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51.
ASYMPTOTIC BEHAVIOR FOR GENERALIZED GINZBURG-LANDAU POPULATION EQUATION WITH STOCHASTIC PERTURBATION 下载免费PDF全文
In this paper, we are devoted to the asymptotic behavior for a nonlinear parabolic type equation of higher order with additive white noise. We focus on the Ginzburg-Landau population equation perturbed with additive noise. Firstly, we show that the stochastic Ginzburg-Landau equation with additive noise can be recast as a random dynamical
system. And then, it is proved that under some growth conditions on the nonlinear term, this stochastic equation has a compact random attractor, which has a finite Hausdorff dimension. 相似文献
52.
The relative intrinsic and extrinsic fluorescence of hemoglobins are established markers of the R (oxy) T (deoxy) transition and reveal site-specific conformational differences amongst hemoglobin (Hb) mutants. The Hb central cavity has been probed by binding the fluorescent analogue of 2,3-diphosphoglycerate, 8-hydroxy-1,3,6-pyrenetrisulfonate (HPT). An approach to quantify binding of HPT to HbC (6 Lys) and HbA (6 Glu), by steady-state front-face fluorescence spectroscopy using both the intrinsic and extrinsic emissions, is presented. When HPT specifically binds to Hb, efficient fluorescence energy transfer from the intrinsic fluorescence of Hb to HPT occurs, decreasing the intrinsic fluorescence of Hb that plateaus upon stoichiometric binding. HPT fluorescence is significantly but not totally quenched upon binding to HbA and HbC. HPT exhibits a molecular binding ratio of 2:1 to HbC, in contrast to HbA (1:1 binding). The apparent secondary binding site for HbC is weaker (KD1 = 25 M vs. KD2 = 0.15 mM). Conformational alterations of HbC at the and clefts of the central cavity are further supported by these data. 相似文献
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Chiral Carbonaceous Nanotubes Modified with Titania Nanocrystals: Plasmon‐Free and Recyclable SERS Sensitivity 下载免费PDF全文
Dr. Bocheng Qiu Dr. Mingyang Xing Qiuying Yi Prof. Dr. Jinlong Zhang 《Angewandte Chemie (International ed. in English)》2015,54(36):10643-10647
Chiral carbonaceous nanotubes (CNT) were successfully used in plasmon‐free surface‐enhanced Raman scattering (SERS) for the first time. Further modification of TiO2 nanocrystals on the chiral CNTs successfully realized the recycling of SERS substrate as chiral CNT/TiO2 hybrids. The high SERS sensitivity of methylene blue (MB) over the chiral CNT/TiO2 hybrids is ascribed to the laser‐driven birefringence induced by the helical structure, which provides much more opportunities for the occurrence of Raman scattering. The TiO2 nanocrystals highly dispersed on the surface and inside the hollow cavity of chiral CNTs can completely degrade the MB under the solar light irradiation, leading to the self‐cleaning of SERS substrate. The present research opens a new way for the application of chiral inorganic materials in plasmon‐free SERS detection. 相似文献
56.
Shourui Li Shouchao Liu Zhiwei Fu Qiuying Li Chifei Wu Weihong Guo 《Surface and interface analysis : SIA》2017,49(3):197-204
Carbon black (CB) was encapsulated by the sodium lignosulphonate via the strong π–π* interaction force of aromatic ring in the planetary ball milling instrument. The use of new surfactant and ball milling instrument met the requirements about the low‐cost standard and provided an important sense to industrialization in comparison with the old surfactant, the poly(sodium 4‐styrenesulfonate). The successful encapsulation was confirmed by Raman spectroscopy, X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and thermal gravimetric analysis. Encapsulation ratio of the modified CB increased to 15.9% when CB was prepared at longer milling time and with agate balls in different size. The morphology and dispersibility of samples studied by transmission electron microscope, sedimentation experiment and ultraviolet–visible spectroscopy showed that the modified CB dispersed stably in the deionized water. The average diameter and absolute value of zeta potential of the modified CB decreased and increased compared with those of CB, respectively, which confirmed further that sodium lignosulphonate encapsulated on the surface of CB make CB disperse better. In addition, the average diameter and zeta potential of the samples were affected by ball milling conditions. The modified CB prepared at longer milling time and with different sizes of agate balls had better dispersibility than the ones prepared at shorter milling time and with same size of agate balls. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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A series of simple and new C2-symmetric diphenylmethylidene malonate-type bis(oxazoline) ligands were synthesized and applied to the Friedel-Crafts reaction and allylic alkylation. The Cu(II) complex of ligand 4b bearing the benzyl group afforded good to excellent enantioselectivity for the F-C adducts (up to >99% ee) between indole and alkylidene malonate, and the palladium complex of ligand 4c bearing the phenyl group afforded excellent enantioselectivity (up to 94% ee) for the allylic alkylation product. 相似文献
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The application of nanoparticles in the biomedical field is an exciting interdisciplinary research area in current materials science. In the present study, size-tunable and water-soluble noble metal silver nanoparticles (Ag NPs) have been successfully synthesized with the assistance of glutathione (GSH). The as-synthesized Ag NPs are ready to bind covalently with a model protein (bovine serum albumin) in mild conditions. The optical property of surface-modifiable Ag NPs was extremely sensitive to their size and the surface modification, suggesting a potential in the biomedical analysis and detection. Furthermore, Ag NPs with an average diameter of ca. 6 nm effectively suppress the proliferation of human leukemic K562 cells in the dose- and time-dependent manners, suggesting the promising potential of Ag NPs in cancer therapy. 相似文献
59.
Wang Zhaojie Shang Yizhu Chen Hongyu Cao Shoufu Zhu Qiuying Liu Siyuan Wei Shuxian Lu Xiaoqing 《Journal of Solid State Electrochemistry》2023,27(5):1279-1287
Journal of Solid State Electrochemistry - Electrocatalytic carbon dioxide reduction reaction (CO2RR) is a promising method to deal with the greenhouse effect and the energy crisis. In a... 相似文献
60.
研制了一种厚度模空耦式压电换能器,使用综合考虑材料衰减系数和声阻抗的空耦式压电换能器电力声等效电路理论模型以指导匹配层结构设计和材料选择,选用新型的空心聚合物微珠/环氧树脂复合材料作为声匹配材料,优化设计电阻抗匹配及结构参数。该换能器中心频率为510 kHz,-6 dB频域相对带宽为25.4%,插入损耗为-27 dB。结果表明,使用新型低衰减系数的闭孔复合材料单匹配层设计的该换能器不仅保证了高灵敏度,同时简化了换能器结构,为空耦式压电换能器研制提供了新思路。 相似文献