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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
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Journal ArticleDOI
TL;DR: In this paper, the utilization of skarn-type copper tailings to prepare autoclaved aerated concrete (AAC) was studied based on the background that large amount of copper tailsings are stockpiled in China.

131 citations

Journal ArticleDOI
15 Mar 2016
TL;DR: A localization system for quadcopters based on ultra-wideband (UWB) range measurements is established and the position and velocity estimates produced by the algorithm will be further fed to the control loop to aid the navigation of the quadcopter.
Abstract: Micro unmanned aerial vehicles (UAVs) are promising to play more and more important roles in both civilian and military activities. Currently, the navigation of UAVs is critically dependent on the localization service provided by the Global Positioning System (GPS), which suffers from the multipath effect and blockage of line-of-sight, and fails to work in an indoor, forest or urban environment. In this paper, we establish a localization system for quadcopters based on ultra-wideband (UWB) range measurements. To achieve the localization, a UWB module is installed on the quadcopter to actively send ranging requests to some fixed UWB modules at known positions (anchors). Once a distance is obtained, it is calibrated first and then goes through outlier detection before being fed to a localization algorithm. The localization algorithm is initialized by trilateration and sustained by the extended Kalman filter (EKF). The position and velocity estimates produced by the algorithm will be further fed to the control loop to aid the navigation of the quadcopter. Various flight tests in different environments have been conducted to validate the performance of UWB ranging and localization algorithm.

131 citations

Journal ArticleDOI
TL;DR: The nf-BC/SA hybrid hydrogels with dual pH- and electro-response were new promising candidates as controlled drug delivery systems and could be interpreted by the superposition of both Fickian diffusion and case-II transport based on Peppas' semi-empirical equation.
Abstract: In this work, hybrid hydrogels composed of bacterial cellulose nanofibers (nf-BC) and sodium alginate (SA) were prepared as a dual-stimuli responsive release system. The pH and electric field stimulus-responsive swelling properties and the stimulus-responsive drug release behaviors of the nf-BC/SA hybrid hydrogels using Ibuprofen as a model drug, were investigated in vitro. As the pH changed from 1.5 to 11.8, the swelling ratio increased from less than 8 times compared with its dry weight at acidic conditions to more than 13 times when the pH value was 11.8. When the electric field changed from 0 to 0.5 V, the hybrid hydrogels also showed an increasing swelling ratio from 8 times to 14 times their dry weight. The release of Ibuprofen (IBU) could be controlled by the action of deprotonation or protonation of calcium alginate in the hydrogels under different pH conditions, faster in alkaline conditions and slower in acidic conditions. Furthermore, the drug release from the hybrid hydrogels could be enhanced with an applied electric stimulus. The drug release mechanism under pH and applied electric field could be interpreted by the superposition of both Fickian diffusion and case-II transport based on Peppas' semi-empirical equation. The nf-BC/SA hybrid hydrogels with dual pH- and electro-response were new promising candidates as controlled drug delivery systems.

131 citations

Journal ArticleDOI
TL;DR: In this article, the authors give a tutorial of the platform configuration, methodology of modeling, comprehensive nonlinear model, the aerodynamic effects, and model identification for a quadrotor.
Abstract: A quadrotor is a rotorcraft capable of hover, forward flight, and VTOL and is emerging as a fundamental research and application platform at present with flexibility, adaptability, and ease of construction. Since a quadrotor is basically considered an unstable system with the characteristics of dynamics such as being intensively nonlinear, multivariable, strongly coupled, and underactuated, a precise and practical model is critical to control the vehicle which seems to be simple to operate. As a rotorcraft, the dynamics of a quadrotor is mainly dominated by the complicated aerodynamic effects of the rotors. This paper gives a tutorial of the platform configuration, methodology of modeling, comprehensive nonlinear model, the aerodynamic effects, and model identification for a quadrotor.

131 citations

Journal ArticleDOI
TL;DR: By simple recrystallization, the catalytic activity of deactivated species can be recovered from the isolation yield 46% to 92% for 4-bromobenzonitrile conversion at the same conditions, revealing the great application potentials of HOF-based catalysts.
Abstract: Hydrogen-bonded organic framework (HOF)-based catalysts still remain unreported thus far due to their relatively weak stability. In the present work, a robust porous HOF (HOF-19) with a Brunauer-Emmett-Teller surface area of 685 m2 g-1 was reticulated from a cagelike building block, amino-substituted bis(tetraoxacalix[2]arene[2]triazine), depending on the hydrogen bonding with the help of π-π interactions. The postsynthetic metalation of HOF-19 with palladium acetate afforded a palladium(II)-containing heterogeneous catalyst with porous hydrogen-bonded structure retained, which exhibits excellent catalytic performance for the Suzuki-Miyaura coupling reaction with the high isolation yields (96-98%), prominent stability, and good selectivity. More importantly, by simple recrystallization, the catalytic activity of deactivated species can be recovered from the isolation yield 46% to 92% for 4-bromobenzonitrile conversion at the same conditions, revealing the great application potentials of HOF-based catalysts.

131 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
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023161
2022807
20214,662
20204,369
20194,164
20183,586