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Numerical investigation on dynamic response of the screen mesh in vibrating screening through DEM-FEM co-simulation

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Particuology 2024年第4期87卷 205-217页

作者： huan Zhang Xiao zheng Weimin Jing Key Laboratory of MetallurgicalEquipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan430081 China Hubei Key Laboratory of Mechanical Transmssion and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan430081China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing400044China

Dynamic response of the screen mesh is of great significance in the optimum vibrating screen *** this paper,based on the DEM-FEM co-simulation method,the effect of screening parameters on the dynamic response of the screen mesh is explored and the mechanism is revealed on the particle ***,a virtual experiment on a linear vibrating screen was carried out to analyze the screening pa-rameters'effect with both impact load and sustained stress inflicted on the screen ***,the time-domain evolution regularity of the screen mesh LVA(Local Vibration Amplitude)under different particle plugging conditions was investigated based on the ***,the influence of screening parameters on LVA and its distribution was *** results show that the screening parameters can greatly affect the screen mesh LVA and its distribution by changing the movement of the granular material and the particle penetration probability,which provides an important basis for the optimal design of the screen mesh and its supporting structure.

关键词： Vibrating screen Dynamic response DEM-FEM Screening parameters Local vibration amplitude

一株同步硝化反硝化菌株的筛选及其生物电化学脱氮性能研究

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南京农业大学学报 2025年第1期48卷 133-143页

作者：田瑞瑞付欢郑云黄新琦周俊雍晓雨南京工业大学生物与制药工程学院江苏南京211816 南京师范大学地理科学学院江苏南京210023

[目的]本文旨在获得具有高效脱氮性能的异养硝化-好氧反硝化(heterotrophic nitrification-aerobic denitrification,HN-AD)功能菌株,构建生物电化学-同步硝化反硝化(bio-electrochemical systems-simultaneous nitrification and denitrification,BES-SND)耦合系统,实现脱氮效率的提升。[方法]从活性污泥中筛选HN-AD菌株,鉴定后通过摇瓶试验分析其脱氮性能。然后进一步研究碳源、C/N、溶解氧等外界因素对菌株同步硝化反硝化性能的影响。将菌株接种到微生物燃料电池(microbial fuel cells,MFC)的生物阴极,分析低C/N条件下BES-SND体系的脱氮性能。[结果]从活性污泥中筛选出一株具有同步硝化反硝化性能的HN-AD菌株,命名为Alcaligenes aquatilis N3。确定该菌株发生SND反应的最适碳源为乙酸钠、C/N值为20、溶解氧为3.70 mg·L^(-1)。在BES-SND脱氮体系中,C/N值分别为2、4、6、8时,菌株*** N3的总氮去除率分别为20.51%、26.67%、37.76%和48.50%。在C/N=2的试验条件下,BES-SND系统的总氮去除速率在第5天仍为1.79 mg·L^(-1)·d^(-1)。[结论]在低碳环境下,*** N3菌株依然可以在BES-SND耦合脱氮体系中实现脱氮,降低了脱氮过程对碳源的依赖性,具有一定的实际环境应用潜力。

关键词：同步硝化反硝化异养硝化-好氧反硝化生物电化学低C/N值微生物燃料电池

Effect of neutrophil CD64 for diagnosing sepsis in emergency department

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World Journal of Emergency Medicine 2020年第2期11卷 79-86页

作者： Wen-peng Yin Jia-bao Li Xiao-fang zheng Le An huan Shao Chun-sheng Li Department of Emergency Medicine Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China

BACKGROUND:The aim of this study is to investigate the diagnostic and prognostic value of neutrophil CD64(nCD64)as a novel biomarker in sepsis ***:One hundred fifty-one adult patients diagnosed with sepsis and 20 age-matched healthy controls were enrolled in the *** with sepsis were further subdivided into a sepsis group and a septic shock ***64 expression,serum procalcitonin(PCT)level,C-reactive protein(CRP)level,and white blood cell(WBC)count were obtained for each patient,and Sequential Organ Failure Assessment(SOFA)scores were ***:nCD64 expression was higher in the sepsis group with confirmed infection than in the control *** receiver operating characteristic(ROC)curve of nCD64 was higher than those of SOFA score,PCT,CRP and WBC for diagnosing *** area under the curve(AUC)of nCD64 combined with SOFA score was the highest for all *** AUC of nCD64 for predicting 28-day mortality in sepsis was signifi cantly higher than those of PCT,CRP,and WBC,but slightly lower than that of SOFA *** AUC of nCD64 or PCT combined with SOFA score was signifi cantly higher than that of any single parameter for predicting 28-day ***:nCD64 expression and SOFA score are valuable parameters for early diagnosis of infection and prognostic evaluation of sepsis patients.

关键词： Neutrophil CD64 Sepsis Sequential Organ Failure Assessment score Procalcitonin Prognosis Biomarker

Wet-spinning of Regenerated Silk Fiber from Aqueous Silk Fibroin Solutions: Influence of Calcium Ion Addition in Spinning Dope on the Performance of Regenerated Silk Fiber

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Chinese Journal of Polymer Science 2014年第1期32卷 29-34页

作者： huan Zhou zheng-zhong Shao 陈新 State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Laboratory of Advanced Materials Fudan University

Ca（II） ions are added in the spinning dope to adjust the solidification rate of regenerated silk fibroin （RSF） solution during the wet-spinning process since Ca（II） ions are proved to be favorable to maintain the stable silk fibroin network in our previous work. The results show that when Ca（II）/RSF ratios are 1/50 and 1/20, the resulted RSF fibers exhibit good performance with the breaking energy more than 70 kJ/kg. However, higher Ca（II）/RSF ratio （for example, 1/10） hinders the solidification of spinning dope and results in poor RSF fibers. These observations together with earlier papers from this laboratory confirm that to produce tough silk fibers the spinning conditions must allow sufficient time for the adjustment of silk fibroin molecular chains.

关键词： Silk fiber Natural polymer Wet-spinning Protein Calcium.

Bubble Tree ConVergence for the Harmonic Sequence of Harmonic Surfaces in CP^n

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Acta Mathematica Sinica,English Series 2010年第7期26卷 1277-1286页

作者： Xiao huan MO fang SUN Key Laboratory of Pure and Applied Mathematics School of Mathematical Sciences Peking University Beijing 100871 P. R. China

We show that any harmonic sequence determined by a harmonic map from a compact Riemannian surface M to CP^n has a terminating holomorphic （or anti-holomorphic） map from M to CP^n, or a ＂bubble tree limit＂ consisti... 详细信息

关键词： bubble tree harmonic sequence non-isotropic energy identity

Phospho-proteomics identifies a critical role of ATF2 in pseudorabies virus replication

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Virologica Sinica 2022年第4期37卷 591-600页

作者： fang-fang Jiang Ren-Qi Wang Chao-Yue Guo Ke zheng Hai-Long Liu Le Su Sheng-Song Xie huan-Chun Chen zheng-Fei Liu State Key Laboratory of Agricultural Microbiology Hongshan Laboratory and Key laboratory of Preventive Veterinary Medicine in Hubei ProvinceCollege of Veterinary MedicineHuazhong Agricultural UniversityWuhan430070China Key Lab of Agricultural Animal Genetics Breedingand Reproduction of Ministry of EducationHuazhong Agricultural UniversityWuhan430070China

Pseudorabies virus(PRV),an etiological agent of pseudorabies in livestock,has negatively affected the porcine industry all over the *** cells are reported as the first site of PRV ***,the role of host proteins and its related signaling pathways in PRV replication is largely *** this study,we performed a quantitative phosphoproteomics screening on PRV-infected porcine kidney(PK-15)epithelial *** 5723phosphopeptides,corresponding to 2180 proteins,were obtained,and the phosphorylated states of 810 proteins were significantly different in PRV-infected cells compared with mock-infected cells(P<0.05).GO and KEGG analysis revealed that these differentially expressed phosphorylated proteins were predominantly related to RNA transport and MAPK signaling *** functional studies of NF-κB,transcription activator factor-2(ATF2),MAX and SOS genes in MAPK signaling pathway were analyzed using RNA interference(RNAi)*** showed that only ATF2-knockdown reduces both PRV titer and viral genome copy *** pathway inhibition and CRISPR/Cas9 gene knockout showed that ATF2 was required for the effective replication of PRV,especially during the biogenesis of viral genome ***,by overexpression of the ATF2 gene and point mutation of the amino acid positions 69/71 of ATF2,it was further demonstrated that the phosphorylation of ATF2 promoted PRV *** findings suggest that ATF2 may provide potential therapeutic target for inhibiting PRV infection.

关键词： Pseudorabies virus(PRV) Transcription activator factor-2(ATF2) iTRAQ Proteomics Phosphorylation

Hadronic Scenarios for Gamma-Ray Emission from Three Supernova Remnants Interacting with Molecular Clouds

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Chinese Physics Letters 2014年第4期31卷 206-209页

作者： YU huan fang Jun ZHANG Li Department of Physics Yunnan University Kunming 650091 Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650011

GeV γ-rays detected with the large area telescope on board the Fermi Gamma-ray space telescope in the direc- tion of HB21, MSH 17-39 and G337.0-0.1 have been recently reported. The three supernova remnants （SNRs） show interactions with molecular clouds, and they are effective gamma-ray emitters as the relativistic protons accelerated by the SNR shocks inelastically colliding with the dense gas in the clouds. The origin of the observed γ-rays for the three remnants is investigated in the scenario of the diffusive shock acceleration. In the model, a part of the SNR shock transmits into the nearby molecular clouds, and the shock velocity is greatly reduced. As a result, a shock with a relatively low Alfven Mach number is generated, and the spectra of the accelerated protons and thee＇γ-ray photons produced via proton-proton interaction can be obtained. The results show that the observed γ-ray spectra for the three SNRs interacting with the molecular clouds can be reproduced. It can be concluded that the hadronic origin of the γ-rays for the three SNRs is approved, and the ability of SNR shocks to accelerate protons is also supported.

关键词： Clouds Hadronic large area telescope

Analysis of Topological Structure in Transiently Chaotic Neural Networks

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Acta Mathematicae Applicatae Sinica 2018年第3期34卷 610-621页

作者： Yang GAO Zuo-huan zheng Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences

Under the condition that the damping factor is between zero and one, chaotic dynamics is proved to exist in one-dimensional transiently chaotic neural networks by Li-Misiurewicz theorem. This result extends the previous result which is done under the condition that the damping factor is zero. Because the value of damping factor affects the speed of dynamical process of transiently chaotic neural networks, this result provides more complete theoretical basis for applications. Finally, two examples by numerical simulation are given to reinforce and illustrate this result.

关键词： transiently chaotic neural networks Li-Yorke chaos no division

Selective N-Methylation of N-Methylaniline with CO_(2) and H_(2) over Cu/In_(2)O_(3) Catalyst

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Chinese Journal of Chemistry 2024年第3期42卷 276-282页

作者： huan zheng Bo Qian Lin He State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouGansu730000 China University of Chinese Academy of Sciences Beijing100049 China

N-Methylation of amines with CO_(2) and H2 is a potential approach for CO_(2) utilization because N-methylated amines can be used as solvents and organic intermediates. In_(2)O_(3)-supported Cu (Cu/In_(2)O_(3)) acts as an effective heterogeneous catalyst for N-methylation reaction of N-methylaniline (MA) with CO_(2) and H_(2),showing higher N,N-dimethylaniline (DMA) selectivity than other supported Cu catalysts. On one hand,the dispersion of Cu can be improved by the defective In_(2)O_(3) support. On the other hand,In_(2)O_(3) support is active in the dissociative adsorption of CO_(2) through C—O bond breaking. In addition,the H_(2) dissociation ability of In_(2)O_(3) can also be enhanced by Cu. The combination of Cu and In_(2)O_(3) is effective in the activation of CO_(2),the adsorption of intermediate N-methylformanilide (MFA),the hydrogenation of MFA to DMA and the prohibition of C—N bond cleavage side reactions,thereby enhancing the reaction rate of MA conversion and the selectivity to DMA.

关键词： N-Methylation CO_(2) Cu/In_(2)O_(3) Supported catalysts Heterogeneous catalysis