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Geoscience Frontiers 2024年第5期15卷 430-443页

作者： jinjun zhang School of Foreign Languages Hubei University of EconomicsWuhan 430205China

The energy access challenge remains a significant barrier to sustainable development,with millions of people still needing access to modern energy *** fuels have played a crucial role in meeting electricity demand,but they face challenges and drawbacks in terms of environmental sustainability,energy security,and climate *** study examines how renewable and non-renewable energy generation capacity impacted the environment in 53 upper-middle-income countries from 1990 to 2020,using energy access and alternative energy sources as mediating *** findings of this study provide valuable insights into the complex relationship between renewable energy generation capacity,energy access,alternative energy sources,and environmental conditions in upper-middleincome *** positive relationship between renewable energy generation capacity and environmental conditions emphasizes the importance and potential of renewable energy sources in mitigating environmental ***,the findings indicate that energy access also plays a crucial role in shaping energy generation patterns,with higher levels of access being associated with increased renewable energy generation and decreased reliance on non-renewable energy *** findings highlight the urgent need for policies and measures to promote renewable energy adoption and prioritize energy access to mitigate environmental degradation and achieve sustainable development goals.

关键词： Access to electricity Renewable power capacity Alternative and nuclear energy Fossil fuels electricity capacity Carbon Dioxide Emissions

Modeling the viscoelasto-plastic behavior of waxy crude

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Petroleum Science 2013年第3期10卷 395-401页

作者： Teng Houxing zhang jinjun National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Oil and Gas Distribution Technology China University of Petroleum

Waxy crude oil exhibits complex rheological behavior below the pour point temperature, such as viscoelasticity, yield stress, and thixotropy, owing to the formation of a three-dimensional spongelike interlock network structure. This viscoelasto-thixotropic behavior is an important rheologieal behavior of waxy crude oils, determining the flow recovery and safe restart of crude oil pipelines. Up to now, the thixotropic models for waxy crude have been all viscoplastic models, without considering the viscoelastic part before the yield point. In this work, based on analyzing the variation of the elastic stress and viscous stress in the Mujumbar model, a new viscoelasto-plastic model is proposed, whose shear stress is separated into an elastic component and a viscous component. The elastic stress is the product of the shear modulus and elastic strain; the shear modulus is proportional to the structural parameter. For the elastic strain, we followed the line of Zhu and his coauthors and assumed that it may be expressed by an algebraic equation. The model is validated by stepwise shear rate tests and hysteresis loop tests on Daqing and Zhongyuan waxy crude. The results show that the model＇s fitting and predictive capability is satisfactory.

关键词： Thixotropy viscoelasticity viscoelasto-plastic model thixotropic model waxy crude

Attractive nanofiber structure based on Cu-Ti/metal sandwich film with excellent electrocatalytic performance for ethanol oxidation

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Journal of Materials Science & Technology 2020年第23期58卷 215-221页

作者： Qingzhuo Hu Fabao zhang jinjun zhang Wei Jiang Bo zhang Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationHefei University of TechnologyHefei 230009China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Office of Academic Affairs Hefei University of TechnologyHefei 230009China

The support materials are an important part of catalysts and they are the dispersant,adhesive,and support for other *** this study,three types of thin films with different structures were used as the precursor to prepare loading Pd *** one-step dealloying method was used to prepare a semiconductor nanofiber film(NFF)support material with upward directional growth from the ***/NFF and Pd/Ni O/NFF loaded Pd catalysts were prepared using NFF as the support material,and the electrochemical catalytic properties for ethanol oxidation in alkaline media were *** votammetry showed that the NFF support material effectively inhibited agglomeration of palladium,increased the number of active sites of Pd,and improved the electrocatalytic properties of Pd for ethanol *** addition,the Pd/Ni O/NFF loaded Pd catalyst obtained by modification with nickel oxide significantly improved the electrocatalytic performance for ethanol oxidation compared with the Pd/NFF loaded Pd *** results show that Ni O is conductive to absorption of oxygen-containing groups on the surface of the catalyst and can further improve the electrocatalytic ability of Pd for ethanol *** of the above results demonstrate that the support material prepared by the dealloying method has application prospects in load-type catalysts.

关键词： Dealloying Support material Load-type catalyst Pd/NFF Pd/NiO/NFF

Investigation of Evaporated Fragments in Intermediate Energy Heavy Ion Collisions

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Chinese journal of nuclear physics 1997年第4期19卷 216-219页

作者： Liu, Fuhu zhang, jinjun Shanxi Teachers' Univ Linfen China

The reactions induced by intermediate energy heavy ions are *** evap-orated fragment multiplicity and excitation energy distributions are calculated and comparedwith the experimental data of the reaction Ar+Ag at 50 a... 详细信息

关键词： Intermediate energy heavy ion Collisions Evaporated fragment Multiplicity Excitation energy

Sulfur Distribution during Hydrothermal Liquefaction of Lignite, Wheat Straw and Plastic Waste in Sub-Critical Water

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China Petroleum Processing & Petrochemical Technology 2015年第1期17卷 24-30页

作者： Wang Baofeng Huang Yaru zhang jinjun School of Chemistry & Material Science Shanxi Normal University

The distribution and transformation of sulfur in products during hydrothermal liquefaction of lignite, wheat straw and plastic waste in sub-critical water were investigated in an autoclave. The influence of blending ratio, temperature, initial nitrogen pressure, residence time and additives on sulfur distribution was studied systematically. The results showed that most of sulfur existed as organic sulfur and transferred into the residue, and only a small part of sulfur transferred into oil and gas during hydrothermal liquefaction of lignite, wheat straw and plastic waste in sub-critical water. The results also showed that lower temperature(less than 300 ℃) was favorable for obtaining oil with low sulfur content. It can be also seen from the results that the best condition to obtain the oil with low sulfur content should be implemented at a lignite/wheat straw/plastic waste blending ratio of 5:4:1, an initial nitrogen pressure of 3 MPa and a residence time of 30 minutes. Furthermore, the results indicated that adding tourmaline during hydrothermal liquefaction of lignite, wheat straw and plastic waste was beneficial to production of oil with low sulfur content.

关键词： lignite, wheat straw, plastic waste, hydrothermal liquefaction, sulfur

Mesocrystalline TiO2/sepiolite composites for the effective degradation of methyl orange and methylene blue

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Frontiers of Materials Science 2018年第3期12卷 292-303页

作者： Ruirui LIU Zhijiang JI Jing WANG jinjun zhang State Key Laboratory of Green Building Materials China Building Materials Academy Beijing 100024 China

Mesocrystalline TiO2/sepiolite （TiS） composites with the function of adsorption and degradation of liquid organic pollutants were successfully fabricated via a facile and low-cost solvothermal reaction. The prepared TiS composites were characterized by FESEM, HRTEM, XRD, XPS, N2 adsorption-desorption, UV-vis DRS, and EPR. Results revealed the homogeneous dispersion of highly reactive TiO2 mesocrystals on the sepiolite nanofibers. Thereinto each single-crystal-like TiO2 mesocrystal comprised many [001]-oriented anatase nanoparticles about 10-20 nm in diameter. The photocatalytic activity was further evaluated by the degradation of anionic dye （methyl orange） and cationic dye （methylene blue） under the UV-vis light （350≤λ≤780 nm） irradiation. By selecting appropriate experimental conditions, we can easily manipulate the photocatalytic performance of TiS composites. The optimal TiS catalyst （the sepiolite content of 28.5 wt.%, and the reaction time of 24 h） could efficiently degrade methyl orange to 90.7% after 70 min, or methylene blue to 97.8% after 50 min, under UV-vis light irradiation. These results can be attributed to their synergistic effect of high crystallinity, large specific surface area, abundant hydroxyl radicals, and effective photogenerated charge separation.

关键词： TiO2/sepiolite mesocrystal solvothermal composites photocatalysis

Advances in rheology and flow assurance studies of waxy crude

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Petroleum Science 2013年第4期10卷 538-547页

作者： zhang jinjun Yu Bo Li Hongying Huang Qiyu National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum

Flow assurance is one of the core issues in safe and economical operation of waxy crude *** essence lies in flow and heat transfer of the *** the past 10 years,the authors＇ team has achieved a lot of innovative results in aspects of waxy crude rheology,flow assurance assessment,and pipelining technologies on the basis of decades of *** rheological characteristics of waxy crude are much better understood,and a method for quantitatively simulating the effect of flow shear was developed based on some theoretical *** of the mechanism of waxy crude rheology have been deepened to the quantitative *** successful development of efficient numericalalgorithms,accurate simulations have been achieved for various complex flow and heat transfer situations in waxy crude pipelining,and a reliability-based approach to flow assurance assessment has been set *** pipelining technologies have been developed such as batching pour-point depressant-（PPD-） treated multiple-waxy-crudes,intermittent transport of waxy crudes through long-distance pipelines,and batching hot and cold *** their application,a series of problems hindering safe,efficient and flexible operation of waxy crude pipelines were tackled,demonstrating that transportation technologies for waxy crude have advanced to a new and high level.

关键词： Waxy crude pipeline transportation flow assurance rheology numerical simulation

Characteristic Temperatures of Waxy Crude Oils

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Petroleum Science 2007年第3期4卷 57-62页

作者： Zhu Yingru zhang jinjun Li Hongying Chen Jun Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249 China

Gel point or pour point is widely used to evaluate the low temperature flowability of crude oil. However, it is not adequate to describe the gelling properties of waxy crude oils under flow conditions with gel point or pour point, since the theological behavior of crude oils is dependent on shear history. Waxy crude oils tend to gel at a low temperature. Based on gelation theory, the characteristic temperature of waxy crude oil was determined by analyzing viscosity-temperature data. Two mathematical models were developed for calculating characteristic temperatures of virgin crude oils and pour point depressants （PPD） beneficiated crude oils, respectively. By using these two models, the characteristic temperatures of crude oils that have experienced shearing and thermal histories can be predicted. The model for predicting the characteristic temperature of virgin crude oils has an average relative deviation of 4.5%, and all predicted values have a deviation within 2 ℃. Tested by 42 sets of data, the prediction model for crude oil treated with PPD has a high accuracy, with an average relative deviation of 4.2%, and 95.2 percent of predicted values have a deviation within 2 ℃. These two models provide useful ways for predicting the flowability of crude oils in pipelines when only wax content, wax appearance point and gel point are available.

关键词： Waxy crude low temperature flow ability characteristic temperature mathematical model

Hydrothermal Liquefaction of Wheat Straw in Sub-critical Water/Ethanol with Ionic Liquid for Bio-oil Production

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China Petroleum Processing & Petrochemical Technology 2015年第4期17卷 81-88页

作者： Wang Baofeng Han Shaohua zhang jinjun Institute of Resources and Erovironment Engineering Shanxi University School of Chemistry & Material Science Shanxi Normal University

Hydrothermal liquefaction of wheat straw in sub-critical water with ionic liquid was investigated in an autoclave. The product distribution at different temperatures and pressures was studied. The liquid oil and the residuals were tested by 1H NMR, FTIR and SEM techniques. The results indicated that under the same conditions, the oil yield from liquefaction of wheat straw in water/ethanol was higher than that in sub-critical water. The result also showed that under the investigated conditions, adding 1-butyl-3-methylimidazolium chloride([Bmim]Cl) could increase the total conversion and gas yield, while at the same time the yield of n-hexane insoluble fraction and the tetrahydrofuran soluble fraction was reduced. Moreover, the results also showed that upon adding [Bmim]Cl the contents of the aliphatic hydrogen and phenols in liquid oil also increased along with improved oil quality.

关键词： wheat straw liquefaction sub-critical water ionic liquid

Physical properties of wax deposits on the walls of crude pipelines

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Petroleum Science 2009年第1期6卷 64-68页

作者： Huang Qiyu Wang Jifeng zhang jinjun Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249 China

Wax deposits on the wall of a crude oil pipeline are a solid wax network of fine crystals, filled with oil, resin, asphaltene and other impurities. In this paper, a series of experiments on wax deposition in a laboratory flow loop were performed under different conditions （flow rate, temperature differential between crude oil and pipeline wall, and dissolved wax concentration gradient）, and the wax deposits were analyzed, so quantitative relationships among wax content, wax appearance temperature （WAT）, shear stress, and radial concentration gradient of dissolved wax at the solid/liquid interface were obtained. Finally, a model was established to predict WAT and the wax content of the deposit.

关键词： Crude oil wax deposits pipeline wax content wax appearance temperature (WAT)