7,014 research outputs found
Sintering of Fine Oxide Powders: II, Sintering Mechanisms
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65619/1/j.1151-2916.1997.tb02879.x.pd
Reactive Cerium(IV) Oxide Powders by the Homogeneous Precipitation Method
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66445/1/j.1151-2916.1993.tb03942.x.pd
On Steinerberger Curvature and Graph Distance Matrices
Steinerberger proposed a notion of curvature on graphs (J. Graph Theory,
2023). We show that nonnegative curvature is almost preserved under three graph
operations. We characterize the distance matrix and its null space after adding
an edge between two graphs. Let be a graph distance matrix and
be the all-one vector. We provide a way to construct graphs so that the linear
system does not have a solution. Let be the Perron
eigenvector of We provide a lower bound to
when the graph is a tree.Comment: 3 figure
Always Clear Days: Degradation Type and Severity Aware All-In-One Adverse Weather Removal
All-in-one adverse weather removal is an emerging topic on image restoration,
which aims to restore multiple weather degradation in an unified model, and the
challenging are twofold. First, discovering and handling the property of
multi-domain in target distribution formed by multiple weather conditions.
Second, design efficient and effective operations for different degradation
types. To address this problem, most prior works focus on the multi-domain
caused by weather type. Inspired by inter\&intra-domain adaptation literature,
we observed that not only weather type but also weather severity introduce
multi-domain within each weather type domain, which is ignored by previous
methods, and further limit their performance. To this end, we proposed a
degradation type and severity aware model, called \textbf{UtilityIR}, for blind
all-in-one bad weather image restoration. To extract weather information from
single image, we proposed a novel Marginal Quality Ranking Loss (MQRL) and
utilized Contrastive Loss (CL) to guide weather severity and type extraction,
and leverage a bag of novel techniques such as Multi-Head Cross Attention
(MHCA) and Local-Global Adaptive Instance Normalization (LG-AdaIN) to
efficiently restore spatial varying weather degradation. The proposed method
can significantly outperform the SOTA methods subjectively and objectively on
different weather restoration tasks with a large margin, and enjoy less model
parameters. Proposed method even can restore \textbf{unseen} domain combined
multiple degradation images, and modulating restoration level. Implementation
code will be available at
{https://github.com/fordevoted/UtilityIR}{\textit{this repository}}Comment: 12 pages, 12 figure
Partition Function of Chiral Boson on 2-Torus from Floreanini-Jackiw Lagrangian
We revisit the problem of quantizing a chiral boson on a torus. The
conventional approach is to extract the partition function of a chiral boson
from the path integral of a non-chiral boson. Instead we compute it directly
from the chiral boson Lagrangian of Floreanini and Jackiw modified by
topological terms involving auxiliary fields. A careful analysis of the
gauge-fixing condition for the extra gauge symmetry reproduces the correct
results for the free chiral boson, and has the advantage of being applicable to
a wider class of interacting chiral boson theories.Comment: 31 pages, minor modificatio
Two-Step Sintering of Ceramics with Constant Grain-Size, I. Y\u3csub\u3e2\u3c/sub\u3eO\u3csub\u3e3\u3c/sub\u3e
Isothermal and constant-grain-size sintering have been carried out to full density in Y2O3 with and without dopants, at as low as 40% of the homologous temperature. The normalized densification rate follows Herring’s scaling law with a universal geometric factor that depends only on density. The frozen grain structure, however, prevents pore relocation commonly assumed in the conventional sintering models, which fail to describe our data. Suppression of grain growth but not densification is consistent with a grain boundary network pinned by triple-point junctions, which have a higher activation energy for migration than grain boundaries. Long transients in sintering and grain growth have provided further evidence of relaxation and threshold processes at the grain boundary/triple point
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