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Multi-band Photometric and Spectroscopic Analysis of the Dwarf Nova IU Leo 认领 引用
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作者 Y.H.Chen C.M.Duan H.Shu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第1期24-31,共8页
IU Leo was first identified as a cataclysmic variable star in 2006.Based on image data and a distance value,we derived that the circumbinary envelope of IU Leo was~3745 au on the optical band.According to the multi-ba... IU Leo was first identified as a cataclysmic variable star in 2006.Based on image data and a distance value,we derived that the circumbinary envelope of IU Leo was~3745 au on the optical band.According to the multi-band photometric data,we calculated a Teff of a few hundred Kelvin for the circumbinary envelope of IU Leo.We reviewed the physical parameters of IU Leo and simulated the evolution process using a stellar evolution code MESA with M1=0.982 M⊙,M2=0.835 M⊙,and an orbital period of 0.376308 day.The evolved other parameters are basically consistent with the parameters in the literatures.Based on the quiescence Kepler Mission 2.0 light curve,the quiescence Transiting Exoplanet Survey Satellite light curve,and 89 Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)medium resolution spectra,we derived an orbital period of 0.376307±0.000004 days,0.3762±0.0001 days,and 0.3763 day for IU Leo respectively.These orbital periods are basically consistent with the results of previous studies.According to the light curve of IU Leo from the American Association of Variable Star Observers,we reported three new outburst spectra from the LAMOST low resolution catalogue with a part of the Balmer emission lines overlap on their absorption lines.Many H,He,C,N,O,Na,Mg,Si,and Ca neutral and ionized lines are identified,which are produced by different mechanisms.In the future,we will conduct more comprehensive and indepth research on CVs based on multi-band photometric and spectroscopic data. 展开更多
关键词 (stars)binaries(including multiple) close-(stars) novae,cataclysmic variables-stars mass-loss
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A novel polyoxometalate-cobalt composite for efficiency activation of peroxymonosulfate for tetracycline degradation:From mechanisms to practical potential 认领 引用
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作者 Baizhuang Li Yuqi Liu +6 位作者 Xinying Wang Biao Li Yusi He Yufeng Zhang Yuebin Feng Huilong Luo Wei Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期109-119,共11页
Co based materials or peroxymonosulfate(PMS)are regarded as promising catalysts in pollutants control due to their good performance for PMS activation.Herein,a novel composite catalyst Co@POM with highly efficient act... Co based materials or peroxymonosulfate(PMS)are regarded as promising catalysts in pollutants control due to their good performance for PMS activation.Herein,a novel composite catalyst Co@POM with highly efficient active sites was synthesized via hydrothermal method,and was systematically characterized using XRD,SEM,XPS,IR,BET and TG/DTG analyses.The prepared composite was used as PMS activator for the tetracycline(TC)degradation.Effects of PMS concentration,Co@POM dosage,TC concentration,pH,temperature and anions on degradation performances were investigated systematically.The system exhibited a high TC degradation efficiency of 98.1%,with robust performance across a broad pH range and in various water matrices.Quenching experiments and EPR spectroscopy illustrated that reactive species including singlet oxygen(1O2),and superoxide radicals(O2·-)played main roles in the degradation of electron-rich TC molecules.The catalyst maintained more than 90% degradation efficiency after four cycles without any change in structural properties.The renewable active sites of Co@POM and the activation mechanism of PMS in the Co@POM/PMS system were elucidated.Overall,the present work advances the design of PMS-activating catalysts by integrating POM with transition metals,offering a scalable,eco-friendly alternative for the treatment of antibiotic-contaminated wastewater. 展开更多
关键词 Co@POM Peroxymonosulfate(PMS)activation Tetracycline(TC) Degradation
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Probing Star-forming Properties via ALMA Observations of Massive Protocluster IRAS 15596-5301 认领 引用
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作者 Faxian Chang Mengyao Tang +8 位作者 Tie Liu Luis A.Zapata Dongting Yang Yaping Peng Chao Zhang Fengwei Xu Y.H.Chen Shujie Li Meng Ruan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第5期63-77,共15页
To deepen our understanding of star-forming properties,we studied a massive protocluster IRAS 15596-5301(I15596)using ALMA 870μmand 3 mm data.High-resolution 870μm data reveal 34 dense cores,including three hot mole... To deepen our understanding of star-forming properties,we studied a massive protocluster IRAS 15596-5301(I15596)using ALMA 870μmand 3 mm data.High-resolution 870μm data reveal 34 dense cores,including three hot molecular cores,with subsequent line surveys detecting 22 molecular species toward them.Two velocity components(I15596-red/I15596-blue)were found in the averaged H13CO+(1–0)spectrum,and two filaments were identified from velocity-resolved integrated intensity maps.A spatial overlap between the two filaments was observed,and this overlapping region exhibits a distinct bridge-shaped feature in the position–velocity diagram constructed along the entire filamentary structures.Combined with the reduced H13CO+/HCO+ ratio in the overlapping region and the three-dimensional position-position–velocity cube data,we conclude that a non-head-on collision occurs between the edges of the two filamentary structures in I15596.Cluster analysis demonstrates that clusters located in the collision region host more evolved chemical rich dense cores than their counterparts in other regions.Our results thus indicate that star formation in I15596 is triggered or accelerated by a mild non-head-on collision between two filaments. 展开更多
关键词 stars formation-ISM clouds-ISM kinematics and dynamics-ISM molecules
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Finite-Size Scaling Behaviors of Eigen Microstates near the Critical Point 认领 引用
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作者 Gaoke Hu Jia-Qi Dong +4 位作者 Yongwen Zhang Teng Liu Wen-Long You Maoxin Liu Xiaosong Chen 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期1-12,共12页
In the eigen microstate approach(EMA),phase emergence is signaled by the condensation of an eigen microstate with a finite eigenvalue.The associated eigenvalue acts as an order parameter,exhibiting finite-size scaling... In the eigen microstate approach(EMA),phase emergence is signaled by the condensation of an eigen microstate with a finite eigenvalue.The associated eigenvalue acts as an order parameter,exhibiting finite-size scaling(FSS)behaviors within the critical regime.The eigen microstate derived from EMA precisely characterizes the spatial structure of the emergent phase,which remains less explored in systems lacking translational invariance.Here,we propose an FSS form for the eigen microstate itself and numerically validate it using the two-dimensional Ising model under various boundary conditions.This result enables the derivation of FSS relations for correlation functions,which we verify through numerical simulations.Our results complete the FSS formalism for the EMA. 展开更多
关键词 condensation eigen microstate finite size scaling eigen microstate approach critical regimethe fss form eigen microstate order parameter eigen microstate approach ema phase emergence
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BLOW-UP OF SMOOTH SOLUTIONS TO THE 3D FULL COMPRESSIBLE MAGNETOHYDRODYNAMIC FLOWS 认领 引用
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作者 Xi HE Xiuqing WANG Yuming QIN 《Acta Mathematica Scientia》 SCIE CSCD 2026年第4期1885-1894,共10页
In this paper,we consider the full compressible magnetohydrodynamic(MHD)equations with nonnegative thermal conductivity or infinite electric conductivity under two different types of boundary conditions.The proof is b... In this paper,we consider the full compressible magnetohydrodynamic(MHD)equations with nonnegative thermal conductivity or infinite electric conductivity under two different types of boundary conditions.The proof is based on a priori estimates on the energy functional for a new observable construction with an auxiliary function,and it is shown that,under suitable boundary conditions and assumptions on the initial data,the smooth solution blows up in a finite time. 展开更多
关键词 full compressible MHD equations blow-up Cauchy problem Neumann boundary condition
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Asteroseismology of the DAV Star TIC 207206751 认领 引用
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作者 Z.Sun Y.H.Chen M.Y.Tang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第1期49-57,共9页
TIC 207206751 is a DAV star,which was observed intermittently by the Transiting Exoplanet Survey Satellite for more than 1000 hr from 2020 August to October.The Romero team performed detailed processing on the corresp... TIC 207206751 is a DAV star,which was observed intermittently by the Transiting Exoplanet Survey Satellite for more than 1000 hr from 2020 August to October.The Romero team performed detailed processing on the corresponding observational data and reported 10 observation periods for the star.Based on these 10 observation periods,we identified three incomplete quintuplets and three single modes.The rotation period of TIC 207206751 is determined via frequency splitting analysis to be 44.60±1.97 hr.We used WDEC(v20)to evolve large sample models and conducted asteroseismological analyses of TIC 207206751.Two optimal models were obtained:model 1 with Teff=12,600±10 K,M*=0.630±0.005 M⊙,and model 2 with Teff=10,600±10 K,M*=0.540±0.005 M⊙.Both models feature thin H atmospheres(with-log(MH/M*)≈7.00),reasonable central O abundances(h1≈0.60),and smallσRMS values(less than 0.15 s).Using the luminosities of the two optimal models evolved from WDEC(v20),we calculated their asteroseismological distances as 36.54±0.28 pc(model 1)and 33.08±0.27 pc(model 2),respectively.Compared with the Gaia trigonometric parallax distance(34.86±0.03 pc),the differences between the two optimal models are around 5%.Based on the parameters of these two optimal models and previous studies,we tend to think that TIC 207206751 is a low Teff DAV star. 展开更多
关键词 (stars)white dwarfs-asteroseismology-stars individual(TIC 207206751)
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Mode Identification Revisit and Asteroseismology of the DAV Star TIC 231277791 认领 引用
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作者 Z.K.Yao Y.H.Chen M.Y.Tang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第4期235-243,共9页
White dwarfs(WDs)are the final stage for most low and intermediate mass stars,which play an important role in understanding stellar evolution and galactic history.Here we performed an asteroseismological analysis on T... White dwarfs(WDs)are the final stage for most low and intermediate mass stars,which play an important role in understanding stellar evolution and galactic history.Here we performed an asteroseismological analysis on TIC 231277791 based on 10 independent modes reported by Romero et al.Two groups of modes were identified with frequency splitting:mode identification_1 with one l=1,m=0 mode,two l=2,m=0 modes,and three l=1 or 2,m=0 modes,and mode identification_2 with one l=1,m=0 mode,three l=2,m=0 modes,and one l=1 or 2,m=0 mode.The rotation period is derived to be 41.64±2.73 hr for TIC 231277791.We established a large sample(7,558,272)of DAV star models using the White Dwarf Evolution Code(WDEC;2018,v16),resulting of optimal models with model_1(mode identification_1):M*=0.570±0.005 M⊙,Teff=11300±10 K,-log(MH/M*)=9.15±0.01,-log(MHe/M*)=4.94±0.01,andσrms=0.06 s,and model_2(mode identification_2):M*=0.720±0.005 M⊙,Teff=1910±10 K,-log(MH/M*)=6.11±0.01,-log(MHe/M*)=3.09±0.01,andσrms=0.04 s.The central oxygen abundances are 0.71(optimal model_1)and 0.72(optimal model_2),respectively,which are consistent with the results of stellar structure and evolution theory. 展开更多
关键词 asteroseismology (stars:)white dwarfs (stars:)pulsars:individual(TIC 231277791)
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Flow pattern visualization and nonlinear analysis of gas-liquid mixing process with top-blowing gas stirring 认领 引用 被引量：5
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作者 YANG Kai WANG Shi-bo +2 位作者 ZHU Xiu-le XU Jian-xin WANG Hua 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2029-2040,共12页
The evaluation of the mixing effect of gas-liquid two-phase flow during the top-blown gas agitation mixing is one of the difficulties in the testing field, especially in the process of using the model method to study ... The evaluation of the mixing effect of gas-liquid two-phase flow during the top-blown gas agitation mixing is one of the difficulties in the testing field, especially in the process of using the model method to study the metallurgical top-blowing process. In order to evaluate the effect of gas-liquid two-phase flow mixing, a gas chromatography simulation based on capacitance tomography was used to visualize the flow pattern and analyze the mixed characteristics. A gas top-blown agitation test rig was set up, the gas phase was air-selected, and the liquid phase was selected from synthetic heat-conducting oil. The top-blown stirring test process was measured and imaged by electrical capacitance tomography (ECT) equipment from ECT Instruments Ltd (UK). The MATLAB program was used to identify the mixing areas of the images to obtain the distribution of gas-liquid two-phase. The flow pattern of the gas-liquid mixing region was obtained. The chaotic detection of the gas-liquid mixing process was performed by the three-state test method;the images were processed by the counting box dimension-corrosion method to obtain the mixing uniformity time of gas-liquid flow. Results show that it is feasible to use the capacitance tomography technique to visualize the gas-liquid two-phase distribution. The uniformity time quantification of the gas-liquid mixing process is also achieved. 展开更多
关键词 top-blowing electrical capacitance tomography gas-liquid mixing visualization three-state test mixing uniformity time
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Irreversibility of a quantum walk induced by controllable decoherence employing random unitary operations 认领 引用 被引量：5
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作者 徐酉阳 周飞 +3 位作者 陈亮 谢艺 薛鹏 冯芒 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期74-81,共8页
Quantum walk is different from random walk in reversibility and interference. Observation of the reduced reversibility in a realistic quantum walk is of scientific interest in understanding the unique quantum behavior... Quantum walk is different from random walk in reversibility and interference. Observation of the reduced reversibility in a realistic quantum walk is of scientific interest in understanding the unique quantum behavior. We propose an idea to experimentally investigate the decoherence-induced irreversibility of quantum walks with trapped ions in phase space via the average fidelity decay. By introducing two controllable decoherence sources, i.e., the phase damping channel （i.e., dephasing） and the high temperature amplitude reservoir （i.e., dissipation）, in the intervals between the steps of quantum walk, we find that the high temperature amplitude reservoir shows more detrimental effects than the phase damping channel on quantum walks. Our study also shows that the average fidelity decay works better than the position variance for characterizing the transition from quantum walks to random walk. Experimental feasibility to monitor the irreversibility is justified using currently available techniques. 展开更多
关键词 quantum walk irreversibility trapped ions average fidelity decay
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Exploring clogging of interacting particles with hydrodynamic memory in a corrugated channel:A promising sensor of non-Brownian diffusion 认领 引用
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作者 Yuhui Luo Chunhua Zeng Tao Huang 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第8期26-35,共10页
Particle transport is a fundamental aspect of various systems,from artificial to biological.A common assumption is that particle motion follows Markovian(memoryless)processes in the absence of interaction between part... Particle transport is a fundamental aspect of various systems,from artificial to biological.A common assumption is that particle motion follows Markovian(memoryless)processes in the absence of interaction between particles.However,hydrodynamic memory and the interaction between particles are ubiquitous,leaving many fundamental questions unanswered regarding transport of interacting particles involving hydrodynamic drag in corrugated channels,as described by the fractional Langevin equation.This study examines the hydrodynamic transport of interacting non-Brownian particles moving within a corrugated channel.We propose a method that relies on factors such as temperature,the driving force to alternate between no transport and finite net transport.Of importance is to note that the absence of transport results from the clogging,while the transport consists of collective motion and independent motion.The transport systems investigated in this work suggest the potential for sensor functionality within the system.Our findings may prove valuable for exploring the transport with hydrodynamic memory in various fields,including biology,physics,and chemistry. 展开更多
关键词 particle transport clogging non-Brownian diffusion hydrodynamic memory sensor
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One-pot synthesis of N-aryl propargylamine from aromatic boronic acid,aqueous ammonia,and propargyl bromide under microwave-assisted conditions 认领 引用 被引量：2
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作者 Yu-Bo Jiang Wen-Sheng Zhang +2 位作者 Hui-Ling Cheng Yu-Qi Liu Rui Yang 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第5期779-782,共4页
A facile,one-pot synthesis of N-aryl propargylamine from aromatic boronic acid,aqueous ammonia,and propargyl bromide has been achieved under microwave-assisted conditions.The reactions can be smoothly completed within... A facile,one-pot synthesis of N-aryl propargylamine from aromatic boronic acid,aqueous ammonia,and propargyl bromide has been achieved under microwave-assisted conditions.The reactions can be smoothly completed within a total 10 min through a two-step procedure,including copper-catalyzed coupling of aromatic boronic acids with aqueous ammonia and following propargylation by propargyl bromide. 展开更多
关键词 One-pot Microwave N-Aryl propargylamine Aromatic boronic acid Aqueous ammonia Propargyl bromide
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Manipulation strategy of cation inhomogeneity in perovskite solar cells 认领 引用 被引量：1
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作者 Jiale Sun Xuxia Shai +6 位作者 Weitao chen Shenchao Li Jinlan He Xinxing Liu Dongmei He Yue Yu Jiangzhao Chen 《Journal of Semiconductors》 EI CAS CSCD 2025年第5期9-12,共4页
In recent years, the research advancements have high-lighted the critical role of the A-site cation in determining the optoelectronic and physicochemical properties of organicinorganic lead halide perovskites. Mixed-c... In recent years, the research advancements have high-lighted the critical role of the A-site cation in determining the optoelectronic and physicochemical properties of organicinorganic lead halide perovskites. Mixed-cation perovskites(MCPs) have been extensively used as absorber thin films in perovskite solar cells(PSCs), achieving high power conversion efficiencies(PCE) over 26%^([1, 2]). 展开更多
关键词 cation inhomogeneity perovskite solar cells pscs perovskite solar cells absorber thin films mixed cation perovskites organicinorganic lead halide perovskites power conversion efficiency
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Thermal fluctuations,deflection angle,and greybody factor of a high-dimensional Schwarzschild black hole in scalar-tensor-vector gravity 认领 引用
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作者 Qian Li Yu Zhang +1 位作者 Qi-Quan Li Qi Sun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2024年第11期100-112,共13页
In this study,we examined the thermal fluctuations,deflection angle,and greybody factor of a high-dimensional Schwarzschild black hole in scalar-tensor-vector gravity(STVG).We calculated some thermodynamic quantities ... In this study,we examined the thermal fluctuations,deflection angle,and greybody factor of a high-dimensional Schwarzschild black hole in scalar-tensor-vector gravity(STVG).We calculated some thermodynamic quantities related to the correction of the black hole entropy caused by thermal fluctuations and discussed the effect of the correction parameters on these quantities.By analyzing the changes in the corrected specific heat,we found that thermal fluctuations made the small black hole more stable.It is worth noting that the STVG parameter did not affect the thermodynamic stability of this black hole.Additionally,by utilizing the Gauss-Bonnet theorem,the deflection angle was obtained in the weak field limit,and the effects of the two parameters on the results were visualized.Finally,we calculated the bounds on the greybody factor of a massless scalar field.We observed that as the STVG parameter around the black hole increased,the weak deflection angle became larger,and more scalar particles can reach infinity.However,the spacetime dimension has the opposite effect on the STVG parameter on the weak deflection angle and greybody factor. 展开更多
关键词 black hole thermal fluctuations deflection angle greybody factor
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Variable selection for skew-normal mixture of joint location and scale models 认领 引用
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作者 WU Liu-cang YANG Song-qin TAO Ye 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2021年第4期475-491,共17页
Although there are many papers on variable selection methods based on mean model in the nite mixture of regression models,little work has been done on how to select signi cant explanatory variables in the modeling of ... Although there are many papers on variable selection methods based on mean model in the nite mixture of regression models,little work has been done on how to select signi cant explanatory variables in the modeling of the variance parameter.In this paper,we propose and study a novel class of models:a skew-normal mixture of joint location and scale models to analyze the heteroscedastic skew-normal data coming from a heterogeneous population.The problem of variable selection for the proposed models is considered.In particular,a modi ed Expectation-Maximization(EM)algorithm for estimating the model parameters is developed.The consistency and the oracle property of the penalized estimators is established.Simulation studies are conducted to investigate the nite sample performance of the proposed methodolo-gies.An example is illustrated by the proposed methodologies. 展开更多
关键词 heterogeneous population skew-normal(SN)distribution mixture of joint location and scale models variable selection EM algorithm
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Band engineering of honeycomb monolayer CuSe via atomic modification 认领 引用
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作者 Lei Gao Yan-Fang Zhang +1 位作者 Jia-Tao Sun Shixuan Du 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期495-499,共5页
Two-dimensional monolayer copper selenide(CuSe)has been epitaxially grown and predicted to host the Dirac nodal line fermion(DNLF).However,the metallic state of monolayer CuSe inhibits the potential application of nan... Two-dimensional monolayer copper selenide(CuSe)has been epitaxially grown and predicted to host the Dirac nodal line fermion(DNLF).However,the metallic state of monolayer CuSe inhibits the potential application of nanoelectronic devices in which a band gap is needed to realize on/off properties.Here,we engineer the band structure of monolayer CuSe which is an analogue of a p-doped system via external atomic modification in an effort to realize the semiconducting state.We find that the H and Li modified monolayer CuSe shifts the energy band and opens an energy gap around the Fermi level.Interestingly,both the atomic and electronic structures of monolayer CuHSe and CuLiSe are very different.The H atoms bind on top of Se atoms of monolayer CuSe with Se-H polar covalent bonds,annihilating the DNLF band of monolayer CuSe dominated by Se orbitals.In contrast,Li atoms prefer to adsorb at the hexagonal center of CuSe,preserving the DNLF band of monolayer CuSe dominated by Se orbitals,but opening band gaps due to a slight buckling of the CuSe layer.The realization of metal-to-semiconductor transition from monolayer CuSe to CuXSe(X=H,Li)as revealed by first-principles calculations makes it possible to use CuSe in future electronic devices. 展开更多
关键词 first-principles calculations monolayer CuSe band engineering
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A Critical Review of Active Distribution Network Reconfiguration:Concepts,Development,and Perspectives 认领 引用
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作者 Bo Yang Rui Zhang +10 位作者 Jie Zhang Xianlong Cheng Jiale Li Yimin Zhou Yuanweiji Hu Bin He Gongshuai Zhang Xiuping Du Si Ji Yiyan Sang Zhengxun Guo 《Energy Engineering》 EI 2024年第12期3487-3547,共61页
In recent years,the large-scale grid connection of various distributed power sources has made the planning and operation of distribution grids increasingly complex.Consequently,a large number of active distribution ne... In recent years,the large-scale grid connection of various distributed power sources has made the planning and operation of distribution grids increasingly complex.Consequently,a large number of active distribution network reconfiguration techniques have emerged to reduce system losses,improve system safety,and enhance power quality via switching switches to change the system topology while ensuring the radial structure of the network.While scholars have previously reviewed these methods,they all have obvious shortcomings,such as a lack of systematic integration of methods,vague classification,lack of constructive suggestions for future study,etc.Therefore,this paper attempts to provide a comprehensive and profound review of 52 methods and applications of active distribution network reconfiguration through systematic method classification and enumeration.Specifically,these methods are classified into five categories,i.e.,traditional methods,mathematical methods,meta-heuristic algorithms,machine learning methods,and hybrid methods.A thorough comparison of the various methods is also scored in terms of their practicality,complexity,number of switching actions,performance improvement,advantages,and disadvantages.Finally,four summaries and four future research prospects are presented.In summary,this paper aims to provide an up-to-date and well-rounded manual for subsequent researchers and scholars engaged in related fields. 展开更多
关键词 Active distribution network reconfiguration meta-heuristic algorithm machine learning
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Heteroscedastic Laplace mixture of experts regression models and applications 认领 引用
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作者 WU Liu-cang ZHANG Shu-yu LI Shuang-shuang 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2021年第1期60-69,共10页
Mixture of Experts(MoE)regression models are widely studied in statistics and machine learning for modeling heterogeneity in data for regression,clustering and classification.Laplace distribution is one of the most im... Mixture of Experts(MoE)regression models are widely studied in statistics and machine learning for modeling heterogeneity in data for regression,clustering and classification.Laplace distribution is one of the most important statistical tools to analyze thick and tail data.Laplace Mixture of Linear Experts(LMoLE)regression models are based on the Laplace distribution which is more robust.Similar to modelling variance parameter in a homogeneous population,we propose and study a new novel class of models:heteroscedastic Laplace mixture of experts regression models to analyze the heteroscedastic data coming from a heterogeneous population in this paper.The issues of maximum likelihood estimation are addressed.In particular,Minorization-Maximization(MM)algorithm for estimating the regression parameters is developed.Properties of the estimators of the regression coefficients are evaluated through Monte Carlo simulations.Results from the analysis of two real data sets are presented. 展开更多
关键词 mixture of experts regression models heteroscedastic mixture of experts regression models,Laplace distribution MM algorithm
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Tracing the Evolutionary Stage of Low-mass Dense Cores by Using the Abundance Ratio of SO to SO2 认领 引用
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作者 Meng-Yao Tang Sheng-Li Qin +8 位作者 Tie Liu Ya-Ping Peng Dong-Ting Yang Chao Zhang Xiao-Hu Li Yan-Hui Chen Shu-Jie Li Fa-Xian Chang Meng Ruan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第9期237-245,共9页
Sulfur-bearing molecules are frequently detected in star-forming regions.The abundance ratio of SO to SO2(hereafter,SO/SO2 ratio)has been proposed as a potential evolutionary tracer of star formation because ten... Sulfur-bearing molecules are frequently detected in star-forming regions.The abundance ratio of SO to SO2(hereafter,SO/SO2 ratio)has been proposed as a potential evolutionary tracer of star formation because tentative correlations have been found between SO/SO2 ratio and evolutionary stages.Nonetheless,the lack of highresolution observations and extensive statistical analyses of large samples raises questions regarding its efficacy as an evolutionary tracer.In this study,we analyze 31 protostellar cores with both SO and SO2 detection to investigate the relationship between the SO/SO2 ratio and two evolutionary parameters of chemical richness factor and gas temperatures.The correlations between SO/SO2 ratio and evolutionary parameters have been found,but these correlations are mainly contributed by low-mass cores rather than high-mass cores.Our findings suggest that the SO/SO2 ratio serves as a reliable evolutionary tracer for low-mass dense cores.In high-mass cores,the relationship between the SO/SO2 ratio and evolutionary stage remains ambiguous.This likely arises from both vigorous stellar feedback effects and the potential absence of distinct evolutionary stages analogous to those in low-mass cores.Consequently,higher-resolution observations with expanded statistical samples are required to assess the viability of SO/SO2 ratio as an evolutionary tracer for high-mass cores. 展开更多
关键词 stars formation-stars evolution-submillimeter ISM-ISM molecules
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Three-Level Λ-Type Atomic System Localized by the Parameters of the Two Orthogonal Standing-Wave Fields 认领 引用
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作者 Shuncai Zhao Qixuan Wu 《Journal of Applied Mathematics and Physics》 2016年第8期1546-1553,共8页
Localization of the three-level Λ-type atomic system interacting with two orthogonal standing-wave fields is proposed. Two equal and tunable peaks in the 2D plane are obtained by the detunings corresponding to the tw... Localization of the three-level Λ-type atomic system interacting with two orthogonal standing-wave fields is proposed. Two equal and tunable peaks in the 2D plane are obtained by the detunings corresponding to the two orthogonal standing-wave fields when the decreasing intensities of spontaneously generated coherence (SGC) arise in the three-level Λ-type atomic system, while one circular ring with shrinking radii in the 2D plane is obtained by the adjusted phases and wave vectors of the standing-wave fields when the increasing intensities of SGC occur in the three-level Λ-type atomic system. 2D atom localization with the single ring with shrinking radii realized by the multiple parametric manipulations demonstrated the flexibility for our scheme. 展开更多
关键词 Three-Level Λ-Type Atomic System Atom Localization Spontaneously Generated Coherence (SGC)
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A skew–normal mixture of joint location, scale and skewness models 认领 引用 被引量：3
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作者 LI Hui-qiong WU Liu-cang YI Jie-yi 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2016年第3期283-295,共13页
Normal mixture regression models are one of the most important statistical data analysis tools in a heterogeneous population. When the data set under consideration involves asymmetric outcomes, in the last two decades... Normal mixture regression models are one of the most important statistical data analysis tools in a heterogeneous population. When the data set under consideration involves asymmetric outcomes, in the last two decades, the skew normal distribution has been shown beneficial in dealing with asymmetric data in various theoretic and applied problems. In this paper, we propose and study a novel class of models： a skew-normal mixture of joint location, scale and skewness models to analyze the heteroscedastic skew-normal data coming from a heterogeneous population. The issues of maximum likelihood estimation are addressed. In particular, an Expectation-Maximization （EM） algorithm for estimating the model parameters is developed. Properties of the estimators of the regression coefficients are evaluated through Monte Carlo experiments. Results from the analysis of a real data set from the Body Mass Index （BMI） data are presented. 展开更多
关键词 mixture regression models mixture of joint location scale and skewness models EM algorithm maximum likelihood estimation skew-normal mixtures
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