查询词典 condensation trail

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。

The analysis results have indicated that, the problem of condensation at glass fibre insulation should be noted when this kind of timber structure be popularized at hot-humid climate region. Some reasonable measures have been proposed to prevent condensation problem.

分析结果表明，在热湿气候地区推广应用该墙体需要注意玻璃纤维内部冷凝问题，这种新型墙体要在热湿气候地区广泛推广应用，需要设置水蒸气隔层以降低墙体内部冷凝发生的概率。

The flow in an initial condensation stage of low-pressure cylinder of a 200MW steam turbine is analyzed and the phenomena of non-equilibrium condensation are captured.

计算了一实际运行200MW汽轮机组低压缸的初始凝结级内的流动，捕捉到了叶片内的非平衡态凝结现象。

Equipment has just started work, the air tube through the Y series automatic air unit exhaust emission, low-temperature condensation water to enter the trap, the condensation of water level rise, float up, valve open, the rapid discharge condensate, steam fast access to equipment, equipment, rapid warming, Y series automatic row of air temperature sensing devices, liquid expansion devices automatically turn off the air row.

设备刚启动工作时，管道内的空气经过Y系列自动排空气装置排出，低温凝结水进入疏水阀内，凝结水的液位上升，浮球上升，阀门开启，凝结水迅速排出，蒸汽很快进入设备，设备迅速升温，Y系列自动排空气装置的感温液体膨胀，自动排空气装置关闭。

The experimental teeth were prepared using the modified double-flared technique and obturated by lateral condensation and vertical condensation with AH Plus or Pulp Canal Sealer EWT sealer.

选取 70颗直根管的上前牙，根管预备后随机分为对照组(阳性对照和阴性对照各 5颗)和A、B、C、D4个试验组，A、B组用侧向加压充填技术，C、D组用垂直加压充填技术充填根管，A、C组的封闭剂为AHPlus，B、D组为PulpCanalSealerEWT。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？