查询词典 narrower

Also it can he concluded that the narrower the width of the channel is, the higher the flood level rises.

对于在河流中如何布置和种植人上湿地及湿地植物的选取具有一定的指导作用。

Length of Fourier transform is connected with curve resolution. Curve resolution is lower, window length of Fourier transform is narrower.

为截取最强地层响应信号，选取Fourier变换窗函数，窗长与曲线原始分辨率有关，分辨率越低的曲线窗长越大。

There was, however, shorter root formation and a narrower root cavity compared with the contralateral incisor.

然而，也有人短，根系的形成和狭义根腔较对侧门齿。

The main job and contribution of this paper are as follows:Based on narrowband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, compute the cross-correlation function of FH signals from multichannels, then we get the cross power spectral density matrixCSDM Secondly, select the hops of FH signals from the CSDM via processing and analyzing the CSDM, meanwhile reduce the influence coming from noise, fixed frequency signal and other interferences; Lastly, estimating the DOA of every hop and according to the DOA, we can separate the hops, get the number of FH signals and their parameters. Propose a new method for designing the threshold in FH signal detection. This method makes it easy to get the threshold by theoretic computing and it can extremely reduce the interference of non-FH signals.Based on broadband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, get the DOA of the signals by wideband spatial spectrum estimation; secondly, separate the signals by spatial filtering using wideband beamformer; Lastly, we propose two methods for FH signal blind detection and blind parameter estimation, one is for several constant hop-rate FH signals whose dwell-time are different and another is for a single FH signal whose hop-rate is alterable.By employing spatial interpolation in broadband signal beamforming, it can reduce the number of antenna elements and corresponding RF modules, A/D converters, etc. It can also eliminate the mutual coupling between antenna elements while getting the narrower main beamwidth and lower sidelobe level.

本文的主要研究工作和贡献如下：●提出了一种基于窄带处理的FH信号盲检测和参数盲估计的实现方法，即首先求出多路信号之间的互相关，进而得到互功率谱密度矩阵，然后通过对CSDM进行对折处理来抑制噪声、定频信号及其他干扰的影响，并将所有属于FH信号的hop(每一跳的驻留时间在时频图上持续的线段)从CSDM中筛选出来，最后用阵列信号处理中的到达方向估计理论在频域中估计出各个hop的方向参数，利用方位信息完成FH信号分离并得到FH信号的数目及其各自的参数集；●提出了一种确定FH信号检测门限的策略，该策略不仅使得检测门限能够通过理论计算得到，而且还显著地抑制了非跳频信号的干扰，从而能有效地检测出FH信号；●提出了一种基于宽带处理的短波FH信号盲检测和参数盲估计的实现方法，即首先利用宽带空间谱测向技术得到接收信号的DOA，然后采用宽带波束形成技术对特定方向进行空间滤波，实现多个信号的分离，最后分别提出了两种FH信号的盲检测和参数盲估计方法，第一种方法适用于空间某个特定方向上存在着几个驻留时间不同的恒跳速FH信号和其他干扰信号的混合信号，第二种方法适用于空间某个特定方向上仅含一个可变跳速的FH信号和噪声的混合信号；●将空间插值的概念和宽带波束形成技术结合起来，提出了一种基于频域处理的宽带恒定束宽的波束形成方法。

Corolla tube usually exserted from calyx, slender, wider at throat; central lobe erect, usually cucullate; lateral lobes spreading, narrower than central one, usually free.

通常的花冠筒从花萼外露，纤细，宽在喉部；中央裂片直立，通常兜状；侧面裂片传播，比中间一枚，通常离生狭窄。

In fact, with 53 degs. the EDF does not show much. Even narrower is the view through the PZO: The 50 degs.

实际上，只有53度视角的EDF不可能显示太多，通过PZO看的视野更狭窄：大约50度。

Fruiting pedicels stout, slightly narrower than fruit base, 2-3(-5) mm, divaricate.

果梗粗壮，稍狭窄比果基部，(-5)毫米，极叉开。

The second collector layer is made of a doped or undoped semiconductor having a narrower band gap than the first collector layer in such a way as to contact the base region.

第二集电极层是由掺杂或未掺杂的半导体制成的，具有比第一集电极层窄的带隙，与基极区域接触。

If you make the w in dow narrower, you can't even see the values.

如果你使窗口更窄，那么你甚至不可以看到这些值。

Covers ranges, e.g., a global range, or a narrower one; may be biogeographical,political or other (e.g., managed areas like conservencies); endemism; native or exotic; ref Darwin Core Geospatial extension

描述物种按行政区域或生物地理区域界定的地理分布范围，可以是全球性分布，也可以是局部尺度上的分布情况。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。