1,422 research outputs found
A Proposed Technique to Acquire Cavity Pressure Using a Surface Strain Sensor During Injection- Compression Molding
A new technique was proposed and experimentally verified for the cavity pressure acquisition in the injection-compression molding (ICM). The surface strain of the fixed mold half and the cavity pressure were monitored simultaneously during ICM. In the compression stage, a directly proportional relationship between the cavity pressure and mold surface strain was found and determined via the regression analysis. By taking the advantage of this relationship, the cavity pressure profile with high accuracy was indirectly obtained from the nondestructive measurement of the mold surface strain. Moreover, the mold surface strain profile could indicate the part weight or thickness and the critical time when the part surface lost contact with the cavity surface in a large area. The monitoring of the mold surface strain could serve as an interesting alternative to the direct monitoring of the cavity pressure with respect to process and part quality control for ICM
One-shot ultraspectral imaging with reconfigurable metasurfaces
One-shot spectral imaging that can obtain spectral information from thousands
of different points in space at one time has always been difficult to achieve.
Its realization makes it possible to get spatial real-time dynamic spectral
information, which is extremely important for both fundamental scientific
research and various practical applications. In this study, a one-shot
ultraspectral imaging device fitting thousands of micro-spectrometers (6336
pixels) on a chip no larger than 0.5 cm, is proposed and demonstrated.
Exotic light modulation is achieved by using a unique reconfigurable
metasurface supercell with 158400 metasurface units, which enables 6336
micro-spectrometers with dynamic image-adaptive performances to simultaneously
guarantee the density of spectral pixels and the quality of spectral
reconstruction. Additionally, by constructing a new algorithm based on
compressive sensing, the snapshot device can reconstruct ultraspectral imaging
information (/~0.001) covering a broad (300-nm-wide)
visible spectrum with an ultra-high center-wavelength accuracy of 0.04-nm
standard deviation and spectral resolution of 0.8 nm. This scheme of
reconfigurable metasurfaces makes the device can be directly extended to almost
any commercial camera with different spectral bands to seamlessly switch the
information between image and spectral image, and will open up a new space for
the application of spectral analysis combining with image recognition and
intellisense
Embrace Divergence for Richer Insights: A Multi-document Summarization Benchmark and a Case Study on Summarizing Diverse Information from News Articles
Previous research in multi-document news summarization has typically
concentrated on collating information that all sources agree upon. However, to
our knowledge, the summarization of diverse information dispersed across
multiple articles about an event has not been previously investigated. The
latter imposes a different set of challenges for a summarization model. In this
paper, we propose a new task of summarizing diverse information encountered in
multiple news articles encompassing the same event. To facilitate this task, we
outlined a data collection schema for identifying diverse information and
curated a dataset named DiverseSumm. The dataset includes 245 news stories,
with each story comprising 10 news articles and paired with a human-validated
reference. Moreover, we conducted a comprehensive analysis to pinpoint the
position and verbosity biases when utilizing Large Language Model (LLM)-based
metrics for evaluating the coverage and faithfulness of the summaries, as well
as their correlation with human assessments. We applied our findings to study
how LLMs summarize multiple news articles by analyzing which type of diverse
information LLMs are capable of identifying. Our analyses suggest that despite
the extraordinary capabilities of LLMs in single-document summarization, the
proposed task remains a complex challenge for them mainly due to their limited
coverage, with GPT-4 only able to cover less than 40% of the diverse
information on average
Molecular cloning, expression pattern, and putative cis-acting elements of a 4-coumarate:CoA ligase gene in bamboo ( Neosinocalamus affinis )
Background: 4-coumarate:CoA ligase (4CL) plays an important role at the
divergence point from general phenylpropanoid metabolism to several
branch pathways. Although 4CL sin higher plants have been extensively
studied, little has known about the 4CL gene of bamboo. Results: In
current study, a Na4CL gene putative encoding 4-coumarate:CoA ligase
(4CL) and its 5\u2019-flanking region were isolated from bamboo
(Neosinocalamus affinis) by RACE-PCR and genomic DNA walker,
respectively. Na4CL encodes a predicted protein of 557 amino acids,
with conserved motifs of adenylate-forming enzymes. Phylogenetic
analysis showed that Na4CL shared 62~85% identity with other known
plant 4CLs, and cluster closely with some known 4CLs in monocots.
Sequence analysis revealed conserved cis-acting elements (Box A and
AC-II element) present in the Na4CL promoter. Additionally, a Na4CL
RNAi construct was transformed into tobacco. Transgenic tobaccos
displayed significant down-expression of endogenesis 4CL and reduced
lignin contents. Conclusion:These results contribute to the knowledge
of the presence of Na4CL gen and its possible role in phenylpropanoid
metabolism
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