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635 results on '"Zhou, Dayong"'

202. Variable Temperature Nuclear Magnetic Resonance and Magnetic Resonance Imaging System as a Novel Technique for In Situ Monitoring of Food Phase Transition

Author

Song, Yukun, Cheng, Shasha, Wang, Huihui, Zhu, Bei-Wei, Zhou, Dayong, Yang, Peiqiang, and Tan, Mingqian

Abstract

A nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) system with a 45 mm variable temperature (VT) sample probe (VT-NMR-MRI) was developed as an innovative technique for in situ monitoring of food phase transition. The system was designed to allow for dual deployment in either a freezing (−37 °C) or high temperature (150 °C) environment. The major breakthrough of the developed VT-NMR-MRI system is that it is able to measure the water states simultaneously in situ during food processing. The performance of the VT-NMR-MRI system was evaluated by measuring the phase transition for salmon flesh and hen egg samples. The NMR relaxometry results demonstrated that the freezing point of salmon flesh was −8.08 °C, and the salmon flesh denaturation temperature was 42.16 °C. The protein denaturation of egg was 70.61 °C, and the protein denaturation occurred at 24.12 min. Meanwhile, the use of MRI in phase transition of food was also investigated to gain internal structural information. All these results showed that the VT-NMR-MRI system provided an effective means for in situ monitoring of phase transition in food processing.

Published
2024
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203. Study on 2.05 eV Al0.13GaInP sub-cell and its hetero-structure cells

Author

Sun Lijie, Xinyi Li, Zhang Jianqin, Wei Zhang, Kaijian Chen, Zhou Dayong, and Lu Hongbo

Subjects
Materials science, Passivation, business.industry, Spectral response, Heterojunction, Epitaxy, law.invention, Metal, law, visual_art, Solar cell, visual_art.visual_art_medium, Optoelectronics, Quantum efficiency, business
Abstract

5-junction solar cells with 2.05 eV top sub-cells are the most promising structure to achieve the conversion efficiencies beyond 36% (AM0, 25°C). Al0.13GaInP (Eg≈ 2.05eV) sub-cell is grown by metal organic vapor-phase epitaxy (MOPVE), presenting an efficiency of 10.04% with 1457.3 mV in Voc and 11.9 mA/cm2 in Isc (AM0, 25°C). External quantum efficiency (EQE) of the sub-cell reveals the poor AlInP/Al0.13GaInP interface passivation, therefore the Isc of the sub-cell is limited. GaInP/Al0.13GaInP het-ero-structure is employed to improve the IV charac-teristics, especially the Isc, by enhancing the spectral response of the long-wavelength region, and further to improve the overall Isc of the 5-junction solar cell. Preliminary GaInP/Al0.13GaInP sub-cell shows en-hanced efficiency of 10.16%, with the Isc increased to 12.6 mA/cm2 and the Voc decreased to 1398.12 mV.

Published
2014

208. Government-driven university-industry linkages in an emerging country: the case of China

Author

Su, D., Zhou, Dayong, Liu, C., Kong, L., Su, D., Zhou, Dayong, Liu, C., and Kong, L.

Abstract

Purpose – The purpose of this paper is to analyze and summarize the development of science and technology (S & T) policies in China from a government-driven perspective in chronological order. To develop knowledge-based economy, China enacts a range of S & T policies since “Reform and Open Policy” started in 1978. Furthermore, it investigates the overall effects of these S & T policies on university-industry linkages (UILs). Design/methodology/approach – This paper conducts an analysis framework of S & T policies in historical sequence to explain how government drives UILs to stimulate technological progress and economic growth in China. Findings – More than a site for high-quality workforce education and knowledge spread, universities as an important part of national innovation are required to participate in economic activities. Considering that most Chinese universities are national, S & T policies with particular regard to university technology transfer would be more important and essential. This research finds that S & T policies enacted by government have made critical contributions to UILs in economic transition period, such as improving academic faculty, enhancing university–industry collaborations and supporting university spin-off formation. The experiences of China suggest that government should enact more effective S & T policies in the knowledge-based economy era. Practical implications – First, universities need to educate high-level human resources that are important for economic growth and social development. Second, universities need to engage in R & D activities and enhance their collaboration with industries, such as consulting services, research contracts with industry, patent licensing and other general knowledge commercial mechanisms. Third, universities also can directly transfer commercial knowledge to start up new businesses by itself or in partnership with industrial sectors. Without doubt, a series of S & T policies or programs enacted by C

Published
2015

210. Assessment and Optimization of Pedestrian Head Impact Safety Performance for a SUV Car

Author

Wang Chun, Ma Fangwu, Lv Xiaojiang, Zhou Dayong, Liu Weiguo, and Zhao Fuquan

Subjects
Protocol (science), Engineering, business.industry, Head impact, Structure design, Fender, Mechatronics automation, Pedestrian, Performance improvement, Automotive safety, business, Automotive engineering
Abstract

Based on evaluation procedures of pedestrian protection (Euro-New car Assessment Program, Euro-NCAP), using CAE (Computer-Aided Engineering) and physical test, the pedestrian head impact safety performance was evaluated. Detailed analysis was done for Key factor which affect the performance of pedestrian head impact. The structure design optimization was performed of the front-end, including Hood, Fender and Cowl top for a SUV car. The final assessment results show that the optimized front-end structure meet the requirements of Euro-NCAP pedestrian protocol, in favor of the pedestrian protection performance improvement. Thereby, the paper provides best reference for the front-end structure design on SUV Cars.

Published
2013

211. Characterization of lipid profiles in different body parts of Asterias amurensis.

Author

ZHOU Dayong, ZHOU Xin, LIU Xiaoyang, SHEN Yan, and YU Zhuoliang

Abstract

The lipid class composition, fatty acid composition, phosphatidylcholine (PC) and phosphatidylethanolamine (PE) contents and phospholipid molecular species in different body parts of Asterias amurensis were determined. The results showed that the lipids contains higher levels of long chain omega-3 polyunsaturated fatty acids (n-3 LC-PUFA) (accounts for 49.53%-57.35% of total fatty acids) and polar lipid (accounts for 73.70%-86.69% of total lipids). Phospholipids (PLs) in polar lipids of Asterias amurensis are mainly composed of PC and PE. The qualitative and quantitative analysises of the composition of phospholipid molecular species were carried out by mass spectrometry. Seventy-seven kinds of phospholipid species mainly contained PUFA were obtained, in which the content of eicosapentaenoic acid (EPA) was particularly rich. The results indicated Asterias amurensis are rich in functional lipids, which have important nutritional value. It is a potential source of materials for health-promoting food ingredients. [ABSTRACT FROM AUTHOR]

Published
2018
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214. Erratum: Corrigendum: Fast native-SAD phasing for routine macromolecular structure determination

Author

Weinert, Tobias, primary, Olieric, Vincent, additional, Waltersperger, Sandro, additional, Panepucci, Ezequiel, additional, Chen, Lirong, additional, Zhang, Hua, additional, Zhou, Dayong, additional, Rose, John, additional, Ebihara, Akio, additional, Kuramitsu, Seiki, additional, Li, Dianfan, additional, Howe, Nicole, additional, Schnapp, Gisela, additional, Pautsch, Alexander, additional, Bargsten, Katja, additional, Prota, Andrea E, additional, Surana, Parag, additional, Kottur, Jithesh, additional, Nair, Deepak T, additional, Basilico, Federica, additional, Cecatiello, Valentina, additional, Pasqualato, Sebastiano, additional, Boland, Andreas, additional, Weichenrieder, Oliver, additional, Wang, Bi-Cheng, additional, Steinmetz, Michel O, additional, Caffrey, Martin, additional, and Wang, Meitian, additional

Published
2015
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218. Fast native-SAD phasing for routine macromolecular structure determination

Author

Weinert, Tobias, primary, Olieric, Vincent, additional, Waltersperger, Sandro, additional, Panepucci, Ezequiel, additional, Chen, Lirong, additional, Zhang, Hua, additional, Zhou, Dayong, additional, Rose, John, additional, Ebihara, Akio, additional, Kuramitsu, Seiki, additional, Li, Dianfan, additional, Howe, Nicole, additional, Schnapp, Gisela, additional, Pautsch, Alexander, additional, Bargsten, Katja, additional, Prota, Andrea E, additional, Surana, Parag, additional, Kottur, Jithesh, additional, Nair, Deepak T, additional, Basilico, Federica, additional, Cecatiello, Valentina, additional, Pasqualato, Sebastiano, additional, Boland, Andreas, additional, Weichenrieder, Oliver, additional, Wang, Bi-Cheng, additional, Steinmetz, Michel O, additional, Caffrey, Martin, additional, and Wang, Meitian, additional

Published
2014
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219. Threshold current density and emitting wavelength evolution with stack number in InAs quantum dash lasers at 1.55 μm

Author

Zhou, Dayong, Piron, Rozenn, Grillot, Frederic, Dehaese, Olivier, Homeyer, Estelle, Batte, Thomas, Tavernier, Karine, Macé, Erwan, Even, Jacky, Le Corre, Alain, Loualiche, Slimane, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne

Subjects
Condensed Matter::Materials Science, threshold current density, InP (100) substrate, molecular beam epitaxy, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Optics, wavelength 1.55 µm, Quantum dash laser
Abstract

International audience; The authors demonstrate the achievement of InAs quantum dash lasers grown by molecular beam epitaxy (MBE) on InP (100) substrate. The lasers exhibit lasing wavelength at 1.55 µm by multiple stacked dash layers from two to five, with ground state lasing at room temperature. The threshold current density reaches a minimum value of 683 A/cm² from double quantum dash structure, resulting from the trade-off between the low number of carrier requirement in the InAs active region and the reduction of carrier concentration in the optical waveguide.

Published
2008

220. 1.55 µm room-temperature continuous wave operation of InAs/InP (100) quantum dash ridge lasers

Author

Piron, Rozenn, Zhou, Dayong, Dontabactouny, Madhoussoudhana, Dehaese, Olivier, Batte, Thomas, Tavernier, Karine, Grillot, Frederic, Le Corre, Alain, Loualiche, Slimane, Boyer, Soline, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic
Abstract

International audience; We report the achievement of a 1.55 µm RT continuous wave (CW) operation of InAs/InP(100) quantum dash ridge lasers. The threshold current reaches a value of 95 mA. The maximum output power and the external efficiency are respectively 2.5 mW and 0.07 W/A per facet for a cavity with 1 mm length and 4 µm wide.

Published
2008

221. A Novel Multiplierless Hardware Implementation Method for Adaptive Filter Coefficients

Author

Linda S. DeBrunner, Yunhua Wang, Victor DeBrunner, and Zhou. Dayong

Subjects
Adaptive filter, Canonical signed digit, business.industry, Computer science, business, Field-programmable gate array, Throughput (business), AND gate, Computer hardware, Digital signal processing
Abstract

Adaptive filter implementations require real-time conversion of coefficients to canonical signed digit (CSD) or similar representations to benefit from multiplierless techniques for implementing filters. Multiplierless approaches are used to reduce the hardware and increase the throughput. This paper introduces a novel hardware implementation method that converts two's complement numbers to their CSD representations using a fixed number of shift and logic operations. As a result, we can greatly reduce the power consumption and area requirements for hardware implementation of DSP algorithms in which coefficients are not known a priori. Because all CSD digits are produced simultaneously, the conversion speed and thus the throughput are improved when compared to overlap-and-scan techniques such as Booth's recoding.

Published
2007

228. Changes in Lipid Profiles of Dried Clams (Mactra chinensis Philippiand Ruditapes philippinarum) during Accelerated Storage and Prediction of Shelf Life

Author

Xie, Hongkai, Zhou, Dayong, Hu, Xiaopei, Liu, Zhongyuan, Song, Liang, and Zhu, Beiwei

Abstract

To predict the shelf life through an Arrhenius model and evaluate the changes in lipid profiles, two types of dried clams were stored at 50 and 65 °C and collected periodically for analysis. The predicted shelf life values of the two dried clam samples were 530 ± 14 and 487 ± 24 h (24 °C), and the relative errors between the actual and predicted values were 5.7 and 6.8%, respectively. During accelerated storage, the peroxide value, p-anisidine value, thiobarbituric acid-reactive substances value, total oxidation value, acid value, and free fatty acid content all increased, while the levels of triacylglycerol, phosphatidylcholine, phosphatidylethanolamine, major glycerophospholipid molecular species, and polyunsaturated fatty acid (PUFA) decreased. Moreover, content of phospholipid containing PUFA decreased significantly than that of triacylglycerol containing PUFA. Results indicated that the Arrhenius model was suitable for the shelf life prediction of dried clams and accelerated storage caused loss in quality of dried clams in terms of lipids.

Published
2018
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229. A 2.05 eV AlGaInP sub-cell used in next generation solar cells

Author

Shi Mengqi, Zhou Dayong, Lu Hongbo, Sun Lijie, Zhang Wei, Chen Kaijian, and Li Xinyi

Subjects
Materials science, business.industry, Heterojunction, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, law.invention, Surface coating, Solar cell efficiency, law, Solar cell, Materials Chemistry, Optoelectronics, Quantum efficiency, Metalorganic vapour phase epitaxy, Electrical and Electronic Engineering, business, Current density, Short circuit
Abstract

An Al0.13GaInP sub-cell used as the top cell in the next generation of high efficiency multi-junction solar cells is fabricated. An efficiency of 10.04% with 1457.3 mV in Voc and 11.9 mA/cm2 in Isc was obtained. QE comparison was carried out to verify the influence of an O-related defect introduced by the high Al-content materials on the cell performance during MOCVD growth. Hetero-structures are employed to confirm the origin of the decreasing short circuit current density compared to a GaInP single junction solar cell. An effective method to improve the performance of broadband solar cells by increasing Isc with a cost of Voc was proposed.

Published
2014

230. Modification of the structure and function of myofibrillar protein by structurally relevant natural phenolic compounds

Author

Li, Na, Zhang, Kexin, Dong, Xinghua, Xu, Yunpeng, Tan, Zhifeng, Cao, Geng, Liu, Xiaoyang, Zhou, Dayong, and Li, Deyang

Abstract

Protein gelation is an important functional characteristic of shrimp surimi products. The effects of structurally relevant natural phenolic compounds on the structure and functional properties of myofibrillar protein (MP) of the Penaeus vannameiwere investigated. In the present study, phenolics improved the oxidative stability of MP, while leading to a decrease in the emulsification properties of MP. The carbonyl and free radical contents and fluorescence quantification of protein oxidation products showed that the addition of phenolic compounds could effectively prevent MP oxidation due to their antioxidant capacity derived from hydroxyl groups. In addition, phenolics could improve the rheological properties and gelling behavior of MP. Finally, the interactions between the substituents of MP and phenolic compounds were explored by molecular docking to elucidate the modification mechanism. Gallic acid (GA), quercetin (QT), and (−)-epigallocatechin-3-gallate (EGCG) interacted with MP mainly through hydrogen bonding to unfold the secondary structure of MP and reduce the surface hydrophobicity. Unlike GA and EGCG, QT interacted electrostatically with MP, maintaining the α-helical structure and leading to a slight increase in surface hydrophobicity. This study demonstrated the great potential of phenolic compounds as natural additives for the functional modification of shrimp surimi products.

Published
2023
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231. Epigallocatechin-3-gallate alleviates trans, trans-2,4-decadienal-induced endothelial pyroptosis and dysfunction by inhibiting NLRP3 inflammasome activation.

Author

Hu, Yuanyuan, Liu, Zhengqi, Tao, Xiaoya, Li, Jinjin, Hou, Zuoxu, Guo, Xiaoming, Zhou, Dayong, Wang, Mingfu, and Zhu, Beiwei

Abstract

[Display omitted] • tt-DDE, a lipid peroxidation product, induced pyroptotic cell death in HUVECs. • tt-DDE induced pyroptosis by activating NLRP3 inflammasome. • EGCG had protective effect on tt-DDE-induced cytotoxicity among the four catechins. • EGCG abated tt-DDE-caused endothelial pyroptosis and dysfunction in vitro and ex vivo. Trans, trans -2,4-decadienal (tt-DDE) is a highly reactive unsaturated aldehyde that widely present in foods. This study aimed to investigate the toxic effects of tt-DDE exposure on human umbilical vein endothelial cells (HUVECs) and the possible protective effects of green tea catechins. tt-DDE exposure induced pyroptosis and NLRP3 inflammasome activation in endothelial cells, as evidenced by increased LDH release and PI-positive cells, and elevated protein expressions of NLRP3, cleaved caspase-1, and GSDMD-N. NLRP3 inhibitor (MCC950) efficiently suppressed the tt-DDE-induced NLRP3 inflammasome activation and pyroptosis. Additionally, epigallocatechin-3-gallate (EGCG) showed the strongest activity among the four green tea catechins, which significantly alleviated tt-DDE-induced cytotoxicity. Moreover, EGCG effectively attenuated tt-DDE-induced endothelial cell pyroptosis and dysfunction by inhibiting NLRP3 inflammasome. Results of cultured mesenteric arteries further confirmed that EGCG prevented tt-DDE-induced endothelial dysfunction and pyroptosis. These results provide novel insights into tt-DDE-induced endothelial injury, and demonstrate the protective role of EGCG against tt-DDE-associated endothelial toxicity. [ABSTRACT FROM AUTHOR]

Published
2023
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232. Characterization of oyster water-soluble protein-EGCG conjugate and its antioxidant effects on linolic acid in emulsion system.

Author

Li, Yue, Liu, Xiaoyang, Yin, Fawen, Li, Deyang, Jiang, Pengfei, Song, Liang, Nakamura, Yoshimasa, and Zhou, Dayong

Subjects
LINOLENIC acids, EMULSIONS, EPIGALLOCATECHIN gallate, OIL-water interfaces, OYSTERS, FLUORESCENCE quenching
Abstract

(−)-Epigallocatechin-3-gallate (EGCG) is frequently used as a good antioxidant in food systems. In contrast, its antioxidant capacity was limited in the oil-in-water emulsion system due to its high hydrophilicity. Therefore, food-derived proteins with higher hydrophobicity were utilized to bind with EGCG and form new molecules that could stay in the oil-water interface to improve the stability of such emulsions. This study combined water-soluble protein (OWPs) extracted from oysters with EGCG to form the OWPs-EGCG complex. When combined with EGCG, the molecular weight and particle diameter (nearly 180–240 nm) of OWPs slightly increased in a dose-dependent manner by increasing the proportion of EGCG. Moreover, several conformational changes to OWPs by EGCG addition were found, such as the alteration of secondary structures, the fluorescence quenching, and the involvement of binding groups. The OWPs-EGCG complex (1:0.025) exhibited the highest emulsifying activities, while the ratio of 1:0.2 had the highest foaming stability. Furthermore, the OWPs-EGCG complex showed nearly 90% free radical scavenging activities with an increasing ratio of EGCG. In the established temporary storage model of OWPs-EGCG conjugate/linolic acid emulsion system, the OWPs-EGCG complex exhibited enhanced antioxidant effects against the oxidation of OWPs and linolic acid. This study provided a theoretical basis for the potential applications of food-derived proteins/EGCG conjugates on antioxidant effects against lipid oxidation in the emulsifying system. [ABSTRACT FROM AUTHOR]

Published
2023
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242. Changes in Body Wall of Sea Cucumber ( Stichopus japonicus) during a two-Step Heating Process Assessed by Rheology, LF-NMR, and Texture Profile Analysis.

Author

Bi, Jingran, Li, Yong, Cheng, Shasha, Dong, Xiuping, Kamal, Tariq, Zhou, Dayong, Li, Dongmei, Jiang, Pengfei, Zhu, Bei-Wei, and Tan, Mingqian

Abstract

Sea cucumber ( Stichopus japonicus) is regarded as a highly priced delicacy in Japan and China owing to its unique elasticity and palatability. Heating is an essential step to process sea cucumber with desired texture. In the present study, sea cucumber body wall was pre-heated at 40 °C, followed by post-heating at 80 °C. Changes in body wall were assessed by rheology, LF-NMR, and texture profile analysis. The small strain rheological analysis indicated that there were significant structural changes of body wall at about 40 °C during pre-heating. Large strain texture profile analysis and the storage modulus showed a good correlation. LF-NMR analysis displayed only one water population in samples pre-heated at 40 °C for up to 120 min, and the population did not change significantly with the heating duration. This demonstrated that structural changes and moisture loss from the inter collagen fibrils were not significant. As for samples post-heated at 80 °C, three distinct peaks were found and the T relaxation time and area of the bulk water decreased significantly, revealing significant changes of internal structures and loss of water-holding capacity. T parameters had a good correlation to texture profile analysis parameters for samples after both pre-heating and post-heating. [ABSTRACT FROM AUTHOR]

Published
2016
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