8,945 research outputs found
-degeneration and -lemma
For a double complex , we show that if it satisfies the
-lemma and the spectral sequence induced by does
not degenerate at , then it degenerates at . We apply this result to
prove the degeneration at of a Hodge-de Rham spectral sequence on compact
bi-generalized Hermitian manifolds that satisfy a version of -lemma
Attractive Factors of Environment-Friendly Daily Necessities
Going green is increasingly important to the market. The present research indicates that functional and emotional factors can achieve the best-perceived effects when choosing an environment-friendly product. Therefore, this study aims to gather these attractive factors from high-involvement groups by using Miryoku engineering. First, we capture the factors through the Evaluation Grid Method and use Quantification Theory Type I for quantitative analysis. Then, generalize four feelings about environment-friendly products, namely “Assured,” “Responsible,” “Safe,” and “Comfortable.” We also define a linear dimension with short-, normal-, and far-sight for locating attractive factors and feelings. The result shows that high-involvement groups are more concerned about the long-term impacts of “Responsible” feelings, while low-involvement groups focus more on the obvious benefits of “Responsible” and “Safe” feelings. Moreover, the emphasis on natural ingredients is necessary for achieving “Assured” and “Comfortable” feelings for both the high- and low-involvement groups
Learning to Predict the Cosmological Structure Formation
Matter evolved under influence of gravity from minuscule density
fluctuations. Non-perturbative structure formed hierarchically over all scales,
and developed non-Gaussian features in the Universe, known as the Cosmic Web.
To fully understand the structure formation of the Universe is one of the holy
grails of modern astrophysics. Astrophysicists survey large volumes of the
Universe and employ a large ensemble of computer simulations to compare with
the observed data in order to extract the full information of our own Universe.
However, to evolve trillions of galaxies over billions of years even with the
simplest physics is a daunting task. We build a deep neural network, the Deep
Density Displacement Model (hereafter DM), to predict the non-linear
structure formation of the Universe from simple linear perturbation theory. Our
extensive analysis, demonstrates that DM outperforms the second order
perturbation theory (hereafter 2LPT), the commonly used fast approximate
simulation method, in point-wise comparison, 2-point correlation, and 3-point
correlation. We also show that DM is able to accurately extrapolate far
beyond its training data, and predict structure formation for significantly
different cosmological parameters. Our study proves, for the first time, that
deep learning is a practical and accurate alternative to approximate
simulations of the gravitational structure formation of the Universe.Comment: 8 pages, 5 figures, 1 tabl
- …