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33 results on '"Qu, Nannan"'

11. Wood fiber aerogel-based super hydrophilic and lipophobic porous structure as a photothermal material for efficient solar steam.

Author

Qu, Nannan, Zhang, Bin, Jiang, Shuai, Lu, Haijing, Zhang, Yuhan, and Chen, Lihua

Subjects
*SOLAR thermal energy, *WOOD, *PHOTOTHERMAL conversion, *POROUS materials, *FIBERS
Abstract

We demonstrate in this paper a super-hydrophilic and oleophobic green porous photothermal material based on wood fiber as a novel oil-repellent photothermal material for efficient solar vapor generation (WF-SP). WF-SP is an excellent light-absorbing material with the advantages of a porous nanostructure, super-hydrophilic, low thermal conductivity, high-temperature resistance, and oleophobicity. Based on these advantages, WF-SP exhibits good solar photothermal conversion performance with solar vapor generation efficiencies of 85.4%, 75.3%, and 70.2% at 1 kW m−2, 2 kW m−2, and 3 kW m−2 radiation intensities, respectively. The results provide new possibilities for the design and preparation of low-cost, green, and pollution-free photothermal materials with high solar thermal conversion efficiency for solar photothermal conversion vapor generation. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Risk Analysis and Intervention Policy Research of Miners’ Unsafe Behavior Based on System Dynamics

Author

Wang Yunna, Qu Nannan, Cao Qinggui, and Ren Han

Subjects
Risk analysis, business.industry, Intervention (counseling), Environmental health, Medicine, ComputerApplications_COMPUTERSINOTHERSYSTEMS, business, complex mixtures, System dynamics
Abstract

With the application and development of the discipline of safety science and safety economy in enterprises, people gradually began to realize that the unsafe behavior of employees themselves is an important source of coal mine safety issues. This paper constructs a behavioral risk model based on the employee behavior risk in coal mines combined with ALARP principle, and establishes a coal mine safety production organization behavior expectation utility model based on von Neumann Morgan Stan’s utility function. Based on this risk model, employees at different stages are Risk attitude analysis of risk appetite, using Vensim software to construct the model of unsafe behavior level of coal mine workers, and obtaining the trend of unsafe behavior level of coal mine workers through model simulation. Based on the simulation results, the behavioral risk management decision research is carried out to realize the behavior of coal mine employees.

Published
2019

22. Genetic characteristics, pathogenicity and transmission of H5N6 highly pathogenic avian influenza viruses in Southern China

Author

Qu, Nannan, primary, Zhao, Bingbing, additional, Chen, Zuxian, additional, He, Zhuoliang, additional, Li, Weiqiang, additional, Liu, Zhiting, additional, Wang, Xia, additional, Huang, Jianni, additional, Zhang, You, additional, He, Wanting, additional, Sun, Jie, additional, Qin, Zhifeng, additional, Liao, Ming, additional, and Jiao, Peirong, additional

Published
2019
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25. From BiI3 to CuBiI4: a striking improvement in the photoelectric performance of a novel photodetector candidate.

Author

Qu, Nannan, Lei, Yan, Yang, Xiaogang, Hu, Xiaojing, Zhao, Wencai, Zhao, Chaoliang, and Zheng, Zhi

Abstract

Bismuth halide based semiconductors have attracted increasing attention as the next generation photodetectors because of their excellent photoelectric performance, environmental friendliness, and high-element-abundance characteristics. However, it is still challenging to prepare a thin film under normal conditions because of the instability of BiI3. In this work, we use a room temperature elemental powder reaction in ambient conditions for the easy preparation of Cu incorporated perovskite-like CuBiI4 on a large scale. The crystalline and photoelectric characteristics of the resulting CuBiI4 thin films with different initial Cu content have been investigated by X-ray diffraction (XRD), UV-Vis spectroscopy, photoluminescence spectroscopy (PL), and transient surface photovoltage (TSPV) studies. The CuBiI4 based photodetectors were first assembled, which showed a striking improvement in the responsivity of the photodetectors compared with pure binary BiI3. Particularly, the responsivity of the photodetector with a 1 : 1 molar ratio of copper to bismuth is 106 times larger than that with an initial molar ratio of 0 : 1 (pure BiI3). A possible mechanism for such an improvement was preliminarily discussed by taking advantage of the Hall effect measurements. Our work not only provides a universal synthetic strategy for preparing high quality Bi-based perovskite-like photoelectric materials but also presents a novel Bi-based photodetector material. [ABSTRACT FROM AUTHOR]

Published
2020
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28. MXene/Ag3PO4Modified PVDF Composite Membranes for Efficient Interfacial Evaporation and Photodegradation

Author

Mu, Xiaotong, Chen, Lihua, Qu, Nannan, Yin, Min, Wu, Shang, Hasi, Qimeige, and Xiao, Chaohu

Abstract

Solar-powered interface evaporation is considered a promising technology to obtain freshwater from non-potable water by using sustainable solar energy. However, research on combining the photocatalytic effect with solar interfacial evaporation technology to go for photothermal conversion materials with full solar spectrum utilization for photothermal and photodegradation capabilities is still scarce. Due to the unique optical properties of MXene, a novel MXene/Ag3PO4-based membrane with synergistic photothermal and photocatalytic effects was developed from the perspective of practical applications such as water purification, photodegradation of organic dyes and antibacterial properties. In this paper, polyvinylidene fluoride (PVDF) and carbon black (CB) were used as the substrate, calcium carbonate (CaCO3) and hydrochloric acid (HCl) were selected as the pore-forming agent for hydrophilic modification, and MXene/Ag3PO4serves as the photocatalyst. The prepared composite polyvinylidene fluoride membrane (PCC-MXene/Ag3PO4) with Schottky junction, possesses a rich pore structure, abundant water molecule transport channels, high light absorption ability, and low thermal conductivity, which lead to a good performance in solar interface evaporation, photodegradation and antibacterial. The superhydrophobicity and floatability of the nanosponges in water enable them to continuously pump water, which greatly promotes the dissolution of salt accumulation. With the help of porous nanosponges, PCC-MXene/Ag3PO4exhibits excellent evaporation stability and salt resistance under 1kWm-2solar irradiation, as well as photodegradation of organic dyes. In addition, the PCC-MXene/Ag3PO4membrane has the properties of self-buoyancy, electrical conductivity, and superior flexibility. Therefore, considering the simple preparation method and fine performances, the PCC-MXene/Ag3PO4mixed membrane has great application potential in the study of interface evaporation, photodegradation of organic dyes, and antibacterial properties.

Published
2024
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33. Group dynamics analysis and the correction of coal miners' unsafe behaviors.

Author

Wang L, Cao Q, Han C, Song J, and Qu N

Subjects
Accidents, Occupational prevention & control, Accidents, Occupational psychology, China epidemiology, Coal Mining, Humans, Models, Psychological, Safety Management, Dangerous Behavior, Group Processes, Miners psychology, Occupational Health
Abstract

The rate of coal mine accidents in China is still high and most coal mine accidents are caused by human unsafe behavior, and the correction of the behavior is, therefore, paramount. In this article, a group dynamics field model and a hierarchical index system of the group dynamics factors of the unsafe behavior of coal miners are established. The internal and external dynamics of groups are analyzed and the importance of each factor is calculated and determined. On this basis, suggested correction measures are put forward. Then, in combination with a questionnaire, the corrective measures of unsafe behaviors are determined and simulated. The results show that, while the correction of unsafe behaviors both in progress and after implementation can achieve good results, the former is more effective than the latter. Via the present research, both unsafe behaviors and the occurrence of coal mine accidents can be effectively prevented, and the safety of coal mine production can be ensured.

Published
2021
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