试验方法

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

Objective To assess and design of internal quality control procedures of the coagulation test.

目的 对凝血试验试验项目的质控方法进行评价和设计。

Methods the effects of chromatography, extract method and comminution degree were investigated by the pre-experimental test.

方法预试验考察上柱方法、提取方法、粉碎度对结果的影响。

In the first part, an ideal non-noise spatio-temporal series (33 modes Lorenz system) is used as a generator for chaotic spatio-temporal series in comparison and sensitive tests with the field time series analysis method.

在第一部分中，以一个"理想"的混沌时空序列即33模Lorenz系统，作为时空混沌序列的"发生器"，通过状态空间重构，利用场时间序列的局域近似方法建立预测模型，进行对比试验和敏感性试验。

Based on the theoretical analysis of the test results, considering the cohesion force component of the shear strength, the judgment method of gushing in pit is quantified for the first time and is compared with engineering practice.

在对试验结果进行理论分析的基础上，根据试验的结果考虑基底土层抗剪强度的黏聚力分量，量化地提出软土地基基坑突水的判断方法。

Further provided is a method for alleviating the symptoms of an infection by a Peptide Deformylase expressing microorganism in a subject by administering or delivering to the subject an effective amount of the compound described above.

进一步提供了一种缓解受试验者中受肽去甲酰酶表达微生物感染的症状的方法，它通过对受试验者施用或送递有效量的上述化合物。

In order to study on the problems of cracking similarity conditions and test simulating method of induced joint in structural model test, fracture property tests of material and mechanics theory deducing are presented in this paper.

为了研究诱导缝在结构模型破坏试验中的开裂相似条件和试验模拟方法，进行了材料的断裂特性实验和力学理论推导。

According to the similarity criterion of structural model test, prototype material and model material need to conform to the similarity conditions of fracture property and shear-friction strength.

为了研究诱导缝在结构模型破坏试验中的开裂相似条件和试验模拟方法，进行了材料的断裂特性实验和力学理论推导。

Meanwhile,simulation and pot cultureexperiments were conducted on crops fertilized by them and tests were carried outon the release and transport of nutrients in them and the nutrient uptake andutilization of crops by SEM,Conductometer and EUF(electron-ultrafiltration).

本研究采用电导仪、扫描电镜、电超滤等方法，室内模拟试验和盆栽作物应用试验对我们研制的聚合物包膜尿素和包膜磷铵的膜结构特征、养分释放运移机理和作物吸收利用等方面进行了较系统的研究。

This paper investigated the effects of bamboo vinegar on inhibiting germination of conidiophore in the lab, and controlling downy mildew of cucumber in the field with 'JinYou 30' cucumber (Cucumis sativus L.).

以"津优30"黄瓜为供试作物，主要通过室内抑菌试验与田间防治试验相结合的方法，探讨竹醋液对黄瓜霜霉病的抑制作用。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新