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Solar evaporation for simultaneous oil-water separation and electricity generation with Janus wood-based absorbers

Frontiers of Environmental Science & Engineering 2024年第2期18卷 13-23页

作者： Yue Yang Ze Fu Qi Zhang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science&TechnologyNanjing 210094China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesKey Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Oily wastewater from ocean oil spills endangers marine ecosystems and human health. Therefore, developing an effective and sustainable solution for separating oil-water mixtures is urgent. Interfacial solar photothermal evaporation is a promising approach for the complete separation of two-phase mixtures using only solar energy. Herein, we report a carbonized wood-based absorber with Janus structure of comprising a hydrophobic top-layer and an oleophobic bottom-layer for simultaneous solar-driven oil-water separation and electricity generation. Under sunlight irradiation, the rapid evaporation of seawater will induce a separation of oil-water mixtures, and cause a high salt concentration region underlying the interface, while the bottom “bulk water” maintains in a low salt concentration, thus forming a salinity gradient. Electricity can be generated by salinity gradient power. Therefore, oil-water separation efficiency of > 99% and derived extra electricity power of ~0.1 W/m2 is achieved under solar radiation, demonstrating the feasibility of oil-water separation and electricity production synchronously directly using solar energy. This work provides a green and cost-effective path for the separation of oil-water mixtures.

关键词： Oily wastewater Carbonized wood Salinity gradient Electricity generation Solar irradiation

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Research Development of Centroid Deviation Type Spherical Robot

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Recent Patents on Engineering 2023年第2期17卷 1-15页

作者： Jiang, Jingang Zhang, Yi Song, Shichang Sun, Jianpeng Wu, Dianhao Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China School of International Studies Harbin Institute of Technology Harbin150001 China

Background: With the continuous development of science and technology, more and more human work has been replaced by robots because robots can do many jobs that human beings are not competent for. At present, researchers pay more and more attention to a new type of robot, the spherical robot. The most widely used spherical robot is the centroid deviation spherical robot. This paper mainly introduces the driving mode and structure of the spherical robot with centroid deviation. Objective: This paper explores the classification, development, advantages, and disadvantages of the driving modes of the spherical robot with centroid deviation. Methods: This paper reviews various products and patents related to centroid deviation spherical robot. This paper also introduces the structural characteristics, differences, and applications of the existing spherical robots with centroid deviation. Results: This paper compares and analyzes various spherical robots with centroid deviation, and their typical characteristics are summarized. This paper analyzes the main problems existing in various structures of the spherical robot, looks forward to the development trend of spherical robot, and discusses the research status and future of products and patents of the spherical robot. Conclusion: According to different driving modes, the spherical robot with centroid deviation can be divided into single pendulum drive, double pendulum drive, trolley drive, rolling body drive, and multi mass block drive. Among them, single pendulum drive, trolley drive, and rolling element drive are the most studied. At present, the structures of products and patents are similar, and the research direction has shifted from innovation to optimization. © 2023 Bentham Science Publishers.

关键词： Pendulums

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Self-powered and bipolar photodetector based on a van der Waals metal-semiconductor junction:Graphene/WSe_(2)/Fe_(3)GeTe_(2) heterojunction

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Science China(Technological Sciences) 2022年第6期65卷 1263-1272页

作者： XU GuoLiang LIU DanMin LI JingZhen LI JingJie YE ShuaiShuai Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Optoelectronics Technology College of MicroelectronicsFaculty of Information TechnologyBeijing University of TechnologyBeijing 100124China

A self-driven photosensor with signal-reversal response has the potential to work as a photodetector in complex environments with multiple signals owing to better signal recognition and enhanced signal-processing ***,a metal-semiconductor-metal photodetector based on ambipolar WSe_(2) with two electrodes comprising two-dimensional(2 D) van der Waals(vdWs) metal Fe_(3)GeTe_(2) and semimetal graphene was proposed to form an asymmetrical metal-contacted architecture with different Schottky barrier *** regulating gate field-induced Fermi level shift in WSe_(2) can be used to manipulate the WSe_(2) channel’s carrier type,resulting in a polarity-reversible photodetector without a bias ***,the photovoltaic effect can be observed from wavelengths of 450 nm(visible) to 850 nm(infrared) without external *** large open voltage is -0.177 V and short-circuit current is 17 nA under a 650-nm excitation *** reported WSe_(2)-based photodetector exhibits excellent properties under zero bias,including a large photo-to-dark current ratio greater than 10^(6) with dark current less than 1 fA,photovoltaic performance with an external quantum efficiency of 27.14%,an excellent detectivity of 3.4×10^(10) Jones,and a high responsivity of 116.38 mA/*** electron transfer occurs at the interface between WSe_(2) and vd Ws electrodes,resulting in a 370-μs response speed owing to the clean and nondestructive interfaces between vd Ws metals and WSe_(2).This study demonstrates the wide application prospect of the vd Ws metal Fe_(3)GeTe_(2) as an electrode forming a Schottky junction for realizing a photodetector without an external voltage and accelerates the development of 2 D photosensors with various working modes.

关键词： photodetector zero-biased WSe_(2) polarity-reversible van der Waals electrodes

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Improving flexural strength of Ti_(2)C-Ti cermet by hot compressive deformation:Microstructure evolution and fracture behaviors

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Science China(Technological Sciences) 2023年第11期66卷 3298-3308页

作者： SUN FengBo WANG Shuai CHEN Xin ZHANG Rui AN Qi LIU WenQi HUANG LuJun GENG Lin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

In order to improve the microstructure and mechanical properties,the hot compressive deformation with 50%height reduction at 1100℃was conducted on a Ti_(2)C-Ti *** results showed that the lamellar Ti precipitates in Ti_(2)C grains were transformed to bimodal size distribution,which was approximately 290 nm and 5.8μm in diameter,respectively,after the hot *** bimodal Ti precipitates suppressed{011}cleavage surfaces of Ti_(2)C during flexural fracture,which resulted in an 18.5%increment of *** phenomenon can be attributed to the bimodal Ti precipitates that decreased the average crack driving force due to their gentle variation in elastic modulus compared with the monolithic lamellar Ti *** present work can guide further deformation and mechanical property improvement of Ti_(2)C cermets.

关键词： cermet sub-stoichiometric titanium carbide hot deformation precipitate fracture behavior

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A Review on End-effectors of Robotic Grinding

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Recent Patents on Engineering 2023年第1期17卷 85-101页

作者： Tang, Dedong Li, Fengxiao Jiang, Jingang Song, Shichang Zeng, Yang Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China School of International Studies Harbin Institute of Technology Harbin150001 China

Background: As a kind of device applied to grinding, the robot grinding end-effector, combining force control structure, adaptive structure, and other structures, has been widely used in machine grinding. Grinding end-effectors can greatly help industrial robot technology used in operations that require continuous contact, such as polishing, grinding, deburring, chamfering, and assembly. Therefore, the structure design of the end-effector will become an inevitable trend in the research on robot grinding in the future. Objective: The existing grinding end-effectors for robot grinding are summarized, and their classi-fication, characteristics, and development are introduced. Methods: Various products and designs related to grinding end-effectors are summarized. The structural features, differences, and applications of typical grinding end-effectors are introduced. Results: Three typical end-effectors are analyzed. The structural features and functions are summa-rized, and the development trend has been prospected. The current situation and future research di-rection of grinding end-effector products and patents are discussed. Conclusion: Grinding end-effectors are classified into the force-controlled grinding end-effector, the adaptive grinding end-effector, and the special structure grinding end-effector. The grinding end-effector plays an important role in promoting the development of the robot grinding industry, improving the surface quality of parts and the finishing process. The grinding end-effector needs further improvement in image processing, humanization, force control, and so on. More in-depth research should be carried out in this direction. © 2023 Bentham Science Publishers.

关键词： Force control

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An ionic liquid-assisted strategy for enhanced anticorrosion of low-energy PEO coatings on magnesium–lithium alloy

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Journal of Magnesium and Alloys 2024年第6期12卷 2380-2396页

作者： You Zhang Chuping Chen Haoyue Tian Shuqi Wang Chen Wen Fei Chen College of New Materials and Chemical Engineering Hydrogen Energy Research CentreBeijing Institute of Petrochemical TechnologyBeijing 102617China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Beijing Spacecrafts China Academy of Space TechnologyBeijing 100190China

A low-energy plasma electrolytic oxidation(LePEO)technique is developed to simultaneously improve energy efficiency and *** liquids(1-butyl-3-methylimidazole tetrafluoroborate(BmimBF_(4)))as sustainable corrosion inhibitors are chosen to investigate the corrosion inhibition behavior of ionic liquid(ILs)during the LePEO process for LA91 magnesium-lithium(Mg-Li)*** show that the ionic liquid BmimBF_(4)participates in the LePEO coating formation process,causing an increment in coating thickness and surface *** low conductivity of the ionic liquid is responsible for the voltage and breakdown voltage increases during the LePEO with IL process(LePEO-IL).After adding BmimBF_(4),corrosion current density decreases from 1.159×10^(−4)A·cm^(−2)to 8.143×10^(−6)A·cm^(−2).The impedance modulus increases to 1.048×10^(4)Ω·cm^(−2)and neutral salt spray remains intact for 24 *** superior corrosion resistance of the LePEO coating assisted by ionic liquid could be mainly attributed to its compact and thick barrier layer and physical absorption of ionic *** ionic liquid-assisted LePEO technique provides a promising approach to reducing energy consumption and improving film performance.

关键词： Magnesium-lithium alloy Plasma electrolytic oxidation Low energy Ionic liquid Corrosion resistance

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Multi-scale feature fused stacked autoencoder and its application for soft sensor modeling

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Chinese Journal of Chemical Engineering 2025年 81卷 241-254页

作者： Li, Zhi Xia, Yuchong Long, Jian Liu, Chensheng Zhang, Longfei State Key Laboratory of Industrial Control Technology East China University of Science and Technology Shanghai 200237 China Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China Huzhou Institute of Industrial Control Technology Huzhou313099 China Engineering Research Center of Process System Engineering Ministry of Education East China University of Science and Technology Shanghai200237 China

Deep Learning has been widely used to model soft sensors in modern industrial processes with nonlinear variables and uncertainty. Due to the outstanding ability for high-level feature extraction, stacked autoencoder (SAE) has been widely used to improve the model accuracy of soft sensors. However, with the increase of network layers, SAE may encounter serious information loss issues, which affect the modeling performance of soft sensors. Besides, there are typically very few labeled samples in the data set, which brings challenges to traditional neural networks to solve. In this paper, a multi-scale feature fused stacked autoencoder (MFF-SAE) is suggested for feature representation related to hierarchical output, where stacked autoencoder, mutual information (MI) and multi-scale feature fusion (MFF) strategies are integrated. Based on correlation analysis between output and input variables, critical hidden variables are extracted from the original variables in each autoencoder's input layer, which are correspondingly given varying weights. Besides, an integration strategy based on multi-scale feature fusion is adopted to mitigate the impact of information loss with the deepening of the network layers. Then, the MFF-SAE method is designed and stacked to form deep networks. Two practical industrial processes are utilized to evaluate the performance of MFF-SAE. Results from simulations indicate that in comparison to other cutting-edge techniques, the proposed method may considerably enhance the accuracy of soft sensor modeling, where the suggested method reduces the root mean square error (RMSE) by 71.8%, 17.1% and 64.7%, 15.1%, respectively. © 2025 Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd.

关键词： Frequency estimation

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Fixed-time stabilization of discontinuous spatiotemporal neural networks with time-varying coefficients via aperiodically switching control

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Science China(Information Sciences) 2023年第5期66卷 182-195页

作者： Xiaofang HU Leimin WANG Chuan-Ke ZHANG Xiongbo WAN Yong HE School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education

This paper focuses on the challenge of fixed-time control for spatiotemporal neural networks(SNNs) with discontinuous activations and time-varying coefficients. A novel fixed-time convergence lemma is proposed, which facilitates the handling of time-varying coefficients of SNNs and relaxes the restriction on the non-positive definiteness of the derivative of the Lyapunov function. Besides, a more flexible and economical aperiodically switching control technique is presented to stabilize SNNs within a fixed time,efectively reducing the amount of information transmission and control costs. Under the newly established fixed-time convergence lemma and aperiodically switching controller, many more general algebraic conditions are deduced to ensure the fixed-time stabilization of SNNs. Numerical examples are provided to manifest the validity of the results.

关键词： spatiotemporal neural networks discontinuous activations time-varying coefficients fixed-time stabilization aperiodically switching control

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Phase-gain Dual-parametric Spectrum Measurement in Chaotic Brillouin Optical Correlation Domain Analysis

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IEEE Sensors Journal 2025年第12期25卷 21658-21664页

作者： Chen, Jing Wang, Yahui Ma, Jinglian Huang, Haochen Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan030024 China Taiyuan University of Technology College of Physics and Optoelectronics Taiyuan China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030024 China

In this paper, the chaotic Brillouin phase-gain dual-parametric spectrum (BDS) is measured for the first time, which can realize high-accuracy and large-range dynamic strain demodulation in chaotic Brillouin optical correlation domain analysis (CBOCDA). The phase of the chaotic probe wave is measured by a Sagnac interferometer (SI) combined with an optical bandpass filter (OBPF) and a beat frequency locking technique. The Brillouin gain spectrum (BGS), Brillouin phase-shift spectrum (BPS), and BDS are measured in the chaotic BOCDA system through both simulation and experiment, and the feasibility of their demodulation with high-accuracy and large-range dynamic strain is verified. The chaotic BPS exhibits good linearity at the Brillouin frequency shift (BFS) and can be used to demodulate high-accuracy tiny strains. The measurement error of a 1 μΕ strain is only 0.0446 μΕ. The linear range of the chaotic BDS is extended to 150 MHz, and more than 10 mΕ dynamic strain measurements can be enabled by incorporating the slope-assisted method. © 2001-2012 IEEE.

关键词： Ultraviolet spectroscopy

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Recent Patents on Third Generation Bearing Testing Machine

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Recent Patents on Engineering 2022年第4期16卷 63-80页

作者： Zhao, Yanling Zhang, Huanqing Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology Harbin150080 China

Background: Bearing testing machine is the key equipment for bearing design, theoretical research and improvement, and it plays an important role in the performance of bearing life, fatigue, vibration and working temperature. With the requirements of aerospace, military equipment, automobile manufacturing and other industrial fields of the bearing are becoming higher and higher. There is an urgent need for high-precision and high-efficiency bearing testing machines to monitor and analyze the performance of bearings. Objective: By analyzing the recent patents, the characteristics and existing problems of the current bearing testing machine are summarized to provide references for the development of bearing test equipment in the future. Methods: This paper reviews various representative patents related to the third generation bearing testing machines. Results: Although the structure of bearing testing machines is different, the main problems in the structure and design principle of bearing testing machine have been summarized and analyzed, and the development of trend and direction of the future bearing testing machine have been discussed. Conclusion: Bearing testing machines for health monitoring of bearing life cycle is of great significance. The current bearing testing machine has basically achieved the monitoring and analysis However, due to the emergence of new types of bearings, further improvement is still needed. With the development of testing technology towards intelligent and big data-driven direction, bearing testing machine is moving towards the type of cloud computing and large-scale testing. © 2022 Bentham Science Publishers.

关键词： Life cycle

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