检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Cui, Puchang Wang, Yuqi Jia, Changhao Wang, Hongli Bai, Qingqing Zhang, Zhihong Zheng, Huaibei Lai, Zhonghong Liu, Yong Zhu, Jingchuan School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Chengdu Advanced Metal Materials Industrial Technology Institute Co. Ltd. Chengdu610300 China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China Center for Analysis Measurement and Computing Harbin Institute of Technology Harbin150001 China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009 China

The isothermal transformation kinetics and microstructural evolution of the reversed austenite have a significant influence on the properties of PH13-8Mo steel. However, the microscopic phase transformation mechanism during isothermal processes for PH13-8Mo steel needs further examination. Herein, we systematically investigate the isothermal transformation behavior and mechanism of reversed austenite in PH13-8Mo steel. Phase transformation kinetic measurements unravel that the complete elimination of residual austenite can be achieved. Only hierarchical martensitic microstructure without austenite was detected after the solution-cooling treatment at 927 °C with a cooling rate of 10 °C/s, determining the critical martensite start and end temperature to be 176.6 °C, 11.6 °C. The isothermal kinetics of reverted austenite satisfies the Johnson-Mehl-Avrami relationship. The fraction of reversed austenite increases from 0.14% at 510 °C to 8.73% at 593 °C. The lath martensite boundaries with large kernel average misorientation values promote elemental diffusion at the interface. Further, the underlying mechanisms of diffusion-controlled dynamics are elucidated during the isothermal aging process. The interfacial model indicates the growing width of the reversed austenite up to 100 nm and the compositional gradient formed by the elemental diffusion during aging for 0-5 h at 593 °C. The interdiffusion coefficient calculations interpret the diffusion direction of alloying element Ni from martensite to reversed austenite;Cr and Mo may form alloying carbides at the austenite-martensite interface;Al possesses the fastest diffusivity in martensite and austenite phases. The present work unveils the phase transformation kinetics of PH13-8Mo steel, achieving quantitative regulation for maraging stainless steel. © 2023, The Authors. All rights reserved.

关键词： Martensite

来源：评论

学校读者我要写书评

暂无评论

Magnetic shielding of wireless power transfer using zero permeability metamaterial slab 1

Magnetic shielding of wireless power transfer using zero per...

引用

1st IEEE China International Youth Conference on Electrical Engineering, CIYCEE 2020

作者： Lu, Conghui Huang, Xiutao Rong, Cancan Tao, Xiong Zeng, Yingqin Liu, Xiaobo Liu, Minghai Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Aerospace Institute of Advanced Material Processing Technology Beijing100074 China

ISBN: (纸本)9781728196596

Electromagnetic radiation generated by the wireless power transfer (WPT) can be harmful to humans and environment. In order to satisfy the safety requirements, electromagnetic leakage to the nearby transmission channels should be controlled below a safe level. Except for the ferrite and metallic shielding materials, several researchers have put forward the zero-permeability metamaterial (ZP-MM). However, there have been few scientific studies with the application of ZP-MM in four-coil WPT systems. In this paper, we propose an optimized ZP-MM for shielding leaked magnetic field. Next, we setup a miniaturized WPT system loaded with ZP-MM at 13.56MHz. As a result, when ZP-MM is used, the transmission efficiency is reduced about 28.8% and the magnetic field magnitude of the receiver has been decreased about 72.7%, compared to free space. To better highlight the shielding effect, the aluminum plate is inserted in the middle of the Tx and Rx coils. The results show that the shielding effect of ZP-MM is better than aluminum plate. Obviously, the proposed ZP-MM has good performance in magnetic field shielding for WPT systems. © 2020 IEEE.

关键词： Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

In-situ S/TEM Investigations of Domain and Phase Transitions in Polarized Cu2Se

引用

Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Bai, Hui Luo, Hao Yang, Dongwang Wu, Jinsong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Nanostructure Research Center Wuhan University of Technology Wuhan China

来源：评论

学校读者我要写书评

暂无评论

Synergistic Effects of Steel Slag and Wet Grinding on Ambient Cured Ground Granulated Blast Furnace Slag Activated by Sodium Sulfate

SSRN

引用

SSRN 2022年

作者： Li, Yubo Zhang, Quangang Yang, Qifan He, Xingyang Su, Ying Tan, Hongbo Liu, Jing School of Civil Engineering Architecture and Environment Hubei University of Technology Wuhan430070 China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of Technology Wuhan430068 China State Key Laboratory of Silicate Materials for Architecture Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Alkali-activated materials (AAM) has been increasing attract attention for low energy consumption and low emission. Weak base AAM is a potential approach to further reduce energy consumption and environment friendly. However, low early strength and slow strength development due to low alkalinity of the activator limit the application in engineering. In this study, wet grinding was performed to promote the reaction activity of ground granulated blast furnace slag (GGBFS). In order to further accelerate hydration reaction and shorten setting time, steel slag (SS) was used as partial-substitution precursor. Wet-grinded SS-GGBFS (WSS-GS) binary binders activated by sodium sulfate were designed. The propertied of WSS-GS slurry was analyzed by pH values, conductivity and ICP test. The performances of WSS-GS pastes that contained different dosages SS (15%, 30% and 45%) and various activator concentration (1%, 3% and 5% Na2O-E) cured in ambient temperature were explored by rheological properties, setting time, compressive strength, hydration heat, XRD, TG-DTA and SEM-EDS tests. The results showed that the property of WSS-GS slurry was improved by addition of SS, early hydration reaction and compressive strength were promoted greatly. However, excess SS was harmful to strength development in later age for quantity reduction of hydration products and microstructure deterioration. 15%SS-85%GGBFS activated by 3% Na2O-E sodium sulfate was verified with an desired performance, initial setting time was shorten by 60% and 1 d compressive strength was increased by 91%. These results provide guidance on designing of weak base-activated slag system and utilization of mass SS. © 2022, The Authors. All rights reserved.

关键词： Sodium sulfate

来源：评论

学校读者我要写书评

暂无评论

Evolution characteristics of multi-physical fields distributions during the whole life cycle of PEMFC

引用

Chemical Engineering Journal 2025年 518卷

作者： Panxing Jiang Fan Wu WanQiu Yu Zhiping Huang XinHao Huang Zhigang Zhan Shang Li Mu Pan School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China

The membrane electrode assembly (MEA) aging of proton exchange membrane fuel cell (PEMFC) is reflected as its variations in compositions and microstructures, which leads to changes in the distributions of multi-physical fields and the performance of the cell. In this study, we utilized the results of a series of single-cell aging experiments and characterizations to obtain the evolution values of the main material properties during the whole life cycle, and on this basis, we simulated the evolution characteristics of the distributions of multi-physical fields. The main conclusions are as follows: the open-circuit voltage, and the specific active surface area, contact angle in cathode catalyst layer (CCL) generally exhibit a gradual decline during the life cycle, with reduction ratios of 9.6 %, 70.8 %, and 8.3 %, respectively; while the contact resistance and porosity in CCL increase progressively, with the ratios of 16.4 % and 20 %, respectively. Owing to the evolution of the open-circuit voltage and specific active surface area, the value and distribution of the CL local potential vary significantly. In contrast, the gas/water/temperature fields within the cell do not change significantly mainly due to the influence of constant middle current density and other operating conditions. The regions with the highest oxygen concentration and highest local voltage coincide with the region of the most severely aged region and the most clearly leaked point area, which exhibits obvious correlations among nonuniform degradation of MEA, physical field distribution and performance changes throughout the whole life of the fuel cell.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Achieving superior performance in thermoelectric Bi_(0.4)Sb_(1.6)Te_(3.72)by enhancing texture and inducing high-density line defects

引用

Science China materials 2021年第6期64卷 1507-1520页

作者： Junhao Qiu Yonggao Yan Hongyao Xie Tingting Luo Fanjie Xia Lei Yao Min Zhang Ting Zhu Gangjian Tan Xianli Su Jinsong Wu Ctirad Uher Hongyi Jiang Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Chemistry University of NorthwesternEvanstonIllinois 60208United States Nanostructure Research Center Wuhan University of TechnologyWuhan 430070China Department of Physics University of MichiganAnn ArborMichigan 48109United States

Miniaturization of efficient thermoelectric(TE)devices has long been hindered by the weak mechanical strength and insufficient heat-to-electricity conversion efficiency of zone-melted(ZM)***,we successfully prepared a robust high-performance p-type Bi_(0.4)Sb_(1.6)Te_(3.72)bulk alloy by combining an ultrafast thermal explosion reaction with the spark plasma sintering(TER-SPS)*** is observed that the introduced excess Te not only enhances the(00l)-oriented texture to ensure an outstanding power factor(PF)of 5 mW m^(−1)K^(−2),but also induces extremely high-density line defects of up to 10^(11)–10^(12)cm^(−2).Benefiting from such heavily dense line defects,the enhancement of the electronic thermal conductance from the increased electron mobility is fully compensated by the stronger phonon scattering,leading to an evident net reduction in total thermal *** a result,a superior ZT value of~1.4 at 350 K is achieved,which is 40%higher than that of commercial ZM ***,owing to the strengthening of grain refinement and highdensity line defects,the mechanical compressive stress reaches up to 94 MPa,which is 154%more than that of commercial single *** research presents an effective strategy for the collaborative optimization of the texture,TE performance,and mechanical strength of Bi2Te3-based *** such,the present study contributes significantly to the future commercial development of miniature TE devices.

关键词： thermoelectric Bi_(2)Te_(3) texture line defect micro device

来源：评论

学校读者我要写书评

暂无评论

Enhancement of Energy Storage Performance in Lead-Free Barium Titanate Ceramics Via Band Structure Engineering

SSRN

引用

SSRN 2022年

作者： Zhang, Ying Zhang, Ganrong Li, Ang Zhang, Jiahan Zheng, Yingqiu Luo, Guoqiang Tu, Rong Zhang, Jian Shen, Qiang Zhang, Lianmeng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and Engineering Nanjing University Nanjing210093 China

Dielectric capacitors with excellent energy storage performance (ESP) are in great demand in the power electronics industry due to their high power density. For the dielectric materials, the dielectric breakdown strength (BDS) is the key factor to improve ESP, which is the focus and bottleneck of current research, especially in the relaxor ferroelectric (RFE) materials with already low residual polarization (P r ). Here, we propose an innovative design strategy to stimulate the ESP of the BaTiO3 (BT)-based RFE ceramics by band structure engineering. The Ta element is selected to enhance the band gap of doped ceramics, occupying Ti-site in supercell of BT and optimizing the bonds length of Ti-O bond to increase the energy band of Ti 3d states. In this way, the band gap of the doped ceramics is efficiently enhanced from 1.8 eV to 2.22 eV resulting in the large BDS. Prospectively, the highest recoverable energy storage density (W rec ) of 2.85 J/cm3 is obtained at 350 kV/cm and the ultra-high energy efficiency (ղ) of 95.26% is found at 200 kV/cm. Our work reveals the relationship between elements doping in B-site and band structure, being expected to benefit for designing energy storage materials. © 2022, The Authors. All rights reserved.

关键词： Energy storage

来源：评论

学校读者我要写书评

暂无评论

Single-Atom Engineering of Covalent Organic Framework for Photocatalytic H2 Production Coupled with Benzylamine Oxidation

引用

Small 2023年第35期19卷 2301928-2301928页

作者： Xia, Yang Zhu, Bicheng Li, Liuyi Ho, Wingkei Wu, Jinsong Chen, Haoming Yu, Jiaguo The Education University of Hong Kong Tai Po New Territories 999077 Hong Kong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 388 Lumo Road Wuhan430074 China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and Engineering Fuzhou University New Campus Fujian Minhou350108 China State Key Laboratory of Marine Pollution City University of Hong Kong Tat Chee Avenue Kowloon999077 Hong Kong Department of Chemistry National Taiwan University Taipei10617 Taiwan

In photocatalysis, reducing the exciton binding energy and boosting the conversion of excitons into free charge carriers are vital to enhance photocatalytic activity. This work presents a facile strategy of engineering Pt single atoms on a 2D hydrazone-based covalent organic framework (TCOF) to promote H2 production coupled with selective oxidation of benzylamine. The optimised TCOF-Pt SA photocatalyst with 3 wt% Pt single atom exhibited superior performance to TCOF and TCOF-supported Pt nanoparticle catalysts. The production rates of H2 and N-benzylidenebenzylamine over TCOF-Pt SA3 are 12.6 and 10.9 times higher than those over TCOF, respectively. Empirical characterisation and theoretical simulation showed that the atomically dispersed Pt is stabilised on the TCOF support through the coordinated N1-Pt-C2 sites, thereby induing the local polarization and improving the dielectric constant to reach the low exciton binding energy. These phenomena led to the promotion of exciton dissociation into electrons and holes and the acceleration of the separation and transport of photoexcited charge carriers from bulk to the surface. This work provides new insights into the regulation of exciton effect for the design of advanced polymer photocatalysts. © 2023 Wiley-VCH GmbH.

关键词： Oxidation

来源：评论

学校读者我要写书评

暂无评论

Two-dimensional MOF/MOF derivative arrays on nickel foam as efficient bifunctional coupled oxygen electrodes

引用

Chinese Journal of Catalysis 2020年第11期41卷 1754-1760页

作者： Kai Huang Shuai Guo Ruyue Wang Sen Lin Naveed Hussain Hehe Wei Bohan Deng Yuanzheng Long Ming Lei Haolin Tang Hui Wu State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Oxygen electrocatalysis,exemplified by the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),is central to energy storage and conversion technologies such as fuel cells,metal-air batteries,and water ***,highly effective and inexpensive earth-abundant materials are sought after to replace the noble metal-based electrocatalysts currently in ***,metal-organic frameworks(MOFs)and carbon-based MOF derivatives have attracted considerable attention as efficient catalysts due to their exceedingly tunable morphologies,structures,compositions,and ***,we report two-dimensional(2D)MOF/MOF derivative coupled arrays on nickel foam as binder-free bifunctional ORR/OER catalysts with enhanced electrocatalytic activity and *** remarkable electrochemical properties are primarily attributed to fully exposed active sites and facilitated charge-transfer *** coupled and hierarchical nanosheet arrays produced via our growth-pyrolysis-regrowth strategy offer promise in the development of highly active electrodes for energy-related electrochemical devices.

关键词： 2DMOFs Derivative Coupled arrays Binder-free Oxygen electrode

来源：评论

学校读者我要写书评

暂无评论

A novel dopant for spiro-OMeTAD towards efficient and stable perovskite solar cells

引用

Science China materials 2021年第12期64卷 2915-2925页

作者： Zhipeng Lin Jing Li Hengyi Li Yanping Mo Junye Pan Chao Wang Xiao-Li Zhang Tongle Bu Jie Zhong Yi-Bing Cheng Fuzhi Huang Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Energy Materials and Surface Sciences Unit Okinawa Institute of Science and Technology Graduate UniversityOkinawa 904-0495Japan

2,2’,7,7’-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9’-spirobifluorene(spiro-OMeTAD), as the most commonly used hole transport material(HTM), plays a significant role in the normal structured(n-i-p) high-efficiency perovskite solar cells(PSCs). In general, it is prepared by a halogen solvent(chlorobenzene, CBZ) and needs an ion dopant(lithium bis(trifluoromethanesulfonyl)imide, Li-TFSI) to improve its conductivity and hole mobility. However, such a halogen solvent is not environmentally friendly and the widely used LiTFSI dopant would affect the stability of PSCs. Herein, we develop a non-halogen solvent-tetrahydrofuran(THF)-prepared spiro-OMeTAD solution with a new p-type dopant,potassium bis(fluorosulfonyl)imide(K-FSI), to apply into PSCs. By this strategy, high-hole-mobility spiro-OMeTAD film is achieved. Meanwhile, the potassium ions introduced by diffusion into perovskite surface passivate the interfacial defects. Therefore, a hysteresis-free champion PSC with an efficiency of 21.02% is obtained, along with significantly improved stability against illumination and ambient conditions. This work provides a new strategy for HTMs toward hysteresis-free high-efficiency and stable PSCs by substituting dopants.

关键词： perovskite solar cells spiro-OMeTAD K-FSI hysteresis-free

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：