试验设计

Secondly, the operating principle and the mathematical model and the control method about the three-level voltage source high power factor PWM converter are analysed .The generation of the PWM trigging pulse control signal are introduced emphatically. On the basis of this, the hardware experimentation circuits are built with DSP and CPLD, and the trigging pulse signal is generated exactly. The feasibility of the circuit is verified by the experiment result.

其次，分析了三相电压型变流器的原理、模型、控制方法并着重研究其PWM 触发脉冲控制信号发生技术，并以DSP、CPLD 等芯片搭接了硬件试验电路，产生了正确地触发脉冲信号，试验结果证明了设计的合理性。

Based on the destructive test of certain old pre-stressed concrete hollow slab after structural strengthening by CFS,the destructive mechanism and ultimate bearing capacity of old pre-stressed hollow slab after structural strengthening is being researched,which is useful for the strengthening design of old bridge and solvating of single slab problem.

通过某已使用10年的旧桥预应力混凝土空心板受拉区碳纤维布加固后的破坏荷载试验研究，对受拉区加固后的旧桥预应力混凝土空心板的破坏机理、变形性能及极限承载能力等进行了研究，为旧桥预应力混凝土空心板的加固设计及单板受力问题的分析解决提供了试验依据。

The wall sheathings are screwed on cold-formed steel studs, with 12mm gypsum board on one side and 9 mm oriented strand board on another side. Both static and cyclic load tests are conducted for a same size specimen. The purpose is to find the effect on shear strength from different height-width ratio, and to get the shear resistance limit by static and cyclic loading.

同样尺寸的二个试件分别在顶端进行水平单调加载和水平方向低周往复加载抗剪试验一次，试验目的是测试墙体的不同高宽比对抗剪强度的影响以及墙体在单调加载及低周反复加载两种情况下的抗剪强度Pu并做出比较，从而对墙体构造及设计提出改进建议。

Based on the study of model test of post-tensioned prestressed concrete box-shaped beam, the feasibility and correctness of this structure being applied for pillar wharf with bridge crane is tested and verified, which provides reference for calculation of post-tensioned prestressed box-shaped beam of bridge crane design This structure can be applied for port construction at large water amplitude area rationally

港口桥吊后张预应力起重机梁的模型试验研究重庆交通学院王多银陈嘉勤摘要通过对后张预应力混凝土箱梁模型试验研究，验证该结构用于桥吊墩式码头的可行性，寻求预应力桥吊箱梁的理论计算依据，并验证其正确性，为后张预应力桥吊箱梁的设计提供参考计算方法，使该结构能科学

The combustion of coke sampling from a boiler of ethylene plant was studied on a laboratory unit. The effects of combustion temperature and oxygen flow rate on coke combustion were investigated. Four combustion promotors were prepared and added into the coke for proceeding the combustion test.

摘 要：采用国内某乙烯厂余热锅炉生成的焦炭为原料，在自行设计的焦炭燃烧试验装置中，对乙烯装置余热锅炉焦炭的燃烧过程进行研究，考察了温度、氧气流量等主要因素对焦炭燃烧的影响，并研究配制了4种具有良好助燃效果的助燃剂组分进行焦炭催化燃烧试验。

The combustion of coke sampling from a boiler of ethylene plant was studied on a laboratory unit. The effects of combustion temperature and oxygen flow rate on coke combustion were investigated. Four combustion promotors were prepared and added into the coke for proceeding the combustion test.

采用国内某乙烯厂余热锅炉生成的焦炭为原料，在自行设计的焦炭燃烧试验装置中，对乙烯装置余热锅炉焦炭的燃烧过程进行研究，考察了温度、氧气流量等主要因素对焦炭燃烧的影响，并研究配制了4种具有良好助燃效果的助燃剂组分进行焦炭催化燃烧试验。

Still chugging along on its own, it designed experiments to test its hypotheses, and performed them using a fully automated array of centrifuges, incubators, pipettes, and growth analyzers.

它还在依靠自己的方式在努力探索，它为测试它的推断而设计出试验，并且用一系列自动化的配置——离心机、细菌培养器、吸液管和发育分析器——来执行这些试验。

It was found that electrical field strength and potential around the the sample changed less in the fully insulated chamber than in conducting material phytotron, so it is closer the real condition. Based on the design, the first fully insulated large artificial climate chamber in China, in which temperature , humidity, and atmospheric pressure can be regulated, has been built in our laboratory. The paper developed an insulation parameters automatic test system of high voltage capacitive equipment based on LabVIEW. In the chamber, On-line tanδmeasurements of the capacitive transformer bushings were completed. The effects of environmental factors on tanδwere analyzed, and the curves between the tanδand the environment parameters were acquired. Then, a grey relational model to analyze the effects of main environmental factors on tanδwas built, and the grey relational grade between them was gained in this paper.

完成的主要工作和取得的主要研究成果如下：提出了全绝缘型人工气候室设计方案，计算分析了气候室内悬挂绝缘子和套管时的空间电场分布情况，并和金属材质气候室相比较，论证了该方案的优越性，据此方案研制的全绝缘人工气候室可调节温度、湿度和压力等参数，满足了人工气候试验的要求；开发了基于虚拟仪器技术的高压电容型设备绝缘特性自动测试系统，完成了人工气候室内变压器套管tanδ的在线测量试验，以此为基础分析了环境因素对电容型设备tanδ的影响情况，获得了tanδ与环境参数的关系曲线，建立了环境因素对tanδ影响的灰关联分析模型，得到了主要环境参数与电容型设备tanδ的灰关联度。

Based on the model calculation,an FAPP ventilation system was madein Beijing Poultry Breeding Company.Through running test and a series ofphysical and chemical characteristic measurement,the distribution of flowspeed in length,and breadth was given.The average temperatureand rel-ative humidity,the amplitude of T and RH per day of 30 days in winter,and instantaneous T and RH in 24 hours wre measured in FAPP house,com-paring house and outside,the result shew that FAPP ventilation system wassuperior to comparing house.The dust concentration and microrganism con-tent were also measured in the rearing piriod of poultry,the value in FAPPhouse was junior to comparing house.

在模拟结果的基础上，设计了一套FAPP通风系统并在北京市种禽公司原种后备场种雏舍进行了实际运行试验和一系列的理化特性参数的测试，试验给出的正压管道式送风舍纵轴方向及横截面上气流速度的分布规律与模拟结果相吻合；通过对FAPP舍、对照舍及舍外冬季30天的逐日平均温湿度、温湿度振幅以及24小时瞬时温湿度的测试分析，显示了FAPP通风系统在冬季通风中明显优于负压通风系统；在雏鸡全周期的饲养过程中还对舍内粉尘与微生物的含量进行了测试，FAPP舍的值明显低于对照舍，这一结果为FAPP通风系统的推广应用提供了实验依据。

Then, the field test were carried on according to the designed proposal, and the research and the experiment of the key technologies as the drill hole, the powder charge structure and so on had been conducted.

然后，对设计方案进行现场试验，并对钻孔、装药等关键技术进行了研究和试验。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。