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blowing sand
相关语句
  扬沙
     (2) About 2/3 of the Spring dust storm was caused by blowing sand with the visibility within a range of 1-10 km;
     (2),北京春季风沙以能见度在1—10公里范围内的扬沙为主,约占2/3;
短句来源
     The blowing sand is the dominating phenomena (74.15%), the next is the floating ash(18.09%) and the dust storm(7.76%).
     北京地区主要是以扬沙天气为主,占总沙尘天气的74.15%,其次是浮尘天气(18.09%)和沙尘暴(7.76%);
短句来源
     Results Both the blowing sand and dust storm PM_(2.5) could decrease cell viability,inhibit plasma membrane Ca~(2+)Mg~(2+)-ATPase and Na~+K~+-ATPase,increase leakage of cytosolic LDH and ACP,and elevate surface fluidity of plasma membranes in a dose-dependent manner as compared with the control saline.
     结果与对照(生理盐水组)相比,扬沙和沙尘暴PM2.5样品可剂量依赖性地降低细胞存活率和质膜Ca2+Mg2+-ATP酶、Na+K+-ATP酶活性、增大细胞膜表层流动性,并使细胞质内LDH和ACP外渗;
短句来源
     Generally, the order of magnitude of mass concentration on clear days is 102 μg/m3 and 103 μg/m3 under the weather conditions of floating dust, blowing sand and dust storm. However, it can be up to 104 μg/m3 during severe dust storms.
     总体上讲,额济纳地区清洁大气中沙尘气溶胶浓度量级为102μg/m3,而浮尘,扬沙及沙尘暴期间沙尘气溶胶质量浓度量级为102μg/m3,超强沙尘暴沙尘质量浓度可达量级为104μg/m3,在不同风向影响下,气溶胶粒径分布呈现不同特征;
短句来源
     the pollution in blowing sand weather is light,the PM_(10) in the air is mainly from ground dust in local place.
     扬沙天气污染相对较轻,空气的PM10以本地地表尘为主。
短句来源
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  “blowing sand”译为未确定词的双语例句
     Effects of Different Heat Treatment Temperature on Stress Rupture Properties of DD3 Alloy after Blowing Sand
     不同热处理温度对吹砂后DD3合金持久性能的影响
短句来源
     On the basis of analyzing its types,distribution,trend and harmness,hereafter make evaluation of the development trend of regional windy and blowing sand environment.
     从退化角度而论,即对风沙环境土地类型进行划分和分等定级,通过对风沙环境的类型、分布、发展趋势及危险度的分析,为区域风沙环境的发展态势作一估测性评价。
短句来源
     Filling technology of blowing sand for high embankment in lake area
     湖区高填方路基吹砂填筑施工技术
短句来源
     Discussion on Blowing Sand Belt Structure
     风沙流结构规律探讨
短句来源
     The simulating experiment also demonstrated that the blowing sand could trigger electric discharge processes when applied a 2~4 kV high voltage to bare aluminum wire ends.
     ⑦导线直径相同时,铝线较之铜线具有较强的电位差,且当裸铝线两端加电压2~4kV时,出现尘端放电现象。
短句来源
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  相似匹配句对
     On Sand
     论砂
短句来源
     Discussion on Blowing Sand Belt Structure
     风沙流结构规律探讨
短句来源
     NUMERICAL SIMULATION OF SAND BLOWING PROCESS
     射砂过程的数值模拟
     Sand and Stone
     沙与石(英文)
短句来源
     Energy saving on blowing
     吹气节能
短句来源
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  blowing sand
Floating dust, blowing sand, and dust storms, primarily from Mongolia, account for 71%, 20%, and 9% of sand-dust weather, respectively.
      
We refer tosandstorms, duststorms and blowing sand as the phenomenaoccurring in the source region, while significant dustfall is thephenomenon that occur in the sink area.
      
Blowing sand encroached far into the now semi-arid savanna between approximately 20,000 and 12,500 years ago, which lakes had substatially greater volumes and rivers higher discharges between 9000 and 5000 years ago.
      
In the portable wind-tunnel used by Agriculture Western Australia, turbulence statistics were recorded over stable surfaces and in blowing sand from the initiation of erosion up to the time the sand supply was exhausted.
      
It can be used to trap blowing sand or planted for beautification.
      
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Results of analysis of the dust storm data in Beijing area during the pariod of 1951-1980 are as follows.(1) Dust storms were most frequent (51.6%) in Spring;less frequent (30.5%)in Winter;and much less frequent (<10%)in Summer and Autumn.(2) About 2/3 of the Spring dust storm was caused by blowing sand with the visibility within a range of 1-10 km; about 1/4 caused by sand haze; only 1/12 was sand storm,its visibility is less than 1km.(3) 87% of the sand and dust in the Spring dust storms...

Results of analysis of the dust storm data in Beijing area during the pariod of 1951-1980 are as follows.(1) Dust storms were most frequent (51.6%) in Spring;less frequent (30.5%)in Winter;and much less frequent (<10%)in Summer and Autumn.(2) About 2/3 of the Spring dust storm was caused by blowing sand with the visibility within a range of 1-10 km; about 1/4 caused by sand haze; only 1/12 was sand storm,its visibility is less than 1km.(3) 87% of the sand and dust in the Spring dust storms was originated locally,while 13% of that came from dry deserts and loess plateau north of Beijing.(4)The lowest wind speed that would cause a dust storm in Beijing is 4.7 m/s.Rain is effective to subdue a dust storm.(5) Prevalence of the dust storm was also closely related to tree and lawn planting.Before 1949,trees and lawns were rarely planted in Beijing,thus between 1951 and 1960 dust storms were most frequent,with an average of about :30 storms each Spring,about one storm per three days.After liberation,great efforts have been made to develop tree planting and growing lawns.By 1961,the area of lawn has been increased by more than four times and number of trees planted by more than 200 times.As a result,Spring dust storm in Beijing decreased greatly between 1961 and 1970 with an average of one storm per ten days.In the ten years after 1966,area of lawn was decreased by 11% and number of trees by 40%,thus from 1971 to 1980 dust storms have increased again in the last ten years with one storm a week as an average.If green area would be increased two times than as now is,Beijing would be almost freed from sufferiny of Spring dust storms.

本文分析了1951—1980年北京30年风沙资料,研究得出:(1)、北京风沙春季最多,占51.6%;冬季次之,占30.5%;夏秋最少,均不足10%。(2),北京春季风沙以能见度在1—10公里范围内的扬沙为主,约占2/3;浮尘占1/4多;能见度小于1公里的沙尘暴最少,仅占1/12。(3),北京春季风沙87%的沙尘是来源于本地,有13%来源于干旱沙漠地区和黄土高原。(4),引起北京春季风沙的风速需在4.7米/秒以上。降水能抑制风沙形成。(5),北京春季风沙与造林绿化密切有关。解放前,北京树木和绿地很少,因此1951—1960年期间风沙极为频繁,平均每年春季约30次,约每三天有一次风沙日。解放后,大力开展绿化造林,到1961年,绿地扩大了四倍多,树木数目增长了200多倍,所以1961—1970年期间,春季风沙大幅度减少,平均每10天有一次风沙日。1966年以后10年,绿地减少了11%,树木减少了40%,因此,1971—1980年的最近10年期间,春季风沙又有回升趋势,平均每周有一次风沙天气。北京的绿地面积再扩大两倍,即可基本上制止风沙为害。

In recent years, argument about wind-drift sand of Beijing has continued arising This paper presented some understandings for wind-drift sand problems of Beijing based on the field investigaton. 1) In accordance with geoche-micaJ analysis of heavy minerals and microelements in the sand caused by various reasons, and comparison with near by deserts and sandy lands, it is confirmed that wind-drift sand materials in Beijing are river sediments of the local region, which are blown off and then accumulated, and dust...

In recent years, argument about wind-drift sand of Beijing has continued arising This paper presented some understandings for wind-drift sand problems of Beijing based on the field investigaton. 1) In accordance with geoche-micaJ analysis of heavy minerals and microelements in the sand caused by various reasons, and comparison with near by deserts and sandy lands, it is confirmed that wind-drift sand materials in Beijing are river sediments of the local region, which are blown off and then accumulated, and dust storm and particles come mainly from the areas where prevailing wind occurs and passes through. 2) According to the data observed in meteorological stations in various counties of Beijing for a long time, wind-drift sand of Beijing is divided into five types, i.e. blowing sand; blowing sand-suspended dust,suspended dust by strong wind; suspended dust and sand storm. Regional distributive law of different wind-drift sand is presented too in this paper. Meanwhile it points out that differances of geomorphic position and surface sediment type of stations are the basic causes of the formation of different sand types 3 ) Several fluctuations of sand drifting days occur with increasing or reducing of strong wind days and the changes in phenomenon of sand storm, suspended dust and biowing sand also take place, but the general trend of sand drifting days are gradually reducing. Taking the data of Beijing city as an example, the average annual sand drifting days reduce from 78 days in the early 1950s to 19.3 days in the eariy 1980s. It indicates that increasing green areas and establishing and perfecting anti-wind system in Beijing in planned way are the primary measures to cotrol wind-drift sand

本文在实地调查研究的基础上提出对北京风沙一些问题的看法: 1)北京风沙物质来源为本地超沙,尘的来源复杂,以外来成分最多;2)分析35午风沙资料得出这些年北京平原风沙趋于成少。

Thus far there is no ideal instrument for measurement of three forms of movement of blowing sand. First of all,the measurement of creep load can only be done in the laboratory,its field measurement is simultaneously conducted with saltation load. In the observation processes of saltation movement attention should be paid to the surface stability to avoid vortex caused by sand-taped instrument, which will exert influence on the sand collection. Secondly, there is no suitadle instrument to measure...

Thus far there is no ideal instrument for measurement of three forms of movement of blowing sand. First of all,the measurement of creep load can only be done in the laboratory,its field measurement is simultaneously conducted with saltation load. In the observation processes of saltation movement attention should be paid to the surface stability to avoid vortex caused by sand-taped instrument, which will exert influence on the sand collection. Secondly, there is no suitadle instrument to measure suspension load, while the dust- taped instrument adopted by environmental protection departments canonly be used to trap particles less than 20 u,especially less than10u,which is not suitable ror measurement of suspension load discharge Therefore, there is an urgent need to develop a new instrument for trap of larger suspension particles (20-100u). The existing inertial sand-taped instrument could be successfully used to measure saltation load, which usually makes up a majority of the total sand discharge , but its trap efficiency is poor for finer particles. The factors affecting the trap efficiency of existing inertoal sand-taped instrument were analysed.

叙述并评价了风沙运动三种形式中现有的测量仪器,并提出了研制、改进的方向。对常风下三种风沙运动方式中占绝大多数的跃移运动的观测仪器,作者认为:目前通用的惯性集沙仪是现有各类集沙仪器中最好的。对惯性集沙仪的收集效率进行了测定并提出了影响收集效率的因素。

 
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