198 research outputs found
Nano-additive manufacturing of multilevel strengthened aluminum matrix composites
Nanostructured materials are being actively developed, while it remains an open question how to rapidly scale them up to bulk engineering materials for broad industrial applications. This study propose an industrial approach to rapidly fabricate high-strength large-size nanostructured metal matrix composites and attempts to investigate and optimize the deposition process and strengthening mechanism. Here, advanced nanocrystalline aluminum matrix composites (nanoAMCs) were assembled for the first time by a novel nano-additive manufacturing method that was guided by numerical simulations (i.e. the in-flight particle model and the porefree deposition model). The present nanoAMC with a mean grain size <50 nm in matrix exhibited hardness eight times higher than the bulk aluminum and shows the highest hardness among all Al–Al2O3 composites reported to date in the literature, which are the outcome of controlling multiscale strengthening mechanisms from tailoring solution atoms, dislocations, grain boundaries, precipitates, and externally introduced reinforcing particles. The present high-throughput strategy and method can be extended to design and architect advanced coatings or bulk materials in a highly efficient (synthesizing a nanostructured bulk with dimensions of 50 × 20 × 4 mm3 in 9 min) and highly flexible (regulating the gradient microstructures in bulk) way, which is conducive to industrial production and application
FISEdit: Accelerating Text-to-image Editing via Cache-enabled Sparse Diffusion Inference
Due to the recent success of diffusion models, text-to-image generation is
becoming increasingly popular and achieves a wide range of applications. Among
them, text-to-image editing, or continuous text-to-image generation, attracts
lots of attention and can potentially improve the quality of generated images.
It's common to see that users may want to slightly edit the generated image by
making minor modifications to their input textual descriptions for several
rounds of diffusion inference. However, such an image editing process suffers
from the low inference efficiency of many existing diffusion models even using
GPU accelerators. To solve this problem, we introduce Fast Image Semantically
Edit (FISEdit), a cached-enabled sparse diffusion model inference engine for
efficient text-to-image editing. The key intuition behind our approach is to
utilize the semantic mapping between the minor modifications on the input text
and the affected regions on the output image. For each text editing step,
FISEdit can automatically identify the affected image regions and utilize the
cached unchanged regions' feature map to accelerate the inference process.
Extensive empirical results show that FISEdit can be and
faster than existing methods on NVIDIA TITAN RTX and A100 GPUs
respectively, and even generates more satisfactory images.Comment: 12 pages, 7 figure
Construction of Nahm data and BPS monopoles with continuous symmetries
We study solutions to Nahm's equations with continuous symmetries and, under
certain (mild) hypotheses, we classify the corresponding Ans\"atze. Using our
classification, we construct novel Nahm data, and prescribe methods for
generating further solutions. Finally, we use these results to construct new
BPS monopoles with spherical symmetry.Comment: 36 pages, 1 table, 2 figures. Submitted version. Comments are
welcome
Multitask Learning for Citation Purpose Classification
We present our entry into the 2021 3C Shared Task Citation Context
Classification based on Purpose competition. The goal of the competition is to
classify a citation in a scientific article based on its purpose. This task is
important because it could potentially lead to more comprehensive ways of
summarizing the purpose and uses of scientific articles, but it is also
difficult, mainly due to the limited amount of available training data in which
the purposes of each citation have been hand-labeled, along with the
subjectivity of these labels. Our entry in the competition is a multi-task
model that combines multiple modules designed to handle the problem from
different perspectives, including hand-generated linguistic features, TF-IDF
features, and an LSTM-with-attention model. We also provide an ablation study
and feature analysis whose insights could lead to future work.Comment: Second Workshop on Scholarly Document Processin
Spectral-Spatial Hyperspectral Image Classification Using Subspace-Based Support Vector Machines and Adaptive Markov Random Fields
This paper introduces a new supervised classification method for hyperspectral images that combines spectral and spatial information. A support vector machine (SVM) classifier, integrated with a subspace projection method to address the problems of mixed pixels and noise, is first used to model the posterior distributions of the classes based on the spectral information. Then, the spatial information of the image pixels is modeled using an adaptive Markov random field (MRF) method. Finally, the maximum posterior probability classification is computed via the simulated annealing (SA) optimization algorithm. The combination of subspace-based SVMs and adaptive MRFs is the main contribution of this paper. The resulting methods, called SVMsub-eMRF and SVMsub-aMRF, were experimentally validated using two typical real hyperspectral data sets. The obtained results indicate that the proposed methods demonstrate superior performance compared with other classical hyperspectral image classification methods.Ritrýnt tímaritPeer Reviewe
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