Subjects: Nursing >> Nursing submitted time 2023-05-12
Abstract： Objective To develop the core competency index system for stomatological nurse specialist. Methods? Based on literature review,the core competency index system was developed by two rounds of Delphi method. Results? The expert questionnaire enthusiasm coefficient was all 100%, and the average authority coefficient was 0.891, variation coefficient was lower than 0.25. The core competency index system eventually included 4 first-level indexes which were clinical practice ability, nurse consulting ability, research ability, management ability, and 22 secondary indexes. Conclusion The core competency index system for stomatological nurse specialist is scientific, reasonable and credible. It provides objective basis for comprehensive specialized development of nurses" ability.
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Subjects: Library Science，Information Science >> Information Science submitted time 2017-11-05 Cooperative journals: 《智库理论与实践》
Abstract： [Purpose/significance] The paper discusses the government decision-making information demand from the angle of the information user theory and then puts forward the new strategy for think tanks’ operating mechanism. [Method/process] Employing the method of literature research, the paper analyzed the inner drive , the characteristics，the structure and types of the government decision-making information demand, and then put forward the countermeasures and suggestions of think tanks’ operating mechanism. [Result/conclusion] The paper makes suggestions for the construction of a new think tank mechanism in terms of information resources, the quality monitoring system, the communication mechanism based on the general flow of the analysis about government decision-making information demands, which aims at providing a new prospective and theoretical basis for the new think tank construction
Subjects: Library Science，Information Science >> Information Science submitted time 2017-07-13 Cooperative journals: 《智库理论与实践》
Abstract：[目的 /意义]从信息用户理论出发,研究政府决策信息需求,提出新型智库运行机制策略。[方法 /过程]利用文献调研的方法,从内在驱动、特点、结构和类型入手,分析政府决策信息需求,提出智库运行机制建议。[结果 /结论 ]按照政府决策信息需求流程,从信息资源、选题机制、质量监控体系、沟通机制4个方面提出新型智库机制建设的相关建议,旨在为新型智库建设提供新的角度和理论依据。
Subjects: Astronomy >> Astrophysical processes submitted time 2023-12-06 Cooperative journals: 《天文研究与技术》
Abstract： We conducted a test using the popular science telescope, Sky-Watcher 150PDS, and the amateur-grade ZWO ASI120MM-S CMOS camera to explore the feasibility of using popular science equipment for professional astronomical observation and scientific research. Initially, we evaluated the basic performance and parameter curves of the CMOS camera, which met the fundamental requirements for professional astronomical observation. Subsequently, we installed the CMOS camera on the Sky-Watcher telescope and performed basic astronomical observations at the Xinglong Observatory, NAOC. We observed the open cluster M35 and the short-period variable star V∗V2455 Cyg, while acquiring the necessary photometric auxiliary images (bias and flat). The acquired data underwent professional astronomical image processing techniques, including astrometric calibration, aperture photometry, and flux calibration. This allowed us to obtain the photometric data, light curve, and performed a simple period analysis for the observed targets. By comparing our photometric results with known star catalogs, we determined that the photometric precision of our system exceeded 0.02 mag, with a differential photometric precision of approximately 0.005 mag. These results demonstrate the capability of popular science telescopes and CMOS cameras for conducting astronomical observations and research. Consequently, this opens opportunities for primary and secondary school students as well as astronomy enthusiasts to actively participate in astronomical scientific observation and research.
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-07-01
Abstract： Background : The quantification of uncertainty has become a common requirement in reactor physics analysis, with the covariance data of nuclear data serving as the foundational data for conducting uncertainty quantification. Purpose : This study aims to develop a covariance data generation module, covar_calc, in the nuclear data processing software NECP-Atlas to produce continuous energy covariance data for Monte Carlo programs and multi-group covariance data for deterministic programs. Methods : Covar_calc module was developed to process all covariance data provided in evaluated nuclear databases, according to the different storage formats of nuclear data and different computational methods. This included the covariance data of various parameters such as average fission neutron multiplicities, cross sections, angular distributions of secondary particles, fission spectrum, resonance parameters, and neutron activation cross-sections. Results : A comparative verification is carried out with the covariance data production module in the nuclear data processing software NJOY21 to demonstrate the accuracy of the multi-group covariance databases produced by NECP-Atlas and the maximum bias is less than 0.1%. Utilizing Monte Carlo calculation code NECP-MCX and uncertainty analysis code NECP-UNICORN, sensitivity coefficients for different benchmarks are calculated. By incorporating both continuous energy covariance databases and multi-group covariance data, and utilizing the Sandwich formula, the final uncertainties are computed. The results indicate that the uncertainties calculated using the multi-group covariance data generated by NECP-Atlas exhibit comparable accuracy to those obtained with NJOY21. Conclusions : The precision in creating both continuous energy covariance and multi-group covariance meets the requirements for usage in Monte Carlo programs and deterministic programs, validating the efficacy of covar_calc module within NECP-Atlas for uncertainty quantification in reactor physics analysis.
Subjects: Nuclear Science and Technology >> Engineering of Nuclear Power submitted time 2024-06-23
Abstract： Background Pebble Bed High Temperature Gas-cooled Reactor (PB-HTGR) is very different from other type of reactor in terms of its geometric structure, neutron characteristics, and mode of operation. Thus, it is imperative to develop a specialized analysis and calculation code for the PB-HTGR. Purpose In order to further improve the precision of core physics calculation of the PB-HTGR, the Nuclear Engineering Computational Physics (NECP) Laboratory of Xi ’an Jiaotong University has independently developed the neutronics calculation module of the neutronics and thermal hydraulic calculation program called NECP-Panda, which is suitable for PB-HTGR. Method In the neutronics calculation, NECP-Panda adopted the two-step method. The first step is to calculate the component homogenized group constants based on Monte Carlo method. In the second step, the homogenization of the pebble bed was performed using collision probability equations, and the whole-core diffusion calculation was subsequently completed using the three-dimensional cylindrical geometric Nodal Expansion Method (NEM). In order to accurately account for the influence of neutron leakage effect on the group constants of the model region, the diffusion calculation and neutron leakage correction were iterated until the group constants of the region converged. In addition, the neutron streaming effect of the porous structures had been corrected in the iteration, and the cavity at the top of pebble bed had been treated specially in the diffusion calculation. Results NECP-Panda had been verified by two models, one is the simplified mixed pebble bed reactor, while the other is the High Temperature Reactor Pebble-bed Module (HTR-PM). The numerical results show that the eigenvalue calculation of the simplified mixed pebble bed reactor, calculated by NECP-Panda, is close to the Monte Carlo continuous energy result. The calculated HTR-PM critical loading height of the HTR-PM is highly consistent with the results of Monte Carlo continuous energy calculation, and the absorber value is also in good agreement. Conclusion Both of these results demonstrate that NECP-Panda possesses exceptional computational power and accuracy for the neutronics calculation of the PB-HTGR, establishing a solid foundation for the development of subsequent modules.
Subjects: Astronomy >> Astrophysical processes submitted time 2023-06-07 Cooperative journals: 《天文学进展》
Abstract： Optical narrow-band observation can characterize the clear structure of the emission line objects, Which is important to study the star-forming region, quasar narrow-line region, H II region, and interstellar medium. Narrow Band Survey (NBS) is a fully photometric CCD survey of the Northern Galactic Plane, which targeted the inner regions of the Northern plane over the latitude range of −5◦< b <+5◦and a longitude range of 29◦< l <215◦covering a total of 1800 deg2. NBS was conducted with three narrow-band filters: Hα filter (80˚Afull width at half-maximum, central wavelength at 6563˚A), [S II] filter (80˚A full width at half-maximum, central wavelength at 6765˚A) and [O III] filter (80˚A full width at half-maximum, central wavelength at 5007˚A). The continuum subtraction is a common method to search for emission-line objects forms the narrow-band images. Traditionally these have been dealt with by carefully registering the images in terms of position,orientation and intensity, and subtracting them from different bands images. This paper uses the [S II] band data of the NBS, proposes a method of subtracting continuum. We introduced SWARP and Source Extract, the SWARP software can automatically match the astronomical positions of the respective sources of the two images, avoid pixel position adjustment and image rotation; The Source Extract software can quickly detect the flux and star image in the wide-band and narrow-band image, and accomplish the flux matching and PSF matching by Python, finally use SWARP to do the batch processing of image subtraction. Compared with the traditional method, this method can improve the efficiency. At present, this method has been applied in searching for the Herbig-Haro objects and Supernova Remnant candidates.
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