Design of Bandpass Filter for Center Frequency Stageless Selecting

Design and Realization on the Low Frequency Band Pass Filter with Center Frequency Adjustment

中心频率可调节的低频带通滤波器设计与实现

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It is proved by the analysis of the simulated signals and different signal to noise ratio experimental data that this method can effectively determine the filter center frequency and bandwidth, thereby improving the signal to noise ratio and the diagnosis of bearing faults.

通过对仿真信号和不同信噪比实验数据的分析，证明此方法能够有效确定滤波中心频率和带宽，从而提高信号的信噪比，实现对轴承故障的诊断。

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The design process is simple and can be simulated by the sophisticated SAW unit electrode and interdigital parameters. The parameters adjustment is very simple when filter center frequency and bandwidth changes.

设计过程简洁，可采用成熟的SAW单元电极和叉指参数进行计算机模拟，且当所设计的滤波器通带频率和带宽变化时，参数调整方便。

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Beauty is in the eyes of the beholder. But, no exaggeration even to a foe, you'd be beautyful.

有的人情人眼里才是西施，不过分的说，仇人眼里都是西施。

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Beauty is in the eyes of the beholder. ( Aesop)

美存在于欣赏者的眼中。

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While either of these explanations may be valid depending on who you ask, do you really need a reason beyond the obvious danger associated with hanging around under a ladder?

以上两种解释到底哪一个可能是合理的，这取决于你问的是谁，取决于你是否还需要另一个理由——除了“在梯子底下闲逛明显是有危险的”之外，来确保人们远离梯子。

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For ships and vessels: hanging ladder screen, railing screen, cabin partition screen, flame-retarded screen etc.

详细信息：船舶类：舷梯网、护栏网、救生网、隔仓网、阻燃安全网等系列；

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Prosperity makes friends, adversity tries them.

顺境结交朋友，逆境考验朋友。

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He is much experienced in teaching. Prosperity makes friends and adversity tries them.

他有丰富的教学经验。富裕招致朋友，困苦考验朋友。

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"Prosperity makes friends, and adversity tries them"

顺境交的朋友，逆境接受考验

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Patients were received fluorescent diagnosis induced by small dose of hematoporphyrin ( 2 mg/ kg). 35 of them were cancered.

以2mg/kg剂量的血卟啉衍生物（HpD）对43例患者进行荧光诊断，其中35例为肿瘤患者，8例为非肿瘤患者。

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The purification of AFP from the cancered ascites by means of affinity chromatography and the preparation of corresponding monoclonal antibody

从癌性腹水中亲和层析提纯AFP并制备相应的单克隆抗体

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An Analysis of Chromosome Aberrance of the Gastric Cancered

胃癌患者的染色体畸变分析

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The doctor made cancered diagnose to someone, as good as gave notice of a piece of death at leaving.

医生给某人作出了患癌症的诊断，无异于开出了一张死亡通知书。

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Two months later I fell ill with chronic fatigue syndrome, and was simply too ill to work.

两个月后，我患上了慢性疲乏综合症，由于病得太厉害，我根本没法再工作了。

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That remark of his sorted ill with his character.

他的那句话和他的性格是不协调的。

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The clinical analyses of the detecting of the plasma endotoxin of 78 cases ill with viral hepatitis

78例病毒性肝炎血浆内毒素检测的临床分析

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I can smell trouble. I have been ill with influenza.

我凭直觉感到有麻烦了.我一直患流行性感冒。

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He had been seriously ill with rheumatic fever and could no longer travel easily.

他患有严重的风湿热，不能再轻易出门。

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The surgical treatment of 46 cases ill with functional obstruction at ureteropelvic junction

46例功能性肾盂输尿管交界处梗阻的外科治疗

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