thereby, combining with data mining and statistical process control approach, this thesis mainly discovers the abnormal on time series, then puts forward a process framework of analyzing abnormal patterns.

using observed precursor data of underground water in shaanxi-gansu-ningxia and qinghai and abnormal series method, this paper studied the intermediate precursor indexes of moderate-strong earthquake in the four provinces and regions, further inquired into the seismic situation in the weihe basin and vicinity.

本文用陕、甘、宁、青的地下水前兆观测资料，运用异常系列方法的思路，研究了四省区中强地震的中期前兆指标，并进一步探讨了渭河盆地及周边的地震形势。

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the incidence of pure aortic incompetence was 2.5%. pure mitral incompetence 1.5%, pure mitral stenosis 0. 1%. pure tricuspid incompetence 0.1%, mitral valve prolapse 0.2%, multivalvular heart disease 1.0%.

各瓣膜病发病率：单纯主动脉瓣关闭不全2.5%，单纯二尖瓣关闭不全1.5%，单纯二尖瓣狭窄0.1%，单纯三尖瓣关闭不全0.1%，二尖瓣脱垂0.2%，多瓣膜病1.0%。

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short-term follow-up analyses of isolated mitral valve replacement for mitral valve disease with mild aortic incompetence

合并轻度主动脉瓣关闭不全的二尖瓣病变行单纯二尖瓣置换近期随访分析

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methods: from july to september of 1999,8 patients diagnosed as marfan's syndrome with aortic root aneurysm and aortic incompetence underwent aortic root replacement using composite valve grafts.

方法：1999年7月至9月，对8例马凡综合征主动脉根部瘤合并主动脉瓣关闭不全患者以复合带瓣人工血管行主动脉根部置换术。

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reconstruction surgery of aortic incompetence: a clinical study

主动脉瓣关闭不全成形术的临床研究

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hydro-viscous drive ( hvd) clutch has been widely applied in the mine and port material handling in recent years since it has some characteristics of running velocity controllability and soft start-up under the heavy load and low running speed conditions.

液体粘性调速离合器，由于在重载、低速工况下具有良好的速度可控性以及软启动等特点，近年来在工矿、港口物料输送等行业获得广泛的应用。

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to overcome the existing problems specific to a hydro-viscous speed regulator, the authors have developed a direct-controlled hydro-viscous variable speed driver ( hvd), which features an organic integration of control precision, dynamic response and operation reliability.

针对液粘调速器存在的问题，研制出一种将控制精度、动态响应与工作可靠性有机结合的直控式液粘调速器。

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owing to performance superiorities, such as stepless speed regulation and highly effective energy-saving etc., the hydro-viscous drive ( hvd) set has been widely applied in many industrial areas like thermal power plants, etc.

油膜调速离合器（HVD）因其无级调速和高效节能等性能优势已广泛应用于热力发电等众多工业领域。

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the proposed hvd method was based on the hilbert transform ( ht), just as hilbert-huang transform ( hht), but did not involve complicated empirical mode decomposition ( emd).

虽然HVD方法和希尔伯特黄变换（HHT）方法这两者均以希尔伯特变换为基础，但HVD方法避免了复杂的经验模式分解（EMD）过程。

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this paper is based on the study and development of hvd at home and abroad, and fully introduces and analyses the principle, structure and control speed performance of the hydro viscous variable speed drive in theory.

本文在综述国内外对液体粘性传动技术的研究和发展状况的基础上，以液体粘性调速离合器为研究对象，对其工作原理、结构和调速特性进行了全面介绍和详细理论分析。

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at the end of the thesis, a brief introduction of the electrical control system of hvd and a method of using pid control to carry out speed of rotation of closed loop control are brought forward.

对于HVD的电气控制系统进行了简要介绍，提出了运用PID控制进行转速闭环控制的方法。

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hydro-viscous drive set ( hvd) has been widely applied in many industries for its advantages of efficiently energy-saving, stepless speed regulation, and so on.

滑差离合器因其无级调速和高效节能等性能优势已开始应用于各工业领域。

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the analysis is given in detail to several typical speed control systems for hvd as well as their advantages and disadvantages, the new method is put forward in the end.

详细分析了现有的几种典型的液粘调速离合器转速控制系统及其各自的优缺点，并提出一种完善液粘调速器转速控制系统性能的新方法。

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new type of hydro-viscous variable speed driver ( hvd) and its application in power plant the analysis of several typical speed control systems for hvd

新型液粘调速器及其在电厂中的应用几种典型的液粘调速器转速控制系统的分析

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hydro-viscous drive ( hvd) that has developed since middle 1970s from abroad is a new fluid transmission.

液体粘性传动（Hydro-Viscous Drive，简称HVD）是20世纪70年代中期从国外发展起来的一种新型的流体传动形式。

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the optimization of the friction disc in hvd

HVD中摩擦副的优化设计

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the system composition and working principle of hydro-viscous driver ( hvd) control system are presented briefly in this paper.

本文简要介绍了液体粘性调速离合器控制系统组成及其工作原理。

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research on application of hvd in pumps load

液粘调速装置在泵类负载上的应用研究

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this provides the theoretical foundation for applying hvd in real life engineering situations.

这为HVD装置在工程实际中的开环应用提供了理论依据。

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study on the stability of hvd clutch used in constant pressure water supply system

液体粘性调速离合器在恒压供水系统中的稳定性研究

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