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The effects of different coating layers on lithium metal anode formed by reacting with different controlled atmospheres(argon,CO_2–O_2(2:1),N_2,and CO_2–O_2–N_2(2:1:3))have been investigated.The obtained XRD,second ion mass spectroscopy(SIMS),and scanning probe microscope(SPM)results demonstrate the formation of coating layers composed of Li_2CO_3,Li_3N,and the mixture of them on lithium tablets,respectively.The Li/Li symmetrical cell and Li/S cell are assembled to prove the advantages of the protected lithium tablet on electrochemical performance.The comparison of SEM and SIMS characterizations before/after cycles clarifies that an SEI-like composition formed on the lithium tablets could modulate the interfacial stabilization between the lithium foil and the ether electrolyte. 相似文献
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研究了固定式海关集装箱检测系统用9MeV电子行波直线加速器电子枪的结构特点和束流特性。该电子枪采用钪酸盐阴极,在灯丝电流为2.4A,阳极引出电压为-40kV的工作条件下,由电子枪发射到加速器入口处的脉冲电流强度为300mA,在加速器出口处,束斑截面小于φ2mm;打靶后,产生的X射线剂量率大于30cGy/(min× m)。电子枪的良好特性及束流强度保证了集装箱检测图像所需的高分辨率的要求。为保证满足更换电子枪时的安装要求,利用EGUN程序模拟计算了电子枪的结构及束流特性,为实际装配和使用提供了参考尺寸和调试参数。 相似文献
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磷酸根与磷酸基水化作用之比较—红外光谱研究 总被引:1,自引:0,他引:1
本文运用傅立叶变换红外光谱,对水/NaDEHP/正庚烷反胶束体系中的磷酸根及磷酸三丁酯-水体系中磷酸基的水化作用进行了研究。 相似文献
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金属锂因为其优秀的特性被认为是未来锂电池负极的最终之选。然而目前金属锂负极在旧有液态体系中的研究陷入瓶颈,在新兴固态体系中的挑战层出不穷。想要实现金属锂负极的实用化,必须加深对金属锂负极基础科学问题的认识。本文系统论述了多空间尺度下金属锂的电极行为与对应的表征技术。首先综述了多空间尺度下金属锂负极的基础科学和应用技术问题,结合近年来的工作,对全空间尺度下的先进表征手段做了梳理,分析了从原子级到宏观尺度各种表征手段的技术特点,并重点讨论了各类表征技术在研究固态体系中金属锂负极时的特点与可能的发展方向。 相似文献
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Polarization-independent terahertz wave modulator based on graphene-silicon hybrid structure 下载免费PDF全文
In this study, we propose and demonstrate a broadband polarization-independent terahertz modulator based on graphene/silicon hybrid structure through a combination of continuous wave optical illumination and electrical gating.Under a pump power of 400 mW and the voltages ranging from-1.8 V to 1.4 V, modulation depths in a range of-23%–62% are achieved in a frequency range from 0.25 THz to 0.65 THz. The modulator is also found to have a transition from unidirectional modulation to bidirectional modulation with the increase of pump power. Combining the Raman spectra and Schottky current–voltage characteristics of the device, it is found that the large amplitude modulation is ascribed to the electric-field controlled carrier concentration in silicon with assistance of the graphene electrode and Schottky junction. 相似文献
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An equivalent circuit model for the analysis and design of terahertz (THz) metamaterial filters is presented.The proposed model,derived based on LMC equivalent circuits,takes into account the detailed geometrical parameters and the presence of a dielectric substrate with the existing analytic expressions for self-inductance,mutual inductance,and capacitance.The model is in good agreement with the experimental measurements and full-wave simulations.Exploiting the circuit model has made it possible to predict accurately the resonance frequency of the proposed structures and thus,quick and accurate process of designing THz device from artificial metamaterials is offered. 相似文献
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