72,769 research outputs found
Unipolar Resistance Switching in Amorphous High-k dielectrics Based on Correlated Barrier Hopping Theory
We have proposed a kind of nonvolatile resistive switching memory based on
amorphous LaLuO3, which has already been established as a promising candidate
of high-k gate dielectric employed in transistors. Well-developed unipolar
switching behaviors in amorphous LaLuO3 make it suited for not only logic but
memory applications using the conventional semiconductor or the emerging
nano/CMOS architectures. The conduction transition between high- and low-
resistance states is attributed to the change in the separation between oxygen
vacancy sites in the light of the correlated barrier hopping theory. The mean
migration distances of vacancies responsible for the resistive switching are
demonstrated in nanoscale, which could account for the ultrafast programming
speed of 6 ns. The origin of the distributions in switching parameters in
oxides can be well understood according to the switching principle.
Furthermore, an approach has also been developed to make the operation voltages
predictable for the practical applications of resistive memories.Comment: 18 pages, 6 figure
Proof of the deadlock-freeness of ALD routing algorithm
This is the appendix to the paper Load-Balanced Adaptive Routing for Torus Networks to provide a detailed, formal proof of the deadlock-freeness of the routing algorithm proposed in the paper. The paper is submitted to Electronics Letters, and the abstract of which is as follows:
A new routing algorithm for torus interconnection networks to achieve high throughput on various traffic patterns, Adaptive Load-balanced routing with cycle Detection (ALD), is presented. Instead of the -channels scheme adopted in a few recently proposed algorithms of the same category, a cycle detection scheme is employed in ALD to handle deadlock, which leads to higher routing adaptability. Simulation results demonstrate that ALD achieves higher throughput than the recently proposed algorithms on both benign and adversarial traffic patterns
An Ultra Low Mass and Small Radius Compact Object in 4U 1746-37?
Photospheric radius expansion (PRE) bursts have already been used to
constrain the masses and radii of neutron stars. RXTE observed three PRE bursts
in 4U 1746-37, all with low touchdown fluxes. We discuss here the possibility
of low mass neutron star in 4U 1746-37 because the Eddington luminosity depends
on stellar mass. With typical values of hydrogen mass fraction and color
correction factor, a Monte-Carlo simulation was applied to constrain the mass
and radius of neutron star in 4U 1746-37. 4U 1746-37 has a high inclination
angle. Two geometric effects, the reflection of the far side accretion disc and
the obscuration of the near side accretion disc have also been included in the
mass and radius constraints of 4U 1746-37. If the reflection of the far side
accretion disc is accounted, a low mass compact object (mass of
and radius of at 68% confidence)
exists in 4U 1746-37. If another effect operated, 4U 1746-37 may contain an
ultra low mass and small radius object
( at 68% confidence). Combined
all possibilities, the mass of 4U 1746-37 is at
99.7% confidence. For such low mass NS, it could be reproduced by a self-bound
compact star, i.e., quark star or quark-cluster star.Comment: accepted by Ap
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