转速

The rotative speed measurement methods of high - speed wide - range flat sewing machine brushless DC motor are discussed.

摘 要：论文针对宽调速范围高速工业平缝机无刷直流电机的转速测量方法进行研究。

The results show that the transmission characteristics are affected by exoteric irregularities,specially at sensitive wavelength,but its frequency is mainly determined by rated rotative velocity of the shaft.

结果表明，万向轴传动特性受外界干扰的影响，在敏感波长不平顺作用下最为显著，但其频率特征则主要由万向轴名义转速决定。

The Daubechies second order wavelet was firstly used to decompose pressure signals at different rotative speeds to 1—9 scale detail signals and scale approximation signals.

对浸没循环撞击流反应器不同转速下的压力波动信号用 Daubechies 二阶小波在 1～9 尺度下进行分解，并分别对分解的信号进行 R/S 分析。

This paper introduces a non-contact instrument for the rotative speed of motor engine through detecting the pulse which generated by motor ignition.It possesses the characteristic of simple structure,convenient use and pre-cise measure.

介绍了一种通过检测汽油发动机高压线产生的脉冲信号来实现非接触测量发动机转速的方法，系统结构简单、使用方便、测量准确，可广泛用于发动机的检修、教学及科研中。

The result shows that the temperature for copolymerization, the dosages of initiator and cross-linker are major factors while the amount of dispersing agent and rotative velocity of agitator are minor factors affecting the absorbility.

结果表明聚合温度、引发剂浓度和交联剂用量是决定吸水率和吸盐水率的主要因素，而分散剂用量、搅拌转速对反应结果影响不明显。

Vtp pulley can be widely used in compressors, agriculture machines and other industrial machines which require high speed transmission.our company has strong technology and advanced equipments such as automatic moulding system(disa230b), sinto ace5, advanced automatic pouring equipment, eirich automatic sand mixer, kinds of meaurement equipments(arl spectrometer, cmm, magnetic particle inspection machine and so on), machining center(200sets), cnc lathe(400sets), drilling machine(200sets) and machines for surface treatment.

它主要应用于压缩机、农机、以及工业机械上需要高转速的传动设备，每秒线速度可达100米以上。本公司具备雄厚的技术力量跟先进的生产设备。铸造： disa造型系统(disa230b)、新东ace5 、先进的自动浇注设备，eirich 自动混砂机及各种检测设备(arl 分光仪、cmm 、磁粉探伤仪等)，加工：加工中心(200台)、cnc车床(400台)、钻床(200)；及表面处理。

A mechanical stepless speed regulator is adopted to make the curbing work. The speed can be regulated when the curbing work and can be slewed steadily.

本机配机械无级调速电机、驱动转盘旋转，转盘的转速可在工作时间任意调速，调速平稳。

An SLon pilot continuous centrifugal concentrator (SLon pilot centrifugal concentrator) was used to study the effects of drum rotation speed and reciprocating velocity of water sprays on the separation performance of the concentrator under the optimum conditions of feed volume flow rate (24.5±0.4) L/min, feed solids content 20% and impacting pressure of water sprays 0.45 MPa, with the high gradient magnetic separation concentrate assaying 52.42% Fe from fine hematite tailings as test material.

摘 要：采用SLon实验型连续式离心机(简称SLon实验型离心机)，以高梯度磁选细粒赤铁矿尾矿得到的磁性产物(52.42% Fe)为试样，在给料体积速率为(24.5±0.4) L/min、给料固体浓度为20%和水束流冲击压力为0.45 MPa的条件下，研究转鼓转速和水束流往复速度对连续离心分离指标的影响。

Results: In 2007, we provided 602 SPET/CT services in myocardial perfusion scan for attenuation correction and 202 SPET/CT services in other scans for image fusion. Among 64 regional bone SPET/CT services, we noted 2 (3.13%) significant motion artifacts and 2 (3.13%) streak artifacts induced by beam hardening effect while among 25 Ga-67 local SPET/CT services. According to the features including low tube currents and slow rotating speed of this SPET/CT, some problems such as the patient safety, longer scan time, alignment mismatch and radiation protection would be analyzed and discussed.

结果：2007年804例SPET/CT造影中，602例心肌血流灌注断层摄影进行衰减校正，共202例病例进行影像融合，其中鎝－99m-MDP局部SPET/CT发生「影像上明显可见的移动假影」的比例为3.13%(2/64)，镓－67局部SPET/CT发生移动假影的比钊则为24%(6/25)，因射束硬化效应所造成的条状假影有产生干扰融合影像判读的情形，其他问题包括SPET/CT之CT低管球电压及低转速之机器特性、受检者的安全、较长的造影时间、对位错误及辐射防护筝。

The content of the research is about the application of the rule of step ratio exponents to stepless shifting system.

通过对机械无级变速系统中级比规律应用进行探讨，来进一步分析级比规律对变速系统中转速、功率分布规律的影响，为更合理的设计无级变速系统提供有益的理论探索。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐