[en] This paper presents a novel pixel-level resolution 3D profilometry technique that only needs binary phase-shifted structured patterns. This technique uses four sets of three phase-shifted binary patterns to achieve the phase error of less than 0.2%, and only requires two sets to reach similar quality if the projector is slightly defocused. Theoretical analysis, simulations, and experiments will be presented to verify the performance of the proposed technique.

[en] For a three-dimensional shape measurement system with a single projector and multiple cameras, registering patches from different cameras is crucial. Registration usually involves a complicated and time-consuming procedure. We propose a new method that can robustly match different patches via absolute phase without significantly increasing its cost. For y and z coordinates, the transformations from one camera to the other are approximated as third-order polynomial functions of the absolute phase. The x coordinates involve only translations and scalings. These functions are calibrated and only need to be determined once. Experiments demonstrated that the alignment error is within RMS 0.7 mm

[en] We propose a new three-step phase-shifting algorithm, which is much faster than the traditional three-step algorithm. We achieve the speed advantage by using a simple intensity ratio function to replace the arc tangent function in the traditional algorithm. The phase error caused by this new algorithm is compensated for by use of a lookup table. Our experimental result sshow that both the new algorithm and the traditional algorithm generate similar results, but the new algorithm is 3.4 times faster. By implementing this new algorithm in a high-resolution, real-time three-dimensional shape measurement system,we were able to achieve a measurement speed of 40 frames per second ata resolution of 532x500 pixels, all with an ordinary personal computer

[en] A structured light system using a digital video projector is widely used for 3D shape measurement. However, the nonlinear γ of the projector causes the projected fringe patterns to be nonsinusoidal, which results in phase error and therefore measurement error. It has been shown that, by using a small look-up table (LUT), this type of phase error can be reduced significantly for a three-step phase-shifting algorithm. We prove that this algorithm is generic for any phase-shifting algorithm. Moreover, we propose a new LUT generation method by analyzing the captured fringe image of a flat board directly. Experiments show that this error compensation algorithm can reduce the phase error to at least 13 times smaller

[en] The highly ordered mesoporous niobium oxides fabricated by self-adjusted synthesis have been used as immobilization matrices of heme proteins including Cytochrome c (Cyt C) and horseradish peroxidase (HRP) for their large surface areas, narrow pore size distributions and good biocompatibility. The assembling process was investigated by cyclic voltammetry, amperometry and potential step chronoamperometry in details. Niobium oxide matrices with different structural features were templated with the surfactants and the selectivity of these hosts to specific protein characteristics was determined. It was observed that proteins could be readily assembled onto the mesoporous films with detectable retention of bioactivity. The Nb₂O₅ matrix with a tailored pore size and counterpoised surface charge to that of hemes allowed for a maximum adsorption capacity of biomolecules. The adsorbed redox molecules exhibited direct electrochemical behavior and gave a pair of well-defined quasi-reversible cyclic voltammetric peaks, indicating that the mesoporous niobium oxide matrix could effectively promote the direct electron transfer between the protein redox site adsorbed and the electrode surface. The midpoint redox potentials of adsorbed Cyt-c and HRP were 14 and -122 mV versus SCE, respectively. Furthermore, the immobilized HRP onto Nb₂O₅ derived electrode presented good bioactivity and thus was fabricated as an amperometric biosensor for the response of hydrogen peroxide in the range from 0.1 μM to 0.1 mM

[en] The operators are important safety barrier of nuclear power plant. Simulator training is one of the most important phase of the operator training. As a 3rd generation passive nuclear power plant, AP1000 operator simulator training according to American standard operator simulator training method which is different from which of traditional China nuclear power plant. AP1000 simulator training characteristics are analyzed on content, implementation and exam result for domestic plant simulator training as a reference. (authors)

[en] The process and phenomena of the severe accident is described in this paper, and the severe accident management is analyzed. The WOG SAMG is systemically introduced, as well as its structure: the guidelines of MCR, the guidelines of TSC, CAs, and SAEGs. The logic of the accident management strategies of WOG SAMG is summarized and some suggestions for the research of accident management in China are provided. (authors)

[en] Sandwich-type MgB_2/Boron/MgB_2 Josephson junctions were fabricated using magnetron sputtering system. The rapid-anneal process was adopted to replace traditional way of annealing, trying to solve the problem of interdiffusion and oxidation with multilayer films. The boron film was used as barrier layer to avoid the introduction of impurities and improve reproducibility of the junctions. The bottom MgB_2 thin films deposited on c-plane sapphire substrate exhibits a critical temperature T_C of 37.5 K and critical current density J_C at 5 K of 8.7 × 10"6 A cm"−"2. From the XRD pattern, the bottom MgB_2 thin film shows c-axis orientation, whereas the top MgB_2 became polycrystalline as Boron barrier layer grown thicker. Therefore, all junction samples show lower T_C than single MgB_2 thin film. The junctions exhibit excellent quasiparticle characteristics with ideal dependence on temperature and Boron barrier thickness. Subharmonic gap structure was appeared in conductance characteristics, which was attributed to the multiple Andreev reflections (MAR). The result demonstrates great promise of this new fabrication technology for MgB_2 Josephson junction fabrication. - Highlights: • Sandwich-type MgB_2/Boron/MgB_2 Josephson junctions were fabricated. • The junctions were annealed after deposition with the rapid-anneal process. • The highest critical current is 25.3 mA at 5 K and remains non-zero near 25 K. • Subharmonic gap features can be observed in the dI/dV – V curves

[en] Severe Accident Management Guideline is used during the beyond design basic accident to mitigate the results and limit the fission products release. The phenomena of severe accident, the structure and usage of SAMGs and the process of decision making are introduced in this paper based on the SAMGs of Sanmen Nuclear Power Plant. (authors)

[en] AgCu alloy nanowires were prepared by a solid-state ionics method under a direct current electric field (DCEF) using fast ionic conductor RbAg₄I₅ films and Rb₄Cu₁₆Cl₁₃I₇ films. The surface morphology and chemical composition of the AgCu alloy nanowires were characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. Raman enhancement performance of the AgCu alloy nanowires substrates was detected by Rhodamine 6G (R6G) aqueous solutions as probe molecules. Long-range order and short-range order AgCu alloy nanowires with the length of 1 cm were prepared by a solid-state ionics method. The nanowires were bamboo-shaped and the diameters of nanowires ranged from 30 to 130 nm, many regularly arranged nanoparticles with the diameter of 15 nm lie in the prepared nanowires. The molar ratio of Ag to Cu is 15:1. The limiting concentrations of R6G for the prepared AgCu alloy nanowires SERS substrates is 10⁻¹⁴ mol/L. - Highlights: • Centimeter level AgCu alloy nanowires were prepared by a solid-state ionics method. • The molar ratio of Ag to Cu is 15:1 for the prepared AgCu alloy nanowires. • The nanowires are bamboo-shaped and the diameters range from 30 to 130 nm. • The limiting concentrations of R6G for the prepared alloy nanowires is 10⁻¹⁴ mol/L.