural distance and international strategic choices and consider hubris as a mech-anism that influences CEOs’ decisions. Our conceptual framework recognizes thatthe performance of international strategies managed by hubristic CEOs isextremely volatile. On the one hand, we corroborate the idea that hubris has adark side that may lead to pernicious outcomes. On the othe…

Magnetoresistance studies of the ferromagnetic molecular metal (BEDT-TTF)3[MnCr(C2O4)3] under pressure

2003

(BEDT-TTF)3[MnCr(C2O4)3] is the first ferromagnetic molecular metal, in which organic layers of BEDT-TTF alternate with infinite layers of the bimetallic oxalate complex [MnCr(C2O4)3]-. While the bimetallic layer undergoes a magnetic phase transition into a canted ferromagnetic state at 5.5 K, the metallic character of the conductivity is not affected by the magnetic transition [Nature 408 (2000) 447]. We performed magnetoresistance measurements (B≤17 T) at low temperatures (T≥900 mK) and under hydrostatic pressures of up to 2.0 GPa. Oscillations in the magnetoresistance develop under pressure that can be interpreted as Shubnikov-de Haas oscillations, if an internal magnetic field is taken …

Fear of Missing Out as a Predictor of Problematic Social Media Use and Phubbing Behavior among Flemish Adolescents

2018

Fear-of-missing-out (FOMO) refers to feelings of anxiety that arise from the realization that you may be missing out on rewarding experiences that others are having. FOMO can be identified as an intra-personal trait that drives people to stay up to date of what other people are doing, among others on social media platforms. Drawing from the findings of a large-scale survey study among 2663 Flemish teenagers, this study explores the relationships between FOMO, social media use, problematic social media use (PSMU) and phubbing behavior. In line with our expectations, FOMO was a positive predictor of both how frequently teenagers use several social media platforms and of how many platforms the…

Long-term habituation to spatial novelty in blind cave fish (Astyanax hubbsi): role of the telencephalon and its subregions.

2000

Blind cave fish, when released into a novel environment, show a typical exploratory behavior characterized by high swim speed along walls shortly after release. This behavior wanes during prolonged exposure and thus may reflect habituation to novelty. As the hippocampus of mammals, which plays a crucial role in spatial learning, is part of the telencephalon, the possible involvement of this brain structure of fish was investigated in exploratory behavior. Ablation of the whole telencephalon or bilateral removal of dorsal parts of the hemispheres reduced activity; in contrast, unilateral lesions of one hemisphere, bilateral lesions of dorsal and dorsoventral parts, and removal of olfactory b…

The origin of failure: A multidisciplinary appraisal of the hubris hypothesis and proposed research agenda

2014

The hubris hypothesis complements the extant debate on how people make judgments and decisions in organizations. Drawing on the origin of hubris in Greek mythology, the psychological approach, and finance studies, this paper portrays an informed picture of the current status of managerial hubris literature that develops a more advanced understanding of what is known about hubris. We present a conceptual map that provides a comprehensive appreciation of hubris antecedents-symptoms-strategic choices-feedback performance main cause effect relationships. Our proposed conceptual map draws on the idea that managerial hubris is one of the determinants of CEO judgments, strategic choices, and organ…

First principles calculations on CeO2 doped with Tb3+ ions

2019

This research was funded by the Latvian Council of Science (under the grant project lzp-2018/1-0147). Authors thank W. Chueh, J. Serra, R. Merkle, A. Popov for fruitful discussions.