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Effect of Pebble Bed Electrical Resistivity on Electromagnetic Force in WCCB TBM 卵石层电阻率对 WCCB TBM 电磁力的影响
IF 1.5 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-19 DOI: 10.1109/tps.2024.3441528
Wenhai Guan, Kentaro Hattori, Takanori Hirose, Yoshinori Kawamura
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引用次数: 0
Effect of Low-Pressure Glow Discharge Cold Plasma on the Quality Characteristics of Button Mushroom (Agaricus bisporus) 低压辉光放电冷等离子体对双孢蘑菇品质特征的影响
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-16 DOI: 10.1109/TPS.2024.3439851
M. M. Pragalyaashree;V. Arun Joshy;R. Freeda Blessie;D. Tiroutchelvame;Shanmuga Velayutham
The present study was carried out to examine the efficacy of low-pressure glow discharge cold plasma on the quality characteristics of button mushrooms (Agaricus bisporus). Low-pressure (0.6 mbar) glow discharge was obtained to generate a cold plasma at 200 V with an electrode gap of 11 cm in the plasma chamber. Mushroom samples were exposed to cold plasma for different durations of time (5–15 min). The physical, chemical, and microbial qualities of the treated and untreated mushroom samples were compared. The plasma treatment on mushroom did not adversely affect the critical quality parameters, i.e., phenolic content, total antioxidant activity, elemental composition, surface morphology, color, texture, pH, and weight loss. The result of insignificance was observed with pH, texture, and weight loss for the treated and untreated samples. It was inferred from the results that there was a slight loss in nutritional properties as the treatment time increased but a greater reduction in microbial population. The shorter the duration of exposure, the greater the quality retention. The mushrooms treated with cold plasma for a period of 15 min showed higher elimination of microorganism. The scanning electron microscope (SEM) results revealed that the topology and the roughness of the original smooth surfaces of the virgin substrate were dramatically changed after plasma treatment.
本研究旨在探讨低压辉光放电冷等离子体对金针菇(Agaricus bisporus)品质特征的影响。通过低压(0.6 毫巴)辉光放电产生 200 伏的冷等离子体,等离子体室的电极间隙为 11 厘米。蘑菇样品暴露在冷等离子体中的时间长短不一(5-15 分钟)。比较了处理过和未处理过的蘑菇样品的物理、化学和微生物质量。对蘑菇进行等离子处理不会对关键质量参数(即酚含量、总抗氧化活性、元素组成、表面形态、颜色、质地、pH 值和重量损失)产生不利影响。经处理和未经处理的样品在 pH 值、质地和失重方面的结果均不明显。从结果中可以推断出,随着处理时间的延长,营养特性略有下降,但微生物数量减少较多。暴露时间越短,质量保持率越高。用冷等离子体处理 15 分钟的蘑菇显示出较高的微生物消除率。扫描电子显微镜(SEM)结果显示,经过等离子处理后,原生基质原有光滑表面的拓扑结构和粗糙度发生了显著变化。
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引用次数: 0
STEP’s Plan for Understanding REBCO Coated Conductors in the Fusion Environment STEP 在聚变环境中了解 REBCO 涂层导体的计划
IF 1.5 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-15 DOI: 10.1109/tps.2024.3432992
William Iliffe, Simon Chislett-McDonald, Fiona Harden, Kirk Adams, James Tufnail, Chris Grovenor, Susannah Speller, Aidan Reilly, Ezzat Nasr
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引用次数: 0
Damping Effects on the Spectrum of Solitary Structures in Cylindrical and Spherical Geometry 阻尼对圆柱和球形几何中孤岛结构频谱的影响
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-14 DOI: 10.1109/TPS.2024.3438559
Laxmikanta Mandi;Uday Narayan Ghosh;Swarniv Chandra;Chinmay Das;Prasanta Chatterjee
The dust-ion collisional effect is investigated for dust ion acoustic waves (DIAWs) in the spherical and cylindrical geometry. Using the reductive perturbation technique (RPT), the evolution equation is derived with an additional damping term. An approximate analytical time-dependent solitary wave solution is obtained for the evolution equation in nonplaner geometry. It is seen that dust ion collisional frequency plays an important role in the existence region of the solitary wave structure in the nonplanar geometry. It is also seen that dust-ion collisional frequency and spectral index $kappa $ have a significant role in the amplitude and width of the solitary wave. Additionally, we have numerically investigated the parametric influence on the solitonic evolution mechanism which will help understand the process better.
研究了球形和圆柱形尘埃离子声波(DIAWs)的尘埃离子碰撞效应。利用还原扰动技术(RPT),导出了带有附加阻尼项的演化方程。对于非平面几何中的演化方程,得到了一个近似的随时间变化的孤波解析解。结果表明,尘埃离子碰撞频率在非平面几何中孤波结构的存在区域起着重要作用。同时还发现尘埃离子碰撞频率和光谱指数$kappa $对孤波的振幅和宽度有重要影响。此外,我们还对参数对孤波演化机制的影响进行了数值研究,这将有助于更好地理解这一过程。
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引用次数: 0
Research on Analytical Model of Synchronous Discharge of Capacitive Pulsed Power Supply 电容式脉冲电源同步放电分析模型研究
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-14 DOI: 10.1109/TPS.2024.3437478
Wanyu Liu;Kun Liu;Wenchao Li;Shikuo Cheng;Yaohong Sun;Ping Yan
Capacitive pulsed power supply (CPPS) has been obtained widespread applications because of its plenty of superiorities. The circuit model is developed, and the synchronous discharge process is investigated at first. Then, the synchronous discharge analytical model is developed for the system. The correctness of the analytical model is validated by simulation. To solve the power parameters quickly, the PC software is developed based on this analytical model to meet the experimental requirements. Finally, taking an experimental system as an example, the accuracy of the proposed model is demonstrated by comparing the simulation and experimental results. By developing the synchronous discharge analytical model, it provides an essential reference for CPPS control strategy for further investigation.
电容式脉冲电源(CPPS)因其诸多优越性而得到广泛应用。本文首先建立了电路模型,并研究了同步放电过程。然后,为系统建立了同步放电分析模型。通过仿真验证了分析模型的正确性。为了快速求解功率参数,基于该分析模型开发了满足实验要求的 PC 软件。最后,以一个实验系统为例,通过比较仿真和实验结果,证明了所提出模型的准确性。通过建立同步放电分析模型,为进一步研究 CPPS 控制策略提供了重要参考。
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引用次数: 0
Design and Analysis of Halbach Array PM Inner Rotor Slotted Stator Compensated Pulsed Alternator 哈尔巴赫阵列永磁内转子开槽定子补偿脉冲交流发电机的设计与分析
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-13 DOI: 10.1109/TPS.2024.3438278
Zhizhou Zhang;Jinchu Zhang;Weilong Zhao;Yueliang Pan
Compensated pulsed alternator (CPA) as an inertial energy storage pulsed power supply integrates the functions of flywheel inertial energy storage, electromechanical energy conversion, and pulsed discharge, and has many advantages such as high energy storage density, large power density, and small size. A new type of Halbach array permanent magnet (PM) inner rotor slotted stator passively CPA (SSPCPA) is proposed in this article; then, the scheme for the integration of the motor with SSPCPA is presented; next, the design processes for both the rotor and stator sides are given to determine the main structural size parameters of SSPCPA. Following this, the impedance of the armature winding of SSPCPA is calculated, and mathematical models are established for both single-phase discharge and two-phase rectified parallel discharge under load conditions. Subsequently, using Maxwell and Simplorer software, a simulation analysis is conducted for discharge with 1 m $Omega $ and $1~mu $ H loads. Finally, the simulation results demonstrate that the design of SSPCPA can achieve the predetermined pulsed discharge performance.
补偿脉冲交流发电机(CPA)作为一种惯性储能脉冲电源,集飞轮惯性储能、机电能量转换、脉冲放电等功能于一体,具有储能密度高、功率密度大、体积小等诸多优点。本文提出了一种新型哈尔巴赫阵列永磁(PM)内转子开槽定子无源 CPA(SSPCPA);然后,介绍了电机与 SSPCPA 的集成方案;接着,给出了转子和定子两侧的设计过程,以确定 SSPCPA 的主要结构尺寸参数。随后,计算了 SSPCPA 电枢绕组的阻抗,并建立了负载条件下单相放电和两相整流并联放电的数学模型。随后,使用 Maxwell 和 Simplorer 软件对 1 m $Omega $ 和 1~mu $ H 负载下的放电进行了仿真分析。最后,仿真结果表明,SSPCPA 的设计可以实现预定的脉冲放电性能。
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引用次数: 0
Optimization of Processing Parameters in Deep Penetration Electron Beam Welding of Stainless Steel 316L for ITER Diagnostic Shield Module Application 优化 ITER 诊断屏蔽模块应用中不锈钢 316L 深穿透电子束焊接的加工参数
IF 1.5 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-13 DOI: 10.1109/tps.2024.3437411
Heejin Shim, Jaemin Kim, MunSeong Cheon, Duhee Han, Sunil Pak
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引用次数: 0
Vulnerability of L-Band LNA to the Out-of-Band HPM L$ 波段低噪声放大器易受带外 HPM 影响的问题
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-13 DOI: 10.1109/TPS.2024.3439130
Mingwen Zhang;Chunguang Ma;Ruilong Song;Yong Luo
In this article, the radio frequency (RF) performance degradation induced by out-of-band high-power microwave (HPM) is studied by simulation and experiment. The latent threat of the X-band HPM to the L-band low-noise amplifier (LNA) is verified by experiments. Due to the nonlinearity of active devices, the gain decreases under HPM inference, the nonlinear response of the LNA is investigated from the physical model, and the injection experiment shows that both the duty ratio and peak power of the HPM significantly influence the LNA gain.
本文通过仿真和实验研究了带外大功率微波(HPM)引起的射频(RF)性能下降。实验验证了 X 波段 HPM 对 L 波段低噪声放大器(LNA)的潜在威胁。由于有源器件的非线性,在 HPM 的推断下增益会下降,从物理模型中研究了 LNA 的非线性响应,注入实验表明 HPM 的占空比和峰值功率都会显著影响 LNA 的增益。
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引用次数: 0
Design of the Internal Fuse Dimension for HV Shunt Capacitor in UHV Transmission Projects 特高压输电项目中高压并联电容器内部熔断器的尺寸设计
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-13 DOI: 10.1109/TPS.2024.3437156
Zijian Wang;Liqiang Wei;Fei Yan;Yongli Wu;Zichen Wang;Yanfeng Ma
The internal fuse plays an important role in the protection of high-voltage (HV) shunt capacitors. However, there is still a lack of research on the design of the internal fuse for HV shunt capacitors. In this article, an experimental platform is built to investigate the effect of the diameter on the fusing characteristics of the fuse. The maximum nonfusing current action integral and the minimum fusing current action integral of fuses with different diameters in the range of 0.3–0.7 mm are obtained. Then, the equivalent circuits of the capacitor unit are analyzed when there is a short between terminals or element breakdown. The current flowing through the fuses with different diameters and lengths is studied, and the current action integral is calculated. Comparing them with the maximum nonfusing current action integral and the minimum fusing current action integral obtained from the experiments, the selection range of fuse diameter and length can be determined. In order to verify the rationality of the fuse design method, the internal fuse of a 668 kvar HV shunt capacitor used in ultrahigh-voltage (UHV) transmission projects is designed and validated experimentally. This article will provide a reference for the internal fuse dimension design of HV shunt capacitors.
内部熔断器在保护高压并联电容器方面发挥着重要作用。然而,目前对高压并联电容器内部熔断器的设计还缺乏研究。本文搭建了一个实验平台,研究直径对熔断器熔断特性的影响。实验得出了 0.3-0.7 mm 范围内不同直径熔断器的最大非熔断电流作用积分和最小熔断电流作用积分。然后,分析了电容器单元在端子间短路或元件击穿时的等效电路。研究了流经不同直径和长度保险丝的电流,并计算了电流作用积分。将它们与实验得出的最大非熔断电流作用积分和最小熔断电流作用积分进行比较,可以确定熔断器直径和长度的选择范围。为了验证熔断器设计方法的合理性,本文对特高压输电工程中使用的 668 kvar 高压并联电容器的内部熔断器进行了设计和实验验证。本文将为高压并联电容器内部熔丝尺寸设计提供参考。
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引用次数: 0
On the Discharge Modes of 10-ns Atmospheric Pressure Helium Plasma Jets 关于 10-ns 常压氦等离子体射流的放电模式
IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Pub Date : 2024-08-13 DOI: 10.1109/TPS.2024.3436589
Md Ziaur Rahman;Edwin A. Oshin;Chunqi Jiang
Three discharge modes—guided streamer, transient spark, and low-impedance spark—were investigated here using a hollow needle-to-plate electrode configuration driven by 10-ns voltage pulses with a helium flow at 70 sccm at atmospheric pressure. The criteria of the discharge modes were assessed using energy deposition as well as spatiotemporally resolved rotational temperatures, which were determined by measuring the rotational temperature of the second positive system of $N_{2}$ . Guided streamer has the lowest energy deposition per pulse and the lowest rotational temperature among the three modes. As the discharge transitions from a streamer to a transient spark, then to a low-impedance spark, both the energy deposition and rotational temperature increase significantly. In addition, during the first 20 ns of the discharge, the mean energy of the excited states was strongly correlated with the external electric field and modes of the discharge; higher mean rotational energy was observed near the high-voltage needle electrode for streamers but closer to the ground plate for sparks.
本文研究了三种放电模式--导引流、瞬态火花和低阻抗火花--采用空心针对板电极配置,在大气压下以 70 sccm 的氦气流驱动 10-ns 电压脉冲。放电模式的标准是通过能量沉积和时空分辨旋转温度来评估的,旋转温度是通过测量 $N_{2}$ 第二正系的旋转温度确定的。在三种模式中,导引流每个脉冲的能量沉积最低,旋转温度也最低。当放电从流线型过渡到瞬态火花,再过渡到低阻抗火花时,能量沉积和旋转温度都会显著增加。此外,在放电的前 20 毫微秒期间,激发态的平均能量与外部电场和放电模式密切相关;在高压针电极附近观察到流束的平均旋转能量较高,而在火花中则更靠近接地板。
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引用次数: 0
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IEEE Transactions on Plasma Science
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