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重空气
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  “重空气”译为未确定词的双语例句
     The result suggests that the more severe the air pollution, the lower the density of negative ion, the greater the density of positive ion and the q coefficient.
     调查表明,空气污染越重,空气负离子浓度越低,正离子浓度越高,单极系数(q值)亦越大。
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     Discussion on the dynamic analysis method of air dense-medium fluid bed
     空气介质流化床动态分析方法
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     Current state of coal dry beneficiation with air-dense medium fluidized bed
     空气介质流化床分选技术分析
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     CHAPTER 5 MARINE SEDIMENTATION Section 4 Heavy Mineral
     矿物
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     NEWAIR
     新空气
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     making full use of conditions and connecting across;
     条件。
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  heavy air
Two gas pairs are used to illustrate both the heavy/light (air/He) and the light/ heavy (air/SF6) cases.
      
Georg Kelling and his wife were killed during the heavy air raids on Dresden on 13 and 14 February 1945, but his vague footprints are still in the sands of medical history.
      
The trees grew in an area of heavy air pollution and forest decline on a mountain ridge in the eastern Ore Mountains (Czech Republic).
      
The highest deposition fluxes were measured at Novaggio (Southern Switzerland), exposed to heavy air pollution originating from the Po Plain, with throughfall fluxes averaging 29 kg ha-1 a-1 for N and 15 kg ha-1 a-1 for S.
      
The spots were dark and opaque at Chongqing, where heavy air pollution was observed.
      
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According to the analysis on motorcycle's dynamics,so long as the values of dynamic factor D are the same,the capacities for overcoming rolling,climbing and accelerating resis- tances for unit vehicle weight will be the same too,no matter how the vehicle weight,air resistance and driving force change.So the dynamic factor D can be used as an index to specify motorcycle's dynamic characteristics.There is a corresponding curve of dynamic factor D for each specific gear ratio i.The greater the value of the gear...

According to the analysis on motorcycle's dynamics,so long as the values of dynamic factor D are the same,the capacities for overcoming rolling,climbing and accelerating resis- tances for unit vehicle weight will be the same too,no matter how the vehicle weight,air resistance and driving force change.So the dynamic factor D can be used as an index to specify motorcycle's dynamic characteristics.There is a corresponding curve of dynamic factor D for each specific gear ratio i.The greater the value of the gear ratioi is,the greater the dynamic factor will be,and vice versa.Generally the given value of the dynamic factor of a motocyele at the highest gear D_(max) is between 0.08 and 0.12.In order to make full use of motorcycle's power,gear ratio i at the highest gear should meet the requirement of i≥ i_(min).Theoretically,the more the gear levels between the highest and the lowest gear there are,the more ideal the outer envelop curve composed by accelerating curve group will be. Actarally in general the maximum gear levels is 6.The distributing relation of the gear ratio i_(min) is as follows:(i_1/i_2)>(i_2/i_3)>…>(i_n-1/i_n).The gear ratio i should be chosen appropriately so as to make the load factor at common speed be in the best economic fuel consumption area in the mapping characteristic chart.If the fuel economy contrary to the dynamic property of a motorcycle,the preference should be given to the latter.

根据摩托车动力学分析,不论车重、空气阻力、驱动力如何变化,只要动力因数 D 相同,单位车重克服道路滚动阻力、坡度阻力和加速阻力的能力就相同,因此可将动力因数 D 作为表征摩托车动力特性的指标;对于每一个确定的传动比 i,都有一条与之相对应的动力因数 D 曲线,传动比 i 越大,则动力因数亦越小,反之亦然;摩托车最高档的动力因数 D(?)一般定在0.08~0.12之间;为充分发挥发动机功率,最高档传动比 i 应满足 i≥i_(min);理论上从最低档到最高档的中间档位越多,则加速度曲线组所形成的外包络线也越接近于理想曲线,但实际一般最多为6档;传动比的分配关系为(i_1)/(i_2)>(i_2)/(i_3)>…>(i(?)-1)/(i(?));应选择合适的传动比 i,使常用车速时的负荷率在万有特性图中发动机最佳经济油耗区内;当燃油经济性与动力性矛盾时,应首先保证摩托车的动力性。

With the rapid development and expansion of city,the physical characteristics(such as surface albedo and so on)and property of the urban underlying surfaceare undergoing substantially changes,which significantly impact the atmosphere and environment,for example urban heat island(UHI)effect.By utilizing the new-generation numerical GRAPES-meso model developed by Chinese Academy of Meteorological Science,two 24 hours numerical experiment schemes were designed and performed to investigate the impact of urban albedo...

With the rapid development and expansion of city,the physical characteristics(such as surface albedo and so on)and property of the urban underlying surfaceare undergoing substantially changes,which significantly impact the atmosphere and environment,for example urban heat island(UHI)effect.By utilizing the new-generation numerical GRAPES-meso model developed by Chinese Academy of Meteorological Science,two 24 hours numerical experiment schemes were designed and performed to investigate the impact of urban albedo change on a typical UHI event over the Beijing metropolitan area during a serious air pollution process on 6-8,October 2004.The control experiment was numerically integrated with the default model albedo value of 0.18 for the urban landuse,but the sensitive experiment was conducted with a smaller urban albedo value of 0.15,which is based on the actual value observed at the 280 m high iron tower of Institute of Atmospheric Physics,Chinese Academy of Science.After comparing the results of the two numerical experiments with 1-km fine horizontal resolution,the following major conclusions are summarized:Either in urban area or rural area,the diurnal variation of near-surface atmospheric temperature is successful simulated for the selected UHI event(6-8 October 2004)by the GRAPES-meso model.The change in urban albedo has significant impact on the evolution of UHI,and a reduction of 0.03 in urban albedo would increase the intensity of UHI by about 0.8 ℃,thus yielding a more reasonable intensity of UHI relative to the actually observed value.This indicates that the reduction in urban albedio resulted from urban expansion is favor to the enhancement of UHI.In addition,under the condition of a reduced albedo for urban landuse,the long wave radiation flux is larger in urban center than that in the surrounding suburban areas,which further contributes to the development of UHI.More over,the simulated near-surface wind fields also suggest that the decrease in urban albedo could increase the wind convergence in the urban area,thus favorable to the enhancement of the air pollution process over the urban area of Beijing.

随着城市的不断发展,城区地表反照率等下垫面物理特征和属性会发生明显的变化,进而会对城市热岛等大气环境形成影响。文中使用中国气象科学研究院开发的新一代数值天气预报模式(GRAPES),针对2004年10月北京一次重空气污染事件中的典型城市热岛过程,分别设计了两种数值试验方案:(1)对照试验,使用模式缺省的城区下垫面反照率参数,取值0.18;(2)敏感性试验,参考同期中国科学院大气物理研究所铁塔280m高度下垫面反照率观测事实,将北京区域城市类型下垫面反照率减小至0.15。通过对比两种试验方案在1km水平分辨率下的24h模拟结果,研究了城市下垫面反照率变化对北京地区城市热岛过程的影响。结果表明:(1)GRAPES模式可成功模拟此次热岛过程中城区和郊区近地面温度的日变化趋势;(2)城市下垫面反照率的变化对城市热岛的发展非常重要,城市反照率下降0.03会使城市热岛强度增强0.8℃左右,结果也更接近实况。这说明随着城市发展引起的地表反照率减小有利于城市热岛强度增加;(3)通过分析地表的长波辐射发现,在城市区域较小反照率情形下,城区的长波辐射始终比郊区大,有利于热岛的形成;同时也有利于城区近地层的风场辐合增加...

随着城市的不断发展,城区地表反照率等下垫面物理特征和属性会发生明显的变化,进而会对城市热岛等大气环境形成影响。文中使用中国气象科学研究院开发的新一代数值天气预报模式(GRAPES),针对2004年10月北京一次重空气污染事件中的典型城市热岛过程,分别设计了两种数值试验方案:(1)对照试验,使用模式缺省的城区下垫面反照率参数,取值0.18;(2)敏感性试验,参考同期中国科学院大气物理研究所铁塔280m高度下垫面反照率观测事实,将北京区域城市类型下垫面反照率减小至0.15。通过对比两种试验方案在1km水平分辨率下的24h模拟结果,研究了城市下垫面反照率变化对北京地区城市热岛过程的影响。结果表明:(1)GRAPES模式可成功模拟此次热岛过程中城区和郊区近地面温度的日变化趋势;(2)城市下垫面反照率的变化对城市热岛的发展非常重要,城市反照率下降0.03会使城市热岛强度增强0.8℃左右,结果也更接近实况。这说明随着城市发展引起的地表反照率减小有利于城市热岛强度增加;(3)通过分析地表的长波辐射发现,在城市区域较小反照率情形下,城区的长波辐射始终比郊区大,有利于热岛的形成;同时也有利于城区近地层的风场辐合增加,对此次污染过程的发展是有利的。

 
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