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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.
Liqiang Wang,Yong Wang,Wangxiu Danzhen,Daihai Ma 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.2
The Kenbale Cu mineralization occurrence related to the diorite is a newly discovered Cu mineralization event in the Bangong-Nujiang metallogenic belt, Tibet, China. The Cu mineralization is hosted in the contact between the monzogranite or biotite quartz diorite and the fine-grained diorite, which is the mineralization related intrusion. In order to constrain the Kenbale mineralization age, petrogenesis and tectonic setting, we conducted LA-ICP-MS zircon U-Pb dating and Hf isotopic analyses of the biotite quartz diorite and fine-grained diorite and also the whole-rock geochemical study of the biotite quartz diorite. Zircon UPb dating show that weighted mean 206Pb/238U ages of the biotite quartz diorite and fine-grained diorite are 123.5 ± 1.9 Ma (MSWD = 2.3, n = 16) and 118.9 ± 1.3 Ma (MSWD = 2.5, n = 18), respectively. The biotite quartz diorite is a high-K calc-alkaline I-type magma rock and was controlled mainly by partial melting process during the magma formation and evolution. This intrusion is characterized by positive εHf(t) values (2.6 to 5.8) and old Hf crustal model ages (813 to 1016 Ma), indicating that the magma was sourced from partial melting of the Mesoproterozoic to Neoproterozoic juvenile crust of the northern Lhasa Terrane. Compared with the biotite quartz diorite, the mineralization associated fine-grained diorite has much higher zircon εHf(t) values (8.2 to 11.4) and younger Hf crustal model ages (450 to 650 Ma). These characteristics are similar with those of the coeval magmatic rocks induced by slab break-off of the southward subducted Bangong-Nujiang Ocean. The geochronology and geochemical results show that the Kenbale Cu mineralization was controlled by the slab break-off of the southward subducted Bangong-Nujiang Ocean.