13,444 research outputs found
Generalized Bargmann functions, their growth and von Neumann lattices
Generalized Bargmann representations which are based on generalized coherent
states are considered. The growth of the corresponding analytic functions in
the complex plane is studied. Results about the overcompleteness or
undercompleteness of discrete sets of these generalized coherent states are
given. Several examples are discussed in detail.Comment: 9 pages, changes with respect to previous version: typos removed,
improved presentatio
Chaotic diffusion of particles with finite mass in oscillating convection flows
Deterministic diffusion in temporally oscillating convection is studied for
particles with finite mass. The particles are assumed to obey a simple
dissipative dynamical system and the particle diffusion is induced by the
strange attractor. The diffusion constants are numerically calculated for
convection models with free and rigid boundary conditions.Comment: 5 figure
Using handheld pocket computers in a wireless telemedicine system
Objectives: To see if senior emergency nurse practitioners can provide support to
inexperienced ones in a Minor Injuries Unit by using a wireless LAN system of
telemedicine transmitting images to a PDA when they were on duty. In addition,
whether such a system could be sufficiently accurate to make clinical diagnoses with
a high level of diagnostic confidence. This would permit an overall lower grade of
nurse to be employed to manage most of the cases as they arrive with a proportionate
lowering of costs.
Methods: The wireless LAN equipment could roam in the Minor Injuries Unit and
the experienced emergency Nurse practitioners could be at home, shopping or even
at a considerable distance from the centre.
Thirty pictorial images of patients who had been sent to the Review Clinic were
transmitted to a PDA various distances of one to sixteen miles from the centre. Two
senior emergency nurse practitioners viewed the images and opined on the diagnosis,
their degree of confidence in the diagnosis and their opinion of the quality of the
image.
Results: the images of patients were sharp, clear, and of diagnostic quality. The
image quality was only uncertain, as was the level of confidence of the diagnosis if
the patient was very dark skinned.
Conclusions: The wireless LAN system works with a remote PDA in this clinical
situation. However there are question marks over the availability of enough
experienced emergency nurse practitioners to staff a service that provides senior
cover for longer parts of the day and at weekends
A product formula and combinatorial field theory
We treat the problem of normally ordering expressions involving the standard boson operators a, ay where [a; ay] = 1. We show that a simple product formula for formal power series | essentially an extension of the Taylor expansion | leads to a double exponential formula which enables a powerful graphical description of the generating functions of the combinatorial sequences associated with such functions | in essence, a combinatorial eld theory. We apply these techniques to some examples related to specic physical Hamiltonians
Hopf Algebras in General and in Combinatorial Physics: a practical introduction
This tutorial is intended to give an accessible introduction to Hopf
algebras. The mathematical context is that of representation theory, and we
also illustrate the structures with examples taken from combinatorics and
quantum physics, showing that in this latter case the axioms of Hopf algebra
arise naturally. The text contains many exercises, some taken from physics,
aimed at expanding and exemplifying the concepts introduced
Microfinance and Entrepreneurship: The Enabling Role of Social Capital Among Female Entrepreneurs
Purpose
This paper examines mechanisms through which social capital strengthens microfinance impact on fostering female entrepreneurial success. Specifically, the study focuses on how, and to what extent, resources embedded in social networks determine MF impact on entrepreneurial success.
Design/methodology/approach
Survey data were collected from 276 female micro-institutions entrepreneurs using multi-stage stratified random sampling across 80 MF institutions in three South-Western Nigerian states. Hypotheses were tested using ordinal regression analysis.
Findings
The study found that relational and network social capital had a positive and significant influence on female entrepreneurial success. Specifically, intra-group trust and productive network ties amongst female entrepreneurs in poor communities predicated the positive impact of MF on entrepreneurial success. Also, resources embedded in networks are more positively correlated to education level and marital status. Furthermore, MF could have more positive impact for borrowers with sustainable relationships with loan officers who organise MF provisions and understand the entrepreneursâ context.
Originality/value
The research provides empirical evidence for the relationship dynamics between female entrepreneurs and MF institutions, by emphasising the importance of deploying different forms of social capital in sustaining MF impact on female entrepreneurial success
Coherent pairing states for the Hubbard model
We consider the Hubbard model and its extensions on bipartite lattices. We
define a dynamical group based on the -pairing operators introduced by
C.N.Yang, and define coherent pairing states, which are combinations of
eigenfunctions of -operators. These states permit exact calculations of
numerous physical properties of the system, including energy, various
fluctuations and correlation functions, including pairing ODLRO to all orders.
This approach is complementary to BCS, in that these are superconducting
coherent states associated with the exact model, although they are not
eigenstates of the Hamiltonian.Comment: 5 pages, RevTe
Microfinance and Entrepreneurship: The Enabling Role of Social Capital
Although scholars highlight the importance of social capital for accessing various resources embedded in social networks, little is known about the mechanisms through which social capital strengthens the impact of micro-finance on fostering entrepreneurship. Drawing on forms of social capital, this paper seeks to examine how, and to what extent resources embedded in social networks determine the impact of micro-finance on entrepreneurial success
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