醚的

In the process of producing soft urethane polyester foamed plasics,CFCs as forming agent are replaced by cyclopentane whose value of ozone depletion is zero to decrease the destruction of environment,and the modified poly-ether-alcohol is used as reactants through one-step reaction.

为了解决软质聚氨酯泡沫塑料生产过程中的环保问题，采用臭氧消耗值为零的环戊烷为物理发泡剂替代严重破坏臭氧层的氯氟烃，以改性聚醚多元醇与甲苯二异氰酸酯等为主要反应物，一步法反应研制试产了软质聚氨酯泡沫塑料。

Effect of heat treatment on the ndcrophase separation of a segmented poly copolymer based on poly diol, 3, 5 dithyltoluene diandne and 4,4'-diphenylmethane diisocyanate has been studied bymeans of fourier transform infrared spectroscopy.

用傅里叶变换红外光谱方法研究了热处理对由聚环氧丙烷聚醚多元醇、3.5－二乙基甲苯二胺和4，4－二苯基甲烷二异氰酸酯组成的多嵌段聚氨酯脲的微相分离行为的影响。

Similarly, over the last 30 years flame-retardant chemicals known as polybrominated diphenyl ethers have been widely used, although little is known about their broader effects.

类似地，在过去的30年里，像我们知道的多溴二苯醚等阻燃化学药剂也被广泛应用，但我们并不了解它们具有的其他功能。

The π-A isotherms of NC molecules are strongly dependent on the divalent ions in the subphase.

在氮冠醚分子的单层膜中，分子的占有面积依赖于亚相中的离子。

DUX M53 had PPS-43 style safety, located in front of the trigger guard, while M59 had a sliding safety switch on the left side of the receiver, above the pistol grip.

的DUX M53了聚苯硫醚- 43式的安全，防范触发位于前面的，而M59手枪握了安全左侧滑动开关就上述的接收器。

Disease characteristics. Homocystinuria caused by cystathionine β-synthase deficiency is characterized by developmental delay/mental retardation, ectopia lentis and/or severe myopia, skeletal abnormalities (excessive height and length of the limbs) and thromboembolism.

疾病特征：由胱硫醚β-合酶缺乏引起的高胱氨酸尿症的病征是发育迟缓／智力障碍、晶状体异位和／或严重的近视骨骼异常和血栓栓塞。

Polyether is an effective wetting agent, and it can be used in textile dyeing, photographic developing and electrobath.

聚醚是有效的润湿剂，可用于织物的染色、照相显影和电镀的酸性浴中。

In another direction, the radical cyclization of thioimide with acylsilane produced simple cyclization product in low yield without expected enol silyl ether compound.

对於硫醯亚胺与矽基酮的自由基反应，则是得到低产率的简单环化产物，而不是预期的烯醇矽醚化合物。

After methanol is taken out, the research octane number of C5 etherealization product is about 95. The alkene content is less than 35%, the sulfur content is less than 10μg/g and the aromatics content is less than 1%, it is a clean and high quality gasoline component with high octane number.

脱除甲醇后，裂解C5馏分选择性加氢后的醚化产物的研究法辛烷值为95左右，烯烃含量小于35%，硫含量小于10×10^(-6)，芳烃含量小于1%，是一种优质、清洁的高辛烷值汽油组分。

Meanwhile, the dosages of etherification agent and alkali influencing on degree of substitution and reaction efficiency are discussed.

同时讨论了醚化剂用量和碱的用量对取代度和反应效率的影响，确定了合成阳离子淀粉反应的最佳碱催化剂用量为 1%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。