848 research outputs found
Compact polarization diversity Kramers-Kronig coherent receiver on silicon chip
No full textWe design and fabricate a compact silicon photonic integrated circuit (PIC) for polarization diversity heterodyne coherent detection. This PIC integrates two optical gratings for fiber coupling and polarization diversity, two germanium single-ended photodetectors (PDs), and three multimode interferometers (MMIs) for power splitting and optical hybrid. The device is highly compact with a footprint of 0.68mm × 0.9mm. We test this PIC with heterodyne detection experiments of polarization division multiplexed (PDM) 32Gbaud quadrature phase shift keying (QPSK) and 16-ary quadrature amplitude modulation (16QAM) signals. The signal-signal beat interference due to square-law detection is separately mitigated with the Kramers-Kronig (KK) scheme for each of the two orthogonal polarizations. To our best knowledge, we report the first PDM-KK coherent receiver in PIC with a capability of detecting 256Gb/s 16QAM signals, which shows the most compact size among the silicon coherent receivers ever reported
Design and Experimental Validation of a Ducted Counter-rotating Axial-flow Fans System
No full textAn experimental study on the design of counter-rotating axial-flow fans was carried out. The fans were designed using an inverse method. In particular, the system is designed to have a pure axial discharge flow. The counter-rotating fans operate in a ducted-flow configuration and the overall performances are measured in a normalized test bench. The rotation rate of each fan is independently controlled. The relative axial spacing between fans can vary from 17% to 310%. The results show that the efficiency is strongly increased compared to a conventional rotor or to a rotor-stator stage. The effects of varying the rotation rates ratio on the overall performances are studied and show that the system has a very flexible use, with a large patch of high efficient operating points in the parameter space. The increase of axial spacing causes only a small decrease of the efficienc
Identifications of polyphenols and quantification of anthocyanidins in grapes and grape-derived products
No full textPolyphenols in grapes and grape-derived products have attracted public and scientific attention due to their numerous protective roles to human health. A rapid and comprehensive qualitative method was developed to characterize the different classes of polyphenols, such as anthocyanins, flavonols, phenolic acids and flavanols/proanthocyanidins, in grapes and grape-derived products. The detection was achieved by two runs with same HPLC gradient in different MS ionization modes and mobile phase modifiers (positive mode and 0.4% trifluoroacetic acid for anthocyanins and flavonols, negative mode and 0.1% formic acid for phenolic acids and flavanols). Under the optimized LC/MS conditions and based on the analysis of the MS and UV data and in comparison with the authenticated standards, a total of 53 polyphenolic compounds were successfully separated and individually identified including 33 anthocyanins, 12 flavonols, 4 phenolic acids and 4 flavanols/proanthocyanidins. With the method developed, a survey was conducted to qualitatively assess and compare the composition of polyphenols among 29 grapes and grape-derived products. To facilitate the quantitation of the major class of polyphenolic anthocyanidins, a simple and precise acid assisted hydrolysis method was established for the quantitation of anthocyanidins in grape juice samples, grape berries and grape skins using LC/MS. Five most common anthocyanidins of delphenidin, petunidin, cyanidin, malvidin, and peonidin in the hydrolyzed grape extracts were included in the quantification study. The validation of this method showed that the recovery percentages of five anthocyanidins ranged from 98.59 % to 103.20% with the relative standard deviation (RSD) less than 5.03%. The qualitative method provided complete insight into the composition of polyphenols in grapes, and other grape-derived products. This quantitative method provides a rapid and accurate tool to quantitatively study individual anthocyanidin in grapes or grape juice samples for quality control and to facilitate the evaluation and comparison of new commercial grapes or grape juice products in market.M.S.Includes bibliographical referencesby Yanping X
Supplement – Supplemental material for Median Nerve Electrical Stimulation–Induced Changes in Effective Connectivity in Patients With Stroke as Assessed With Functional Near-Infrared Spectroscopy
No full textSupplemental material, Supplement for Median Nerve Electrical Stimulation–Induced Changes in Effective Connectivity in Patients With Stroke as Assessed With Functional Near-Infrared Spectroscopy by Congcong Huo, Xinglou Li, Jing Jing, Yanping Ma, Wenhao Li, Yanqin Wang, Wanlin Liu, Yubo Fan, Shouwei Yue, Yonghui Wang and Zengyong Li in Neurorehabilitation and Neural Repair</p
Fig. 6 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 6. (a) A labeled diagram of a fullbloom Lilium 'Siberia' flower. (b) Pictorial view of Lilium 'Siberia' flowers at different flower developmental stages.Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 7, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
Multiscale asymptotic method for Steklov eigenvalue equations in composite media
No full textAuthor name used in this publication: Yanping Lin2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Fig. 2 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 2. GC-MS analysis of products generated by LoTPS2. (a) GC-MS analysis (total ion chromatogram) of the products obtained by incubating extracts of the empty vector (control) with geranyl pyrophosphate. (b) GC-MS analysis (total ion chromatogram) of the LoTPS2 enzyme with GPP. (c) GC–MS analysis (total ion chromatogram) of the LoTPS2 enzyme with farnesyl pyrophosphate showing (E, E)-α- farnesene as the sole product. (d) Mass spectrum of the peak. (e) Mass spectrum of (E, E)-α-farnesene in the NIST08 library.Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 4, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
Developing finite element methods for maxwell's equations in a cole-cole dispersive medium
No full textAuthor name used in this publication: Yanping Lin2011-2012 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
Fig. 4 in Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia'
No full textFig. 4. Product analysis of LoTPS4 produced from GGPP and FPP. (a) GC-MS analysis (ion chromatogram) of the LoTPS4 enzyme product from GGPP. (b) GC-MS analysis (ion chromatogram) of products obtained from assays with LoTPS4 and FPP. (c, d, e, f) Mass spectra of Peak 1, Peak 2, Peak 3 and Peak 4. Di-epi-α-cedrene (Peak 1), α-cubebene (Peak 2): trans-α-bergamotene (Peak 3) and (E)-β-farnesene (Peak 4).Published as part of Abbas, Farhat, Ke, Yanguo, Zhou, Yiwei, Ashraf, Umair, Li, Xinyue, Yu, Yunyi, Yue, Yuechong, Ahmad, Kanwar Waqas, Yu, Rangcai & Fan, Yanping, 2020, Molecular cloning, characterization and expression analysis of LoTPS2 and LoTPS4 involved in floral scent formation in oriental hybrid Lilium variety 'Siberia', pp. 1-13 in Phytochemistry (112294) 173 on page 6, DOI: 10.1016/j.phytochem.2020.112294, http://zenodo.org/record/829450
Multiscale asymptotic method for Maxwell's equations in composite materials
No full textAuthor name used in this publication: Yanping Lin2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
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