249 research outputs found
Co-pyrolysis of Corn-cob and Waste Cooking-oil in a Fixed Bed Reactor with HY Upgrading Process
AbstractCorn cob and waste oil were co-pyrolysed in a fixed bed at the temperatures of 500°C, 550°C, 600°C, respectively, under nitrogen atmosphere. Co-pyrolysis products were investigated with focus on the physical and chemical properties of oily products characterized by means of GC–MS and elemental analyser. The results show 550°C seems to be the optimum temperature considering maximum bio oil yields and bio oil properties. Co-pyrolysis of corn cob and waste oil produced more amount of liquid and less amount of solid residue than that of pyrolysis of corn cob solely. While weight ratio of waste oil: corn cob increases from 0 to 0.87, bio-oil yield increases dramatically from 44.7wt% to 70.62wt% with increasing acids content and decreasing phenols, acohols, ketones content. The upgraded bio-oil has the potential to be an alternative fuel for engine after upgraded by HY zeolite
The Progenitor of Supernova 2004dj in a Star Cluster
The progenitor of type II-plateau supernova (SN) 2004dj is identified with a
supergiant in a compact star cluster known as "Sandage Star 96" (S96) in the
nearby spiral galaxy NGC 2403, which was fortuitously imaged as part of the
Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolor Sky Survey from Feb 1995
to Dec 2003 prior to SN 2004dj. The superior photometry of BATC images for S96,
taken with 14 intermediate-band filters covering 3000-10000\AA, unambiguously
establishes the star cluster nature of S96 with an age of Myr, a
reddening of mag and a total mass of M. The compact star cluster nature of S96 is also consistent
with the lack of light variations in the past decade. The SN progenitor is
estimated to have a main-sequence mass of 12M. The comparison
of our intermediate-band data of S96 with the post-outburst photometry obtained
as the SN has significantly dimmed, may hopefully conclusively establish the
nature of the progenitor.Comment: 4 pages; 3 figures. To accept for Publications in ApJ Letters, but
slightly longer in this perprin
3D-GOI: 3D GAN Omni-Inversion for Multifaceted and Multi-object Editing
The current GAN inversion methods typically can only edit the appearance and
shape of a single object and background while overlooking spatial information.
In this work, we propose a 3D editing framework, 3D-GOI, to enable multifaceted
editing of affine information (scale, translation, and rotation) on multiple
objects. 3D-GOI realizes the complex editing function by inverting the
abundance of attribute codes (object
shape/appearance/scale/rotation/translation, background shape/appearance, and
camera pose) controlled by GIRAFFE, a renowned 3D GAN. Accurately inverting all
the codes is challenging, 3D-GOI solves this challenge following three main
steps. First, we segment the objects and the background in a multi-object
image. Second, we use a custom Neural Inversion Encoder to obtain coarse codes
of each object. Finally, we use a round-robin optimization algorithm to get
precise codes to reconstruct the image. To the best of our knowledge, 3D-GOI is
the first framework to enable multifaceted editing on multiple objects. Both
qualitative and quantitative experiments demonstrate that 3D-GOI holds immense
potential for flexible, multifaceted editing in complex multi-object scenes
Evolution of Galaxy Luminosity Function and Luminosity Function by Density Environment at 0.03<z<0.5
Using galaxy sample observed by the BATC large-field multi-color sky survey
and galaxy data of SDSS in the overlapped fields, we study the dependence of
the restframe -band galaxy luminosity function on redshift and on
large-scale environment. The large-scale environment is defined by isodensity
contour with density contrast \delta\rho/\rho. The data set is a composite
sample of 69,671 galaxies with redshifts 0.03 < z < 0.5 and r < 21.5 mag. The
redshifts are composed by three parts: 1) spectroscopic redshifts in SDSS for
local and most luminous galaxies; 2) 20-color photometric redshifts derived
from BATC and SDSS; 3) 5-color photometric redshifts in SDSS. We find that the
faint-end slope \alpha steepens slightly from -1.21 at z ~ 0.06 to -1.35 at z ~
0.4, which is the natural consequence of the hierarchical formation of
galaxies. The luminosity function also differs with different environments. The
value of \alpha changes from -1.21 at underdense regions to -1.37 at overdense
regions and the corresponding M* brightens from -22.26 to -22.64. This suggests
that the fraction of faint galaxies is larger in high density regions than in
low density regions.Comment: 7 pages, 9 figures, accepted by Ap
The associations between proprotein convertase subtilisin/kexin type 9 E670G polymorphism and the risk of coronary artery disease and serum lipid levels: a meta-analysis
Convergence and Stability in Collocation Methods of Equation u
This paper is concerned with the convergence, global superconvergence, local superconvergence, and stability of collocation methods for u′(t)=au(t)+bu([t]). The optimal convergence order and superconvergence order are obtained, and the stability regions for the collocation methods are determined. The conditions that the analytic stability region is contained in the numerical stability region are obtained, and some numerical experiments are given
- …