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106 results on '"Xu, Xiaofu"'

17. Impact of artificial reefs on sediment bacterial structure and function in Bohai Bay

Author

Jinsheng Sun, Wang Hong, Gao Yan, Fang Enjun, Dai Yuanyuan, Yu Ying, Zhang Xue, Wang Yu, Xu Xiaofu, Guo Biao, and Liu Kefeng

Subjects
Geologic Sediments, Immunology, Applied Microbiology and Biotechnology, Microbiology, Bacterial cell structure, Molecular ecology, 03 medical and health sciences, chemistry.chemical_compound, Nitrate, RNA, Ribosomal, 16S, Genetics, Animals, Bacterial Structures, Molecular Biology, Reef, 030304 developmental biology, Total organic carbon, 0303 health sciences, geography, geography.geographical_feature_category, Bacteria, Ecology, Coral Reefs, 030306 microbiology, Microbiota, fungi, technology, industry, and agriculture, Sediment, General Medicine, biochemical phenomena, metabolism, and nutrition, Bays, chemistry, Control area, population characteristics, Environmental science, Artificial reef, geographic locations
Abstract

Artificial reefs have significantly altered ecological and environmental conditions compared with natural reefs, but how these changes affect sediment bacteria structure and function is unknown. Here, we compared the structure and function of the sediment bacterial community in the artificial reef area, the future artificial reef area, and the control area in Bohai Bay by 16S rRNA genes sequencing. Our results indicated that bacteria communities in the sediment were both taxonomically and functionally different between the reef area and control area. In the artificial reef area, the α-diversity was significantly lower, whereas the β-diversity was significantly higher. Functional genes related to chemo-heterotrophy, nitrate reduction, hydrocarbon degradation, and the human pathogens and human gut were more abundant, whereas genes related to the metabolism of sulfur compounds were less abundant in the artificial reef than in the control area. The differences in bacterial communities were primarily determined by depth in the artificial reef area, and by total organic carbon in the future reef area and control area. This study provides the first overview of molecular ecology to assess the impacts of artificial reefs on the bacteria community.

Published
2019

19. Lithium Argyrodite as Solid Electrolyte and Cathode Precursor for Solid‐State Batteries with Long Cycle Life

Author

Wang, Shuo, primary, Tang, Mingxue, additional, Zhang, Qinghua, additional, Li, Baohua, additional, Ohno, Saneyuki, additional, Walther, Felix, additional, Pan, Ruijun, additional, Xu, Xiaofu, additional, Xin, Chengzhou, additional, Zhang, Wenbo, additional, Li, Liangliang, additional, Shen, Yang, additional, Richter, Felix H., additional, Janek, Jürgen, additional, and Nan, Ce‐Wen, additional

Published
2021
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22. Restructured rimous copper foam as robust lithium host

Author

Lin, Kui, primary, Xu, Xiaofu, additional, Qin, Xianying, additional, Zhang, Guoqiang, additional, Liu, Ming, additional, Lv, Fengzheng, additional, Xia, Yue, additional, Kang, Feiyu, additional, Chen, Guohua, additional, and Li, Baohua, additional

Published
2020
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25. PID Predictive Control of Automobile Engine Air-Fuel Rati Based on the Unscented Kalman Filter

Author

Xu Xiaofu and Lin Qingzhi

Subjects
Automotive engine, Computer science, 010401 analytical chemistry, Internal model, PID controller, Control engineering, 02 engineering and technology, Kalman filter, 01 natural sciences, System a, 0104 chemical sciences, Model predictive control, Control and Systems Engineering, Robustness (computer science), Control theory, Control system, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing
Abstract

In order to overcome the disadvantage that single-degree-of-freedom PID controller cannot integrate the optimal target tracking performance and anti-interference function, this article puts forward a design of two-degree-of-freedom IMC-PID controller for the time-delay control system according to the Internal Model Control (IMC) principle. It also puts forward a parameter setting method for the two-degree-of-freedom controller based on the maximum sensitivity. First of all, it deduces the relationship between one of the filter parameters with the maximum sensitivity, and determine this parameter according to the maximum sensitivity index, which gives the system strong robustness; then it revises another filter parameter according to the dynamic performance of the system, which gives the system a strong target tracking characteristic. Meanwhile, it conducts the robust stability analysis on the process model mismatch condition, and obtains the conditions for system stability. According to the simulation results, the timedelay control system which is designed based on two-degree-of-freedom IMC-PID controller has good target tracking characteristic, anti-interference performance and robustness, which proves that the parameter setting method which is based on the maximum sensitivity is effective. The negative impact of time delay on the system can be effectively overcome by using the method put forward here.

Published
2016

38. Boosting Sodium Storage in Two-Dimensional Phosphorene/Ti3C2TxMXene Nanoarchitectures with Stable Fluorinated Interphase

Author

Guo, Xin, Zhang, Wenxue, Zhang, Jinqiang, Zhou, Dong, Tang, Xiao, Xu, Xiaofu, Li, Baohua, Liu, Hao, and Wang, Guoxiu

Abstract

The stacking of complementary two-dimensional (2D) materials into hybrid architectures is desirable for batteries with enhanced capacity, fast charging, and long lifetime. However, the 2D heterostructures for energy storage are still underdeveloped, and some associated problems like low Coulombic efficiencies need to be tackled. Herein, we reported a phosphorene/MXene hybrid anode with an in situformed fluorinated interphase for stable and fast sodium storage. The combination of phosphorene nanosheets with Ti3C2TxMXene not only facilitates the migration of both electrons and sodium cations but also alleviates structural expansion of phosphorene and thereby improves the cycling performance of the hybrid anode. X-ray photoelectron spectroscopy in-depth analysis reveals that the fluorine terminated MXene stabilize the solid electrolyte interphase by forming fluorine-rich compounds on the anode surface. Density functional theory calculations confirm that the sodium affinities and diffusion kinetics are significantly enhanced in the phosphorene/MXene heterostructure, particularly in the phosphorene/Ti3C2F2. As a result, the hybrid electrode achieved a high reversible capacity of 535 mAh g–1at 0.1 A g–1and superior cycling performance (343 mAh g–1after 1000 cycles at 1 A g–1with a capacity retention of 87%) in a fluorine-free carbonate electrolyte.

Published
2020
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39. High-performance Li6PS5Cl-based all-solid-state lithium-ion batteries.

Author

Wang, Shuo, Xu, Xiaofu, Zhang, Xue, Xin, Chengzhou, Xu, Bingqing, Li, Liangliang, Lin, Yuan-Hua, Shen, Yang, Li, Baohua, and Nan, Ce-Wen

Abstract

All-solid-state lithium-ion batteries (ASSLIBs) owing to their advantage of enhanced safety are considered to be a promising candidate for next-generation energy storage devices. However, the poor cycling performance and low areal capacities of ASSLIBs with S, Li2S or traditional oxide cathodes hinder the development of high-energy-density ASSLIBs. Herein, a Li6PS5Cl solid-state electrolyte has been systematically investigated for use as a cathode active material in ASSLIBs for the first time. ASSLIBs employing Li6PS5Cl as both the active material and electrolyte with a Li–In alloy anode are fabricated. A Li6PS5Cl-based cell with an active material loading of 3.1 mg cm−2 exhibits a high discharge capacity of around 535 mA h g−1 after 650 cycles at 56 mA g−1 (∼0.1C) at room temperature, which is the highest value among ASSLIBs using sulfide SSEs as active materials and is even comparable with those of cells with S, Li2S or transition metal sulfides as the active material. This superior long-term cycling performance is attributed to the highly reversible electrochemical activity of Li6PS5Cl revealed by ex situ XRD and XPS analyses. [ABSTRACT FROM AUTHOR]

Published
2019
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41. Integrated optofluidic micro-pumps in micro-channels with uniform excitation of a polarization rotating beam

Author

Jiang, Min, Wang, Guanghui, Xu, Wenhao, Xu, Xiaofu, Ji, Wenbin, Zou, Ningmu, and Zhang, Xuping

Abstract

We report an integrated optofluidic micro-pump with a pair of mirrored stirrers of circulating micro-beads in a micro-channel, driven by plasmon-assisted optical manipulation with the excitation of a polarization rotating beam. H-shaped apertures (HSAs) on a gold surface produce strong near-field hot spots when they are illuminated with a light beam polarized parallel to the long axis of “H.” With the rotating of excitation polarization, loops of HSAs with gradually varied orientations can produce the circulation of hot spots, which can further trap micro-beads and make them go around in circles. A different sequence of HSAs can produce a different direction and phase of bead rotation, even under uniform excitation. A pair of mirrored circulations of micro-beads in a micro-channel can induce very effective directional flow. Through numerical modeling, we find that a group of non-synchronized multi-phase mirrored circulations can produce a very uniform flow rate with a speed of more than 10 micrometers per second. These micro-pumps can be heavily integrated and activated by a single beam, while the flow direction of each pump can be regulated, even under a uniform excitation. Our design proposes a new approach for the flow pumping in micro- and nanofluidic devices.

Published
2019

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