[en] Let ([0,1),T) be the dynamical system of continued fraction expansions with T the Gauss map. For any irrational point y∈[0,1), let I_n(y) be the cylinder of order n containing y. For any x∈[0,1), define the maximal hitting depth of x to the irrational point y as R_n(x,y)≔max{t∈N₀:Tⁱ(x)∈I_t(y)for some0⩽i< n}. In this note, we investigate the asymptotic behaviors of R_n(x,y) with respect to the Gauss measure as well as Hausdorff dimensions of exceptional sets related to the asymptotic properties of R_n(x,y)

[en] The microstructure performance for vacuum brazing interface of Al/18-8 stainless steel was studied by means of SEM, micro-hardness test and X-ray diffraction (XRD). The test results indicate that the adhesion brazing interface is excellent, there is no porosity or crack near the interface. The microstructure of the brazing joint is mainly composed of equiaxial and column crystal. The fracture morphology of the brazing joint consists mainly of a coarse and gray fiber-shape fracture, and the fracture is mainly the mixed fracture of toughness and cleavage. The brazing interface consists of δ (Al, Fe, Si) and α-Al (Si), without obvious brittleness phase of the high hardness

[en] Human performance while executing operating procedures is critically important for the safety of complex industrial systems. To predict and model human performance, several complexity measures have been developed. This study aims to compare the convergent validity and predictive validity of three existing complexity measures, step complexity (SC), task size, and task complexity (TC), using operator performance data collected from an emergency operating procedure (EOP) experiment. This comparative study shows that these measures have a high convergent validity with each other, most likely because all of them involve the size dimension of complexity. These measures and their sub-measures also have a high predictive validity for operation time and a moderate-to-high predictive validity for error rate, except the step logic complexity (SLC) measure, a component of the SC measure. SLC appears not to contribute to the predictive validity in the experimental EOPs. The use of visual, auditory, cognitive, and psychomotor (VACP) rating scales in the TC measure seems to be significantly beneficial for explaining the human error rate; however, these rating scales appear not to adequately reflect the complexity differences among the meta-operations in EOPs

No abstract available

[en] The homogeneity of IAEA RM SM-M-2/TM Marine Sediment was tested by INAA. The sampling constants a and b have been determined for 6 elements. (author) 10 refs.; 4 figs.; 3 tabs

[en] In the training of the nuclear power plant operators, the Distributed control system (DCS) simulator is required to have the data replay function, so that the trainer could monitor the operator's operation. This function is the main difference between the simulator and the actual DCS system, as well as the main difficulty to implement the simulator. This paper fully discussed the design and implementation of the data replay function, and the data replay function is realized through storing and querying the system data, events, mouse and keyboard operation in the system. This technology has been realized in SpeedySim, which is the DCS simulator product for the nuclear power plants, and it has been applied in the full scope simulator system in unit 5 and 6 in Yangjiang Nuclear Power Station. This technology can be promoted for the application of other simulator products and systems. (authors)

[en] Graphical abstract: Carbon and nitrogen codoped TiO₂ nanoparticles were firstly fabricated by calcining TiN powder under CO atmosphere at different temperatures between 400 and 600 °C, both the improved photocatalytic activity for degradation of methylene blue and enhanced photovoltaic performance for dye sensitized solar cells were demonstrated. - Highlights: • CN-codoped TiO₂ nanoparticles were prepared by calcining TiN under CO atmosphere. • More visible light response was confirmed by UV–vis DRS and photocatalytic results. • Enhanced conversion efficiency was observed for the DSSCs from CN-TiO₂ photoanode. • CN-codoping played an important role to improve the photocatalytic performance. - Abstract: Carbon and nitrogen codoped titania (CN-TiO₂) nanoparticles were fabricated by calcining titanium nitride (TiN) nanoparticles under carbon monoxide (CO) atmosphere at four different temperatures in a range of 400–600 °C. The as-prepared samples were characterized with X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS). Enhanced light absorption in both the UV and visible light region was observed for the resulted CN-TiO₂ nanoparticles in ultraviolet-visible diffuse reflectance spectroscopy (UV–vis DRS). Improved photocatalytic activity toward the degradation of methylene blue by the CN-TiO₂ nanoparticles was demonstrated under UV and visible light, respectively. The highest degradation rate was achieved for CN-TiO₂ nanoparticles (13%) compared to N-TiO₂ (10%) and the commercial P25 (5%) under visible light illumination for 40 min. Furthermore, the improved photocatalytic activity of CN-TiO₂ was also confirmed by the degradation of colorless resorcinol under UV–vis light irradiation. Dye-sensitized solar cells (DSSCs) were fabricated using P25, N-TiO₂ and CN-TiO₂ photoanodes, respectively. The highest conversion efficiency of 3.31% was achieved by the DSSCs based on the CN-TiO₂ photoanodes in comparison with the commercial P25 (1.61%) and N-TiO₂ (2.44%) photoanodes. This work demonstrates that thermal treatment of TiN nanoparticles under CO atmosphere has shown to be a rapid, direct and clean approach to synthesize photocatalysts with enhanced photocatalytic and photovoltaic performance

[en] Aiming at the characters of detecting gamma-ray for verifying and analyzing nuclear materials, an relative transform coefficient method is set up for nuclear materials analysis. Through the method, the authors can obtain information of nuclear materials. Two experiments have been given to prove the correctness and feasibility of the method. (authors)

[en] Sample preparation, characterization, crystallization and preliminary X-ray analysis are reported for a HNF1β–DNA binary complex

[en] With the DCS of nuclear plant localization process further, requiring the DCS of nuclear plant has better properties. The database is the core part of DCS in LEVEL2. This article describes the database software in the nuclear dedicated instrumentation and control system belonging to CTEC. It has better performance and usability. This article includes the following aspects: (l) The database contains the data dictionary and index table. Database can high-speed read and write through data dictionary. (2) Through point subscribe and caching mechanism, you can speed read data from the database software cycle. (3) Through mapping by point's item, make sure the high speed of the nuclear power plant data acquisition. (4) Users can self-define database point's type and point's item attributes, so the database has very good scalability. (5) The data trigger event is scalable. Finally, this article describes the database software in the practical application of Hongyanhe and Li-ao nuclear power station's KDO/KME system. This article has a very important practical significance for the research and development of domestic database software in the nuclear dedicated instrumentation and control system. (authors)