scispace - formally typeset
Search or ask a question
Institution

Harbin Engineering University

EducationHarbin, Heilongjiang, China
About: Harbin Engineering University is a education organization based out in Harbin, Heilongjiang, China. It is known for research contribution in the topics: Control theory & Microstructure. The organization has 31149 authors who have published 27940 publications receiving 276787 citations. The organization is also known as: HEU.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the nonlinear absorption properties of the MoS2 nanoflake array films were investigated by an open-aperture Z-scan technique, and the results showed that the films exhibited different NLA properties dependent on the input energy.
Abstract: MoS2 nanoflake array films on different glass substrates were fabricated by an in situ growth method The nonlinear absorption (NLA) properties of the MoS2 nanoflake array films were investigated by an open-aperture Z-scan technique The MoS2 nanoflake array films exhibited different NLA properties dependent on the input energy In the case of lower input energy, the films exhibited saturable absorption (SA); however, if the input energy was increased, a changeover from SA to reverse saturable absorption (RSA) was observed The interesting NLA properties of the films could be attributed to the competition between the ground-state absorption and the excited-state absorption in terms of the energy-level model of MoS2

87 citations

Journal ArticleDOI
TL;DR: In this article, a new index for evaluating coal brittleness was established from the perspective of energy evolution during coal failure, and the applicability of the new index and the influence of the confining pressure and cleat orientation on the coal brittleness were analyzed.
Abstract: Evaluating the ability of coal seams to form fracture networks by hydraulic fracturing is important for the development of coalbed methane (CBM) reservoirs. In this paper, a new index for evaluating coal brittleness was established from the perspective of energy evolution during coal failure. Uniaxial and triaxial compression tests of coal monitored by an acoustic emission (AE) system were carried out and the applicability of the new index and the influence of the confining pressure and cleat orientation on the coal brittleness were analyzed. The pre-peak and post-peak dissipated energies were the essential factors in determining the coal brittleness. The new index can characterize the influence of the external stress and cleat orientation on coal brittleness, and can also comprehensively reflect the mechanical properties of the coal during the pre-peak and post-peak stages. The corresponding AE energy curves can be divided into Rapid Fracture Type, Stable Fracture Type and Plastic Fracture Type. For the Rapid Fracture Type, the accumulation rate of AE energy showed sudden changes when reaching the yield stress and peak strength, which represented high brittleness. The Plastic Fracture Type represented low brittleness, and the accumulated AE energy curves were smooth—first concave and then convex. The brittleness index of coal studied in this paper can provide a new method for selecting the optimal CBM reservoir and optimizing the fracturing scheme.

87 citations

Journal ArticleDOI
TL;DR: In this paper, low-cost MgFexMn2-xO4 nanomaterials are prepared by a facile sol-gel method, and optimized MgFe1.33Mn0.67O4 exhibits excellent electrochemical cycling performance and rate capability.

87 citations

Journal ArticleDOI
TL;DR: Experimental results illustrate that the proposed closed- loop approach can estimate the attitude matrix from the current body frame to the initial body frame better than the existing open-loop approach, which results in improved alignment accuracy as compared with the existing optimization-based alignment method for the odometer-aided SINS when the vehicle maneuvers severely.
Abstract: In this paper, the in-motion coarse alignment (IMCA) for odometer-aided strap-down inertial navigation system (SINS) is investigated with the main focus on compensating for the dynamic errors of gyroscope induced by severe maneuvering. A new Kalman-filtering-based IMCA method for an odometer-aided SINS is presented. A novel closed-loop approach to estimating the attitude matrix from the current body frame to the initial body frame is proposed, in which the attitude error between the closed-loop calculation and the true attitude matrix is first estimated, and then, the estimated attitude matrix is obtained by refining the closed-loop calculation with the estimated attitude error. A linear state-space model for the attitude error is derived, and then, a Kalman filter is employed to track the attitude error. Experimental results illustrate that the proposed closed-loop approach can estimate the attitude matrix from the current body frame to the initial body frame better than the existing open-loop approach, which results in improved alignment accuracy as compared with the existing optimization-based alignment method for the odometer-aided SINS when the vehicle maneuvers severely.

87 citations

Journal ArticleDOI
TL;DR: The high-pass property of the AICC device prevents the decoupling design near 2.4GHz affecting the successful operation of GPS at 1.575 GHz and can find plenty of applications in long-term-evolution and future 5G wireless platforms.
Abstract: In this paper, an antenna interference cancellation chip (AICC) with a high-pass response is proposed to mitigate the mutual coupling of two antennas resonating in contiguous frequency bands. Using the most up-to-date low temperature co-fired ceramic (LTCC) technology, the chip only occupies a compact volume of $1.6\times 0.8\times 0.6$ mm3. Two external tuning capacitors and two shunt inductors together with the LTCC AICC device which are in shunt with two coupled antennas, are able to improve the antenna isolation near band-edge by more than 15 dB without sacrificing antenna performance in its useful resonating bands. The high-pass property of the AICC device prevents the decoupling design near 2.4GHz affecting the successful operation of GPS at 1.575 GHz. The superiority of the proposed method is verified with active measurement of a Mi-Fi (mobile Wi-Fi) device in Wi-Fi hotspot mode using the AICC device. The proposed AICC device and corresponding decoupling method with the device can find plenty of applications in long-term-evolution and future 5G wireless platforms.

87 citations


Authors

Showing all 31363 results

NameH-indexPapersCitations
Peng Shi137137165195
Lei Zhang130231286950
Yang Liu1292506122380
Tao Zhang123277283866
Wei Zhang104291164923
Wei Liu102292765228
Feng Yan101104141556
Lianzhou Wang9559631438
Xiaodong Xu94112250817
Zhiguo Yuan9363328645
Rong Wang9095032172
Jun Lin8869930426
Yufeng Zheng8779731425
Taihong Wang8427925945
Mao-Sheng Cao8131424046
Network Information
Related Institutions (5)
Harbin Institute of Technology
109.2K papers, 1.6M citations

95% related

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

90% related

University of Science and Technology of China
101K papers, 2.4M citations

88% related

Tsinghua University
200.5K papers, 4.5M citations

88% related

Northeastern University
58.1K papers, 1.7M citations

87% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023107
2022408
20212,476
20202,484
20192,402
20182,173