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We report the first observation of a stick-slip transition of surfactant solution flow through nanopores. From the experimental data, we were able to determine both the slip length and the critical wall shear stress from which slip occurs. Whereas the latter is found to increase linearly with the concentration, the former remains constant and approximately equal to 20 nm over the studied range of concentrations. We model slip to occur in the surfactant bilayer adsorbed at the nanopore wall. The stick-slip transition is then related to a reorganization of the surfactant bilayer from an entangled structure into independent layers flowing past one another, as evidenced by independent surface plasmon resonance experiments. We conclude from our analysis that surfactant solutions are always slipping in larger tubes. However, the larger the tube diameter, the smaller the relative slip contribution to the total flow. 相似文献
43.
Mihály Geréb-Graus 《Discrete Mathematics》1983,46(3):241-248
Main result: Let ? be a collection of divisors of N = pe11?penn (e1 = minei for all i? {1,…, n}) such that if any two numbers in ? are coprime then their common multiple is N and maximal with respect to this condition, i.e. there is no other collection satisfying this condition which properly contains ?. We prove that ? consists of at least elements. 相似文献
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47.
Murat Gerçeklioğlu 《Czechoslovak Journal of Physics》2002,52(5):705-712
The microscopic structure of the 0+ excitations of the156,158,160,162,164,166Dy isotopes has been studied using the Pairing Plus Quadrupole (PPQ) model in the framework of the Random Phase Approximation
(RPA). To determine the nature and general trends of the properties of these states depending on the neutron number, their
energies, theB(E2) andρ
2(E0) transition values and two-nucleon transfer strengths have been calculated. In addition, the relative summed strengths ofL=0 transitions in the (t,p) and (p,t) reactions have been calculated and compared with experiment. 相似文献
48.
Within the framework of quasi-particle random phase approximation, the isospin breaking correction of superallowed 0+ → 0+ beta decay and unitarity of Cabibbo-Kobayashi-Maskawa mixing matrix have been investigated. The broken isotopic symmetry of nuclear part of Hamiltonian has been restored by Pyatov’s method. The isospin symmetry breaking correction with pairing correlations has been compared with the previous results without pairing. The effect of pairing interactions has been examined for nine superallowed Fermi beta decays; their parent nuclei are 26Al, 34Cl, 38K, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb. 相似文献
49.
Yen-Chung Chen Robert Lian-Huey Liu Xin-Liang ChenHsiou-Jeng Shu Ming-Der Ger 《Applied Surface Science》2011,257(15):6734-6740
A novel microwave-assisted activation method for electroless plating on PMMA microspheres is presented in this study. When the microwave irradiation was applied during the activation step, the amount of the Pd species adsorbed on PMMA surfaces was much higher than that of sample pretreated with a conventional activation process without microwave irradiation. With this activation method, it was also shown that the adsorbed Pd species with a size of 4-6 nm were uniformly distributed on the surfaces of the PMMA microspheres, thus a smooth and uniform nickel-phosphorus coating on the PMMA microspheres was obtained by subsequent electroless plating. The samples after each step were characterized by XPS, TEM, ICP and SEM. 相似文献
50.
Dr. Seung‐Goo Lee Prof. Young‐Ger Suh Prof. Jeeyeon Lee 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(9):2508-2514
Elucidation of the signal‐transmission pathways between distant sites within proteins is of great importance in medical and bioengineering sciences. The use of optical methods to redesign protein functions is emerging as a general approach for the control of biological systems with high spatiotemporal precision. Here we report the detailed thermodynamic and kinetic characterization of novel chimeric light‐regulated Tet repressor (TetR) switches in which light modulates the TetR function. Light absorbed by flavin mononucleotide (FMN) generates a signal that is transmitted to As‐LOV and YtvA‐LOV fused TetR proteins (LOV=light–oxygen–voltage), in which it alters the binding to tetracycline, the TetR ligand. The engineering of light‐sensing protein modules with TetR is a valuable tool that deepens our understanding of the mechanism of signal transmission within proteins. In addition, the light‐regulated changes of drug binding that we describe here suggest that engineered light‐sensitive proteins may be used for the development of novel therapeutic strategies. 相似文献