若干个

The detected leakage signal can be decomposed into a sum of finite intrinsic mode functions by EMD, some of IMFs embracing typical AE characteristic can be selected to be reconstructed. Thus, noise interference can be eliminated. The reconstructed signals are analyzed and their cross-correlation parameter is calculated.

该信号分析方法将管道泄漏产生的声发射信号通过EMD分解为多个平稳的固有模态函数之和，选择包含声发射特征的若干IMF分量进行重构，可以提取到管道泄漏声发射信号的本质特征，消除噪声信号的干扰。

It's always a dangerous world for a few true people, and a fool's paradise to the most.

对于若干真实的人来说，这是个危险的世界。

Based on the previous in-depth analysis of the four dimensional factors regarding the competitiveness of venture firms, the author has chosen some success and failure cases of venture firms and venture investment companies to conduct further research.

在对风险企业竞争力四个关键维度要素进行深入分析的基础上，本章选择若干风险企业和风险投资公司成功、失败的案例进行分析。

In this thesis, we discuss several problems which exist to qualitative theory of the functional differential equation, within which we develop further two important theories, so-called the 3/2 - stability theory and the distribution of zeros of solutions of the functional differential equation.

本文中，我们对泛函微分方程定性研究中存在的若干理论问题进行探讨，对其中两个重要问题即3/2—稳定性理论和零点距估计问题，作了进一步推广。

By using the continuous observational data of air,radiation and soil from two sites of automatic weather station at Gaize and Shiquanhe on the western Qinghai-Tibet Plateau in the period from October 1997 to November 1998,the diurnal variations of surface albedo in summer and winter are analyzed.

根据1997年10月至1998年11月青藏高原西部改则和狮泉河两个自动气象站连续观测的大气、辐射和土壤资料，在分析高原西部地面反射率冬、夏季日变化特征的基础上，重点研究了地面反射率与土壤和大气若干重要因子(如土壤湿度、土壤温度、空气相对湿度、空气温度)的关系。

In this thesis, a series of the problems of stochastic simulation for geomagnetic field was investigated.

完整的随机模拟包含统计模型化，模拟抽样和模拟推断三个部分，本文比较系统地研究了地磁场随机模拟的若干问题。

There are stairs at the ,because the museum is on the second ,the style of the museum in Copenhagen is similar to that of the erotic museum in ,we can see a big gold-filled penis placed in front of the gold-filled folding screen in oriental

它坐落在市中心的步行街上，和许多商店夹杂在一起，门面不算大，进门是个楼梯，要沿楼梯走上去。它的风格似乎和阿姆斯特丹的性博物馆有些类似，没有什么大展厅，都是一些小房间，由若干走廊、楼梯相连，设计、布置还是颇具匠心的。

In this paper,we introduce the main research content and the basic principle of GAN,the situation and development of the gravity sensor ,digital map processing and matching theory in home and abroad,especially the architecture and the research results of Gradiometer As an External Navigation Aid,Gravity Aided Inertial Navigation System.

本文在进行了一般性辅助导航方法的概述之后，详细介绍了与辅助导航相关的重力场基本概念、重力辅助导航系统的主要研究内容、基本原理；从重力传感器、重力图数据处理及重力图匹配理论与算法三个方面详细介绍了其国内外研究现状，重点介绍了重力梯度仪辅助导航、重力辅助惯性导航和通用重力模块三种系统的体系结构和研究成果；总结了重力辅助导航涉及的关键技术及其发展趋势；最后给出了我国开展海洋重力辅助导航研究的若干建议

In this chapter, firstly, the definition of rough semigroups is given afresh. Then based on rough groups, rough subgroups, rough cosets, rough invariant subgroups, some properties of rough subgroups and rough invariant subgroups and the concept of rough quotient groups are introduced. Finally, based on some concepts of homomorphism and isomorphism of rough groups, basic homomorphism theorem and isomorphism theorem of rough groups are put forward and proved.

在这一章中，首先重新给出了粗糙半群的定义，其次在粗糙群、粗糙子群、粗糙陪集、粗糙不变子群的基础上，给出了粗糙子群的若干性质、粗糙不变子群的三个重要性质和粗糙商群的定义，最后在粗糙群同态与同构的基础上，给出了粗糙群同态基本定理与同构定理。

In this paper, the author queried a few conclusions in [1] , and elaborated different views on several problems, such as relations between non-Euclidean geometry and real space, relations between mathematical logic and thinking, the significance of Godel s second incompleteness theorem, and so on.

本文对文〔1〕的几个论断提出一些疑问，并在"非欧几何与现实空间"、"数理逻辑与思维"、"哥德尔不完备性定理的意义"等若干问题上表述了与《数学是什么》一文中不同的观点。

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。