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We present a novel perspective on characterizing the spectral correspondence between nodes of the weighted graph with application to image registration. It is based on matrix perturbation analysis on the spectral graph. The contribution may be divided into three parts. Firstly, the perturbation matrix is obtained by perturbing the matrix of graph model. Secondly, an orthogonal matrix is obtained based on an optimal parameter, which can better capture correspondence features. Thirdly, the optimal matching matrix is proposed by adjusting signs of orthogonal matrix for image registration. Experiments on both synthetic images and real-world images demonstrate the effectiveness and accuracy of the proposed method. 相似文献
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Qianyao Fang Wuke Wei Chengcai Wu Prof. Dr. Xin Su Prof. Dr. Suli Wu 《欧洲无机化学杂志》2023,26(1):e202200486
In this work, we demonstrate a new two-step method for preparing monodisperse ZnS colloidal spheres. The method contains a hot-injection step for making primary particles as seeds and a heating-up step for aggregation growth of secondary colloidal spheres. Instead of the most commonly used thioacetamide in previous studies, thiourea (TU) was selected as the sulfur source. The temperature-dependent thermal decomposition rate of TU makes the releasing of S2− and nucleation of ZnS under proper kinetic control, meanwhile making the reaction a mild and acid-free process. By separating the two steps and using a milder sulfur precursor, monodisperse ZnS colloidal spheres have been prepared. Their diameters can be delicately tuned in the range from 54 to 172 nm through simply changing the amount of Zn and S precursor. The optical properties of the obtained ZnS spheres were studied by extinction and PL measurements, and they exhibit size-dependent optical behavior. 相似文献
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LI Hongshuang WANG Xinran DUAN Guiyun XIA Chengcai XIAO Yuliang LI Furong GE Yanqing YOU Guirong HAN Junfen FU Xiaopan TAN Shanhui WANG Rongwei 《高等学校化学研究》2016,32(6):929-937
In this paper, we described the synthesis of 2-aminothiazole sublibrary containing methyl, bromo, phenyl or butylidene at 4- or/and 5-position of its core. All target compounds were evaluated for their antitumor activities against human lung cancer cell line H1299 and human glioma cell line SHG-44. Among the compounds screened, 4,5,6,7-tetrahydrobenzo[d]thiazole(26b) exhibited the most potent antitumor activities with IC50 values of 4.89 and 4.03 μmol/L against the two tested cell lines, respectively. Preliminary structure-activity relationship(SAR) studies of these compound were subsequently investigated. 相似文献
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本文研究了富营养化水栽培下蓼科植物酸模叶蓼,野荞麦和羊蹄蒸腾特点及与营养吸收的关系。 相似文献
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通过在WO3纳米片表面负载ZnFe2O4纳米颗粒,构建了一系列S型异质结光催化剂ZnFe2O4/WO3,并研究了其光催化CO2还原性能。在没有助催化剂和牺牲剂的条件下,所制备的ZnFe2O4/WO3复合材料可对CO2与水蒸汽进行光催化反应。优化后的材料光照5 h后CO2还原产物CO和CH4的产量分别为7.87和4.88 μmol·g-1。相对于单相组分,CO和CH4的产量明显提高。光催化活性的提高,归因于ZnFe2O4和WO3异质结的形成以及光生载流子的S型电荷传输模式。 相似文献
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通过在WO3纳米片表面负载ZnFe2O4纳米颗粒,构建了一系列S型异质结光催化剂ZnFe2O4/WO3,并研究了其光催化CO2还原性能。在没有助催化剂和牺牲剂的条件下,所制备的ZnFe2O4/WO3复合材料可对CO2与水蒸汽进行光催化反应。优化后的材料光照5 h后CO2还原产物CO和CH4的产量分别为7.87和4.88 μmol·g-1。相对于单相组分,CO和CH4的产量明显提高。光催化活性的提高,归因于ZnFe2O4和WO3异质结的形成以及光生载流子的S型电荷传输模式。 相似文献
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混合式非致冷焦平面器件芯片工艺研究 总被引:1,自引:0,他引:1
随着红外热成像应用技术的不断发展,国内外研究和开发低成本非致冷热像仪的兴趣越来越浓。而开发非致冷热像仪的关键技术在于开发其核心部件非致冷焦平面器件。本文对致冷型焦平面器件和非致冷型焦平面器件进行简单的比较,简要报导国内外非致冷焦平面器件的发展状况、规模、目前达到的水平及其应用,着重叙述混合式128×128非致冷焦平面器件芯片的研制工艺。 相似文献
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Yunjie Luo Xiulian Wang Jue Chen Chengcai Luo Yong Zhang Yingming Yao 《Journal of organometallic chemistry》2009,694(9-10):1289-1296
Alkane elimination reaction between Ln(CH2SiMe3)3(THF)2 (Ln = Y, Lu) with one equivalent of the amidines with different steric demanding HL ([CyC(N-2,6-iPr2C6H3)2]H (HL1), [CyC(N-2,6-Me2C6H3)2]H (HL2), [PhC(N-2,6-Me2C6H3)2]H (HL3)) in THF afforded a series of mono(amidinate) rare earth metal bis(alkyl) complexes [CyC(N-2,6-iPr2C6H3)2]Ln(CH2SiMe3)2(THF) (Ln = Y (1), Lu (3)), [CyC(N-2,6-Me2C6H3)2]Ln(CH2SiMe3)2(THF)2 (Ln = Y (4), Lu (6)), and [PhC(N-2,6-Me2C6H3)2]Y(CH2SiMe3)2(THF)2 (7) in 75–89% isolated yields. For the early lanthanide metal Nd, THF slurry of NdCl3 was stirred with three equiv of LiCH2SiMe3 in THF, followed by addition of one equiv of the amidines HL1 or HL2 gave an “ate” complex [CyC(N-2,6-iPr2C6H3)2]Nd(CH2SiMe3)2(μ-Cl)Li(THF)3 (2) in 48% yield and a neutral [CyC(N-2,6-Me2C6H3)2]Nd(CH2SiMe3)2(THF)2 (5) in 52% yield, respectively. They were characterized by elemental analysis, FT-IR, NMR spectroscopy (except for 2 and 5 for their strong paramagnetic property). Complexes 2, 3, 4 and 5 were subjected to X-ray single crystal structure determination. These neutral mono(amidinate) rare earth metal bis(alkyl) complexes showed activity towards l-lactide polymerization to give high molecular weight and narrow molecular weight distribution polymers. 相似文献