127 research outputs found
Text-based Localization of Moments in a Video Corpus
Prior works on text-based video moment localization focus on temporally
grounding the textual query in an untrimmed video. These works assume that the
relevant video is already known and attempt to localize the moment on that
relevant video only. Different from such works, we relax this assumption and
address the task of localizing moments in a corpus of videos for a given
sentence query. This task poses a unique challenge as the system is required to
perform: (i) retrieval of the relevant video where only a segment of the video
corresponds with the queried sentence, and (ii) temporal localization of moment
in the relevant video based on sentence query. Towards overcoming this
challenge, we propose Hierarchical Moment Alignment Network (HMAN) which learns
an effective joint embedding space for moments and sentences. In addition to
learning subtle differences between intra-video moments, HMAN focuses on
distinguishing inter-video global semantic concepts based on sentence queries.
Qualitative and quantitative results on three benchmark text-based video moment
retrieval datasets - Charades-STA, DiDeMo, and ActivityNet Captions -
demonstrate that our method achieves promising performance on the proposed task
of temporal localization of moments in a corpus of videos
Surfactant Incorporated Nanostructure for Pressure Drop Reduction in Oil and Gas Lines [DIV]
Nano-sized rare earth metal oxide particles are prepared from aqueous reverse micelles. The engineered nanoparticles have large surface area to volume ratios, and uniformly incorporate a surfactant in each particle, so that when applied to the inner surface of a pipeline or sprayed onto a fluid stream in a pipeline, the particles reduce the roughness of the inside surface of pipe being used to transport fluid. The application of a nanolayer of this novel nanoceria mixture causes a significant reduction in pressure drops, friction, and better recovery and yield of fluid flowing through a pipeline
Calcitonin Functions Both as a Hypocalcemic Hormone and Stimulator of Steroid Production and Oocyte Maturation in Ovarian Follicles of Common Carp, Cyprinus carpio
Surfactant Incorporated Nanostructures for Pressure Drop Reduction in Oil and Gas Lines
Nano-sized rare earth metal oxide particles are prepared from aqueous reverse micelles. The engineered nanoparticles have large surface area to volume ratios, and uniformly incorporate a surfactant in each particle, so that when applied to the inner surface of a pipeline or sprayed onto a fluid stream in a pipeline, the particles reduce the roughness of the inside surface of pipe being used to transport fluid. The application of a nanolayer of this novel nanoceria mixture causes a significant reduction in pressure drops, friction, and better recovery and yield of fluid flowing through a pipeline
Development of half metallicity within mixed magnetic phase of CuCoMnSb alloy
Cubic Half-Heusler CuCoMnSb (0 0.1) compounds
have been investigated both experimentally and theoretically for their
magnetic, transport and electronic properties in search of possible half
metallic antiferromagnetism. The systems (Cu,Co)MnSb are of particular interest
as the end member alloys CuMnSb and CoMnSb are semi metallic (SM)
antiferromagnetic (AFM) and half metallic (HM) ferromagnetic (FM),
respectively. Clearly, Co-doping at the Cu-site of CuMnSb introduces changes in
the carrier concentration at the Fermi level that may lead to half-metallic
ground state but there remains a persistent controversy whether the AFM to FM
transition occurs simultaneously. Our experimental results reveal that the AFM
to FM magnetic transition occurs through a percolation mechanism where
Co-substitution gradually suppresses the AFM phase and forces FM polarization
around every dopant cobalt. As a result a mixed magnetic phase is realized
within this composition range while a nearly HM band structure is developed
already at the 10% Co-doping. Absence of T dependence in the resistivity
variation at low T-region serves as an indirect proof of opening up an energy
gap at the Fermi surface in one of the spin channels. This is further
corroborated by the ab-initio electronic structure calculations that suggests a
nearly ferromagnetic half-metallic ground state is stabilized by Sb-p holes
produced upon Co doping
Altered expression and editing of miRNA-100 regulates iTreg differentiation
RNA editing ofmiRNAs, especially in the seed region,
adds another layer to miRNA mediated gene regulation
which can modify its targets, altering cellular signaling
involved in important processes such as differentiation.
In this study, we have explored the role
of miRNA editing in CD4+ T cell differentiation. CD4+
T cells are an integral component of the adaptive immune
system. Na¨ıve CD4+ T cells, on encountering
an antigen, get differentiated either into inflammatory
subtypes like Th1, Th2 or Th17, or into immunosuppressive
subtype Treg, depending on the cytokine
milieu. We found C-to-U editing at fifth position of
mature miR-100, specifically in Treg. The C-to-U editing
of miR-100 is functionally associated with at least
one biologically relevant target change, from MTOR
to SMAD2. Treg cell polarization by TGFβ1 was reduced
by both edited and unedited miR-100 mimics,
but percentage of Treg in PBMCs was only reduced
by edited miR-100 mimics, suggesting a model in
which de-repression of MTOR due to loss of unedited
mir-100, promotes tolerogenic signaling, while gain
of edited miR-100 represses SMAD2, thereby limiting
the Treg. Such delicately counterbalanced systems
are a hallmark of immune plasticity and we propose
that miR-100 editing is a novel mechanism toward
this end
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