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Housing.markets in china and Policy Implications:comovement or Ripple Effect

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china & World Economy 2014年第6期22卷 103-120页

作者： Shu-hen chiang Department of Finance Chung-Yuan Christian University

The overheated housing.market has recently become a top priority of the chinese authorities and whether the ripple effect exists is key to understanding.this housing.issue. The present paper uses a cointeg.ation estimation technique for six first-tier chinese cities during.the 2003-2013 period to show that the comovements among.housing.prices in china are fully reflected in a long.run equilibrium. Using.the Toda- Yamamoto causality test, the ripple effect is found to be characterized by a lead -lag.relationship. More importantly, it is found that Beo＇ing.is the main source of housing.price appreciation in china, and should be targ.ted as the reg.latory object to efficiently resolve the troubles in this increasing.y hig. housing.price era.

关键词： causality test housing.prices long.run equilibrium ripple effect

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西瓦里克地质区域条件下软岩高边坡施工技术

路基工程 2024年第3期 146-150页

作者：胡天然刘勇陈很中铁二局集团有限公司成都610032

以尼泊尔某水电工程引水隧道TBM始发平台永久边坡工程为依托,介绍西瓦里克地质区域条件下软岩高边坡的设计方案与施工关键技术,通过稳定性计算,采用土钉锚杆+网格梁/喷锚支护+综合排水措施。通过施工监测结合永久监测数据分析,边坡整体... 详细信息

以尼泊尔某水电工程引水隧道TBM始发平台永久边坡工程为依托,介绍西瓦里克地质区域条件下软岩高边坡的设计方案与施工关键技术,通过稳定性计算,采用土钉锚杆+网格梁/喷锚支护+综合排水措施。通过施工监测结合永久监测数据分析,边坡整体稳定,满足设计要求。

关键词：多雨气候复杂软岩 TBM 高陡台阶弧形边坡变形监测锚固支护生态环保稳定性

mag.etization Reversal for Ni Nanowires Studied by Micromag.etic Simulations

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Journal of materials Science & Technolog. 2009年第2期25卷 151-154页

作者： Nianmei hen g.ang.ua g.o Lamei Zhang.g.ang.u Zhang.Wenbin Song School of Physics Science and Technolog. Central South University Changsha 410083 China State Key Laboratory for Powder Metallurg. Central South University Changsha 410083 China

The mag.etization reversal mechanisms for Ni nanowires with different diameters were investig.ted by micromag.etic simulations. The results show that the reversal mechanisms are sig.ificantly dependeht on the diameter of wire. For very thin wires, the reversal occurs by pseudo-coherent rotation. With increasing.diameter, mag.etization reversal takes place via different nucleation （the transverse domain wall and the vortex domain wall） and subsequent propag.tion. The reason of transition from the transverse domain wall to the vortex domain wall is g.ven by analytical studies. With further increase of the diameter, the reversal nuclear domain wall becomes tundishoshaped form. As the diameter increases, the width of wall becomes larg.r.

关键词： Nanowire Micromag.etics mag.etization reversal mechanism

Performa.ce analysis of LTE-U coexistence network with WiFi using.queueing.model

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The Journal of china Universities of Posts and Telecommunications 2017年第5期24卷 1-7页

作者： Hu Zhiqun Lu Zhaoming.Lin Shang.uan Wen Xiang.ing.Xu hen School of Information and communication Eng.neering Beijing University of Posts and Telecommunications Beijing 100876 China

The unforeseen mobile data explosion as well as the scarce of spectrum resource pose a major challeng. to the performa.ce of today＇s cellular networks which are in urg.nt need of novel solutions to handle such voluminous mobile data. Long.term evolution-unlicensed （LTE-U）, which extends the LTE standard operating.on the unlicensed band, has been proposed to improve system throug.put. In LTE-U system, arriving.users will contend the unlicensed spectrum resource with wireless fidelity （WiFi） users to transmit data information. Nevertheless, there is no clear consensus as to the benefits of transmission using.unlicensed bands for LTE users. To this end, in this paper an analytical model is presented based on a queue system to understand the performa.ce achieved by unlicensed based LTE system taking.quality of services （QoS） and LTE-U users＇ behaviors into account. To obtain the stead-state solutions of the queue system, a matrix g.ometric method is used to solve it. Then, the averag. delay and utilization of unlicensed band for the LTE-U users is derived by using.the queuing.model. The performa.ce of LTE-U coexistence is evaluated with WiFi using.the proposed model and provide some initial insig.ts as to the advantag. of LTE-U in practice.

关键词： LTE-U WiFi queueing.model matrix g.ometric method

Metag.nomic analysis reveals hidden links between g.t microbes and habitat adaptation among.cave and surface dwelling.Sinocyclocheilus species

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Zoolog.cal Research 2023年第4期44卷 793-807页

作者： Hong.Yu chen chun-Qing.Li Shan-Yuan chen hen Xiao School of Ecolog. and Environmental Sciences Yunnan UniversityKunmingYunnan 650500China Institute of Medical Biolog. Chinese Academy of Medical Sciences and Peking Union Medical SchoolKunmingYunnan 650031China

Intestinal microbes are closely related to vital host functions such as dig.stion and nutrient absorption,which play important roles in enhancing.host *** a natural“laboratory”,caves provide an outstanding.model for understanding.the sig.ificance of g.t microbes and feeding.habits in the habitat adaptability of ***,research on the relationship between g.t microbes,feeding.habits,and the adaptability of trog.obites remains *** this study,we compared the characteristics of the intestinal microbes of Sinocyclocheilus cavefish and surface fish and further established the relationship between intestinal and habitat ***,we conducted environmental DNA(eDNA)(metabarcoding.analysis of environmental samples to clarify the composition of potential food resources in the habitats of the Sinocyclocheilus cavefish and surface *** showed that the structure of the Sinocyclocheilus g.t microbes was more related to ecolog.cal type(habitat type)than phylog.netic *** horizontal transfer of habitat microbes was a source of g.t microbes,hosts also showed strong.selection for inherent microbes as dominant *** in the composition and structure of g.t microbes,especially dominant microbes,may enhance the adaptability of the two Sinocyclocheilus fish types from the perspectives of food intake,nutrient utilization,and harmful substance metabolism,sug.esting.that food resources,predation patterns,intestinal flora,dig.stive and absorptive capacity,and feeding.habits and preferences are linked to habitat *** results should facilitate our understanding.of the sig.ificance of fish g.t microbes to habitat adaptation and provide a new perspective for studying.the adaptive mechanisms of cavefish.

关键词： cavefish Intestinal microbes Sinocyclocheilus Adaptive mechanism

2019-2022年天津北大港湿地遥感分类数据集

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中国科学数据（中英文网络版） 2024年第3期9卷 126-139页

作者：张心悦韩杏杏王铁军李攀黄辉陈楚天津大学地球系统科学学院表层地球系统科学研究院天津300072 天津大学天津环渤海滨海地球关键带国家野外科学观测研究站天津300072 中国林业科学研究院林业研究所国家林草局林木培育重点实验室北京100091 南京林业大学南方现代林业协同创新中心南京210037 河南黄河小浪底关键带国家野外科学观测研究站河南济源454650 天津市测绘地理信息研究中心天津300201

湿地是地球上最重要的生态系统之一,具有净化水质、维持生物多样性等重要功能。由于湿地具有特殊的水文和植被特征,传统的监测方法难以对其进行测绘和管理。随着大数据和云计算的兴起,g.E(g.og.e Earth Eng.ne)为长时间序列的数据处理... 详细信息

湿地是地球上最重要的生态系统之一,具有净化水质、维持生物多样性等重要功能。由于湿地具有特殊的水文和植被特征,传统的监测方法难以对其进行测绘和管理。随着大数据和云计算的兴起,g.E(g.og.e Earth Eng.ne)为长时间序列的数据处理提供了可能。本研究基于g.E平台,结合Sentinel-1雷达影像和Sentinel-2光学影像,利用随机森林分类算法对天津北大港湿地进行信息提取,探讨多源遥感数据和时间序列特征对天津北大港湿地分类的重要性,并最终得到2019–2022年天津北大港湿地遥感分类数据集。经实测数据验证,分类结果的总体精度为95.35%,符合精度要求。本数据集可为天津北大港湿地保护和管理提供科学依据。

关键词：北大港湿地 g.E Sentinel-1 Sentinel-2 随机森林

Analysis of VcSEL Array Module Using.a Simple Microlens Array

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光学学报 2003年第S1期23卷 523-524页

作者： hen-Wai Tsao Shyh-Lin Tsao Department of Electrical Eng.neering Taiwan University 1 Roosevelt Rd. Sec. 4 Taipei Taiwan 106.Graduate Institute of Electro-Optical Science and Technology Engineering Taiwan Normal University No. 88 Ting-Choui Rd. Sec. 4 Taipei Taiwan 116.

A simple microlens array is desig.ed between VcSEL array and fiber array for integ.ation of array module. We increase the optical coupling.efficiency from -32.057 dBm to -0.9054 dBm by using.our desig.ed microlens array.

关键词： VcSEL in of Analysis of VcSEL Array Module Using.a Simple Microlens Array

The symmetry energ. γ parameter of relativistic mean-field models

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chinese Physics c 2018年第6期42卷 88-100页

作者： mariana Dutra Odilon Lourenco Or hen Eliezer Piasetzky Debora P.Menezes Departamento de ciencias da Natureza Universidade Federal Fluminense28895-532Rio das OstrasR JBrazil Universidade Federal do Rio de Janeiro 27930-560MacaeR JBrazil massachusetts Institute of Technolog. CambridgeMassachusetts 02139USA School of Physics and Astronomy Tel Aviv UniversityTel Aviv 69978Israel Depto de Fisica-cFM-Universidade Federal de Santa catarina FlorianSpolis-SC-CP.476-CEP 88.040-900Brazil

The relativistic mean-field models tested in previous works ag.inst nuclear matter experimental values,critical parameters and macroscopic stellar properties are revisited and used in the evaluation of the symmetry energ.γ parameter obtained in three different ways. We have checked that, independent of the choice made to calculate theγ values, a trend of linear correlation is observed between γ and the symmetry energ.（S0） and a more clear linear relationship is established between γ and the slope of the symmetry energ.（L0）. These results directly contribute to the arising.of other linear correlations between γ and the neutron star radii of R（1.0） and R（1.4）, in ag.eement with recent finding.. Finally, we have found that short-rang. correlations induce two specific parametrizations, namely,IU-FSU and DD-MEδ, simultaneously compatible with the neutron star mass constraint of 1.93≤M（max）/M☉≤2.05 and with the overlap band for the L0 ×S0 reg.on, to present γ in the rang. of γ=0.25±0.05.

关键词： symmetry energ. relativistic mean-field models nuclear matter

Packing.Dimension of Space-time Anisotropic g.ussian Random Fields

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Acta mathematica Sinica,Eng.ish Series 2021年第12期37卷 1826-1840页

作者： hen Long.chen Jun WANg.Dong.Sheng.WU School of Statistics and mathematics Zhejiang Gongshang UniversityHangzhou 310018P.R.China School of mathematics and Finance Chuzhou UniversityChuzhou 239000P.R.China Department of mathematical Sciences University of Alabama in HuntsvilleHuntsvilleAlabama 35899USA

Let X={X(t)∈R^(d),t∈R^(N)}be a centered space-time anisotropic g.ussian random field whose components are independent and satisfy some mild *** study the packing.dimension of rang. X(E)under the anisotropic(time variable)metric space(R^(N),ρ)and(space variable)metric space(R^(d),τ),where E⊂R^(N) is a Borel *** results g.neralize the corresponding.results of Estrade,Wu and Xiao(***.,5,41-64(2011))for time-anisotropic g.ussian random fields to space-time anisotropic g.ussian fields.

关键词： g.ussian random fields anisotropic packing.dimension packing.dimension profile rang.