30,377 research outputs found
How Bebop Came to Be: The Early History of Modern Jazz
Bebop, despite its rather short lifespan, would become a key influence for every style that came after it. Bebop’s effects on improvisation, group structure, and harmony would be felt throughout jazz for decades to come, and the best known musicians of the bebop era are still regarded as some of the finest jazz musicians to ever take the stage. But the characteristics of bebop can easily be determined from the music itself. [excerpt
Business angels
Business angels are conventionally defined as high net worth individuals who invest their own money, along with their time and expertise, directly in unquoted companies in which they have no family connection, in the hope of financial gain. The term angel was coined by Broadway insiders in the early 1900s to describe wealthy theatre-goers who made high risk investments in theatrical productions. Angels invested in these shows primarily for the privilege of rubbing shoulders with the theatre personalities that they admired. The term business angel was given to those individuals who perform essentially the same function in a business context (Benjamin and Margulis, 2000: 5). There is a long tradition of angel investing in businesses (Sohl, 2003). Moreover, angel investing is now an international phenomenon, found in all developed economies and now diffusing to emerging economies such as China (Lui Tingchi, and Chen Po Chang,, 2007). However, it has only attracted the attention of researchers since the 1980s
Business angel investing
Business angels are conventionally defined as high net worth individuals who invest their own money, along with their time and expertise, directly in unquoted companies in which they have no family connection, in the hope of financial gain. The term angel was coined by Broadway insiders in the early 1900s to describe wealthy theatre-goers who made high risk investments in theatrical productions. Angels invested in these shows primarily for the privilege of rubbing shoulders with the theatre personalities that they admired. The term business angel was given to those individuals who perform essentially the same function in a business context (Benjamin and Margulis, 2000: 5). There is a long tradition of angel investing in businesses (Sohl, 2003). Moreover, angel investing is now an international phenomenon, found in all developed economies and now diffusing to emerging economies such as China (Lui Tingchi, and Chen Po Chang,, 2007). However, it has only attracted the attention of researchers since the 1980s
Deterministically driven random walks in a random environment on Z
We introduce the concept of a deterministic walk in a deterministic
environment on a countable state space (DWDE). For the deterministic walk in a
fixed environment we establish properties analogous to those found in Markov
chain theory, but for systems that do not in general have the Markov property.
In particular, we establish hypotheses ensuring that a DWDE on is either
recurrent or transient. An immediate consequence of this result is that a
symmetric DWDE on is recurrent. Moreover, in the transient case, we show
that the probability that the DWDE diverges to is either 0 or 1. In
certain cases we compute the direction of divergence in the transient case
Features in Evanescent Aharonov-Bohm interferometry
In this work we analyze an Aharonov-Bohm interferometer in the tunneling
regime. In this regime, current magnification effect which arises in presence
of transport currents is absent. A slight modification in the form of a quantum
well incorporated in one of the arms leads to revival of current magnification.
Systematics in magneto-conductance oscillations are observed in this evanescent
wave geometry. In this framework we also see absence of Fano lineshapes in
transmission resonances but once again one can recover these if the direct path
supports propagating modes.Comment: 7 pages, 7 figures. Minor changes made. Accepted for publication in
Phys. Rev.
Current magnification effect in mesoscopic systems at equilibrium
We study the current magnification effect and associated circulating currents
in mesoscopic systems at equilibrium. Earlier studies have revealed that in the
presence of transport current(non-equilibrium situation), circulating currents
can flow in a ring even in the absence of magnetic field. This was attributed
to current magnification which is quantum mechanical in origin. We have shown
that the same effect can be obtained in equilibrium systems, however, in the
presence of magnetic flux. For this we have considered an one-dimensional open
mesoscopic ring connected to a bubble, and the system is in contact with a
single reservoir. We have considered a special case where bubble does not
enclose magnetic flux, yet circulating currents can flow in it due to current
magnification.Comment: 4 pages, 4 figures. Minor corrections made and journal reference
adde
Equilibrium currents in quantum double ring system: A non-trivial role of system-reservoir coupling
Amperes law states that the magnetic moment of a ring is given by current
times the area enclosed. Also from equilibrium statistical mechanics it is
known that magnetic moment is the derivative of free energy with respect to
magnetic field. In this work we analyze a quantum double ring system
interacting with a reservoir. A simple S-Matrix model is used for
system-reservoir coupling. We see complete agreement between the aforesaid two
definitions when coupling between system and reservoir is weak, increasing the
strength of coupling parameter however leads to disagreement between the two.
Thereby signifying the important role played by the coupling parameter in
mesoscopic systems.Comment: 6 pages, 3 figure
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