交换

A new method to fabricate TM pass polarizers by introducing zig zag shaped proton exchanged regions adjacent to a Ti diffusion waveguide on X cut, Y propagation lithium niobate is presented.

提出了用扩钛和质子交换相结合的方法在x-切，y-传的LiNbO3衬底上制成TM通集成光波导偏振器的新方案，即在扩钛波导两侧的适当位置引入锯齿形的质子交换区。

The results show that, with the increase in ionic strength, the adsorbed amount of taurine on the resin D290, the distribution coefficient λ and the fraction of zwitterion Tau(superscript ±) all decrease, while the pH value of the solution at the equilibrium and the content of anionic taurine Tau(superscript -) increase. Moreover, it is found that, at a certain taurine concentration, the increase in ionic strength may improve the selectivity of the anion resin for taurine.

研究结果表明：(1)随着溶液离子强度的升高，阴离子树脂对牛磺酸的平衡交换吸附容量逐渐降低，牛磺酸在树脂上的分配系数λ逐渐下降；(2)随着溶液离子强度增大，达到平衡时液相的pH值升高，溶液中牛磺酸阴离子Tau含量迅速增加，而牛磺酸两性离子Tau含量迅速降低；(3)在一定的牛磺酸浓度范围内，溶液离子强度增大，有利于提高离子交换树脂对牛磺酸的选择性。

Mass transport ; Isotope exchange ; Exchange mechanism ; Flow geometry ; Advective cooling

质量传输；同位素交换；交换机制；流动几何学；平流冷却

The modified NaY including CeY, CeY, CuY, AgY, KY, MgY and SrY were applied to adsorb thiophene and benzene. CeY is the most highly selective sorbent with high adsorption capacity than other sorbents.

在NaY离子交换过程中采用微波法加热，这使得Y型分子筛具有较高的离子交换度，解决难以制得吸附容量和选择性均高的吸附剂的问题。2。

335 Alkalescent ion exchange resin was used in the exchange adsorption of high concentration of copper ion in wastewater from phthalocyanine green production.

采用335弱碱性阴离子交换树脂交换吸附酞菁绿废水中高含量的铜离子。

It was found that the alkoxy of the aluminium alkoxide can be exchanged to the arkoxy of the raw material or product in the process of reaction. The alcohol producing in the exchange reaction reduces the yield of furan phenol by the further by-reaction of the alcohol with the raw material or product.

结果表明，醇铝在催化单醚合成呋喃酚过程中，醇铝中的烷氧基与原料单醚和产物呋喃酚的芳氧基发生了交换，交换生成的醇与单醚或呋喃酚发生副反应降低了呋喃酚收率。

Keywords amidoxime fiber;anion-exchange fiber;thiocyanate ion;exchange property

偕胺肟纤维；阴离子交换纤维；硫氰酸根离子；交换性能

Chelate fiber with amidoxime group,which is obtained from chemical modification of PAN fiber,is treated with mercury nitrate to prepare anion-exchange fiber.The optimum conditions of the anion-exchange fiber absorption of the thiocyanate ion,such as ion concentration,time,the pH value were studied.

以聚丙烯腈纤维进行NH2OH化学改性制得的含有偕胺肟基的螯合纤维为原料，经Hg(NO3)2化学处理，制得阴离子交换纤维；并以硫氰酸根离子为研究对象，系统地探讨和研究了阴离子交换纤维吸附硫氰酸根离子的最佳条件参数：离子浓度、时间、pH值等。

But this thing can not be bagatelle, what normally this kind of situation states Baidu may want to do it to my station is augural, site still does not have a lot of to exchange what friendship links to not be willing to stand with me to the consequence of home page exchange a link.

但是这事可不是小事，通常这种情况表示百度可能要对我站下手的前兆，site不到首页的后果还有很多交换友情链接的不愿意和我站交换链接了。

Given the current complexity of industrial recovery of 3'-methyl-2'-butenyl 3, 3-dimethyl-pentenoate and the decomposition problems with 2-methyl-1-butene, research was conducted on a process for direct recycling of MBDP involving an ester exchange reaction of MBDP with either methanol, trimethyl orthoacetate, or solutions of methanol and trimethyl orthoacetate.

针对目前工业上回收3，3-二甲基－4-戊烯酸－3'-甲基－2'-丁烯酯工艺复杂、异戊烯大量分解问题，研究了MBDP直接返回循环使用工艺，MBDP与甲醇、原乙酸三甲酯或与甲醇原乙酸三甲酯混合溶液进行酯交换反应的回收新工艺，比较了四异丙基钛酸酯、甲醇钠、氢氧化钾用作酯交换催化剂的效果，筛选出回收MBDP&一锅煮&最佳工艺：按照n：n：n：n＝1.0：9.8：9.2：0.05物质的量比投料，74℃~78℃反应21h，MBDP转化为贲亭酸甲酯和异戊烯醇，单程转化率87.7%，用85%的磷酸中和甲醇钠，蒸出甲醇，直接用于合成贲亭酸甲酯。

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％。