254 research outputs found
Realization of the N(odd)-dimensional Quantum Euclidean Space by Differential Operators
The quantum Euclidean space R_{q}^{N} is a kind of noncommutative space which
is obtained from ordinary Euclidean space R^{N} by deformation with parameter
q. When N is odd, the structure of this space is similar to R_{q}^{3}.
Motivated by realization of R_{q}^{3} by differential operators in R^{3}, we
give such realization for R_{q}^{5} and R_{q}^{7} cases and generalize our
results to R_{q}^{N} (N odd) in this paper, that is, we show that the algebra
of R_{q}^{N} can be realized by differential operators acting on C^{infinite}
functions on undeformed space R^{N}.Comment: 10 pages, LaTe
Properties of h-deformed quantum (super)matrices
We investigate the -deformed quantum (super)group of matrices
and use a kind of contraction procedure to prove that the -th power of this
deformed quantum (super)matrix is quantum (super)matrix with the deformation
parameter .Comment: Accepted by International Journal of Theoretical Physic
Highly efficient CO2 capture with simultaneous iron and CaO recycling for the iron and steel industry
An efficient CO2 capture process has been developed by integrating calcium looping (CaL) and waste recycling technologies into iron and steel production. A key advantage of such a process is that CO2 capture is accompanied by simultaneous iron and CaO recycling from waste steel slag. High-purity CaO-based CO2 sorbents, with CaO content as high as 90 wt%, were prepared easily via acid extraction of steel slag using acetic acid. The steel slag-derived CO2 sorbents exhibited better CO2 reactivity and slower (linear) deactivation than commercial CaO during calcium looping cycles. Importantly, the recycling efficiency of iron from steel slag with an acid extraction is improved significantly due to a simultaneous increase in the recovery of iron-rich materials and the iron content of the materials recovered. High-quality iron ore with iron content of 55.1–70.6% has been recovered from waste slag in this study. Although costing nearly six times as much as naturally derived CaO in the purchase of feedstock, the final cost of the steel slag-derived, CaO-based sorbent developed is compensated by the byproducts recovered, i.e., high-purity CaO, high-quality iron ore, and acetone. This could reduce the cost of the steel slag-derived CO2 sorbent to 57.7 € t−1, appreciably lower than that of the naturally derived CaO. The proposed integrated CO2 capture process using steel slag-derived, CaO-based CO2 sorbents developed appears to be cost-effective and promising for CO2 abatement from the iron and steel industry
TimbreTron: A WaveNet(CycleGAN(CQT(Audio))) Pipeline for Musical Timbre Transfer
In this work, we address the problem of musical timbre transfer, where the
goal is to manipulate the timbre of a sound sample from one instrument to match
another instrument while preserving other musical content, such as pitch,
rhythm, and loudness. In principle, one could apply image-based style transfer
techniques to a time-frequency representation of an audio signal, but this
depends on having a representation that allows independent manipulation of
timbre as well as high-quality waveform generation. We introduce TimbreTron, a
method for musical timbre transfer which applies "image" domain style transfer
to a time-frequency representation of the audio signal, and then produces a
high-quality waveform using a conditional WaveNet synthesizer. We show that the
Constant Q Transform (CQT) representation is particularly well-suited to
convolutional architectures due to its approximate pitch equivariance. Based on
human perceptual evaluations, we confirmed that TimbreTron recognizably
transferred the timbre while otherwise preserving the musical content, for both
monophonic and polyphonic samples.Comment: 17 pages, published as a conference paper at ICLR 201
Charged coherent states related to su_{q}(2) covariance
A new kind of q-deformed charged coherent states is constructed in Fock space
of two-mode q-boson system with su_{q}(2) covariance and a resolution of unity
for these states is derived. We also present a simple way to obtain these
coherent states using state projection method.Comment: 7 pages. To appear in Modern Phyics Letter:
LogicNet: A Logical Consistency Embedded Face Attribute Learning Network
Ensuring logical consistency in predictions is a crucial yet overlooked
aspect in multi-attribute classification. We explore the potential reasons for
this oversight and introduce two pressing challenges to the field: 1) How can
we ensure that a model, when trained with data checked for logical consistency,
yields predictions that are logically consistent? 2) How can we achieve the
same with data that hasn't undergone logical consistency checks? Minimizing
manual effort is also essential for enhancing automation. To address these
challenges, we introduce two datasets, FH41K and CelebA-logic, and propose
LogicNet, an adversarial training framework that learns the logical
relationships between attributes. Accuracy of LogicNet surpasses that of the
next-best approach by 23.05%, 9.96%, and 1.71% on FH37K, FH41K, and
CelebA-logic, respectively. In real-world case analysis, our approach can
achieve a reduction of more than 50% in the average number of failed cases
compared to other methods
High-Resolution Volumetric Reconstruction for Clothed Humans
We present a novel method for reconstructing clothed humans from a sparse set
of, e.g., 1 to 6 RGB images. Despite impressive results from recent works
employing deep implicit representation, we revisit the volumetric approach and
demonstrate that better performance can be achieved with proper system design.
The volumetric representation offers significant advantages in leveraging 3D
spatial context through 3D convolutions, and the notorious quantization error
is largely negligible with a reasonably large yet affordable volume resolution,
e.g., 512. To handle memory and computation costs, we propose a sophisticated
coarse-to-fine strategy with voxel culling and subspace sparse convolution. Our
method starts with a discretized visual hull to compute a coarse shape and then
focuses on a narrow band nearby the coarse shape for refinement. Once the shape
is reconstructed, we adopt an image-based rendering approach, which computes
the colors of surface points by blending input images with learned weights.
Extensive experimental results show that our method significantly reduces the
mean point-to-surface (P2S) precision of state-of-the-art methods by more than
50% to achieve approximately 2mm accuracy with a 512 volume resolution.
Additionally, images rendered from our textured model achieve a higher peak
signal-to-noise ratio (PSNR) compared to state-of-the-art methods
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