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Effect of baffles on bubble behavior in a bubbling fluidized bed for chemical looping processes

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Particuology 2020年第6期18卷 154-167页

作者： Xiao Zhu xuan feng Yuanyuan Zou Laihong Shen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing 210096China

A bubbling fluidized bed is generally used as the fuel reactor in chemical looping ***,in sufficient gas-solid contact remains a steadfast *** such,we propose the use of in ternal baffles to split bubbles at a high gas velocity and to restrict the movement of large-scale solids in the fluidized *** investigated the effect of baffle arrangement on the bubble size and energy,pressure gradient,particle distribution,and particle velocity in a fluidized bed using a computational particle fluid dynamics simulation based on our experimental *** discuss the main influenci ng factors,which in elude presence of caps,number of baffles,and the baffle opening *** baffle structure with caps efficiently broke the large bubbles without creating jet *** baffles were deemed suitable in the bed owing to the small bubble size and uniform gas-solid distribution in each *** selected a baffle opening ratio of 20.5%,which improved the flow pattern without causing a significant increase in the pressure gradient and particle velocity through the *** also discussed the potential for sea ling up this baffled fluidized bed for industrial applications.

关键词： Baffle Bubble behavior Fluidized bed Chemical looping CPFD simulations

Macroscopic Regulation of Hierarchical Nanostructures in Liquid-crystalline Block Copolymers towards Functional Materials

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Chinese Journal of Polymer Science 2021年第4期39卷 397-416,I0004页

作者： feng Cai Yu-xuan Chen Wen-Zhong Wang Hai-feng Yu Department of Materials Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China

The great potential of liquid-crystalline block copolymers(LCBCs)containing photoresponsive mesogens toward novel applications in photonics and nanotechnology has been attracting increasing attention,due to the combination of the inherent property of microphase separation of block copolymers and the hierarchically-assembled structures of liquid-crystalline polymers(LCPs).The periodically ordered nanostructures in bulk film of LCBCs can be acquired by supramolecular cooperative motion,derived from the interaction between liquid-crystalline elastic deformation and microphase separation,which are able to improve physical properties of polymer film toward advanced functional ***,various micro/nano-patterned structures have been fabricated via light manipulation of photoresponsive LCBCs with good reproducibility and mass *** to recent developments in synthesis and polymerization techniques,diverse azobenzene-containing LCBCs have been designed,resulting in the creation of a wide variety of novel *** review illustrates recent progresses in macroscopic regulation of hierarchical nanostructures in LCBCs towards functional *** existing challenges are also discussed,showing perspectives for future studies.

关键词： Liquid-crystalline block copolymers Microphase separation Hierarchical nanostructures Functional materials

Recovery of PET-quenched Fluorescent Conjugated Polymers with Aza-15-crown-5 as Pendant Groups on Interaction with Ions

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Chinese Journal of Polymer Science 2014年第3期32卷 371-376页

作者：曹靖 Jun-xiang feng 吴诗 College of Chemistry Xiangtan University School of Pharmacy Hubei University of Science and Technology

Novel conjugated polymers with aza-15-crown-5 as pendant groups, P1 were synthesized by the Sonogashira coupling reaction. The polymer P1 was found to show fluorescence en-hancement response towards Ba2＋. The gradual recovery and turning-point of emission intensity of polymers appeared in the addition of Ba2＋, which provided good evidence for the fluorescence amplification mechanism of conjugated polymers.

关键词： Conjugated polymer Fluorescence recovery,

Free-radical evolution and decay in cross-linked polytetrafluoroethylene irradiated by gamma-rays

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Nuclear Science and Techniques 2022年第5期33卷 113-125页

作者： Fei-xiang Sha Guo-Jun Cheng Zi-Yue xuan Yang Liu Wei-Hua Liu Xiao-Dong Zhang Zhong-feng Tang School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232000China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of TechnologyHarbin 150001China University of Chinese Academy of Sciences Beijing 100049China

Electron spin resonance techniques were employed to investigate the effects of the absorbed dose and post-irradiation conditions on the evolution and decay of free-radicals in cross-linked polytetrafluoroethylene(XPTFE),induced byγ-ray ***-end free-radicals,chain alkyl free-radicals,and tertiary alkyl free-radicals were detected when XPTFE was irradiated under Ar *** corresponding peroxy free-radicals were formed upon exposure of irradiated XPTFE to air;the freeradicals concentration first increased linearly with increasing absorbed dose and then gradually *** free-radicals yield under air atmosphere was greater than that under Ar,and the peroxy free-radicals were preserved for a relatively long time when irradiated XPTFE was stored under air *** chain alkyl free-radicals may be converted to chain end free-radicals byβ-scission,while chain end free-radicals are more sensitive to oxygen than chain alkyl *** the annealing temperature was raised above the a-transition temperature of XPTFE,the decay of the free-radicals was greatly affected and accelerated by the motion of the molecules over the long range.

关键词： Polytetrafluoroethylene Cross-linked polytetrafluoroethylene Electron spinresonance Decay Radiation c-ray

Synthesis of nanofluids composed of deep eutectic solvents and metal-modified MCM-41 particles as multifunctional promoters for fuel oil desulfurization

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1776-1787页

作者： Jing-xuan Zhang xuan Wang Yan-Ru feng Jia-Yu An Yu-xuan Chi Ya-Tai Liu Ling-Fei Zhang Yun-Bo Zhao xiang-feng Zeng Zi-Bo Wang Jia-Shuai Liu Yi-Fan Wang Shuai-Yong Dou Er-Hong Duan Tao Meng School of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control Shijiazhuang 050018China College of Science Hebei Agricultural UniversityBaoding 071001China

Compared with traditional hydrodesulfurization,new nonhydrodesulfurization methods have the advantage of a high removal efficiency for thiophene compounds under mild ***,independent nonhydrodesulfurization technologies are faced with their own shortcomings,such as limitations of the desulfurization performance and regeneration of *** overcome these limitations,four nanofluids were prepared by dispersing different metal-modified MCM-41 particles in deep eutectic solvent as multifunctional promoters to develop a comprehensive desulfurization *** on the excellent adsorbability and high catalytic activity of the dispersed particles and the outstanding extractability of deep eutectic solvent in nanofluids,a high sulfur removal of 99.33%was achieved for model oil under mild conditions in 15 *** nanofluids also showed excellent reusability due to their high structural *** addition,NF@Cu/Al-MCM-41-2.5%exhibited the best desulfurization performance among the prepared *** result was obtained because the introduction of Al ions increased the number of acid sites and defect sites to improve the catalytic activity and adsorbability,and the best affinity of Cu/Al-MCM-41 for the deep eutectic solvent favored the reaction mass *** work opens the door to the development of a comprehensive nonhydrodesulfurization method based on the design of nanofluid materials.

关键词： fuel oil desulfurization nanofluids catalytic ozonation

Low complexity robust linear transceiver design for MIMO interference channel

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The Journal of China Universities of Posts and Telecommunications 2016年第6期23卷 76-81页

作者： Geng xuan Li Conggai Liu feng College of Information Engineering Shanghai Maritime University

This paper focuses on the linear transceiver design for multiple input multiple output（MIMO） interference channel（IC）, in which a bounded channel error model is assumed. Two optimization problems are formulated as minimizing maximum per-user mean square error（MSE） and sum MSE with the per-transmitter power constraint. Since these optimization problems are not jointly convex on their variable matrices, the transmitter and receiver can be optimized alternately respectively. For each matrix, an approximated approach is presented where the upper bound of constraint is derived so that it has less semidefinite, thus the problem can be viewed as second-order-cone programming（SOCP） and gets less computational complexity. Compared with the conventional S-procedure method, the proposed approach achieves similar performance, but reduces the complexity significantly, especially for the system with large scale number of antennas.

关键词： MIMO interference channel robust linear transceiver SOCP

Inhibition of cathepsin B protects pancreatic acinar cells against apoptosis in early pancreatic trauma in rats

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Emergency and Critical Care Medicine 2022年第1期2卷 7-11页

作者： Cong feng Lili Wang Jingyang Peng xiang Cui xuan Zhou Department of Emergency First Medical Center of Chinese PLA General HospitalBeijingChina Department of General Medicine First Medical Center of Chinese PLA General HospitalBeijingChina Department of Radiology First Medical CenterGeneral Hospital of the PLABeijingChina Department of Orthopedics Fourth Medical CenterGeneral Hospital of the PLABeijingChina Department of Emergency Hainan Hospital of Chinese PLA General HospitalSanyaChina

Objectives:To observe the protective effect of cathepsin B inhibition against apoptosis of acinar cells in the early management of pancreatic contusion and laceration in rats,which would provide evidence of a potential early therapeutic for pancreatic contusion and ***:Twenty-four rats were assigned to 2 groups:1)Model(n=12)with an induced pancreatic injury of severity I-II and 2)CA074-V(n=12):an induced pancreatic injury,severity I-II treated with the cathepsin B inhibitor CA074-me(0.01mg/g)by intravenous administration through the caudal vein at 5minutes post model *** mice in these two groups were further randomly divided into 4 subgroups containing 3 rats each that were sacrificed for quantitation of apoptosis,immunohistochemistry of cathepsin B,and serum amylase and lipase measurements at different time points after model establishment(0,3,6,and 12hours).Results:The percentage of apoptotic pancreatic acinar cells collected from the injured tissues were much lower in the CA074-V group than the Model group at 3hours[9.25±3.94%vs.64.76±26.47%,P<0.10]and 6hours[14.71±8.22%vs.66.60±13.54%,P<0.10]post model *** percentage of cathepsin B-positive pancreatic acinar cells were much lower in the CA074-V group than in the Model group at 3hours[31.07±12.02%vs.69.16±5.71%,P<0.10],6hours[24.84±0.93%vs.47.06±0.91%,P<0.10],and 12hours[28.33±9.14%vs.52.72±1.25%,P<0.10]post model ***:Early cathepsin B inhibition effectively blocked acinar cell apoptosis in an experimental rat model of pancreatic contusion and laceration.

关键词： Acinar cell Apoptosis Cathepsin B inhibition Pancreatic contusion and laceration

Longitudinal changes in body weight of breastfeeding mothers in the first year after delivery and its relationship with human milk composition:a combined longitudinal and cross-sectional cohort study

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Food Science and Human Wellness 2024年第1期13卷 254-264页

作者： Huijuan Ruan Yajie Zhang Qingya Tang xuan Zhao Xuelin Zhao Yi xiang Wei Geng Yi feng Wei Cai Department of Clinical Nutrition Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition Shanghai Institute of Pediatric ResearchShanghai 200092China Department of Pediatric Surgery Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China

Objective:Postpartum weight retention(PPWR)is a common problem among women after *** main objectives of this study are to understand the changes in body weight of breastfeeding mothers during long-term follow-up and preliminarily explore the relationship between maternal body weight and human milk composition,including macronutrients,leptin,and ***:The study included a longitudinal cohort(122 mothers),and a cross-sectional cohort(37 mothers).The human milk,maternal weight,and dietary surveys were collected in the longitudinal cohort at different follow-up time points(1-14 days postpartum,2-4 months postpartum,5-7 months postpartum,and 12-17 months postpartum).The maternal body weight was analyzed using the responses in the survey questionnaires.A milk analyzer based on the mid-infrared spectroscopy(MIRS)was used to determine milk composition,and nutrition analysis software evaluated dietary *** the cross-sectional cohort,participating mothers were asked to provide blood and human milk samples and pertinent information related to maternal body *** body composition was measured by bioelectrical impedance analysis(BIA),while ELISA analyzed leptin and adiponectin in milk and ***:At 5-7 months postpartum,the PPWR of breastfeeding mothers was(2.46±3.59)*** 12-17 months postpartum,the PPWR was(0.98±4.06)*** was found to be negatively correlated with milk fat content within 14 days postpartum and positively correlated at 2-4 months *** addition,the maternal weight and body muscle mass were positively correlated with leptin and adiponectin in *** leptin was positively correlated with the mother’s body weight,body mass index(BMI),FAT percentage,and body fat mass,while plasma adiponectin did not correlate with any *** results also indicate that the PPWR did not correlate with leptin and adiponectin in plasma or ***:Breastfeeding mothers may retain considerable weight gai

关键词： Human milk Milk composition Body weight Body mass index(BMI) Weight gain Postpartum weight retention

Outage analysis of ANC in the FDD two-way fading channel with channel estimation error

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The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 12-18页

作者： GENG xuan LIU feng HE Chen College of Information Engineering Shanghai Maritime University School of Electronic Information and Electrical Engineering Shanghai Jiaotong University

This paper considers a frequency-division duplex （FDD） two-way channel with channel estimation error, where channel gains are independent of each other. It derives the exact closed-form outage probability expressions in the FDD system with analog network coding （ANC） by use of probability theory. To provide more insights, an approximated version for the exact outage probability is also developed in the medium-to-high signal-to-noise ratio （SNR） region. The simulation results show that the derived exact outage probabilities match the results of Monte Carlo simulations in all SNR regions, while the approximated outage probabilities also approach the simulation results when the channel condition is good. It is interesting that ANC in the FDD two-way channel is proved to outperform that of in the time-division duplex （TDD） channel by the computer simulation.

关键词： FDD outage probability two-way channel ANC