20,958 research outputs found
Networks of People in Specialty Production: Family Firms in the Iron and Steel Wire Industries in Spain (1870-2000)
Capital intensive industries in specialized niches of production have constituted solid ground for family firms in Spain, as evidenced by the experience of the iron and steel wire industries between 1870 and 2000. The embeddedness of these firms in their local and regional environments have allowed the creation of networks that, together with favourable institutional conditions, significantly explain the dominance of family entrepreneurship in iron and steel wire manufacturing in Spain, until the end of the 20th century. Dominance of family firms at the regional level has not been an obstacle for innovation in wire manufacturing in Spain, which has taken place even when institutional conditions blocked innovation and traditional networking. Therefore, economic theories about the difficulties dynastic family firms may have to perform appropriately in science-based industries must be questioned.family firms, spanish economic history, steel wire industries
Gender and family firms: an interdisciplinary approach
This study contributes to developing our understanding of gender and family business, a topic so crucial to recent policies about competitive growth. It does so by providing an interdisciplinary synthesis of some major theoretical debates. It also contributes to this understanding by illuminating the role of women and their participation in the practices of the family and the business. Finally, it explores gender relations and the notion that leadership in family business may take complex forms crafted within constantly changing relationships. Leadership is introduced as a concept that captures the reality of women and men in family firms in a better way than other concepts used by historians or economists like ownership and management.genere, gender, empresa familiar, family firms, leadership, lideratge
Combining absolute and relative information in studies on food quality
A common problem in food science concerns the assessment of the quality of food samples. Typically, a group of panellists is trained exhaustively on how to identify different quality indicators in order to provide absolute information, in the form of scores, for each given food sample. Unfortunately, this training is expensive and time-consuming. For this very reason, it is quite common to search for additional information provided by untrained panellists. However, untrained panellists usually provide relative information, in the form of rankings, for the food samples. In this paper, we discuss how both scores and rankings can be combined in order to improve the quality of the assessment
Measurements incompatible in Quantum Theory cannot be measured jointly in any other local theory
It is well known that jointly measurable observables cannot lead to a
violation of any Bell inequality - independent of the state and the
measurements chosen at the other site. In this letter we prove the converse:
every pair of incompatible quantum observables enables the violation of a Bell
inequality and therefore must remain incompatible within any other no-signaling
theory. While in the case of von Neumann measurements it is sufficient to use
the same pair of observables at both sites, general measurements can require
different choices. The main result is obtained by showing that for arbitrary
dimension the CHSH inequality provides the Lagrangian dual of the
characterization of joint measurability. This leads to a simple criterion for
joint measurability beyond the known qubit case.Comment: 4 page
Local productivity does not control the balance between plankton photosynthesis and respiration in the open Atlantic Ocean
Qubit authentication
Secure communication requires message authentication. In this paper we
address the problem of how to authenticate quantum information sent through a
quantum channel between two communicating parties with the minimum amount of
resources. Specifically, our objective is to determine whether one elementary
quantum message (a qubit) can be authenticated with a key of minimum length. We
show that, unlike the case of classical-message quantum authentication, this is
not possible.Comment: LaTeX, 8 page
Quantum phase transitions of atom-molecule Bose mixtures in a double-well potential
The ground state and spectral properties of Bose gases in double-well
potentials are studied in two different scenarios: i) an interacting atomic
Bose gas, and ii) a mixture of an atomic gas interacting with diatomic
molecules. A ground state second-order quantum phase transition (QPT) is
observed in both scenarios. For large attractive values of the atom-atom
interaction, the ground-state is degenerate. For repulsive and small attractive
interaction, the ground-state is not degenerate and is well approximated by a
boson coherent state. Both systems depict an excited state quantum phase
transition (ESQPT). For the mixed atom-molecule system the critical point of
the ESQPT displays a discontinuity in the first derivative of the density of
states.Comment: 25 pages, 18 figures. RevTex 4.1 (version to appear in Phys. Rev. E
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