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排序方式: 共有181条查询结果,搜索用时 15 毫秒
31.
In this paper, we prove the nonlinear orbital stability of the stationary traveling wave of the one-dimensional Gross–Pitaevskii equation by using Zakharov–Shabat's inverse scattering method. 相似文献
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Wei Wang Pingwen Zhang Zhifei Zhang 《Archive for Rational Mechanics and Analysis》2012,206(3):953-995
The dynamics of a membrane are that of a coupled system comprising a moving elastic surface and an incompressible membrane fluid. We will consider a reduced elastic surface model, which involves the evolution equations of the moving surface, the dynamic equations of the two-dimensional fluid, and the incompressible equation, all of which operate within a curved geometry. In this paper, we prove the local existence and uniqueness of the solution to the reduced elastic surface model by reformulating the model into a new system in the isothermal coordinates. One major difficulty is that of constructing an appropriate iterative scheme such that the limit system is consistent with the original system. 相似文献
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采用可逆加成断裂链转移(RAFT)聚合制备了具有硫醇端基的聚甲基丙烯酸叔丁酯(PtBMA),通过其水解得到具有pH刺激响应的聚甲基丙烯酸(PMAA)。利用硫醇端基与金之间的强耦合作用获得了聚甲基丙烯酸单层修饰的金纳米粒子(PMAA-GNPs)催化体系。利用UV-Vis光谱和透射电子显微镜(TEM)研究了PMAA-GNPs催化剂在不同pH值下的分散状态。以NaBH4还原对硝基苯酚的反应,验证了此催化体系的pH响应性。结果表明,调节体系的pH值为酸性,PMAA塌缩和包覆在金纳米粒子(GNPs)的表面,引起GNPs的聚集,从而降低了催化效率。反之,在碱性环境中,在PMAA链的排斥作用下,GNPs能较好的分散,提高催化效率。 相似文献
34.
The fullerendiol C60(OH)2(OOt-Bu)4 1 reacts with various arylboronic acids ArB(OH)2 to form fullerene-containing boronic esters C60(O2BAr)(OOt-Bu)4 in up to 95% yield depending on the structure of aryl group. Bis(pinacolato)diboron (B(OCMe2)2)2 also reacts with 1 to form C60(O2BB(OCMe2)2)(OOt-Bu)4. The bisboronic ester C60(O)(O2BAr)2(OOt-Bu)2 was also obtained starting from a tetrahydroxyl fullerene derivative C60(O)(OH)4(OOt-Bu)2. The fullerenyl boronic esters are moderately stable in air. Single crystal X-ray structure of C60(O2BPh)(OOt-Bu)4 was obtained. 相似文献
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Leqing Lin Yu Zhong Haoyang Lin Chenglong Wang Zhifei Yang Qian Wu Di Zhang Wenguo Zhu Yongchun Zhong Yuwei Pan Jianhui Yu Huadan Zheng 《Molecules (Basel, Switzerland)》2022,27(13)
Spider silk is one of the hottest biomaterials researched currently, due to its excellent mechanical properties. This work reports a novel humidity sensing platform based on a spider silk-modified quartz tuning fork (SSM-QTF). Since spider silk is a kind of natural moisture-sensitive material, it does not demand additional sensitization. Quartz-enhanced conductance spectroscopy (QECS) was combined with the SSM-QTF to access humidity sensing sensitively. The results indicate that the resonance frequency of the SSM-QTF decreased monotonously with the ambient humidity. The detection sensitivity of the proposed SSM-QTF sensor was 12.7 ppm at 1 min. The SSM-QTF sensor showed good linearity of ~0.99. Using this sensor, we successfully measured the humidity of disposable medical masks for different periods of wearing time. The results showed that even a 20 min wearing time can lead to a >70% humidity in the mask enclosed space. It is suggested that a disposable medical mask should be changed <2 h. 相似文献
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The 2017 Nobel Prize in chemistry was awarded to Jacques Dubochet, Joachim Frank and Richard Henderson for their contribution to developing the cryo-electron microscopy (cryo-EM) method for high-resolution structure determination of biomolecules in solution. In recent years, cryo-EM is leading a revolution in structural biology, and becoming a major tool in studying the structure and function of biomolecular machines. Here, we briefly describe the method development of cryo-EM and the personal contributions of the three Nobel Laureates. 相似文献
40.
Novel capsules with high stability and controlled permeability by hierarchic templating 总被引:5,自引:0,他引:5
Dai Z Dähne L Möhwald H Tiersch B 《Angewandte Chemie (International ed. in English)》2002,41(21):4019-4022