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201.
Yan Liu Jiqing Wang Huaizhong Xing Naiyun Tang Bin Lv Huibing Mao Qiang Zhao Yong Zhang Ziqiang Zhu 《Solid State Communications》2009,149(3-4):156-159
The authors theoretically investigate a triple-barrier ferromagnetic resonant-tunneling diode composing nonmagnetic couple wells and three GaMnN magnetic barriers, in which two kinds of antiparallel configurations are formed by changing the relative orientation of magnetization in the barriers. Based on a two-band model, the achievement of large magnetocurrents in the resonant bias regime is proposed under an optimal magnetization configuration. The magnetocurrents in both antiparallel configurations of triple-barrier system are much higher than that in double-barrier structure. 相似文献
202.
A new subdivision method for grating-based displacement sensor was proposed in the present study, which takes advantages of imaging array's high resolution and pixels’ good uniformity in the space. In this method, the magnified grating image is received by imaging array and grating pitch is directly subdivided by pixels, which is quite different from that moiré fringe is subdivided by complex subsequent circuits in moiré-type displacement sensor. The displacement is statistically calculated by using the whole grating image, which greatly eliminates the errors arising from illumination, electrical signals’ fluctuation, grating defect, and so on. Therefore, the subdivision method is easy to obtain signal with high signal-to-noise ratio, insensitive to some external factors, and able to attain high measurement precision with low cost. In this paper, the principle of subdivision method was illuminated, the systemic resolution was theoretically discussed, the measurement precision was experimentally checked, and the uncertainty of measurement was analyzed. The subdivision system consisted of the grating with 20-μm pitch and the CMOS image sensor with the pixels of 1280×1024 had the resolution of 0.04 μm, and the maximum displacement error was less than 0.4 μm, which has been tested in the Abbe comparator platform. 相似文献
203.
Chongfeng Guo Shuiting Wang Tao Chen Lin Luan Yan Xu 《Applied Physics A: Materials Science & Processing》2009,94(2):365-371
A series of double molybdates phosphors AEu(MoO4)2 (A = Li, Na, K and Ag) have been prepared by sol-gel method. Their crystal structure and luminescent properties have also
been investigated in a comparable way. The crystallization processes of the phosphor precursors were characterized by X-ray
diffraction (XRD) and thermogravimetry-differential thermal analysis (TG-DTA). Field emission scanning electron microscopy
(FE-SEM) was also used to characterize the shape and size distribution of the phosphors. Samples except KEu(MoO4)2 showed tetragonal scheelite structure in the range of our experiments, and no phase transition appeared. Phosphor KEu(MoO4)2 possessed two structures, and the phase transition took place at about 800°C. All samples with high purity could be obtained
at about 500°C for 5 hours, and they all showed intense red light peaked at 616 nm originated from 5D0→7F2 emission of Eu3+ under the excitation of 465 nm or 394 nm light. The excitation spectra of phosphors AEu(MoO4)2 (A = Li, Na, and K) are composed of a strong broad charge transfer (CT) band and some sharp lines, and the relative intensity
of CT band, the two strongest absorption lines at 395 nm and 465 nm are comparative, so these three phosphors are good red
phosphor candidates for violet or blue LEDs. For the excitation spectrum of phosphor AgEu(MoO4)2, intensities of CT band and the absorption line at 395 nm are much weaker than that of line at 465 nm, thus phosphor AgEu(MoO4)2 is only suit for GaN-based blue LED. 相似文献
204.
Ni、Co/AAO纳米有序阵列复合结构光吸收特性的比较研究 总被引:2,自引:3,他引:2
在多孔阳极氧化铝(AAO)模板中分别沉积金属镍(Ni)、钴(Co),制备了Ni/AAO和Co/AAO纳米有序阵列复合结构,对其光吸收特性进行了比较研究。实验结果表明.相同结构参量的模板中,Ni、Co纳米粒子的表观形状随沉积时间的变化规律基本一致.但Co/AAO及Ni/AAO复合结构的光吸收特性却有较大差异。Ni/AAO复合结构表现出间接带隙半导体的光学特征.而Co/AAO复合结构具有直接带隙半导体的光学特征。同时,随金属沉积量的增加,Ni/AAO吸收边的红移量仅约为13nm.而Co/AAO复合结构的吸收边红移量却超过了80nm。用Maxwell-Garnett(M-G)理论分析了导致二者光吸收特性存在较大差异的主要原因。 相似文献
205.
206.
207.
研究了邻羟基苯甲酸(OHBA)的常规拉曼散射(NRS)光谱以及其吸附在Au纳米颗粒上的表面增强拉曼散射(SERS)光谱。以氯金酸为原料,柠檬酸三钠为还原剂,用化学还原法制备了球形的金纳米粒子溶胶,采用激光显微拉曼光谱仪(激发波长为785 nm),测定OHBA分子的NRS光谱及其吸附在Au纳米颗粒上的SERS光谱。同时,应用密度泛函理论(DFT),在B3LYP/6-31+G**(C,H,O)/LANL2DZ(Au)水平上,对OHBA分子进行了结构优化,在此基础上计算了OHBA分子的NRS光谱以及其吸附在Au纳米颗粒上两种不同吸附构型下的SERS光谱,并和实验值进行比较。结果表明,OHBA分子通过羧基吸附构型的计算值比通过羟基吸附构型的计算值与实验值符合的更好。最后,利用GaussView可视化软件对其振动模式进行了全面归属。通过对邻羟基苯甲酸分子拉曼谱峰的详细指认能够得出:Au溶胶中的邻羟基苯甲酸分子,是通过羧基倾斜地吸附在Au纳米颗粒表面的。可视化软件直观形象地展示出了该分子的结构特征和分子基团振动情况,对其振动峰位的归属提供了重要依据。本文工作对推进邻羟基苯甲酸在生物医药等领域进一步的应用具有重要作用。 相似文献
208.
玻璃纤维增强复合材料被广泛应用于航天、航空及其他军民各领域,它在制备和使用过程中通常会出现多个缺陷。太赫兹时域光谱成像技术有望成为玻璃纤维增强复合材料无损检测的有力补充手段。在太赫兹时域光谱成像过程中,可以选取时域或频域波形中的不同参数来进行成像。对于不同的缺陷,能够有效地对其进行检测的参数是不一样的。采用基于小波分解的图像融合方法将多幅不同参数获取的太赫兹反射图像结合起来,得到一幅包含所有缺陷信息的新图像。研究表明,基于小波分解的图像融合方法在太赫兹无损检测中的应用,能够获取单一参数成像无法检测的缺陷信息,为复合材料太赫兹图像后期处理提供了新的技术方法。 相似文献
209.
210.
Yi Song Jiang-Li Ni Zhang-Yin Wang Yan Lu Lian-Fang Han 《International Journal of Theoretical Physics》2017,56(10):3175-3187
We present a new scheme for deterministically realizing the mutual interchange of quantum information between two distant parties via selected quantum states as the shared entangled resource. We first show the symmetric bidirectional remote state preparation (BRSP), where two single-qubit quantum states will be simultaneously exchanged in a deterministic manner provided that each of the users performs single-qubit von Neumann measurements with proper measurement bases as well as appropriate unitary operations, depending essentially on the outcomes of the prior measurements. Then we consider to extend the symmetric protocol to an asymmetric case, in which BRSP of a general single-qubit state and an arbitrary two-qubit state is investigated successfully. The necessary quantum operations and the employed quantum resources are feasible according to the present technology, resulting in that this protocol may be realizable in the realm of current physical experiment. 相似文献