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Now, a convenient, efficient pinacol coupling of aldehydes mediated by zinc in good yields has been carried out in ammonia water in the presence of a little crown ether. Adding a small amount of crown ether was highly effective to enhance the yields of pinacol from 63% to 84%.

本文报道一种简便、有效的水相呐偶合反应，它是在含有少量冠醚的稀氨水溶液中，使用锌粉促进醛基化合物进行水相呐偶合反应，其中加入少量的冠醚有助于提高反应的产率，呐醇产率由63%提高到84%。

Then the cyclocarbonylation of propargylic alcohols under the catalysis of Pd 〓 with CuBr〓 and BQ was studied. Due to the high activity the yields of -α-bromoalkylidene-β-lactones were lower than that of -α-chloroalkylidene-β-lactones while the coupling reaction of -α-bromoalkylidene-β-1actones (i. e. Sonogashira and Suzuki coupling reaction) was quite smooth to afford the products in high yields.

接着我们研究了炔丙醇在Pd〓-CuBr〓-BQ催化体系下的羰基插入环化反应，由于-α-溴代亚烷基-β-内酯环化合物的活性高于-α-氯代亚烷基-β-内酯环化合物，导致反应收率偏低，而同样基于此原因，-α-溴代亚烷基-β-内酯环化合物的偶联反应进行得很顺利，而且收率很高。

Photolysis of paramethyl benzyl manganese pentacarbonyl5Mn-p-CH2C6H4CH3 (4a)and paramethoxy benzyl manganese pentacarbonyl5Mn-p-CH2C6H4OCH3(4b) with 1-2 equivalents of R3SiH in C6H6 or C6D6 at 5℃ yields the silyl manganese pentacarbonyls5MnSiR3 [SiR3 = SiMe2Ph (1b), SiMePh2 (1c), SiPh3 (1d), SiHPh2 (1e), SiEt3 (1f), SiMe2tBu(1g), and SiMe2Et (1h) ] in moderate to high yields after chromatographic purification.

对甲基卞基五羰基锰5Mn-p-CH2C6H4CH3（4a）或对甲氧基五羰基锰5Mn-p-CH2C6H4OCH3（4b）与1-2当量R3SiH的C6H6 或C6D6溶液在5oC光解，经色谱纯化后得到中等或高收率硅烷基五羰基锰5MnSiR3［SiR3 = SiMe2Ph（1b），SiMePh2（1c），SiPh3（1d），SiHPh2（1e），SiEt3（1f），SiMe2tBu（1g），和SiMe2Et（1h）］。

As for the tripodal ligand DBIMPY, its lanthanide complexes includingantipyrine have higher emission quantum yields than others, and its nitrate-coordinated series have higher emission quantum yields than those of the chlorideseries in 〓.

2对于三脚架配体DBIMPY，在〓溶液中，其含安替吡啉的稀土配合物有相对更高的量子产率，并且其稀土硝酸盐配合物比相应的稀土氯化盐配合物有更大的量子产率。

The results indicate that in the synchronizing condition the MRF is unyielded, every point of MRF in the flow field has the same angular velocity. Under the slipping condition, with the increase of magnetic field or the decrease of slip speed, MRF may transfer from whole yield to partial yield. When the MRF wholly yields, the angular velocity of MRF increases nonlinearly with its radius, the non-linear distribution becomes more obvious as the magnetic intensity in the working gap increases. When the MRF partially yields, the yield region expands with the decrease of magnetic intensity or the increase of slip speed and the unyield region always reaches the driven rotor. The transfer torque of MRTD increases with the increase of the external magnetic field, but the transfer torque maintains a constant value approximately with the variation of slip speed at the same magnetic intensity.

研究结果表明，在同步工况下，传动装置流场中磁流变液未屈服，各点角速度相同；在滑差工况下，随外加磁场的增大和滑差转速的减小，磁流变液逐渐从完全屈服向部分屈服转变；磁流变液完全屈服时，磁流变液角速度随半径呈非线性增加，工作间隙中磁场越强，流场的非线性分布越明显；磁流变液部分屈服时屈服区域随外加磁场的增大而减小，随滑差转速的增大而增大，未屈服区与主动转子相连；稳态下磁流变传动装置传递的转矩随外加磁场的增加而近似呈线性增大，但在相同外加磁场下，传递转矩基本不随滑差转速改变而改变，表现出良好的恒转矩特性。

Maize silage can be utilized in the form of whole ensiling and cereal＆silage maize using, many breeds of maize silage have high biomass yields and grain yields, optimum of benefit will determine the value of extension and utilization.

青贮玉米有整株青贮和粮饲兼用两种主要利用方式，一些通过审定的青贮玉米品种具有生物产量和子粒产量均较高的特点，而实现经济效益最优最终决定青贮玉米的推广和应用价值。

The experimental result showed that with the increase of weight ratio of catalyst to oil,yields of off-gas,liquidized petroleum gas and coke increased,but yields of gasoline and diesel oil dropped;conversion of FCC gasoline was about 94% and its yield firstly decrea...

实验结果表明，随着剂油比的提高，干气、液化气和焦炭收率逐渐增大，汽油和柴油收率逐渐减小，产品的转化率在94%左右，且随着剂油比的升高转化率先减少后增加，当剂油比为14.67∶1时，产品的转化率有最小值；MON和RON随着剂油比的升高而先增加后减少，当剂油比为6.03∶1时，产品的MON和RON有最大值，分别为83.50%和96.83%；随着水油比的加大，汽油、柴油和焦炭收率与产品的MON和RON逐渐减少，干气和液化气收率变化不大，而&兰炼&FCC汽油的转化率在94%左右。

A new cultivar for high temperature tolerance can be developed by the method during cotton breeding program to stabilize yields for consistently high yields in the present cotton-producing environment and in the future warmer climate.

采用该方法，能够将耐高温性状引入育种目标，培育出耐高温和高产的棉花品种，以适应当前的植棉环境和将来变暖的气候条件。

Fishtail palm of India to Malay Peninsula sap yields a brown sugar jaggery and trunk pith yields sago .

印度到马来半岛出产的棕榈，；树汁出产一种红糖，树干的木髓出产西谷米。

The older liquid-fuel missiles carry single warheads with yields estimated at 3.3 MT. The newer solid-fuel missiles have single warheads with maximum yields of a few hundred kilotons each.

早期的液体燃料导弹携带一枚当量大约为330万吨的核弹头，新型的固体燃料则装备一枚最大当量为数十万吨的核弹头。

If you were not , and OS X just booted normally, have no fear.

如果你没有，和OS X刚刚启动通常，没有恐惧。

I only want to preserve our all .

我只想保存好我们的一切