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476 results on '"Gao, Hongfei"'

1. Orientifold Calabi-Yau Threefolds: Divisor Exchanges and Multi-Reflections

Author

Cao, Xu, Gao, Hongfei, and Gao, Xin

Subjects
High Energy Physics - Theory
Abstract

Using the Kreuzer-Skarke database of 4-dimensional reflexive polytopes, we systematically constructed a new database of orientifold Calabi-Yau threefolds with $h^{1,1}(X) \leq 12$. Our approach involved non-trivial $\mathbb{Z}_2$ involutions, incorporating both divisor exchanges and multi-divisor reflections acting on the Calabi-Yau threefolds. Each proper involution results in an orientifold Calabi-Yau threefolds and we constructed 320,386,067 such examples. We developed a novel algorithm that significantly reduces the complexity of determining all the fixed loci under the involutions, and clarifies the types of O-planes. Our results show that under proper involutions, the majority of cases end up with O3/O7-plane systems, and most of these further admit a naive Type IIB string vacua. Additionally, a new type of free action was determined. We also computed the smoothness and the splitting of Hodge numbers in the $\mathbb{Z}_2$-orbifold limit for these orientifold Calabi-Yau threefolds., Comment: 55 pages, 2 figures

Published
2024

3. Nearly critical superfluid: effective field theory and holography

Author

Bu, Yanyan, Gao, Hongfei, Gao, Xin, and Li, Zhiwei

Subjects
High Energy Physics - Theory
Abstract

We study a nearly critical superfluid system from two complementary approaches. Within the first approach, we formulate a Schwinger-Keldysh effective field theory (EFT) for the system when it is located slightly above the critical temperature. . The set of symmetries, particularly the dynamical Kubo-Martin-Schwinger (KMS) symmetry and chemical shift symmetry, strictly constrains the form of EFT action. Within the second approach, using the holographic Schwinger-Keldysh technique, we derive the effective action for a ``microscopic'' holographic superfluid, confirming the EFT construction. A systematic inclusion of non-Gaussianity is one highlight of present study., Comment: 35 pages

Published
2024

7. Exploring the Innovative Implementation Path of Ideological and Political Education of College Football Curriculum under the background of 'Internet plus'

Author

Meng, Shasha, Gao, Hongfei, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Zhu, Shoutong, editor, Baldini, Andrea L., editor, Hong, Yongming, editor, Xu, Zhihua, editor, and Syed Mohammed, Sharifah Faizah, editor

Published
2024
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18. Gaze Behavior Patterns for Early Drowsiness Detection

Author

Gao, Hongfei, Hu, Ruimin, Huang, Zijun, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Iliadis, Lazaros, editor, Papaleonidas, Antonios, editor, Angelov, Plamen, editor, and Jayne, Chrisina, editor

Published
2023
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31. High-fat feeding reprograms maternal energy metabolism and induces long-term postpartum obesity in mice

Author

Qiao, Liping, Chu, Kayee, Wattez, Jean-Sebastien, Lee, Samuel, Gao, Hongfei, Feng, Gen-Sheng, Hay, William W, and Shao, Jianhua

Subjects
Reproductive Medicine, Biomedical and Clinical Sciences, Prevention, Cardiovascular, Obesity, Heart Disease, Nutrition, 2.1 Biological and endogenous factors, Aetiology, Stroke, Cancer, Oral and gastrointestinal, Metabolic and endocrine, Affordable and Clean Energy, Animals, Diet, High-Fat, Disease Models, Animal, Energy Metabolism, Female, Gestational Weight Gain, Male, Mice, Mice, Inbred C57BL, Postpartum Period, Weight Gain, Medical and Health Sciences, Education, Endocrinology & Metabolism, Biomedical and clinical sciences, Health sciences
Abstract

BackgroundExcessive gestational weight gain (EGWG) closely associates with postpartum obesity. However, the causal role of EGWG in postpartum obesity has not been experimentally verified. The objective of this study was to determine whether and how EGWG causes long-term postpartum obesity.MethodsC57BL/6 mice were fed with high-fat diet during gestation (HFFDG) or control chow, then their body composition and energy metabolism were monitored after delivery.ResultsWe found that HFFDG significantly increased gestational weight gain. After delivery, adiposity of HFFDG-treated mice (Preg-HF) quickly recovered to the levels of controls. However, 3 months after parturition, Preg-HF mice started to gain significantly more body fat even with regular chow. The increase of body fat of Preg-HF mice was progressive with aging and by 9 months after delivery had increased 2-fold above the levels of controls. The expansion of white adipose tissue (WAT) of Preg-HF mice was manifested by hyperplasia in visceral fat and hypertrophy in subcutaneous fat. Preg-HF mice developed low energy expenditure and UCP1 expression in interscapular brown adipose tissue (iBAT) in later life. Although blood estrogen concentrations were similar between Preg-HF and control mice, a significant decrease in estrogen receptor α (ERα) expression and hypermethylation of the ERα promoter was detected in the fat of Preg-HF mice 9 months after delivery. Interestingly, hypermethylation of ERα promoter and low ERα expression were only detected in adipocyte progenitor cells in both iBAT and WAT of Preg-HF mice at the end of gestation.ConclusionsThese results demonstrate that HFFDG causes long-term postpartum obesity independent of early postpartum fat retention. This study also suggests that HFFDG adversely programs long-term postpartum energy metabolism by epigenetically reducing estrogen signaling in both BAT and WAT.

Published
2019

43. Covalent Organic Framework Interlayer Spacings as Perfectly Selective Artificial Proton Channels.

Author

Li, Qi, Gao, Hongfei, Zhao, Yongye, Zhou, Bo, Yu, Lei, Huang, Qingsong, Jiang, Lei, and Gao, Jun

Subjects
*PROTONS, *DENSITY functional theory, *HYDROGEN bonding, *FUNCTIONAL groups
Abstract

Biological proton channels have perfect selectivity in aqueous environment against almost all ions and molecules, a property that differs itself from other biological channels and a feature that remains challenging to realize for bulk artificial materials. The biological perfect selectivity originates from the fact that the channel has almost no free space for ion or water transport but generates a hydrogen bonded wire in the presence of protons to allow the proton hopping. Inspired by this, we used the interlayer spacings of covalent organic framework materials consisting of hydrophilic functional groups as perfectly selective artificial proton channels. The interlayer spacings are so narrow that no atoms or molecules can diffuse through. However, protons exhibit a diffusivity in the same order of magnitude as that in bulk water. Density functional theory calculations show that water molecules and the COF material form hydrogen bonded wires, allowing the proton hopping. We further demonstrate that the proton transport rate can be tuned by adjusting the acidity of the functional groups. [ABSTRACT FROM AUTHOR]

Published
2024
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