437 research outputs found
Multi-Write distributor bus
Abstract. This thesis studies the design and verification for Multi-Write distribution with AMBA AXI protocol to reduce the SW execution time. First, Bus protocol and microarchitecture is looked at and Verilog/VHDL coding processes are studied. And appropriate verification method is examined. Last challenges/open items and possibilities for the future improvements are discussed. The development of standalone design/verification environment build is covered in the work.
Moni-kirjoitus jakeluväylä. Tiivistelmä. Tässä opinnäytetyössä tutkitaan monikirjoitusjakelijan suunnittelua ja verifiointia AMBA AXI protokollalla ohjelmiston suoritusajan lyhentämiseksi. Ensin tarkastellaan väyläprotokollaa ja mikroarkkitehtuuria ja tutkitaan Verilog/VHDL koodausprosesseja sekä asianmukaisia verifikaatio menetelmiä. Viimeiseksi keskustellaan haasteista/avoimista kohteista ja mahdollisista tulevaisuuden parannuksista. Työssä käsitellään erillisen suunnittelu-/todentamisympäristön rakentamisen kehittämistä
Kohn-Sham potential with discontinuity for band gap materials
We model a Kohn-Sham potential with a discontinuity at integer particle
numbers derived from the GLLB approximation of Gritsenko et al. We evaluate the
Kohn-Sham gap and the discontinuity to obtain the quasiparticle gap. This
allows us to compare the Kohn-Sham gaps to those obtained by accurate many-body
perturbation theory based optimized potential methods. In addition, the
resulting quasiparticle band gap is compared to experimental gaps. In the GLLB
model potential, the exchange-correlation hole is modeled using a GGA energy
density and the response of the hole to density variations is evaluated by
using the common-denominator approximation and homogeneous electron gas based
assumptions. In our modification, we have chosen the PBEsol potential as the
GGA to model the exchange hole, and add a consistent correlation potential. The
method is implemented in the GPAW code, which allows efficient parallelization
to study large systems. A fair agreement for Kohn-Sham and the quasiparticle
band gaps with semiconductors and other band gap materials is obtained with a
potential which is as fast as GGA to calculate.Comment: submitted to Physical Review
Quantum transitions induced by the third cumulant of current fluctuations
We investigate the transitions induced by external current fluctuations on a
small probe quantum system. The rates for the transitions between the energy
states are calculated using the real-time Keldysh formalism for the density
matrix evolution. We especially detail the effects of the third cumulant of
current fluctuations inductively coupled to a quantum bit and propose a setup
for detecting the frequency-dependent third cumulant through the transitions it
induces.Comment: 4 pages, 3 figure
Detection of aphid migrations in Finland
Our insect immigration warning system was built on the atmospheric dispersion model that has been used in predicting long-range transport of airborne pollen. We observed immigrations with a trap network consisting of rotating tow-nets, yellow sticky traps, and suction traps.
Based on our studies the aphids can be detected with radars when they occur in large numbers
Equivalent qubit dynamics under classical and quantum noise
We study the dynamics of quantum systems under classical and quantum noise,
focusing on decoherence in qubit systems. Classical noise is described by a
random process leading to a stochastic temporal evolution of a closed quantum
system, whereas quantum noise originates from the coupling of the microscopic
quantum system to its macroscopic environment. We derive deterministic master
equations describing the average evolution of the quantum system under
classical continuous-time Markovian noise and two sets of master equations
under quantum noise. Strikingly, these three equations of motion are shown to
be equivalent in the case of classical random telegraph noise and proper
quantum environments. Hence fully quantum-mechanical models within the Born
approximation can be mapped to a quantum system under classical noise.
Furthermore, we apply the derived equations together with pulse optimization
techniques to achieve high-fidelity one-qubit operations under random telegraph
noise, and hence fight decoherence in these systems of great practical
interest.Comment: 5 pages, 2 figures; converted to PRA format, added Fig. 2, corrected
typo
Direct Aggression and the Balance between Status and Affection Goals in Adolescence
Previous studies have shown that status goals motivate direct forms of interpersonal aggression. However, status goals have been studied mostly in isolation from affection goals. It is theorized that the means by which status and affection goals are satisfied change during adolescence, which can affect aggression. This is tested in a pooled sample of (pre)adolescents (N = 1536; 49% girls; ages 10-15), by examining associations between status goals and direct aggression and the moderating role of affection goals. As hypothesized, with increasing age, status goals were more strongly associated with direct aggression. Moreover, for older adolescents, status goals were only associated with aggression when affection goals were weak. These findings support the changing relationship between status goals and direct aggression during adolescence
State-dependent impedance of a strongly coupled oscillator-qubit system
We investigate the measurements of two-state quantum systems (qubits) at
finite temperatures using a resonant harmonic oscillator as a quantum probe.
The reduced density matrix and oscillator correlators are calculated by a
scheme combining numerical methods with an analytical perturbation theory.
Correlators provide us information about the system impedance, which depends on
the qubit state. We show in detail how this property can be exploited in the
qubit measurement.Comment: 8 pages, 16 image
Mesoscopic persistent currents in a strong magnetic field
Recent precision measurements of mesoscopic persistent currents in
normal-metal rings rely on the interaction between the magnetic moment
generated by the current and a large applied magnetic field. Motivated by this
technique, we extend the theory of mesoscopic persistent currents to include
the effect of the finite thickness of the ring and the resulting penetration of
the large magnetic field. We discuss both the sample-specific typical current
and the ensemble-averaged current which is dominated by the effects of
electron-electron interactions. We find that the magnetic field strongly
suppresses the interaction-induced persistent current and so provides direct
access to the independent-electron contribution. Moreover, the technique allows
for measurements of the entire distribution function of the persistent current.
We also discuss the consequences of the Zeeman splitting and spin-orbit
scattering, and include a detailed and quantitative comparison of our
theoretical results to experimental data.Comment: 12 pages, 7 figure
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