14 research outputs found
MVF-Net: Multi-View 3D Face Morphable Model Regression
We address the problem of recovering the 3D geometry of a human face from a
set of facial images in multiple views. While recent studies have shown
impressive progress in 3D Morphable Model (3DMM) based facial reconstruction,
the settings are mostly restricted to a single view. There is an inherent
drawback in the single-view setting: the lack of reliable 3D constraints can
cause unresolvable ambiguities. We in this paper explore 3DMM-based shape
recovery in a different setting, where a set of multi-view facial images are
given as input. A novel approach is proposed to regress 3DMM parameters from
multi-view inputs with an end-to-end trainable Convolutional Neural Network
(CNN). Multiview geometric constraints are incorporated into the network by
establishing dense correspondences between different views leveraging a novel
self-supervised view alignment loss. The main ingredient of the view alignment
loss is a differentiable dense optical flow estimator that can backpropagate
the alignment errors between an input view and a synthetic rendering from
another input view, which is projected to the target view through the 3D shape
to be inferred. Through minimizing the view alignment loss, better 3D shapes
can be recovered such that the synthetic projections from one view to another
can better align with the observed image. Extensive experiments demonstrate the
superiority of the proposed method over other 3DMM methods.Comment: 2019 Conference on Computer Vision and Pattern Recognitio
PLASMA GALECTIN-3 LEVELS AND RECURRENT ARRHYTHMIA AFTER SUCCESSFUL ABLATION OF LONE ATRIAL FIBRILLATOIN
Towards efficient photoinduced charge separation in carbon nanodots and TiO 2
In this work, photoinduced charge separation behaviors in non-long-chain-molecule-functionalized carbon nanodots (CDs) with visible intrinsic absorption (CDs-V) and TiO2 composites were investigated. Efficient photoinduced electron injection from CDs-V to TiO2 with a rate of 8.8 × 108 s−1 and efficiency of 91% was achieved in the CDs-V/TiO2 composites. The CDs-V/TiO2 composites exhibited excellent photocatalytic activity under visible light irradiation, superior to pure TiO2 and the CDs with the main absorption band in the ultraviolet region and TiO2 composites, which indicated that visible photoinduced electrons and holes in such CDs-V/TiO2 composites could be effectively separated. The incident photon-to-current conversion efficiency (IPCE) results for the CD-sensitized TiO2 solar cells also agreed with efficient photoinduced charge separation between CDs-V and the TiO2 electrode in the visible range. These results demonstrate that non-long-chain-molecule-functionlized CDs with a visible intrinsic absorption band could be appropriate candidates for photosensitizers and offer a new possibility for the development of a well performing CD-based photovoltaic system
Synthesis and adsorption properties of flower-like layered double hydroxide by a facile one-pot reaction with an eggshell membrane as assistant
PLASMA GALECTIN-3 LEVELS AND RECURRENT ARRHYTHMIA AFTER SUCCESSFUL ABLATION OF LONE ATRIAL FIBRILLATOIN
Photo-Cross-Linkable Polymer Dots with Stable Sensitizer Loading and Amplified Singlet Oxygen Generation for Photodynamic Therapy
Photodynamic
therapy (PDT) is a promising treatment modality for clinical cancer
therapy. However, the therapeutic effect of PDT is strongly dependent
on the property of photosensitizer. Here, we developed photo-cross-linkable
semiconductor polymer dots doped with photosensitizer Chlorin e6 (Ce6)
to construct a nanoparticle platform for photodynamic therapy. Photoreactive
oxetane groups were attached to the side chains of the semiconductor
polymer. After photo-cross-linking reaction, the Ce6-doped Pdots formed
an interpenetrated structure to prevent Ce6 leaching out from the
Pdot matrix. Spectroscopic characterizations revealed an efficient
energy transfer from the polymer to Ce6 molecules, resulting in amplified
generation of singlet oxygen. We evaluated the cellular uptake, cytotoxicity,
and photodynamic effect of the Pdots in gastric adenocarcinoma cells.
In vitro photodynamic experiments indicated that the Ce6-doped Pdots
(∼10 μg/mL) effectively killed the cancer cells under
low dose of light irradiation (∼60 J/cm<sup>2</sup>). Furthermore,
in vivo photodynamic experiments were carried out in tumor-bearing
nude mice, which indicated that the Pdot photosensitizer apparently
suppressed the growth of solid tumors. Our results demonstrate that
the photo-cross-linkable Pdots doped with photosensitizer are promising
for photodynamic cancer treatment
Appl. Phys. Lett.
A lack of dependence of the Raman frequency of optical vibrational modes on excitation wavelength in polar nanosemiconductors was observed. This is in contrast to the earlier observed dependence in nonpolar nanomaterials: carbon nanotubes and Si nanowires. This difference has been ascribed to the different crystallographic natures of their Raman spectra: crystalline for nonpolar and amorphous for polar nanosemiconductors. The result has been explored theoretically to the Raman spectra being insensitive to sample sizes and thus indicates that the size confinement effect, a basic effect in nanomaterials, does not exhibit in the optical vibrational modes of polar nanosemiconductors. (c) 2006 American Institute of Physics.A lack of dependence of the Raman frequency of optical vibrational modes on excitation wavelength in polar nanosemiconductors was observed. This is in contrast to the earlier observed dependence in nonpolar nanomaterials: carbon nanotubes and Si nanowires. This difference has been ascribed to the different crystallographic natures of their Raman spectra: crystalline for nonpolar and amorphous for polar nanosemiconductors. The result has been explored theoretically to the Raman spectra being insensitive to sample sizes and thus indicates that the size confinement effect, a basic effect in nanomaterials, does not exhibit in the optical vibrational modes of polar nanosemiconductors. (c) 2006 American Institute of Physics