Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: In this study, TBAB hydrates were synthesized and their carbon capture capacity from a ternary gas mixture of CH4/CO2/N-2 was investigated. The addition of TBAB increased the specific surface area of the hydrate crystals and transformed the hydrate structure. These findings are important for the development of hydrate gas separation technology.
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Thermodynamics
Zucheng Cheng, Lintao Sun, Yingying Liu, Huazheng Xu, Lanlan Jiang, Lei Wang, Yongchen Song
Summary: This study investigated the effect of TBAB hydrate structure transformation on CO2-CH4 separation efficiency. The results showed that the gas consumption increased with increasing subcooling for the 10 wt% TBAB system but decreased for the 20 wt% TBAB system. At certain conditions, a high separation factor and CO2 recovery were achieved. A comparison of the hydrate structure revealed different behavior in the 10 wt% and 20 wt% TBAB systems.
Article
Chemistry, Multidisciplinary
Takuma Misawa, Tomoaki Ishikawa, Satoshi Takeya, Saman Alavi, Ryo Ohmura
Summary: CO2 separation from H2 + CO2 gas mixture is essential for stable supply of blue hydrogen, and hydrate-based CO2 separation is a superior technology in terms of environmental and economic aspects. The study showed successful CO2 separation in the H2 + CO2 + CP + H2O system at 284 K, but with an increase in energy costs due to hydrogen loss.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Energy & Fuels
Qi-Rong Zuo, Ming Gao, Peng Kong, Li-Xin Zhang
Summary: The microscopic characteristics and agglomerating morphologies of hydrate crystals are crucial for flow assurance and heat transfer in hydrate reaction equipment. In this study, experimental quartz tubes with small diameters were used to investigate the effects of supercooling, solution concentration, tube diameter, and flow rate on hydrate blockage time and agglomeration morphology. The research findings suggest that the density of single crystal hydrate formed in 10 wt%-20 wt% TBAB hydrate solution is low, with a needle-like or sword-like crystal front, promoting mass and heat transfer. High concentration TBAB solution (30 wt%-40 wt%) results in dense hydrate crystals with weakened tip effect. Increasing flow rate inhibits the growth of large crystals and promotes the formation of new nuclei in low concentration TBAB solution. Adjustable flow rates can produce grout solutions with different particle sizes. The initial morphology of TBAB hydrate crystals includes spherical and cylindrical shapes, and their morphological evolution process is similar. A microscopic physical model of TBAB hydrate growth and agglomeration process was established.
Article
Energy & Fuels
Yu Wei, Qimeng Yang, Xuehua Zhang, Nobuo Maeda
Summary: This study investigated the shear strength of THF hydrate on substrates with different hydrophobicity and the impact of PVP. The results showed a decrease in critical shear stress with heating and an increase with the addition of PVP. Interestingly, the hydrates exhibited higher adhesive strength on hydrophobic substrates compared to hydrophilic ones.
Article
Energy & Fuels
Meng-yang Li, Ming Gao, Qi-rong Zuo, Yu-gang Zhao, Li-xin Zhang
Summary: This study investigated the nucleation process of TBAB hydrate using high-speed photography and proposed a model for calculating the Gibbs free energy required for hydrate nucleation. The maximum critical nucleation size of A-type TBAB hydrate was calculated to be about 29 Å, and that of B-type TBAB hydrate was approximately 15.6 Å, providing insights for further research on hydrate formation kinetics.
Article
Engineering, Chemical
Xi-Yue Li, Jin Yan, Dong-Liang Zhong, Shi-Jian Lu, Bin-Bin Ge
Summary: This study investigated the formation of tetra-n-butyl ammonium bromide (TBAB) semiclathrate hydrate for CO2 capture through experiments and in situ Raman spectroscopy. The impacts of TBAB concentration and operating temperature on CO2 incorporation into TBAB semiclathrates were analyzed. The results showed that the structure transition of TBAB semiclathrates from type A to type B occurred in the presence of CO2, resulting in increased CO2 consumption. The TBAB semiclathrate formed at 2.57 mol % TBAB and 282.15 K was found to be a suitable system for CO2 capture.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Shu-Li Wang, Yan-Yun Xiao, Shi-Dong Zhou, Kun Jiang, Yi-Song Yu, Yong-Chao Rao
Summary: In this study, the thermodynamics and kinetics of hydrate formation in 9.01 wt% TBAB mixed with MWCNTol were investigated. The results showed that MWCNTols had little effect on CO2 hydrate formation phase equilibrium, but they significantly shortened the induction time. The addition of nanoparticles increased the final gas consumption, with the 9.01 wt% TBAB + 0.08 wt% GN system showing the highest increase. The best system was the 9.01 wt% TBAB + 0.02 wt% MWCNTol at 3.5 MPa and 277.15 K, reducing the induction time by 66.67% and increasing the final gas consumption by 284.11%. This work contributes to the industrial application of hydrate technology in CO2 capture and storage.
Article
Thermodynamics
Jose M. Chima-Maceda, Alfredo Pimentel-Rodas, Luis A. Galicia-Luna, Angel M. Notario-Lopez
Summary: Experimental measurements of hydrate dissociation conditions were conducted for three multi-component systems, with good agreement found between the experimental data and literature data, indicating the viability of the experimental technique. The uncertainties in temperature and pressure were determined to be 0.16 K and 0.04 MPa, respectively, with a relative standard uncertainty in composition estimated to be 0.0014.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
Hussein Hassan, Soheil Zebardast, Mohsen Gandomkar
Summary: The study found that TBAB, TBPB, and TBAB + TBPB mixture have a promoting effect on CH4 hydrate dissociation conditions, which can be used to improve the efficiency of hydrate systems.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Environmental
Yuxuan Zhang, Zhongbin Zhang, Xiaoqiang Zhai, Yixiang Gan, Benjapon Chalermsinsuwan, Xiaolin Wang
Summary: Gas hydrates play a crucial role in the capture, storage, transport, and utilization of various gases. The dissociation kinetics of gas hydrates greatly affects gas transport and recovery efficiency. Encapsulation has been shown to be an effective technique for improving gas hydrate formation kinetics. In this study, the dissociation kinetics of encapsulated CO2-TBAB semi-clathrate hydrates in different shapes are experimentally investigated, and a two-stage numerical model is developed to simulate the dissociation process. The results show that the surface-to-volume ratio of the capsule and the dissociation driving force are the main factors influencing the dissociation kinetics, and the ring-shaped capsule exhibits the most efficient dissociation process. This work enhances the understanding of gas hydrate dissociation behavior in individual capsules and provides guidance for efficient hydrate-based gas transport and recovery.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study examined the formation kinetics of ternary gas mixture hydrates using synthesized cyclopentane and sodium dodecyl sulfate as additives. The results showed that the use of mixed additives can promote hydrate formation and enhance gas separation under specific conditions. Increasing the concentration of sodium dodecyl sulfate can smoothen the hydrate crystal surface, resulting in more complete crystallization.
Article
Engineering, Chemical
Bin-Bin Ge, Jin Yan, Dong-Liang Zhong, Yi-Yu Lu, Xi-Yue Li
Summary: CO2 capture was experimentally investigated by forming TBAB semiclathrate in a new system of TBAB + graphite nanofluids. The system of TBAB + graphite nanofluids showed preference for CO2 capture compared to TBAB solution and TBAB + SDS solution. The optimal concentration of 0.2 wt.% graphite nanoparticles was found to enhance hydrate growth in TBAB + graphite nanofluids.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Guodong Zhang, Penghui Song, Yaning Kong, Fei Wang
Summary: This study presents a spiral-agitated hydrate formation setup for continuous production of solidified natural gas (SNG) hydrates. Amino acids were used to enhance the formation kinetics, resulting in fast nucleation, growth, and high conversion. The technology has wide applications in carbon capture, utilization, and storage (CCUS).
Article
Engineering, Environmental
Jie Xu, Kangning Wang, Yanyan Li, Yue Li, Bingxin Li, Hangqi Luo, Huiling Shi, Xueran Guan, Ting Zhang, Yixiao Sun, Feng Chen, Huacheng He, Junwen Zhang, Lin Cai, Wenxiang Song, Jiang Wu, Xiaokun Li
Summary: This study developed an injectable host-guest drug delivery system that combines the therapeutic effects of hydrophilic bFGF and hydrophobic anti-inflammatory drug Pinocembrin for effective wound repair. The results demonstrated the potential of combining anti-inflammatory drugs with growth factors for wound healing.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Junwen Zhang, Guoqiang Li, Sizhe Xing, Nan Chi
Summary: With the adoption of the single-wavelength 50G PON standard, research on the next-generation optical access network beyond 50G has begun. Coherent passive optical network (C-PON) based on multi-access coherent optics and DSP is a promising candidate for future high-speed PON, thanks to its superior sensitivity. This paper reviews recent studies and progress on flexible C-PON in terms of access speed, multiple-access architecture, and deployment scenarios.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Yanlong Cao, Wenbin Zhu, Jiangxin Yang, Guizhong Fu, Dongyun Lin, Yanpeng Cao
Summary: Visual surface defect inspection is important for assessing product quality in various industrial applications, but it remains challenging to develop deep-learning-based approaches for industrial product defect inspection. To overcome this challenge, we propose a light-weight defect classification model based on pre-trained SqueezeNet architecture and introduce three effective techniques to achieve high accuracy with limited defective training samples. Experimental results validate the effectiveness of our method.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Yanpeng Cao, Rui Liang, Wenbin Zhu, Bowen Zhao, Haotian Chen, Lingfeng Shen, Jiangxin Yang, Yanlong Cao, Jian Chen, Xin Li
Summary: This paper presents a complete framework for rendering and processing dynamic-excitation-based steady-state NLOS images. A virtual rendering pipeline is constructed to generate large-scale rendered images, and a physical hardware setup is built to acquire real-captured images. An end-to-end multi-branch CNN is proposed to reconstruct specular-reflected images of hidden objects. The effectiveness of the method is validated through qualitative and quantitative experiments.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Computer Science, Artificial Intelligence
Zewei He, Du Chen, Yanpeng Cao, Jiangxin Yang, Yanlong Cao, Xin Li, Siliang Tang, Yueting Zhuang, Zhe-ming Lu
Summary: This study proposes an efficient model, SISR-PF-OA, for single image super-resolution, achieving more accurate and faster image restoration by improving feature extraction and fusion techniques. It includes a novel Orientation-Aware feature extraction/selection Module (OAM) and an effective fusion architecture to progressively integrate multi-scale features extracted in different convolutional stages.
PATTERN RECOGNITION
(2023)
Correction
Cell Biology
Xiaodong Su, Yuan Xie, Junwen Zhang, Mingxin Li, Qing Zhang, Guishan Jin, Fusheng Liu
CELL DEATH & DISEASE
(2023)
Article
Physics, Applied
Yingzhe Wang, Xuefeng Zheng, Tian Zhu, Shaozhong Yue, Ailing Pan, Shengrui Xu, Peixian Li, Xiaohua Ma, Jincheng Zhang, Lixin Guo, Yue Hao
Summary: Degradation and defect evolution in GaN-based UV LEDs under 3 MeV proton irradiation were investigated thoroughly in this study. An intrinsic C-N-related defect with an abnormally decreased concentration after irradiation was identified. A defect evolution model under proton irradiation was established: C atoms departed from the C-N-related defect aligned along the dislocation in the active region stimulated by the displacement damage effect, leaving behind a nitrogen vacancy (V-N) aligned along the dislocation, accompanied by the generation of a non-interacting carbon interstitial (C-i). The increase in V-N and C-i jointly contributed to the decrease in optical power and the increase in leakage current.
APPLIED PHYSICS LETTERS
(2023)
Article
Automation & Control Systems
Wenbin Zhu, Rui Liang, Jiangxin Yang, Yanlong Cao, Guizhong Fu, Yanpeng Cao
Summary: In recent years, diverse detection methods have been proposed to achieve highly accurate image segmentation. However, low contrast and background noise interference still pose challenges to defect detection. Existing deep learning-based methods for defect detection mostly learn rich features on the whole image.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Engineering, Electrical & Electronic
Wenqing Niu, Zengyi Xu, Yu Liu, Xianhao Lin, Jifan Cai, Jianyang Shi, Xiaolan Wang, Guangxu Wang, Jianli Zhang, Fengyi Jiang, Zhixue He, Shaohua Yu, Chao Shen, Junwen Zhang, Nan Chi
Summary: Nowadays, there is a growing demand for high-speed information transmission. Visible light communication (VLC) based on light-emitting diodes (LEDs) is considered a prospective candidate for future 6G communication networks. However, VLC systems face challenges due to limited modulation bandwidth and nonlinear characteristics of optoelectronic devices. This paper outlines the current state and challenges of VLC and introduces key technologies for high-speed VLC systems based on silicon (Si) substrate LED. The paper presents an ultrahigh-speed VLC system with an overall data rate of 28.93 Gbit/s, achieved through optimized LED arrays and advanced digital signal processing methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jianyang Shi, Wenqing Niu, Ziwei Li, Chao Shen, Junwen Zhang, Shaohua Yu, Nan Chi
Summary: This paper proposes a neural network-based auto equalization model (NNAEM) for achieving high-speed underwater visible light communication (VLC) with a bandwidth-limited green LED. Experimental results show that the proposed method enables a data rate of 3.451 Gbps in an underwater VLC link, which is an improvement of 30.4% compared to other advanced digital signal processing (DSP) methods. The scenario adaptation and robustness of the NNAEM are also verified, demonstrating its importance in underwater high-speed VLC transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Fan Liu, Yanlong Cao, Tukun Li, Lifei Ren, Junnan Zhi, Jiangxin Yang, Xiangqian Jiang
Summary: This paper presents a novel fast method called the Iterative Minimum Zone Algorithm (IMZA) for evaluating cylindricity deviation on a large number of measurement points. It is crucial for quality control of high-value products and components when using modern instruments such as roundness testers and 3D laser/CT scanners. The method strictly adheres to the latest ISO definition and shows fast and accurate evaluation of cylindricity deviation with a large number of measurement points, as proven by comparison with typical approaches on both simulated and measured data.
Review
Optics
Xingchen Liu, Junhui Hu, Qijun Bian, Shulan Yi, Yingnan Ma, Jianyang Shi, Ziwei Li, Junwen Zhang, Nan Chi, Chao Shen
Summary: The introduction of visible light communication (VLC) technology can enhance the capacity of existing wireless communication systems for 6G networks by utilizing lighting system infrastructures. Semiconductor light sources such as LEDs and LDs play a crucial role in VLC technology due to their energy-efficiency and long lifespans. Various technologies including injection locking have been employed to achieve high-speed VLC links. This paper provides a comprehensive review on the implementation of the injection-locking technique in optical communication systems, elucidates the enhancement of characteristics through OIL, discusses the applications of OIL in VLC systems, and evaluates the prospects of OIL for future VLC systems.
Article
Computer Science, Hardware & Architecture
Sizhe Xing, Guoqiang Li, An Yan, Wangwei Shen, Zhongya Li, Jiaye Wang, Jianyang Shi, Zhixue He, Nan Chi, Junwen Zhang
Summary: The coherent passive optical network (CPON) has gained attention due to its superior performance. Probabilistic shaping (PS) has been introduced for adaptive rate adjustment in flexible coherent passive optical networks (FLCS-CPON). However, the classical probabilistic shaping (CPS) technology is less efficient in CPON systems without optical amplifiers. This study explores the use cases of PS in FLCS-CPON and demonstrates a hybrid PS-based FLCS-CPON without optical amplifiers, achieving higher peak rate and dynamic range improvement.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Gastroenterology & Hepatology
Peng Li, Zheng Zhang, Sheng Wang, Zhendong Jin, Yiqi Du, Aiming Yang, Yunlu Feng, Xiaoping Zou, Lei Wang, Xiaoyan Wang, Li Tian, Pinghong Zhou, Yiqun Zhang, Jun Liu, Zhen Ding, Junwen Zhang, Jian Yang, Siyu Sun, Shutian Zhang
Summary: This study evaluated the safety and efficacy of the Hot AXIOS system for PFC drainage in a multicenter Chinese cohort. The results showed that stent placement was successful in all patients and 93.3% of patients achieved clinical success within 60 days after surgery. The study found that a previous pancreatitis attack > 6 months prior was associated with a greater chance of achieving 100% remission of PFCs within 1 month.
ENDOSCOPIC ULTRASOUND
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Penghui Xia, Zhongya Li, Nanan Ning, Qiang Zhang, Xiaoqing Jiang, Jianyi Yang, Junwen Zhang, Hui Yu
Summary: We demonstrate 2 Tbit/s (8x250 Gbit/s) and 1.6 Tbit/s (8X200 Gbit/s) 4-level pulse amplitude modulation (PAM4) transmissions over 1 km and 10 km single mode fibers (SMF) with an all-silicon wavelength division multiplexing transmitter chip.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Article
Energy & Fuels
Laura L. Trinkies, Marlene Crone, Michael Tuerk, Manfred Kraut, Roland Dittmeyer
Summary: In this study, mono- and bimetallic Pd and Pt catalysts were deposited via supercritical fluid reactive deposition (SFRD) on TiO2 coated additively manufactured substrates. The focus of this work was to evaluate the suitability of these catalysts for the direct synthesis of H2O2 in the liquid phase. The results showed that all catalysts exhibited high activity and productivity, with PdPt bimetallic catalysts showing the highest productivity and an increase in Pd loading leading to a decrease in productivity. Comparison with literature data demonstrated the high suitability of the SFRD method for the proposed application, with the added benefits of simplicity and environmental friendliness in catalyst production.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
Article
Energy & Fuels
Xiongbao Hu, Zuguo Shen, Yu Wang
Summary: It is impossible to control the outer wall temperature of the micro-combustor below the maximum allowable temperature of commercial thermoelectric generators simply through increasing the equivalent heat transfer coefficient. Three simple strategies were developed to improve temperature uniformity, yet none of them could ensure full temperature control.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
