分类: 工程与技术科学 >> 工程与技术科学其他学科 提交时间: 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要: To optimize the cultural experience of users in using digital creative products of intangible cultural heritage and enhance the promotion of intangible cultural heritage projects, this paper proposes a corresponding product design method based on the Flow theory. Taking the factors of the Flow theory as the starting point, this paper combines the user experience process corresponding to the use scenario of NRM digital creative products, from which the the Flow journey diagram of general users in the NRM experience is summarized and optimized, and the specific design solution process is constructed in this way. This paper introduces the Flow theory to NRM. And this paper introduces the Flow theory into the design and application of digital creative products of intangible cultural heritage, to improve the immersion experience of existing digital creative products of intangible cultural heritage, enhance the bond between users and intangible cultural heritage, and also provide theoretical and practical references for the preservation and innovative transformation of intangible cultural heritage.
分类: 天文学 >> 天文学 提交时间: 2023-02-19
摘要: Using the JVLA, we explored the Galactic center (GC) with a resolution of 0.05" at 33.0 and 44.6 GHz. We detected 64 hyper-compact radio sources (HCRs) in the central parsec. The dense group of HCRs can be divided into three spectral types: 38 steep-spectrum ($\alpha\le-0.5$) sources; 10 flat-spectrum ($-0.50.2$, assuming $S\propto\nu^\alpha$. The steep-spectrum HCRs are likely represent a population of massive stellar remnants associated with nonthermal compact radio sources powered by neutron stars and stellar black holes. The surface-density distribution of the HCRs as function of radial distance ($R$) from Sgr~A* can be described as a steep power-law $\Sigma (R) \propto R^{-\Gamma}$, with $\Gamma=1.6\pm0.2$, along with presence of a localized order-of-magnitude enhancement in the range 0.1-0.3 pc. The steeper profile of the HCRs relative to that of the central cluster might result from the concentration massive stellar remnants by mass segregation at the GC. The GC magnetar SGR~J1745-2900 belongs to the inverted-spectrum sub-sample. We find that two spectral components present in the averaged radio spectrum of SGR~J1745-2900, separated at $\nu\sim30$ GHz. The centimeter-component is fitted to a power-law with $\alpha_{cm}=-1.5\pm0.6$. The enhanced millimeter-component shows a rising spectrum $\alpha_{mm}=1.1\pm0.2$. Based on the ALMA observations at 225 GHz, we find that the GC magnetar is highly variable on a day-to-day time scale, showing variations up to a factor of 6. Further JVLA and ALMA observations of the variability, spectrum, and polarization of the HCRs are critical for determining whether they are associated with stellar remnants.
分类: 天文学 >> 天文学 提交时间: 2024-05-10 合作期刊: 《Research in Astronomy and Astrophysics》
摘要: We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton observations. We obtain detailed temperature, pressure, and entropy maps with the contour binning method, and find a hot region in the NW direction. The X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE direction. Combined with the galaxy luminosity density map we propose a weak merger scenario. A young sub-cluster passing from the SE to NW direction could explain the optical subpeak, the intracluster medium temperature map, the X-ray surface brightness excess, and the X-ray peak offset together.