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Identification of Odor Volatile Compounds and Deodorization ofPaphia undulata Enzymatic Hydrolysate

Journal of Ocean University of China 2016年第6期15卷 1101-1110页

作者： CHEN Deke CHEN Xin CHEN Hua CAI Bingna wan peng ZHU Xiaolian SUN Han SUN Huili PAN Jianyu Key Laboratory of Tropical Marine Bio-resource and Ecology/Guangdong Key Laboratory of Marine Meteria Medica South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China Department of Chemistry and Chemical Engineering Foshan University Foshan 528000 P. R. China Ru-tgers University 98 Brett Road Piscataway New Jersey 08854 USA

Unfavorable fishy odour is an inevitable problem in aquatic products. In the present study, headspace solid-phase mi- croextraction gas chromatography mass spectrometry （HS-SPME-GC-MS） analysis of volatiles from untreated samples and three deodorized samples （under the optimal conditions） ofPaphia undulata enzymatic hydrolysate revealed that the compounds contrib- uting to the distinctive odor were 1-octen-3-ol, n-hexanal, n-heptanal, 2,4-heptadienal, and 2,4-decadienal, whereas n-pentanal, n-octanal, n-octanol, benzaldehyde, 2-ethylfuran and 2-pentylfuran were the main contributors to the aromatic flavor. The deodoriz- ing effects of activated carbon （AC） adsorption, yeast extract （YE） masking and tea polyphenol （TP） treatment on a P. undulata en- zymatic hydrolysate were investigated using orthogonal experiments with sensory evaluation as the index. The following optimized deodorization conditions were obtained： AC adsorption （35 mg mL-1, 80℃, 40 rain）, YE masking （7 mgmL l, 45 ℃, 30 min） and TP treatment （0.4mgmL-l, 40℃, 50min）. AC adsorption effectively removed off-flavor volatile aldehydes and ketones. YE masking modified the odor profile by increasing the relative contents of aromatic compounds and decreasing the relative contents of aldehydes and ketones. The TP treatment was not effective in reducing the odor score, but it significantly reduced the relative content of alde- hydes while increasing that of alkanes. It is also notable that TP effectively suppressed trimethylamine （TMA） formation in a P. un- dulate hydrolysate solution for a period of 72 h.

关键词： deodorization off-flavor trimethylamine enzymatic hydrolysate Paphia undulate

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Response of Ecosystem Respiration to Experimental Warming and Clipping at Daily Time Scale in an Alpine Meadow of Tibet

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Journal of Mountain Science 2013年第3期10卷 455-463页

作者： FU Gang SHEN Zhen-xi ZHANG Xian-zhou YU Cheng-qun ZHOU Yu-ting LI Yun-long YANG peng-wan Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

The alpine meadow, as one of the typical vegetation types on the Tibetan Plateau, is one of the most sensitive terrestrial ecosystems to climate warming. However, how climate warming affects the carbon cycling of the alpine meadow on the Tibetan Plateau is not very dear. A field experiment under controlled experimental warming and clipping conditions was conducted in an alpine meadow on the Northern Tibetan Plateau since July 2008. Open top chambers （0TCs） were used to simulate climate warming. The main objective of this study was to examine the responses of ecosystem respiration （Reco） and its temperature sensitivity to experimental warming and clipping at daily time scale. Therefore, we measured Reco once or twice a month from July to September in 2010, from June to September in 2011 and from August to September in 2012. Air temperature dominated daily variation of Reco whether or not experimental warming and clipping were present. Air temperature was exponentially correlated with Reco and it could significantly explain 58-96% variation of Redo at daily time scale. Experimental warming and clipping decreased daily mean Reco by 5.8-37.7% and -11.9-23.0%, respectively, although not all these changes were significant. Experimental warming tended to decrease the temperature sensitivity of Reco, whereas clipping tended to increase the temperature sensitivity of Reco at daily time scale. Our findings suggest that Reco wasmainly controlled by air temperature and may acclimate to climate warming due to its lower temperature sensitivity under experimental warming at daily time scale.

关键词： Acclimation Air temperature Open topchamber Temperature sensitivity Respirationquotient ( Q10)

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α-Glucosidase inhibitory phenylpropanoid constituents isolated from blueberry flowers

α-Glucosidase inhibitory phenylpropanoid constituents isola...

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中国化学会第十届全国天然有机化学学术会议

作者： Chun-peng wan Jiangxi Key Laboratory for Fresh Fruits ＆ Vegetables and Nondestructive Tests College of Agronomy Jiangxi Agricultural University

＜正＞Blueberries are the fruits obtained from two main North American plants,the highbush（Vaccinium corymbosum L.）and lowbush（*** L.）blueberry *** have received extensive research and public attention largely due to a multitude of health benefits including antioxidant,anti-inflammatory,anticancer,anti-neurodegenerative,and cardioprotective

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Perturbation effect of rock rheology under uniaxial compression

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Journal of Central South University 2017年第7期24卷 1684-1695页

作者： GAO Yan-fa HUANG wan-peng QU Guang-long wanG Bo CUI Xi-hai FAN Qing-zhong School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China College of Mining and Safety Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control(Shandong University of Science and Technology) Qingdao 266590China North China Institute of Science and Technology Langfang 065201China College of Water Conservancy and Civil Engineering Shandong Agricultural UniversityTaian 261000China

Soft and medium-hard rocks are subjected to high rheology under high stress,and they are prone to a relatively large-degree of deformation when perturbed by external impacting *** phenomenon where rock deformation is developed due to external impacting perturbation in the rheological state is defined as the rock rheological perturbation *** work presents a new experimental system for investigating the rock rheological perturbation effect with experiments on medium-hard red *** from our analysis show that red sandstone changes under two mechanical mechanisms:deformation-hardening effects at low stress states,and damage-fracture effects at high stress states when impacted by certain external impacting *** sandstone tested in our experiments has a strain threshold of about 90% of the ultimate strain under the perturbation effect;the red sandstone is sensitive to a perturbed load when its actual strain exceeds the *** perturbed deformation process of the rock can be divided into three phases:decline,approximately constant speed and *** rock will be rapidly destroyed when the perturbed deformation accumulates to a certain *** perturbation effect of rock deformation under uniaxial compression is more obvious than that under axial *** on our experiment,a constitutive relation of the rock rheological perturbation effect is developed.

关键词： rock rheology perturbation effect experimental system strain threshold

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Gas evolution characteristics of three kinds of no-bake resin-bonded sands for foundry in production

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China Foundry 2022年第2期19卷 140-148页

作者： Xue-wen Qian peng wan Ya-jun Yin Yu-yang Qi Xiao-yuan Ji Xu Shen Yuan-cai Li Jian-xin Zhou State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

No-bake resin-bonded sand is commonly used in casting ***,its air pollution is relatively serious,especially in the molding and pouring *** this reason,it is necessary to study the gas evolution characteristics of no-bake resin-bonded sand from room temperature to high temperatures,and not only the amount of gaseous products,but also the composition of the gaseous ***-bake furan resin-bonded sand(#1),phenolic urethane no-bake resin-bonded sand(#2),and alkaline phenolic no-bake resin-bonded sand(#3)are the three most common no-bake resin-bonded sands in *** gas evolution volume and rate of these three no-bake resin-bonded sands were ***-mass spectrometer(TG-MS),headspace-gas chromatography/mass spectrometer(HS-GC/MS),and pyrolysis-gas chromatography/mass spectrometer(PY-GC/MS)were used to measure the composition of the gaseous products emitted from binders at room temperature and high *** differences between formaldehyde,heterocyclic aromatic compounds(HAC),monocyclic aromatic hydrocarbons(MAH),and polycyclic aromatic hydrocarbons(PAHs)gaseous products from the three types of no-bake resin-bonded sands during the molding and casting process were *** the perspective of environmental protection,alkaline phenolic no-bake resin-bonded sand and no-bake furan resin-bonded sand are better than phenolic urethane no-bake resin-bonded sand.

关键词： no-bake resin-bonded sand gas evolution volume gas evolution rate composition of gaseous products

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Clipping Alters the Response of Biomass Production to Experimental Warming: A Case Study in an Alpine Meadow on the Tibetan Plateau, China

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Journal of Mountain Science 2015年第4期12卷 935-942页

作者： FU Gang SUN Wei YU Cheng-Qun ZHANG Xian-Zhou SHEN Zhen-Xi LI Yun-Long YANG peng-wan ZHOU Nan Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences

Predicting how human activity will influence the response of alpine grasslands to future warming has many *** this study, a field experiment with controlled warming and clipping was conducted in an alpine meadow at three elevations（4313 m, 4513 m and 4693 m） in Northern Tibet to test the hypothesis that clipping would alter warming effect on biomass *** top chambers（OTCs） were used to increase temperature since July,2008 and the OTCs increased air temperature by approximately 0.9o C ~ 1.8o C during the growing *** was conducted three times one year during growing season and the aboveground parts of all live plants were clipped to approximately 0.01 m in height using scissors since *** primary production（GPP） was calculated from the Moderate-Resolution Imaging Spectroradiometer GPP algorithm and aboveground plant production was estimated using the surface-measured normalized difference vegetation index in *** decreased the GPP, aboveground biomass（AGB） and aboveground net primary production（ANPP） at all three elevations when clipping was not *** contrast, warming increased AGB at all three elevations, GPP at the two lower elevations and ANPP at the two higher elevations when clipping was *** findings show that clipping reduced the negative effect of warming on GPP, AGB and ANPP, suggesting that clipping may reduce the effect of climate warming on GPP, AGB and ANPP in alpine meadows on the Tibetan Plateau, and therefore, may be a viable strategy for mitigating the effects of climate change on grazing and animal husbandry on the Tibetan Plateau.

关键词： Clipping Gross primary production Open top chamber Warming Alpine Meadow Tibetan Plateau

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Exploration of porous SiC nanostructures as thermal insulator with high thermal stability and low thermal conductivity

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功能材料信息 2016年第1期13卷 50-51页

作者： peng wan Jingyang wanG High-performance Ceramic Division Institute of Metal ResearchChinese Academy of Sciences

The crucial challenge for current nanoscale thermal insulation materials,such as Al_2O_3 and SiO_2 aerogel composites,is to solve the trade-off between extremely low thermal conductivity and unsatisfied thermal *** hi... 详细信息

关键词：英语阅读理解陶瓷材料

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基于偏振依赖多模-单模-多模光纤滤波器的波长间隔可调谐双波长掺铒光纤激光器

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物理学报 2019年第15期68卷 240-247页

作者：彭万敬刘鹏中国工程物理研究院应用电子学研究所高能激光科学与技术重点实验室绵阳621900 邢台学院物理与电子工程学院邢台054001

报道了一种具有全光纤结构的双波长掺铒光纤激光器,该激光器的核心器件为一款新型的多模-单模-多模光纤干涉滤波器.该滤波器通过一段偏振保持光纤引入偏振依赖相位差,因而其干涉滤波效果具有良好的偏振依赖特性.入射抽运功率为50mW时,... 详细信息

报道了一种具有全光纤结构的双波长掺铒光纤激光器,该激光器的核心器件为一款新型的多模-单模-多模光纤干涉滤波器.该滤波器通过一段偏振保持光纤引入偏振依赖相位差,因而其干涉滤波效果具有良好的偏振依赖特性.入射抽运功率为50mW时,系统输出激光波长为1544.82与1545.61nm,波长间隔0.8nm,双波长激光边模抑制比均大于45dB,输出峰值功率差小于1dB,功率波动在0.7dB以内.通过调整腔内的偏振控制器,可实现双波长间隔的连续可调谐输出,波长间隔的调谐范围为0—3nm.输出信号的偏振态测试结果显示,系统保持精准的单偏振输出,并且在不同的调谐条件下,双波长激光表现出不同的偏振特性,当双波长激光的偏振状态相互正交时,系统的偏振消光比达到35dB,整体调谐过程表现出良好的偏振稳定度.

关键词：光纤激光器光纤干涉滤波器双波长连续可调谐

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Microcrystal modulated exciton-polariton emissions from single ZnO@ZnO:Ga microwire

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Photonics Research 2020年第2期8卷 175-185页

作者： wanGQI MAO MINGMING JIANG JIAOLONG JI peng wan XIANGBO ZHOU CAIXIA KAN College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory for Intelligent Nano Materials and Devices(MOE) Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Due to their outstanding surface-to-volume ratio,highly smooth surface,and well-defined crystal boundary,semiconducting micro-/nanocrystals have been used as a pivotal platform to fabricate multifunctional optoelectronic devices,such as superresolution imaging devices,solar concentrators,photodetectors,light-emitting diodes(LEDs),and *** particular,micro-/nanocrystals as key elements can be employed to tailor the fundamental optical and electronic transport properties of integrated hetero-/***,ZnO micro crystal-decorated pre-synthesized Ga-doped ZnO microwire(ZnO@ZnO:Ga MW)was *** single ZnO@ZnO:Ga MW can be used to construct optically pumped Fabry-Perot(F-P)mode microlasers,with the dominating lasing peaks centered in the violet spectral *** exciton-po lari ton emissions from single ZnO@ZnO:Ga MW-based heterojunction diode can also be *** deposited ZnO microcrystals can facilitate the strong coupling of F-P optical modes with excitons,leading to the formation of exciton-polariton features in the ZnO@ZnO:Ga ***,the waveguiding lighting behavior and energy-band alignment of ZnO microcrystal-sheathed ZnO:Ga MW radial structures should be extremely attractive for potential applications in semiconducting microstructure-based optoelectronic devices,such as micro-LEDs,laser microcavities,waveguides,and photodetectors.

关键词： optoelectronic pumped heterojunction

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Bifunctional ultraviolet light-emitting/detecting device based on a SnO_(2) microwire/p-GaN heterojunction

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Photonics Research 2021年第12期9卷 2475-2485页

作者： TONG XU MINGMING JIANG peng wan KAI TANG DANING SHI CAIXIA KAN College of Science MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNanjing 211106China

SnO_(2)has attracted considerable attention due to its wide bandgap,large exciton binding energy,and outstanding electrical and optoelectronic *** to the lack of reliable and reproducible p-type SnO_(2),many challenges on developing SnO_(2)-based optoelectronic devices and their practical applications still ***,single-crystal SnO_(2)microwires(MWs)are acquired via the self-catalyzed *** a strategic alternative,n-SnO_(2)MW/p-GaN heterojunction was constructed,which exhibited selectable dual-functionalities of light-emitting and photodetection when operated by applying an appropriate *** device illustrated a distinct near-ultraviolet light-emission peaking at∼395.0 nm and a linewidth∼50 ***,the device characteristics,in terms of the main peak positions and linewidth,are nearly invariant as functions of various injection current,suggesting that quantum-confined Stark effect is essentially ***,the identical n-SnO_(2)MW/p-GaN heterojunction can also achieve photovoltaic-type light *** device can steadily feature ultraviolet photodetecting ability,including the ultraviolet/visible rejection ratio(R_(360 nm)/R_(400 nm))∼1.5×10^(3),high photodark current ratio of 105,fast response speed of 9.2/51 ms,maximum responsivity of 1.5 A/W,and detectivity of 1.3×10^(13)Jones under 360 nm light at−3 V ***,the bifunctional device not only displays distinct near-ultraviolet light emission,but also has the ability of high-sensitive ultraviolet *** novel design of n-SnO_(2)MW/p-GaN heterojunction bifunctional systems is expected to open doors to practical application of SnO_(2)microstructures/nanostructures for large-scale device miniaturization,integration and multifunction in next-generation high-performance photoelectronic devices.

关键词： heterojunction optoelectronic ultraviolet

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