查询词典 modulation capability

A software and a relevant method are designed and set up for the calculation of the relative content of the inactive PS Ⅱ center, by using which this study can be accomplished A new non-modulation fluorometer with its data acquisition and date analysis software is also designed and assembled

此外，也参加了新的非调制式动力学荧光计的研制及其软件的编写。

A new type of the non-modulation fluorometer has been built which has higher signal/noise ratio. responsibility and accuracy, much lower power consumption, and faster data acquisition rate, etc. This new software witten in C language can run in the IBM PC compatible computer.

新研制的荧光计的软件用C语言编写，可在IBM PC兼容机上运行，采样速度最快可达25μs/点，对Fo和Fi等参数的测定更加可靠和精确。

With mature wild M. officinalis plants as the materials, the diurnal variations of their chlorophyll fluorescence parameters and the photoresponse curve of chlorophyll fluorescence were determined by portable modulation chlorophyll fluorometer.

方法］以成熟的野生海枫藤植株为材料，利用便携式调制叶绿素荧光仪测定其叶绿素荧光参数的日变化和叶绿素荧光光响应曲线。

First, the paper reviews the development and research of AC transfer speed system, introduces the different control strategy of transfer speed system for asynchronous motor, and discusses the basic principle of vector control system for asynchronous motor in detail,including the mathematics model and coordinate transformation of asynchronous motor, the fundamental equation of vector control, the estimation method of rotor flux, the system structure of vector control etc. Then, the paper lays stress on the fundamental principle, control algorithm and realization method in TMS320LF2407 of space vector pulse width modulation technology.

本文首先简述了交流调速系统的发展和研究重点，介绍了异步电机调速系统的不同控制策略，详细论述了异步电机矢量控制系统的基本原理：异步电机的数学模型和坐标变换、矢量控制的基本方程式、转子磁链的观测方法、矢量控制的系统结构等，并重点分析了空间矢量脉宽调制技术的基本原理、控制算法以及在TMS320LF2407中的实现方法。

That is the speed identification and the rotor flux estimation scheme of the sensorless vector control, and realization ways of the carrier pulse width modulation, and the dead time compensation scheme.

即无速度传感器矢量控制的速度辨识和磁通观测、载波型PWM方法实现、死区时间补偿方案。

Based on CMOS technology and using Composer and Spectre tools of Cadence EDA, a type of single-chip controller is designed for the fly-back switching power supply of AC/DC. It works at 70KHz with current mode pulse width modulation; and the max duty is 75 percent.

本论文基于高压CMOS工艺，用Cadence EDA中的Composer包及Spectre仿真工具，设计了一种反激式AC/DC开关电源控制芯片。

In the voltage doubling rectifying circuit, the high voltage has been realized by the positive and negative way, and the voltage between the cathode and anode could reach 1700 V. In the fly-back switching high-voltage power supply, considering the requirements of each unit of the driving circuits on the power supply, the three-group voltage outputs including low-voltage outputs have been realized: 1600V/20mA,12V/500mA, 5V/50mA, in which UC3842 has been used to achieve pulse width modulation.

在倍压整流电路设计中，采用正、负电压方式实现高压，有效降低了阴阳极间所需的高压，最终两极间可产生1700V电压；在反激式开关电源电路设计中，利用UC3842芯片实现PWM调制，考虑到驱动电路各单元对电源的需求，设计了包括低压电源在内的三组电源输出：1600V/20mA，12V/500mA，5V/50mA。

A low in-band phase noise FM frequency synthesizer has been depicted in this paper. It bases on the fraction N PLL frequency synthesizer, and the THD of the system has been improved greatly by this closed loop modulation mode.

研制一种低带内相位噪声的立体声FM频率合成器，该合成器基于小数分频锁相环技术，利用闭环方式对载波信号进行调制，显著提高系统的THD。

Here a tracing of differential optic phase is presented and sin modulation is adopted in the method, triangular operator is applied and finally the rotation signal is gotten after multipling on FOG output and the tracing signal, and adding filters to where they are needed.

提出了一种单通道光相位差跟踪的方法。这种方法采用正弦调制，通过对信号(包括输出信号和跟踪信号)的三角和乘法运算，并在必要的环节进行滤波得到光相位差。

In young human umbilical vein endothelial cells, human aortic endothelial cells, and human coronary artery endothelial cells, miR-217 induces a premature senescence-like phenotype and leads to an impairment in angiogenesis via inhibition of SirT1 and modulation of FoxO1 (forkhead box O1) and endothelial nitric oxide synthase acetylation.

在婴儿脐静脉内皮细胞、人类主动脉内皮细胞以及冠状动脉内皮细胞中，miR-217可以诱导这些细胞出现一种早衰样表型，进而通过抑制SirT1的表达、调控Fox01以及内皮细胞一氧化氮合酶的乙酰化来损伤新生血管的形成。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。