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The second reaction we tested was diastereoselective Michael-Aldol annulation of -keto ester 121 with methacrolein to give a key intermediate for synthesizing (--Huperzine A.

通过对反应条件的筛选，我们得到的最好的结果是以-乳酸苄酯为手性辅基的β-酮酯121i为底物，以(1R， 2R)-环己二胺衍生的手性胍85i为催化剂，以无水四氢呋喃为溶剂，在-20℃反应，得到的产物的de值为73.2%。

The overcutting on tool end is checked via comparing the tool radius with the circumradius or the radius of inscribed circle, and the touch interference of tool body based on the symbol of the vector distance from the triangle vertex to the tangent plane of tool body column.

在曲面加工的无干涉路径规划中，通过恰当选择刀具初始位置避免了接触点处的曲率干涉；通过比较刀具半径与曲面上三角片外接园半径的大小即可判断刀具底面干涉；而根据三角片顶点与刀杆切平面的有向距离的正负来判断刀杆碰撞干涉。

Now if these princes had been as a Trajan, or a Marcus Aurelius, a man might have thought that this had proceeded of an abundant goodness of nature; but being men so wise, of such strength and severity of mind, and so extreme lovers of themselves, as all these were, it proveth most plainly that they found their own felicity (though as great as ever happened to mortal men) but as an half piece, except they mought have a friend, to make it entire; and yet, which is more, they were princes that had wives, sons, nephews; and yet all these could not supply the comfort of friendship.

假如这些君王是图拉真或马喀斯。奥瑞利亚斯一流的，那末我们可以认为像上述的举动乃是出自十分良善的心田的；但是这些君王都是很有智谋，精神强健而严厉，并且是极端爱己的，然而他们竟然如此，这就可以证明他们底幸福虽然已达人间之极峰，但是他们对之，仍不满意，觉得若无朋友使之圆满，则这种幸福终是残缺不全也。犹有甚者，这些君主都是有妻有子有甥侄的人，然而这些人竟不能使他们有朋友之乐

Now if these princes had been as a Trajan, or a Marcus Aurelius, a man might have thought that this had proceeded of an abundant goodness of nature; but being men so wise, of such strength and severity of mind, and so extreme lovers of themselves, as all these were, it proveth most plainly that they found their own felicity (though as great as ever happened to mortal men) but as an half piece, except they mought have a friend, to make it entire; and yet, which is more, they were princes that had wives, sons, nephews; and yet all these could not supply the comfort of friendship.!

假如这些君王是图拉真或马喀斯·奥瑞利亚斯一流的，那末我们可以认为像上述的举动乃是出自十分良善的心田的；但是这些君王都是很有智谋，精神强健而严厉，并且是极端爱己的，然而他们竟然如此，这就可以证明他们底幸福虽然已达人间之极峰，但是他们对之，仍不满意，觉得若无朋友使之圆满，则这种幸福终是残缺不全也。

Now if these princes had been as a Trajan, or a Marcus Aurelius, a man might have thought that this had proceeded of an abundant goodness of nature; 8ttt8.com being men so wise, of such strength severity of mind, so extreme lovers of themselves, as all these were, it proveth most plainly that they found their own felicity (though as great as ever happened to mortal men) 8ttt8.com as an half piece, except they mought have a friend, to make it entire; yet, which is more, they were princes that had wives, sons, nephews; yet all these could not supply the comfort of friendship.

假如这些君王是图拉真或马喀斯·奥瑞利亚斯一流的，那末我们 sSBbWw 可以 www.ssbbww.com 认为像上述的举动乃是出自十分良善的心田的；但是 dddTt 这些君王都是很有智谋，精神强健而严厉，并且是极端爱己的，然而他们竟然如此，这就可以 www.ssbbww.com 证明他们底幸福虽然已达人间之极峰，但是 dddTt 他们对之，仍不满意，觉得若无朋友使之圆满，则这种幸福终是残缺不全也。犹有甚者，这些君主都是有妻有子有甥侄的人，然而这些人竟不能使他们有朋友之乐。

The properties of TCC with ATS were as good as the TCC with HTS, better that the requirement of standard GB8744-88 for semi-graphitic carbon block. As good as TCC with HTS in industrial cells, the TCC with ATS also reduces the sodium penetration to cathodic lining, no tear-off of the coating was found after starting up of the cells. As compared with reference cells, the operation of coating cells with ATS was also improved to keep good shape of cell chamber, reduce the formation of sludge on the cell bottom, and gain more uniform current distribution. The ohmic drop of TCC cell bottom was lessened by 11. 5mV. The current efficiency was increased by about 1. 48% in average. It was estimated that the TCC life could be 44 months. Obviously, the TCC with ATS could also improve the performance of industrial cells, save energy, and increase the cell life.

对常温固化涂层槽的考核表明，与高温固化涂层槽一样，阴极内衬对钠的吸收减少，钠渗透速度减缓，从而减小钠膨胀危害，减少了铝电解槽早期破损的几率；启动后，常温固化涂层不脱落，同样具有良好的粘接性能；与对比槽相比较，常温固化涂层槽正常生产后，阴极表面干净、光洁，无沉淀或结壳，炉膛规整，阴极、阳极电流分布均匀，炉底压降降低（平均降低11.5mV），电流效率提高（平均提高1.48％）；涂层在电解槽内存在的时间可达到44个月以上；常温固化涂层同样可以起到改善电解槽工作状态、节能降耗、延长槽寿命的作用。

The properties of TCC with ATS were as good as the TCC with HTS, better that the requirement of standard GB8744-88 for semi-graphitic carbon block.AbstractAs good as TCC with HTS in industrial cells, the TCC with ATS also reduces the sodium penetration to cathodic lining, no tear-off of the coating was found after starting up of the cells.As compared with reference cells, the operation of coating cells with ATS was also improved to keep good shape of cell chamber, reduce the formation of sludge on the cell bottom, and gain more uniform current distribution. The ohmic drop of TCC cell bottom was lessened by ll.SmV. The current efficiency was increased by about 1 .48% in average. It was estimated that the TCC life could be 44 months.Obvi

对常温固化涂层槽的考核表明，与高温固化涂层槽一样，阴极内衬对钠的吸收减少，钠渗透速度减缓，从而减小钠膨胀危害，减少了博士学位论文摘要铝电解槽早期破损的几率；启动后，常温固化涂层不脱落，同样具有良好的粘接性能；与对比槽相比较，常温固化涂层槽正常生产后，阴极表面干净、光洁，无沉淀或结壳，炉膛规整，阴极、阳极电流分布均匀，炉底压降降低(平均降低11.smv)，电流效率提高(平均提高1.48%)；涂层在电解槽内存在的时间可达到44个月以上；常温固化涂层同样可以起到改善电解槽工作状态、节能降耗、延长槽寿命的作用。

UB-218 are designed to be mainly used as the adhesive or filling of acryl, PE, PC, PVC; and also can be used as the adhesive of copper, iron, aluminum, zinc, tin and etc; as well a good adhesive of PP adheres to PP, glass adheres to epoxy resin and printing circuit plates of various materials. It must satisfy the latest environment protection requests, UL standard and other requests raised by our customers.

UB-218 主要设计目的是开发一种对底材无腐蚀、粘接力强、适用范围广、符合最新环保和安规要求的通用型工业接着剂，它的主要用途是压克力﹑PE﹑PC﹑PVC的接着及填充；也适用于铜﹑铁﹑铝﹑锌﹑锡等的接着，以及PP对PP﹑玻璃对环氧树脂板及各种材质之印刷电路板的接着与固定。

The molecular weight of dextransucrase measured by SDS-PAGE was 170 kDa ,which was similar to the enzyme from Leuconostoc mesenteroides. The enzyme had an optimum temperature between 25and 30℃ and an optimum pH of 5.4. It was relatively stable in the range of pH 5.0 to 7.0, but the stability declined rapidly as soon as the temperature rose over 35℃.

以蔗糖为底物，酶促反应的最适温度为25～30℃，最适pH值为5.4，动力学常数Km值为10.43 mmol/L；酶活在pH 5.0～8.0较为稳定，在室温（25℃）保藏4 天仍有59%的酶活力，4℃保存7周酶活力仅下降一半，但在35℃以上失活很快；Ca2+对催化作用有较大的促进，Mg2+有微弱的促进作用，K+对催化反应无影响，Cu2+的抑制作用最强。

This trifecta of a springy sockliner, dense CMEVA midsole and adiPRENE + at the forefoot works very well and I did not feel any degradation in cushioning performance through my five test wearings of the T-Mac.

弹性的内衬，厚实的CMEVA外底和前掌的adiPRENE +的三沉劣势做得很好，正在我穿灭the T-Mac的五次测试外我也没无感觉任何缓震表现的减分。

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。