地方法

An algorithm based on operation times (T_0) of zero voltage space vector is presented. The d-axis current can be derived from the PI controll er, whose inputs are T_0 and one constant T_0*.

与普通弱磁方法相比，该方法有效地避免了电机参数变化对控制精度的影响，在加快动态响应速度的同时，降低定子电流的幅值。

The difference is discussed in the paper and a novel PMSM DTC system based on the fuzzy distribution of zero voltage vector strategy is proposed at last. Simulation results show that the new method decreases the torque ripple after using zero voltage vectors properly.

论文分析了零电压矢量在永磁同步电机直接转矩控制系统中的作用，并提出了一种基于模糊零电压矢量分配策略的永磁同步电机直接转矩控制方法，仿真结果表明该方法有效地利用零电压矢量达到了减小转矩脉动的目的。

This thesis studies a widely used first order optimzation algorithm--Sequential Linear Programming method, SLP is modify so that it can solve structural and shape optimization problems more efficiently, including continuous and dsicrete variables problems. Finally the zeroth order optimization method is presented for two dimensional shape optimization problems.

本研究将从一般广为设计者所采用的一次最佳化方法--线性序列规划法的修正研究，以使其更稳定且更有效率地解决在一般结构与形态最佳化问题，包含有连续式及非连续式设计变数的最佳化问题演算过程，最后应用零次最佳化方法概念在二维形态最佳化设计上。

In light of the single fuzzy control, the dissertation sets forth the adaptive fuzzy control strategies of the temperature of melting zone and the temperature stability of the second chamber.

结合基本模糊控制方法，创新性地提出了城市生活垃圾熔融区温度和第二燃烧室温度模糊自适应控制策略，研究了模糊自适应控制策略在密闭式城市生活垃圾直接气化熔融焚烧过程中的设计与应用方法。

So, the aromaticity of acenaphthenyl groups in C_2 gum should be the least. In order to explain the reason, quantum chemical calculation is utilized. The optimized geometrical structrures of condensed aromatics in C_1 gum, C_2 gum and C_3 gum are calculated at B3LYP/6-31G* levels. We find that some phenyl groups in acenaphthenyl groups are coplanar and have the largest conjugated structure.

为了解释其原因，我们利用量子力学方法进行了计算，研究了三种稠环基团在B3LYP／6-31G*基组水平下优化得到的几何结构，发现苊式多苯基苯基中的萘环和中间的苯环共面，电子离域性最大，而其他二者所有苯环都不共面，发生了明显地扭曲；同时，在优化几何结构的基础上，对三种化合物进行了前线分子轨道的分析，利用密度泛函理论方法(density function theory，DFT)计算了稠环基团的最高占有轨道和最低未占轨道之间的能量差，即能隙，发现C_2胶上苊式多苯基苯基的Eg最小，解释了C_2胶具有最好的辐射保护效果的原因。

objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量。方法：采用固定相为二乙烯苯乙基乙烯苯型高分子多孔小球（直径为0.18 mm～0.25 mm），氮气为载气，用外标法测定乙酰乙酸乙酯中残留丙酮的含量。结果：该方法在丙酮浓度范围在25 μg/ml～400 μg/ml内呈良好的线性关系，响应曲线相关系数为0.996，平均回收率为96.8%。结论：本法简便，快速、实用，灵敏度高，可有效地用于乙酰乙酸乙酯的质量控制。

Methods Using Aerophone Ⅱ Model 6800 and Visipitch 6097, vital capacity was recorded first , then the simultaneous phonation volume, maximum sustain phonation time,mean airflow rate,sound pressure level and average pitch were recorded in order to induce the relation of phonation and respiration in normal subjects.

方法应用空气动力学方法，使用嗓音功能分析仪(Aerophone ⅡModel 6800)和可视音调仪(Visipitch 6097)，先记录下受试者的肺活量，再嘱受试者在自然舒适的音调和声音强度下，尽可能长地发元音／a：／，同时记录最长发声时间、平均气流率、平均音调、声音强度、发声气容量，从而推断呼吸与发声的关系。

The liquid heating and allopatric temperaturemeasuring method were adopted in the technology in order to heat the two sides of specimen with NWAS evenly and keep the temperature difference constant, and to measure the temperature of the two sides of the specimen.

该技术创造性地采用了液流加热以及异地测温的新方法，成功地解决了对微米厚度的一维纳米线阵列结构热电材料试样两侧均匀加热并保持两侧的温差恒定，以及微米厚度的试样两侧测温的难题。

On the base of study on arbuscular endomycorrhiza of Alnus of Changbai Mountain and nitrogen-fixing woods of Northeast of China, the paper attempted to reveal the DNA molecular polymorphism of the symbiotic arbuscular endomycorrhizal fungi for the effect that make better use of the fungi resource.

本项研究利用分子生物学技术和研究方法对中国吉林长白山地区非豆科固氮植物以及东北地区固氮树木的丛枝菌根真菌DNA分子多态性及其与宿主植物之间的相互关系等进行初步研究，旨在利用分子生态学理论和研究方法揭示丛枝菌根真菌多样性及其与宿主植物之间相互适应和协同进化的一般规律，为更好地保护和利用这一重要的微生物资源提供理论依据。

And then the author discussed the theory of Co-occurrence analysis, including its definition, category, methodology and the common annalistic procedure.

并从理论上深入探讨了共现分析方法，系统地总结了该方法的定义、类型、方法论基础及一般研究流程。

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。