查询词典 direct method

The affections on the yield of DLLA caused by catalyst, temperature and time etc. were studied. By using ethylene glycol as diluent, the distillate temperature of DLLA was lowed and the carbonization phenomenon could be avoided, which caused the yield of DLLA increasing from 36.8% to 51.3%. The molecular weight of PDLLA prepared by this method could reach 184,000. DLLA and PDLLA was characterized and analyzed by DSC, XRD and IR.The key of direct method to synthesize PDLLA is the exclusion of H2O from reaction system.

丙交酯开环聚合制备PDLLA的关键在于中间体D，L-丙交酯的制备，研究了催化剂、反应温度、反应时间等因素对DLLA产率的影响，通过在反应体系中加入稀释剂乙二醇，DLLA的馏出温度明显降低，避免了DLLA在蒸馏过程中产生碳化现象，并使DLLA的平均产率由36.8％提高至51.3％，制备的PDLLA分子量最大值达18.4万。

A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.

文摘：用比较直接的方法证明幂级数的和函数在收敛域内可以逐项微分的公式；并得到了计算傅立叶系数的一种简便方法。

The metastable state of dilution of spectinomycin has been studied by both induction period method and direct method.

采用诱导期法和直接法研究了大观霉素溶析结晶的介稳态。

Meanwhile "center line" method is carried on in the foundation of "direct method" to reduce the errors caused by the subjective factors in the process of mensuration, for the measure off the stage of economical cyclical.

同时为减少测定过程中由主观因素所导致的差异，在"直接法"的基础上，结合"中位线"划分法来进行经济周期的阶段划分。

We compared the direct method of emulsigying sponge cake with the secondary method of emulsifying sponge cake .

试验对乳化海绵蛋糕制作的一步法与二步法进行了比较。

The difference between the direct method and subtractive method in the determination of TOC is discussed.

研究了水质监测中总有机碳测定时，采用直接法和差减法测定结果的差异，结果表明对于自来水、天然水样和部分污水水样，采用直接法测定总有机碳更准确。

The concordance rate of the two methods was analyzed. RESULTS: The concordance rates of traditional method and direct method in identifying Enterobacteriaceae, Nonfermenters, Vibrionaceae and the Gram positive cocci were 95%, 75%, 67% and 77% respectively.

结果： 直接法与常规法对肠杆菌科的鉴定一致率为95%，对非发酵菌、弧菌科及革兰阳性球菌的鉴定一致率分别为75%， 67%， 77%。

Beijing duck ; Metabolizable energy ; Direct method ; Difference method

北京鸭；代谢能；直接法；差量法

Methods A total of 15 pig tibiae were used to test the cancellous bone porosity, their relative density and the material density with the direct method and the statistical method respectively.

对15根猪胫骨分别采用&直接法&和&统计法&测试松质骨孔隙率或其表观密度和材料密度。

There are two methods of disclosing cash flows from operating activities: the direct method and the indirect method.

披露经营活动产生的现金流量有两种方法：直接法和间接法。

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。