secondly, on the basis of the scope of agricultural machinery's traveling speed, incremental rotary encoder ( 360rpm) is used as speed sensor in order to approach to transient speed.

magnetic encoder investigation with zero pulse signal

零脉冲高分辨率磁编码器的研制

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collect the mechanical rotary information by encoder, use high-precision clock pulses of 50m to calculate the pulse width of the encoder, and analyse the data with fft spectrum and cepstrum analysis.

采用编码器采集机械的旋转信息，利用频率为50M的高精度计数脉冲来计算编码器脉冲的宽度，并对所采集的数据做FFT频谱和倒频谱分析。

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in the digital servo system applying increment photoelectricity pulse coder as feedback element, precise measurement of initial position of motor rotor is an important problem, its principle and realizing method are presented in this paper, the measurement results are also given.

以增量式光电脉冲编码器作为反馈元件的数字式交流伺服系统中，精确地测量电机转子的初始位置是一个重要的技术难题。详细介绍了其基本原理和实现的方法。

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for the sake of simplicity and low cost, in some closed-loop position and velocity control system design, we use the hall sen-sor to produce position and velocity feedback signal, thus do not need the optoelectronic pulse encoder.

在闭环的位置和速度控制系统的设计中，为了使系统简单可靠和成本低，倾向于只用电机自身的霍尔传感器的信号进行位置和速度反馈，不需要另外安装别的检测元件如光电脉冲编码器等。

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the working principle of pulse encoder is analyzed, and its two application modes are discussed for the automatic non-destructive testing ( ndt) of metallurgical tubes and bars.

分析了脉冲编码器的工作原理，并讨论了它在金属管棒材自动无损检测中的两种应用方式。

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an interfacing circuit which makes the incremental pulse encoder working with microcomputer for absolute position measurement is introduced.

介绍一种接口电路，使增量式脉冲编码器与微机联合使用，实现绝对位置的测量。

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the close loop system of frequency conversion adjusting speed is based on non-speed feedback equipment or pulse coder.

变频器转速闭环变频调速系统设计采用无速度反馈装置或脉冲编码器。

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the counter based on embed-controller for incremental opto-electric encoder

增量式光电脉冲编码器的单片机计数器

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evaluating the mechanical-electrical data of electro-optical shaft encoders by fuzzy mathematics method

用模糊数学法评价光电脉冲编码器的综合指标

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have designed the interface of ultrasonic transducers of measuring distance and pulse encoders of sampling velocity which use the dsp as the processor;

设计以DSP芯片为核心的超声波测距传感器和光电脉冲编码器的接口电路；

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a localization device combined with pulse encoder and gps

一种脉冲编码器结合GPS的精确动态定位装置

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the implementation of quadruplicated frequency circuit in photoelectric pulse encoder and the application

光电脉冲编码器四倍频电路的实现及其应用

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the application of incremental pulse encoder in absolute position measurement

增量式脉冲编码器在绝对位置测量中的应用

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the pleural indentation with pleural thickening.

伴有胸膜增厚的胸膜凹陷征。

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conclusion bi-tilted angle ct scanning, compared with transverse section ct scanning, offers advantages on revealing more image features of pulmonary nodes, especially of pleural indentation and air-bronchus.

结论双倾斜角度CT扫描与常规横轴位CT扫描比较，影像学特征表现显示更明显，特别是胸膜凹陷、空气支气管征的显示更优。

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pleural indentation and lung cavity both have great clinical diagnostic value. pleural indentation is one of the common signs of early lung cancer, and malignant lung cavity often has thick walls, be eccentric and so on.

胸膜凹陷征和空洞征在临床上都极具诊断价值，胸膜凹陷征是早期肺癌的常见征象之一，癌性空洞往往表现为洞壁较厚、呈偏心性等特点。

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results typical nodules with deep lobulated sign, spiculated sign, vacuole sign, air bronchogram, pleural indentation, and vessel convergence has great value in the diagnosis of malignant spn.

结果典型结节并具有深分叶征，毛刺征，小泡征，含气支气管征，胸膜凹陷征，血管集束征对恶性结节的诊断具有较高价值。

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results: most of the pulmonary cavities of cancer have thick wall and wall nodule with pleural indentation whereas the cavities in tuberculosis have thin wall with satellitic lesions.

结果：癌性空洞一般为厚壁，有壁结节，分叶及周围胸膜凹陷征多见，而结核空洞薄壁相对多见，常有卫星灶。

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though they showed no relation to spiculation sign, vacuole sign, pleural indentation sign and bronchus sign ( p> 0.05).

二者表达水平与毛刺征、空泡征、胸膜凹陷征和支气管征均无关（P>0.05）。

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results: the size, necrosis, cavitation and lymph node metastasis of peripheral lung cancer are correlated with the abnormal expression of fas, but the pleural retraction sign, small vacuole sign and vascular-bronchial convergent sign have no obvious relationship with the expression of protein fas.

结果：周围型肺癌的大小、坏死、空洞及纵隔淋巴结转移与Fas异常表达关系密切，而胸膜凹陷征、小泡征、支气管血管集束征与Fas表达关系不密切。

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