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Phase Noise Self-Cancellation Scheme Based on Orthogonal Polarization for OFDM System
( Yao Nie ),( Chunyan Feng ),( Fangfang Liu ),( Caili Guo ),( Wen Zhao ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.9
In orthogonal frequency-division multiplexing (OFDM) systems, phase noise introduced by the local oscillators can cause bit error rate (BER) performance degradation. To solve the phase noise problem, a novel orthogonal-polarization-based phase noise self-cancellation (OP-PNSC) scheme is proposed. First, the efficiency of canceling the phase noise of the OP-PNSC scheme in the AWGN channel is investigated. Then, the OP-PNSC scheme in the polarization-dependent loss (PDL) channel is investigated due to power imbalance caused by PDL, and a PDL pre-compensated OP-PNSC (PPC -OP-PNSC) scheme is proposed to mitigate the power imbalance caused by PDL. In addition, the performance of the PPC-OP-PNSC scheme is investigated, where the signal-to-interference-plus-noise ratio (SINR) and spectral efficiency (SE) performances are analyzed. Finally, a comparison between the OP-PNSC and polarization diversity scheme is discussed. The numerical results show that the BER and SINR performances of the OP-PNSC scheme outperform the case with the phase noise compensation and phase noise self-cancellation scheme.
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Bing He,Yao Chen,Hua Zhang,Chunyan Xia,Qing Zhang,Wei Lin 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.4
Light intensity and quality affect photosynthesis, plant morphology, and the synthesis of primary and secondary metabolites. Dysosma versipellis (Hance) M. Cheng is an endangered species endemic to China, and a highly valued medicinal and ornamental plant. In this study, we discuss the effects of different light spectrums conferred by colored plastic films on photosynthesis and the contents of active ingredients of D. versipellis. D. versipellis plants were cultured for 90 days under white, red, yellow, or blue film. The blue film treatment generally increased the chlorophyll content, photosynthetic rate (Pn), maximal photochemical efficiency of PSII (Fv/Fm), actual photochemical efficiency of PSII (ФPSII), photochemical quenching (qP), and the podophyllotoxin content of the rhizomes. The blue film treatment also decreased the maximum net photosynthetic rate (Amax), apparent photosynthetic quantum efficiency (AQY), and podophyllotoxin contents of the stems. The yellow film treatment resulted in a decline of the Amax, AQY, Fv/Fm, ФPSII, qP, chlorophyll contents, and podophyllotoxin contents of the leaves and rhizomes; however, the light compensation point (LCP), light saturation point, and minimum fluorescence (Fo) were increased. There were no significant differences in chlorophyll content, Amax, LCP, AQY, Fv/Fm, ФPSII, or qP between the white and red film treatments. These results suggest that in D. versipellis, blue film treatments promote photosynthesis and the accumulation of podophyllotoxin, while yellow film treatments inhibit photosynthesis and the accumulation of podophyllotoxin.
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Haifeng Ding,Dongsheng Ma,Chunyan Yao,Qizhong Lin,Linhai Jing 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.1
The Neoproterozoic successions in the Aksu region, NW China, which lies unconformably on the Precambrian Aksu Group basement, comprises the Qiaoenbrak, Yuermeinak, Sugetbrak, and Chigebrak formations (from bottom to top). The two lowermost units include two distinct glacial diamictites, which indicate distinct episodes of glaciations. We report the major and trace element (including rare earth element) data for the Qiaoenbrak, Yuermeinak, and Sugetbrak formations to identify the paleoclimatic perturbations. The chemical index of alteration (CIA) values show variations from Qiaoenbrak to Yuermeinak, then Sugetbrak formations. The diamictites have relatively lower chemical index of alteration values (45.23–59.64) than inter-, post- and non-glacial sediments (48.28–66.96). This result supported the condition that the diamictites underwent relatively weak chemical weathering from a dry-cold sedimentary environment, which is associated with the sedimentary facies description. The lower Neoproterozoic successions recoded at least two glaciations, one is Qiaoenbrak glaciation and the other is Yuermeinak glaciation.
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Chunna Liu,Huijiao Lin,Liu Jiawei,Yao Wang,Chunmei Wang,Jinghui Sun,Chunyan Yu,Ying Dong,Wenyue Zhuang,Shu Jing,JianGuang Chen,He Li 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.8
Free radical accumulation in the body will cause oxidative stress damages including the renal damage. Schisandrae Sphenantherae Fructus (Schisandra), a traditional Chinese herbal medicine, has been used throughout the world. Anwulignan, a monomer extracted from Schisandra, has been shown in our previous studies to possess antioxidant and protective effects on the liver, brain and spleen damages in the aging mice. However, its effect on the renal damage caused by aging is not clear. This study showed that anwulignan could significantly increase the kidney index, the creatinine clearance, the activities of superoxide dismutase, catalase and glutathione peroxidase; reduce the urinary protein concentration, the serum urea nitrogen and creatinine content, the content of malondialdehyde and 8-hydroxylated deoxyguanosine in the renal tissue; and improve the renal tissue damage. Moreover, anwulignan increased the production of Nrf2, HO-1 and NQO1 proteins and decreased the production level of Keap1 protein in the renal tissue in the D-galactose induced aging mice. These results suggest that anwulignan significantly alleviates the renal damage by its antioxidant effect through regulating the production of Nrf2/ARE pathway-related proteins in the renal tissue in the D-galactose induced aging mice.
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