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This paper constructs an immersive multimedia virtual interactive experience technology with the Great Wall World Heritage Site as the experimental object. By analyzing the VR vision system and algorithm, the process of stereo vision perception and the general algorithm of somatic image production are explained. The distance equation and depth calculation in stereoscopic projection are studied, and the virtual interactive experience technology is constructed and applied to the World Heritage Site of the Great Wall. The result data show that the immersive multimedia virtual interactive experience technology highlights the real feeling of users more, in which the model has 50% of the influence on the real feeling, the mapping has 15%, the lighting has 15%, and the rendering has 10%. The youth population has a higher percentage of interest in the virtual field, accounting for 50%, 65%, and 60%, respectively, while the middle-aged stage has a more average degree of interest in the virtual field, with 50% of the average interest, 30% of happy to experience, 25% of not interested and 50% of interested. This thesis is conducive to enriching the project of the Great Wall World Heritage Site and providing an effective reference for technological innovation of immersive multimedia virtual interactive experience.

ObjectiveIn order to put forward suggestions and references for the revision of the standard， knowledge and implementation of the national food safety standard frozen drinks and ingredients （GB 2759—2015） by relevant personnel nationwide were investigated and analyzed.MethodsThe questionnaire survey was conducted. The main respondents were personnel from food production and operation enterprises， health departments， market supervision departments， testing institutions， and so on. The data were statistically analyzed by Microsoft Excel 2013 and SPSS 20.0.ResultsFour hundred and forty valid questionnaires were collected in this survey. The awareness rate of the respondents to GB 2759—2015 was 55.5% （244/440）. They unanimously recognized the important role of the standard on the quality of frozen drinks and food safety， and the overall evaluation of the implementation effect was “good” （with an average of 4.42 points）. Twenty-four effective feedback were received， and 36 people had opinions and suggestions accounting for 15%.ConclusionThe awareness of GB 2759—2015 among the relevant personnel was not good. There was significant difference in the awareness rate among different respondents （P

Compared with oxide, halide, and polymer‐based solid electrolytes, Li‐ion conducting sulfide solid electrolytes exhibit remarkable ionic conductivity, electronic conductivity, and exceptional thermal and mechanical properties. Despite these advantages, the susceptibility of sulfide electrolytes to air and the formation of lithium dendrites on the anode hinder their large‐scale commercial application. In this study, we propose a doping strategy involving the nitrogen (N) element in sulfide electrolyte Li5.5PS4.5Cl1.5 (LPSCl) with inherently high ionic conductivity. We have successfully synthesized Li5.5+xPS4.5−xNxCl1.5(x =.025,.05,.07,.10) solid electrolytes by enhancing their air stability through doping. The modified electrolyte material demonstrates stable cycling performance exhibiting superior air stability compared to Li5.5PS4.5Cl1.5. The results indicate that the doped sulfide solid electrolyte effectively suppresses the growth of lithium dendrites, thereby enhancing the compatibility between the lithium metal anode and sulfide solid electrolyte. [ABSTRACT FROM AUTHOR]

Titanium (Ti) is generally considered as an ideal bipolar plate (BPP) material because of its excellent corrosion resistance, good machinability and lightweight nature. However, the easy-passivation property, which leads to increased interfacial contact resistance (ICR) and subsequently decreased cell performance, limits its large-scale commercial application in proton exchange membrane fuel cells (PEMFCs). In this paper, we proposed a NiTi alloy prepared by suction casting as a promising bipolar plate for PEMFCs. This NiTi alloy exhibits significantly decreased ICR values (16.8 mΩ cm2 at 1.4 MPa) compared with pure Ti (88.6 mΩ cm2 at 1.4 MPa), along with enhanced corrosion resistance compared with pure nickel (Ni). The superior corrosion resistance of NiTi alloy is accredited to the nobler open circuit potential and corrosion potential, coupled with low corrosion current densities and passive current densities. The improved ICR can be interpreted by the existence of high-proportioned metallic Ni in the passive film, which contributes to the reduced capacitance characteristic of the passive film (compared with Ti) and enhances charge conduction. This work provides a feasible option to ameliorate BPP material that may have desirable corrosion resistance and ICR. [ABSTRACT FROM AUTHOR]

Real-time simulation of ring-grid laser images using the conventional method has several drawbacks, including weak edge fitting, poor clarity, low image recognition rates, uneven brightness distribution, and significant ring-grid laser image interference from the surrounding environment. In this research, we develop the diagonalizable and readily invertible Hessian matrix, offer an enhanced Newton projection iteration algorithm, and use the degenerate gradient magnitude as the constraint set. We also develop a real-time re-illumination model appropriate for modeling ring-grid laser maps and suggest a method for simulating ring-grid laser maps based on it. The simulations demonstrate that the suggested method successfully matches ring-grid laser pictures in real time with little relative error and deviation, a high signal-to-noise ratio, and pleasing aesthetic effects. [ABSTRACT FROM AUTHOR]