理学—物理

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基于农田土壤的超声波传播特性试验
《农机化研究》2019年第8期175-179,185共6页宋堃 赵祚喜 马昆鹏 冯荣 蒙邵洋 杨贻勇 
国家重点研发计划项目(2016YFD0700101);广东省重点项目(2016KZDXM027)
超声波作为一种可靠的无损检测技术,是实现精准农业的重要手段。农田环境可能存在着小石块等异物,研究超声波在含石土壤中的传播特性有助于实现农田环境的精准监控。为此,以Biot模型为基础,建立了非饱和土壤环境下超声波的传播模型,并...
关键词:农田土壤 超声波 传播特性 无损检测 
Performance of the Wind Farm Parameterization Scheme Coupled with the Weather Research and Forecasting Model under Multiple Resolution Regimes for Simulating an Onshore Wind Farm
《大气科学进展:英文版》2019年第2期119-132,共14页Rajabu J.MANGARA Zhenhai GUO Shuanglin LI 
We use theWind Farm Parameterization(WFP)scheme coupled with theWeather Research and Forecasting model under multiple resolution regimes to simulate turbulent wake dynamics generated by a real onshore wind farm and th...
关键词:UPSTREAM DOWNSTREAM WIND FARM impact WIND FARM PARAMETERIZATION scheme WAKE flow dynamics 
Impact of the Horizontal Heat Flux in the Mixed Layer on an Extreme Heat Event in North China:A Case Study
《大气科学进展:英文版》2019年第2期133-142,共10页Ying NA Riyu LU Bing LU Min CHEN Shiguang MIAO 
sponsored by the Ministry of Science and Technology of China(Grant No.2015DFA20870).
Extreme heat over the North China Plain is typically induced by anomalous descending flows associated with anticyclonic circulation anomalies.However,an extreme heat event that happened in the North China Plain region...
关键词:EXTREME HEAT North China PLAIN HORIZONTAL HEAT FLUX sensible HEAT FLUX WARM advection 
Warm-Season Diurnal Variations of Total,Stratiform,Convective,and Extreme Hourly Precipitation over Central and Eastern China
《大气科学进展:英文版》2019年第2期143-159,共17页Yongguang ZHENG Yanduo GONG Jiong CHEN Fuyou TIAN 
Diurnal variations in amount,frequency and intensity of warm-season hourly precipitation(HP)at seven levels,which are defined as HP>0:1,0.5,1,5,10,20 and 50 mm,are revealed based on no less than 30 years of hourly rai...
关键词:diurnal variation TOTAL PRECIPITATION STRATIFORM PRECIPITATION CONVECTIVE PRECIPITATION EXTREME PRECIPITATION 
Impact of the Assimilation Frequency of Radar Data with the ARPS 3DVar and Cloud Analysis System on Forecasts of a Squall Line in Southern China
《大气科学进展:英文版》2019年第2期160-172,共13页Yujie PAN Mingjun WANG 
Assimilation configurations have significant impacts on analysis results and subsequent forecasts.A squall line system that occurred on 23 April 2007 over southern China was used to investigate the impacts of the data...
关键词:cloud analysis RADAR DATA ASSIMILATION DATA ASSIMILATION INTERVAL 
Impacts of the Autumn Arctic Sea Ice on the Intraseasonal Reversal of the Winter Siberian High
《大气科学进展:英文版》2019年第2期173-188,共16页Zhuozhuo Lv Shengping HE Fei LI Huijun WANG 
During 1979–2015,the intensity of the Siberian high(SH)in November and December–January(DJ)is frequently shown to have an out-of-phase relationship,which is accompanied by opposite surface air temperature and circul...
关键词:Siberian high ARCTIC sea ice STORM TRACK phase REVERSAL 
土壤对管道纵模导波传播特性的影响
《河南科技大学学报:自然科学版》2019年第1期25-29,107,108共7页蔡海潮 尚振东 吕冠宇 
国家重大科技专项基金项目(2011ZX04014-081);河南省科技厅科技攻关基金项目(182102210299);河南省高校重点科研基金项目(18A460021)。
针对超声导波技术在不同地理环境下埋地管道的缺陷检测问题,对埋地管道中纵向模态的频散和衰减特性进行了分析。建立了埋地管道的三维有限元模型,分析了激励频率和土壤类型对纵模导波传播的影响。在埋地管道中粘贴压电陶瓷片激励和接...
关键词:管道 纵模导波 土壤类型 数值模拟 频率 衰减 
Satellite-based Observational Study of the Tibetan Plateau Vortex:Features of Deep Convective Cloud Tops
《大气科学进展:英文版》2019年第2期189-205,248共18页Yi-Xuan SHOU Feng LU Hui LIU Peng CUI Shaowen SHOU Jian LIU 
In this study,an east-moving Tibetan Plateau vortex(TPV)is analyzed by using the ERA-5 reanalysis and multi-source satellite data,including FengYun-2E,Aqua/MODIS and CALIPSO.The objective is to demonstrate:(i)the usef...
关键词:Tibetan Plateau VORTEX MULTI-SPECTRAL SATELLITE observations short-range/nowcasting weather forecasts cold U/V-shaped cloud top TROPOPAUSE folding 
Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea
《大气科学进展:英文版》2019年第2期219-230,共12页Xiangzhou SONG Rui Xin HUANG Dexing WU Fangli QIAO Guansuo WANG 
Horizontal velocity spirals with a clockwise rotation(downward looking)rate of 1.7°m^-1,on average,were observed in the western and northern Yellow Sea from December 2006 to February 2007.With the observed thermal wi...
关键词:geostrophic SPIRALS HORIZONTAL DIFFUSION VORTEX STRETCHING and surface cooling effect 
Ensemble Forecasts of Tropical Cyclone Track with Orthogonal Conditional Nonlinear Optimal Perturbations
《大气科学进展:英文版》2019年第2期231-247,共17页Zhenhua HUO Wansuo DUAN Feifan ZHOU 
This paper preliminarily investigates the application of the orthogonal conditional nonlinear optimal perturbations(CNOPs)–based ensemble forecast technique in MM5(Fifth-generation Pennsylvania State University–Nati...
关键词:ENSEMBLE FORECAST initial PERTURBATION CONDITIONAL nonlinear optimal PERTURBATION tropical CYCLONE 
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