Results 1 - 10 of 150
Results 1 - 10 of 150. Search took: 0.019 seconds
|Sort by: date | relevance|
[en] A fiber optic conveyor has been developed for investigating the travel-time difference between two counter-propagating light beams in uniformly moving fiber. Our finding is that there is a travel-time difference Δt=2vΔl/c2 in a fiber segment of length Δl moving with the source and detector at a speed v, whether the segment is moving uniformly or circularly
[en] The effect of a transverse single-particle current (Ix) on the charge-density wave (CDW) dynamics in the blue bronze K0.3MoO3 was reported. We found that the modulation of I-V characteristics are asymmetric to the polarity of the transverse current, possibly due to an additional longitudinal electric field (Eadd) caused by the slight unbalance of the two transverse current probes. Our result seems inconsistent in some ways with the recent study by Artemenko et al
[en] The wave of NEMP propagation through ionosphere into space are calculated by means of the radial-trace method. With the expression and delays of the ionosphere, NEMP wave turned into a vibrating wave. Numerical simulations show that NEMP can be measured at the orbit of satellite. (authors)
[en] The single phase and polycrystalline MgB2 superconductor was synthesized by the Mg diffusion method and its temperature dependence of resistivity was studied from Tc up to 460 K. The normal state temperature dependence of electrical resistivity is linear above 270 K and can be fitted well by the Bloch-Gruneisen expression with the Debye temperature θD=1200 K for the temperature range from 40 to 450 K. There is an unexpected abrupt jump in ρ(T) curve near 450 K. Thermal-gravity and differential thermal-analysis (TG-DTA) indicated this jump of ρ(T) could be caused by the oxidation of few Mg impurities in air atmosphere
[en] We have studied how local anesthetics influence the structural and dynamical properties of model bio-membranes. The measurements of small-angle neutron scattering have been performed on 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) unilamellar vesicles with different concentrations of lidocaine in D2O to determine the bilayer thickness as a function of the lidocaine concentration. The neutron-spin echo spectroscopy (NSE) has been used to study the influence of lidocaine on the bending elasticity of DMPC bilayers in fluid crystal phase (Lα) and the ripple gel (Pβ') phase.
[en] The new algorithm for the solution of dynamic elastic-plastic problems is derived based on the Parametric Variational Principle. The gradient dependent model is employed in the numerical model to overcome the mesh-sensitivity difficulty in dynamic strain softening or strain localization analysis. The precise integration method, which has been used for the solution of linear problems, is adopted and improved for the solution of dynamic nonlinear equations. The new algorithm is proposed by taking the advantages of the Parametric Quadratic Programming method and the Precise Integration method. Results of numerical examples demonstrate the validity and the advantages of the proposed algorithm
[en] The irradiance on the earth synchronous orbit and median orbit in the standard atmosphere was computed. The dynamic range and the sensitivity of the detector were drawn, and the feasibility was analyzed also. Detection of the irradiance and the power would not be effected when the detector on the ISGO or similar GPS constellation. (authors)
[en] On the basis of introducing the methods of calculating the distance between atmospheric explosion shooting point and infrasound station, the paper summarizes the analysis results of domestic and international atmospheric explosion infrasonic data, and gives several methods for evaluating atmospheric explosion yield using infrasonic signals. (authors)
[en] Graphical abstract: Interstitial carbon in WO_3·0.33H_2O matrix enhanced the photocatalytic activity under visible light. - Highlights: • Carbon-doped tungsten trioxide has been synthesized via a mild liquid phase method. • The existence and position of carbon are discussed by some detailed characterization. • Carbon doping improved the photocatalytic activity. • Carbon doping induces defects and reduces the recombination of photo-generated carriers. - Abstract: A carbon doping method is developed to overcome the drawback of conventional carbon doping method. The carbon dopant is synthesized by treating carbon with dilute nitric acid through hydrothermal process. Carbon-doped WO_3·0.33H_2O (C−WO_3·0.33H_2O) is obtained by adding the carbon dopant solution, and then through an additional hydrothermal process. Based on XRD, Raman and XPS, carbon have been incorporated into the interstitial position of WO_3·0.33H_2O unit cell rather than substitution of oxygen in lattice of WO_3·0.33H_2O, which induces distortion of WO_6 octahedron and lattice defect. In addition, carbon doping also induces the emergence of new level above the valence band. The new level increases the migration pathway of photo-generated carriers, which reduces the recombination rate of photo-generated carriers. The changes of band structure, distortion of WO_6 octahedron and lattice defect are beneficial to improve the photocatalytic performance of WO_3·0.33H_2O. Compared with pristine WO_3·0.33H_2O, C−WO_3·0.33H_2O display better photocatalytic performance on degradation of rhodamine B (RhB), which include the faster de-ethylation process and cycloreversion process. Moreover, the experiments of radical quenchers confirmed that the h"+ display the main influence on degradation of RhB. This study implies that carbon can be doped into some metal oxide hydrates through a mild preparation process, which provides a possible way for the synthesis of carbon doped thermal unstable materials.