1,377 research outputs found
Resolution Improvement for OpticalCoherence Tomography based on Sparse Continuous Deconvolution
We propose an image resolution improvement method for optical coherence
tomography (OCT) based on sparse continuous deconvolution. Traditional
deconvolution techniques such as Lucy-Richardson deconvolution suffers from the
artifact convergence problem after a small number of iterations, which brings
limitation to practical applications. In this work, we take advantage of the
prior knowledge about the sample sparsity and continuity to constrain the
deconvolution iteration. Sparsity is used to achieve the resolution improvement
through the resolution preserving regularization term. And the continuity based
on the correlation of the grayscale values in different directions is
introduced to mitigate excessive image sparsity and noise reduction through the
continuity regularization term. The Bregman splitting technique is then used to
solve the resulting optimization problem. Both the numerical simulation study
and experimental study on phantoms and biological samples show that our method
can suppress artefacts of traditional deconvolution techniques effectively.
Meanwhile, clear resolution improvement is demonstrated. It achieved nearly
twofold resolution improvement for phantom beads image that can be
quantitatively evaluate
Existence of seven human IL-1R1 promoters
Previous studies have reported the existence of three promoters for the human type I interleukin-1 receptor (hIL-1R1) gene. These promoters were discovered by identifying discrete transcription start sites (TSS) from limited human cell lines. In this study, we examined the TSSs of hIL-1R1 mRNA from 24 different tissues and identified several novel TSSs in hIL-1R1 that suggest the existence of seven hIL-1R1 promoters: three of them are the same as those reported previously and four are putative novel promoters. Using a promoter-reporter assay, we show here that these promoters can drive the transcription of the reporter gene. In addition, these promoters exhibit cell type specific expression patterns and they can be regulated by enhancer elements in a cell type specific manner. Only one of the promoters was found to be sensitive to the stimulation by glucocorticoids. Similar to our recent report on murine IL-1R1, two of the hIL-1R1 promoters appear to be the dominant promoters, one of which was published previously and the other is identified in the present study. We also found an internal promoter that drives the expression of IL-1R1 after the conventional translation start codon, suggesting that a truncated hIL-1R1 may be expressed by this promoter. These results provide additional information regarding the transcription of hIL-1R1
Fragments of asthenosphere incorporated in the lithospheric mantle underneath the Subei Basin, eastern China: Constraints from geothermobarometric results and water contents of peridotite xenoliths in Cenozoic basalts
Anhydrous, medium/coarse-grained spinel bearing mantle xenoliths from the Subei Basin, Eastern China have mineral arrangements that reflect low energy geometry. Because of clinopyroxene modal contents, they are grouped into cpx-rich lherzolites (cpx ≥ 14percentage), lherzolites (8 5My, based on modelled H2O solid-solid diffusion rate) the occurrence of the last melting episode. Keywords: Water contents, Fertile mantle, Melting models, Water diffusion, Asthenosphere/lithospher
Rega-Net:Retina Gabor Attention for Deep Convolutional Neural Networks
Extensive research works demonstrate that the attention mechanism in
convolutional neural networks (CNNs) effectively improves accuracy. But little
works design attention mechanisms using large receptive fields. In this work,
we propose a novel attention method named Rega-net to increase CNN accuracy by
enlarging the receptive field. Inspired by the mechanism of the human retina,
we design convolutional kernels to resemble the non-uniformly distributed
structure of the human retina. Then, we sample variable-resolution values in
the Gabor function distribution and fill these values in retina-like kernels.
This distribution allows important features to be more visible in the center
position of the receptive field. We further design an attention module
including these retina-like kernels. Experiments demonstrate that our Rega-Net
achieves 79.963\% top-1 accuracy on ImageNet-1K classification and 43.1\% mAP
on COCO2017 object detection. The mAP of the Rega-Net increased by up to 3.5\%
compared to baseline networks
Single-shot quantitative differential phase contrast imaging combined with programmable polarization multiplexing illumination
We propose a single-shot quantitative differential phase contrast (DPC)
method with polarization multiplexing illumination. In the illumination module
of our system, the programmable LED array is divided into four quadrants and
covered with polarizing films of four different polarization angles. We use a
polarization camera with polarizers before the pixels in the imaging module. By
matching the polarization angle between the polarizing films over the custom
LED array and the polarizers in the camera, two sets of asymmetric illumination
acquisition images can be calculated from a single-shot acquisition image.
Combined with the phase transfer function, we can calculate the quantitative
phase of the sample. We present the design, implementation, and experimental
image data demonstrating the ability of our method to obtain quantitative phase
images of the phase resolution target, as well as Hela cells.Comment: 5 pages,4figure
Dynamics of quantum entanglement in the reservoir with memory effects
The non-Markovian dynamics of quantum entanglement is studied by the
Shabani-Lidar master equation when one of entangled quantum systems is coupled
to a local reservoir with memory effects. The completely positive reduced
dynamical map can be constructed in the Kraus representation. Quantum
entanglement decays more slowly in the non-Markovian environment. The
decoherence time for quantum entanglement can be markedly increased by the
change of the memory kernel. It is found out that the entanglement sudden death
between quantum systems and entanglement sudden birth between the system and
reservoir occur at different instants.Comment: 14 pages, 3 figure
Injectable Nano-Network for Glucose-Mediated Insulin Delivery
Diabetes mellitus, a disorder of glucose regulation, is a global burden affecting 366 million people across the world. An artificial “closed-loop” system able to mimic pancreas activity and release insulin in response to glucose level changes has the potential to improve patient compliance and health. Herein we develop a glucose-mediated release strategy for the self-regulated delivery of insulin using an injectable and acid-degradable polymeric network. Formed by electrostatic interaction between oppositely charged dextran nanoparticles loaded with insulin and glucose-specific enzymes, the nanocomposite-based porous architecture can be dissociated and subsequently release insulin in a hyperglycemic state through the catalytic conversion of glucose into gluconic acid. In vitro insulin release can be modulated in a pulsatile profile in response to glucose concentrations. In vivo studies validated that these formulations provided improved glucose control in type 1 diabetic mice subcutaneously administered with a degradable nano-network. A single injection of the developed nano-network facilitated stabilization of the blood glucose levels in the normoglycemic state (\u3c200 mg/dL) for up to 10 days
- …