检索结果-内蒙古大学图书馆

SSRN 2021年

作者： Liu, Dashuai Dou, Binlin Zhang, Hua Wu, Kai Zhao, Longfei Zeng, Pingchao Chen, Haisheng Xu, Yujie School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China

In this study, glycerol aqueous phase reforming was carried out in a batch reactor. The gases produced were H2, CO, CH4, and CO2 during the experiment. The catalysts used included Ni or/and Co catalysts supported by MgO. Meanwhile, two different MgO supporters were prepared by the sol-gel method and calcining method, and the active metal was added by an initial wet impregnation (IWI) method. The catalysts were characterized by BET, BJH, TEM, and XRD. In order to achieve the purpose of comparison, the activity of different types of catalysts was tested under similar conditions. It was found that the amount of hydrogen produced by the catalyst containing gelatinous MgO supporter is more than 1.5 times that of other catalysts, and the Ni-Co-MgO had the best catalytic effect among the same types of catalysts. The activity of the Ni-Co-MgO catalyst was tested under different temperatures, concentrations, and CaO conditions. We found that Ni-Co bimetallic catalyst supported on gelatinous MgO has the best highest gas production, while the catalyst containing calcined MgO support usually has a better hydrogen selectivity. Through the stability study of the Ni-Co-MgO catalyst, we found that the bimetallic catalyst supported by gelatinous MgO support has better catalytic stability. © 2021, The Authors. All rights reserved.

关键词： Sol-gel process

来源：评论

学校读者我要写书评

暂无评论

Physics-Based Probabilistic Assessment of Creep-Fatigue Failure for Pressurized Components by Extended Direct Steady Cycle Analysis-Driven Neural Network

SSRN

引用

SSRN 2022年

作者： Wang, Xiaoxiao Ma, Zhiyuan Yang, Jie Chen, Haofeng Xuan, Fuzhen Department of Mechanical & Aerospace Engineering University of Strathclyde James Weir Building 75 Montrose Street GlasgowG1 1XJ United Kingdom Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China School of Mechanical and Power Engineering East China University of Science and Technology Shanghai200237 China

To achieve a high-reliability design with a feasible balance between accuracy and efficiency, the physics-based probabilistic assessment for creep-fatigue failure is proposed under the probabilistic Linear Matching Method (pLMM) framework. At the physical level, the structural failure mechanism is reflected in the prepared training database, which is generated by the direct method, extended Direct Steady Cycle Analysis (eDSCA) procedures. And to efficiently express the relationship between design parameters and structural responses implicitly, the extended DSCA-driven neural network (EDDNN) is built with the superior fitting quality of damage and lifetime. With the benchmarks of pressurized structures provided, the applicability of the proposed probabilistic analysis approach in solving practical problems is demonstrated, where the reliability-based evaluation diagram is established according to different requirements. Furthermore, a novel data classification scheme is proposed to deal with the randomness in creep damage-dominated probabilistic assessment. © 2022, The Authors. All rights reserved.

关键词： Failure (mechanical)

来源：评论

学校读者我要写书评

暂无评论

RECENT ADVANCES OF SURFACE WETTABILITY EFFECT ON flow BOILING HEAT TRANSFER PERFORMANCE

引用

Frontiers in Heat and Mass Transfer 2021年 17卷

作者： Cao, Shuang Yang, Hui Zhao, Luxing Wang, Tao Xie, Jian School of Energy and Power Engineering Zhengzhou University of Light Industry Zhengzhou450002 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China

flow boiling heat transfer is an effective way to fulfill the energy transfer. The wettability of boiling surface influences the liquid spreading ability and the growth, departure, and release frequency of bubbles, which determines the heat transfer performance. According to the wettability and combination forms, boiling surface are classified into weak wetting surface, strong wetting surface, and heterogeneous wetting surface. Fabricating by physical, chemical method or coating the original surface with a layer of low surface energy, the weak wetting surface has more effective activation point and nucleation center density to improve heat transfer performance at low heat flux. The strong wetting surface always formed by physical or chemical treatment to enhance the rapid rewetting of the wall surface. It has a smaller bubble separation diameter, higher separation frequency and higher CHF. The heterogeneous wetting surface, having the synthetic effects of the strong and weak surface wettabilities, is a hot issue of recent study. But its composition and heat transfer enhancement mechanism are very complicated which need to study thoroughly. Furthermore, the intelligent wetting surface, having the dynamics wettability function, is also briefly analyzed in this paper. Despite the advances in this aspect, the boiling surfaces can be further optimized by fabricate effective wettability to achieve a strong stability, high heat transfer performance and realize the synergistic effect of flow pattern and heat transfer. © 2021, Global Digital Central. All rights reserved.

关键词： Wetting

来源：评论

学校读者我要写书评

暂无评论

Electromagnetic-conductance measurement method for the flow rate and void fraction of gas-liquid two-phase flows

引用

Measurement: Sensors 2020年 10-12卷

作者： Chang, Fucheng Hu, Zitu Li, Xi Feng, Zongrui Ni, Shiyao Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China

Gas-liquid two-phase flow systems are widely existed in many engineering systems and industrial processes, and measurement techniques for two-phase flows are crucial in a diverse range of engineering applications. Most of the existing measurement techniques usually brought extra resistance to the flow in the branch pipes and, to some extent, influenced the original distribution of the gas-liquid two-phase flows in the parallel T-junction system. In order to study the distribution characteristics of two-phase flow in vertically parallel T-junctions, the electromagnetic-conductance measurement method was developed to measure the void fraction and liquid flow rate of the gas-liquid two-phase flow in the branch pipes. Electromagnetic-conductance measurement technique has the advantages of high response rate, satisfactory accuracy and low disturbance on the flow field of gas-liquid two-phase flows. In order to calibrate the conductance measurement method, experiments were carried out with the liquid velocity range of 0.2–2 m·s-1, the gas velocity range of 0–50 m·s-1 and the volume void fraction range of 0–0.99. Through the calibration experiments, the relationship between the resistance value of each conductivity sensor and the volume void fraction of two-phase fluid was decided to be established as a logistic function. By the error analysis of the calibration results, 75.9% of experimental results of the void fraction in the gas-liquid two-phase flow fell within the ±20% error bands. The electromagnetic-conductance measurement method proposed in this paper could provide a reference for accurate and non-interference measurement of two-phase flow in parallel T-junctions. © 2020 The Authors

关键词： Two phase flow

来源：评论

学校读者我要写书评

暂无评论

Chlorine anchored pyrrole-based conjugated porous polymers for ultrahigh capacity and selective Hg(II) capture

引用

Separation and Purification Technology 2025年 374卷

作者： Bianyan He Jiarui Zhang Yubing Wang Mingtao Li Wei Yan Department of Environmental Science and Engineering Xi’an Key Laboratory of Solid Waste Recycling and Resource Recovery Xi’an Jiaotong University Xi’an 710049 PR China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China

In this study, chlorine anchored pyrrole-based conjugated porous polymers (CPPs) with distinct pore properties were synthesized using the Knoevenagel reaction and the double chain condensation method. The partially crosslinked and partially oxidized structures of the materials exhibit a unique microstructure integrating interconnected nets and molecular hooks. This architecture utilizes pore channels for physical interception of Hg(II), while synergistic chemical immobilization at N, O, and Cl active sites enables multifunctional enhancement of Hg(II) capture efficiency. Among these materials, the maximum adsorption capacity reached 1183 mg·g −1 , demonstrating ultrahigh selectivity. Moreover, the adsorbents maintained > 90 % removal efficiency over 10 adsorption–desorption cycles, confirming excellent reusability. Mechanistic studies revealed that Hg(II) adsorption primarily whin material pores through hydrogen bonding and coordination interactions, and their synergistic interactions. This work highlights the efficiency of the double chain condensation design strategy in advancing conjugated porous polymers for the removal of heavy metals, particularly Hg(II), from wastewater.

关键词： Conjugated porous polymers Synergistic adsorption Heavy metal ion Hg(II) capture

来源：评论

学校读者我要写书评

暂无评论

Numerical and experimental studies on the influences of flow field on the measurement accuracy of ultrasonic water meters

Numerical and experimental studies on the influences of flow...

引用

作者： Ji, Jieqiang Zheng, Jianying Chen, GuoFu Wu, Xiaojie Zhang, NingNing Fang, Yan Cheng, Leming Zhejiang Province Institute of Metrology Hangzhou310018 China National Centre of Quality Supervision and Testing on Liquid Flow Measuring Instruments Hangzhou310018 China State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou310027 China

CFD modelling and experiments are carried out to study the influences of flow field on the measurement accuracy of ultrasonic water meters. The swirl generator and flow disturber are selected to change the flow field distributions inside the pipe. The calculation results show that the installation of left-handed swirl generator induces a specific flow pattern of the fluid inside the pipe, while the installation of flow disturber leads to the distortion of the axial velocity distributions. The critical distance of the fluid reaching the steady flow is 10D for left-handed swirl generator and flow disturber. In the experiment part, six different ultrasonic water meters are selected for the intrinsic errors tests. The results show that the installations of swirl generator and flow disturber induce the intrinsic errors shift to negative values. Compared with the flow disturber, the swirl generator has greater impact on the measurement accuracy. © 2021

关键词： flow fields

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation of Acoustic Propagation in Gas Ultrasonic flowmeter

SSRN

引用

SSRN 2022年

作者： Xiao, Yongqing Zhang, Meng Li, Dong Yang, Yueming Ma, Bingkun Qi, Jianhui School of Energy and Power Engineering Shandong University Jinan250061 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China Suzhou Research Institute Shandong University Suzhou215123 China Shandon Academy of Sciences China

Ultrasonic flowmeter has been widely used in chemical smelting, industrial production and other fields. Through the COMSOL Multiphysics software, the non-linear trajectory of the rays in the non-invasive and intrusive UFW is first simulated by the ray tracing method. Then, the transient ultrasonic propagation process is simulated to analyze the reasons for the error of ultrasonic propagation. Finally, the cause of the error of the transducer is analyzed by the sound pressure signal at the receiving end. It was found that it is precisely because of the high-speed flow that the ultrasonic propagation is distorted, which is manifested as the non-linear trajectory and downstream drift of the sound beam. The signal at the receiving end also fails to hit the correct position due to beam drift, resulting in sound pressure falling below the detected value. © 2022, The Authors. All rights reserved.

关键词： flow measurement

来源：评论

学校读者我要写书评

暂无评论

Bowl-Shaped Carbon Loaded Co9s8 Nanoparticles Connected by Carbon Nanotubes with Excellent Rate Performance for Sodium-Ion Batteries

SSRN

引用

SSRN 2022年

作者： Yang, Guorui Zhou, Ziyi Liu, Xiaofeng Zhang, Yue Wang, Silan Yan, Wei Ding, Shujiang School of Chemistry Engineering Research Center of Energy Storage Materials and Devices Ministry of Education "Four Joint Subjects One Union" School Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology Xi’an Jiaotong University Xi’an710049 China Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'An710049 China

Sodium-ion batteries (SIBs) are expected to replace lithium-ion batteries in the energy storage sector owing to their low cost and abundant resources. However, developing suitable anode materials to meet the high energy density requirements of SIBs remains an ongoing challenge. Herein, we design a hollow nitrogen-doped bowl-like carbon decorated with Co9S8 nanoparticles linked by carbon nanotubes (HNBC@Co9S8@CNTs) as an anode material for SIBs. The HNBC@Co9S8@CNTs electrode exhibits impressive rate performance (280.9 mAh g-1 at 5 A g-1) and cycling stability (426.5 mAh g-1 after 500 cycles at high current density of 1 A g-1) due to the advantages of highly conductive three-dimensional (3D) interconnected structures. In addition, its pseudo-capacitance and sodium storage diffusion kinetics are analyzed in depth using Cyclic Voltammetry (CV) and galvanostatic intermittent titration technique (GITT). The results elucidate that the partially surface-induced capacitive sodium storage, highly conductive 3D interconnected structures, and fast reaction kinetics synergistically contribute to the high-rate performance. This work may provide new insights for the fabrication of various metal sulﬁde or sulﬁde composites with high sodium storage capacity. © 2022, The Authors. All rights reserved.

关键词： Sodium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

Research Square

引用

Research Square 2021年

作者： Wang, Jing Wang, Yizhuo Li, Qing Li, Zhanchao Xu, Liqing Li, Kuncai Wang, Hong Frontier Institute of Science and Technology Xi’an Jiaotong University Xi’an710054 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710054 China

The transport mechanism of organic materials is still far away from being well understood and controlled although conducting polymers have been discovered since 1977. It is rare to see conducting polyers possessing high bipolar (p- and n-type) electrical conductivities within a single bulk doped organic polymer without the assistant of gate voltage. Here, we report a novel approach to provide high performance n-type materials by p-type doping. More importantly, the bipolar electrical conductivities of the donor-acceptor conducting polymer are high, resulting high bipolar power factors among the solution-processable ambipolar D-A copolymers. A fully organic p-n junction is created in a planar film, exhibiting a high rectification ratio of 2 x 102 at ±5 V with a high current density of 3 A/cm2. Structural and spectroscopic tests have been performed to provide a fundamental understanding of the polarity switching mechanism. The results open the opportunity of making p- and n-type modules with a single conducting polymer for future modern organic electronics. © 2021, CC BY.

关键词： Conducting polymers

来源：评论

学校读者我要写书评

暂无评论

MgO and Au nanoparticle Co-modified g-C_(3)N_(4)photocatalysts for enhanced photoreduction of CO_(2)with H_(2)O

引用

Chinese Journal of Catalysis 2021年第5期42卷 781-794页

作者： Naixu Li Meiyou Huang Jiancheng Zhou Maochang Liu Dengwei Jing School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189JiangsuChina International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Jiangsu Key Laboratory for Biomass Energy and Material Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042JiangsuChina Suzhou Academy of Xi’an Jiaotong University Suzhou 215123JiangsuChina

The photoreduction of CO_(2)to achieve high-value-added hydrocarbons under simulated sunlight irradiation is advantageous,but *** this study,a series of MgO and Au nanoparticle-co-modified g-C_(3)N_(4)photocatalysts were synthesized and subsequently applied for the photocatalytic reduction of CO_(2)with H2O under simulated solar *** best photocatalytic performance was demonstrated by the Au and 3%MgO-co-modified g-C_(3)N_(4)photocatalysts with CO,CH_(4),CH3OH,and CH3CHO yields of 423.9,83.2,47.2,and 130.4μmol/g,respectively,in a 3-h *** investigated the effects of MgO and Au as cocatalysts on photocatalytic behaviors,*** characterizations and experimental results showed that the enhanced photocatalytic activity was due to the synergistic effect among the components of the ternary *** cocatalyst MgO can activate CO_(2)(adsorbed at the interface between the MgO and Au particles),and the Mg-N bonds formed in the MgO-CN nanosheets played an important role in the charge ***,the Au particles that were modified into MgO/g-C_(3)N_(4)can increase the absorption of visible light via the surface plasmon resonance effect and further reduce the activation energies of the photoreduction of CO_(2)using *** study provided an effective method for the modification of traditional primary photocatalysts with promising performance for photocatalytic CO_(2)reduction.

关键词： CO2 photoreduction MgO Au g-C3N4 Photocatalysis Synergistic effect Cocatalyst

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：