scispace - formally typeset
Search or ask a question
Institution

University of Science and Technology Beijing

EducationBeijing, China
About: University of Science and Technology Beijing is a education organization based out in Beijing, China. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 41558 authors who have published 44473 publications receiving 623229 citations. The organization is also known as: Beijing Steel and Iron Institute.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a multilayer-structured 0-3 nanocomposite was proposed to achieve high energy densities and low dielectric losses in modern electronic and electrical power systems.
Abstract: Dielectric materials with high electric energy densities and low dielectric losses are of critical importance in a number of applications in modern electronic and electrical power systems. An organic–inorganic 0–3 nanocomposite, in which nanoparticles (0-dimensional) are embedded in a 3-dimensionally connected polymer matrix, has the potential to combine the high breakdown strength and low dielectric loss of the polymer with the high dielectric constant of the ceramic fillers, representing a promising approach to realize high energy densities. However, one significant drawback of the composites explored up to now is that the increased dielectric constant of the composites is at the expense of the breakdown strength, limiting the energy density and dielectric reliability. In this study, by expanding the traditional 0–3 nanocomposite approach to a multilayered structure which combines the complementary properties of the constituent layers, one can realize both greater dielectric displacement and a higher breakdown field than that of the polymer matrix. In a typical 3-layer structure, for example, a central nanocomposite layer of higher breakdown strength is introduced to substantially improve the overall breakdown strength of the multilayer-structured composite film, and the outer composite layers filled with large amount of high dielectric constant nanofillers can then be polarized up to higher electric fields, hence enhancing the electric displacement. As a result, the topological-structure modulated nanocomposites, with an optimally tailored nanomorphology and composite structure, yield a discharged energy density of 10 J/cm3 with a dielectric breakdown strength of 450 kV mm–1, much higher than those reported from all earlier studies of nanocomposites.

354 citations

Journal ArticleDOI
TL;DR: The effects of elasticity number, slip coefficient, the relaxation time of the heat flux and the Prandtl number on velocity and temperature fields are analyzed and a comparison of Fourier's Law and the Cattaneo–Christov heat flux model is presented.

354 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a theoretical and experimental study on thermal conductivities of silica aerogel, xonotlite-type calcium silicate, and xonotonite-aerogel composite insulation material.

353 citations

Journal ArticleDOI
TL;DR: Wang et al. as discussed by the authors used structural equation modeling (SEM) to examine the direct and indirect relationships among caring climate, job satisfaction, organizational commitment, and job performance of 476 employees working in a Chinese insurance company.
Abstract: This research uses structural equation modeling (SEM) to examine the direct and indirect relationships among caring climate, job satisfaction, organizational commitment, and job performance of 476 employees working in a Chinese insurance company. The SEM result showed that caring climate had a significant direct impact on job satisfaction, organizational command, and job performance. Caring climate also had a significant indirect impact on organizational commitment through the mediating role of job satisfaction, and on job performance through the mediating role of job satisfaction and organizational commitment. In addition, job satisfaction had significant direct impact on organizational commitment, through which it also had a significant indirect impact on job performance. Finally, organizational commitment had a significant direct impact on job performance.

353 citations

Journal ArticleDOI
TL;DR: In this article, the effect of MnO2 structure on ozone decomposition has been investigated, and three tunnel-structure polymorphs, i.e., α-, β- and γ-MnO2 were prepared and characterized by BET, TEM, XRD, H2-TPR, O2TPD, NH3-TPD and TGA-MS and XPS.
Abstract: Ozone is a ubiquitous pollutant and manganese dioxide (MnO2) has been widely used for ozone decomposition. However, the effect of MnO2 structure on ozone decomposition has never been investigated. Three tunnel-structure polymorphs, i.e., α-, β- and γ-MnO2 were prepared and characterized by BET, TEM, XRD, H2-TPR, O2-TPD, NH3-TPD, TGA-MS and XPS. The activity of three MnO2 polymorphs for ozone decomposition followed the order of α- > γ- > β-MnO2. The α-MnO2 owned the largest specific surface area and lowest average oxidation state of Mn. Furthermore, the adsorbed oxygen species on the surface of α-MnO2 were more easily reduced. In-situ Raman spectroscopy results showed that peroxide species formed during ozone decomposition, and over α-MnO2 they were more easily decomposed by increasing reaction temperature. It was found that the catalytic activity of MnO2 strongly depended on the density of oxygen vacancies. Accordingly, the ozone decomposition mechanism based on the involvement and recycling of oxygen vacancy (VO) is proposed. The decomposition of peroxide species is a rate-limiting step. These findings are helpful for designing more effective catalyst for ozone removal.

352 citations


Authors

Showing all 41904 results

NameH-indexPapersCitations
Zhong Lin Wang2452529259003
Yang Yang1712644153049
Jun Chen136185677368
Jun Lu135152699767
Jie Liu131153168891
Shuai Liu129109580823
Jian Zhou128300791402
Chao Zhang127311984711
Shaobin Wang12687252463
Tao Zhang123277283866
Jian Liu117209073156
Xin Li114277871389
Jianhui Hou11042953265
Hong Wang110163351811
Baoshan Xing10982348944
Network Information
Related Institutions (5)
Harbin Institute of Technology
109.2K papers, 1.6M citations

93% related

Northeastern University
58.1K papers, 1.7M citations

92% related

Dalian University of Technology
71.9K papers, 1.1M citations

92% related

Beihang University
73.5K papers, 975.6K citations

91% related

South China University of Technology
69.4K papers, 1.2M citations

91% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023161
2022807
20214,662
20204,369
20194,164
20183,586