检索结果-内蒙古大学图书馆

Quantitative detection of alkali metal Na based on laser-induced breakdown spectroscopy technology

Meitan Xuebao/Journal of the China Coal Society 2025年第4期50卷 2262-2270页

作者： Shen, Sijie Li, Chi Zhou, Wangzheng Wang, Zhenzhen Yan, Junjie Hou, Zongyu Wang, Zhe Deguchi, Yoshihiro School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing100084 China Institute for Carbon Neutrality Tsinghua University Beijing100084 China Department of Energy and Power Engineering Tsinghua University Beijing100084 China Shanxi Research Institute for Clean Energy Tsinghua University Taiyuan030032 China Graduate School of Technology Industrial and Social Sciences Tokushima University Tokushima770-8506 Japan

The alkali metal compounds released from high alkali fuels such as low-quality coal during thermal utilization can affect the normal operation of thermal equipment. Therefore, rapid online detection of alkali metal content in low-quality coal is of great significance for controlling alkali metal release during combustion. The alkali metal Na element is used as the detection object, and the mixed samples of graphite and sodium chloride powder with different ratios are used as experimental samples. The influencing factors of measuring Na element in samples using laser induced breakdown spectroscopy (LIBS) technology are studied. The impact of two signal strength calculation methods on signal stability is compared. The influence of experimental parameters on signal strength and signal-to-noise ratio is analyzed. The quantitative calculation models for Na element have been established. Research has shown that the characteristic spectral lines of Na element, Na I 588.995 nm and Na I 589.592 nm, are suitable as the main analytical spectral lines. Using the area intensity of the dual line characteristic spectral lines of Na element as the signal intensity can effectively improve signal stability. When the laser energy is 60 mJ and the delay time is 1 000 ns, the relative standard deviation of spectral signal intensity is low and the signal-to-noise ratio is high. The quantitative calculation models are established using traditional calibration method, partial least squares (PLS) method, and support vector machine (SVR) with spectral signal intensity as the input and Na element addition in the sample as the output. The accuracy of each model is compared and analyzed. The results indicate that the PLS model may exhibit overfitting when the sample size is small and the input quantity is large. The fitting accuracy of the SVR model is 0.978 3, the root mean square percentage error of the training set is 13.42%, and the root mean square percentage error of the test set is 13.51

关键词： Sodium chloride

来源：评论

学校读者我要写书评

暂无评论

FeCl₃-Catalyzed Multifunctional LMCT and HAT for Synthesis of Benzo[c]Coumarins from 2-Methyl-1,1′-Biaryls at Ambient Temperature

引用

ChemCatChem 2025年

作者： Wang, Hui-Lin Niu, Wen-Ting Zhang, Wen-Min Shi, Meng-Xin Li, Yang Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 712064 China

In this study, we report FeCl3-catalyzed multifunctional ligand-to-metal charge transfer (LMCT) and hydrogen atom transfer (HAT) for the synthesis of benzo[c]coumarins from 2-methyl-1,1′-biaryls. This catalytic syste... 详细信息

In this study, we report FeCl₃-catalyzed multifunctional ligand-to-metal charge transfer (LMCT) and hydrogen atom transfer (HAT) for the synthesis of benzo[c]coumarins from 2-methyl-1,1′-biaryls. This catalytic system is straightforward, only using FeCl₃·6H₂O as the catalyst and air as the oxidant under visible-light irradiation at ambient temperature. Mechanistic studies indicate that multifunctional LMCT and HAT processes generate chlorine radicals and aryl carboxyl radicals, which are key active species that facilitate the smooth transformation. © 2025 Wiley-VCH GmbH.

关键词： Aryl carboxyl radical Benzo[c]coumarins Chlorine radical Iron photocatalysis Multifunctional LMCT and HAT

来源：评论

学校读者我要写书评

暂无评论

Functional expression of proton pumps in Rhodobacter sphaeroides enhanced energy supply and photo-fermentative hydrogen production

引用

Bioresource Technology 2025年 432卷 132666页

作者： Mu, Xuefang Xu, Yuntong Ma, Yu Gao, Zixuan Feng, Jiali Wang, Minmin Cao, Wen Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Rood Xi'an710049 China College of Biology and Oceanography Weifang University Shandong Weifang261061 China

Photo-fermentative hydrogen production by Rhodobacter sphaeroides (R. sphaeroides) is an energy-consuming process. In this study, a proton-pumping channel (Proteorhodopsin (PR) or Gloeobacter rhodopsin (GR)) was introduced into R. sphaeroides HY01. The results indicated that PR could enhance the biomass of the strain during periods of resource scarcity. The cumulative hydrogen yield of mutant strains (HY01-PR and HY01-GR) increased by 66 % and 75 % compared with HY01 when glucose was fed, respectively. Notably, HY01-GR demonstrated tolerance to high acetate concentrations (93 mM). Moreover, the introduction of proton-pump resulted in a reduction of catabolism carbon flow and the accumulation of various metabolites. This study also confirmed that proton pump overexpression generated more ATP in the late stages of fermentation by coupling ATP synthase. Overall, these findings suggest that proton pumps could potentially be applied to photosynthetic organisms to regulate growth metabolism and enhance the production of valuable compounds. © 2025 Elsevier Ltd

关键词： Metabolites

来源：评论

学校读者我要写书评

暂无评论

Prediction of acoustic agglomeration enhanced by solid seed particles using the DSMC method

引用

Advanced Powder Technology 2025年第6期36卷

作者： Su, Junxu Wu, Zhihao Fan, Fengxian Hu, Xiaohong Su, Mingxu School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China

Acoustic agglomeration enhanced by large-sized solid seed particles is investigated using the direct simulation Monte Carlo (DSMC) method. The process of acoustic agglomeration is revealed in terms of temporal evolution of velocities, diameters, and number weights of simulated particles, as well as normalized concentration and average diameter of small particles. Furthermore, the enhancement of acoustic agglomeration by the solid seed particles is evaluated at varying parameters. The results show that the agglomeration performance is enhanced within a shorter residence time when the solid seed particles are present. Increasing acoustic intensity or solid seed particle concentration leads to more efficient acoustic agglomeration, while the acoustic frequency, particularly beyond 2 kHz, has little effect on agglomeration performance. Moreover, a noticeable increase in agglomeration efficiency is observed when the seed particle diameter increases from 20 to 40 µm. However, once it exceeds 40 µm, the increase in agglomeration efficiency diminishes. © 2025 The Society of Powder Technology Japan.

关键词： Agglomeration

来源：评论

学校读者我要写书评

暂无评论

Development of a two-phase flow solver with two-fluid model based on OpenFOAM: Validation against two-phase boiling flow

引用

Annals of Nuclear Energy 2025年 220卷

作者： Wu, Wenqiang Huang, Tao Du, Peng Feng, Zhenyu Zhang, Dalin Zhou, Lei Song, Gongle Deng, Jian Qiu, Zhifang Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Shaanxi Xi'an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China

The continuous advancement in computer technology and mathematical-physical models has significantly propelled the development of numerical reactor technology. There is a growing focus on high-fidelity, multi-scale, and multi-physics coupling within a unified framework. OpenFOAM, based on the finite volume method, has emerged as a promising tool for addressing this challenge. This study explores its capabilities in system-level scales, successfully developing a two-fluid, six-equation solver. The realistic closure models cover flow and heat transfer scenarios within vertical channels under pre-CHF conditions. A virtual thermal structure accounts for conjugate heat transfer between the fluid and the solid. Furthermore, the solver adheres to the discretization and solution principles within the OpenFOAM framework. The developed solver has been extensively validated against experimental data for two-phase boiling flow, with results showing good agreement, thereby demonstrating the solver's success. This work builds upon previous efforts involving the drift-flux solver and indicates that OpenFOAM can effectively handle one-dimensional or system-level scale calculations. It provides robust support for future endeavors in multi-scale and multi-physics coupling technologies. © 2025 Elsevier Ltd

关键词： Finite volume method

来源：评论

学校读者我要写书评

暂无评论

Proposal and performance analysis on thermal energy storage systems with live and reheat steam as heat sources to co-enhance the operational flexibility and efficiency of coal-fired power plants

引用

Journal of Energy Storage 2025年 127卷

作者： Yang, Shuokang Liu, Ming Zhang, Kezhen Liu, Miaomiao Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Xi'an Thermal Power Research Institute Co. Ltd. Xi'an710054 China

The high penetration of intermittent renewable power threatens the steady operation of the power grid, and the operational flexibility of schedulable power plants should be enhanced. Thermal energy storage (TES) emerges as a promising technique to enhance the operational flexibility of coal-fired power plants (CFPPs). In this study, molten salt thermal storage systems utilizing live and reheat steam as heat sources were proposed, and the steam ejectors were integrated to recover the residual pressure of exhausted steam from the TES system to co-enhance the operational flexibility and energy efficiency of coal-fired power plants. Two TES system schemes, i.e., the scheme D1 storing medium-temperature heat to heat feedwater afterwards, and the scheme D2 storing high-temperature heat to generate steam afterwards, were designed. Then, simulation models were developed, and performance indicators were defined. Results indicate that the operational flexibility of the coal-fired power plant can be enhanced by the integration of the TES system, and the adjustable minimum load ratio can be decreased from 30 % to 17.71 % and 17.83 % for the schemes D1 and D2, respectively. When the steam ejectors are integrated, the equivalent round-trip efficiency can be increased by 1.60 % and 2.43 % for schemes D1 and D2, respectively. The scheme D2 shows a higher equivalent round-trip efficiency of 46.69 %, surpassing the scheme D1. © 2025 Elsevier Ltd

关键词： Fossil fuel power plants

来源：评论

学校读者我要写书评

暂无评论

Confinement Effect Enhanced Ultra-Low Temperature Tolerance in Organo-Hydrogels with High Electrical Conductivities for Soft Electronics

引用

Advanced Functional Materials 2025年

作者： Wang, Jing Yao, Yanqiu Hao, Xin Pan, Jiahao Zhuang, Tiantian Guo, Liejin Wang, Hong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710054 China School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710054 China

Conducting organo-hydrogels is promising for soft electronics applications. However, conventional organo-hydrogels typically exhibit low electrical conductivity (−1) at subzero temperatures (←20 °C), severe... 详细信息

Conducting organo-hydrogels is promising for soft electronics applications. However, conventional organo-hydrogels typically exhibit low electrical conductivity (<5 S cm⁻¹) at subzero temperatures (←20 °C), severely limiting their utility in low-temperature soft electronics. In this work, a PEDOT:PSS-based all-polymer organo-hydrogel are developed with ultralow-temperature tolerance down to −90 °C and record high electrical conductivity up to 698.3 ± 37.3 S cm⁻¹. The high electrical conductivity is due to a developed preparation method and the ultra-low temperature tolerance property is attributed to the suppression of the coagulation of the organo-hydrogel with alcohols as well as the confinement effects of the porous structure existing in the hydrogel films. The obtained highly conductive organo-hydrogel films exhibit high performance in thermoelectrics, electromagnetic interference shielding, and stretchable strain sensors in subzero temperatures. A thermal driven grabber has been fabricated to demonstrate the good flexibility, the good strain–stress property, and the good Joule-heating ability of the conducting organo-hydrogels at low temperatures. This work extends the operational temperature limits of organo-hydrogel electronics to extreme cold environments (>−90 °C). © 2025 Wiley-VCH GmbH.

关键词： air-stable all polymer organo-hydrogels high electrical conductivity PEDOT:PSS ultra-low temperature tolerance

来源：评论

学校读者我要写书评

暂无评论

Evaporation of sub-millimeter flying dinitrogen tetroxide droplet under high temperature and pressure: Experimental measurement and theoretical modeling

引用

Chinese Journal of Aeronautics 2025年第05期 82-93页

作者： Lihan FEI Wu ZHU Yuyuan ZHANG Peng ZHANG Zuohua HUANG Chenglong TANG State Key Laboratory of Multiphase Flow and Power Engineering Xi'an Jiaotong University Department of Mechanical Engineering City University of Hong Kong

The evaporation behaviors are crucial for the flame location estimation in liquid rocketengines. This work, for the first time, experimentally reports the sub-millimeter droplet evaporationcharacteristics of the corrosive dinitrogen tetroxide（NTO, one prevailing hypergolic oxidizer） athigh ambient pressure up to 4.5 MPa. An in-house corrosion-resistant droplet generator is usedto generate isolated flying droplets of sub-millimeter size, which are then exposed in a gas environ-ment with temperatures between 1 010 K and 1 210 K and pressures in the range between 2.0 MPaand 4.5 MPa, provided by an optical rapid compression machine. Parallelly, a theoretical modelconsidering both the droplet ambient convection and the NTO dissociation is developed. Resultsindicate that firstly, the present theoretical model that considers the transient droplet-ambient con-vection as well as the temperature and pressure dependent rate of dissociation shows good agree-ment with the experimentally observed droplet lifetime. In addition, the flying droplets velocityregress gradually due to momentum exchange with the ambient, which is more prominent at higherpressure. The evaporation caused droplet size reduction is consistent with the classical D2-law pre-diction, in the present temperature and pressure range. Finally, higher temperature and pressureaccelerate the evaporation and an empirical correlation for the temperature and pressure dependentevaporation rate constant is proposed, which shows good agreement with experiment and simula-tion results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Pilot-Scale Photoreforming of Hydrolyzed Polylactic Acid Waste to High-Value Chemicals and H2 via Atomic Ru Integration

引用

Advanced Energy Materials 2025年第0期

作者： Liu, Feng Zhang, Chunyang Lu, Kejian Yan, Xueli Wang, Yi Jing, Dengwei Guo, Liejin Liu, Maochang International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China Suzhou Academy of Xi'an Jiaotong University Jiangsu Suzhou215123 China

Photoreforming of polylactic acid (PLA) waste into valuable chemicals offers a promising approach for environmental protection and waste valorization, yet faces challenges of low yields and harsh conditions. Herein, a Cd0.5Zn0.5S nanotwin catalyst decorated with Ru single atoms and clusters is reported, enabling selective photoreforming of PLA into pyruvic acid (PA) and H2. It is demonstrated that Ru single atoms favor PA formation via hydroxyl dissociation, while the further incorporation of Ru clusters serve as active sites for H2 production. This synergistic effect significantly enhances photocatalytic performance, achieving 96.8% PA selectivity and efficient H2 production with a record-breaking apparent quantum efficiency of 83.7% at 400 nm. This approach is scalable for outdoor processes, utilizing direct 1 m2 sunlight irradiation to deliver ≈1191 mL h−1 of H2 and 47.27 mmol h−1 of PA from PLA waste, paving a viable pathway for large-scale simultaneous production of high-value chemicals and H2. © 2025 Wiley-VCH GmbH.

关键词： Photolysis

来源：评论

学校读者我要写书评

暂无评论

Efficient conversion of CO2 to CH4 through supercritical water gasification of plastic with calcium looping

引用

Renewable Energy 2025年 249卷

作者： Li, Xuantong Wu, Hongtu Wang, Weizuo Wang, Junying Wu, Chunfei Jin, Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China School of Chemistry and Chemical Engineering Queen's University Belfast BelfastBT9 6FS United Kingdom

Calcium looping (CaL) is a promising technology with significant implications for carbon capture. However, the traditional CaL requires a high temperature of 950 °C for CaCO3 decomposition, posing challenges for further development due to stringent temperature conditions. This study leverages the advantages of a hydrogen-rich reaction environment in a supercritical water gasification (SCWG) system to develop a thermodynamic model of a solar-driven SCWG system incorporating CaL. This innovation reduces the high-temperature requirement of traditional CaL by 41 %, lowering it to 560 °C, and simultaneously alleviates the coupling difficulty of solar-driven systems. The system utilises waste carbide slag (CS) to convert waste plastics into combustible CH4 and other industrial products, achieving thermochemical elimination of CO2 into CH4. Results indicate that CH4 production in traditional gasification systems increases with temperature, whereas the inclusion of CaL shows a trend of initial increase followed by a decrease, peaking at 560 °C with a 19.12 % increase compared to systems without CaL. Both energy and exergy efficiencies decline with temperature, while the impact of pressure on gasification performance and system efficiency remains below 10 %. Increasing the plastic-to-water ratio enhances CH4 production and energy and exergy efficiencies but reduces the gas yield per unit of plastic. © 2025

关键词： Exergy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：