58,071 research outputs found
Side-looking radar in urban research - A case study
Capabilities of side-looking radar in urban researc
Some Comments on Branes, G-flux, and K-theory
This is a summary of a talk at Strings2000 explaining three ways in which
string theory and M-theory are related to the mathematics of K-theory.Comment: 10pp., late
Circuit controls transients in SCR inverters
Elimination of starting difficulties in SCR inverters is accomplished by the addition of two taps of the output winding of the inverter. On starting or under transient loads, the two additional taps deliver power through diodes without requiring quenching of SCR currents in excess of normal starting load
Remote sensor imagery in urban research - Some potentialities and problem
Imaging techniques of urban data collection for development and plannin
Multi-Frequency Magnonic Logic Circuits for Parallel Data Processing
We describe and analyze magnonic logic circuits enabling parallel data
processing on multiple frequencies. The circuits combine bi-stable (digital)
input/output elements and an analog core. The data transmission and processing
within the analog part is accomplished by the spin waves, where logic 0 and 1
are encoded into the phase of the propagating wave. The latter makes it
possible to utilize a number of bit carrying frequencies as independent
information channels. The operation of the magnonic logic circuits is
illustrated by numerical modeling. We also present the estimates on the
potential functional throughput enhancement and compare it with scaled CMOS.
The described multi-frequency approach offers a fundamental advantage over the
transistor-based circuitry and may provide an extra dimension for the Moor's
law continuation. The shortcoming and potentials issues are also discussed
Majorana fermion chain at the Quantum Spin Hall edge
We study a realization of a 1d chain of Majorana bound states at the
interfaces between alternating ferromagnetic and superconducting regions at a
quantum spin Hall insulator edge. In the limit of well separated Majoranas, the
system can be mapped to the transverse field Ising model. The disordered
critical point can be reached by tuning the relative magnitude or phases of the
ferromagnetic and superconducting order parameters. We compute the voltage
dependence of the tunneling current from a metallic tip into the Majorana chain
as a direct probe of the random critical state.Comment: 5 pages, 3 figure
Hydrologic significance of lineaments in central Tennessee
There are no author-identified significant results in this report
Investigation to develop a process for production of oxide fibers by melt draw technique Final report
Process for production of oxide fibers by melt draw techniqu
Power conditioning - inversion, conversion, and regulation
Switching element requirements for spacecraft electric power conversion, inversion, and regulatio
Elliptic Genera of Symmetric Products and Second Quantized Strings
In this note we prove an identity that equates the elliptic genus partition
function of a supersymmetric sigma model on the N-fold symmetric product
of a manifold M to the partition function of a second quantized
string theory on the space . The generating function of these
elliptic genera is shown to be (almost) an automorphic form for O(3,2,Z). In
the context of D-brane dynamics, this result gives a precise computation of the
free energy of a gas of D-strings inside a higher-dimensional brane.Comment: 17 pages, latex, 1 figure, to appear in Commun. Math. Phy
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