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A novel two-stage partial-nitritation/anammox (PN/A) process based on zeolite biological fixed bed reactor for low-strength ammonium wastewater treatment

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IOP Conference Series: Earth and Environmental Science 2021年第1期787卷

作者： Xiaoyang Gu xuwen zheng Yongxing Chen zhenguo Chen Qingbo Meng Hualu Environmental Technology Co. Ltd. Guangzhou 510700 China School of Environment and Energy South China University of Technology Guangzhou 510006 China School of Chemistry and Chemical Engineering South China University of Technology 510641 China Institute of Resources Comprehensive Utilization Guangdong Academy of Sciences Guangzhou 510650 China

A novel two-stage partial nitritation/anammox (PN/A) process coupled by a zeolite biological fixed bed reactor (ZBFB) and an anammox reactor were proposed for wastewater containing 30 mg/L NH4+-N by long-term operation. The cycle operational results by adsorption and biological desorption in ZBFB showed adsorption effluent NH4+-N maintained at 3.0-4.0 mg/L and the average biological desorption effluent NO2--N was 42.2 mg/L. In ZBFB, free ammonia inhibition on nitrite oxidizing bacteria was the main reason for stable nitrite accumulation performance with nitrite accumulation ratio as 88.70% during biological desorption step. Total nitrogen in the mixture of influent and biological desorption effluent of ZBFB could be removed to less than 15 mg/L by the subsequent anammox reactor. High-throughput sequencing analysis results presented the enrichment of Nitrosomonas and inhibition of Nitrobactor and Nitrospira in ZBFB, and dominance of Candidatua Kuenenia in anammox reactor. All results revealed desirable feasibility for nitrogen removal from low-strength ammonium wastewater by ZBFB combined with anammox reactor.

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Physical information-enhanced graph neural network for predicting phase separation

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Chinese Physics B 2024年第7期33卷 278-283页

作者：张亚强王煦文王雅楠郑文 Institute of Public-Safety and Big Data College of Computer Science and Technology(College of Data Science)Taiyuan University of TechnologyJinzhong 030600China Shanxi Engineering Research Centre for Intelligent Data Assisted Treatment Changzhi Medical CollegeChangzhi 046000China Innovation Academy for Microsatellites of Chinese Academy of Sciences Shanghai 200050China

Although phase separation is a ubiquitous phenomenon, the interactions between multiple components make it difficult to accurately model and predict. In recent years, machine learning has been widely used in physics simulations. Here,we present a physical information-enhanced graph neural network(PIENet) to simulate and predict the evolution of phase separation. The accuracy of our model in predicting particle positions is improved by 40.3% and 51.77% compared with CNN and SVM respectively. Moreover, we design an order parameter based on local density to measure the evolution of phase separation and analyze the systematic changes with different repulsion coefficients and different Schmidt *** results demonstrate that our model can achieve long-term accurate predictions of order parameters without requiring complex handcrafted features. These results prove that graph neural networks can become new tools and methods for predicting the structure and properties of complex physical systems.

关键词： graph neural network phase separation machine learning dissipative particle dynamics

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A low-temperature process for lithium extraction from lithium-bearing mineral: Conversion behavior and mechanisms

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SEPARATION AND PURIFICATION TECHNOLOGY 2025年 357卷

作者： Luo, Shaojun zheng, Xiaohong Liu, Haichao Zhang, Qing He, Mingming Wang, Yuehai He, xuwen Sun, Zhi China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China Chinese Acad Sci Inst Proc Engn Natl Engn Res Ctr Green Recycling Strateg Met Res Beijing 100190 Peoples R China China Univ Geosci Beijing Sch Mat Sci & Technol Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol Natl Lab Mineral Mat Beijing 100083 Peoples R China Shanghai Polytech Univ 2360 Jinhai Rd Shanghai 201209 Peoples R China

Lithium extraction from lithium-bearing clay mineral (LiBC) has received significant attention due to the increasing demand of lithium for the advanced renewable energy industry. However, the low contents of valuable elements and stable physiochemical properties of LiBC result in high energy consumption and low efficiency in extracting lithium from LiBC. This study demonstrates a low-temperature strategy using (NH4)2SO4 as an additive to effectively extract lithium from LiBC. In details, the thermodynamic analysis verifies that Li, Al, and Fe can be converted to sulfates at 250-450 degrees C during thermal treatment, indicating the possibility for extraction of Li under low-temperature conditions. Subsequently, the leaching behavior of lithium under different roasting temperatures and water leaching conditions was investigated. The results show that 83.43 % of Li can be extracted under optimized conditions. The mechanism study was carried out through a number of characterization techniques including 3D microscope, TG-DSC, XRD, FTIR, and SEM. It reveals that formation of liquidus phase of molten salt is the key to achieve low-temperature roasting and transfer and reactions at the interface of molten salt and LiBC can be significantly enhanced that can easily breakdown the interlayer structures. Consequently, it offers distinct advantages, since the roasting temperature can be significantly decreased with minor impurity ions being leached into the solutions. This research therefore provides an efficient and environmentally friendly method for lithium extraction from minerals.

关键词： Lithium-bearing mineral Molten salt roasting Solid-liquid reaction Lithium Extraction Ammonium sulfate

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改进四帧差分运动目标检测算法的FPGA实现

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通信技术 2024年第11期57卷 1213-1220页

作者：严飞孟川郑绪文李楚刘银萍南京信息工程大学自动化学院江苏南京210044 江苏省大气环境与装备技术协同创新中心江苏南京210044 南京信息工程大学应急管理学院江苏南京210044

针对传统的帧间差分运动目标检测算法易出现虚假边缘及边缘缺失等现象,设计了一种改进的四帧差分运动目标检测系统,将图像边缘信息与四帧差分算法相融合对运动目标进行检测,并在现场可编程门阵列(Field Programmable Gate Array,FPGA)... 详细信息

针对传统的帧间差分运动目标检测算法易出现虚假边缘及边缘缺失等现象,设计了一种改进的四帧差分运动目标检测系统,将图像边缘信息与四帧差分算法相融合对运动目标进行检测,并在现场可编程门阵列(Field Programmable Gate Array,FPGA)平台上构建了视频图像处理系统。该系统主要由图像采集模块、图像缓存模块、图像处理模块和图像显示模块4个部分组成。通过OV5640摄像头采集1 024×768分辨率的图像数据,将采集的图像数据存入DDR3中,并采用改进的四帧差分算法对运动目标进行检测与标记,最终传输至高清多媒体接口(High-Definition Multimedia Interface,HDMI)外接显示器实时输出结果。实验结果表明,该系统可以准确检测出摄像头采集的视频源中的多个运动目标,并满足实时检测要求。

关键词：改进四帧差分 FPGA 边缘检测 DDR3 多运动目标检测

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The histone deacetylase inhibitor SAHA exerts a protective effect against myocardial ischemia/reperfusion injury by inhibiting sodium-calcium exchanger

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BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 2023年第1期671卷 105-115页

作者： Shi, Xiaocui Yin, Yajuan Guo, xuwen Liu, Mei Ma, Fangfang Tian, Li zheng, Mingqi Liu, Gang Hebei Med Univ Hosp 1 Hebei Key Lab Cardiac Injury Repair Mech Study Hebei Int Joint Res Ctr Struct Heart DisDept Card Shijiazhuang 050000 Peoples R China Hebei Med Univ Hosp 1 Dept Cardiol Hebei Key Lab Heart & Metab Shijiazhuang 050000 Hebei Peoples R China

Calcium overload performs a crucial function in the pathogenesis of myocardial ischemia-reperfusion (I/ R) damage, which contributes to mitochondrial impairment and apoptosis of cardiomyocytes. Sub-eroylanilide hydroxamic acid (SAHA), a small molecule histone deacetylases inhibitor with modulatory capacity on Na+-Ca2+ exchanger (NCX), is proven to have protective potential towards cardiac remod-eling and injury, but the mechanism remains unclear. Hence, Hence, our present research explored the modulation of NCX-Ca2+-CaMKII by SAHA in myocardial I/R damage. Our outcomes indicate that in vitro hypoxia and reoxygenation models of myocardial cells, SAHA treatment inhibited the increase in expression of NCX1, intracellular Ca2+ concentration, expression of CaMKII and self-phosphorylated CaMKII, and cell apoptosis. In addition, SAHA treatment improved myocardial cell mitochondrial swelling inhibited mitochondrial membrane potential diminution and the openness of the mitochondrial permeability transition pore, and protected against mitochondrial dysfunction following I/R injury. In vivo, SAHA treatment alleviated the decrease in FS% and EF%, the increase in the myocardial infarct area, and myocardial enzyme levels caused by I/R injury, while also reducing myocardial cell apoptosis, and inhibiting mitochondrial fission and mitochondrial membrane rupture. These results indicated that SAHA treatment alleviated myocardial cell apoptosis as well as mitochondrial dysfunction resulting from myocardial I/R impairment, and contributed to myocardial function recovery by inhibiting the NCX-Ca2+- CaMKII pathway. These findings offered additional theoretical support to explore the mechanism of SAHA as a therapeutic agent in cardiac I/R damage and develop new treatment strategies. (c) 2023 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Myocardial ischemia/reperfusion Na+ -Ca2+ exchanger Histone deacetylase inhibitor CaMKII

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The catalytic thermal decomposition of ammonium perchlorate on CuMxOy (M = Fe, Ni, Co and Zn) catalysts and their applications in solid propellant

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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2023年第13期148卷 6013-6026页

作者： Hu, Yinghui Wang, xuwen Hao, Jingwei Jiang, Shouhang Zhang, Jian Yang, Yulin Lin, Kaifeng zheng, Jian Shuai, Yong Harbin Inst Technol Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers & Harbin 150001 Peoples R China Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China China Aerosp Sci & Technol Corp 16 Fucheng Rd Beijing 100048 Peoples R China

The excellent thermal decomposition efficiency of ammonium perchlorate (AP) is of great importance for obtaining propellant with fast specific impulse. In this study, four CuMxOy catalysts, including M = Fe, Ni, Co, and Zn, were synthesized and then used for catalyzing AP decomposition and hydroxyl-terminated polybutadiene (HTPB)-based solid propellant combustion. The existed synergistic effect in CuMxOy catalysts improved the catalytic activity and the most active CuZnO catalyst decreased the AP high-temperature decomposition temperature (HTD) from 412.5 to 289.4 ?. Kinetic studies indicated that CuMxOy catalysts inhibited the conversion of N2O to a fully oxidized product and decreased the activation energy (E-a) in HTD to concentrate AP decomposition to significantly decrease the heat loss, thereby increasing their decomposition efficiency. When applying the CuMxOy catalysts in the HTPB (hydroxyl-terminated polybutadiene)-based solid propellant, a faster burning rate and stronger optical emission spectrum were obtained. The CuMxOy catalyst is a potential additive for the preparation of outstanding combustion solid propellants.

关键词： Bimetal oxide catalyst Ammonium perchlorate Thermal decomposition Catalytic mechanism Burning rate

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沸石强化SBR处理印染丝光高氨氮废水

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水处理技术 2020年第9期46卷 98-103页

作者：周松伟汪晓军郑旭文陈振国陈浩川华南理工大学环境与能源学院工业聚集区污染控制与生态修复教育部重点实验室广东广州510006 佛山市化尔铵生物科技有限公司广东佛山528300 华南理工大学化学与化工学院广东广州510641

以印染丝光高氨氮含量废水为研究对象,利用投加天然沸石粉的序批式活性污泥法反应器(ZSBR)实现高氨氮废水的亚硝化。结果表明,通过沸石对氨氮的吸附-解吸作用可以维持反应器内适宜的游离氨(FA)含量,从而实现ZSBR亚硝化的快速启动。系统... 详细信息

以印染丝光高氨氮含量废水为研究对象,利用投加天然沸石粉的序批式活性污泥法反应器(ZSBR)实现高氨氮废水的亚硝化。结果表明,通过沸石对氨氮的吸附-解吸作用可以维持反应器内适宜的游离氨(FA)含量,从而实现ZSBR亚硝化的快速启动。系统在受到高含量FA的抑制作用后,通过控制进水氮负荷调控系统内较低的FA来恢复ZSBR的亚硝化。高通量测序分析表明,ZSBR内氨氧化菌(AOB)得到了快速增殖,而硝化菌(NOB)受到抑制被淘洗。对于高氨氮的丝光废水,通过改变充水比(单周期内进水体积与ZSBR总有效体积之比)控制进水氮负荷在合理的范围内,系统依然可以稳定运行,且最高氨氮转化去除负荷可达1.12 kg/(m^3·d)。

关键词：丝光废水沸石 SBR 游离氨亚硝化

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Study on Flow Behavior and Adsorption Characteristics of Encapsulated Polymer Particles

Study on Flow Behavior and Adsorption Characteristics of Enc...

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2025 International Petroleum Technology Conference, IPTC 2025

作者： Liu, Yongsheng Wei, Bei Hou, Jian zheng, Ningyu Qin, xuwen Zhang, Yang Guo, Zhixin Zhang, Dequan National Key Laboratory of Deep Oil and Gas China University of Petroleum East China Shandong Qingdao China School of Petroleum Engineering China University of Petroleum East China Shandong Qingdao China

ISBN: (纸本)9781959025436

Encapsulated polymer refers to Micro/Nano-scale particles with polymer as the core, which can release the polymer to achieve thickening. Encapsulated polymer flooding is a new type of deep profile control technology suitable for further improving the oil recovery of conventional reservoirs. However, the adsorption and temporary blockage behaviors of encapsulated polymer particles in porous media significantly affect the accurate description of their targeted viscosity enhancement. On this account, we investigated how encapsulated polymer particles adsorb and temporarily block. Using PDMS material microfluidic chips, we investigated the flow behavior of encapsulated polymer in seven different pore throat structures. High-precision pressure sensors and microscopes were employed to real-time capture microscopic flow images of microcapsule particles inside single micro-channels and observe pressure fluctuation characteristics. Based on particle image velocimetry (PIV) systems, we studied the diverting fluid behavior in parallel micro-channels with different width ratios. Building on this, we conducted dynamic adsorption experiments to quantitatively characterize the adsorption and retention behavior of encapsulated polymer particles in porous media. In this study, we observed four phenomena of free flow, surface adsorption, blockage, and multi-particle aggregation slug flow during the flow of encapsulated polymer particles in a single microchannel. In parallel microchannels, the capsule particles exhibited selectivity towards flow paths, primarily entering wider throats. With the increase of the width ratio, the encapsulated polymer particles in the narrow throat are more confined and are more likely to accumulate in the throat and cause blockage. Experiments in porous media show that the adsorption and retention of capsule particles are inversely proportional to the permeability. The particles are more inclined to flow along the high permeability dominant channel. The

关键词： Microfluidics

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Conventional dendritic cells 2, the targeted antigen-presenting-cell, induces enhanced type 1 immune responses in mice immunized with CVC1302 in oil formulation

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IMMUNOLOGY LETTERS 2024年 267卷 106856-106856页

作者： Du, Luping Lu, Haiyan Qiao, xuwen Zhang, Yuanpeng Hou, Liting Yu, Xiaoming Cheng, Haiwei Chen, Jin zheng, Qisheng Hou, Jibo Tong, Guangzhi Jiangsu Acad Agr Sci Inst Vet Immunol & Engn Nanjing 210014 Jiangsu Peoples R China Jiangsu Acad Agr Sci Natl Res Ctr Engn & Technol Vet Biol Nanjing 210014 Jiangsu Peoples R China Minist Sci & Technol Nanjing Jiangsu Key Lab Food Qual & Safety State Key Lab Cultivat Base Nanjing 210014 Jiangsu Peoples R China Chinese Acad Agr Sci Shanghai Vet Res Inst Shanghai 200241 Peoples R China Nanjing Agr Univ Coll Vet Med Nanjing 210095 Jiangsu Peoples R China Jiangsu Acad Agr Sci 45 Zhongling StRoom A111 Nanjing Jiangsu Peoples R China

Multifunctional CD4+ T helper 1 (Th1) cells, producing IFN-gamma, TNF-alpha and IL-2, define a correlate of vaccinemediated protection against intracellular infection. In our previous study, we found that CVC1302 in oil formulation promoted the differentiation of IFN-gamma+/TNF-alpha+/IL-2+Th1 cells. In order to extend the application of CVC1302 in oil formulation, this study aimed to elucidate the mechanism of action in improving the Th1 immune response. Considering the signals required for the differentiation of CD4+ T cells to Th1 cells, we detected the distribution of innate immune cells and the model antigen OVA-FITC in lymph node (LN), as well as the quantity of cytokines produced by the innate immune cells. The results of these experiments show that, cDC2 and OVAFITC localized to interfollicular region (IFR) of the draining lymph nodes, inflammatory monocytes localized to both IFR and T cell zone, which mainly infiltrate from the blood. In this inflammatory niche within LN, CD4+ T cells were attracted into IFR by CXCL10, secreted by inflammatory monocytes, then activated by cDC2, secreting IL-12. Above all, CVC1302 in oil formulation, on the one hand, targeted antigen and inflammatory monocytes into the LN IFR in order to attract CD4+ T cells, on the other hand, targeted cDC2 to produce IL-12 in order to promote optimal Th1 differentiation. The new finding will provide a blueprint for application of immunopotentiators in optimal formulations.

关键词： CVC1302 Oil formulation Interfollicular region Inflammatory niche Th1 cells

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Optimal Clearing Model of Centralized Market Considering Path Constraints 1

Optimal Clearing Model of Centralized Market Considering Pat...

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International Symposium on Energy Environment and Green Development (EEGD)

作者： zheng, Zhao Chen, Kening Jiang, Yu Liu, xuwen State Grid Energy Res Inst Beijing Peoples R China State Grid JiangSu Elect Power Co Ltd Nanjing Jiangsu Peoples R China

China's electricity market is now still in the mode of "Unified market and two-tier operation" including provincial and inter-provincial market. The inter-provincial market is divided into the medium and long-term market and spot market. This study takes the inter provincial spot market as the research object, and proposes a unified optimization clearing algorithm for inter provincial spot market considering path constraints. The proposed method is able to handle AC-DC hybrid electricity network, and sort and determine the trading pairs using power flow tracing algorithm. The power market software PLEXOS and practical market data are used to simulate the proposed model, and the results show the accuracy and effectiveness.

关键词： Power markets

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