查询词典 condensation

The present invention desalts brine to produce fresh water at normal condition through evaporation in the air to produce vapor condensation of the evaporated water molecules in certain condition and recovering condensation heat for circular use.

本发明是有关基于在常压条件下盐水蒸发产生水蒸汽，水蒸汽冷凝，并回收其冷凝热以供盐水蒸发所需热量的机理实现对苦咸水、海水等脱盐产生淡水的方法。

Methods Sixty patients with pulpitis or periapical periodontitis were divided into two groups randomly, which were obturated by continuous wave of condensation technique and lateral condensation technique respectively.

选择牙髓病或根尖周病患者60例，按就诊顺序随机分为两组，分别采用连续波充填技术和冷牙胶侧方加压充填技术进行根管充填。

The invention discloses a treating method of tail water membrane filtering condensation fluid in chemical industry park, the steps of which are that the pre-treated membrane filtering condensation fluid goes through a device filled with resinous adsorbent under the common temperature and a flow quantity of 0.5-8BV / h, the absorbed water can be discharged after neutralizing with small capacity of alkali, desorbing and regenerating the resin by natrium hydroxydatum solution with the flow capacity of the desorbing agent is 0.5-3.0BV / h, the high concentration desorbing fluid disposes safely and the low concentration desorbing fluid can be periodically used to preparing next pluralities of desorbing agent.

本发明公开了一种化工园区尾水膜滤浓缩液的治理方法。其步骤为：将预处理后的膜滤浓缩液在常温和0.5～8BV/h的流量条件下，通过装填有树脂吸附剂的装置，吸附出水加少量碱中和后即可排放；将上述树脂用氢氧化钠溶液脱附再生，脱附剂流量为0.5～3.0BV/h，高浓度脱附液安全处置，低浓度脱附液可用于配制下一批脱附剂循环套用。

Meanwhile, the partial steam pressure is much lower than the total pressure of steam and air mixture and the corresponding condensation water temperature declines dramatically, so the condensation water in this zone supercools further.

在抽气口附近，空气所占的重量百分比可达50—60%，此时，蒸汽分压力大大低于混合气体的总压力。

The area of steam condensation zone then decrease and the area of air cooling zone increases, so the oxygen content of condensation water gains.

试验结果表明，在25%额定负荷时，空气的泄漏量约为100 %负荷时的一倍。

Based on " Green" chemistry , this paper mainly reviewed the latest research advance of the hydrotalcite-like materials and their derived composite oxides as an excellent solid base catalyst used in aldol condensation, Knoevenagel condensation, Michael addition, transesterification reactions and so on.

以绿色化学为基础，综述了类水滑石及其以类水滑石为前驱体衍生的复合氧化物作为一类优异的固体碱催化剂应用于醇醛缩合、克诺文诺盖尔缩合、麦克尔加成以及酯交换等反应的最新研究进展。

This paper mainly studies the synthesis of 2-Isopropyl-5-Methyl-2-Hexenal from the optimum reaction conditions of from self aldol condensation of Isovaleraldehy,with NaOH solution as the catalyst of the condensation.

本文以NaOH水溶液为催化剂，探讨了异戊醛Aldol缩合制备可可醛(2异丙基5甲基2己烯醛)的最佳反应条件：反应温度50℃、反应时间9h、催化剂NaOH水溶液的浓度2mol.L1、OH-/异戊醛为1/1，主产物可可醛的产率为92.2%。

In order to study the aldol condensation of 2.15-hexadecanedione on the surface of aluminium, the intermolecular condensation mechanism of acetone occurring on aluminum was simulated by using semi-empirical AM1 method embodied in MOPAC 6.0 program package. The optimized structures and geometry parameters of 5 transition complexes and 4 intermediates were given.First, 2 molecules of acetone coordinated with aluminum by electrostatic attraction.One atom of hydrogen of acetone migrated to aluminum because of t...

为了研究2，15－十六烷二酮在氧化铝表面的环合机理，选择小分子丙酮为模型化合物，用量子化学半经验AM1方法研究双分子丙酮在氧化铝表面的醛醇缩合机理，给出了反应过程中的5个过渡态和4个中间体的结构和几何参数，该催化反应可以认为是氧化铝分子与两分子丙酮分子发生静电络合作用，然后借助氧原子的负电荷导致脱氢并实现缩合，根据中间体的能量变化，推测有较稳定的铝复合物生成。

Papers in the experimental part of our literature considered on the basis of the experimental exploration, and podophyllotoxin intermediates with the structural characteristics of a simple pepper aldehyde as the starting material,α,β-unsaturated carbonyl compounds are selective reduction lithium aluminum hydrogen reduction reaction as the key steps to have the Knoevenagel condensation, peracetic acid epoxy between chlorine and alkaline hydrogen peroxide epoxy, DCC condensation esterification reaction of the three podophyllotoxin intermediates.

论文实验部分我们在综合考虑文献的基础上，经过实验摸索，并结合鬼臼毒素中间体的结构特点以简单的胡椒醛为起始原料，对α，β-不饱和羰基化合物具有选择性还原的锂铝氢还原反应为关键步骤，先后经过Knoevenagel缩合，间氯过氧苯甲酸环氧化，碱性过氧化氢环氧化，DCC缩合酯化等反应合成了3个鬼臼毒素中间体。

Dihydropyrimidin-2 (1H)-ones were synthesized by condensation of aromatic or aliphatic aldehydes, urea and ethyl acetoacetate or acetylacetone one-pot three-component Biginelli condensation in the presence of room temperature ionic liquids as catalysts under solvent-free conditions.

5利用室温离子液体作催化剂，芳香或脂肪醛、尿素和乙酰乙酸乙酯或乙酰丙酮三组分缩合制备3，4-二氢嘧啶-2-酮衍生物。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。