20100920 some words

本文解析了英语中几个特定词汇的意思,并通过例句帮助理解这些词汇的具体用法。涉及的词汇包括para、sol、parasol等,同时还提供了一些短语和句子的例子。

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单词复习:earbud,emanate,emanate from,accommodate,partisan.

考你几个单词:para,sol,parasol,parity分别是什么意思,

para:
para
Noun
1. (obstetrics) the number of live-born children a woman has delivered; "the parity of the mother must be considered"; "a bipara is a woman who has given birth to two children"
(synonym) parity
(hypernym) pregnancy , gestation , maternity
(classification) obstetrics , OB , tocology , midwifery
2. 100 para equal 1 dinar
(hypernym) Yugoslavian monetary unit
(part-holonym) Yugoslavian dinar , dinar
3. a soldier in the paratroops
(synonym) paratrooper
(hypernym) soldier
(member-holonym) paratroops


翻译下:the number of live-born children a woman has delivered是何意思?

sol:
soles
Noun
1. a colloid that has a continuous liquid phase in which a solid is suspended in a liquid
(synonym) colloidal solution , colloidal suspension
(hypernym) colloid
2. the syllable naming the fifth (dominant) note of any musical scale in solmization
(synonym) soh , so
(hypernym) solfa syllable


parasol:太阳伞
parasols
Noun
1. a handheld collapsible source of shade
(synonym) sunshade
(hypernym) shade


~~~~~~~~~~~~~~
phrase:
tattered and torn
sentence:
won't hurt a bit.
~~~~~~~~~~~~
depict,anatomy,Fill in the empty bits to create inner peace,stale,jelly,dough,doughnut,grease,greasy,snack,glazed,table up close,come up some likely columns for each table,patron,deposit,withdrawal

~~~~~~~~~~~
words:
patron,apostrophe,leave out,

sentences:
1.Let's see all this in action with the doughnut data.

2.Say you were having trouble remembering what type of doughnuts a snack in your list was just from its name,you might create a table to save having to remember them instead.
~~~~~~~~~~~~~
words:
patron,apostrophe,leave out,jot, jot down, muck , muck up, gob,fraternal,

sentences:
1.Let's see all this in action with the doughnut data.

2.Say you were having trouble remembering what type of doughnuts a snack in your list was just from its name,you might create a table to save having to remember them instead.

3.last_name varchar(3) is very different column [than](from is OK?) lastname varchar(30)!
~~~~~~~~~~~~~~~~~~~~
分数阶傅里叶变换(Fractional Fourier Transform, FRFT)是对传统傅里叶变换的拓展,它通过非整数阶的变换方式,能够更有效地处理非线性信号以及涉及时频局部化的问题。在信号处理领域,FRFT尤其适用于分析非平稳信号,例如在雷达、声纳和通信系统中,对线性调频(Linear Frequency Modulation, LFM)信号的分析具有显著优势。LFM信号是一种频率随时间线性变化的信号,因其具有宽频带和良好的时频分辨率,被广泛应用于雷达和通信系统。FRFT能够更精准地捕捉LFM信号的时间和频率信息,相比普通傅里叶变换,其性能更为出色。 MATLAB是一种强大的数值计算和科学计算工具,拥有丰富的函数库和用户友好的界面。在MATLAB中实现FRFT,通常需要编写自定义函数或利用信号处理工具箱中的相关函数。例如,一个名为“frft”的文件可能是用于执行分数阶傅里叶变换的MATLAB脚本或函数,并展示其在信号处理中的应用。FRFT的正确性验证通常通过对比变换前后信号的特性来完成,比如评估信号的重构质量、信噪比等。具体而言,可以通过计算原始信号与经过FRFT处理后的信号之间的相似度,或者对比LFM信号的关键参数(如初始频率、扫频率和持续时间)是否在变换后得到准确恢复。 在MATLAB代码实现中,通常包含以下步骤:首先,生成LFM信号模型,设定其初始频率、扫频率、持续时间和采样率等参数;其次,利用自定义的frft函数对LFM信号进行分数阶傅里叶变换;接着,使用MATLAB的可视化工具(如plot或imagesc)展示原始信号的时域和频域表示,以及FRFT后的结果,以便直观对比;最后,通过计算均方误差、峰值信噪比等指标来评估FRFT的性能。深入理解FRFT的数学原理并结合MATLAB编程技巧,可以实现对LFM信号的有效分析和处理。这个代码示例不仅展示了理论知识在
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