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“风”和“wind”隐喻映射的文化透视对比 被引量:6
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作者 李耸 冯奇 《南昌大学学报(人文社会科学版)》 北大核心 2006年第4期157-160,共4页
隐喻是源域事物的部分特征向目标域映射的结果。它植根于文化世界的体验,受到文化的制约。不同的语言由于民族文化心理不同,对同一事物的隐喻映射既有联系又有差别。通过多角度对比分析“风”和“w ind”的隐喻映射,有利于揭示产生二者... 隐喻是源域事物的部分特征向目标域映射的结果。它植根于文化世界的体验,受到文化的制约。不同的语言由于民族文化心理不同,对同一事物的隐喻映射既有联系又有差别。通过多角度对比分析“风”和“w ind”的隐喻映射,有利于揭示产生二者异同的民族文化心理动因。 展开更多
关键词 “风” wind” 隐喻 映射 文化
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Analysis on formula principles for“head wind”disease based on apriori and clustering algorithm
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作者 Ji-Wei Lin Dong-Cai Wang +5 位作者 Hai-Bin Wu Yang-Hui Gu Xiao-Rong Song Bo-Min Cheng Jia-Hui Wang Ming-Zhen Xu 《Drug Combination Therapy》 2019年第2期56-64,共9页
Objective:To explore the formula principles for“head wind”disease by data-mining and provide reference for the treatment of“head wind”disease.Methods:Prescriptions for headache from“Dictionary of Traditional Chin... Objective:To explore the formula principles for“head wind”disease by data-mining and provide reference for the treatment of“head wind”disease.Methods:Prescriptions for headache from“Dictionary of Traditional Chinese Medicine Prescriptions”were collected,sorted and entered into the“Traditional Chinese Medicine Inheritance System”(V2.5)to analyze the composition principles by the methods of revised mutual information,complex system entropy cluster and unsupervised hierarchical cluster.Results:The herbs with high usage frequency in these prescriptions for“head wind”disease included Chuan-xiong,Bai-zhi,Xi-xin,Fang-feng,Gan-cao,Shi-Gao and Qiang-Huo.Three new prescriptions were obtained based on the composition principles and rules.The first new prescription is composed of Quan-xie,Xiong-huang,Jiang-can,Zhi-chuan-wu and Di-long.The second new prescription is composed of Du-huo,Rou-gui,Ku-shen;Fang-feng,Gao-ben,Qiang-huo.The third new prescription is composed of Fu-zi,Sheng-chuan-wu,Tian-nan-xing,Chuan-xiong,Bai-zhi,Shi-gao.Conclusion:We found that the most of herbs used to treat the“head wind”disease are warm and spicy,mainly belong to diaphoretic herbs,wind-expelling herbs,and dampness-dispelling herbs.In addition,the new prescriptions for infertility mainly focus on eliminating evil,with the characteristics of“eliminating phlegm and turbid”,“dredging the channels and collaterals”,“expelling wind-evil”and“promoting blood circulation”. 展开更多
关键词 “Head wind”disease FORMULA PRINCIPLES Traditional Chinese MEDICINE INHERITANCE Support System
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“East Wind”应为“Winter Wind”——关于《高级英语》一条注释的商榷
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作者 雷买利 《陕西教育学院学报》 2004年第2期99-101,共3页
《高级英语》第二册第十一课注释9中将"eastwind"解释为"万物苏复的春风",但无论是从英国地理环境,英国文学作品例证,还是该文作者本意来看,"东风"应被解释为"凛冽的冬风"。
关键词 《高级英语》 翻译 “冬风” “春风” “东风” 地理常识 文学表现
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雷诺概念车“Wind”
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《中国科技信息》 2004年第6期29-29,共1页
关键词 法国雷诺公司 wind”概念车 排量 轴距 设计
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MEANINGS AND STYLISTIC FEATURES OF“ODE TO THE WEST WIND” 被引量:1
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作者 顾嘉祖 《外国语言文学》 1987年第2期66-70,共5页
赫罗尔德·布卢姆在《雪莱的神话虚构》一书中说:“‘西风颂’在雪莱抒情诗中独占鳌头,它生动而简洁地概括了抒情体诗的精髓。”本文在剖析西风作用于枯叶、乱云和波浪的过程中指出:西风扮演护持者和破坏者的角色是贯穿全诗的两个主... 赫罗尔德·布卢姆在《雪莱的神话虚构》一书中说:“‘西风颂’在雪莱抒情诗中独占鳌头,它生动而简洁地概括了抒情体诗的精髓。”本文在剖析西风作用于枯叶、乱云和波浪的过程中指出:西风扮演护持者和破坏者的角色是贯穿全诗的两个主题,而 leaves 是连结全诗的链环。本文作者进而从 seeds 的基督形象、azure 的色彩含义、Maenad 的意象作用、西风的音响效果以及 seeds 与 words 的内在联系等方面作为布卢姆论断精辟的左证。 展开更多
关键词 WEST wind ODE TO THE WEST wind MEANINGS AND STYLISTIC FEATURES OF 布卢姆 西风
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Erratum to “Improving the Power Generation Performance of a Solar Tower Using Thermal Updraft Wind” [Energy and Power Engineering Vol. 6 No. 11 (October 2014) 362-370]
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作者 Masataka Motoyama Yuji Ohya +3 位作者 Takashi Karasudani Tomoyuki Nagai Shinsuke Okada Kenichiro Sugitani 《Energy and Power Engineering》 2015年第6期255-257,共3页
The original online version of this article (Masataka Motoyama, Kenichiro Sugitani, Yuji Ohya, et al. (2014) “Improving the Power Generation Performance of a Solar Tower Using Thermal Updraft Wind”, 2014, 6, 362-370... The original online version of this article (Masataka Motoyama, Kenichiro Sugitani, Yuji Ohya, et al. (2014) “Improving the Power Generation Performance of a Solar Tower Using Thermal Updraft Wind”, 2014, 6, 362-370. http://dx.doi.org/10.4236/epe.2014.611031) was published in October, 2014.The author wishes to correct the following error in text and Figures 9-11. 展开更多
关键词 Solar TOWER THERMAL UPDRAFT wind Turbine DIFFUSER
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Let the“East Wind” Blow Even Harder
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作者 Wang Zukang, Chairman of the Orient International (Holding) Co Ltd 《中国经贸画报》 1998年第1期94-94,共1页
The goal of the Orient International is to double the value of its assets and the scale of its business operations by the end of this century and enter into the world’s top 100 service companies. At the same time, it... The goal of the Orient International is to double the value of its assets and the scale of its business operations by the end of this century and enter into the world’s top 100 service companies. At the same time, it will create the framework of a business entity With comprehensive functions and acquire the operational basics of Such an eritity. 展开更多
关键词 East wind Blow Even Harder Let the
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Vertical gradients of neutral winds observed by ICON and estimated by the Horizontal Wind Model during the geomagnetic storm on August 26−28,2021
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作者 JiaWei Wu Chao Xiong +1 位作者 YuYang Huang YunLiang Zhou 《Earth and Planetary Physics》 EI CAS 2025年第1期69-80,共12页
The Michelson Interferometer for Global High-resolution Thermospheric Imaging(MIGHTI)onboard the Ionospheric Connection Explorer(ICON)satellite offers the opportunity to investigate the altitude profile of thermospher... The Michelson Interferometer for Global High-resolution Thermospheric Imaging(MIGHTI)onboard the Ionospheric Connection Explorer(ICON)satellite offers the opportunity to investigate the altitude profile of thermospheric winds.In this study,we used the red-line measurements of MIGHTI to compare with the results estimated by Horizontal Wind Model 14(HWM14).The data selected included both the geomagnetic quiet period(December 2019 to August 2022)and the geomagnetic storm on August 26-28,2021.During the geomagnetic quiet period,the estimations of neutral winds from HWM14 showed relatively good agreement with the observations from ICON.According to the ICON observations,near the equator,zonal winds reverse from westward to eastward at around 06:00 local time(LT)at higher altitudes,and the stronger westward winds appear at later LTs at lower altitudes.At around 16:00 LT,eastward winds at 300 km reverse to westward,and vertical gradients of zonal winds similar to those at sunrise hours can be observed.In the middle latitudes,zonal winds reverse about 2-4 h earlier.Meridional winds vary more significantly than zonal winds with seasonal and latitudinal variations.According to the ICON observations,in the northern low latitudes,vertical reversals of meridional winds are found at 08:00-13:00 LT from 300 to 160 km and at around 18:00 LT from 300 to 200 km during the June solstice.Similar reversals of meridional winds are found at 04:00-07:00 LT from 300 to 160 km and at 22:00-02:00 LT from 270 to 200 km during the December solstice.In the southern low latitudes,meridional wind reversals occur at 08:00-11:00 LT from 200 to 160 km and at 21:00-02:00 LT from 300 to 200 km during the June solstice.During the December solstice,reversals of the meridional wind appear at 20:00-01:00 LT below 200 km and at 06:00-11:00 LT from 300 to 160 km.In the northern middle latitudes,the northward winds are dominant at 08:00-14:00 LT at 230 km during the June solstice.Northward winds persist until 16:00 LT at 160 and 300 km.During the December solstice,the northward winds are dominant from 06:00 to 21:00 LT.The vertical variations in neutral winds during the geomagnetic storm on August 26-28 were analyzed in detail.Both meridional and zonal winds during the active geomagnetic period observed by ICON show distinguishable vertical shear structures at different stages of the storm.On the dayside,during the main phase,the peak velocities of westward winds extend from a higher altitude to a lower altitude,whereas during the recovery phase,the peak velocities of the westward winds extend from lower altitudes to higher altitudes.The velocities of the southward winds are stronger at lower altitudes during the storm.These vertical structures of horizontal winds during the storm could not be reproduced by the HWM14 wind estimations,and the overall response to the storm of the horizontal winds in the low and middle latitudes is underestimated by HWM14.The ICON observations provide a good dataset for improving the HWM wind estimations in the middle and upper atmosphere,especially the vertical variations. 展开更多
关键词 horizontal neutral winds vertical gradients Ionospheric Connection Explorer satellite Horizontal wind Model 14 geomagnetic storm
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Thermospheric neutral wind studies over the equatorial region:A review
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作者 Siti Syazwani Nasuha Idahwati Sarudin +1 位作者 Nurul Shazana Abdul Hamid Ahmad Fairuz Omar 《Earth and Planetary Physics》 EI CAS 2025年第1期81-100,共20页
Thermospheric neutral winds(TNWs)refer to the neutral gases in the thermosphere circulating as tides,which play a crucial role in the dynamics of the thermosphere-ionosphere system(TIS).Global geospace neutral winds,p... Thermospheric neutral winds(TNWs)refer to the neutral gases in the thermosphere circulating as tides,which play a crucial role in the dynamics of the thermosphere-ionosphere system(TIS).Global geospace neutral winds,particularly over the magnetic equator,have been a subject of study for several decades.However,despite the known importance of neutral winds,a comprehensive understanding and characterization of the winds is still lacking.Various ground-based and satellite missions have provided valuable information on the contribution of neutral winds to the global atmospheric dynamics.However,efforts in the global monitoring of neutral winds are still lacking,and the drivers behind the behavior of TNWs as well as their influence on the TIS remain incomplete.To address these knowledge gaps in the global circulation of TNWs,it is crucial to develop a deep understanding of the neutral wind characteristics over different regions.The low-latitude equatorial region in particular has been observed to exert complex influences on TNWs because of the unique effects of the Earth’s magnetic field at the dip equator.Studying neutral winds over this region will provide valuable insights into the unique dynamics and processes that occur in this region,thereby enhancing our understanding of their role in the overall dynamics of the TIS.Additionally,through empirical observations,an improved ability to accurately model and predict the behavior of this region can be achieved.This review article addresses challenges in understanding equatorial winds by reviewing historical measurements,current missions,and the interactions of ionospheric and thermospheric phenomena,emphasizing the need for comprehensive measurements to improve global atmospheric dynamics and weather forecasting. 展开更多
关键词 thermospheric neutral wind thermosphere-ionosphere system dip equator equatorial region
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An investigation on the wind profiles and gravity wave dynamics in MLT region based on the meteor radars from the Meridian Project
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作者 Tai Liu Zhe Wang +2 位作者 MengXi Shi Willie Soon ShiCan Qiu 《Earth and Planetary Physics》 EI CAS 2025年第1期29-38,共10页
The meteor radar can detect the zenith angle,azimuth,radial velocity,and altitude of meteor trails so that one can invert the wind profiles in the mesosphere and low thermosphere(MLT)region,based on the Interferometri... The meteor radar can detect the zenith angle,azimuth,radial velocity,and altitude of meteor trails so that one can invert the wind profiles in the mesosphere and low thermosphere(MLT)region,based on the Interferometric and Doppler techniques.In this paper,the horizontal wind field,gravity wave(GW)disturbance variance,and GW fluxes are analyzed through the meteor radar observation from 2012−2022,at Mohe(53.5°N,122.4°E)and Zuoling(30.5°N,114.6°E)stations of the(Chinese)Meridian Project.The Lomb−Scargle periodogram method has been utilized to analyze the periodic variations for time series with observational data gaps.The results show that the zonal winds at both stations are eastward dominated,while the meridional winds are southward dominated.The variance of GW disturbances in the zonal and meridional directions increases gradually with height,and there is a strong pattern of annual variation.The zonal momentum flux of GW changes little with height,showing weak annual variation.The meridional GW flux varies gradually from northward to southward with height,and the annual periodicity is stronger.For both stations,the maximum values of zonal and meridional wind occur close to the peak heights of GW flux,with opposite directions.This observational evidence is consistent with the filtering theory.The horizontal wind velocity,GW flux,and disturbance variance of the GW at Mohe are overall smaller than those at Zuoling,indicating weaker activities in the MLT at Mohe.The power spectral density(PSD)calculated by the Lomb−Scargle periodogram shows that there are 12-month period and 6-month period in horizontal wind field,GW disturbance variance and GW flux at both stations,and especially there is also a 4-month cycle in the disturbance variance.The PSD of the 12-month and 6-month cycles exhibits maximum values below 88 km and above 94 km. 展开更多
关键词 meteor radar wind field gravity wave Lomb−Scargle method
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Two methods for separating the magnetospheric solar wind charge exchange soft X-ray emission from the diffuse X-ray background 被引量:2
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作者 YingJie Zhang TianRan Sun +5 位作者 JenniferACarter WenHao Liu Steve Sembay ShuiNai Zhang Li Ji Chi Wang 《Earth and Planetary Physics》 EI CSCD 2024年第1期119-132,共14页
Solar wind charge exchange(SWCX)is the process of solar wind high-valence ions exchanging charges with neutral components and generating soft X-rays.Recently,detecting the SWCX emission from the magnetosphere is propo... Solar wind charge exchange(SWCX)is the process of solar wind high-valence ions exchanging charges with neutral components and generating soft X-rays.Recently,detecting the SWCX emission from the magnetosphere is proposed as a new technique to study the magnetosphere using panoramic soft X-ray imaging.To better prepare for the data analysis of upcoming magnetospheric soft X-ray imaging missions,this paper compares the magnetospheric SWCX emission obtained by two methods in an XMM-Newton observation,during which the solar wind changed dramatically.The two methods differ in the data used to fit the diffuse X-ray background(DXB)parameters in spectral analysis.The method adding data from the ROSAT All-Sky Survey(RASS)is called the RASS method.The method using the quiet observation data is called the Quiet method,where quiet observations usually refer to observations made by the same satellite with the same target but under weaker solar wind conditions.Results show that the spectral compositions of magnetospheric SWCX emission obtained by the two methods are very similar,and the changes in intensity over time are highly consistent,although the intensity obtained by the RASS method is about 2.68±0.56 keV cm^(-2)s^(-1)sr^(-1)higher than that obtained by the Quiet method.Since the DXB intensity obtained by the RASS method is about 2.84±0.74 keV cm^(-2)s^(-1)sr^(-1)lower than that obtained by the Quiet method,and the linear correlation coefficient between the difference of SWCX and DXB obtained by the two methods in diffe rent energy band is close to-1,the diffe rences in magnetospheric SWCX can be fully attributed to the diffe rences in the fitted DXB.The difference between the two methods is most significant when the energy is less than 0.7 keV,which is also the main energy band of SWCX emission.In addition,the difference between the two methods is not related to the SWCX intensity and,to some extent,to solar wind conditions,because SWCX intensity typically va ries with the solar wind.In summary,both methods are robust and reliable,and should be considered based on the best available options. 展开更多
关键词 solar wind charge exchange(SWCX) ROSAT All-Sky Survey(RASS) soft X-ray X-ray imaging MAGNETOSPHERE
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Solar wind ion charge state distributions and compound cross sections for solar wind charge exchange X-ray emission 被引量:1
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作者 Dimitra Koutroumpa 《Earth and Planetary Physics》 EI CSCD 2024年第1期105-118,共14页
Solar Wind Charge eXchange X-ray(SWCX) emission in the heliosphere and Ea rth’s exosphere is a hard to avoid signal in soft Xray obse rvations of astrophysical targets.On the other hand,the X-ray imaging possibilitie... Solar Wind Charge eXchange X-ray(SWCX) emission in the heliosphere and Ea rth’s exosphere is a hard to avoid signal in soft Xray obse rvations of astrophysical targets.On the other hand,the X-ray imaging possibilities offered by the SWCX process has led to an increasing number of future dedicated space missions for investigating the solar wind-terrestrial inte ractions and magnetospheric interfaces.In both cases,accurate modelling of the SWCX emission is key to correctly interpret its signal,and remove it from obse rvations,when needed.In this paper,we compile solar wind abundance measurements from ACE for different solar wind types,and atomic data from literature,including charge exchange cross-sections and emission probabilities,used fo r calculating the compound cross-section a for the SWCX X-ray emission.We calculate a values for charge-exchange with H and He,relevant to soft X-ray energy bands(0.1-2.0 keV)for various solar wind types and solar cycle conditions. 展开更多
关键词 solar wind charge exchange X-rays MAGNETOSPHERE HELIOSPHERE
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Five-phase Synchronous Reluctance Machines Equipped with a Novel Type of Fractional Slot Winding 被引量:1
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作者 S.M.Taghavi Araghi A.Kiyoumarsi B.Mirzaeian Dehkordi 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2024年第3期264-273,共10页
Multi-phase machines are so attractive for electrical machine designers because of their valuable advantages such as high reliability and fault tolerant ability.Meanwhile,fractional slot concentrated windings(FSCW)are... Multi-phase machines are so attractive for electrical machine designers because of their valuable advantages such as high reliability and fault tolerant ability.Meanwhile,fractional slot concentrated windings(FSCW)are well known because of short end winding length,simple structure,field weakening sufficiency,fault tolerant capability and higher slot fill factor.The five-phase machines equipped with FSCW,are very good candidates for the purpose of designing motors for high reliable applications,like electric cars,major transporting buses,high speed trains and massive trucks.But,in comparison to the general distributed windings,the FSCWs contain high magnetomotive force(MMF)space harmonic contents,which cause unwanted effects on the machine ability,such as localized iron saturation and core losses.This manuscript introduces several new five-phase fractional slot winding layouts,by the means of slot shifting concept in order to design the new types of synchronous reluctance motors(SynRels).In order to examine the proposed winding’s performances,three sample machines are designed as case studies,and analytical study and finite element analysis(FEA)is used for validation. 展开更多
关键词 Finite element analysis Five-phase machine Fractional slot concentrated winding(FSCW) Machine slot/pole combination MMF harmonics Synchronous reluctance machine winding factor
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U-Net Models for Representing Wind Stress Anomalies over the Tropical Pacific and Their Integrations with an Intermediate Coupled Model for ENSO Studies 被引量:1
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作者 Shuangying Du Rong-Hua Zhang 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第7期1403-1416,共14页
El Niño-Southern Oscillation(ENSO)is the strongest interannual climate mode influencing the coupled ocean-atmosphere system in the tropical Pacific,and numerous dynamical and statistical models have been develope... El Niño-Southern Oscillation(ENSO)is the strongest interannual climate mode influencing the coupled ocean-atmosphere system in the tropical Pacific,and numerous dynamical and statistical models have been developed to simulate and predict it.In some simplified coupled ocean-atmosphere models,the relationship between sea surface temperature(SST)anomalies and wind stress(τ)anomalies can be constructed by statistical methods,such as singular value decomposition(SVD).In recent years,the applications of artificial intelligence(AI)to climate modeling have shown promising prospects,and the integrations of AI-based models with dynamical models are active areas of research.This study constructs U-Net models for representing the relationship between SSTAs andτanomalies in the tropical Pacific;the UNet-derivedτmodel,denoted asτUNet,is then used to replace the original SVD-basedτmodel of an intermediate coupled model(ICM),forming a newly AI-integrated ICM,referred to as ICM-UNet.The simulation results obtained from ICM-UNet demonstrate their ability to represent the spatiotemporal variability of oceanic and atmospheric anomaly fields in the equatorial Pacific.In the ocean-only case study,theτUNet-derived wind stress anomaly fields are used to force the ocean component of the ICM,the results of which also indicate reasonable simulations of typical ENSO events.These results demonstrate the feasibility of integrating an AI-derived model with a physics-based dynamical model for ENSO modeling studies.Furthermore,the successful integration of the dynamical ocean models with the AI-based atmospheric wind model provides a novel approach to ocean-atmosphere interaction modeling studies. 展开更多
关键词 U-Net models wind stress anomalies ICM integration of AI and physical components
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Near-surface wind field characteristics of the desert-oasis transition zone in Dunhuang,China
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作者 PAN Jiapeng ZHANG Kecun +1 位作者 AN Zhishan ZHANG Yu 《Journal of Arid Land》 SCIE CSCD 2024年第5期654-667,共14页
The desert-oasis transition zone(DOTZ)serves as a buffer area between the desert and oasis.Understanding its wind field characteristics is of great significance for the prevention and control of aeolian disasters in t... The desert-oasis transition zone(DOTZ)serves as a buffer area between the desert and oasis.Understanding its wind field characteristics is of great significance for the prevention and control of aeolian disasters in the oasis.In this study,we used meteorological data during 2013–2019 from the portable meteorological stations at five sites(site A on the edge of the oasis,sites B,C,and D in the DOTZ,and site O in the desert)in Dunhuang,China to analyze the near-surface wind field characteristics and their causes,as well as to reveal the key role of the DOTZ in oasis protection.The results showed that the mean wind speed,frequency of sand-driving wind,and directional variability of wind decreased from west to east within the DOTZ,and wind speed was significantly affected by air temperature.The terrain influenced the prevailing winds in the region,mainly from northeast and southwest.Only some areas adjacent to the oasis were controlled by southeasterly wind.This indicated that the near-surface wind field characteristics of the DOTZ were caused by the combined effects of local terrain and surface hydrothermal difference.At site D,the annual drift potential(DP)was 24.95 vector units(VU),indicating a low wind energy environment,and the resultant drift direction(RDD)showed obvious seasonal differences.Additionally,the DOTZ played an important buffering role between the desert and oasis.Compared with the desert,the mean wind speed in the oasis decreased by 64.98%,and the prevailing wind direction was more concentrated.The results of this study will be useful in interpreting the aeolian activity of the DOTZ in Dunhuang. 展开更多
关键词 desert-oasis transition zone near-surface wind field hydrothermal difference sand-driving wind aeolian environment Dunhuang
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Effects of wind speed,underlying surface,and seed morphological traits on the secondary seed dispersal in the Tengger Desert,China
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作者 QU Wenjie ZHAO Wenzhi +3 位作者 YANG Xinguo WANG Lei ZHANG Xue QU Jianjun 《Journal of Arid Land》 SCIE CSCD 2024年第4期531-549,共19页
The maintenance of sand-fixing vegetation is important for the stability of artificial sand-fixing systems in which seed dispersal plays a key role.Based on field wind tunnel experiments using 11 common plant species ... The maintenance of sand-fixing vegetation is important for the stability of artificial sand-fixing systems in which seed dispersal plays a key role.Based on field wind tunnel experiments using 11 common plant species on the southeastern edge of the Tengger Desert,China,we studied the secondary seed dispersal in the fixed and semi-fixed sand dunes as well as in the mobile dunes in order to understand the limitations of vegetation regeneration and the maintenance of its stability.Our results indicated that there were significant variations among the selected 11 plant species in the threshold of wind speed(TWS).The TWS of Caragana korshinskii was the highest among the 11 plant species,whereas that of Echinops gmelinii was the lowest.Seed morphological traits and underlying surface could generally explain the TWS.During the secondary seed dispersal processes,the proportions of seeds that did not disperse(no dispersal)and only dispersed over short distance(short-distance dispersal within the wind tunnel test section)were significantly higher than those of seeds that were buried(including lost seeds)and dispersed over long distance(long-distance dispersal beyond the wind tunnel test section).Compared with other habitats,the mobile dunes were the most difficult places for secondary seed dispersal.Buried seeds were the easiest to be found in the semi-fixed sand dunes,whereas fixed sand dunes were the best sites for seeds that dispersed over long distance.The results of linear mixed models showed that after controlling the dispersal distance,smaller and rounder seeds dispersed farther.Shape index and wind speed were the two significant influencing factors on the burial of seeds.The explanatory power of wind speed,underlying surface,and seed morphological traits on the seeds that did not disperse and dispersed over short distance was far greater than that on the seeds that were buried and dispersed over long distance,implying that the processes and mechanisms of burial and long-distance dispersal are more complex.In summary,most seeds in the study area either did not move,were buried,or dispersed over short distance,promoting local vegetation regeneration. 展开更多
关键词 seed dispersal seed morphological traits wind speed vegetation regeneration wind tunnel Tengger Desert
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A nonlinear wake model of a wind turbine considering the yaw wake steering
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作者 Yunzhou LI Zhiteng GAO +2 位作者 Shoutu LI Suiping QI Xiaoyu TANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第3期715-727,共13页
Duo to fluctuations in atmospheric turbulence and yaw control strategies,wind turbines are often in a yaw state.To predict the far wake velocity field of wind turbines quickly and accurately,a wake velocity model was ... Duo to fluctuations in atmospheric turbulence and yaw control strategies,wind turbines are often in a yaw state.To predict the far wake velocity field of wind turbines quickly and accurately,a wake velocity model was derived based on the method of momentum conservation considering the wake steering of the wind turbine under yaw conditions.To consider the shear effect of the vertical incoming wind direction,a two-dimensional Gaussian distribution function was introduced to model the velocity loss at different axial positions in the far wake region based on the assumption of nonlinear wake expansion.This work also developed a“prediction-correction”method to solve the wake velocity field,and the accuracy of the model results was verified in wake experiments on the Garrad Hassan wind turbine.Moreover,a 33-kW two-blade horizontal axis wind turbine was simulated using this method,and the results were compared with the classical wake model under the same parameters and the computational fluid dynamics(CFD)simulation results.The results show that the nonlinear wake model well reflected the influence of incoming flow shear and yaw wake steering in the wake velocity field.Finally,computation of the wake flow for the Horns Rev offshore wind farm with 80 wind turbines showed an error within 8%compared to the experimental values.The established wake model is less computationally intensive than other methods,has a faster calculation speed,and can be used for engineering calculations of the wake velocity in the far wakefield of wind turbines. 展开更多
关键词 far wake wake model wake steering wind shear wind farm
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Comparison and Verification of Coherent Doppler Wind Lidar and Radiosonde Data in the Beijing Urban Area
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作者 Zexu LUO Xiaoquan SONG +4 位作者 Jiaping YIN Zhichao BU Yubao CHEN Yongtao YU Zhenlu ZHANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第11期2203-2214,共12页
As a new type of wind field detection equipment, coherent Doppler wind lidar(CDWL) still needs more relevant observation experiments to compare and verify whether it can achieve the accuracy and precision of tradition... As a new type of wind field detection equipment, coherent Doppler wind lidar(CDWL) still needs more relevant observation experiments to compare and verify whether it can achieve the accuracy and precision of traditional observation equipment in urban areas. In this experiment, a self-developed CDWL provided four months of observations in the southern Beijing area. After the data acquisition time and height match, the wind profile data obtained based on a Doppler beam swinging(DBS) five-beam inversion algorithm were compared with radiosonde data released from the same location. The standard deviation(SD) of wind speed is 0.8 m s^(–1), and the coefficient of determination R~2 is 0.95. The SD of the wind direction is 17.7° with an R~2 of 0.96. Below the height of the roughness sublayer(about 400 m), the error in wind speed and wind direction is significantly greater than the error above the height of the boundary layer(about 1500 m). For the case of wind speeds less than 4 m s^(–1), the error of wind direction is more significant and is affected by the distribution of surrounding buildings. Averaging at different height levels using suitable time windows can effectively reduce the effects of turbulence and thus reduce the error caused by the different measurement methods of the two devices. 展开更多
关键词 coherent Doppler wind lidar RADIOSONDE wind measurement urban boundary layer
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Variational Reconstruction and Simulation Experiments of Sea Surface Wind Field for Ocean Data Buoy
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作者 LI Yunzhou HUANG Sixun +4 位作者 YAN Shen SUN Xuejin QI Suiping WANG Zhongqiu TANG Xiaoyu 《Journal of Ocean University of China》 SCIE CAS CSCD 2024年第3期577-582,共6页
The sea surface wind field is an important physical parameter in oceanography and meteorology.With the continuous refinement of numerical weather prediction,air-sea interface materials,energy exchange,and other studie... The sea surface wind field is an important physical parameter in oceanography and meteorology.With the continuous refinement of numerical weather prediction,air-sea interface materials,energy exchange,and other studies,three-dimensional(3D)wind field distribution at local locations on the sea surface must be measured accurately.The current in-situ observation of sea surface wind parameters is mainly achieved through the installation of wind sensors on ocean data buoys.However,the results obtained from this single-point measurement method cannot reflect wind field distribution in a vertical direction above the sea surface.Thus,the present paper proposes a theoretical framework for the optimal inversion of the 3D wind field structure variation in the area where the buoy is located.The variation analysis method is first used to reconstruct the wind field distribution at different heights of the buoy,after which theoretical analysis verification and numerical simulation experiments are conducted.The results indicate that the use of variational methods to reconstruct 3D wind fields is significantly effective in eliminating disturbance errors in observations,which also verifies the correctness of the theoretical analysis of this method.The findings of this article can provide a reference for the layout optimization design of wind measuring instruments in buoy observation systems and also provide theoretical guidance for the design of new observation buoys in the future. 展开更多
关键词 moored buoy three-dimensional wind field distribution variational analysis wind field reconstruction
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Perspectives of Vertical Axis Wind Turbines in Cluster Configurations
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作者 Ryan Randall Chunmei Chen +1 位作者 Mesfin Belayneh Ageze Muluken Temesgen Tigabu 《Fluid Dynamics & Materials Processing》 EI 2024年第12期2657-2691,共35页
Vertical Axis Wind Turbines(VAWTs)offer several advantages over horizontal axis wind turbines(HAWTs),including quieter operation,ease of maintenance,and simplified construction.Surprisingly,despite the prevailing beli... Vertical Axis Wind Turbines(VAWTs)offer several advantages over horizontal axis wind turbines(HAWTs),including quieter operation,ease of maintenance,and simplified construction.Surprisingly,despite the prevailing belief that HAWTs outperform VAWTs as individual units,VAWTs demonstrate higher power density when arranged in clusters.This phenomenon arises from positive wake interactions downstream of VAWTs,potentially enhancing the overall wind farm performances.In contrast,wake interactions negatively impact HAWT farms,reducing their efficiency.This paper extensively reviews the potential of VAWT clusters to increase energy output and reduce wind energy costs.A precise terminology is introduced to clarify ambiguous terms researchers use to quantify cluster parameters.While examining commonly studied and proposed VAWT cluster configurations,several aspects are discussed such as aerodynamic interactions,wake characteristics,structural dynamics,and performance metrics.Additionally,the current state-of-the-art and research gaps are critically described.The review also covers computational modeling,optimization techniques,advanced control strategies,machine learning applications,economic considerations,and the influence of terrain and application locations. 展开更多
关键词 Vertical axis wind turbines(VAWTs) cluster configuration wind farm wind energy performance enhancement
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