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Duality theorem for L-R crossed coproducts

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Applied Mathematics(A Journal of Chinese Universities) 2018年第3期33卷 359-378页

作者： CHEN quan-guo WANG Ding-guo School of Mathematical Sciences Qufu Normal University

In this paper, the notion of L-R crossed coproduct is introduced as a unified approach for smash coproducts, crossed coproducts and L-R smash coproducts of Hopf algebras.A duality theorem for L-R crossed coproduct is ... 详细信息

关键词： Hopf algebra crossed coproduct cleft coextension

Second order conformal multi-symplectic method for the damped Korteweg–de Vries equation

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Chinese Physics B 2019年第5期28卷 20-26页

作者： feng guo Fujian Province University Key Laboratory of Computational Science School of Mathematical Sciences Huaqiao University

A conformal multi-symplectic method has been proposed for the damped Korteweg–de Vries(DKdV) equation, which is based on the conformal multi-symplectic structure. By using the Strang-splitting method and the Preissmann box scheme,we obtain a conformal multi-symplectic scheme for multi-symplectic partial differential equations(PDEs) with added dissipation. Applying it to the DKdV equation, we construct a conformal multi-symplectic algorithm for it, which is of second order accuracy in time. Numerical experiments demonstrate that the proposed method not only preserves the dissipation rate of mass exactly with periodic boundary conditions, but also has excellent long-time numerical behavior.

关键词： conformal multi-symplectic method damped Korteweg–de Vries (KdV) equation dissipation preservation

Inactivated Sendai Virus Suppresses Murine Melanoma Growth by Inducing Host Immune Responses and Down-regulating β-catenin Expression

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Biomedical and Environmental Sciences 2012年第5期25卷 509-516页

作者： ZHANG quan YUAN Wei feng ZHAI guo Qin XUE Zheng feng ZHU Hong Fei XU Xiang Ming College of Veterinary Medicine Yangzhou UniversRyYangzhou 225009JiangsuChina Institute of Animal Science and Veterinary Medicine Chinese Academy of Agricultural SciencesBeijing 100081China Key Laboratory of Animal-used High-tech Biopharmaceutical of Jiangsu Province Taizhou 225300JiangsuChina

Abstract Objective This paper aims to investigate the anti-tumor mechanism of inactivated Sendai virus （Hemagglutinating virus of Japan envelope, HVJ-E） for murine melanoma （B16F10）. Methods The murine dendritic cells （DCs） were treated with HVJ-E, and then the cytokines secreted from DCs and costimulation-related molecules on DCs were measured. Meanwhile, the expression of 13-catenin in HVJ-E treated murine melanoma cells was detected. In addition, HVJ-E was intratumorally injected into the melanoma on C57BL/6 mice, and the immune cells, CTL response and tumor volume were analyzed. Results HVJ-E injected into B16F10 melanoma obviously inhibited the growth of the tumor and prolonged the survival time of the tumor-bearing mice. Profiles of cytokines secreted by dendritic cells （DCs） after HVJ-E stimulation showed that the number of cytokines released was significantly higher than that elicited by PBS （P〈O.05）. The co-stimulation-related molecules on DCs were comparable to those stimulated by LPS. Immunohistochemical examinations demonstrated the repression of 13-catenin in B16F10 melanoma cells after HVJ-E treatment. Meanwhile, real-time reverse transcription PCR revealed that HVJ-E induced a remarkable infiltration of CDllc positive cells, chemokine ligand 10 （CXCL10） molecules, interleukin-2 （IL-2） molecule, CD4^＋ and CD8^＋ T cells into HVJ-E injected tumors. Furthermore, the mRNA expression level of 13-catenin in the HVJ-E injected tumors was also down-regulated. In addition, B16F10-specific CTLs were induced significantly after HVJ-E was injected into the tumor-bearing mice. Conclusion This is the first report to show the effective inhibition of melanoma tumors by HVJ-E alone and the mechanism through which it induces antitumor immune responses and regulates important signal pathways for melanoma invasion. Therefore, HVJ-E shows its prospect as a novel therapeutic for melanoma therapy.

关键词： HVJ-E Dendritic cell Melanoma β-catenin

EXPANSIONS OF STEP-TRANSITION OPERATORS OF MULTI-STEP METHODS AND ORDER BARRIERS FOR DAHLQUIST PAIRS

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Journal of Computational Mathematics 2006年第1期24卷 45-58页

作者： quan-dong feng Yi-fa Tang LSEC ICMSEC Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Graduate School of the Chinese Academy of Sciences Beijing 100080 China

Using least parameters, we expand the step-transition operator of any linear multi-step method （LMSM） up to O（τ^s＋5） with order s = 1 and rewrite the expansion of the steptransition operator for s = 2 （obtained by the second author in a former paper）. We prove that in the conjugate relation G3^λτ o G1^τ =G2^τ o G3^λτ with G1 being an LMSM,（1） theorder of G2 can not be higher than that of G1; （2） if G3 is also an LMSM and G2 is a symplectic B-series, then the orders of G1, G2 and G3 must be 2, 2 and 1 respectively.

关键词： Linear Multi-Step Method Step-Transition Operator B-series Dahlquist(Conjugate) pair Symplecticity

Amentoflavone protects hippocampal neurons: anti-inflammatory, antioxidative, and antiapoptotic effects

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Neural Regeneration Research 2015年第7期10卷 1125-1133页

作者： Zhen Zhang Tao Sun Jian-guo Niu Zhen-quan He Yang Liu feng Wang Ningxia Key Laboratory of Cerebrocranial Disease Incubation Base of National Key Laboratory Ningxia Medical University Department of Neurosurgery General Hospital of Ningxia Medical University

Amentoflavone is a natural biflavone compound with many biological properties, including anti-inflammatory, antioxidative, and neuroprotective effects. We presumed that amentoflavone exerts a neuroprotective effect in epilepsy models. Prior to model establishment, mice were intragastrically administered 25 mg/kg amentoflavone for 3 consecutive days. Amentoflavone effectively prevented pilocarpine-induced epilepsy in a mouse kindling model, suppressed nuclear factor-κB activation and expression, inhibited excessive discharge of hippocampal neurons resulting in a reduction in epileptic seizures, shortened attack time, and diminished loss and apoptosis of hippocampal neurons. Results suggested that amentoflavone protected hippocampal neurons in epilepsy mice via anti-inflammation, antioxidation, and antiapoptosis, and then effectively prevented the occurrence of seizures.

关键词： nerve regeneration brain injury epilepsy neuroprotection apoptosis nuclear factor-κB brain inflammation interleukin-6 interleukin-1 beta inducible nitric oxide synthase nitric oxide prostaglandin E2 NSFC grant neural regeneration

SIES:A Novel Implementation of Spiking Convolutional Neural Network Inference Engine on Field-Programmable Gate Array

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Journal of Computer Science & Technology 2020年第2期35卷 475-489页

作者： Shu-quan Wang Lei Wang Yu Deng Zhi-Jie Yang Sha-Sha guo Zi-Yang Kang Yu-feng guo Wei-Xia Xu College of Computer Science and Technology National University of Defense TechnologyChangsha 430041China

Neuromorphic computing is considered to be the future of machine learning,and it provides a new way of cognitive *** by the excellent performance of spiking neural networks(SNNs)on the fields of low-power consumption and parallel computing,many groups tried to simulate the SNN with the hardware ***,the efficiency of training SNNs with neuromorphic algorithms is not ideal *** this,Michael et *** a method which can solve the problem with the help of DNN(deep neural network).With this method,we can easily convert a well-trained DNN into an SCNN(spiking convolutional neural network).So far,there is a little of work focusing on the hardware accelerating of *** motivation of this paper is to design an SNN processor to accelerate SNN inference for SNNs obtained by this DNN-to-SNN *** propose SIES(Spiking Neural Network Inference Engine for SCNN Accelerating).It uses a systolic array to accomplish the task of membrane potential increments *** integrates an optional hardware module of max-pooling to reduce additional data moving between the host and the *** also design a hardware data setup mechanism for the convolutional layer on the SIES with which we can minimize the time of input spikes *** implement the SIES on FPGA *** number of neurons it supports is up to 4000 while the synapses are *** SIES can run with the working frequency of 200 MHz,and its peak performance is 1.5625 TOPS.

关键词： spiking neural network(SNN) field-programmable gate array(FPGA) neuromorphic systolic array spiking convolutional neural network(SCNN) integrete and fire(I&F)model hardware accelerator

High-entropy intermetallics:from alloy design to structural and functional properties

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Rare Metals 2022年第6期41卷 1989-2001页

作者： Hang Wang quan-feng He Yong Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering.City University of Hong Kong Hong Kong 999077China Department of Advanced Design and System Engineering.City University of Hong Kong Hong Kong 999077China

Conventional intermetallics are strong but ***,multi-principal element intermetallics,also termed as high-entropy intermetallics(HEIs)in the recent high-entropy alloy literature,are strong but malleable,some of which even show appreciable ductility and fracture toughness at room *** this article,we provide a focused review on the recent researches on HEIs,from the fundamentals,such as the concept of HEIs,the formation rules to the structural and functional properties of *** results hitherto reported clearly show that the HEIs with distinct properties could be a promising material for future structural and functional applications.

关键词： Internetallics High-entropy alloys Phase formation Mechanical properties Functional properies

Impedance Studies of Spinel LiMn_2O_4 Electrode/electrolyte Interfaces

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Chemical Research in Chinese Universities 2008年第4期24卷 511-515页

作者： ZHUANG quan-chao FAN Xiao-yong XU Jin-mei WEI guo-zhen DONG quan-feng SUN Shi-gang School of Materials Science and Engineering China University of Mining ＆ Technology Xuzhou 221116 P. R. China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen 361005 P. R. China

The formation process of solid electrolyte interphase（SEI） film on spinel LiMn2O4 electrode surface was studied by electrochemical impedance spectroscopy（EIS） during the initial storage in 1 mol/L LiPF6-EC：DMC：DEC electrolyte and in the subsequent first charge-discharge cycle. It has been demonstrated that the SEI film thickness increased with the increase of storage time and spontaneous reactions occurring between spinel LiMn2O4 electrode and electrolyte can be prevented by the SEI film. In the first charge-discharge cycle succeeding the storage, the electrolyte oxidation coupled with Li-ion insertion is evidenced as the main origin to increase the resistance of SEI film. The results also confirm that the variations of the charge transfer resistance（Rot） with the electrode potential（E） can be well described using a classical equation.

关键词： Li-ion batteries SEI film Electrochemical impedance spectroscopy Spinel LiMn2O4

Modeling the WMAP large-angle anomalies as an effect of a local density inhomogeneity

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Research in Astronomy and Astrophysics 2010年第2期10卷 116-124页

作者： Li-Ping He quan guo National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

We investigate large-angle scale temperature anisotropy in the Cosmic Microwave Background （CMB） with the Wilkinson Microwave Anisotropy Probe （WMAP） data and model the large-angle anomalies as the effect of the CMB quadrupole anisotropies caused by the local density inhomogeneities. The quadrupole caused by the local density inhomogeneities is different from the special relativity kinematic quadrupole. If the observer inhabits a strong inhomogeneous region, the lo- cal quadrupole should not be neglected. We calculate such local quadrupole under the assumption that there is a huge density fluctuation field in the direction （284°, 74°）, where the density fluctuation is 10-3, and its center is - 112 h-1 Mpc away from us. After removing such mock signals from WMAP data, the power in the quadrupole, C2, increases from the range （200 - 260 μK2） to - 1000 μK2. The quantity S, which is used to estimate the alignment between the quadrupole and the octopole, decreases from （0.7 - 0.74） to （0.31 - 0.37）, while the model predicts that C2 = 1071.5 μK2, and S = 0.412. So our local density inhomogeneity model can, in part, explain the WMAP low-l anomalies.

关键词： cosmology: cosmic microwave background -- cosmology: large-scale structure of universe