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28 results on '"Pan, Dongyu"'

1. Exploring ChatGPT's Ability to Rank Content: A Preliminary Study on Consistency with Human Preferences

Author

Ji, Yunjie, Gong, Yan, Peng, Yiping, Ni, Chao, Sun, Peiyan, Pan, Dongyu, Ma, Baochang, and Li, Xiangang

Subjects
Computer Science - Computation and Language
Abstract

As a natural language assistant, ChatGPT is capable of performing various tasks, including but not limited to article generation, code completion, and data analysis. Furthermore, ChatGPT has consistently demonstrated a remarkable level of accuracy and reliability in terms of content evaluation, exhibiting the capability of mimicking human preferences. To further explore ChatGPT's potential in this regard, a study is conducted to assess its ability to rank content. In order to do so, a test set consisting of prompts is created, covering a wide range of use cases, and five models are utilized to generate corresponding responses. ChatGPT is then instructed to rank the responses generated by these models. The results on the test set show that ChatGPT's ranking preferences are consistent with human to a certain extent. This preliminary experimental finding implies that ChatGPT's zero-shot ranking capability could be used to reduce annotation pressure in a number of ranking tasks.

Published
2023

19. General microemulsion synthesis of organic–inorganic hybrid hollow mesoporous silica spheres with enlarged pore size

Author

Dongming Qi, Yijing Mao, Ningyu Di, Chengyu Zhang, Pan Dongyu, and Yangyi Sun

Subjects
Cyclohexane, Chemistry, Dispersity, 02 engineering and technology, General Chemistry, Mesoporous silica, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Micelle, Catalysis, 0104 chemical sciences, chemistry.chemical_compound, Chemical engineering, Pulmonary surfactant, Amphiphile, Materials Chemistry, Microemulsion, 0210 nano-technology, Mesoporous material
Abstract

In this study, we presented a general simple microemulsion method to synthesize monodisperse organic–inorganic hybrid hollow mesoporous silica spheres (HMNs) with enlarged pore sizes by the co-condensation of TEOS and 1,2-bis(triethoxysilyl)ethane (BTEE). The whole process just involved acid-promoted pre-hydrolysis of TEOS and BTEE to obtain amphiphilic organosilanes to emulsify the oil droplets. Meanwhile, utilizing the composite micelles of CTAB and pore expanders such as the anion surfactant sodium salicylate (NaSaL), nonionic surfactants such as P123 and F127, hydrophobic oils such as cyclohexane (CyH) and 1,3,5-trimethyl benzene (TMB) to jointly construct a stable O/W microemulsion, a hollow structure could be directly obtained, which also exhibited an enlarged pore size. In addition, the diameters, shell thicknesses, and pore sizes (2.5–4.2 nm) could be controlled by adjusting the amounts of expanders. This general microemulsion method can also provide theoretical guidance for the synthesis of other hollow mesoporous spheres.

Published
2019

22. Degradation of Rhodamine B by the α-MnO2/Peroxymonosulfate System

Author

Zhou Qi, Liu Chaonan, Hou Meifang, Xiaoyan Tang, Jian Zhou, and Pan Dongyu

Subjects
Environmental Engineering, Quenching (fluorescence), Ecological Modeling, Radical, Chemical oxygen demand, Inorganic chemistry, 02 engineering and technology, 010501 environmental sciences, 021001 nanoscience & nanotechnology, 01 natural sciences, Pollution, Catalysis, Metal, chemistry.chemical_compound, chemistry, Wastewater, visual_art, Rhodamine B, visual_art.visual_art_medium, Environmental Chemistry, Degradation (geology), 0210 nano-technology, 0105 earth and related environmental sciences, Water Science and Technology, Nuclear chemistry
Abstract

Rhodamine B (RhB) is one of synthetic dyes with good stability. Treatment of wastewater containing synthetic dyes has attracted much attention. Heterogeneous activation of peroxymonosulfate (PMS) has been found to be a promising wastewater treatment technology through the activation with metal oxides for the generation of sulfate radicals. In this study, α-MnO2 was prepared by a simple hydrothermal method and used as the catalyst to activate PMS. The degradation of RhB was studied by the α-MnO2/PMS system. It was found that the prepared α-MnO2 exhibited high catalytic activity on the activation of PMS for the degradation of RhB. The degradation of RhB could be well described by the first-order kinetic model. Influences of PMS concentration and α-MnO2 dose on the degradation of RhB were examined. The chemical oxygen demand (COD) was determined to evaluate the mineralization capability of the α-MnO2/PMS system. The stability of α-MnO2 was also investigated through reusability experiments. Quenching tests of radicals were applied to differentiate the contribution of major reactive species for the degradation of RhB by the α-MnO2/PMS system.

Published
2016

27. Controllable Microemulsion Synthesis of Hybrid TiO2–SiO2Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity

Author

Zhu, Qiangtao, Pan, Dongyu, Sun, Yangyi, and Qi, Dongming

Abstract

Hollow structures in TiO2materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO2materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO2, which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO2–SiO2hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO2at once through the calcination of amorphous TiO2with organosilane at a high temperature of 850 °C. The prepared TiO2–SiO2hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum kvalue of 133.74 × 10–3min–1, which is superior to commercial photocatalyst P25 (k= 114.97 × 10–3min–1). In addition, Au can be doped in the hybrid TiO2–SiO2shell to gain Au-doped hollow spheres that show a high kvalue of up to 694.14 × 10–3min–1, which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO2photocatalyst during calcination but also enables the simple preparation of hollow TiO2-based materials with controllable hollow nanostructures.

Published
2022
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28. Controllable Microemulsion Synthesis of Hybrid TiO 2 -SiO 2 Hollow Spheres and Au-Doped Hollow Spheres with Enhanced Photocatalytic Activity.

Author

Zhu Q, Pan D, Sun Y, and Qi D

Abstract

Hollow structures in TiO 2 materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO 2 materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO 2 , which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO 2 -SiO 2 hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO 2 at once through the calcination of amorphous TiO 2 with organosilane at a high temperature of 850 °C. The prepared TiO 2 -SiO 2 hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum k value of 133.74 × 10 -3 min -1 , which is superior to commercial photocatalyst P25 ( k = 114.97 × 10 -3 min -1 ). In addition, Au can be doped in the hybrid TiO 2 -SiO 2 shell to gain Au-doped hollow spheres that show a high k value of up to 694.14 × 10 -3 min -1 , which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO 2 photocatalyst during calcination but also enables the simple preparation of hollow TiO 2 -based materials with controllable hollow nanostructures.

Published
2022
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