Filters








12,445 Hits in 1.1 sec

Some sharp inequalities for the Toader-Qi mean [article]

Zhen-Hang Yang
2015 arXiv   pre-print
From these a nice chain of inequalities involving Gauss compound mean, Toader mean and Toader-Qi mean is presented.  ...  The Toader-Qi mean of positive numbers a and b defined by TQ( a,b) =2/π∫_0^π /2a^cos ^2θb^sin ^2θdθ is related to the modified Bessel function of the first kind.  ...  and identric (exponential) means, we call the mean M x,0 (a, b) defined by (1.3) Toader-Qi mean and denote by T Q (a, b).  ... 
arXiv:1507.05430v1 fatcat:izt3ib46lzh2rmbaikviqvtpfi

Low-loss Airy surface plasmon polaritons

Qi Zhang Qi Zhang, Chaohua Tan Chaohua Tan, Chao Hang Chao Hang, Guoxiang Huang Guoxiang Huang
2015 Chinese Optics Letters (COL)  
We propose a scheme to obtain a low-loss propagation of Airy surface plasmon polaritons (SPPs) along the interface between a dielectric and a negative-index metamaterial (NIMM). We show that, by using the transverse-magnetic mode and the related destructive interference effect between electric and magnetic absorption responses, the propagation loss of the Airy SPPs can be largely suppressed when the optical frequency is close to the lossless point of the NIMM. As a result, the Airy SPPs
more » ... in our scheme can propagate more than 6-time long distance than that in conventional dielectric-metal interfaces.
doi:10.3788/col201513.082401 fatcat:f3kzxtlgyfhptph6ltn4ot6mfu

Evaluating Document Coherence Modelling [article]

Aili Shen, Meladel Mistica, Bahar Salehi, Hang Li, Timothy Baldwin, Jianzhong Qi
2021 arXiv   pre-print
While pretrained language models ("LM") have driven impressive gains over morpho-syntactic and semantic tasks, their ability to model discourse and pragmatic phenomena is less clear. As a step towards a better understanding of their discourse modelling capabilities, we propose a sentence intrusion detection task. We examine the performance of a broad range of pretrained LMs on this detection task for English. Lacking a dataset for the task, we introduce INSteD, a novel intruder sentence
more » ... n dataset, containing 170,000+ documents constructed from English Wikipedia and CNN news articles. Our experiments show that pretrained LMs perform impressively in in-domain evaluation, but experience a substantial drop in the cross-domain setting, indicating limited generalisation capacity. Further results over a novel linguistic probe dataset show that there is substantial room for improvement, especially in the cross-domain setting.
arXiv:2103.10133v1 fatcat:g7drpzbzmrhd7jrwxd7nygme44

Benchmarking Adversarial Robustness [article]

Yinpeng Dong, Qi-An Fu, Xiao Yang, Tianyu Pang, Hang Su, Zihao Xiao, Jun Zhu
2019 arXiv   pre-print
In International Conference on Learning Representations (ICLR), 2019. 3 [11] Shuyu Cheng, Yinpeng Dong, Tianyu Pang, Hang Su, and Jun Zhu.  ...  Computer Vision and Pattern Recognition (CVPR), 2019. 4, 5, 13 [64] ings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2019. 3, 5, 12 [65] Weilin Xu, David Evans, and Yanjun Qi  ... 
arXiv:1912.11852v1 fatcat:aamzg5ajlnb27brph52rmd4era

Honokiol Inhibits Atrial Metabolic Remodeling in Atrial Fibrillation Through Sirt3 Pathway

Guang Zhong Liu, Wei Xu, Yan Xiang Zang, Qi Lou, Peng Zhou Hang, Qiang Gao, Hang Shi, Qi Yun Liu, Hong Wang, Xin Sun, Cheng Liu, Peng Zhang (+2 others)
2022 Frontiers in Pharmacology  
and Purpose: Atrial metabolic remodeling plays a critical role in the pathogenesis of atrial fibrillation (AF). Sirtuin3 (Sirt3) plays an important role in energy homeostasis. However, the effect of Sirt3 agonist Honokiol (HL) on AF is unclear. Therefore, the aim of this study is to determine the effect of HL on atrial metabolic remodeling in AF and to explore possible mechanisms.Experimental Approach: irt3 and glycogen deposition in left atria of AF patients were examined. Twenty-one rabbits
more » ... re divided into sham, P (pacing for 3 weeks), P + H treatment (honokiol injected with pacing for 3 weeks). The HL-1 cells were subjected to rapid pacing at 5 Hz for 24 h, in the presence or absence of HL and overexpression or siRNA of Sirt3 by transfection. Metabolic factors, circulating metabolites, atrial electrophysiology, ATP level, and glycogens deposition were detected. Acetylated protein and activity of its enzymes were detected.Key Results: Sirt3 was significantly down-regulated in AF patients and rabbit/HL-1cell model, resulting in the abnormal expression of its downstream metabolic key factors, which were significantly restored by HL. Meanwhile, AF induced an increase of the acetylation level in long-chain acyl-CoA dehydrogenase (LCAD), AceCS2 and GDH, following decreasing of activity of it enzymes, resulting in abnormal alterations of metabolites and reducing of ATP, which was inhibited by HL. The Sirt3 could regulate acetylated modification of key metabolic enzymes, and the increase of Sirt3 rescued AF induced atrial metabolic remodeling.Conclusion and Implications: HL inhibited atrial metabolic remodeling in AF via the Sirt3 pathway. The present study may provide a novel therapeutical strategy for AF.
doi:10.3389/fphar.2022.813272 pmid:35370645 pmcid:PMC8970047 fatcat:5w5iyt5gsjfbdfsex62psubpq4

A Sharp Lower Bound for Toader-Qi Mean with Applications

Zhen-Hang Yang, Yu-Ming Chu
2016 Journal of Function Spaces  
prove that the inequalityTQ(a,b)>Lp(a,b)holds for alla,b>0witha≠bif and only ifp≤3/2, whereTQ(a,b)=2/π∫0π/2acos2θbsin2θdθ,Lp(a,b)=[(bp-ap)/(p(b-a))]1/p (p≠0), andL0(a,b)=abare, respectively, the Toader-Qi  ...  Recently, the Toader-Qi and 𝑝-order logarithmic means have been the subject of intensive research.  ...  In particular, many remarkable inequalities for the Toader-Qi and 𝑝-order logarithmic means can be found in the literature [2] [3] [4] [5] [6] [7] .  ... 
doi:10.1155/2016/4165601 fatcat:f2tfkvbddnbxbcv2utthc7ohea

RIDI: Robust IMU Double Integration [article]

Hang Yan, Qi Shan, Yasutaka Furukawa
2017 arXiv   pre-print
This paper proposes a novel data-driven approach for inertial navigation, which learns to estimate trajectories of natural human motions just from an inertial measurement unit (IMU) in every smartphone. The key observation is that human motions are repetitive and consist of a few major modes (e.g., standing, walking, or turning). Our algorithm regresses a velocity vector from the history of linear accelerations and angular velocities, then corrects low-frequency bias in the linear
more » ... which are integrated twice to estimate positions. We have acquired training data with ground-truth motions across multiple human subjects and multiple phone placements (e.g., in a bag or a hand). The qualitatively and quantitatively evaluations have demonstrated that our algorithm has surprisingly shown comparable results to full Visual Inertial navigation. To our knowledge, this paper is the first to integrate sophisticated machine learning techniques with inertial navigation, potentially opening up a new line of research in the domain of data-driven inertial navigation. We will publicly share our code and data to facilitate further research.
arXiv:1712.09004v2 fatcat:phoowayjobgwznwrrbdnmsuk6y

Finite-Time H2/H∞ Control Design for Stochastic Poisson Systems with Applications to Clothing Hanging Device

Yan Qi, Shiyu Zhong, Zhiguo Yan
2020 Complexity  
2, let J * 1 < ξ, the following inequality is derived: Ne − αT b 1 − ξ − 1 I > 0, (82) where 0 < b 1 < b 2 , T > 0, α ≥ 0, Examples In this section, system (8) can be used to simulate a clothing hanging  ... 
doi:10.1155/2020/2463495 fatcat:kqooodrounb3xcgs5xvsyshmyu

Federated Multi-Target Domain Adaptation [article]

Chun-Han Yao, Boqing Gong, Yin Cui, Hang Qi, Yukun Zhu, Ming-Hsuan Yang
2021 arXiv   pre-print
Federated learning methods enable us to train machine learning models on distributed user data while preserving its privacy. However, it is not always feasible to obtain high-quality supervisory signals from users, especially for vision tasks. Unlike typical federated settings with labeled client data, we consider a more practical scenario where the distributed client data is unlabeled, and a centralized labeled dataset is available on the server. We further take the server-client and
more » ... nt domain shifts into account and pose a domain adaptation problem with one source (centralized server data) and multiple targets (distributed client data). Within this new Federated Multi-Target Domain Adaptation (FMTDA) task, we analyze the model performance of exiting domain adaptation methods and propose an effective DualAdapt method to address the new challenges. Extensive experimental results on image classification and semantic segmentation tasks demonstrate that our method achieves high accuracy, incurs minimal communication cost, and requires low computational resources on client devices.
arXiv:2108.07792v1 fatcat:2jc2w2xn2jcpbms56j73jmdavq

Adsorption characteristics of ammonium nitrogen in a bioretention system

Ying Mei, Jun-Ya Xu, Pei-Qi Jia, Xiao-Han Zhu, Yu-Qi Liu, Jian-Qi Zhang, Hang Zhou, Ya-Jun Xiang, Ying Chang, Jun-Jiang Bao
2021 Thermal Science  
Ammonia nitrogen is one of the important pollutants in urban rainfall. Though iron ions and aluminum ions as a filler for plant retention system have a good effect on the removal of ammonia nitrogen, their adsorption characteristics was rarely studied. This paper uses different media (sand, iron powder, aluminum powder) with different pH values and ionic strengths in the Bioretention system to study the adsorption mechanism of ammonia nitrogen in an artificial rainwater. The result shows that
more » ... ngmuir isothermal adsorption model is more in line with the ammonia nitrogen adsorption process, and the sand has the best adsorption capacity among three samples. Effect of pH values on adsorption kinetics is also studied.
doi:10.2298/tsci200502116m fatcat:gwefpotisbhehfyqpsb7bcfyca

Isothermal adsorption experiment of nitrate nitrogen in bioretention media

Ying Mei, Jun-Ya Xu, Pei-Qi Jia, Xiao-Han Zhu, Yu-Qi Liu, Jian-Qi Zhang, Hang Zhou, Ya-Jun Xiang, Ying Chang, Jun-Jiang Bao
2021 Thermal Science  
Bioretentions can remarkably improve the rainwater quality. Though iron and aluminum as fillers in bioretentions can remove nitrate nitrogen, its adsorption mechanism is not clear yet and was rarely studied. This paper takes sand, iron powder and aluminum powder as the research objects to study the adsorption characteristics of nitrate nitrogen in the bioretention with different pH values and different ionic strength. The results show that aluminum powder has the highest the adsorption
more » ... Langmuir adsorption isotherm equation and the quasi-secondary kinetic model are adopted to analyze the experimental data.
doi:10.2298/tsci200502115m fatcat:cxvb37fcwnek3c5wqaxnmaz7he

Qinanmer, a new compound from Chinese agarwood 'Qi-Nan' originating from Aquilaria sinensis

Hang Shao, Fan-Dong Kong, Hao Wang, Wen-Li Mei, Hao-Fu Dai
2017 Figshare  
new compound comprising 2-(2-phenylethyl)chromone and sesquiterpene moieties, together with two known 2-(2-phenylethyl)chromone derivatives (2–3), was isolated from the high-quality Chinese agarwood "Qi-Nan  ... 
doi:10.6084/m9.figshare.4509074 fatcat:wcq52aaaqfe2vhh4bs7s5axtxy

Cross-domain Detection via Graph-induced Prototype Alignment [article]

Minghao Xu, Hang Wang, Bingbing Ni, Qi Tian, Wenjun Zhang
2020 arXiv   pre-print
Applying the knowledge of an object detector trained on a specific domain directly onto a new domain is risky, as the gap between two domains can severely degrade model's performance. Furthermore, since different instances commonly embody distinct modal information in object detection scenario, the feature alignment of source and target domain is hard to be realized. To mitigate these problems, we propose a Graph-induced Prototype Alignment (GPA) framework to seek for category-level domain
more » ... ment via elaborate prototype representations. In the nutshell, more precise instance-level features are obtained through graph-based information propagation among region proposals, and, on such basis, the prototype representation of each class is derived for category-level domain alignment. In addition, in order to alleviate the negative effect of class-imbalance on domain adaptation, we design a Class-reweighted Contrastive Loss to harmonize the adaptation training process. Combining with Faster R-CNN, the proposed framework conducts feature alignment in a two-stage manner. Comprehensive results on various cross-domain detection tasks demonstrate that our approach outperforms existing methods with a remarkable margin. Our code is available at https://github.com/ChrisAllenMing/GPA-detection.
arXiv:2003.12849v1 fatcat:ha3iewm3ovbn7g5s4cpydoavee

Lignans and phenylpropanoids from the liquid juice of phyllostachys edulis

De-Tao Wang, Ying-Ying Xue, Ying-Fang Zhang, Hang Xun, Qi-Rong Guo, Feng Tang, Jia Sun, Fei-Fei Qi
2019 Figshare  
Seven lignans and eight phenylpropanoids, including one new lignan, 7S,8R,8'R-5,5′-dimethoxyariciresinol-4-O-β-D-glucopyranoside (1), were isolated from the liquid juice of Phyllostachys edulis. Their structures were established by extensive spectroscopic analyses. The absolute configuration of the new compound was determined by comparing its experimental electronic circular dichroism (ECD) spectra with calculated ECD spectra. All compounds were evaluated for their anti-inflammatory activity
more » ... xanthine oxidase inhibitor activity, and the results showed that compound 9 exhibited a moderate activity in these two bioassays. In addition, all the compounds can be detected in health panda faeces by LC-MS.
doi:10.6084/m9.figshare.10328531.v1 fatcat:pq5pausbofdzxipdt6rbkhocoi

Sharp bounds for Toader-Qi mean in terms of logarithmic and identric means

Zhen-Hang Yang, Yuming Chu, Ying-Qing Song
2016 Mathematical Inequalities & Applications  
proposed by Yang in [39], where L(a,b) = (b − a)/(log b − log a) , I(a,b) = (b b /a a ) 1/(b−a) /e and T Q(a,b) = 2 π π/2 0 a cos 2 θ b sin 2 θ dθ are respectively the logarithmic, identric and Toader-Qi  ...  SHARP BOUNDS FOR TOADER-QI MEAN IN TERMS OF LOGARITHMIC AND IDENTRIC MEANS ZHEN-HANG YANG, YU-MING CHU AND YING-QING SONG Abstract.  ...  Keywords and phrases: Toader-Qi mean, logarithmic mean, identric mean, modified Bessel function. R E F E R E N C E S [1] M. ABRAMOWITZ AND I. A.  ... 
doi:10.7153/mia-19-52 fatcat:edrzwm627veohoazf3cswjq6hu
« Previous Showing results 1 — 15 out of 12,445 results