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chemical stratification
相关语句
  化学地层
     CHARACTER OF THE CHEMICAL STRATIFICATION IN THE REGION OF CHONGZUO-DONGLUO,GUANGXI
     广西崇左—东罗测区化学地层特征
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  相似匹配句对
     CHARACTER OF THE CHEMICAL STRATIFICATION IN THE REGION OF CHONGZUO-DONGLUO,GUANGXI
     广西崇左—东罗测区化学地层特征
短句来源
     Chemical Sensors
     化学量传感器 第五讲 生物传感器 二酶传感器(二)
短句来源
     Chemical Sensors
     化学量传感器 第五讲 生物传感器 三 微生物传感器(一)
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     social stratification
     社会分层
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     On Social Stratification
     社会分层论
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  chemical stratification
Onondaga Lake, N.Y., failed to turnover in the spring of 1986 because of the strong chemical stratification under the ice that developed as a result of ionic discharges from an alkali plant.
      
Chemical stratification in the Seneca/Oswego rivers (NY)
      
Interrelated seasonal shifts in acid-base and oxidation-reduction systems that determine chemical stratification in three dissim
      
The artificial circulation system resulted in an overall reduction in the physical stability of the water column, making the lake subject to alternating periods of weak chemical stratification and mixing.
      
Strong thermal and chemical stratification developed in the water column early in spring and led rapidly to anoxia in the hypolimnion, which extended to less than 1.0 m from the surface.
      
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Interrupted or cyclic oxidation of five TiAl based alloys at 800~1?000?℃,100?h were carried out, cross section microstructure and oxides constitution were investigated by SEM, EDS equipments. The results show that stratification is one of the characteristics of oxidation of TiAl. Mixture layer of TiO 2+Al 2O 3 is formed firstly, after that there is the formation of diffusion zone inside and pure TiO 2 scale outside. Continuous Al 2O 3 film is observed scarcel. Chemical stratification is transformed...

Interrupted or cyclic oxidation of five TiAl based alloys at 800~1?000?℃,100?h were carried out, cross section microstructure and oxides constitution were investigated by SEM, EDS equipments. The results show that stratification is one of the characteristics of oxidation of TiAl. Mixture layer of TiO 2+Al 2O 3 is formed firstly, after that there is the formation of diffusion zone inside and pure TiO 2 scale outside. Continuous Al 2O 3 film is observed scarcel. Chemical stratification is transformed into physical stratification once delamination occurs due to the effect of growth stress and thermal stress, and the protection of oxide layers is destroyed consequently. [

用SEM及EDS研究了 5种TiAl基合金经 80 0~ 10 0 0℃ ,10 0h断续氧化及循环氧化后氧化剖面的结构、组成。结果显示 ,TiAl氧化表面存在分层现象。首先形成 (TiO2 +Al2 O3 )混合层 ,其次是新相过渡层 ;较少观察到连续的Al2 O3 层。因应力作用 ,氧化层开裂乃至剥离后 ,化学分层转入物理分层阶段 ,氧化层保护性恶化。

The paper include the character the chemical stratification from Chongzuo-Dongluo. It can gain that the chemical stratification is an important part of petrostratigraphy, and region fracture influence variable of element Abundance in rock.

文章阐述了崇左—东罗测区化学地层特征 ,表明了化学地层是岩石地层重要组成部分 ,同时区域性断裂影响了岩石内元素含量变化

In order to elucidate factors controlled the water column stratification in canyon-reservoirs, and describe the relative response of water quality, we present a 13-month survey and study of meteorological, physical and hydro chemical patterns during 2001 in a canyon-reservoir, southwestern China, especially including a intensive frequency study during the period from August to November of this year in which an event of water quality abruptly degeneration occurred. The study showed that: an obscure thermal stratification...

In order to elucidate factors controlled the water column stratification in canyon-reservoirs, and describe the relative response of water quality, we present a 13-month survey and study of meteorological, physical and hydro chemical patterns during 2001 in a canyon-reservoir, southwestern China, especially including a intensive frequency study during the period from August to November of this year in which an event of water quality abruptly degeneration occurred. The study showed that: an obscure thermal stratification has been formed on vertical profile of water column during summer (about from April to October) in Baihua Lake reservoir, however, it could cause the very strong hydro chemical stratification (i. e. dissolved oxygen stratification) in same period in water column of the reservoir. During summer of 2001, the oxide-reduce interface could move up to 8 meter-depth from bottom of Baihua Lake reservoir. The survey results also confirmed that gravitationally unstable of the thermal stratification caused by surface cooling of water when the air temperature decreased abruptly in early fall, leaded to a vertical convection between the upper layer water and deep layer water. The reductants (e.g. Mn2+ , Fe2+ and H2 S ) formed in the anoxic hypolimnion companying with processes of organic maters degeneration would be brought to the epilimnion through the vertical eddy diffusion. These reductive matters would consume up the dissolved oxygen in the utter water rapidly as if such oxidization reactions were strong enough, and than a large number of aquatic organism dead due to oxygen deficient. This study showed that the seasonal thermal stratification, although not strong like typical alpine lakes, could play a key role in change of water quality in canyon-reservoirs.

选择西南云贵高原乌江流域的百花湖水库进行了气象、水温度和水化学(DO、FeⅡ和MnⅡ)的连续监测(13个月).结果表明,由于气候等原因,百花湖水库的水体在夏季形成分层,但是没有典型分层湖泊的温跃层变化,这种水体温度结构可以在4-10月保持稳定;这种"不显著的"温度分层结构,有效限制了上下水团的混合,形成显著的水体溶解氧分层,氧化/还原界面可达到水深8m左右.20世纪90年代初以来,贵州多座水库频繁出现的季节性水质恶化现象,与水库水体混合期(多为夏末初秋),水体分层结构失稳有关.上下层水体的垂直交替,使下层水体中的还原性物质带入上层湖水,造成表层水体缺氧和表观浑浊,鱼类窒息死亡.在百花湖水库的研究表明,西南地区深水水库,可以在夏季出现一定的水体温度分层结构,并导致显著的水体水化学(如溶解氧)分层,进而影响水库水环境质量.

 
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