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pulse
相关语句
  脉冲
    Study on the Mechanism and Process of Pulse Current Hot Joining of Alloys
    脉冲大电流热焊接合金的机理和工艺研究
短句来源
    STUDY ON THE FAVOURABLE METAL TRANSFER MODE IN PULSE MIG WELDING
    熔化极脉冲焊熔滴过渡合理形式的研究
短句来源
    CLOSE LOOP CONTROL OF WELD PENETRATION IN PULSE PLASMA ARC WELDING
    脉冲等离子弧焊接焊透质量的闭环控制
短句来源
    Large pulse power supply for EDM
    电火花加工大功率脉冲电源
短句来源
    SIMULTANEOUS DETERMINATION OF TRACE OF BISMUTH, LEAD, CADMIUM AND ZINC IN NICKEL AND NICKEL-BASE ALLOYS BY DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY
    微分脉冲阳极溶出伏安法同时测定镍和镍基合金中微量铋、铅、镉、锌
短句来源
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  “pulse”译为未确定词的双语例句
    Guided Short Circuit Transfer Type CO_2 Shielded Arc Welding with Negtive Pulse Current
    负脉冲电流诱导短路过渡CO_2气体保护焊
短句来源
    A STUDY OF THE TRANSISTOR POWER SOURCE USED FOR THE GUIDED SHORT CIRCUITING TRANSFER TYRE CO_2 SHIELDED ARC WELDING WITH NEGATIVE PULSE CURRENT
    负脉冲电流诱导过渡CO_2焊接用晶体管电源的研究
短句来源
    A New Technology for Tempering of the High Speed Steels in a Pulse Magnetic Field With Medium Strength
    高速钢电磁脉冲磁场回火新工艺
短句来源
    Analysis of Pulse Waveform for WEDM-HS and Its Machining Characteristic
    快走丝线切割脉冲波形分析与加工特征研究
短句来源
    HARDENING BEHAVIOUR OF STAINLESS STEEL 316 DURING FATIGUE WITH THERMAL PULSE
    316不锈钢热照射疲劳中的硬化行为
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  pulse
A sensitive complex absorptive wave of Ca-ARS was obtained by using differential pulse voltammetry when a mercury film glass carbon electrode was immersed in 0.1 mol L-1 KOH and 4.5×10-4 mol L-1 ARS solution.
      
The reaction mechanism between isoquinoline and ·OH radical in aqueous dilute solutions under different conditions was studied by pulse radiolysis.
      
The electrochemical behavior of ciprofloxacin (CFX) and its interaction with the natural calf thymus DNA (ctDNA) is studied by using pulse difference voltammetry on a carbon electrode.
      
Furthermore, it is clear that when carrier signal h(t)=0, closed-loop pulse-width modulation (PWM) DC-DC converters are not well posed, and when some condition is satisfied, the closed-loop PWM DC-DC converters with a P controller are well posed.
      
In this paper, the authors propose a new space vector pulse width modulation (SVPWM) algorithm based on non-orthogonal coordinates for N-level inverters.
      
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Two types of 300A low frequency pulse arc TIG welding machine have been developed. In this machine the pulse current is made purposely to have a peak at the leading edge, which enables successfully one side welding of small diameter tubes in position and meanwhile obtaining good reverse side weld forming. The method for improving the dynamic response of the saturable reactor is analysed and the problem of surge current at the arc initiation is solved. The electric circuits of both types of saturable...

Two types of 300A low frequency pulse arc TIG welding machine have been developed. In this machine the pulse current is made purposely to have a peak at the leading edge, which enables successfully one side welding of small diameter tubes in position and meanwhile obtaining good reverse side weld forming. The method for improving the dynamic response of the saturable reactor is analysed and the problem of surge current at the arc initiation is solved. The electric circuits of both types of saturable reactor prove that they meet the technological requirements of low frequency pulse arc TIG welding. The pulse current generator is simple and is made with ordinary electronic devices. A simple electronic circuit is adopted for compensating the power mains fluctuation. These machines have excellent characteristics and are simple in construction, reliable in operation, easy to be repaired and light in weight. The weldable thickness for one pass welding ranges from 1-5mm in case of square butt joints and may be larger if bevel groove is applied. The developed machines are now being used in practice for welding 2-3.5mm, thick tubes in position and also the first pass of the circumferential seams of the pressure vessel made with 17mm thick stainless steel plates.

研制了两种300 A带尖峰的低频脉冲钨极氩弧焊设备,成功地解决了小直径管子等许多产 品的单面焊双面成型的工艺问题。分析了改善磁放大器电磁惯性的方法,克服了引弧冲击问 题;所用磁放大器的两种线路,均能满足低频脉冲焊接的工艺要求;用普通元件作成了简单 的带尖峰脉冲发生器;采用了简便的电网波动补偿方案。焊机性能良好、简单可靠、易造好 修、重量较轻。能不开坡口焊透1-5mm钢板,厚板可开坡口对接。该设备已用于2—3.5mm。 厚的管道全位置焊接生产及17mm不锈钢压力容器的环缝封底焊等。

This paper has discovered that arc appearances in that pulse MIG welding process are controllable.The technological characteristics of fhe pulse arc can be regulated to some extent by controlling the arc appearance.The different visiblearc appearances are dependent on the changing process of the instantaneous arc appe-arances.This paper has examined fhe effect of pulse currnt waveform,pulse currentamplitude,shielded gas and other factors to this changing process,and offer thepossible...

This paper has discovered that arc appearances in that pulse MIG welding process are controllable.The technological characteristics of fhe pulse arc can be regulated to some extent by controlling the arc appearance.The different visiblearc appearances are dependent on the changing process of the instantaneous arc appe-arances.This paper has examined fhe effect of pulse currnt waveform,pulse currentamplitude,shielded gas and other factors to this changing process,and offer thepossible ways for controlling the arc appearance.Different arc appearancedetermines the different metal transfer mode.Through the comparative studyof metal transfer modes in both,flat and overhead welding positions by high-speedphotography authors of this paper suggests that both single-droplet and multidroplettransfers per pulse are axial and powerful in flat and overhead welding,but themultidroplet transfer mode per pulse can have broader region of welding condit-ions than singledroplet mode.Arc jumping phenomenon is a common physical essence of the strearming transfer mode.The essential chang of the liquid wire tip and the appearing of the streaming transfer feature take place only after the arc jumping phenomenon.In process of streaming transfer of continuous current arc jumping phenomenonappears only once at start stage of arc,while in process of pulse streaming tra-nsfer arc jumping phenomenon repeats in every pulse current period.In both single-droplet and multidroplet transfers per pulse droplet can deta-ch and transfer after the end of pulse current period (i.e.during base currentperiod).This may attribute to inertia action of transfer mass and to instabilityof liquid metal column on the wire tip,which separates into several pieces andthen form small droplets transfering to weld pool.

本文通过试验发现熔化极脉冲焊具有电弧形态可控的特点,通过两种典型目视电弧形态的控制可以在一定程度上控制脉冲电弧的工艺特性。不同的目视电弧形态是不同的瞬时电弧形态的变化过程决定的,本文研究了脉冲电流波形、脉冲电流值和保护气氛等因素对瞬时电弧形态变化过程的影响,为控制电弧形态提供了可能的途径。熔滴过渡与电弧形态有密切的关系。不同的电弧形态决定了不同的熔滴过渡形式(?)本文用高速摄影技术通过平焊和仰焊试验对不同熔滴过渡形式进行了比较,认为一脉冲一滴(脉冲喷滴过渡)和一脉冲多滴(脉冲射流过渡)在平焊和仰焊位置都能实现有力的轴向过渡,但一脉冲多滴的过渡形式可以有更宽的规范区间。跳弧现象是射流过渡的共同物理本质,只有在出现跳弧现象之后,焊丝端头的液体金属才能产生本质的变化,并出现射流过渡的特点。连续电流射流过渡时,跳弧现象只在引弧初期出现一次,而脉冲电流的脉冲射流过渡时,跳弧现象在每次脉冲电流期间都重复出现。脉冲喷滴过渡和脉冲射流过渡时皆有熔滴在脉冲电流停止后过渡的现象。这种在脉冲电流停止后仍能实现熔滴有力过渡的原因是由于惯性作用和细长金属液柱失稳而自动截成数段,形成分离的小熔滴而实现过渡的。

Using uni-dimentional stress wave theory, the penetration function of arbitra-rily incident stress has been derived. For any given long rod-hard rock penetrationsystem with single or double cylindrical piston, the coefficient of the penetrationdepth of each step (u_k) is a linear transform of a pulse-shape vector (ψ_k), andcan be expressed by means of matric or recurrent formula as: (u_k)=(α_(kp))(ψ_k) oru_k=u~(k-1)e~(-λ)+ψ_k, therefore, the penetration efficiency isη=4θ(1-e~(-λ))~2 (max u_k)~2where (α_(kp))...

Using uni-dimentional stress wave theory, the penetration function of arbitra-rily incident stress has been derived. For any given long rod-hard rock penetrationsystem with single or double cylindrical piston, the coefficient of the penetrationdepth of each step (u_k) is a linear transform of a pulse-shape vector (ψ_k), andcan be expressed by means of matric or recurrent formula as: (u_k)=(α_(kp))(ψ_k) oru_k=u~(k-1)e~(-λ)+ψ_k, therefore, the penetration efficiency isη=4θ(1-e~(-λ))~2 (max u_k)~2where (α_(kp)) is the characteristic square matrix of system: λ and θ are constants. Attempts have been made to compute the penetrating efficiency of the doublecylindrical piston with different cross-section characteristics by a digital computer,with the shake to head length ratio j=4 or 5, which is the normal value forengineering design. The single cylindrical piston may be regarded as a particularcase of the double one. Owing to the fact that all arbitrary specific incident stress pulse can be ap-proached by a step function with a sufficiently short period Δt, this method maybe applicable to the calculation of the efficiency of penetration with arbitrarystress pulse.

冲击凿入效率(施于岩石破碎的能量对冲击能量之比)是评价和设计冲击凿入系统的重要参量.本文运用一维应力波理论导出了任意入射应力波形的凿入函数;对任一给定的单圆柱和双圆柱活塞-长杆硬岩凿入系统,其各阶凿深系数(u~*k)可示为波形向量(ψ_k)的线性变换;由矩阵或递推公式表达为: (u~*_k)=(α_(kp))(ψ_k)或u~*_k=u~*_k-1~(e-λ+ψ_k)则凿入效率: η=4θ(1-e~(-λ))~2(maxu~*_k)~2式中(α_(kp))——系统特性方阵; (λ,θ)——系统常数. 用电子计算机计算了活塞柄头长度比j=(4,5)(工程常用值)两种情况下具有不同断面特性的双圆柱活塞的凿入效率(单圆柱活塞可视为双圆柱活塞的特例). 对任意确定的入射应力波形,都可用足够小周期△t的阶梯函数来逼近,所以这个方法可以推广到任意入射应力波形凿入效率的计算.

 
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