4,519 research outputs found
Effects of the initial water curing time on the corrosion behavior of steel bar corrosion in fly ash concrete
AbstractConcrete specimens made of 30% fly ash (FA) replacement ratio and ordinary Portland cement (OPC) were fabricated to study the effects of the initial water curing time on the corrosion behavior of the embedded steel bar. The specimens were cured in water tank for 5days, 7days, 14days and 28days respectively at a normal temperature of 20□, then taken out and stored at an indoor natural environment. At the exposure time of 60days, 120days and 180days, steel bars' corrosion current densities icorr, corrosion potentials Ecorr in FA and OPC concrete specimens and their electrical resistivities ρc were tested. Results indicate that the initial wet curing time has important effects on steel bars' corrosion behaviors in both FA concrete and OPC concrete. With the increase of the initial wet curing time, steel bars' icorr all tend to decrease and Ecorr tend to increase. The longer the initial wet curing time, the higher the protective ability of FA concrete, compared to OPC concrete. Under the normal temperature, the shorter initial wet curing time of 5days and 7days for FA concrete showed worse protective ability than OPC concrete. However, when the initial wet curing time surpasses 14days, FA concrete behaves better than OPC concrete
Cinnamic aldehyde treatment alleviates chronic unexpected stress-induced depressive-like behaviors via targeting cyclooxygenase-2 in mid-aged rats
Ethnopharmacological relevance: COX-2 has been considered as a potent molecular target for prevention and therapy of depression. However, a recent study showed that COX-2 inhibitor does not improve depressive symptoms in persons aged 70 and over. Therefore, whether treatments targeting COX-2 have a clinical efficacy in depression, especially elderly individuals, remains unclear. Cinnamic aldehyde is a major constituent of Cinnamomum cassia, which has exhibited excellent anti-inflammatory activities as a COX-2 inhibitor. To investigate the potential antidepressant effect of cinnamic aldehyde in mid-aged rats
Correlating Gravitational Waves with -boson Mass, FIMP Dark Matter, and Majorana Seesaw Mechanism
We study a minimal extension of the Standard Model by introducing three
right-handed neutrinos and a new scotogenic scalar doublet, in which the mass
splittings between neutral and charged components are responsible for the
-boson mass newly measured by the CDF collaboration. This model can not only
generate non-vanishing Majorana neutrino masses via the interaction of
right-handed neutrinos and scotogenic scalars, but also explain the Universe's
missing matter in the form of FIMP dark matter. We also study the influence of
the mass splitting on the first order electroweak phase transition, and find
that it can further enhance the transition strength and thus induce
gravitational waves during the phase transition, which may be detected in the
forthcoming detectors such as U-DECIGO.Comment: References updated, accepted for publication in Science Bulleti
Proper Matter Collineations of Plane Symmetric Spacetimes
We investigate matter collineations of plane symmetric spacetimes when the
energy-momentum tensor is degenerate. There exists three interesting cases
where the group of matter collineations is finite-dimensional. The matter
collineations in these cases are either four, six or ten in which four are
isometries and the rest are proper.Comment: 10 pages, LaTex, accepted for publication in Modern Physics Letters
Di-μ-cyanido-1:2κ2 C:N,2:3κ2 N:C-hexacyanido-1κ3 C,3κ3 C-tetrakis(1,10-phenanthroline)-1κ2 N,N′;2κ4 N,N′;3κ2 N,N′-1,3-dicobalt(III)-2-iron(II) tetrahydrate
The hydrothermal reaction of CoCl2·6H2O, 1,10-phenanthroline (phen) and K3[Fe(CN)6] in deionized water yielded the title cyanide-bridged trinuclear cluster, [Co2Fe(CN)8(C12H8N2)4]·4H2O or [{CoIII(phen)(CN)4}2{FeII(phen)2}]·4H2O, which contains two CoIII centers and one FeII center linked by cyanide bridges. The combination of coordinative bonds, O—H⋯N and O—H⋯O hydrogen bonds and π–π stacking interactions [centroid–centroid distance = 3.630 (2) Å] results in the stabilization of a supramolecular structure. All uncoordinated water molecules are disordered. Thermogravimetric analysis reveals that the title complex loses the four crystal water molecules at about 333 K, then the anhydrous phase loses no further mass up to about 573 K, above which decomposition occurs
AoM: Detecting Aspect-oriented Information for Multimodal Aspect-Based Sentiment Analysis
Multimodal aspect-based sentiment analysis (MABSA) aims to extract aspects
from text-image pairs and recognize their sentiments. Existing methods make
great efforts to align the whole image to corresponding aspects. However,
different regions of the image may relate to different aspects in the same
sentence, and coarsely establishing image-aspect alignment will introduce noise
to aspect-based sentiment analysis (i.e., visual noise). Besides, the sentiment
of a specific aspect can also be interfered by descriptions of other aspects
(i.e., textual noise). Considering the aforementioned noises, this paper
proposes an Aspect-oriented Method (AoM) to detect aspect-relevant semantic and
sentiment information. Specifically, an aspect-aware attention module is
designed to simultaneously select textual tokens and image blocks that are
semantically related to the aspects. To accurately aggregate sentiment
information, we explicitly introduce sentiment embedding into AoM, and use a
graph convolutional network to model the vision-text and text-text interaction.
Extensive experiments demonstrate the superiority of AoM to existing methods.
The source code is publicly released at https://github.com/SilyRab/AoM.Comment: Findings of ACL 202
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