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Revealing the effect of preparation parameters on zeolite adsorption performance for low and medium concentrations of ammonium

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Journal of Environmental Sciences 2019年第11期31卷 177-188页

作者： Wenyan He Hui gong Kuo Fang fei Peng Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084China School of Water Resources & Environment China University of Geosciences Beijing 100083 China

The effect of preparation parameters on the performance of zeolite for ammonium (20-300 mg N/L) adsorption from simulated wastewater is *** was found that the ratios of Na2O/SiO2 and Si/Al had a more important influence than crystallization time on zeolite adsorption *** low Na2O/SiO2 ratios were beneficial for fabrication of zeolites with high proportions of micropore area and volume,which led to the surface adsorption mechanism being dominated by surface free energy and pore ***,with decreasing Si/Al ratios,the effect of ion-exchange was more prominent due to the high negative surface potential of *** addition,the concentration of weak acid sites on the zeolites was increased with lower ratios of Na2O/SiO2 and Si/Al,which may promote ammonium ***,the most effective zeolite for ammonium removal,which was fabricated at Na2O/SiO2 =1.375,Si/Al =4 and crystallization time of 48 hr,exhibited the cooperative effects of adsorption,ion-exchange and a large amount of weak acid *** maximum ammonium adsorption capacity (35.06 t 0.98 mg/g) and the removal efficiency (94.44%± 4.00%) were obtained at the dosage of 4.0 g/L zeolite NaX at ammonium concentrations of 300 mg N/L and 20 mg N/L,*** Freundlich isotherm and pseudo-first-order kinetics models provided excellent fitting for the ammonium adsorption *** addition,zeolite NaX showed about 1.23-3.2 times the ammonium adsorption capacity of *** stable and efficient reusability of zeolite NaX after five regeneration cycles demonstrated that this adsorbent has considerable potential for practical industrial applications.

关键词： Zeolite synthesis Ammonium nitrogen removal Ion exchange Performance optimization

建设健康社会的催化剂:健康社会工作者与全科医生在基层的合作

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中国全科医学 2025年第4期28卷 516-520页

作者：李奕桦赵艾杨曾飞方雪张旺王欣武汉大学中南医院创伤与显微骨科湖北省武汉市430071 巴东县人民医院骨科湖北省恩施土家族苗族自治州444300

以“健康中国”战略为导向,从优势互补专业知识、共同连接医院社区、拓展研究社会健康三个方面去探讨健康社会工作者与全科医生在基层卫生环境中的合作价值,尤其在完善公共卫生应急体系和构建医联体上,健康社会工作者与全科医生的合作... 详细信息

以“健康中国”战略为导向,从优势互补专业知识、共同连接医院社区、拓展研究社会健康三个方面去探讨健康社会工作者与全科医生在基层卫生环境中的合作价值,尤其在完善公共卫生应急体系和构建医联体上,健康社会工作者与全科医生的合作可以发挥必不可少的作用,能有效推动健康社会的建设进程。同时文章也指明了目前健康社会工作面临的主要挑战,并提出相应的对策。

关键词：健康社会健康社会工作者全科医生基层卫生公共卫生应急医联体

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Assessment of tomographic window and sampling rate efects on GNSS water vapor tomography

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Satellite Navigation 2023年第1期4卷 155-166,I0005页

作者： fei Yang Yilin Sun Xiaolin Meng Jiming Guo Xu gong College of Geoscience and Surveying Engineering China University of Mining and Technology-BeijingBeijing 100083China College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 100124China School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China

The ground-based Global Navigation Satellite System(GNSS)water vapor tomography is increasingly important in GNSS *** the multi-GNSS and more ground-based GNSS sites can be incorporated into the regional water vapor tomographic model,determining the tomographic window and sampling rate is crucial for the modelling of the water vapor *** two factors afect not only the number of available signal rays from the satellites,but also the number of tomographic voxels crossed by the signal *** study uses Hong Kong as the research area to explore the impact of 12 schemes with diferent tomographic window and sampling rate on the three water vapor tomography methods,including Least squares,Kalman fltering,and Multiplicative Algebraic Reconstruction Technique(MART).Numerical results show that the tomographic results with the three methods get better as the width of the tomographic window decreases and the sampling rate increases in these 12 schemes,and it is found that the Least squares method is most afected by the two factors,followed by Kalman fltering and MART *** is recommended to set a tomographic window width of 10 min and a sampling rate of 300 s in a GNSS water vapor tomographic experiment with dense GNSS site like Hong Kong.

关键词： GNSS meteorology Water vapor Tomography

ChatGPT Chats on Computational Experiments:From Interactive Intelligence to Imaginative Intelligence for Design of Artificial Societies and Optimization of Foundational Models

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IEEE/CAA Journal of Automatica Sinica 2023年第6期10卷 1357-1360页

作者： Xiao xue Xiangning Yu fei-Yue Wang College of Intelligence and Computing Tianjin UniversityTianjin 300350China State Key Laboratory for Management and Control of Complex Systems the Institute of Automdtion of Chinese Academg of SciencesBeijing 100190China

POWERED by the rapid development of Internet,the penetration of the Internet of Things,the emergence of big data,and the rise of social media,more and more complex systems are exhibiting the characteristics of social,physical,and information *** systems are known as cyber-physicalsocial systems(CPSS)[1],[2].These CPSS face unprecedented challenges in design,analysis,management,control and integration due to their involvement with human and social factors[3],[4].To cope with this challenge,there are two main approaches to CPSS research.

关键词： Intelligence Foundation involvement

Oxidation behavior of low-grade vanadiferous titanomagnetite concentrate with high titanium

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Journal of Iron and Steel Research International 2024年第2期31卷 329-341页

作者： Jin-sheng Liu Zhen-xing Xing gong-jin Cheng xue-yong Ding Xiang-xin xue School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Liaoning Key Laboratory of Recycling Science for Metallurgical Resources Shenyang110819LiaoningChina Innovation Research Institute of Vanadium and Titanium Resource Industry Technology Northeastern UniversityShenyang110819LiaoningChina

In order to clarify the oxidation mechanisms and make better use of the low-grade vanadiferous titanomagnetite concentrate with high titanium(LVTC),the oxidation behavior of LVTC was *** results showed that oxidation degree was achieved within 90 min when temperature was not lower than 700°C,and the main phases of the oxidized LVTC consisted of Fe9TiO15,Fe2O3,CaSiTiO5 and a small amount of *** temperature is favorable to the formation of *** surface of LVTC gradually becomes rough,with fine particles of needle-like and granular shape appearing on the surface,which finally turn from laminar to creamy,spread out,and are interspersed with many tiny *** phase oxidation paths in LVTC were as follows:(1)Fe2.75Ti0.25O4→Fe9TiO15+Fe2O3;(2)Fe2.75Ti0.25O4→Fe2O3+FeTiO3→Fe2TiO5;(3)FeTiO3→Fe2O3+Fe2Ti3O9→*** is predominantly mesoporous whether oxidized or not,with the pores mainly distributed in the range of 2–40 nm,and the specific surface area of LVTC decreases significantly with increasing temperature.

关键词： Low-grade vanadiferous titanomagnetite concentrate Oxidation degree Phase transformation Micromorphology Oxidation path Pore structure

Ultrafast Joule heating synthesis of hierarchically porous graphene-based Co-N-C single-atom monoliths

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Nano Research 2022年第5期15卷 3913-3919页

作者： Lingli Xing Rui Liu Zhichao gong Jingjing Liu Jianbin Liu Haisheng gong Kang Huang Huilong fei Advanced Catalytic Engineering Research Center of the Ministry of Education State Key Laboratory for Chemo/Biosensing and Chemometricsand College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Herein,we develop a transient heating-quenching strategy triggered by Joule heating for the synthesis of single-atom cobalt-and nitrogen-doped graphene materials with three-dimensional porous monolithic architecture(denoted as CoNG-JH).The ultrafast Joule heating procedure simultaneously enables the reduction of graphene oxide and the incorporation of metal and nitrogen atoms into the graphene matrix within 2-second ***,the transient quenching avoids the extended heating-induced atom aggregation,ensuring the rapid and stable dispersion of atomic-scale CoNx active sites in ***,the interconnected macropores and nanopores formed by the self-assembly of graphene sheets facilitate the unimpeded ion and gas transport during the catalytic *** used as an electrode for the hydrogen evolution reaction(HER),the fabricated free-standing CoNG-JH exhibits high catalytic activity and durability with a low overpotential of 106 mV at 10 mA·cm^(-2) and a small Tafel slope of 66 mV·dec^(-1) in 0.5 M H_(2)SO_(4) *** presented synthesis and design strategy open up a rapid and facile route for the manufacturing of single atom catalysts.

关键词： Joule heating single atom catalysts hierarchically porous structure self-supporting film hydrogen evolution reaction

Energy Minimization for Heterogenous Traffic Coexistence with Puncturing in Mobile Edge Computing-Based Industrial Internet of Things

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China Communications 2024年第10期21卷 167-180页

作者： Wang xue Wang Ying fei Zixuan Zhao Junwei School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Networking and Switching Technology Beijing 100876China

Puncturing has been recognized as a promising technology to cope with the coexistence problem of enhanced mobile broadband(eMBB) and ultra-reliable low latency communications(URLLC)traffic. However, the steady performance of eMBB traffic while meeting the requirements of URLLC traffic with puncturing is a major challenge in some realistic scenarios. In this paper, we pay attention to the timely and energy-efficient processing for eMBB traffic in the industrial Internet of Things(IIoT), where mobile edge computing(MEC) is employed for data processing. Specifically, the performance of eMBB traffic and URLLC traffic in a MEC-based IIoT system is ensured by setting the threshold of tolerable delay and outage probability, respectively. Furthermore,considering the limited energy supply, an energy minimization problem of eMBB device is formulated under the above constraints, by jointly optimizing the resource blocks(RBs) punctured by URLLC traffic, data offloading and transmit power of eMBB device. With Markov's inequality, the problem is reformulated by transforming the probabilistic outage constraint into a deterministic constraint. Meanwhile, an iterative energy minimization algorithm(IEMA) is *** results demonstrate that our algorithm has a significant reduction in the energy consumption for eMBB device and achieves a better overall effect compared to several benchmarks.

关键词： energy minimization enhanced mobile broadband(eMBB)and ultra-reliable low latency communications(URLLC)coexistence industrial Internet of Things(IIoT) mobile edge computing(MEC) puncturing

Mobile Content Distribution with Vehicular Cloud in Urban VANETs

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China Communications 2016年第8期13卷 84-96页

作者： Haigang gong Lingfei Yu Nianbo Liu xue Zhang School of Computer Science and Engineering University of Electronic Science and Technology of China Big Data Research Center of UESTC University of Electronic Science and Technology of China Hangzhou College of Commerce Zhejiang Gongshang University

Plenty of multimedia contents such as traffic images, surveillance video, music and movie will flood into vehicular ad hoc networks. However, content distribution over VANETs is not a easy task, due to the high mobility of vehicles and intermittent connectivity. Infrastructure-based scheme can relieve the problem, but with a large amount of investment. In this paper, we propose a mobile content distribution scheme based on roadside parking cloud(RPC), which is formed by the parked car on the roadside, and mobile cloud(MC), which is formed by moving cars on the road. According to a trip history model, a mobile car can estimate its following trajectory. When it wants to download the content, gateway node of the RPC will work out a downloading schedule, which tells it how much chunks it can download from which RPCs. Moreover, the helper of the mobile car in mobile cloud would deliver specified chunks to it when there is lack of RPC in the following trip. Simulation results show that cloud-based scheme performs better than inter-vehicle communication approach and cluster-based scheme.

关键词： roadside parking cloud mobile cloud trip history model trajectory prediction content distribution

Surface pits stabilized Au catalyst for low-temperature CO oxidation

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Rare Metals 2022年第9期41卷 3060-3068页

作者： Ya-Feng Cai Chen fei Cheng Zhang Jie Yang Li Wang Wang-Cheng Zhan Yang-Long Guo Xiao-Ming Cao xue-Qing gong Yun Guo Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

Development of active and stable catalysts for low-temperature CO oxidation has long been regarded as a hot *** this contribution,we used CeO_(2) with high-density surface pits as support to prepare an active and stable Au/CeO_(2) catalyst by an adsorption-deposition *** obtained 0.05 wt%Au/CeO_(2)-TD(where TD represents thermal decomposition)can maintain its activity at 80℃ for more than 20 h or even after calcination at 800℃ for 2 *** characterization results showed that the high-density surface pits on CeO_(2)-TD play a decisive role in the stabilization of Au and enhancement of the redox *** work may provide a new strategy to improve the stability of supported metal catalysts by a simple and conventional method.

关键词： Au catalyst CeO_(2) Surface defect Stability CO oxidation