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Postharvest Variations of Rice Physicochemical Traits and Volatile Compounds under Granary Conditions During Long-Time Storage

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Rice science 2023年第2期30卷 92-95,I0007-I0009页

作者： HU Hao liu xingquan HE Yukai JIN Jiande WU Fenghua HUANG Shiwen ZHANG Jiaojiao College of Food and Health Zhejiang Agriculture and Forest UniversityHangzhou 311300China China National Rice Research Institute Hangzhou 310006China Zhejiang Province Grain Reserve Management Co.LTD Hangzhou 310006China

Rice quality is influenced by many factors,viz.,temperature,humidity,atmosphere and storage time.To uncover quality variations of rice after postharvest,we estimated the physicochemical properties and volatile compounds of an indica rice Zhongzheyou 8 under granary conditions(20ºC-25ºC in summer and 10ºC-15ºC in other seasons)for three years.

关键词： Traits humidity harvest

IMF production and symmetry energy in heavy ion collisions near Fermi energy

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Nuclear Science and Techniques 2013年第5期24卷 1-6页

作者： WADA Roy HUANG Meirong LIN Weiping liu xingquan ZHAO Minghui CHEN Zhiqiang Institute of Modern Physics Chinese Academy of Science University of Chinese Academy of Sciences

The symmetry energy at the time of the production of intermediate mass fragments(IMFs) is studied using experimentally observed IMF multiplicities combined with quantum statistical model calculations(QSM of Hahn and St cker).The ratios of difference in chemical potentials between neutrons and protons relative to the temperature,(μn-μp)/T,and the double ratio temperature,T,were extracted experimentally in the reactions of64,70Zn,64Ni+58,64Ni,112,124Sn,197Au,232Th at 40A MeV.The extracted(μn-μp)/TTscales linearly with δNN,where δNN is the asymmetry parameter,(N-Z)/A,of the emitting source and(μn-μp)/T=(11.1 1.4)δNN0.21 was derived.The experimentally extracted(μn-μp)/T and the double ratio temperatures are compared with those from the QSM calculations.The temperatures-,T,and densities,ρ,extracted from the(μn-μp)/T values agreed with those from the double ratio thermometer which used the yield ratios of d,t,h and α particles.However the two analyses of the differential chemical potential analysis and the initial temperature analysis end up almost identical relation between T and ρ.T=5.25±0.75 MeV is evaluated from the(μn-μp)/Tanalysis,but no density determination was possible.From the extracted T value,the symmetry energy coefficient Esym =14.6±3.5 MeV is determined for the emitting source of T=5.25±0.75 MeV.

关键词：国际货币基金组织对称能重离子碰撞生产费米能量子统计模型实验观察中等质量碎片

蒸制对甘薯可溶性膳食纤维提取、理化性质及消化特性的影响

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中国食品学报 2024年第2期24卷 140-150页

作者：刘步瑜刘兴泉张治国吴列洪蔡静杨开吴卫成浙江农林大学食品与健康学院杭州311300 浙江省农业科学院、食品科学研究所杭州310021 浙江省农业科学院、作物与核技术利用研究所杭州310021 浙江工业大学食品科学与工程学院浙江德清313299

目的:考察蒸制前、后甘薯中可溶性膳食纤维(SDF)提取、组成及性质的差异。方法:为获得高品质甘薯SDF,以提高提取得率和SDF总多糖含量为目标,采用响应面分析和满意度函数方法优化料液比、提取温度、提取时间3个参数,建立甘薯SDF提取工艺... 详细信息

目的:考察蒸制前、后甘薯中可溶性膳食纤维(SDF)提取、组成及性质的差异。方法:为获得高品质甘薯SDF,以提高提取得率和SDF总多糖含量为目标,采用响应面分析和满意度函数方法优化料液比、提取温度、提取时间3个参数,建立甘薯SDF提取工艺。从蒸制前、后的甘薯中提取得到生鲜甘薯膳食纤维(SDF-F)和蒸制甘薯膳食纤维(SDF-S),对比两者提取得率、多糖组成、膳食纤维含量以及持水力和持油力等理化性质差异,并做体外模拟消化试验。结果:优化的提取工艺参数为:料液比1∶16、提取温度40℃、提取时间40 min。在此工艺条件下,SDF-S的提取得率【(6.13±0.25)%vs(2.89±0.18)%】、中性多糖含量【(59.31±0.73)%vs(46.83±0.63)%】、酸性多糖含量【(25.36±0.48)%vs(9.60±0.14)%】、膳食纤维含量【(54.71±6.70)%vs(35.69±3.25)%】、持水力【(4.60±0.31)g/g vs(3.27±0.21)g/g)】和持油力【(3.30±0.40)g/g vs(1.82±0.28)g/g)】显著高于SDF-F(P<0.05),而SDF-F的抗消化性优于SDF-S。结论:蒸制处理虽提高了甘薯SDF的可及性,但导致SDF的抗消化性减弱。

关键词：甘薯蒸制可溶性膳食纤维中性多糖酸性多糖模拟消化

Experimental reconstruction of primary fragments with kinematical focusing method

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Nuclear Science and Techniques 2013年第5期24卷 54-58页

作者： LIN Weiping WADA Roy HUANG Meirong liu xingquan ZHAO Minghui CHEN Zhiqiang Institute of Modern Physics Chinese Academy of Science University of Chinese Academy of Sciences

An experimental method was used to evaluate the primary isotope yields of semi-central collisions in the reaction system64Zn+112Sn at 40A MeV.The characteristic nature of the hot nuclear matter at the time of the isotope formation was studied.The multiplicities of light particles(LPs) associated with intermediate mass fragments(IMFs) were determined experimentally by using a kinematical focusing technique.The primary isotope distributions,reconstructed by a Monte Carlo method,were compared with those of the AMD-Gemini simulations.ac/T=0.11 and asym/T=3.34 were extracted from the reconstructed primary fragments yield.These are consistent with those of the primary fragments of the AMD simulation.

关键词：运动学主段实验聚焦法同位素分布中等质量碎片蒙特卡罗方法反应体系

Raman spectroscopy of single quantum well wires

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Chinese Science Bulletin 2000年第23期45卷 2138-2141页

作者： LI Leyu ZHANG Shulin LI Zhifeng liu xingquan LU Wei SHEN Xuechu Department of Physics Peking UniversityBeijing 100871China National Laboratory of Infrared Physics Chinese Academy of SciencesShanghai 200083China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China

We used the micro-Raman spectroscopy to investigate the V-grooved quantum well wires (QWWs), and first observed and assigned the Raman spectra of single QWW. They were the disorder induced modes at 223 and 243 cm-1, c... 详细信息

关键词： quantum well wires GaAs Raman spectroscopy.

基于GC-IMS技术分析天敌马六甲肉食螨挥发性物质对粮食的影响

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中国粮油学报 2024年第6期39卷 20-28页

作者：贡晨光薛丁榕刘兴泉伍祎浙江农林大学食品与健康学院临安 311300 国家粮食和物资储备局科学研究院粮食储运国家工程研究中心北京 100037 国家粮食和物资储备局科学研究院粮食储运国家工程研究中心北京 100037 浙江农林大学食品与健康学院临安 311300

储粮害虫天敌应用对粮食气味物质的影响是评价天敌防控安全性的重要内容,马六甲肉食螨(Cheyletus malaccensis Oudemans)是我国粮仓中的重要天敌,本研究针对马六甲肉食螨在粮仓应用后对粮食挥发性物质的影响,采集天敌马六甲肉食螨、粮... 详细信息

储粮害虫天敌应用对粮食气味物质的影响是评价天敌防控安全性的重要内容,马六甲肉食螨(Cheyletus malaccensis Oudemans)是我国粮仓中的重要天敌,本研究针对马六甲肉食螨在粮仓应用后对粮食挥发性物质的影响,采集天敌马六甲肉食螨、粮食和投放天敌的粮食,通过气相色谱-离子迁移谱(GC-IMS)提取样品的气味物质并形成指纹图谱,分析投放天敌的小麦和稻谷在不同储藏时期的挥发性化合物,以评价粮仓中投放天敌的安全性.研究结果表明,纯马六甲肉食螨挥发性化合物随着数量的增加而增加,500头时检测出23种,纯小麦中检测出62种,纯稻谷中检测出89种.小麦中投放天敌未发现特异性物质,但发现26种物质的含量存在差异.此外,随着储藏时间的延长,纯小麦中6种物质的含量存在极显著差异(P＜0.01),而投放天敌的小麦也有3种物质含量产生变化.同样,稻谷中投放天敌未发现特异性物质,但发现38种物质的含量存在差异,纯稻谷随着储藏时间的延长,5种物质的含量存在极显著差异(P＜0.01),投放天敌的稻谷则随着储藏时间的延长,8种物质的含量产生变化.粮食中投放马六甲肉食螨后,气味物质种类没有改变,仅气味物质浓度有所改变.

关键词：小麦稻谷马六甲肉食螨挥发性有机物气相色谱-离子迁移谱

基于GC-MS和快速气相电子鼻对我国东北地区代表性粳米香气组分分析

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中国粮油学报 2024年第4期39卷 171-179页

作者：蒋森涛段晓亮张东商博刘辉马航杨潮锋刘兴泉浙江农林大学食品与健康学院临安311300 国家粮食和物资储备局科学研究院北京100000

为探究我国东北地区4种代表性粳米(香米五优稻4号、绥粳18和非香米龙粳31、盐丰47)香气组分差异,通过顶空-固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS)和快速气相电子鼻(Flash GC e-nose)技术对粳米香气组分进行鉴定。研究采用正交偏... 详细信息

为探究我国东北地区4种代表性粳米(香米五优稻4号、绥粳18和非香米龙粳31、盐丰47)香气组分差异,通过顶空-固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS)和快速气相电子鼻(Flash GC e-nose)技术对粳米香气组分进行鉴定。研究采用正交偏最小二乘法-判别分析(OPLS-DA)和层次聚类分析(HCA)等方法对4种粳米香气组分进行分析,结果表明,4种粳米的主要香气组分构成类似,以己醛、壬醛等醛类为主;五优稻4号主要香气成分含量显著(P≤0.05)高于其他3个品种粳米,使得其香气更加浓郁;关于粳米香气组分鉴定技术,GC-MS技术的准确度和检测范围优于电子鼻技术,而检测效率低于电子鼻技术。

关键词：东北粳米香气组分顶空-固相微萃取-气相色谱-质谱联用(HS-SPME-GC-MS) 快速气相电子鼻(Flash GC e-nose) 正交偏最小二乘法-判别分析(OPLS-DA) 层次聚类分析(HCA)

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玉米氮气气调启封后品质变化规律研究

中国粮油学报 2024年第5期39卷 22-28页

作者：蔡婷刘兴泉李倩倩颉宇石天玉杨东浙江农林大学食品与健康学院临安311300 国家粮食和物资储备局科学研究院北京100037

本研究以初始水质量分数13.7%和14.5%的玉米为实验对象,采用99%体积分数的氮气进行气调处理,对启封后的玉米分别在20、25、30℃条件下储藏过程中的抗氧化酶活性等品质进行检测和对比分析。结果表明:气调启封后气调组和对照组玉米游离脂... 详细信息

本研究以初始水质量分数13.7%和14.5%的玉米为实验对象,采用99%体积分数的氮气进行气调处理,对启封后的玉米分别在20、25、30℃条件下储藏过程中的抗氧化酶活性等品质进行检测和对比分析。结果表明:气调启封后气调组和对照组玉米游离脂肪酸(FFA)含量、过氧化物酶(POD)均有所下降,FFA含量降幅较明显,启封后储藏180 d气调组和对照组分别降低了2.67~5.34μmol/L和2.09~3.39μmol/L;脂肪酸值、丙二醛含量(MDA)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、脱氢抗坏血酸含量(DHA)等指标呈上升趋势。其中,12组抗氧化酶活性的综合评价得分均大于0.63,表明启封后在20℃条件下储藏6个月的抗氧化酶活性保持效果较好。

关键词：氮气气调启封玉米

The research progress of an E//B neutral particle analyzer

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Plasma Science and Technology 2024年第3期26卷 10-16页

作者：马龙屈玉凡罗圆谢德豪汪彦熹王硕曲国峰任培培罗小兵刘星泉韩纪锋 Roy WADA 林炜平臧临阁朱敬军 Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064People's Republic of China Southwestern Institute of Physics Chengdu 610064People's Republic of China Cyclotron Institute Texas A&M UniversityCollege StationTexas 77843United States of America

An E//B neutral particle analyzer(NPA)has been designed and is under development at Sichuan University and Southwestern Institute of Physics.The main purpose of the E//B NPA is to measure the distribution function of fast ions in the HL-2A/3 tokamak.The E//B NPA contains three main units,i.***.the stripping unit,the analyzing unit and the detection unit.A gas stripping chamber was adopted as the stripping unit.The results of the simulations and beam tests for the stripping chamber are presented.Parallel electric and magnetic fields provided by a NdFeB permanent magnet and two parallel electric plates were designed and constructed for the analyzing unit.The calibration of the magnetic and electric fields was performed using a 50 kV electron cyclotron resonance ion source(ECRIS)platform.The detection unit consists of 32lutetium-yttrium oxyorthosilicate(LYSO)detector modules arranged in two rows.The response functions ofα,hydrogen ions(H^(+),H_(2)^(+)and H_(3)^(+))andγfor a detector module were measured with^(241)Am,^(137)Cs and^(152)Eu sources together with the 50 kV ECRIS platform.The overall results indicate that the designed E//B NPA device is capable of measuring the intensity of neutral hydrogen and deuteron atoms with energy higher than 20 keV.

关键词： E//B neutral particle analyzer gas stripping lutetium-yttrium oxyorthosilicate electron cyclotron resonance ion source platform