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A Two-stage CMOS Integrated Highly Efficient Rectifier for Vibration Energy Harvesting Applications
Li, Qiang,Wang, Jing,Niu, Dan,Inoue, Yasuaki The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.4
We report, in this paper, a highly efficient CMOS rectifier for low power energy harvesting system. By using two-stage structure and a novel active diode, the rectifier can work at a wide range of input voltage amplitudes of 0.45V up to 1.8V under a standard 0.18um CMOS process. A comparator that consists of common-gate stage and control stage is designed to control the switch of the active diode. The proposed rectifier can achieve a peak voltage conversion efficiency of over 96% and a power efficiency over 90%. Simulated power consumption of the rectifier is 197nW at 450mV, which is about 30% smaller than the best recently published results.
FORMATION AND ELIMINATION OF TWINNED SHEETS STRUCTIJRE IN CZ TERFENOL SINGLE CRYSTALS
Li, Qiang,Chang, Y.L.,Ouyang, S.X. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.1
The twinned sheets structure, which is believed that is heplful for its strength but harmful for its magnetostriction, generally exists in the micro structure of Terfeno-D. In order to prepare the twinned sheets free terfenol single crystals, a method of growth with magnetic levitation cold crucible in CZ(Czocharalski) technique has been explored successfully. In this paper, we will discuss the formation of the twinned sheets defects according to the pusedo binary phase diagram of R(Tb, Dy)--Fe and the crystallization beheavior of RFe2 Laves phase. Micro structures of the CZ terfenol crystals are observed by SEM techniques. The influences of growth conditions and precursor alloy compositions on the structures and magnetostriction of CZ terfenol single crystals alos have been consdiered.
Traditional Sports from a Harmonious Perspective
Zhang Liqiang(Liqiang Zhang),Li Liqiang(Liqiang Li),Zhang Junxiao(Junxiao Zhang) 아시아사회과학학회 2022 International Science Research Vol.2 No.3
Traditional sports is an indispensable part of the Chinese excellent history and culture. Harmonious development is the core essence of Chinese culture. Harmony promotes the inheritance and development of the Xizang traditional sports, builds a harmonious Xizang society, and smoothly realizes the Chinese Dream.
Model test study of the influence of rainfall intensity and soil permeability on slope instability
Liqiang Qu,Qiang Du,Jialin Xue 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.7
Rainfall intensity and slope soil permeability influence rainfall infiltration and therefore play an important role in deciding the failure mode of rainfall-induced landslides. To investigate the combined effect of rainfall intensity and soil permeability on slope failure mechanisms, a total of 23 model slope tests were performed. Four different sands with permeabilities spanning two orders of magnitude were used to form the sand slope and artificial rainfalls with 9 different intensities were simulated with a calibrated raining device. A combination of photography and soil moisture content measurements was adopted to study the mechanisms of different modes of slope failures occurred within the test series. It is shown that the failure mode of slope transits from retrogressive failure to surface slide and to flow slide with the increase of rainfall intensity. Because rainfall largely transformed to surface runoff in tests with very small slope permeability (e.g., <7 × 10−6 m/s), these slopes failed due to surface scour and erosion. Except for these tests where surface runoff was dominant, the failure mode of soil slope is controlled by the soil resistance to shearing and flow when the failure occurs, which is in turn controlled by the water content reached in the main slope body at the onset of failure (f) and the soil water characteristics. f increases with the increase of rainfall intensity and the decrease of soil permeability.