链

In the presence of NaH and in DMF, the acyclic crown ethers 1a and 1b were synthesized by the reaction of di-or triethyleneglycol ditosylate and o-methoxymethoxybenzyl alcohol, which was obtained from salicylaldehyde via the protection of the hydroxyl group with chloromethyl methyl ether followed by the reduction of the formyl group with NaBH4. The hydrolysis of 1a and 1b with dilute hydrochloric acid provided the diphenolic type acyclic crown ethers 2a and 2b respectively in good yield.

将水杨醛与碱和氯甲基甲基醚反应，再经过NaBH4还原，即制得邻苯甲醇，然后将其在DMF中与NaH和二甘醇二对甲苯磺酸酯反应，得开链冠醚1a和1b.1a和1b经稀酸水解，即脱保护而分别生成新的酚型开链冠醚2a和2b。

In this system,the VVVF(variable voltage variable frequency) control method based on magnetic flux trajectory is applied.In the system,it is the target for the magnetic flux linkage polygon to be greatly approximate to the ideal magnetic flux circle.Considering such limitations as the low speed torque ripple,high speed real time and the working frequency of switching element,through the subsection synchronization control method by applying different numbers of magnetic flux linkage polygon for different frequency range,the perfect precision specifications for speed can be obtained.

系统采用基于磁通轨迹法的他控式变频调速方案，以磁链多边形尽量逼近理想磁通圆为目标，并考虑低速转矩脉动、高速实时性和开关元件的工作频率限制等约束条件，通过采用分段同步控制方式，在不同的频段采用不同的磁链多边形边数，使系统获得了优异的转速精度指标。

Both values of K g and fold surface free energy σ e of the copolymer are higher than those of the PLLA homopolymer, which suggests that the crystallization behavior of PLLA is affected by the presence of PEG block, nucleation being more difficult in the case of the copolymers.

共聚物的 K g和链折叠自由能σ e都比均聚物的文献报道值高，表明PEG链段的存在影响了PLLA的结晶，使得其成核较均聚物困难。

Also, maybe the worst gaffe you can make is to include phrases in website like "Buy 5 PR links for $10"or any other hint that you are selling links.

另外，也许最严重的失言你可以是：在网站的词组如"买10元5公关链接"或其他任何提示，你是销售链接。

Arafand T-, 1,6-, 1,3,6-, 1,4-, 1,4,6-D-Galp were linked as arabinogalactan, galactan and arabinan, which were the mainly constitution of the branch.

由T-，1，5-，1，3，5-Araf和T-，1，3-，1，3，6-，1，4-，1，4，6-D-Galp聚合形成的阿拉伯半乳聚糖、半乳聚糖以及阿拉伯聚糖是ASP3侧链的主要组成，通过Rhap残基的O-4位与主链相连。

DGalp and T, 1, 2-, 1, 3-, 1, 5-, 1, 2, 5-, 1, 3, 5-Araf are linked as arabinogalactan type I , arabinogalactan type Ⅱ, galactan and arabinan at the cite of O4 of Rha in the form of the side chain.

由T-、l，6-、1，3，6-、1，4-、1，4，6-DGalp和T-、1，2-、l，3-、1，5-、1，2，5-、1，3，5-Aaraf聚合成的AGI型阿拉伯半乳聚糖、AGⅡ型阿拉伯半乳聚糖、半乳聚糖以及阿拉伯聚糖，构成了HAM-3-Ⅱb-Ⅱ的侧链部分，通过Rha残基的O4位与主链相连。

A landsman could hardly have worn this garb and shown this face, and worn and shown them both with such a galliard air, without undergoing stern question before a magistrate, and probably incurring fine or imprisonment, or perhaps an exhibition in the stocks.

珠儿立刻用巧妙的手法把金链绕在颈上和腰间，使人看上去觉得那金链本来就是她的一部分，难以想象她怎么能够没有它。"你妈妈就是那边那个戴红字的女人吗？"

This system can change the synthetic wavelength chain according to the distance to be measured. The inphase state of the interference signals, which is difficult for phase measurement, can be avoided by changing the wavelength freely. In addition, this system can realize the dimension calibration between the workpiece and the gauge block at a shortest measuring chain.

该测量系统可以根据待测距离选择合成波长链完成由粗测到精测的过程、通过波长的调谐能够避免零相位的测量，并在测量链最短的情况下实现了被测量和量块的直接比对，适用于孔径、平行平面间距的测量。

The abc are to get the generic "default parameters" for use in the comparison program CONTRAST which aligns protein sequenes based on their 3D-structure, to confirm the efficiency of the differential -geometric representation of protein backbone by comparing 3 different algorithms of the curvatures and tortions, and tO find apropriate gap penalty function.

中国科学院上海生物化学研究所，上海 200031摘要：继前面的工作把测试蛋白从三族扩大到十一族，寻求联配参数的普适"缺省值"；比较不同的主链曲率和挠率的计算方法，进一步确认主链的折线线分几何刻划方法的有效性；寻找有效的可变缺失突变惩罚函数的形式。

The study has shown:(1) With increasing sediment depth and the woody giblets, the total organic carbon, the extraction of benzene , the total humic acids and the unhydrolyte are enhanced, while the hydrolyte is decreasing.(2) According to the GC-MS analysis, n-alkane,n-alkan-2-ones and n-alkanones are composed mainly of long-chains,such a result is thought to be characteristic of a herbaceous input from 2300a.B.P. n-alkanones exist in the samples may be considered as the evidence of microorganisms activity.(3) It is showed that the lipids is more sensitive to the climate change than the floristic. The proxy of the pollen spore of the peat stratum is different from the normal environment proxy. It is one of the main reasons that the sensitivity difference of the bog vegetation reacting to the climate isn't accordant with the log of the fat molecule fossil and biology fossil.(4) The transformation of the peat organic carbon is under the influence of temperature,acidity,organic material constituting, etc, and it showed the up-trend with the depth. In the short-term scale, the conversion of the peat organic carbon is effected by seasonal water,regional climate and vegetations; while in the long-term scale, it is controlled mainly by the climate.(5) According to the comparing the orderliness of organic compound,vegetation giblets with the depth to the characteristics of the peat molecule fossil with the section, in the development of this peatmire, 1500a B.P（210cm）is regard as the borderline of the late Holocene, the keynote of the front period is warm with several cold fluctuations, and the trend of the back period is dry and cold although there were several fluctuations.

研究表明：（1）随深度的增高及植物残体中木本残体的增多，总有机碳、苯萃取物、总腐植酸、不被水解物含量逐渐增高，而易水解物含量减少；（2）GC- MS分析显示，正构烷烃，直链烷基2-酮和正烷醇均以长链组分为主，揭示了该泥炭柱剖面2347a.B.P的母源输入以草本植物为主；甲基酮类和短链正烷醇的存在是微生物活性很大的生物证据；（3）通过有机分子标志物与孢粉、植物残体等指标的对比研究表明：脂类化合物对气候变化的反映要比植物种灵敏得多，不同沼泽植物对气候变化的敏感性的差异是脂类分子化石记录与生物大化石结果很难一致的主要原因之一；（4）泥炭有机碳的转化受到温度、酸度、有机物质组成等很多因素的影响，短时间尺度，泥炭有机碳的转化受季节性降水、地方气候和植被等因素的影响；长时间尺度，泥炭地有机碳的转化，受气候条件控制；（5）总结泥炭分子化石特征、泥炭有机质各组分含量及植物残体组成随深度的变异规律，分析结果显示该泥炭地层形成过程中，1500a B.P（210cm）可作为划分前后晚全新世的界线，前期的基调是气候偏暖，但又有几次偏干冷气候的反复，后期气候以干冷为主，其间虽有几次上升波动，但整体趋势不变。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。