7,467 research outputs found
The Photometric Investigation of V921 Her using the Lunar-based Ultraviolet Telescope of Chang'e-3 mission
The light curve of V921 Her in ultraviolet band observed by the Lunar-based
Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our
solutions conclude that V921 Her is an early type marginal contact binary
system with an additional close-in component. The binary system is under poor
thermal contact with a temperature difference of nearly between the two
components. The close-in component contributes about of the total
luminosity in the triple system. Combining the radial velocity study together
with our photometric solutions, the mass of the primary star and secondary one
are calculated to be , . The evolutionary scenario of V921 Her is discussed.
All times of light minimum of V921 Her available in the bibliography are taken
into account and the curve is analyzed for the first time. The most
probable fitting results are discussed in the paper, which also confirm the
existence of a third component ( year) around the binary system. The
period of V921 Her is also undergoing a continuously rapid increase at a rate
of , which may due to mass
transfer from the less massive component to the more massive one
From Text to Mask: Localizing Entities Using the Attention of Text-to-Image Diffusion Models
Diffusion models have revolted the field of text-to-image generation
recently. The unique way of fusing text and image information contributes to
their remarkable capability of generating highly text-related images. From
another perspective, these generative models imply clues about the precise
correlation between words and pixels. In this work, a simple but effective
method is proposed to utilize the attention mechanism in the denoising network
of text-to-image diffusion models. Without re-training nor inference-time
optimization, the semantic grounding of phrases can be attained directly. We
evaluate our method on Pascal VOC 2012 and Microsoft COCO 2014 under
weakly-supervised semantic segmentation setting and our method achieves
superior performance to prior methods. In addition, the acquired word-pixel
correlation is found to be generalizable for the learned text embedding of
customized generation methods, requiring only a few modifications. To validate
our discovery, we introduce a new practical task called "personalized referring
image segmentation" with a new dataset. Experiments in various situations
demonstrate the advantages of our method compared to strong baselines on this
task. In summary, our work reveals a novel way to extract the rich multi-modal
knowledge hidden in diffusion models for segmentation
N-(2-Amino-4,6-dihydroxypyrimidin-5-yl)acetamide dihydrate
The title compound, C6H8N4O3·2H2O, which crystallized as a dihydrate, has two almost planar segments viz. the pyrimidine ring and the C—N—C(=O)—C group [maxmum deviations of 0.020 (2) and 0.014 (2) Å, respectively], with a dihedral angle of 87.45°. In the crystal, the components are linked by O—H⋯O and N—H⋯O hydrogen bonds
Demonstration of efficient scheme for generation of "Event Ready" entangled photon pairs from single photon source
We present a feasible and efficient scheme, and its proof-of-principle
demonstration, of creating entangled photon pairs in an event-ready way using
only simple linear optical elements and single photons. The quality of
entangled photon pair produced in our experiment is confirmed by a strict
violation of Bell's inequality. This scheme and the associated experimental
techniques present an important step toward linear optics quantum computation.Comment: 4 pages, 4 figure
Development of a time-to-digital converter ASIC for the upgrade of the ATLAS Monitored Drift Tube detector
The upgrade of the ATLAS muon spectrometer for high-luminosity LHC requires
new trigger and readout electronics for the various elements of the detector.
We present the design of a time-to-digital converter (TDC) ASIC prototype for
the ATLAS Monitored Drift Tube (MDT) detector. The chip was fabricated in a
GlobalFoundries 130 nm CMOS technology. Studies indicate that its timing and
power consumption characteristics meet the design specifications, with a timing
bin variation of 40 ps for all 48 channels with a power consumption of about
6.5 mW per channel.Comment: 9 pages, 12 figure
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