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电弧
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  arc
    Numerical Simulation of D.C. Arc Plasma Torch and the Physical Study of Electron Beam Ion Trap
    直流电弧等离子体发生器的数值模拟及电子束离子阱物理研究
短句来源
    DETERMINATION OF TEMPERATURE DISTRIBUTION AND VALIDITY OF LTE IN AN ARGON ARC PLASMA JET
    氩电弧等离子体射流中温度分布的测定及局域热力学平衡状态的验证
短句来源
    Arc Discharge Ion Plating
    电弧放电离子镀
短句来源
    The Measurement of the Excitation Temperature of Arc Plasma
    电弧等离子体激发温度的测定
短句来源
    A STUDY ON THE TEMPERATURE DISTRIBUTION IN HIGH-PRESSURE SODIUM ARC
    高气压钠电弧的温度分布
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  electrical arc
    Alloy (Sm0.88Dy0.12)Fe2 was prepared with electrical arc furnace in vacuum and the samples were annealed at 860℃ and 700℃ respectively. It is discovered that the magnetostriction |λ11-λ⊥|is 1420×10-6 after annealing at 860℃ for 72 hours. with the x-ray diffraction spectra and the photo of electron microprobe, the discussion was made on the basis of the theory of the diffusion.
    用真空电弧炉熔炼了(Sm0.08Dy0.12)Fe2母合金,在不同温度下进行真空退火,退火温度分别为860℃和700℃,退火时间为72h,发现当经过860℃72h退火后,得到较理想的磁致伸缩系数|λ11-λ⊥|=1420×10-6,对此样品进行了物相、结构以及机理的分析讨论.
短句来源
  “电弧”译为未确定词的双语例句
    Microwave Probe Method to Research Plasma Density of Arc-heated Tunnel
    微波探针法研究电弧风洞等离子体密度
短句来源
    The Measurement on Distribution of Electron Density for VacuumAre by Dynamic Image High-Speed Sampling Computer
    利用动态图象高速微机采集系统对真空电弧电子密度分布的测试
短句来源
    Study of numerical value of helical instability of arcs in rotating magnetic field
    旋转磁场作用下电弧螺旋不稳定性的数值研究
短句来源
    The intermetallic compound PrMn-6Sn-6 was prepared by arc-melting and showed a HoFe-6Sn-6-type(group space:Immm)structure.
    采用电弧熔炼法制备了金属间化合物PrMn6Sn6.X射线衍射表明该化合物具有HoFe6Sn6型(空间群为Immm)晶体结构.
短句来源
    The results show that laser damages markedly depend on the film growth techniques. For example,the laser-induced damage thresholds of the DLC films grown by PVAD and by UBMS are 0.6 J/cm2 and 0.3 J/cm2,respectively.
    本文采用脉冲真空电弧(PVAD)和非平衡磁控溅射(UBMS)技术沉积了DLC膜,对两种DLC膜抗激光损伤特性进行了研究,测试结果表明,两种技术沉积的DLC薄膜激光损伤阈值分别0.6 J/cm2和0.3 J/cm2,PVAD技术比UBMS技术沉积的DLC薄膜具有更高的抗激光损伤阈值。
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  arc
Let Γ be a smooth compact convex planar curve with arc length dm and let dσ=ψ dm where ψ is a cutoff function.
      
The circulant digraphDCn(S) is a directed graph with vertex setZn and arc set {(i,i+s): i ∈ Zn, s ∈ S}.
      
ThenCn(S) is arc-transitive if and only if Xoacts transitively onS.
      
A packing of the complete directed symmetric graph DKv with m-circuits, denoted by (v,m)-DCP, is defined to be a family of arc-disjoint m-circuits of DKv such that any one arc of DKv occurs in at most one m-circuit.
      
It is proved that there is no chaotic group actions on any topological space with free arc.
      
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  electrical arc
An approximate solution of the problem of an electrical arc in a turbulent argon stream is obtained, taking into account convective and radiant energy losses in the discharge channel at atmospheric pressure.
      
A stabilized electrical arc column of variable radius
      
The self-similar solution of the equations describing an axisymmetric electrical arc in a turbulent gas flow is presented.
      
The unique features of a dc electrical arc burning in a long cylindrical channel with an accompanying flow of plasma-forming gas are considered.
      
The purpose of this paper is to examine the properties and parameter dependences of the electrical, thermal, dynamical and radiation quantities of a Hagen-Poiseuille flow in a cylindrical wallstabilized electrical arc.
      
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The present work is to cxtend I. S. Frishman's method① of spectral analysis by means of calculated working crve to spectral work with arcs. Investigations have been made to analyze tungsten in steel (analysis lines chosen: w 4008.76 and W 2397.11) with various are current, slit width and electrode spacing.Our results showed that Frishman's method can be extended to the case of are sources, except that the range of concentration of analysis is narrower than the case of spark sources. It is also found that the...

The present work is to cxtend I. S. Frishman's method① of spectral analysis by means of calculated working crve to spectral work with arcs. Investigations have been made to analyze tungsten in steel (analysis lines chosen: w 4008.76 and W 2397.11) with various are current, slit width and electrode spacing.Our results showed that Frishman's method can be extended to the case of are sources, except that the range of concentration of analysis is narrower than the case of spark sources. It is also found that the coefficient of self-absorption (b) should be determined experimentally.

本文是将的光谱分析计算工作曲线法推广到电弧光谱分析工作中。我们研究了铜中钨的分析(分析线为W.4008.76与W.2397.11),用了不同的电弧电流、狭缝宽度和电极距。研究的结果证明的方法可以推广到电弧光源,但可能分析的浓度范围比火花光源狭小,同时谱线自吸的因子b应从实验确定。

Using a high precision electron-controlled spark source which produces a discharge of about microsecond duration, we studied the cooling of spark channel in air by means of the spectral line normal-temperature method, and determined the cooling time constant τ. Experimental results show, that this time constant depends on the discharge energy according to the relation: τ = 14.3 (CU_0~2/2)~(0,8). By the microscope-photographic method we measured the maximum radius of the spark channel and verified the empirical...

Using a high precision electron-controlled spark source which produces a discharge of about microsecond duration, we studied the cooling of spark channel in air by means of the spectral line normal-temperature method, and determined the cooling time constant τ. Experimental results show, that this time constant depends on the discharge energy according to the relation: τ = 14.3 (CU_0~2/2)~(0,8). By the microscope-photographic method we measured the maximum radius of the spark channel and verified the empirical relation: r_(max)∝(CU_0~2/2)~(0,4). With these two results we prove the relation: τ∝r_(max)~2. On the basis of Frind's theory for the decay of arc temperature, we propose that the cooling time constant of spark channel can be generally described by τ∝r~2/k, (k=n/c_pρ), with the understanding that r and k are both functions of time.Using the recent theoretical data of the thermal and transport properties of air we calculated the k (T) function in the temperature range of 10000°-40000°K. On the experimental basis that τ is a constant in this range of temperature, we calculated the radius of channel as a function of time, or more exactly r (t)/r_(max). This result agrees quite good with the experimental result of Somerville et al. Our comprehension that the cooling time constant of spark channel remaining constant in this range of temperature is the result of a synchronous decay of both the channel radius r(t) and the temperature conductive coefficient k[T(t)] is thus supported.

用一个电子控制的高精确度火花光源产生微秒左右的放电,在火花通道冷却及半径收缩时期,应用谱线极值温度的测量方法,研究了空气中火花温度的变化,从而定出通道冷却的时间常数τ.实验结果表明:该常数与放电能量之间有下列关系:τ=14.3(CU_v~2/2)~(0,8).用直接的显微摄影方法,证实了通道最大半径与放电能量之间有下列经验公式:r_(max)∝(CU_v~2/2)~(0,4).因此证明了:τ∝r_(max)~2的关系.在推广Frind关于电弧温度下降理论的基础上,提出火花通道冷却时间常数的一般关系:τ∝r~2/k,(k=n/c_pρ).在温度为10000°-40000°K的区间中,计算导温系数k随温度变化的曲线,结合实验结果:在此温度区间内τ为常数,计算出通道半径随时间的变化:r(t)/r_(max).该结果与Somerville等测定的结果符合,从而支持了我们的理解:空气中火花通道冷却的时间常数在相当大的温度区间内不变的原因是:通道半径收缩减小与导温系数随时间(亦即随温度)下降的两种过程取得同步的结果.

The present paper gives the results of an analysts of the transient process of discharge by the Laplace transformation method. Observations of the discharge voltage and current were made with an oscillograph. From our study, a general knowledge of the characteristic of such a discharge circuit and the influence of the parameters on line intensities were obtained.

本文从理论和实验两方面,对低压火花放电特性作一些探讨。采用Laplace变换法,分析了线路在引燃、充电和放电三个过程中的过渡过程;探讨了火花与电弧互相转换的条件,以及线路参数对谱线光强的影响。从而对低压火花放电特性有一个较全面的、概略的认识。

 
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