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Merging strangeon stars Ⅱ:the ejecta and light curves

Research in Astronomy and Astrophysics 2021年第10期21卷 86-96页

作者： xiao-Yu Lai Cheng-Jun xia) yun-Wei Yu ren-Xin Xu Department of Physics and Astronomy Hubei University of EducationWuhan 430205China Research Center for Astronomy Hubei University of EducationWuhan 430205China School of Information Science and Engineering NingboTech UniversityNingbo 315100China Institute of Astrophysics Central China Normal UniversityWuhan 430079China School of Physics Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

The state of supranuclear matter in compact stars remains puzzling,and it is argued that pulsars could be strangeon *** consequences of merging double strangeon stars are worth exploring,especially in the new era of multi-messenger *** develop the"strangeon kilonova"scenario proposed in Paper I,we make a qualitative description about the evolution of ejecta and light curves for merging double strangeon *** the hot environment of the merger,the strangeon nuggets ejected by tidal disruption and hydrodynamical squeezing would suffer from evaporation,in which process particles,such as strangeons,neutrons and protons,are *** into account both the evaporation of strangeon nuggets and the decay of strangeons,most of the strangeon nuggets would turn into neutrons and protons,within dozens of milliseconds after being *** evaporation rates of different particles depend on temperature,and we find that the ejecta could end up with two components,with high and low opacity *** high opacity component would be in the directions around the equatorial plane,and the low opacity component would be in a broad range of angular *** bolometric light curves show that the spin-down power of the long-lived remnant would account for the whole emission of kilonova AT2017gfo associated with GW170817,if the total ejected mass 10^(-3)M⊙.The detailed picture of merging double strangeon stars is expected to be tested by future numerical simulations.

关键词： dense matter equation of state pulsars:general

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Diffusion tensor interpolation profile control using non-uniform motion on a Riemannian geodesic

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第2期13卷 90-98页

作者： Chang-II SON Shun-ren xia MOE Key Laboratory of Biomedical Engineering Zhejiang UniversityHangzhou 310027China Department of Electronics Kim Chaek University of TechnologyPyongyang 104919DPR of Korea

Tensor interpolation is a key step in the processing algorithms of diffusion tensor imaging (DTI), such as registration and tractography. The diffusion tensor (DT) in biological tissues is assumed to be positive definite. However, the tensor interpolations in most clinical applications have used a Euclidian scheme that does not take this assumption into account. Several Rie-mannian schemes were developed to overcome this limitation. Although each of the Riemannian schemes uses different metrics, they all result in a ‘fixed’ interpolation profile that cannot adapt to a variety of diffusion patterns in biological tissues. In this paper, we propose a DT interpolation scheme to control the interpolation profile, and explore its feasibility in clinical applications. The profile controllability comes from the non-uniform motion of interpolation on the Riemannian geodesic. The interpolation experiment with medical DTI data shows that the profile control improves the interpolation quality by assessing the reconstruction errors with the determinant error, Euclidean norm, and Riemannian norm.

关键词： Diffusion tensor (DT) DT imaging (DTI) DT interpolation Interpolation profile control Riemannian geodesic

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Exponentially many maximum genus embeddings and genus embeddings for complete graphs

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Science China Mathematics 2008年第11期51卷 2013-2019页

作者： ren Han BAI yun Department of Mathematics East China Normal UniversityShanghai 200062China

There are many results on the maximum genus, among which most are written for the existence of values of such embeddings, and few attention has been paid to the estimation of such embeddings and their applications. In this paper we study the number of maximum genus embeddings for a graph and find an exponential lower bound for such numbers. Our results show that in general case, a simple connected graph has exponentially many distinct maximum genus embeddings. In particular, a connected cubic graph G of order n always has at least $ (\sqrt 2 )^{m + n + \tfrac{\alpha } {2}} $ distinct maximum genus embeddings, where α and m denote, respectively, the number of inner vertices and odd components of an optimal tree T. What surprise us most is that such two extremal embeddings (i.e., the maximum genus embeddings and the genus embeddings) are sometimes closely related with each other. In fact, as applications, we show that for a sufficient large natural number n, there are at least $ C2^{\tfrac{n} {4}} $ many genus embeddings for complete graph K n with n ≡ 4, 7, 10 (mod12), where C is a constance depending on the value of n of residue 12. These results improve the bounds obtained by Korzhik and Voss and the methods used here are much simpler and straight.

关键词： maximum genus embedding optimal tree current graph 05C10

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Transport Properties of Two-Dimensional Electron Gases in Antiparallel Magnetic-Electric Barrier Structures

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Communications in Theoretical Physics 2006年第2X期46卷 348-352页

作者： PING yun-xia CHENG Ze Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We study theoretically transport properties of two-dimenslonal electron gases through antiparallel magneticelectric barrier structures. Two kinds of magnetic barrier configurations are employed： one is that the strength of the double δ-functlon in opposite directions is equal and the other is that the strength is unequal Similarities and differences of electronic transports are presented. It is found that the transmission and the conductance depend strongly on the shape of the magnetic barrier and the height of the electric harrier. The results indicate that this system does not possess any spin filtering and spin polarization and electron gases can realize perfect resonant tunneling and wave-vector filtering properties. Moreover, the strength of the effect of the inhomogeneous magnetic field on the transport properties is discussed.

关键词： magnetic-electric barrier resonant tunneling wave-vector filtering transmission conductance

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Path signature-based XAI-enabled network time series classification

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Science China(Information Sciences) 2024年第7期67卷 91-106页

作者： Le SUN Yueyuan WANG Yongjun ren Feng xia Department of Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science and Technology School of Computing Technologies Royal Melbourne Institute of Technology

Classifying network time series(NTS) is crucial for automating network administration and ensuring cyberspace security. It enables the detection of anomalies, the identification of network attacks,and the monitoring of performance issues, thereby providing valuable support for network protection and optimization. However, modern communication networks pose challenges for NTS classification *** include handling large-scale and complex NTS data, extracting features from intricate datasets, and addressing explainability requirements. These challenges are particularly pronounced for complex 5G networks. Notably, explainability has become crucial for the widespread deployment of network automation for 5G networks and beyond. To tackle these challenges, we propose a path-signature-based NTS classification model called recurrent signature(Recur Sig). This innovative model is designed to overcome the time-consuming feature selection problem by utilizing deep-learning(DL) techniques. Additionally, it provides a solution for addressing the black-box issue associated with DL models in network automation systems(NAS) by incorporating an explainable classification approach. Extensive experimentation on various public datasets demonstrates that Recur Sig outperforms existing models in accuracy and explainability. The results indicate its potential for application in cyberspace security and automated network management, offering an explainable solution for network protection and optimization.

关键词： network time series classification explainable artificial intelligence path signature automated network management recurrent neural network

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L log L criterion for a class of multitype superdiffusions with non-local branching mechanisms

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Science China Mathematics 2019年第8期62卷 1439-1462页

作者： Zhen-Qing Chen Yan-xia ren renming Song Department of Mathematics University of Washington Seattle WA 98195 USA LMAM School of Mathematical Sciences & Center for Statistical SciencePeking University Beijing 100871 China Department of Mathematics University of Illinois Urbana IL 61801 USA

In this paper, we provide a pathwise spine decomposition for multitype superdiffusions with nonlocal branching mechanisms under a martingale change of measure. As an application of this decomposition,we obtain a necessary and sufficient condition(called the L log L criterion) for the limit of the fundamental martingale to be non-degenerate. This result complements the related results obtained in Kyprianou et al.(2012),Kyprianou and Murillo-Salas(2013) and Liu et al.(2009) for superprocesses with purely local branching mechanisms and in Kyprianou and Palau(2018) for super Markov chains.

关键词： multitype superdiffusion non-local branching mechanism switched diffusion spine decomposition martingale

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Fujita Type Conditions to Heat Equation with Variable Source

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 63-68页

作者： yun-xia LIU yun-hua WANG Si-ning ZHENG School of Mathematical Sciences Dalian University of Technology School of Mathematical Sciences Harbin Normal University

This paper studies heat equation with variable exponent ut = △u ＋ Up（x） 4- Uq in RN × （0, T）, where p（x） is a nonnegative continuous, bounded function, 0 〈 p- = infp（x） ≤ p（x） ≤ supp（x） = p＋. It is easy to understand for the problem that all nontrivial nonnegative solutions must be global if and only if max{p＋,q} ≤1. Based on the interaction between the two sources with fixed and variable exponents in the model, some Fujita type conditions are determined that that all nontrivial nonnegative solutions blow up in finite time if 0 〈 q ≤ 1 with p＋〉 1, or 1 〈 q 〈 1 ＋2/N. In addition, if q 〉 1 ＋2/N, then （i） all solutions blow up in finite time with 0 〈 p- ≤ p＋ ≤ 1 ＋2/N; （ii） there are both global and nonglobal solutions for p- ≤ 1 ＋ 2/N; and （iii） there are functions p（x） such that all solutions blow up in finite time, and also functions p（x） such that the problem possesses global solutions when p＋〈 1＋2/N 〈 p＋.

关键词： variable source Fujita type condition heat equation global solutions blow-up

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Calculation Model and Allocation Strategy of Network Usage Charge for Peer-to-peer and Community-based Energy Transaction Market

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 144-155页

作者： Dong Han Lei Wu Xijun ren Shiwei xia Electrical Engineering Department University of Shanghai for Science and TechnologyShanghai 200093China State Grid Anhui Electric Power Economic Research Institute Hefei 230022China Electrical Engineering Department North China Electric Power UniversityBeijing 102206China

The emergence of prosumers in distribution systems has enabled competitive electricity markets to transition from traditional hierarchical structures to more decentralized models such as peer-to-peer(P2P)and community-based(CB)energy transaction ***,the network usage charge(NUC)that prosumers pay to the electric power utility for network services is not adjusted to suit these energy transactions,which causes a reduction in revenue streams of the *** this study,we propose an NUC calculation method for P2P and CB transactions to address holistically economic and technical issues in transactive energy markets and distribution system operations,*** on the Nash bargaining(NB)theory,we formulate an NB problem for P2P and CB transactions to solve the conflicts of interest among prosumers,where the problem is further decomposed into two convex subproblems of social welfare maximization and payment *** then build the NUC calculation model by coupling the NB model and AC optimal power flow *** also employ the Shapley value to allocate the NUC to consumers fairly for the NUC model of CB ***,numerical studies on IEEE 15-bus and 123-bus distribution systems demonstrate the effectiveness of the proposed NUC calculation method for P2P and CB transactions.

关键词： Electricity market network usage charge distribution locational marginal prices Shapley value Nash bargaining transactive energy peer-to-peer transaction community-based transaction

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Frequency invariability of acoustic field and passive source range estimation in shallow water

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Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 225-232页

作者： ZHOU ShiHong QI YuBo ren yun State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences

The frequency invariability of the warped modal signal and the warped signal autocorrelation function in shallow water is discussed.A method is proposed for passive source-range estimation based on the frequency invariability and warping transform of signal autocorrelation function received by a single hydrophone in a range-independent or weak range-dependent shallow water *** the method,a guided source with a known range is employed to provide the crucial and relative invariant scaled *** experimental data in shallow water with an iso-speed profile and a fluctuated thermocline are used to verify this *** relative errors of the source range estimation are basically less than 10%.

关键词： frequency invariability warping transform autocorrelation function passive range estimation single hydrophone

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A Sex-linked Microsatellite Marker Reveals Male Heterogamety in Quasipaa boulengeri(Anura: Dicroglossidae)

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Asian Herpetological Research 2017年第3期18卷 184-189页

作者： Siqi YUAN yun xia xiaomao ZENG Department of Herpetology Chengdu Institute of BiologyChinese Academy of Sciences University of Chinese Academy of Sciences

Few amphibians possess morphologically distinguishable heteromorphic sex *** classic indirect method is a time-consuming and resource-demanding task to identify the heterogametic *** we have taken advantage of a sex-specific microsatellite marker,by amplifying a large number of samples of known male and female individuals from various populations,to reveal a homogeneous pattern of male heterogamety in Quasipaa *** identification of the heterogametic sex will help interpreting the evolution of sex *** relevance for evolutionary studies of sex determination,the sex-linked markers have potential for addressing practical issues in conservation biology because the sex reversal that caused by anthropogenic endocrine disruptors is considered as a reason for amphibian decline.

关键词： microsatellites sex-specific marker male heterogamety Quasipaa boulengeri

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