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Presbyphagia:Dysphagia in the elderly

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World Journal of Clinical Cases 2023年第11期11卷 2363-2373页

作者： hai-yang feng Ping-Ping Zhang Xiao-Wen Wang School of Rehabilitation Medicine Weifang Medical UniversityWeifang 261021Shandong ProvinceChina

Dysphagia has been classified as a“geriatric syndrome”and can lead to serious complications that result in a tremendous burden on population health and healthcare resources worldwide.A characteristic age-related change in swa-llowing is defined as“presbyphagia.”Medical imaging has shown some changes that seriously affect the safety and efficacy of ***,there is a general lack of awareness of the effects of aging on swallowing function and a belief that these changes are part of normal *** review provides an overview of presbyphagia,which has been a neglected health problem for a long *** and awareness of dysphagia in the elderly population should be strengthened,and targeted intervention measures should be actively imple-mented.

关键词： Aging Dysphagia Presbyphagia Geriatric syndromes Swallowing

A Study on Low Frequency Electromagnetic Cyclotron Waves in the Solar Wind

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Research in Astronomy and Astrophysics 2022年第6期22卷 72-80页

作者： hai-feng yang Guo-Qing Zhao Heng-Qiang feng Gilbert Pi Qiang Liu Liang Xiang Qiu-Huan Li Institute of Space Physics Luoyang Normal UniversityLuoyang 471934China Henan Key Laboratory of Electromagnetic Transformation and Detection Luoyang 471934China Faculty of Mathematics and Physics Charles UniversityPrague 12116Czech Republic

According to Wind observations between 2005 and 2015,this paper investigates the dependences of the occurrence of low frequency electromagnetic cyclotron waves(ECWs)on the plasma parameters,the solar cycle,and the orientations of alpha-proton drift velocity(Vd)and the ambient magnetic field(B).The occurrence rates of ECWs with respect to six plasma parameters are *** show that the preferential conditions for generation of left-handed(LH)ECWs are higher proton temperature(Tp),higher proton velocity(Vp),lower proton density(Np),stronger proton temperature anisotropy(T⊥/T‖),higher normalized alpha-proton drift velocity(Vd/VA),and higher normalized alpha particle density(Nα/Np),where T⊥and T‖refer to proton temperatures perpendicular and parallel to B,and VAis the local Alfvén *** right-handed(RH)ECWs,however,the dependences on these plasma parameters are not *** the other hand,it is found that the occurrence rate of LH ECWs increases as the sunspot number decreases,and decreases as the sunspot number *** investigation shows that the increased occurrence rate of LH ECWs is accompanied by an increase in the medians of Vp,Vd/VA,and Nα/*** RH ECWs,the occurrence rate appears to be nearly unrelated to the sunspot number,suggesting a negligible correlation with the solar *** addition,a modified angle is introduced to include the factors of orientation of B(anti-sunward or sunward)and angle between Vdand B,*** is found that the occurrence of LH ECWs has the strong preferential condition that Vdis anti-sunward,while a different situation arises for RH *** results are discussed in the context of the temperature-anisotropy-driven instabilities with the effect of alpha particles.

关键词： (Sun)solar wind-instabilities-waves

Sediment supply mechanism and its influence on hydrocarbon accumulation in the Paleogene of the northern Huanghekou Sag,Bohai Bay Basin,China

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Journal of Palaeogeography 2023年第2期12卷 229-245页

作者： hai-feng yang Geng Qian Meng Zhao Yan-Fei Gao Wen Su Yao-Hui Xu China National Offshore Oil Corporation Tianjin Branch Tianjin300450China

Tectonic activity and sediment supply have significantly affected the rifted basin fillings and hydrocarbon *** Huanghekou Sag in the southeastern Bohai Bay Basin is a hydrocarbon rich sag and was bounded by the Bonan Uplift to the north in the Paleogene,which strongly affected sediment disribution and hydrocarbon accumulation in this *** sediment supply mechanism of the Paleogene parent rocks in this area has not been revealed ***,the Huanghekou Sag is a natural laboratory to reveal the relationship between the tectonic activties and hydrcoarbon accumulations in a rifted *** this study,the tectonic evolution characteristics of the Bonan Uplift in different geological periods are revealed during the main fault depression ***,the direction of the provenance and distribution of the depositional system of the Bonan Uplift are analyzed based on the sedimentary system and mineralogy ***,the sediment supply in the Bonan Uplift in different geological periods has been systematically *** results indicated that sediment supply is the dominant factor of hydrocarbon accumulation in the Paleogene in the Huanghekou *** the Paleocene-Middle Eocene,extensive denudation occurred in the Bonan Uplift,sediments were mainly sourced from the Bonan Uplift in the northern margin of the Huanghekou *** the Late Eocene to Early Oligocene,the Bonan Uplift had a large angle rotation and subsidence due to the strong rifting of the Bozhong Sag in the north,and the sand supply capacity was seriously *** to the different sediment supply in different geological periods,high quality reservoir and cap conditions were formed in the Paleogene in the central and northern parts of the Huanghekou Sag,which is conducive to the accumulation and preservation of oil and gas.

关键词： Huanghekou Sag Tectonic evolution Fault depression period Recovery of parent rock area Reservoir-cap combination

Mesh‑free semi‑quantitative variance underestimation elimination method in Monte Caro algorithm

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Nuclear Science and Techniques 2023年第1期34卷 157-171页

作者： Peng‑Fei Shen Xiao‑Dong Huo Ze‑Guang Li Zeng Shao hai‑feng yang Peng Zhang Kan Wang Department of Engineering Physics Tsinghua UniversityBeijing 100084China China Nuclear Power Engineering Corporation Beijing 100840China

The inter-cycle correlation of fission source distributions(FSDs)in the Monte Carlo power iteration process results in variance underestimation of tallied physical quantities,especially in large local *** study provides a mesh-free semiquantitative variance underestimation elimination method to obtain a credible confidence interval for the tallied *** method comprises two procedures:Estimation and *** FSD inter-cycle correlation length is estimated in the Estimation procedure using the Sliced Wasserstein distance *** batch method was then used in the elimination *** FSD inter-cycle correlation length was proved to be the optimum batch length to eliminate the variance underestimation *** exemplified this method using the OECD sphere array model and 3D PWR BEAVRS *** results showed that the average variance underestimation ratios of local tallies declined from 37 to 87%to within±5%in these models.

关键词： Monte Carlo algorithm Power iteration process Inter-cycle correlation Variance underestimation Sliced Wasserstein distance

Stellar spectra association rule mining method based on the weighted frequent pattern tree

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Research in Astronomy and Astrophysics 2013年第3期13卷 334-342页

作者： Jiang-Hui Cai Xu-Jun Zhao Shi-Wei Sun Ji-Fu Zhang hai-feng yang School of Computer Science and Technology Taiyuan University of Science and Technology National Astronomical Observatories Chinese Academy of Sciences

Effective extraction of data association rules can provide a reliable basis for classification of stellar spectra. The concept of stellar spectrum weighted itemsets and stellar spectrum weighted association rules are introduced, and the weight of a single property in the stellar spectrum is determined by information entropy. On that basis, a method is presented to mine the association rules of a stellar spectrum based on the weighted frequent pattern tree. Important properties of the spectral line are highlighted using this method. At the same time, the waveform of the whole spectrum is taken into account. The experimental results show that the data association rules of a stellar spectrum mined with this method are consistent with the main features of stellar spectral types.

关键词： methods: data analysis -- stars: fundamental parameters -- techniques:spectroscopic -- astronomical data bases: miscellaneous

An in-depth Exploration of LAMOST Unknown Spectra Based on Density Clustering

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Research in Astronomy and Astrophysics 2023年第5期23卷 52-65页

作者： hai-feng yang Xiao-Na Yin Jiang-Hui Cai Yu-Qing yang A-Li Luo Zhong-Rui Bai Li-Chan Zhou Xu-Jun Zhao Ya-Ling Xun Shanxi Key Laboratory of Big Data Analysis and Parallel Computing Taiyuan University of Science and TechnologyTaiyuan 030024China School of Computer Science and Technology Taiyuan University of Science and TechnologyTaiyuan 030024China School of Computer Science and Technology North University of ChinaTaiyuan 030051China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Large sky Area Multi-Object fiber Spectroscopic Telescope(LAMOST) has completed the observation of nearly 20 million celestial objects,including a class of spectra labeled “Unknown.” Besides low signal-to-noise ratio,these spectra often show some anomalous features that do not work well with current *** this paper,a total of 637,889 “Unknown” spectra from LAMOST DR5 are selected,and an unsupervised-based analytical framework of “Unknown” spectra named SA-Frame(Spectra Analysis-Frame) is provided to explore their origins from different *** SA-Frame is composed of three parts:NAPC-Spec clustering,characterization and origin ***,NAPC-Spec(Nonparametric density clustering algorithm for spectra) characterizes different features in the “unknown” spectrum by adjusting the influence space and divergence distance to minimize the effects of noise and high dimensionality,resulting in 13 ***,characteristic extraction and representation of clustering results are carried out based on spectral lines and continuum,where these 13 types are characterized as regular spectra with low S/Ns,splicing problems,suspected galactic emission signals,contamination from city light and un-gregarious type ***,a preliminary analysis of their origins is made from the characteristics of the observational targets,contamination from the sky,and the working status of the *** results would be valuable for improving the overall data quality of large-scale spectral surveys.

关键词： methods data analysis-surveys-techniques spectroscopic-site testing-methods analytical

A sample of galaxy pairs identified from the LAMOST spectral survey and the Sloan Digital Sky Survey

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Research in Astronomy and Astrophysics 2016年第3期16卷 63-72页

作者： Shi-Yin Shen Maria Argudo-Femandez Li Chen Xiao-Yan Chen Shuai feng Jin-Liang Hou Yong-Hui Hou Peng Jiang Yi-Peng Jing Xu Kong A-Li Luo Zhi-Jian Luo Zheng-Yi Shao Ting-Gui Wang Wen-Ting Wang Yue-Fei Wang Hong Wu Xue-Bing Wu hai-feng yang Ming yang Fang-Ting Yuan hai-Long Yuan Hao-Tong Zhang Jian-Nan Zhang Yong Zhang Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Key Lab for Astrophysics Shanghai 200234China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China University of Chinese Academy of Sciences Beijing 100049China Nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China University of Science and Technology of China Hefei 230026China Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute for Computational Cosmology University of DurhamSouth RoadDurhamDH1 3LEUK Department of Astronomy Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

A small fraction （〈 10%） of the SDSS main galaxy （MG） sample has not been targeted with spectroscopy due to the effect of fiber collisions. These galaxies have been compiled into the input catalog of the LAMOST ExtraGAlactic Surveys and named the complementary galaxy sample. In this paper, we introduce this project and status of the spectroscopies associated with the complementary galaxies in the first two years of the LAMOST spectral survey （till Sep. of 2014）. Moreover, we present a sample of 1102 galaxy pairs identified from the LAMOST complementary galaxies and SDSS MGs, which are defined as two members that have a projected distance smaller than 100 h^-01kpc and a recessional velocity difference smaller than 500 km s-1. Compared with galaxy pairs that are only selected from SDSS, the LAMOST- SDSS pairs have the advantages of not being biased toward large separations and therefore act as a useful supplement in statistical studies of galaxy interaction and galaxy merging.

关键词： galaxies: interactions -- galaxies: groups: general

A catalog of early-type emission-line stars and Hα line profiles from LAMOST DR2

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Research in Astronomy and Astrophysics 2016年第9期16卷 39-50页

作者： Wen Hou A-Li Luo Jing-Yao Hu hai-feng yang Chang-De Du Chao Liu Chien-De Lee Chien-Cheng Lin Yue-Fei Wang Yong Zhang Zi-Huang Cao Yong-Hui Hou Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China University of Chinese Academy of Sciences Beijing 100049 China School of Computer Science and Technology Taiyuan University of Science and Technology Taiyuan 030024 China Institute of Astronomy National Central University Jhongli Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Nanjing Institute of Astronomical Optics & Technology National Astronomical Observatories Chinese Academy of Sciences Nanjing 210042 China

We present a catalog including 11 204 spectra of 10436 early-type emission-line stars from LAMOST DR2, among which 9752 early-type emission-line spectra are newly discovered. For these early- type emissionqine stars, we discuss the morphological and physical properties of their low-resolution spectra. In this spectral sample, the Hα emission profiles display a wide variety of shapes. Based on the Hα line profiles, these spectra are categorized into five distinct classes： single-peak emission, single-peak emission in absorption, double-peak emission, double-peak emission in absorption, and P-Cygni profiles. To better understand what causes the Hc~ line profiles, we divide these objects into four types from the perspective of physical classification, which include classical Be stars, Herbig Ae/Be stars, close binaries and spectra contaminated by H n regions. The majority of Herbig Ae/Be stars and classical Be stars are identified and separated using a （H-K, K-W1） color-color diagram. We also discuss 31 binary systems that are listed in the SIMBAD on-line catalog and identify 3600 spectra contaminated by HⅡ regions after cross-matching with positions in the Dubout-Crillon catalog. A statistical analysis of line profiles versus classifications is then conducted in order to understand the distribution of Hc~ profiles for each type in our sample. Finally, we also provide a table of 172 spectra with Fen emission lines and roughly calculate stellar wind velocities for seven spectra with P-Cygni profiles.

关键词： stars early-type - stars emission-line, Be -- stars pre-main sequence -- binaries close

A sample of E+A galaxy candidates in the Second Data Release of LAMOST Survey

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Research in Astronomy and Astrophysics 2015年第8期15卷 1414-1423页

作者： hai-feng yang A-Li Luo Xiao-Yan Chen Wen Hou Jian-Nan Zhang Wei Du Ji-Fu Zhang Jiang-Hui Cai Yan-Xin Guo Shuo Zhang Yong-Heng Zhao Hong Wu Ting-Gui Wang Shi-Yin Shen Ming yang Yong Zhang Yong-Hui Hou Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences School of Computer Science and Technology Taiyuan University of Science and Technology University of Chinese Academy of Sciences Center for Astrophysics University of Science & Technology of China Shanghai Astronomical Observatory Chinese Academy of Sciences Nanjing Institute of Astronomical Optics & Technology National Astronomical ObservatoriesChinese Academy of Sciences

A sample of 70 E＋A galaxies is selected from 37 206 galaxies in the second data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope（LAMOST）. This sample is selected according to the criteria for E＋A galaxies defined by Goto, and each of these objects is further visually identified. In this sample, most objects are low redshift E＋A galaxies with z 〈 0.25, and are located in an area of the sky with high Galactic latitude and magnitude from 14 to 18 mag in the g, r and i bands. A stellar population analysis of the whole sample indicates that the E＋A galaxies are characterized by both young and old stellar populations（SPs）, and the metalrich SPs have relatively higher contributions than the metal-poor ones. Additionally, a morphological classification of these objects is performed based on images taken from the Sloan Digital Sky Survey.

关键词： galaxies: evolution—galaxies: formation—galaxies: interactions—galaxies: peculiar—galaxies: starburst