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地区差距与中国居民收入差距(2002-2013)

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产业经济评论 2018年第3期 35-53页

作者：罗楚亮曹思未北京师范大学经济与工商管理学院中国收入分配研究院北京师范大学经济与工商管理学院

本文根据中国居民收入分配课题组(CHIP)最近三轮的住户调查数据,利用G·Fields分解和无条件分位回归分解,讨论了城乡差距和区域差距在全国收入差距及其变动方面的解释作用。2002年至2007年期间,居民收入差距继续扩大;2007年至2013年期间... 详细信息

本文根据中国居民收入分配课题组(CHIP)最近三轮的住户调查数据,利用G·Fields分解和无条件分位回归分解,讨论了城乡差距和区域差距在全国收入差距及其变动方面的解释作用。2002年至2007年期间,居民收入差距继续扩大;2007年至2013年期间,居民收入差距有所缩小。在这两种变化过程中,城乡(城镇-农村-流动人口)之间、区域(东中西部)之间的收入差距状况都具有非常重要的解释作用。从收入差距的内部结构来看,地区因素对于收入分布低分位点的收入增长具有重要解释作用,而教育特征对于高分位点的收入增长具有更高的解释份额;地区因素禀赋效应缩小了高端不平等(90与50分位点的对数收入差),但扩大了低端收入不平等(50与10分位点的对数收入差);两个时期中,教育状况都成为扩大低端不平等的因素。

关键词：收入差距地区差距 G·Fields分解无条件分位数回归

The Thickness of Some Complete Bipartite and Tripartite Graphs

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Acta Mathematicae Applicatae sinica 2024年第4期40卷 1001-1014页

作者： si-wei HU Yi-chao CHEN Yali Peicui School Changsha 410021China School of Mathematics Suzhou University of Science and TechnologySuzhou 215009China

In this paper,we obtain the thickness for some complete k-partite graphs for k=2,*** first compute the thickness of K_(n,n+8)by giving a planar decomposition of K_(4k-1,4k+7)for k≥***,two planar decompositions for K_(1,g,g)(g-1)when g is even and for K^(1,g,1/2(g-1)2)when g is odd are *** a recursive construction,we also obtain the thickness for some complete tripartite *** results here support the long-standing conjecture that the thickness of K_(m,n)is[mn/2(m+n-2)]for any positive integers m,n.

关键词： thickness complete bipartite graph complete tripartite graph planar decomposition

Unraveling brain aging through the lens of oral microbiota

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Neural Regeneration Research 2025年第7期20卷 1930-1943页

作者： Qinchao Hu si Wang weiqi Zhang Jing Qu Guang-Hui Liu State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijingChina Hospital of Stomatology Guanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Advanced Innovation Center for Human Brain Protection and National Clinical Research Center for Geriatric Disorders Xuanwu HospitalCapital Medical UniversityBeijingChina Aging Translational Medicine Center International Center for Aging and CancerBeijing Municipal Geriatric Medical Research CenterXuanwu HospitalCapital Medical UniversityBeijingChina CAS Key Laboratory of Genomic and Precision Medicine Beijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijingChina University of Chinese Academy of Sciences BeijingChina Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijingChina Aging Biomarker Consortium BeijingChina State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijingChina Beijing Institute for Stem Cell and Regenerative Medicine BeijingChina

The oral cavity is a complex physiological community encompassing a wide range of *** of oral microbiota can lead to various oral infectious diseases,such as periodontitis and tooth decay,and even affect systemic health,including brain aging and neurodegenerative *** studies have highlighted how oral microbes might be involved in brain aging and neurodegeneration,indicating potential avenues for intervention *** this review,we summarize clinical evidence demonstrating a link between oral microbes/oral infectious diseases and brain aging/neurodegenerative diseases,and dissect potential mechanisms by which oral microbes contribute to brain aging and *** also highlight advances in therapeutic development grounded in the realm of oral microbes,with the goal of advancing brain health and promoting healthy aging.

关键词： Alzheimer's disease brain aging multiple sclerosis neurodegeneration neurodegenerative diseases oral microbiota Parkinson's disease periodontitis bacteria Porphyromonas gingivalis

Challenges in the management of visual and tactile hallucinations in elderly people

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World Journal of Psychiatry 2025年第1期15卷 185-188页

作者： si-Sheng Huang Division of Geriatric Psychiatry Department of PsychiatryChanghua Christian HospitalChanghua 500Taiwan Department of Post-Baccalaureate Medicine College of MedicineNational Chung Hsing UniversityTaichung 402Taiwan

This letter provides a concise review of the pertinent literature on visual and tactile hallucinations in elderly *** discussion addresses differential diagnoses and potential underlying mechanisms,as well as the psychopathology associated with tactile hallucinations,and emphasizes the necessity for invest-igation into the possibility of coexisting delusional infestation(parasitosis).These symptoms frequently manifest in patients with primary psychotic disorders,organic mental disorders,and substance use *** proposed pathophy-siological mechanisms may involve dopaminergic imbalances and dysfunction of the striatal dopamine transporter.

关键词： Delusional infestation Dementia Haptic hallucination Scratching behavior Tactile hallucination Visual hallucination Alzheimer’s disease

Hydrogen production via catalytic decomposition of NH3 using promoted MgO-supported ruthenium catalysts

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Science China Chemistry 2019年第12期62卷 1625-1633页

作者： Xiu-Cui Hu wei-wei Wang Rui si chao Ma Chun-Jiang Jia Key Laboratory for Colloid and Interface Chemistry Key Laboratory of Special Aggregated MaterialsSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

Catalytic decomposition of NH3 to high purity hydrogen offers a promising strategy for fuel cells, but presents challenges for high hydrogen yields at comparatively low temperatures due to the lack of efficient catalysts. Here, we report the facile preparation of ultra-fine ruthenium（Ru） species dispersed on Mg O, which show excellent activity and high temperature stability for NH3 decomposition reaction. The hydrogen yield of the prepared Ru/Mg O catalysts reaches ca. 2,092 mmol H2 g–1 Ru min–1 at450 °C, far exceeding that of the previously reported most reactive Ru-based catalysts and the same chemical composition samples prepared by other approaches. Various characterization techniques containing X-ray absorption fine structure（XAFS）,in-situ diffuse reflectance infrared Fourier transform spectroscopy（in-situ DRTFTS） and temperature-programmed reduction/desorption（TPR/TPD） were carried out to explore the structure-function relation of the prepared Ru/Mg O catalysts. We found that the Ru species interact strongly with the Mg O support, which can efficiently protect the Ru species and Mg O support from agglomerating during NH3 decomposition test, maintaining the stability of the catalysts.

关键词： Ru catalyst MgO support ammonia decomposition hydrogen production structure-activity relation

Can an injection model replenish filaments in a weak magnetic environment?

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Research in Astronomy and Astrophysics 2019年第6期19卷 79-88页

作者： Peng Zou chao-wei Jiang Feng-si wei Wen-Da Cao Institute of Space Science and Applied Technology Harbin Institute of Technology Shenzhen 518055 China School of Astronomy & Space Science Nanjing University Nanjing 210023 China Big Bear Solar Observatory New Jersey Institute of Technology 40386 North Shore Lane Big Bear City CA 92314 USA

We observed an Hα surge that occurred in NOAA Active Region 12401 on 2015 August 17, and we discuss its trigger mechanism, and kinematic and thermal properties. It is suggested that this surge was caused by a chromospheric reconnection which ejected cool and dense material with transverse velocity of about 21–28 km s-1 and initial Doppler velocity of 12 km s^-1. This surge is similar to the injection of newly formed filament materials from their footpoints, except that the surge here occurred in a relatively weak magnetic environment of 100 G. Thus, we discuss the possibility of filament material replenishment via the erupting mass in such a weak magnetic field, which is often associated with quiescent filaments. It is found that the local plasma can be heated up to about 1.3 times the original temperature, which results in an acceleration of about –0.017 km s^-2. It can lift the dense material up to 10 Mm and higher with an inclination angle smaller than 50°, namely the typical height of active region filaments, but it can hardly inject the material up to those filaments higher than 25 Mm, like some quiescent filaments. Thus, we think that the injection model does not work well in describing the formation of quiescent filaments.

关键词： Sun activity-Sun chromosphere-Sun filaments,prominences

Dynamic process simulation with a Savage-Hutter type model for the intrusion of landslide into river

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Journal of Mountain Science 2016年第7期13卷 1265-1274页

作者： LIU wei He si-ming Ou Yang chao-jun Key laboratory of Mountain Hazards and Surface Process Chinese Academy of Science Institute of Mountain Hazards and Environment Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences

Natural damming of rivers by mass movements is a very common and potentially dangerous phenomena which has been documented all over the world. In this paper, a two-layer model of Savage-Hutter type is presented to simulate the dynamic procedure for the intrusion of landslide into rivers. The two-layer shallow water system is derived by depth averaging the incompressible Navier-Stokes equations with the hydrostatic assumption. A high order accuracy scheme based on the finite volume method is proposed to solve the presented model equations. Several numerical tests are performed to verify the realiability and feasibility of the proposed model. The numerical results indicate that the proposed method can be competent for simulating the dynamic process of landslide intrusion into the river. The interaction effect between both layers has a significant impact on the landslide movement, water fluctuation and wave propagation.

关键词： Landslide Two-layer model Savage Hutter type Numerical simulation

Enhancement of comprehensive properties of Nb-si based in-situ composites by Ho rare earth doping

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Rare Metals 2024年第9期43卷 4508-4520页

作者： wei wei Qi Wang Rui-Run Chen chao-Wen Zheng Yan-Qing Su National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

This study examines the microstructure,mechanical properties(with a focus on room-temperature toughness),and oxidation resistance of Ho-doped NbDsi based in-situ *** base alloy consists of the coarse primary Nb_(5)si_(3)phase and the Nb_(5)si_(3)+Nbss(Nb solid solution)eutectic *** doping influences the solidification *** the Ho doping is higher than0.2 at%,the alloys transform into eutectic *** can be solid-solved in trace amounts in the Nbss ***,most of Ho forms a stable Ho oxide phase,which alleviates oxygen contamination problem to some ***,the interface separation between Ho oxide and other phases reduces the plastic deformation ***,with 0.4 at%Ho doping,the K_(Q)value is18.03 MPa·m^(1/2),which is 31.1%higher than that of the base *** strength of the Ho-doped alloys does not deteriorate with an increase in ***,the large network-like Ho_(2)O_(3)in the 0.8Ho alloy causes a decrease in toughness and *** addition,the Ho oxide phase effectively blocks the inward oxygen *** 0.8 at%Ho doping,the oxidation mass gain per unit area is 10.16 mg·cm^(2),which is 39.7%lower than that of the base alloy.

关键词： Nb-si based composites Rare earth elements Ho Microstructure Properties

Influence of Ce and Mn addition on α-Fe morphology in recycled Al-si alloy ingots

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International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 890-895页

作者： chao Fan si-yuan Long Huai-de Yang Xiang-jie Wang Jun-cheng Zhang College of Materials Science and Engineering Chongqing University Engineering Training Center Guangxi University of Science and Technology

The influence of Ce or Ce and Mn combined additions on the morphology of a-Fe phases in recycled Alosi alloys was experimentally investigated by microstructure observation and room temperature tensile testing. It is found that Ce modifies the morphology of a-Fe phase from the large Chinese script-like into the individual and fine nodular shape. A combined addition of Ce and Mn results in the promotion of primary a-Fe formation, and their size increases considerably with the increase in Ce content. The mechanism of the above morphological changes was discussed in accordance with the nucleation and growth of a-Fe phase during solidification.

关键词： aluminum-silicon alloys cerium manganese modification morphology