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Aimed at rapidity and low power consumption required by intelligent mines,based on correlation theory and pattern recognition technology,a new method is given,in which helicopter noise signal of time domain is analyzed directly,that is to estimate fundamental frequency by calculating self-correlation function,then recognize target thinking of the fundamental frequency as characteristic quantity.

预警识别是被动声探测的关键技术之一，其作用是探测环境噪声信号作为预警信号，当直升机或其它目标出现时，传声器检测到的声能首先被转化为一定幅度的电压信号，电路通过判断信号的大小和其它特征来确定是否出现直升机目标。

If felt is used under the tile,its cost must also be include in the estimate of the job,and furring strips must be installed for certain applications.

如果毛毡使用在瓦片之下，它的费用在工作的估计必须也是包括，并且必须为某些应用安装furring的小条。

"Yes," he said gaily,"in less than two minutes I would estimate."

"是，"他快活地说，"我估计在两分钟以内。"

Photo Gallery: Tropical Rain Forest Wildlife Some studies estimate that ants make up an amazing 30 percent of the total biomass of Earth's tropical rain forests, far exceeding that of mammals.

意译：热带雨林野生动植物图片集。一些研究表明估计蚂蚁群体超过30％惊人的总生物量在地球的热带雨林，远远的超过哺乳动物。

This study aims to assess the most feasible feedstock to produce fuel ethanol and estimate the costs of (1) importing fuel ethanol directly;(2) importing feedstock to produce fuel ethanol;(3) planting energy crops to produce fuel ethanol in Taiwan. And then analyses the possible influence of gasohol strategies (such as E3, E5, and E10) by constructing a system dynamics model of Taiwan's motor gasoline demand.

本研究针对燃料酒精，透过相关文献搜集，评估台湾地区发展燃料酒精最适原料，概估国外进口燃料酒精、国外进口原料产制燃料酒精及台湾自产燃料酒精三方案之成本，并建构台湾地区车用汽油需求系统动态模型，模拟未来台湾地区车用汽油需求量，分析E3、E5及E10酒精汽油政策目标可能产生之影响。

Jianghan Mud Logging Engineering Company has set up a calculating model to estimate such parameters as porosity, saturation, permeability and mud content according to the data of gasometry and mud logging by assessment method of gasometry, interpretation on hydrocarbon show by comprehensive mud logging in the last 15 years.

近15年来，江汉测录井工程公司利用气测、综合录井油气显示解释评价方法，建立了气测录井资料估算地层孔隙度、饱和度、渗透率与泥质含量参数的计算模型，提出了利用综合录井资料评价油气显示的多参数加权分析与向量合成分析方法，开发了OGA-500综合录井油气解释软件，在生产应用中见到了良好的效果。

Simple correlation coefficientγcould be used to estimate the objective reliability among DTI data gauger.

DTI数据测量者间客观信度用简单相关系数γ评价。

The algorithm is featured with insensitivity to Gaussian noise. The proposed algorithm can estimate DOAs without search and match problem.

因此，在阵元数相同的条件下，与传统的循环域DOA估计算法相比，DOA估计的分辨率和可估计源的个数均得到大幅度的提高。

After three years working experience, we has achieved many design projects successfully includes, the second stage landscape engineering design of Huankou Garden developed by Wuhan Real Estate Investment Group, the planning design and architecture design of Zonglian International Residential District developed by Wuhan Zonglian investment Co., Ltd, Phoenix Town developed by Wuhan Huayi Real Estate Co., ltd, Chutian Thermal Spring Hotel developed by Liannin Jingjiang Tourism company, Enshi Genevese Amorous District, the landscape design for new office building of Wuhuan Tech joint-stock co., ltd, landscape design for headquarter of Zhongye Southern Engineering Technical Co., Ltd, office and technical research building of Zhongtie 11 bureau, landscape design for the Xiangshan Minyuan developed by Yichang Hongxiang group Co., Ltd, planning for the Tingtao Guanhai district developed by Wuhan Hongyu Industry Co., Ltd and etc. all of the projects above got the good estimate form our clients.

公司成立三年以来，出色地完成了多项设计工作，其中包括武汉地产开发投资集团的汉口花园二期景观工程设计、武汉众联投资有限公司的众联国际小区的规划、建筑设计、武汉市华盈房地产有限公司的凤凰城、咸宁锦江旅业公司的楚天温泉假日大酒店、恩施日内瓦风情小区、五环科技股份有限公司新办公大楼景观设计、中冶南方工程技术有限公司总部景观设计、中铁十一局集团有限公司办公科研楼、宜昌弘洋集团公司的香山铭苑景观设计、武汉宏宇实业有限公司的听涛观海的规划、建筑与景观设计等项目，深受各开发商和业主的好评。

Here, we will give an independent proof of the existence for inequality (2.1.3), and by the way, give an estimate on the width of the bi-enclosing annulus of closed convex curves in the plane. Secondly, in this part, we will introduce the notation of average geodesic curvature for curves in the hyperbolic plane, and investigate the relationship between the embeddedness of the curve and its average geodesic curvature.

其次，对双曲平面上的曲线引入平均测地曲率的概念，并讨论双曲平面上凸曲线的嵌入性与它的平均测地曲率之间的关系，其目的是为了将双曲平(来源：ABC论84文网www.abclunwen.com)面上曲线的性质与欧氏平面中曲线的性质作一些对比；最后，我们利用Minkowski支撑函数构造了一类新的非圆的光滑常宽曲线，其目的是想回答有关常宽曲线的一些未解决问题如是否存在非圆的多项式常宽曲线？

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。