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您的检索式：作者名="Tianyi Zhi"
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| 1 | Reduced Graphene Oxide Mediated SnO_2 Nanocrystals for Enhanced Gas-sensing Properties显示文摘SnO2 ereduced graphene oxide (SnO2-rGO) composites were prepared via a hydro-thermal reaction of graphene oxide (GO) and SnCl2·2H2O in the mixed solvent of ethylene glycol and water. During the redox reaction, GO was reduced to rGO while Sn2+ was oxidized to SnO2, uniformly depositing on the surface of rGO sheets. The composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), infrared spectra analysis (IR) and transmission electron microscopy (TEM), respectively, and their gas sensing properties were further investigated. Compared with pure SnO2 nanoparticles, the as-prepared SnO2-rGO gas sensor showed much better gas sensing behavior in sensitivity and response-recovery time to ethanol and H2S at low concentrations. Overall, the highly sensitive, quickresponding and low cost SnO2-rGO gas sensor could be potentially applied in environmental monitoring area. | Yanhong Chang Yunfeng Yao Bin Wang Hui Luo Tianyi Li Linjie Zhi | 2013 | Journal of Materials Science & Technology2013，29，2： | 7 |
| 2 | Online Teaching for Elementary and Secondary Schools During COVID-19显示文摘This report draws on data from two articles published by the Center for Teacher Education Research of Beijing Normal University,namely,“Survey Report on the Status Quo of Online Teaching and Related Needs Among Elementary and Secondary Schools During COVID-19 Prevention and Control:Based on a Sample Survey on School Principals in China”and“Survey Report on the Status Quo of Online Teaching and Related Needs Among Elementary and Secondary School Teachers During COVID-19 Prevention and Control:Based on a Sample Survey on Teachers in China.” | Huan Song Jianjian Wu Tianyi Zhi | 2020 | ECNU Review of Education2020，3，4： | 3 |
| 3 | Electron densitymap evaluation functions for determining the quality of protein crystal structures显示文摘Background Finding methods to judge the quality of X-ray crystallographic information is an active research topic.The quality of electron density maps reconstructed by Fourier transform is always limited by the finite resolution,the amplitude/phase error and the completeness of diffraction data.At present,the R value and effective resolution are common ways of evaluating the quality of electron density maps.Unfortunately,the current evaluation methods are only dependent on diffraction amplitude,without any phase information.Methods Advanced evaluation functions in real space are designed to estimate the electron density map quality.The electron density map definition evaluation function relies on the atomicity of the electron density distribution.We use the power spectrum electron density entropy in protein crystallography for the first time.These two functions include both structure factor amplitudes and phases via the Fourier transform of electron density map.Results We carry out tests on synthetic data sets of known structures,varying the resolution and error,and draw the quality curves of electron density maps with theoretical,noisy and experimental diffraction data by two evaluation functions at different resolutions.The curves reveal the optimum structure and resolution of proteins clearly.Conclusions The work presented here offers new methods to evaluate the qualities of the electron density maps of proteins with slight differences,and brand new indicators to select the optimum diffraction resolution of protein structures. | Tianyi Zhang Zhi Geng Heng Zhang Liang Zhou Yuhui Dong | 2018 | Radiation Detection Technology and Methods2018，2，2： | 0 |
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