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exchange site
相关语句
  “exchange site”译为未确定词的双语例句
     Farm products wholesale market is an organization which can offer exchange site and exchange condition.
     农产品批发市场是指专门为农产品批发交易提供交易的场所和条件,并为商品流通提供服务的组织机构。
短句来源
     Talent market is the exchange site of complex labor force.
     人才市场是复杂劳动力交换的场所。
短句来源
  相似匹配句对
     Talent market is the exchange site of complex labor force.
     人才市场是复杂劳动力交换的场所。
短句来源
     Building on the Site
     基地中的建筑
短句来源
     Parasitic site of C.
     发现鹌鹑源C.
短句来源
     Cultural Exchange
     文化交流
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     The Stock Exchange
     证券交易所
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查询“exchange site”译词为用户自定义的双语例句

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  exchange site
After the steam treatment, the activity of Fe/ZSM-5 decreased due to the dealumination of ZSM-5 and the migration of Fe ion isolated in the ion exchange site to form ferromagnetic iron agglomerate.
      
Two phosphorylation sites have been identified, one being the HPr/P-HPr exchange site, the other being the mannitol/mannitol-P exchange site.
      
It can be expected that the interaction between the positive charge of Agnδ+ clusters and acid sites, i.e., the ion-exchange site of zeolites, stabilizes Agnδ+ clusters.
      
From the general curve shape analysis of the capacity-pH curves, the possible ion exchange site acidity and site group concentration were characterized.
      
Bifunctionality is achieved by adding a second anion-exchange site to the pyridine nitrogen (also an anion-exchange site) of the base poly(4-vinylpyridine) resin.
      
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The charge characteristics of the clay fraction of red soils under present investigation are summarized as follows: (1) The clay fraction of red soils carries a smaller amount of negative charge, but a greater amount of positive charge than that of neutral soils of temperate regions. The humus of the clay fraction of red soils has smaller calculated "apparent negative charge" than that of neutral soils, but it gives a relatively large quantity of negative charge to the entire clay. These characteristics are...

The charge characteristics of the clay fraction of red soils under present investigation are summarized as follows: (1) The clay fraction of red soils carries a smaller amount of negative charge, but a greater amount of positive charge than that of neutral soils of temperate regions. The humus of the clay fraction of red soils has smaller calculated "apparent negative charge" than that of neutral soils, but it gives a relatively large quantity of negative charge to the entire clay. These characteristics are more significant for certain laterites. (2) The electric charge carried by the clay fraction of red soils varies distinctly at different pH and in different soil types. For a red soil derived from Quaternary red clay in central China, a variable negative charge appears at soil acidity strenger than pH 5, and a negative adsorption of chloride takes place at pH above 6. The laterite carries net negative charge at higher pH and net positive charge at lower pH with an isoelectric point of about pH 4. In the laterite isoelectric point increases after the removal of humus but decreases after the removal of humus and free iron oxides. The variability of electric charge of the red soils derived from granite in southern China lies in between that of the above-mentioned soils. In view of the linear relationship between the negative charge and the pH value and in view of the appearance of an inflection point within the range of pH 5—6, it is inferred that the clay fraction of these red soils possesses two types of negative exchange sites with different degrees of ionization. (3) The specific surface area of the clay fraction of red soils is relatively low. The removal of free iron oxides causes a considerable reduction in specific surface area, especially the external surface area. Since the calculated "apparent specific surface area" of free iron oxides shows a value several times larger than that of the residue, it is supposed that the coatings of free iron oxides might be present on the clay surface in a finely divided and porous state. (4) The surface charge density of red soils obtained by dividing the net negative charge by the specific surface area is generally between 15—20 μ-coulombs per cm~2, or as low as 10 μ-coulombs for some laterites. It increases appreciablely with the rise of pH or the removal of free iron oxides. (5) The experimental results lead to the conclusion that the free iron oxides play an important role in determining the charge characteristics of red soils.

红壤胶体的负电荷较其它类型土壤为少,而正电荷则较多。红壤胶体的腐殖质的“表观负电荷”也较小,但对胶体负电荷的相对贡献却较大。这些特点,砖红壤胶体表现得更为突出。红壤胶体的电荷具有较大的可变性。第四纪红色粘土发育的红壤在pH5以上时产生可变负电荷,在pH6以上时对氯离子为负吸附;砖红壤在低pH时带淨正电荷,pH较高时带淨负电荷,其等电点pH约为4.0。腐殖质使砖红壤的等电点降低,游离氧化铁使等电点升高;花崗岩发育的经壤的負电荷数量介于上两种土壤之间,没有出现等电点。这三种红壤胶体的负电荷有随pH升高而增加的趋势,在pH5—6处有一转折点。由此看来,这三种胶体上可能存在着两种解离程度不同的交换点。红壤胶体的比表面较小,当去除游离氧化铁后,表面积特别是外表面积显著減小。游离氧化铁的“表观比表面”较胶体晶核者大数倍,推想,游离氧化铁可能是以多孔状的聚积体形态,包被在胶体晶核的表面上。根据红壤胶体的淨负电荷和比表面算得的红壤胶体的表面电荷密度,一般多在每平方厘米15—20微库仑之间,某些砖红壤可低到10微库仑左右。去除游离氧化铁后,表面电荷密度显著增大。

For the purpose of calculating the bonding energies of sodium and potassium ions in relation to the electric charge of soils,cation activities of the suspension in equilibrium with various types of soils or clays carrying different electric charge were measured with glass electrode.It was found that for the same soil type the bonding energy was a func- tion of the relative proportion of the clay concentration to the total concentration of cations in the system.The bonding energy of a lateritic soil was changed...

For the purpose of calculating the bonding energies of sodium and potassium ions in relation to the electric charge of soils,cation activities of the suspension in equilibrium with various types of soils or clays carrying different electric charge were measured with glass electrode.It was found that for the same soil type the bonding energy was a func- tion of the relative proportion of the clay concentration to the total concentration of cations in the system.The bonding energy of a lateritic soil was changed when the soil particles were coated with a layer of ferric oxides so as to alter their electric charge. Changes of bonding energy were also found when the cation-exchange capacity of a ben- tonite clay was decreased by thermal treatment.With respect to the soil type,it was shown that the bonding energies of the yellowish brown earth were almost double that of the lateritic soil.The pH of the medium affected the bonding energy markedly, even for the bentonite clay or cation-exchange resin with little or no variable electric charge. Evidences seem to favour the assumption that at lower pH the competition of aluminum and hydrogen ions for exchange sites is one of the important factors in causing the decrease of the bonding energy of alkali metal ions.It was suggested that Coulomb's force is a decisive factor in inducing the interaction between the cations and the electric charge of soil particles,and in this respect the local electric field strength on clay particles seem to be more important than the mean volume charge density of the whole system.

应用砖红壤、红壤、黄棕壤和两种粘土矿物,根据用玻璃电极所测得的离子活度计算了土壤对钠和钾离子的结合能,结果发现:1.当悬液中的离子数量相等时,固相的电荷愈多,结合能愈大。2.当保持固相的电荷量相等时,离子量愈少,则结合能愈大。3.无论是可变电荷的比例很大的砖红壤,还是可变电荷的比例很小的膨润土或不含可变电荷的强酸型阳离子交换树脂,pH 对结合能都有强烈的影响。作者根据实验材料认为,土壤体系中局部的电场强度较整个体系的平均体积电荷密度在决定离子的结合能方面具有更大意义;在 pH 低时,氢铝离子对交换点的竞争是钾、钠离子的结合能减小的一个重要原因.

The relationship between silica fouling of the anion exchange resins and polymerization degrees of polysilicic acid or the organic structures of resins was studied.Our experimental results showed that low polymerization degrees of polysilicic acid from the sample solutions would permeate easily into the anion exchange resins and be adsorbed by them,though not occupy ion exchange sites. It was found that tri-tetrapolysilic acids were easily adsorbed through both hydrogen bonding and polar bonding...

The relationship between silica fouling of the anion exchange resins and polymerization degrees of polysilicic acid or the organic structures of resins was studied.Our experimental results showed that low polymerization degrees of polysilicic acid from the sample solutions would permeate easily into the anion exchange resins and be adsorbed by them,though not occupy ion exchange sites. It was found that tri-tetrapolysilic acids were easily adsorbed through both hydrogen bonding and polar bonding by strong base anion exchange resin beads of 201 x 7 type which had been prepared from chloromethylated polystyrene-divinyl benzene beads reacted with trimethyl amine.Tri-tetrapolysilicic acids inside 201×7 resin beads are easily subject to further polymerization to higher polymerized state, and that leads to silica fouling of the resin. Besides, adsorbed silica was found to be increased with increasing exchange sites of the strong base anion exchange resin; and the lower the basicity of the resins is, the less the adsorbed silica is,i.e., the weak base anion exchange resin adsorbs less silica than that of the strong base anion exchange resin. When the cross-link of anion exchange resin decreases, the higher degree of polymerized silicic acid can permeate into the resin and be adsorbed by the resin. Our rests proved that the weak base anion exchange resins such as the resin of either 705 type or 370 type, and also the resin prepared from amination polyvinyl chloride, do have lower adsorptibility of silica as compared with that of 201× 7 resin.

本文研究了阴离子交换树脂硅中毒与硅酸分子大小及树脂结构的关系。实验结果表明:(1)溶液中的低分子量聚硅酸(三、四硅酸)易进入树脂而被吸附,但不占据树脂的交换基,(2)树脂的交换容量高,吸附的硅酸多;(3)树脂的碱度低,吸附的硅酸少;(4)树脂的交联度低,孔隙大,比三、四硅酸分子稍大的聚硅酸也能被树脂吸附;(5)370型、705型及胺化聚氯乙烯等树脂吸附的二氧化硅要比201×7树脂少。

 
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