研究与开发

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

With the interaction of central city and its periphery scennic spots, this article analysize and prove the interactions of market positioning, theme imagine, special structure , and product projection beteen central city and its periphery scennic spots through basic principles , support factors, discrepance tactics, and so on.

根据中心城市与周边旅游地的互动关系，结合城市居民出游市场的主要特征，文中还就规划定位的基本原则、支撑要素、差异化策略和互动关系等层次，对中心城市与其周边旅游地的市场定位、主题形象定位、空间结构及产品开发等问题进行了理论分析和实证研究。

Thermal hydraulics: feat systems, noesis agitate sending systems, anti-lock braking systems, cerebration gear, render shot systems, astir support systems, lubrication systems* Gas dynamics: pneumatics, propulsion, sterilization, expose and clean cycles, high-pressure gas, pedal transmission, adsorption, pedal form reactions, HVAC, ECS, multi-species aerosolized systems* Multiphase fluids: refrigeration, air-conditioning, status control, cryogenic piping networks, steam/water systems, or render systems with exotic, vaporific fluids.* Systems curb element and code assessment data acquisition distribution rates, anachronic communication, similarity and digital electronic filters, curb wrap enforcement rates, meshwork (CAN charabanc communication, etc.* Fuel cells: stationary or mobile.* Electrical systems: AC/DC machines, noesis electronics, batteries, etc. Flight dynamics, and curb systems of every kinds including digital filters

MSC Easy5的独到之处在于：其一，强大的控制系统仿真分析能力，可以建立各种复杂的控制系统模型，包含稳态分析、线性系统分析、频域响应、根轨迹分析等完整的控制系统分析类型；其二，多学科专业应用库，借助专业应用库中的预定义模型元件，向用户提供独一无二的建立系统级模型和研究多学科系统耦合问题的能力；其三，卓越的代码生成和求解器，可以由图形化系统模型自动生成相应的FORTRAN或C源代码，这些代码可以通过编译生成可执行程序，并可被用户调用；其四，高效的高级建模和二次开发功能，方便用户创建用户化模型元件，并可调用外部FORTRAN或C子程序；其五，与其它CAE软件良好的集成能力，可以将不同CAE软件所建立的模型集成到MSC Easy5中建立完整的虚拟样机，是真正的协同仿真平台。

The research fields of Resources science are those: character of each resource, space structure and distributing rules, exploitation and utilization of resources, protection and management of resources.

资源科学是研究各种资源的特征、空间结构与分布规律、资源的开发利用、保护及管理的一门科学。

The mask applying to experiment is opened up and that the mask exposure's device is designed and done. The technologic flow of the MEMS unit's manufacture combining optical score, sacrifice layer, chymic deposit with the SL prototyping technology is researched and experimental sample is done. Taking 3D capacitance micro actuator done by RP technology as a example, the main point of the manufacturing technics is illuminated, the new way manufacturing complex micro mechanical structure is explored.

在介绍了微电子机械系统基本情况的基础上，首次提出了将RP技术应用于MEMS的思想以及平面掩膜式光固化快速成型方案；开发了实验用掩膜，设计并制作了平面曝光成型的实验装置该装置；首次研究了将光刻技术、牺牲层技术、化学淀积镀膜与光固化快速成型制造技术等相结合，来制作MEMS件的工艺流程，并制作了实验样件。

So this article introduces the development process of the system of coated paper .

因此本论文介绍了涂布系统的开发与研究。

The measurement method and principle of the temperature dependence of rotational viscosity coefficient of nematic liquid crystal were investigated on a personal computer-based optical system developed by us.

本文设计开发了基于微机的液晶参数测试光学系统，在该系统上研究了液晶的转动粘质系数的测试原理与方法：通过测试液晶盒在偏置电压下相位驰预时间，推导出转动粘质系数的值。

What we can do is to study the coorperative pattemsbetween these two countries, and seek for the superior complementation between the two countries.

我们所能做到的，就是认真研究两国经济合作的模式，寻求两国优势互补，在"双赢"的基础上，加快中西部经济的开发与利用。

The technologies related the system configurator are first introduced and studied. we review the advantages and disadvantages of the domestic and foreign same products.

本文首先介绍并研究了与系统配置器相关的技术，分析总结了同类产品的优缺点，然后介绍了我们最新开发的可视化系统配置器 VisualSCD。

Contemporaneously, we are seeking to develop new methodologies for accurate mass detection, as well as for disease diagnosis and in vivo, real-time study of therapeutic response base on mass spectrometry.

此外，本实验室也进行新生物质谱技术研发，未来也将致力於开发质谱仪与其他研究设备的连结介面，期能帮助鉴定疾病并监测治疗反应。

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。