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Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal:A combined simulation and experimental study

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International Journal of Mining Science and Technology 2023年第5期33卷 649-658页

作者： fen xu Shiwei Wang Rongjie Kong Chengyong Wang College of Environmental and Chemical Engineering Dalian UniversityDalian 116622China School of Mines and Mechanical Engineering Liupanshui Normal UniversityLiupanshui 553004China

The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank ***,in previous studies,the selection of surfactants was primarily based on flotation procedures,which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank *** this study,we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental *** maximum flotation mass recovery achieved was 82.89%using a 3:1 mixture of dodecane and castor oil ***-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal,enhancing the hydrophobicity of the *** addition,the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane ***,due to the presence of castor oil acid in the flotation process,the adsorption distance of dodecane and low-rank coal became *** dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic *** on these results,a better surfactant for flotation of low-rank coal is also proposed.

关键词： Low-rank coal Flotation Castor oil acid Surface hydrophobicity Molecular dynamics simulation

Three-dimensional Fusion of Spaceborne and Ground Radar Reflectivity Data Using a Neural Network–Based Approach

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Advances in Atmospheric Sciences 2018年第3期35卷 346-359页

作者： Leilei KOU Zhuihui WANG fen xu Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and Technology Nanjing 210044 China Meteorological Bureau of Jiangsu Province Nanjing 210008 China

The spaceborne precipitation radar onboard the Tropical Rainfall Measuring Mission satellite （TRMM PR） can provide good measurement of the vertical structure of reflectivity, while ground radar （GR） has a relatively high horizontal resolution and greater sensitivity. Fusion of TRMM PR and GR reflectivity data may maximize the advantages from both instruments. In this paper, TRMM PR and GR reflectivity data are fused using a neural network （NN）-based approach. The main steps included are： quality control of TRMM PR and GR reflectivity data; spatiotemporal matchup; GR calibration bias correction; conversion of TRMM PR data from Ku to S band; fusion of TRMM PR and GR reflectivity data with an NN method： interpolation of reflectivity data that are below PR＇s sensitivity; blind areas compensation with a distance weighting-based merging approach; combination of three types of data： data with the NN method, data below PR＇s sensitivity and data within compensated blind areas. During the NN fusion step, the TRMM PR data are taken as targets of the training NNs, and gridded GR data after horizontal downsampling at different heights are used as the input. The trained NNs are then used to obtain 3D high-resolution reflectivity from the original GR gridded data. After 3D fusion of the TRMM PR and GR reflectivity data, a more complete and finer-scale 3D radar reflectivity dataset incorporating characteristics from both the TRMM PR and GR observations can be obtained. The fused reflectivity data are evaluated based on a convective precipitation event through comparison with the high resolution TRMM PR and GR data with an interpolation algorithm.

关键词： TRMM PR ground radar 3D fusion neural network

Nitrogen-doped hierarchical porous carbon materials derived from diethylenetriaminepentaacetic acid (DTPA) for supercapacitors

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Journal of Materials Science & Technology 2018年第12期34卷 2384-2391页

作者： Tinghuan Wu Lixian Sun fen xu Dan Cai School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory oflnforrnation Materials Guilin 541004China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials Guilin 541004China

Nitrogen-doped porous carbon materials（NPCs） have been successfully fabricated by a simple one-step pyrolysis of diethylenetriaminepentaacetic acid（DTPA） in the presence of KOH. The as-synthesized NPCs displayed a high specific surface area(3214 m;g;) and a well-defined porous structure when the annealing temperature reached 800 ℃, which showed superior electrochemical performance as supercapacitor electrode materials. Electrochemical tests showed that the NPCs achieved an impressive specific capacitance of 323 F g;at a current density of 0.5 A g;in 6 M KOH aqueous solution and an outstanding cycle stability, negligible specific capacitance decay after 5000 cycles at 10 A g;. This strategy offered a new insight into the preparation of novel carbon materials for the advanced energy storage devices, such as supercapacitors, fuel cells and lithium ion batteries.

关键词： Supercapacitors DTPA Nitrogen-doped porous carbon materials

A New Pyridine-substituted Azadithiolate 2Fe2S Complex Related to the Active Site of[FeFe]-hydrogenase

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Chinese Journal of Structural Chemistry 2016年第2期35卷 237-245页

作者： xu fen-fen fenG Ya-Nan DU Shao-Wu CHEN Yi-feng No.2 Middle School of Nanchang Jiangxi 330006China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

A new 2Fe2 S complex[（2-C5H4N）N（μ-CH2S）2Fe2（CO）6]（1） related to the active site of[FeFe]-hydrogenase was obtained by treating（HS）2Fe2（CO）6 with（pyridin-2-ylazanediyl）*** occurred at the pyridine nitrogen atom when two equivalents of HBF4·OEt2acid were added to the toluene solution of 1,leading to the formation of[（2-C5H4NH）N（μ-CH2S）2Fe2（CO）6]·BF4·OEt2（1H~＋）,whose molecular structure was further established by singlecrystal X-ray *** 1 crystallizes in the monoclinic system,space group P21/n with α=7.728（3）,b = 11.825（4）,c = 17.888（6） A,β= 92.968（5）°,while complex 1H~＋ crystallizes in the triclinic system,space group P1 with a = 7.672（4）,b = 10.382（5）,c = 16.480（10） A,α=106.575（13）,β= 93.18（3）,γ=104.262（17）°.

关键词： bioinorganic chemistry [FeFe]-hydrogenase protonation proton reduction

The progress of epigenetics in the development and progression of non-alcoholic fatty liver disease

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Liver Research 2020年第3期4卷 118-123页

作者： fen xu Wanrong Guo Department of Endocrinology and Metabolism The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouChina Guangdong Provincial Key Laboratory of Diabetology GuangzhouChina

Non-alcoholic fatty liver disease(NAFLD)has become a global epidemic *** the pathogenesis of NAFLD remains to be uncovered,it is highly correlated with the changing of environment as other metabolic *** is the study on the differences of gene expression not caused by the changes in DNA *** epigenetics is considered to link the environment factors and the onset and development of *** an increasing number of researches on epigenetics have emerged in recent years,our understanding of how epigenetic factors take part in the pathogenesis of NAFLD has been *** article reviews the recent studies on important epigenetic factors contributing to the progression of NAFLD including the DNA methylation,modification of histones and non-coding *** may give us a hint to discover novel diagnosis methods and drug targets for NAFLD.

关键词： Non-alcoholic fatty liver disease(NAFLD) Metabolic associated fatty liver disease(MAFLD) Epigenetics DNA methylation Histone modifications Non-coding RNAs

Interleukin 17A deficiency alleviates neuroinflammation and cognitive impairment in an experimental model of diabetic encephalopathy

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Neural Regeneration Research 2022年第12期17卷 2771-2777页

作者： Xiao-Xia Fang fen-fen xu Zhan Liu Bei-Bei Cao Yi-Hua Qiu Yu-Ping Peng Department of Physiology School of Medicineand Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina

Interleukin 17A(IL-17A)was previously shown to be a key pro-inflammatory factor in diabetes mellitus and associated ***,the role of IL-17A in diabetic encephalopathy remains poorly *** this study,we established a mouse model of diabetic encephalopathy that was deficient in IL-17A by crossing Il17a-/-mice with spontaneously diabetic Ins2^(Akita)(Akita)*** glucose levels and body weights were monitored from 2-32 weeks of *** mice were 32 weeks of age,behavioral tests were performed,including a novel object recognition test for assessing short-term memory and learning and a Morris water maze test for evaluating hippocampus-dependent spatial learning and ***-17A levels in the serum,cerebrospinal fluid,and hippocampus were detected with enzyme-linked immunosorbent assays and real-time quantitative polymerase chain ***,proteins related to cognitive dysfunction(amyloid precursor protein,β-amyloid cleavage enzyme 1,p-tau,and tau),apoptosis(caspase-3 and-9),inflammation(inducible nitric oxide synthase and cyclooxygenase 2),and occludin were detected by western blot ***-inflammatory cytokines including tumor necrosis factor-α,interleukin-1β,and interferon-γin serum and hippocampal tissues were measured by enzyme-linked immunosorbent *** activation and hippocampal neuronal apoptosis were detected by immunofluorescent *** with that in wild-type mice,mice with diabetic encephalopathy had higher IL-17A levels in the serum,cerebrospinal fluid,and hippocampus;downregulation of occludin expression;lower cognitive ability;greater loss of hippocampal neurons;increased microglial activation;and higher expression of inflammatory factors in the serum and ***-17A knockout attenuated the abovementioned changes in mice with diabetic *** findings suggest that IL-17A participates in the pathological process of diabetic ***,IL-17A deficiency reduces

关键词： Akita mice apoptosis cognitive impairment diabetic encephalopathy hippocampus interleukin 17A mice microglia neuroinflammation neuron targeted treatment

Optical enhanced interferometry with two-mode squeezed twin-Fock states and parity detection

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Chinese Physics B 2020年第3期29卷 202-208页

作者： Li-Li Hou Shuai Wang xue-fen xu School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001China Department of Fundamental Courses Wuxi Institute of TechnologyWuxi 214121China

We theoretically investigate the quantum enhanced metrology using two-mode squeezed twin-Fock states and parity detection. Our results indicate that, for a given initial squeezing parameter, compared with the two-mode squeezed vacuum state, both phase sensitivity and resolution can be enhanced when the two-mode squeezed twin-Fock state is considered as an input state of a Mach–Zehnder interferometer. Within a constraint on the total photon number, although the two-mode squeezed vacuum state gives the better phase sensitivity when the phase shift φ to be estimated approaches to zero, the phase sensitivity offered by these non-Gaussian entangled Gaussian states is relatively stable with respect to the phase shift itself. When the phase shift slightly deviates from φ= 0, the phase sensitivity can be still enhanced by the two-mode squeezed twin-Fock state over a broad range of the total mean photon number where the phase uncertainty is still below the quantum standard noise limit. Finally, we numerically prove that the quantum Cramer–Rao bound can be approached with the parity detection.

关键词： quantum optics phase sensitivity quantum metrology

Synthesis, structure and photocatalysis properties of two 3D Isostructural Ln (Ⅲ)-MOFs based 2,6-Pyridinedicarboxylic acid

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Journal of Materials Science & Technology 2018年第9期34卷 1526-1531页

作者： Chenchen Zhang Siyue Wei Lixian Sun fen xu Pengru Huang Hongliang Peng School of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China Guangxi Key Laboratory of Information Materials Guilin 541004 China Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials Guilin 541004 China

Two new 3 D metal-organic frameworks（MOFs） named [Pr2（PDA）3-3 H2 O]-H2 O（1） and[Nd2（PDA）3-3 H2 O] H2 O（2） [2,6-Pyridinedicarboxylic acid（H2 PDA）] were synthesized by solvothermal method. They were characterized by elemental analyses（EA）, infrared spectroscopy（FT-IR）, thermogravimetric analysis（TG）, photocatalysis performance and single crystal X-ray diffraction studies（XRD）.The XRD analysis indicated that MOFs（1） and（2） both belong to the monoclinic system with space group P2（1）/C. The structural model were drawn by the diamond software, and the structure revel that MOFs（1） and（2） adopt three-dimensional（3 D） frameworks constructed by cross-linking of one-dimensional（1 D） infinite chain secondary building unit（SBU） by 2,6-Pyridinedicarboxylic acid and hydrogen bond as linker. These frameworks feature channels inside which coordinated H20 solvent molecules are located. Thermogravimetric analysis showed that both MOFs are thermally stable, the photocatalytic evaluation showed the materials have a good prospect in degration methylene blue. As for complex1, the decomposition efficiency of Methylene blue was about 91.08% after 130 min and the complex 2 reach 90.45% after 160 min under the sun light.

关键词： Metal-organic frameworks Solvothermal method Photocatalysis performance

The Number of Nonseparable Maps on the Projective Plane

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Acta Mathematicae Applicatae Sinica 2010年第3期26卷 489-494页

作者： Zhao-xiang Li Li-ying Mou fen Lei Jie xu Department of Mathematics Minzu University of China Beijing 100081 China

In this paper, we study the rooted nonseparable maps on the sphere and the projective plane with the valency of root-face and the number of edges as parameters. Explicit expression of enumerating functions are obtained for such maps on the sphere and the projective plane. A parametric expression of the generating function is obtained for such maps on the projective plane, from which asymptotic evaluations are derived. Moreover, if the number of edges is sufficiently large, then almost all nonseparable maps on the projective plane are not triangulation.

关键词： Nonseparable maps Enumerating function Asymptotic evaluation