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干燥方式对毛竹笋全粉理化特性及结构的影响

食品工业科技 2024年第14期45卷 89-96页

作者：李艳艳史早冉莎杨金来李彬吴良如郑炯西南大学食品科学学院重庆400715 食品科学与工程国家级实验教学示范中心(西南大学) 重庆400715 国家林业和草原局竹子研究开发中心浙江省竹子高效加工重点实验室浙江杭州310012 重庆市林业科学院重庆400036

为探究干燥方式对毛竹笋全粉(Phyllostachys pubescens shoot powder,PPSP)理化特性及结构的影响,该实验以毛竹笋为原料,采用喷雾干燥(Spray drying,SD)、热风干燥(Hot air drying,HAD)和低温真空干燥(Low-temperature vacuum drying,LVD)3种方式制备PPSP,比较3种PPSP的营养成分、持水力、持油力、膨胀力、色泽等理化特性,并通过红外光谱、X-射线衍射、扫描电镜分析其结构。结果表明,不同干燥方式制备的PPSP营养成分差异显著(PLVD>HAD;3组PPSP的L*值、a*值、b*值均有显著差异(P<0.05),LVD样品的L*值为77.32,显著高于SD和HAD样品(P<0.05),且其a*值和b*值最低,分别为3.74、14.50;SD和LVD显著降低了样品的热稳定性(P<0.05)。干燥方式未改变PPSP的基本结构和官能团以及晶体结构。扫描电镜观察到SD制备的PPSP颗粒尺寸明显减小,分布更为均匀。综上所述,LVD制备的毛竹笋干制品营养、理化特性及结构整体最佳,其次是SD。研究结果可为高品质PPSP的制备提供理论参考。

关键词：毛竹笋全粉喷雾干燥热风干燥低温真空干燥理化特性

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酸笋中微生物区系演替和风味物质形成机制的研究进展

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食品与发酵工业 2024年第4期50卷 315-321页

作者：薛冰洁胡荣吴良如杨金来李彬张甫生郑炯西南大学食品科学学院重庆400715 国家林业和草原局竹子研究开发中心浙江杭州310012 重庆市林业科学院重庆400036

酸笋是竹笋经微生物发酵作用而成的一种中国传统发酵蔬菜,目前常作为螺蛳粉、桂林米粉的配料,因其独特的风味深受广大消费者的喜爱。酸笋中微生物群落的构成及其代谢是酸笋生产的核心,酸笋中风味物质的含量和种类是决定酸笋品质的关键... 详细信息

酸笋是竹笋经微生物发酵作用而成的一种中国传统发酵蔬菜,目前常作为螺蛳粉、桂林米粉的配料,因其独特的风味深受广大消费者的喜爱。酸笋中微生物群落的构成及其代谢是酸笋生产的核心,酸笋中风味物质的含量和种类是决定酸笋品质的关键。而微生物是酸笋风味的主要来源,两者在发酵过程中密切相关。因此,该文总结了酸笋中微生物的构成及其演替规律,分析了影响酸笋微生物演替的因素,概述了酸笋中的风味物质,阐述了微生物诱导风味物质形成的机理,有助于进一步了解酸笋中复杂微生物群落和风味物质的互作效应,从而为酸笋的品质提升及质量控制提供理论依据。

关键词：酸笋微生物群落乳酸菌风味物质有机酸

不同干燥方式对毛竹笋全粉中氨基酸含量和蛋白质结构的影响

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食品与发酵工业 2024年第15期50卷 241-247页

作者：李艳艳杨金来吴琰李彬张甫生吴良如郑炯西南大学食品科学学院重庆400715 国家林业和草原局竹子研究开发中心浙江省竹子高效加工重点实验室浙江杭州310012 重庆市林业科学院重庆400036

为探究不同干燥方式对竹笋全粉氨基酸含量及蛋白质结构的影响,该实验采用喷雾干燥(spray drying,SD)、热风干燥(hot air drying,HAD)、微波干燥(microwave drying,MD)、低温真空干燥(low-temperature vacuum drying,LVD)4种方式制备毛... 详细信息

为探究不同干燥方式对竹笋全粉氨基酸含量及蛋白质结构的影响,该实验采用喷雾干燥(spray drying,SD)、热风干燥(hot air drying,HAD)、微波干燥(microwave drying,MD)、低温真空干燥(low-temperature vacuum drying,LVD)4种方式制备毛竹笋全粉(Phyllostachys pubescens shoot powder,PPSP),分析了4种干燥方式的PPSP氨基酸组成及含量,并基于拉曼光谱酰胺Ⅰ带比较了4组样品蛋白质二级结构变化。结果表明,LVD制备的PPSP总氨基酸含量最高,为29.19 g/100 g,其次为SD,HAD制备的PPSP总氨基酸含量最低。LVD组的PPSP中必需氨基酸含量最高,为10.43 g/100 g,占总氨基酸含量的35.73%。LVD和SD制备的PPSP中呈味氨基酸含量分别为17.58 g/100 g、15.81 g/100 g,显著高于HAD和MD组的呈味氨基酸含量。LVD样品中氨基酸组成最接近于标准模式谱。通过主成分分析提取出2个主成分,累计方差贡献率达89.45%,综合评分结果为:LVD>SD>MD>HAD,聚类热图将4种干燥方式分为3类。干燥后的PPSP蛋白质中β-折叠结构最高,占总二级结构的74.66%~83.35%,HAD样中β-折叠、α-螺旋结构含量明显高于其他样品。该研究可为毛竹笋干燥及竹笋全粉的开发利用提供理论参考。

关键词：毛竹笋全粉干燥方式低温真空干燥氨基酸含量蛋白质二级结构

Diffusion and reaction mechanism of limestone and quartz in fluxed iron ore pellet roasting process

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 485-497页

作者： Yufeng Guo jinlai Zhang Shuai Wang Jianjun Fan Haokun Li Feng Chen Kuo Liu Lingzhi yang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Technology Center Taiyuan Iron Steel(Group)Co.Ltd.(TISCO)Taiyuan 030003China

The increase to the proportion of fluxed pellets in the blast furnace burden is a useful way to reduce the carbon emissions in the ironmaking *** this study,the interaction between calcium carbonate and iron ore powder and the mineralization mechanism of fluxed iron ore pellet in the roasting process were investigated through diffusion couple *** electron microscopy with energy dispersive spectroscopy was used to study the elements’diffusion and phase transformation during the roasting *** results indicated that limestone decomposed into calcium oxide,and magnetite was oxidized to hematite at the early stage of *** the increase in roasting temperature,the diffusion rate of Fe and Ca was obviously accelerated,while the diffusion rate of Si was relatively *** order of magnitude of interdiffusion coefficient of Fe_(2)O_(3)-CaO diffusion couple was 10^(−10) m^(2)·s^(−1) at a roasting temperature of 1200℃for 9 ***_(2)Fe_(2)O_(5) was the initial product in the Fe_(2)O_(3)-CaO-SiO_(2) diffusion interface,and then Ca_(2)Fe_(2)O_(5) continued to react with Fe_(2)O_(3) to form CaFe_(2)O_(4).With the expansion of the diffusion region,the sillico-ferrite of calcium liquid phase was produced due to the melting of SiO_(2) into CaFe_(2)O_(4),which can strengthen the consolidation of fluxed ***,andradite would be formed around a small part of quartz particles,which is also conducive to the consolidation of fluxed *** addition,the principle diagram of limestone and quartz diffusion reaction in the process of fluxed pellet roasting was discussed.

关键词： fluxed iron ore pellet limestone hematite quartz diffusion reaction

Extraction,Optical Properties and Bio-Imaging of Fluorescent Composition From Moso Bamboo Shoots

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Journal of Renewable Materials 2019年第11期7卷 1209-1219页

作者： jinlai yang Liangru Wu Yanhong Pan Hao Zhong China National Bamboo Research Center Hangzhou310012China Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province Hangzhou310012China Key Laboratory of Resources and Utilization of Bamboo of State Forestry Administration Hangzhou310012China

A novel fluorescent composition was firstly isolated from natural winter fresh Moso bamboo shoots,and its optical properties were fully investigated by fluorescence *** could emit strong blue light both in solid and solution state,providing high fluorescence intensity in *** solution’s concentration and addition of water greatly affected the fluorescence intensity,high concentration and addition of much water could quench *** results showed that the fluorescent extract(0-25 mg/L)could not induce apoptosis of Hela *** fluorescent microscopic imaging in human hepatocellular carcinoma cells(HepG2)was realized using the fluorescent extract,it could dye the whole cell well which was different from 4',6-diamidino-2-phenylindole(DAPI)only dying cell *** fluorescent extract may be candidate for future natural fluorescent bio-imaging agent.

关键词： Bamboo shoots extraction fluorescent composition optical properties bio-imaging

High-speed GeSn resonance cavity enhanced photodetectors for a 50 Gbps Si-based 2 μm band communication system

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Photonics Research 2024年第4期12卷 767-773页

作者： jinlai CUI JUN ZHENG YUPENG ZHU XIANGQUAN LIU YIyang WU QINXING HUANG YAZHOU yang ZHIPENG LIU ZHI LIU YUHUA ZUO BUWEN CHENG Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Expanding the optical communication band is one of the most effective methods of overcoming the nonlinear Shannon capacity limit of single *** this study,GeSn resonance cavity enhanced(RCE)photodetectors(PDs)with an active layer Sn component of 9%–10.8%were designed and fabricated on an SOI *** GeSn RCE PDs present a responsivity of 0.49 A/W at 2μm and a 3-dB bandwidth of approximately 40 GHz at 2μ***,Si-based 2μm band optical communication with a transmission rate of 50 Gbps was demonstrated by using a GeSn RCE *** work demonstrates the considerable potential of the Si-based 2μm band photonics in future high-speed and high-capacity optical communication.

关键词： resonance system approximate

Measurements and analyses of infrasound noise field in the atmosphere

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Chinese Journal of Acoustics 1991年第4期10卷 311-316页

作者： XIE jinlai and yang Xunren(Institute of Acoustics,Academia Sinica)

Methods for measuring and analyzing the infrasound noise field in the atmosphere have been expounded. A set of space correlation radii of noise corresponding to wind speed 4 m/ s has been obtained, which can be taken as the tentative basis for an acoustical array design. At the same time, the wind speed-sound pressure relation curves have been measured and calculated, and the anti-jamming ability of the array receiving infrasonic signals is obtained.

关键词： Measurements and analyses of infrasound noise field in the atmosphere

ON THE ATMOSPHERIC GRAVITY WAVES DURING THE 23RD SEPTEMBER 1987 ANNULAR SOLAR ECLIPSE

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Chinese Journal of Acoustics 1989年第4期8卷 335-340页

作者： XIE jinlai, yang Xunren(Institute of Acoustics, Academia Sinica)LI Qitai(Institute of Environmental Protection of Guizhou Province) Acad Sinica

During solar eclipse, the lunar shadow moves through the earth's atmosphere with supersonic speed. Chimonas and Hines deemed that the shock waves produced by cooling of atmosphere would induce gravity waves, and both TIDs and atmospheric pressure changes can be detected in the ionosphere and on the ground respectively. Although the IGW signals from solar eclipse are usually quite weak, they can still be detected .The pressure changes on ground level occur near the region of eclipse, but can be detected even far beyond the path of eclipse. This article is the first one to report results of detecting pressure waves caused by solar eclipse in China.Druing the 23rd September 1987 annular solar eclipse, IGWs have been detected and recorded at infrasound observatories in Urumqi, Taiyuan, Xuzhou and Suzhou, which are situated within the path of annular eclipse, as well as in Beijing and Guiyang, which are situated on the opposite sides of this path. The signals are detected by microbarometers of condenser microphone type. After analysing the waveforms of the recorded signals numerically, the wave periods and wave amplitudes are determined to be within the ranges from 10 to 60 min and from 7 to 20 Pa (peak to peak ) respectively. The results from dynamical spectral analyses show that the spectral distribution of all the gravity wave periods from various observatories is continuous and possesses a common main period of 40 min. Moreover, there are waves with even longer periods in different observatories and their appearance times are quite different.

关键词： Nature ON THE ATMOSPHERIC GRAVITY WAVES DURING THE 23RD SEPTEMBER 1987 ANNULAR SOLAR ECLIPSE RD

出平面剪切波作用下弹性非均匀材料中圆孔受刚度影响的力学分析

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Acta Mechanica Sinica 2024年第4期40卷 226-237页

作者：卞金来杨在林 Erasmo Carrera College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin150001China Key Laboratory of Advanced Material of Ship and Mechanics Ministry of Industry and Information TechnologyHarbin Engineering UniversityHarbin150001China Department of Mechanical and Aerospace Engineering Politecnico di TorinoTurinItaly

基于复变函数理论,研究了出平面剪切波在非均匀直角域内的传播特性.介质的非均匀性体现在剪切模量是与空间坐标有关的函数.引入一个位移辅助函数和一对映射函数用以辅助推导控制方程.同时,在复坐标系下可以更方便的进行坐标变换.使用镜... 详细信息

基于复变函数理论,研究了出平面剪切波在非均匀直角域内的传播特性.介质的非均匀性体现在剪切模量是与空间坐标有关的函数.引入一个位移辅助函数和一对映射函数用以辅助推导控制方程.同时,在复坐标系下可以更方便的进行坐标变换.使用镜像法构造了介质内反射波和散射波的波场表达式.根据圆孔处的边界条件求解了散射波中的未知系数,并给出了直角域空间内波场的解析表达式.在动力学分析中,刚度可以用剪切模量来表示.在算例分析中,讨论了位移幅值和动应力集中系数对非均匀参数,参考波数以及圆孔位置的依赖关系.

关键词：动应力集中系数复变函数理论散射波辅助函数圆孔剪切模量映射函数镜像法