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1.
基于光电倍增管研制了一套无触发信号的双通道光学探测系统, 并组装了测试样机, 实现了对沿面介质阻挡放电(SDBD)等离子体约化电场的测量, 进而通过BOLSIG+软件获得了电子能量. 采用原位紫外吸收光谱和傅里叶变换红外光谱, 研究了SDBD等离子体在不同电压和频率下的化学产物的浓度变化, 并结合空气等离子体化学反应揭示了产物相互作用的微观机理. 结果表明, 电子能量能够改变电子碰撞反应的速率系数, 调控化学反应的源头活性粒子的浓度, 进而影响到化学产物的生成和猝灭. 相似文献
2.
A barrier swaption gives its owner the right but not the obligation to enter into an underlying interest rate swap and only becomes activated (or extinguished) if the underlying reaches the given barrier. This paper discusses four types of barrier swaptions under the framework of uncertain finance theory, which are up‐and‐in payer swaption, down‐and‐in receiver swaption, up‐and‐out receiver swaption, and down‐and‐out payer swaption, and gives pricing formulae to calculate the price of corresponding barrier swaptions. Furthermore, corresponding numerical methods are presented when explicit solutions are unavailable. A numerical example is documented to illustrate our methods. 相似文献
3.
The dielectric barrier discharge of helium in a 6 mm gap at atmospheric pressure was studied. In this paper, the influence of electric field distribution on the uniformity of DBD is analyzed theoretically and verified by experiments. The experimental results show that the mesh electrode produces a local enhancement effect by affecting the electric field and then produces corona discharge, which provides seed electrons for the subsequent discharge process. The effects of mesh diameter and size on discharge uniformity and stability are analyzed, the electrode structure parameters are optimized, the method of a segmented electrode is proposed, and the discharge process and charge distribution are studied. The electrical diagnosis results of plasma technology show that the segmented mesh electrode reduces the breakdown voltage of DBD and increases the charge deposition. 相似文献
4.
We propose a novel device structure with a WO3/NiOx bilayer to improve the hole injection ability in QLEDs fabricated mainly by a solution-based process. First, we employed a spin-coated NiOx thin film as a hole injection layer (HIL) to replace Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) PEDOT:PSS which corrodes indium tin oxide (ITO) used as an anode in QLEDs. We showed a simply optimized annealing process, instead of a rather complicated process like doping, can improve the electrical conductivity of the NiOx thin film. The reason for the dependency of conductivity on the post-metallization annealing is because of the change of the total amount of Ni vacancy in the NiOx thin film as a function of annealing temperature: The electrical conductivity of the NiOx thin film annealed at 275 °C was the best in this work. Second, we inserted the WO3 thin film in between ITO electrode and NiOx HIL to form an ITO/WO3/NiOx structure which reduces the hole injection barrier to 0.35 eV, resulting in the excellent characteristic in view of charge balance. Finally, we measured the properties of QLEDs with the WO3/NiOx bilayer to check the effects of the proposed device structure and showed the substantial improvement of the electrical conductivity of NiOx, the luminance, and the current efficiency of the QLEDs. 相似文献
5.
本文通过简单的一步水热法得到Ni2P-NiS双助催化剂,之后采用溶剂蒸发法将Ni2P-NiS与g-C3N4纳米片结合构建获得无贵金属的Ni2P-NiS/g-C3N4异质结。研究结果表明,优化后的复合材料具有良好的光催化产氢活性,其产氢速率最高可到6892.7 μmol·g-1·h-1,分别为g-C3N4 (150 μmol·g-1·h-1)、15%NiS/g-C3N4 (914.5 μmol·g-1·h-1)和15%Ni2P/g-C3N4 (1565.9 μmol·g-1·h-1)的46.1、7.5和4.4倍。这主要归因于Ni2P-NiS相比Ni2P和NiS单体具有更好的载流子转移能力,其与g-C3N4形成的肖特基势垒能有效促进光生载流子在二者界面上的分离,同时Ni2P-NiS能进一步降低析氢过电势,进而显著增强了表面析氢反应动力学。本研究为开发稳定、高效的非贵金属产氢助剂提供了实验基础。 相似文献
6.
为寻求新型热障涂层用陶瓷材料,本文采用高温固相烧结法制备了(Sm0.5Gd0.2Nd0.3)2(Hf0.3Ce0.7)2O7复合氧化物。利用XRD分析了其晶体结构,SEM分析其显微组织,膨胀仪测试其热膨胀性能,激光热导仪测试其热扩散系数。结果表明,成功制备了具有单一萤石晶体结构的(Sm0.5Gd0.2Nd0.3)2(Hf0.3Ce0.7)2O7复合氧化物。其显微组织结构致密,晶界清晰无其他相存在。由于复杂的元素组成和较大的原子量,其热导率明显低于7YSZ和Sm2Ce2O7。其较低的热膨胀系数则归因于B位离子较小的离子半径,但其热膨胀系数依然满足热障涂层的要求。 相似文献
7.
K-ion batteries (KIBs) attract considerable attention due to the abundance of K, high-working voltages, and chemical similarity with Li, enabling the utilization of mature Li-ion technology. However, shortage of high-performance anode materials is a critical obstacle for the development of KIBs. Through first-principles swarm-intelligence structural search, we identify a potential anode material, the C6S monolayer, which provides not only a remarkably high specific capacity of 1546 mAh/g but also a low diffusion barrier of 0.11 eV and a low open-circuit voltage of 0.21 V. Inherent metallicity originates from delocalized π electrons. 相似文献
8.
利用密度泛函理论(DFT)研究了M12Ni(M=Pt, Sn, Cu) 3种双金属合金团簇的电子活性和结构稳定性, 并探讨了甲烷干法重整反应(DRM)在M12Ni双金属团簇表面的反应能量变化情况. 经比较发现甲烷脱氢和二氧化碳活化过程在Pt12Ni团簇表面进行需克服的活化能垒最低, 反应最易进行. Sn12Ni团簇上生成碳需要较高的活化能, 说明Sn12Ni团簇能够有效抑制焦碳的生成, 一定程度上克服了碳沉积导致的催化剂失活现象, 并且Sn12Ni团簇在C *和CH *氧化过程中表现出最佳的催化活性. Cu12Ni团簇仅在甲烷脱氢过程中表现出较为优异的催化活性. 相似文献
9.
《Journal of Saudi Chemical Society》2020,24(9):673-682
A single dielectric barrier discharge (DBD) low-temperature plasma reactor was set up, and toluene was selected as the representative substance for volatile organic compounds (VOCs), to study the reaction products and degradation mechanism of VOCs degradation by low-temperature plasma. Different parameters effect on the concentration of O3 and NOx during the degradation of toluene were studied. The exhaust in the process of toluene degradation was continuously detected and analyzed, and the degradation mechanism of toluene was explored. The results showed that the concentration of O3 increased with the increase of the power density and discharge voltage of the plasma device. However, as the initial concentration of toluene increased, the concentration of O3 basically keep steady. The concentration of NOx in the by-products increased with the discharge voltage, power density, and initial concentration of toluene in the plasma device, and the concentration of NO2 was much higher than the concentration of NO. The degradation process of toluene was detected and analyzed. The results showed that the degradation mechanism of toluene by plasma includes high energy electron bombardment reaction, active radical reaction and ion molecule reaction. Among them, the effect of high-energy electrons on toluene degradation is the largest, followed by the effect of free radicals, in which oxygen radicals participated in the reaction mainly through the formation of C–O bond, CO bond, (CO)–O– bond and –OH radical, while nitrogen radicals participate in the reaction mainly through the formation of C–NH2, (CNH)- bond, CN bond and C–NO2 bond. The results can provide some data supports for the study of low-temperature plasma degradation of VOCs. 相似文献
10.
Chun-Yaung Lu Tsung-Yen Lee Chia-Chun Chou 《International journal of quantum chemistry》2020,120(1):e26055
The moving boundary truncated grid (TG) method is used to study wave packet dynamics of multidimensional quantum systems. As time evolves, appropriate Eulerian grid points required for propagating a wave packet are activated and deactivated with no advance information about the dynamics. This method is applied to the Henon-Heiles potential and wave packet barrier scattering in two, three, and four dimensions. Computational results demonstrate that the TG method not only leads to a great reduction in the number of grid points needed to perform accurate calculations but also is computationally more efficient than the full grid calculations. 相似文献