Results
author = "Liu, Yi"
Fuzzy Logic based Constant Voltage Control of PEM Fuel Cells
Description :
<p>Proton exchange membrane fuel cells have been receiving more and more attention these recent years. Maintaining a fuel cell system in correct operating conditions requires good control. Based on the mathematical model of proton exchange membrane fuel cells described in this paper, the fuzzy...
Repository :
DOAJ-Articles
Language(s) :
Undetermined
On the Information Content Model of Geological Hazard Assessment in the Area of Fuling of Chongqing
Description :
This paper uses the information model, based on several evaluation factors, such as slope, lithology, and land use, distance to surface water, geological faults, and traffic, to assess the geological hazard of the district of Fuling. The district of Fuling will be divided into five geological hazard...
Repository :
DOAJ-Articles
Language(s) :
Undetermined
The Local Consistency Problem for Stoquastic and 1-D Quantum Systems
Author(s) :
Liu, Yi-Kai
Description :
The Local Hamiltonian problem (finding the ground state energy of a quantum
system) is known to be QMA-complete. The Local Consistency problem (deciding
whether descriptions of small pieces of a quantum system are consistent) is
also known to be QMA-complete. Here we consider special cases of Loca...
Repository :
arXiv
Language(s) :
Undetermined
The Complexity of the Consistency and N-representability Problems for Quantum States
Author(s) :
Liu, Yi-Kai
Description :
QMA (Quantum Merlin-Arthur) is the quantum analogue of the class NP. There
are a few QMA-complete problems, most notably the ``Local Hamiltonian'' problem
introduced by Kitaev. In this dissertation we show some new QMA-complete
problems.
The first one is ``Consistency of Local Density Matrices''...
Repository :
arXiv
Language(s) :
Undetermined
Quantum Algorithms Using the Curvelet Transform
Author(s) :
Liu, Yi-Kai
Description :
The curvelet transform is a directional wavelet transform over R^n, which is
used to analyze functions that have singularities along smooth surfaces (Candes
and Donoho, 2002). I demonstrate how this can lead to new quantum algorithms. I
give an efficient implementation of a quantum curvelet transf...
Repository :
arXiv
Language(s) :
Undetermined
Presentation length and Simon's conjecture
Description :
In this paper, we show that any knot group maps onto at most finitely many
knot groups. This gives an affirmative answer to a conjecture of J. Simon. We
also bound the diameter of a closed hyperbolic 3-manifold linearly in terms of
the presentation length of its fundamental group, improving a resu...
Repository :
arXiv
Language(s) :
Undetermined
Universal low-rank matrix recovery from Pauli measurements
Author(s) :
Liu, Yi-Kai
Description :
We study the problem of reconstructing an unknown matrix M of rank r and
dimension d using O(rd poly log d) Pauli measurements. This has applications in
quantum state tomography, and is a non-commutative analogue of a well-known
problem in compressed sensing: recovering a sparse vector from a few ...
Repository :
arXiv
Language(s) :
Undetermined
Relationships between supercontraction and mechanical properties of spider silk
Description :
Typical spider dragline silk tends to outperform other natural fibres and most man-made filaments. However, even small changes in spinning conditions can have large effects on the mechanical properties of a silk fibre as well as on its water uptake. Absorbed water leads to significant shrinkage in a...
Repository :
Oxford University Research Archive (ORA)
Language(s) :
English
Interlocked feedback loops contribute to the robustness of the Neurospora circadian clock
Description :
Interlocked feedback loops may represent a common feature among the regulatory systems controlling circadian rhythms. The Neurospora circadian feedback loops involve white collar-1 (wc-1), wc-2, and frequency (frq) genes. We show that WC-1 and WC-2 proteins activate the transcription of frq gene, wh...
Repository :
Europe PubMed Central
Language(s) :
English
Regulation of the Neurospora circadian clock by casein kinase II
Description :
Phosphorylation of clock proteins represents an important mechanism regulating circadian clocks. In Neurospora, clock protein FREQUENCY (FRQ) is progressively phosphorylated over time, and its level decreases when it is extensively phosphorylated. To identify the kinase phosphorylating FRQ and to un...
Repository :
Europe PubMed Central
Language(s) :
English