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In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

Marc was used to calculate the temperature distribution of All-metal radiation shields and uniformity of furnace temperature.

利用MSC.Marc有限元软件对真空热处理炉各层间的温度分布和炉温均匀性进行了计算。

Through simulation in computer using the all-purpose computer simulation software secondary cooling in slab continuous casting and test results, the influence of the factor such as casting speed, casting temperature, shell thickness and secondary cooling system are analyzed. The secondary cooling system is evaluated, the reasons of crack are analyzed. And the solution scheme is obtained. Strand temperature is measured on site in Basteel.

应用仿真软件和实验数据对宝钢1930铸机进行了仿真计算，分析了拉速、配水制度、过热度对铸坯温度场和坯壳厚度的影响；对宝钢1930铸机的二冷制度进行了评估，分析了产生裂纹的原因；并对二冷制度进行优化，提出了改进建议。

Any case, the element of metal surface temperature shall not exceed the allowable temperature of steel.

任何情况下，元件金属的表面温度不得超过钢材的允许使用温度。

Heating promoted a remarkable decrease in aloin and protein contents depending on temperature and time, higher temperature and longer heating time, more loss.

两种芦荟汁中芦荟苷和蛋白质对热都不稳定，温度越高，稳定性越差。

The stability of aloin decreased with the increase of temperature and heating time. However, the absorbency of aloin did not change with time under room temperature (20℃). The aloin was sensitive to light, and the aloe juice showed a yellowish green sediment in 2 hours after exposed to sunlight. The stability of aloin declined when the pH value arose. The aloe juice was more stable under lower concentration of sodium chloride and sucrose.

结果表明：加热的温度越高，时间越长，芦荟苷的热稳定性越差，而在室温下(20℃)芦荟苷的吸光度基本不随时间改变；芦荟苷具有光敏性，在太阳光照射下，2小时后便出现黄绿色沉淀物；芦荟溶液随着pH的升高，其稳定性下降；低浓度的氯化钠和蔗糖对芦荟汁液稳定性的维持比高浓度的效果明显。

The temperature of the reference object must not be too close to the ambient temperature for this to work either.

引用对象的温度不能太关闭，环境温度为其工作之一。

Ambient temperature and temperature of medium must within the range:-40～70℃.

环境及工件介质温度应不超过-40～70℃。

The results show that caramel produced by liquefaction of high temperature, saccharification of low temperature and ammoniation of ammonium sulfate has excellent colour rate and high p roduction efficiency.

本文就是对采用甘薯淀粉生产焦糖色素的工艺进行研究，用正交实验法确定了在高温液化、低温糖化和硫酸铵氨化的条件下生产出的焦糖色素色率好、收率高。

Compared with traditional insulation pot, cup product AMORETTO Electric Car Cup will have a more accurate temperature insulation function, lower power consumption boiling temperature control and intelligent human characteristics.

相对于传统的保温壶、杯产品AMORETTO车载电热杯拥有更准确定温保温功能、更低的功耗以及智能沸点温度控制的人性化特点。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。