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豆浆固形物含量及浆液深度对腐竹生产及品质的影响

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食品与机械 2024年第4期40卷 196-202页

作者：张炎任广跃段续刘文超王喆河南科技大学食品与生物工程学院河南洛阳471023 粮食储藏安全河南省协同创新中心河南郑州450001

目的:确定腐竹高效优质生产适宜的豆浆固形物含量和浆液深度。方法:探究豆浆固形物含量和浆液深度对腐竹得率、成膜速率、营养成分、机械性能、蒸煮损失率和复水比等的影响。结果:当豆浆固形物含量为6%,豆浆浆液深度为6 cm时,腐竹得率(3... 详细信息

目的:确定腐竹高效优质生产适宜的豆浆固形物含量和浆液深度。方法:探究豆浆固形物含量和浆液深度对腐竹得率、成膜速率、营养成分、机械性能、蒸煮损失率和复水比等的影响。结果:当豆浆固形物含量为6%,豆浆浆液深度为6 cm时,腐竹得率(34.68%)和营养物质含量最高,其蛋白质含量为51.05%,脂肪含量为23.42%,且抗拉强度和复水性较好,分别为3.74 MPa和3.80 g/g。结论:综合考虑腐竹得率、成膜速率和食用品质等指标,建议采用豆浆固形物含量6%,豆浆浆液深度6 cm进行腐竹的高效优质生产。

关键词：腐竹豆浆固形物含量豆浆浆液深度高效优质

咖啡豆红外喷动床干燥对其粉末物性品质、干燥能耗及挥发性成分的影响

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食品与发酵工业 2024年第5期50卷 199-207页

作者：余祖艳任广跃许韩山段续李琳琳岳燕霞樊小静王喆河南科技大学食品与生物工程学院河南洛阳471000 粮食储藏安全河南省协同创新中心河南郑州450001 杭州市临平区质量计量监测中心浙江杭州311199 漯河食品职业学院食品工程系河南漯河462300

为获得高品质干燥咖啡豆,采用红外喷动床组合干燥技术对咖啡豆进行干燥处理,研究不同进口温度和进口风速对咖啡粉色泽、堆积密度、休止角、得粉率、持水能力和水溶性指数、微观结构、干燥能耗及挥发性成分的影响。结果表明,提高进口温... 详细信息

为获得高品质干燥咖啡豆,采用红外喷动床组合干燥技术对咖啡豆进行干燥处理,研究不同进口温度和进口风速对咖啡粉色泽、堆积密度、休止角、得粉率、持水能力和水溶性指数、微观结构、干燥能耗及挥发性成分的影响。结果表明,提高进口温度和进口风速可以加快干燥速率,缩短干燥时间,降低干燥能耗。采用顶空固相微萃取-气相色谱质谱联用共检测出7大类(酸类、酯类、醛类、醇类、酮类、杂环类及其他类)挥发性化合物,其中酸类、酯类、醇类、杂环类4类为咖啡豆主要挥发性化合物且含量较高。综合对比得出最佳干燥条件为进口温度75℃,进口风速7.5 m/s,在此条件下,L*值和堆积密度取得最大值,分别为106.59和0.65 g/mL,休止角取得最小值36.87°,得粉率、持水能力和水溶性指数取得最大值,分别为43.43%、5.4 g/g和41.27%,干燥能耗取得最小值336.53 kJ/g,形态结构保存较为完整,壁面光滑平整,检测到的挥发性成分种类最高达70种,含量为38 487.028 49 ng/g(以干基计),咖啡豆综合品质最佳。该研究可为红外喷动床干燥技术在咖啡豆干燥加工及工业化生产中的应用提供参考。

关键词：红外喷动床干燥生咖啡豆物性品质挥发性成分顶空固相微萃取-气相色谱质谱联用

基于资源环境异质性的专精特新企业发展研究:以浙江省为例

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贵阳学院学报（社会科学版） 2024年第4期19卷 110-116页

作者：葛振峰王端旭宁波财经学院工商管理学院浙江宁波315175 浙江大学管理学院浙江杭州310058

专精特新企业成长对解决制造业关键核心技术的“卡脖子”问题和强化产业链韧性具有重要意义,也是一个地区制造业水平的集中表现。本文梳理了浙江省专精特新企业发展的现状,以杭州和宁波为例,通过对环境资源的分析,采用独立t检验分析了... 详细信息

专精特新企业成长对解决制造业关键核心技术的“卡脖子”问题和强化产业链韧性具有重要意义,也是一个地区制造业水平的集中表现。本文梳理了浙江省专精特新企业发展的现状,以杭州和宁波为例,通过对环境资源的分析,采用独立t检验分析了两地专精特新企业发展的资源异质性。研究指出,企业应根据区域资源环境特点制定战略;政府需要根据资源环境的异质性特征制定差异化的政策,以促进区域资源高效配置,共同推动专精特新企业的高质量发展。

关键词：专精特新企业资源环境异质性资源环境

A new benzylisoquinoline alkaloid from stems of Nelumbo nucifera

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Chinese Chemical Letters 2008年第3期19卷 308-310页

作者： xu Hong duan Jian Qin Jiang Department of Natural Medicine Chemistry China Pharmaceutical University Nanjing 210038 China

A new benzylisoquinoline alkaloid, named nelumstemine （1）, 1-（4＇-hydroxybenzoyl）-6,7-dimethoxy-3,4-dihydroisoquinoline, was isolated from the stems of Nelumbo nucifera Geartn. Its structure was established on the... 详细信息

关键词： Nelumbo nucifera Geartn Nelumstemine Dihydroisoquinoline Benzylisoquinoline alkaloids

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微波冻干预制面条干燥特性及品质特征研究

食品与发酵工业 2024年第9期50卷 262-267页

作者：苗峻伟段续任广跃刘文超李琳琳曹伟伟河南科技大学食品与生物工程学院河南洛阳471000 河南省农产品干燥装备工程技术研究中心河南洛阳471000

为探究微波冷冻干燥对预制面条品质的影响,该文以热风干燥作为对照试验,对比分析了2种干燥方式下面条的干燥特性,干燥后面条的复水性能、色泽、煮制特性和微观结构以及复水后面条的质构特性。结果表明,微波冷冻干燥速率曲线更加平缓,主... 详细信息

为探究微波冷冻干燥对预制面条品质的影响,该文以热风干燥作为对照试验,对比分析了2种干燥方式下面条的干燥特性,干燥后面条的复水性能、色泽、煮制特性和微观结构以及复水后面条的质构特性。结果表明,微波冷冻干燥速率曲线更加平缓,主要为恒速和降速干燥阶段;微波冷冻干燥预制面条微观结构具有明显的孔隙,比热风干燥产品复水率更高。微波冷冻干燥预制面条色泽优于热风干燥产品,但微波冷冻干燥预制面条煮制损失率高于热风干燥产品。2.0 W/g功率密度下制备的微波冷冻干燥预制面条综合评分最高,适用于高品质微波冻干预制面条生产中。

关键词：微波冷冻干燥预制面条干燥特性品质特征主成分分析

Effects of different pretreatments on the pore structure of Chinese yam during microwave freeze drying

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 232-237页

作者： Hui Wang xu duan Lujie Zhao Liuliu duan Guangyue Ren School of Chemical Engineering and Pharmacy Henan University of Science and TechnologyLuoyangHenan 471023China College of Food and Bioengineering Henan University of Science and TechnologyLuoyangHenan 471023China Henan Cooperative Innovation Center for Grain Storage Safety Zhengzhou 450001China

In order to explore the effects of different pretreatments on the pore structure of Chinese yam during Microwave Freeze Drying(MFD),the samples were treated by typical drying pretreatments including osmosis,blanching and ultrasound,and compared with the untreated *** results showed that the pretreatment had significant impacts on the porosity of MFD Chinese *** pretreatment could obtain the highest open porosity,and the internal pore network structure of the material showed a uniform sponge *** shape of pores obtained by blanching pretreatment was the most *** pore network structure obtained by different pretreatments could result in various product texture and rehydration,which implied that pretreatment methods should be carefully selected according to actual *** these pretreatments could improve the open porosity of MFD Chinese yam,which result in a better rehydration *** them,ultrasonic treatment is worth further investigating.

关键词： microwave freeze drying pretreatment pore network structure Chinese yam porosity

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玉米粮堆通风干燥过程中热湿传递模拟及试验

农业工程学报 2024年第12期40卷 264-275页

作者：吴帅强任广跃张永立朱广飞白岩松师建芳谢奇珍邵广段续河南科技大学食品与生物工程学院洛阳471023 农业农村部规划设计研究院北京100125 农业农村部农产品产地初加工重点实验室北京100121 辽宁工业大学机械工程与自动化学院锦州121001

为了准确预测玉米粮堆通风干燥过程中的热湿分布变化,明确适宜的通风条件。该研究基于干储一体仓,运用局域热非平衡理论,考虑玉米呼吸热,建立玉米粮堆通风干燥热湿传递模型,探究不同因素对通风干燥过程的影响,并进行通风干燥试验,分析... 详细信息

为了准确预测玉米粮堆通风干燥过程中的热湿分布变化,明确适宜的通风条件。该研究基于干储一体仓,运用局域热非平衡理论,考虑玉米呼吸热,建立玉米粮堆通风干燥热湿传递模型,探究不同因素对通风干燥过程的影响,并进行通风干燥试验,分析玉米含水率、温度以及粮堆空气的温湿度分布变化情况。结果表明:建立的热湿传递模型可有效模拟仓内玉米粮堆通风干燥的过程,玉米监测点的温度、含水率模拟值与试验值的相对误差分别为1.4%~12.1%、0.3%~14.5%,平均值分别为4.8%、6.5%;通风前期玉米粮情存在一定的不均匀性,内层玉米的升温速率与干燥速率快于外层。随着通风过程的持续,上述不均匀性逐渐降低。综合考虑不同条件下玉米温度和含水率的变化,适宜的通风条件为空气相对湿度低于75%、通风风速为0.09~0.23 m/s,风温随大气条件而定。玉米通风干燥中试试验的单位能耗为890.2 kJ/kg,节能效果显著。研究结果可为玉米通风干燥技术和操作工艺的优化提供理论支持。

关键词：玉米热湿传递模拟含水率通风干燥

Dental stem cell-derived extracellular vesicles as promising therapeutic agents in the treatment of diseases

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International Journal of Oral Science 2022年第1期14卷 31-39页

作者： Ye Li xu duan Yinxue Chen Bingyun Liu Gang Chen The State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-MOST)&Key Laboratory of Oral Biomedicine Ministry of Education School and Hospital of StomatologyWuhan UniversityWuhanChina Department of Oral and Maxillofacial Surgery School and Hospital of StomatologyWuhan UniversityWuhanChina Frontier Science Center for Immunology and Metabolism Wuhan UniversityWuhanChina

Dental stem cells(DSCs), an important source of mesenchymal stem cells(MSCs), can be easily obtained by minimally invasive procedures and have been used for the treatment of various diseases. Classic paradigm attributed the mechanism of their therapeutic action to direct cell differentiation after targeted migration, while contemporary insights into indirect paracrine effect opened new avenues for the mystery of their actual low engraftment and differentiation ability in vivo. As critical paracrine effectors, DSC-derived extracellular vesicles(DSC-EVs) are being increasingly linked to the positive effects of DSCs by an evolving body of in vivo studies. Carrying bioactive contents and presenting therapeutic potential in certain diseases, DSC-EVs have been introduced as promising treatments. Here, we systematically review the latest in vivo evidence that supports the therapeutic effects of DSC-EVs with mechanistic studies. In addition, current challenges and future directions for the clinical translation of DSC-EVs are also highlighted to call for more attentions to the(Ⅰ) distinguishing features of DSC-EVs compared with other types of MSC-EVs,(Ⅱ)heterogeneity among different subtypes of DSC-derived EVs,(Ⅲ) action modes of DSC-EVs,(Ⅳ) standardization for eligible DSC-EVs and(Ⅴ) safety guarantee for the clinical application of DSC-EVs. The present review would provide valuable insights into the emerging opportunities of DSC-EVs in future clinical applications.

关键词： therapeutic treatment insight

Energetic Particle Physics on the HL-2A Tokamak: A Review

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Chinese Physics Letters 2021年第3期38卷 55-68页

作者： Pei-Wan Shi Wei Chen xu-Ru duan Southwestern Institute of Physics Chengdu 610041China Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

Interaction between shear Alfvén wave(SAW) and energetic particles(EPs) is one of major concerns in magnetically confined plasmas since it may lead to excitation of toroidal symmetry breaking collective instabilities,thus enhances loss of EPs and degrades plasma confinement. In the last few years, Alfvénic zoology has been constructed on HL-2A tokamak and series of EPs driven instabilities, such as toroidal Alfvén eigenmodes(TAEs),revered shear Alfvén eigenmodes(RSAEs), beta induced Alfvén eigenmodes(BAEs), Alfvénic ion temperature gradient(AITG) modes and fishbone modes, have been observed and investigated. Those Alfvénic fluctuations show frequency chirping behaviors through nonlinear wave-particle route, and contribute to generation of axisymmetric modes by nonlinear wave-wave resonance in the presence of strong tearing modes. It is proved that the plasma confinement is affected by Alfvénic activities from multiple aspects. The RSAEs resonate with thermal ions, and this results in an energy diffusive transport process while the nonlinear mode coupling between core-localized TAEs and tearing modes trigger avalanche electron heat transport events. Effective measures have been taken to control SAW fluctuations and the fishbone activities are suppressed by electron cyclotron resonance heating. Those experimental results will not only contribute to better understandings of energetic particles physics, but also provide technology bases for active control of Alfvénic modes on International Thermonuclear Experimental Reactor(ITER) and Chinese Fusion Engineering Testing Reactor(CFETR).

关键词： wave transport collective