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现实成因、基本样态、治理路径:“大党独有难题”基本问题论析

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思想理论战线 2024年第4期3卷 10-18,140页

作者：丁新改田芝健中国矿业大学马克思主义学院江苏徐州221116 苏州大学马克思主义学院江苏苏州215123

党的二十大以来,习近平多次强调必须“时刻保持解决大党独有难题的清醒和坚定”,并围绕“大党独有难题”作出一系列重要论述,深刻回答了“为什么必须时刻保持解决大党独有难题的清醒和坚定”“什么是大党独有难题”“如何解决大党独有... 详细信息

党的二十大以来,习近平多次强调必须“时刻保持解决大党独有难题的清醒和坚定”,并围绕“大党独有难题”作出一系列重要论述,深刻回答了“为什么必须时刻保持解决大党独有难题的清醒和坚定”“什么是大党独有难题”“如何解决大党独有难题”等基本问题。“时刻保持解决大党独有难题的清醒和坚定”,是走好全面建设社会主义现代化国家新的赶考之路的现实要求,是始终赢得人民拥护、巩固长期执政地位的必然选择,是深入推进新时代党的建设新的伟大工程的内在需要。新时代新征程,解决大党独有难题要以坚持和加强党的全面领导为根本原则,以大兴调查研究之风为切入点和突破口,以扎实做好跳出历史周期率“两个答案”为基本方略,以严格执行“三个务必”为战略安排,以完善管党治党规章制度体系为重要保障,为强国建设、民族复兴提供坚强保证。

关键词：习近平 “大党独有难题” 党的自我革命全面从严治党

Frequency-Domain Full-Waveform Inversion Based on Tunnel Space Seismic Data

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Engineering 2022年第11期18卷 197-206页

作者： Mingyu Yu Fei Cheng Jiangping Liu Daicheng Peng zhijian tian Hubei Subsurface Multiscale Imaging Key Laboratory(SMIL) Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China

Tunnel seismic detection methods are effective for obtaining the geological structure around the tunnel face,which is critical for safe construction and disaster mitigation in tunnel ***,there is often a lack of accuracy in the acquired geological information and physical properties ahead of the tunnel face in the current tunnel seismic detection ***,we apply a frequency-domain acoustic full-waveform inversion(FWI)method to obtain high-resolution results for the tunnel *** discuss the influence of the frequency group selection strategy and the tunnel observation system settings regarding the inversion results and determine the structural imaging and physical property parameter inversion of abnormal geological bodies ahead of the tunnel *** on the conventional strategies of frequency-domain acoustic FWI,we propose a frequency group selection strategy that combines a low-frequency selection covering the vertical wavenumber and a high-frequency selection of *** strategy can effectively obtain the spatial structure and physical parameters of the geology ahead of the tunnel face and improve the inversion *** addition,by linearly increasing the side length of the tunnel observation system,we share the influence of the length of the two sides of the observation systems of different tunnels on the inversion *** found out that the inversion results are the best when the side length is approximately five times the width of the tunnel face,and the influence of increasing the side observation length beyond this range on the inversion results can be ***,based on this approach,we invert for the complex multi-stratum model,and an accurate structure and physical property parameters of the complex stratum ahead of the tunnel face are obtained,which verifies the feasibility of the proposed method.

关键词： Tunnel seismic detection Full-waveform inversion Frequency select strategy Observation system

Layer-structure adjustable MoS_(2) catalysts for the slurry-phase hydrogenation of polycyclic aromatic hydrocarbons

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Journal of Energy Chemistry 2021年第12期30卷 294-304,I0007页

作者： Donge Wang Jiahe Li Huaijun Ma Chenggong Yang Zhendong Pan Wei Qu zhijian tian Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Slurry-phase hydrogenation technology is the frontier topic in the efficient conversion of heavy oils into light fractions around the *** highly active dispersed MoS_(2) catalysts is the major obstacle to realize the industrial application of upgrading heavy *** this work,both top-down ball-milling method and bottom-up hydrothermal method were designed to synthesize MoS_(2) catalysts with controllable layer *** stacking layers and lateral sizes for micro-scaled MoS_(2) catalysts by ball-milling method can be reduced to their limits and stabilize at 6~8 layers and lateral size of ca.30 *** more flexible bottom-up hydrothermal method can construct MoS_(2) catalysts with much smaller lateral sizes and fewer stacking layers,especially,MoS_(2) catalyst fabricated with ammonium tetrathiomolybdate as Mo and S precursor possesses average stacking layers of 2 and lateral size of 5 ~ 10 *** aromatic hydrocarbons anthracene,phenanthrene and naphthalene were used as model compounds of heavy oils to investigate the catalytic hydrogenation performance of designed MoS_(2) *** catalytic activities of MoS_(2) catalysts can be well correlated with their stacking layers and lateral *** edges of top and bottom S-Mo-S atomic layers for MoS_(2) sheets,named rim sites,are positively correlated with the exposure of active sites for catalytic hydrogenation of *** highest catalytic activity of MoS_(2) catalyst results from its layer structures of 100% rim sites and the smallest lateral size of5 ~ 10 nm,which is beneficial to expose maximum active sites for catalytic hydrogenation *** work can guide us to design the highly active hydrogenation catalysts,and promote the industrial application of upgrading heavy oils.

关键词： MoS_(2) Active sites Catalytic hydrogenation Slurry-phase Polycyclic aromatic hydrocarbons

Learning-Based Dynamic Connectivity Maintenance for UAV-Assisted D2D Multicast Communication

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中国通信:英文版 2023年第10期20卷 305-322页

作者： Jingjing Wang Yanjing Sun Bowen Wang Shenshen Qian zhijian tian Xiaolin Wang School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China XCMG Fire-Fighting Safety Equipment Co. LtdXuzhou 221004China School of Mines China University of Mining and TechnologyXuzhou 221116China

Unmanned aerial vehicles(UAVs) enable flexible networking functions in emergency ***,due to the movement characteristic of ground users(GUs),it is challenging to capture the interactions among ***,we propose a learningbased dynamic connectivity maintenance architecture to reduce the delay for the UAV-assisted device-todevice(D2D) multicast *** this paper,each UAV transmits information to a selected GU,and then other GUs receive the information in a multi-hop *** minimize the total delay while ensuring that all GUs receive the information,we decouple it into three subproblems according to the time division on the topology:For the cluster-head selection,we adopt the Whale Optimization Algorithm(WOA) to imitate the hunting behavior of whales by abstracting the UAVs and cluster-heads into whales and preys,respectively;For the D2D multi-hop link establishment,we make the best of social relationships between GUs,and propose a node mapping algorithm based on the balanced spanning tree(BST) with reconfiguration to minimize the number of hops;For the dynamic connectivity maintenance,Restricted Q-learning(RQL) is utilized to learn the optimal multicast ***,the simulation results show that our proposed algorithms perfor better than other benchmark algorithms in the dynamic scenario.

关键词： cluster-head selection whale optimization algorithm(WOA) balanced spanning tree(BST) multi-hop link establishment dynamic connectivity maintenance

Reactions in a Mixture of CH_4 and CO_2 under the Action of Microwave Discharge at Atmospheric Pressure

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Journal of Natural Gas Chemistry 2002年第1期11卷 28-32页

作者： Yunpeng Xu zhijian tian Zhusheng Xu Liwu Lin Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China

Reactions between CH_4 and CO_2 under the action of continuous microwave discharge at atmospheric pressure were studied in a special homemade reactor. The main products were CO and H2, while acetylene and ethylene were also found in the products. Experimental results show that conversions of CH4 and CO2 could be higher than 90% without the presence of any catalyst. Effects of CO2/CH4 molar ratio and total flow rate of the feed gas on the reaction were also investigated.

关键词： CH_4 CO_2 microwave discharge atmospheric pressure

Microemulsion-mediated hydrothermal synthesis of flower- like MoS2 nanomaterials with enhanced catalytic activities for anthracene hydrogenation

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 32-42页

作者： Yuxia Jiang Donge Wang Zhendong Pan Huaijun Ma Min Li Jiahe Li Anda Zheng Guang Lv zhijian tian Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Flower-like intercalated MoS2 nanomaterials have been successfully synthesized via a microemulsion- mediated hydrotherrnal （MMH） method, and characterized by X-ray diffraction, Raman spectroscopy, element analysis, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy in detail. Their catalytic performance for anthracene hydrogenation was evaluated using a slurry-bed batch reactor with an initial hydrogen pressure of 80 bar at 350 ℃ for 4 h. The intercalated MoS2 nanoflowers synthesized from Na2MoO4 （MoS2-S） and H2MoO4 （MoS2-A） as molybde- num precursors have diameters of about 150 and 50 nm, respectively. MoS2 nanosheets on MoS2-S and MoS2-A possess stacking layer numbers of 5-10 and 2-5, and slab lengths of about 15 and 10 nm, respectively. The interlayer distances of MoS2-S and MoS2-A are both enlarged from 0.62 nm to about 0.95 nm due to the intercalation ofNH4＋ and surfactant molecules. The MoS2 nanoflowers have high catalytic activities for anthracene hydrogenation. The selectivity for octahydroanthracene, a deeply hydrogenated product, over MoS2-A is 89.8%, which is 31.0 times higher than that over commercial bulk MoS2. Fully hydrogenated product （perhydroanthracene） was also detected over MoS2 nanoflowers with a selectivity of 3.7%. The enhanced hydrogenation activities of MoS2 nanoflowers can be ascribed to the high exposure of catalytic active sites, resulting from the smaller particle size, fewer stacking layer, shorter slab length and enlarged interlayer distance of MoS2 nanoflowers compared with commercial bulk MoS2. In addition, a possible growth mechanism of MoS2 nanoflowers synthesized via the MMH method was proposed.

关键词： microemulsion intercalated MoS2 catalytic hydrogenation active sites

HREELS STUDY OF O2 AND CH3OH ADSORPTION ON NIOBIUM（110）

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Chinese Journal of Catalysis 1996年第4期 12-13页

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Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst

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Petroleum Science 2013年第2期10卷 242-250页

作者： Chi Kebin Zhao Zhen tian zhijian Hu Sheng Yan Lijun Li tianshu Wang Bingchun Meng Xiangbin Gao Shanbin Tan Mingwei Liu Yanfeng State Key Laboratory of Heavy Oil Processing China University of Petroleum Petrochemical Research Institute PetroChina Company Limited Dalian Institute of Chemical Physics Chinese Academy of Sciences

Hydroisomerization catalysts Pt/ZSM-22, Pt/ZSM-23, and Pt/ZSM-22/ZSM-23 were prepared by supporting Pt on ZSM-22, ZSM-23, and intergrowth zeolite ZSM-22/ZSM-23, respectively. The typical physicochemical properties of these catalysts were characterized by X-Ray Diffraction （XRD）, N2 absorption-desorption, Pyridine-Fourier Transform Infrared （Py-FTIR）, Transmission Electron Microscopy （TEM）, X-Ray Fluorescence （XRF）, Scanning Electron Microscopy （SEM） and NH3- Temperature Programmed Desorption （NH3-TPD）, and the performance of these catalysts in n-dodecane hydroisomerization was evaluated in a continuous down-flow fixed bed with a stainless steel tubular reactor. The characterization results indicated that the intergrowth zeolite ZSM-22/ZSM-23 possessed the dual structure of ZSM-22 and ZSM-23, and the catalyst Pt/ZSM-22/ZSM-23 had similar pores and weak acidity to Pt/ZSM-22 and Pt/ZSM-23 catalysts. Moreover, Pt/ZSM-22/ZSM-23 catalyst showed a high selectivity in hydroisomerization of long chain n-alkanes to mono-branched isomers. The evaluation results for n-dodecane hydroisomerization indicated that the activity of Pt/ZSM-22/ZSM-23 was the lowest, while the hydroisomerization selectivity was the highest among the three catalysts. The maximum yield of i-dodecane product was 68.3% over Pt/ZSM-22/ZSM-23 at 320 ℃.

关键词： ZSM-22/ZSM-23 intergrowth zeolite platinum catalyst n-dodecane hydroisomerization

A Thermodynamic Analysis on the Catalytic Combustion of Methane

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Journal of Natural Gas Chemistry 2003年第4期12卷 237-242页

作者： Weicheng Liu, Yunpeng Xu, zhijian tian, Zhusheng XuDalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, China Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Chemical equilibria involving 10 species and adiabatic reaction temperatureof methane combustion in air under various conditions have been calculated in detail by means oftotal Gibbs energy minimization of the system. The calculation data show that the adiabaticcombustion temperature of CH_4 and air at stoichiometric ratio is up to about 2200 K, and theequilibrium concentration of NO is about 0.0018, however that of NO2 is only 1 x 10^(-6). A largeamount of carbon deposition emerges when the CH_4 concentration is above 26.5%. The NO and NO_2appear only when the CH_4 concentration is below 16%. The maximum equilibrium concentrations of NOand NO_2 are 0.0028 and 2 x 10^(-6) respectively, at about 8%CH_4 concentration. The NO and NO_4concentrations increase with the system temperature at a low CH_4 concentration. However, both ofthem can be decreased when CO_2 or steam is introduced into the system, which also decreases theadiabatic combustion temperature. The decrease in adiabatic temperature caused by CO_2 addition ismore appreciable than that caused by the addition of H_2O. Pressure does not have a notable effecton the system equilibrium at a low methane concentration.

关键词： methane natural gas combustion thermodynamics equilibrium