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枸杞粉对白鲢鱼糜凝胶品质的影响

食品与发酵工业 2024年第2期50卷 168-176页

作者：郑赵敏徐巧玲郑洪梨刘俊辰施咏淇姚春霞肖春元汪兰湖北经济学院烹饪与营养学系湖北武汉430205 湖北省农业科学院农产品加工与核农技术研究所湖北武汉430064

该研究以冷冻白鲢鱼糜为实验原料,向其中添加枸杞粉(wolfberry powder,WP),分析不同添加量[0.25%、0.5%、0.75%、1%、1.5%(质量分数)]的WP对白鲢鱼糜凝胶持水性、蒸煮损失率、白度值、水分分布、凝胶特性、微观结构、感官评价及气味特... 详细信息

该研究以冷冻白鲢鱼糜为实验原料,向其中添加枸杞粉(wolfberry powder,WP),分析不同添加量[0.25%、0.5%、0.75%、1%、1.5%(质量分数)]的WP对白鲢鱼糜凝胶持水性、蒸煮损失率、白度值、水分分布、凝胶特性、微观结构、感官评价及气味特征的影响。结果表明,随着WP含量的增加,鱼糜凝胶的持水性、硬度、咀嚼性和凝胶强度都表现出先增大后减小的趋势,当WP的添加量为0.5%时达到最大,分别为78.55%、(2716.77±75.76)g、(2185.15±32.46)g和1087 g·cm;而蒸煮损失率则表现出先减小后增大的趋势,在0.5%的添加量时,蒸煮损失率最小,为7.49%。在鱼糜中加入WP后,可以减少鱼糜凝胶中自由水的比例,增加不易流动水的比例,使鱼糜凝胶保留更多水分,且当WP在最适添加量0.5%时,鱼糜凝胶中只检测到结合水和不易流动水,未检测到自由水。适量WP的添加会增强鱼糜凝胶的网络结构,使其变得更加致密均匀。WP的添加会减小鱼糜凝胶的白度值和色泽评分,但在最适添加量0.5%时,其颜色总体可接受。此外,感官评价和电子鼻分析结果表明,当WP在最适添加量0.5%时,可以显著改善鱼糜凝胶的风味品质。研究结果可为生产高品质的鱼糜产品提供理论依据。

关键词：枸杞粉白鲢鱼糜持水性微观结构凝胶品质

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食品调料中微塑料的特征分析

安徽农学通报 2024年第15期30卷 105-108页

作者：杨海锋刘海燕林淼姚春霞农产品质量标准与检测技术研究所/上海市农业科学院上海201403

为探索食品调料中微塑料的特征,本文对来自不同地区、采用不同原料加工的34个调料样品中微塑料的丰度、大小、形状和材质等进行研究。结果表明,供试调料样品中,微塑料的平均丰度为1.75个/100 g;微塑料的粒径均小于5 mm;纤维状材质的微... 详细信息

为探索食品调料中微塑料的特征,本文对来自不同地区、采用不同原料加工的34个调料样品中微塑料的丰度、大小、形状和材质等进行研究。结果表明,供试调料样品中,微塑料的平均丰度为1.75个/100 g;微塑料的粒径均小于5 mm;纤维状材质的微塑料占比较大,其次是薄膜微塑料和颗粒状微塑料,占比分别为56%、35%和9%;微塑料的材质分别为人造纤维、聚乙烯、聚丙烯、聚酯纤维和烯烃类纤维。研究为食品调料品质提高和食品安全保障提供参考。

关键词：食品安全微塑料调料丰度特征分析

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Performance Analysis of Plant Shells/PVC Composites under Corrosion and Aging Conditions

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Journal of Renewable Materials 2024年第5期12卷 993-1006页

作者： Haoping yao Xinyu Zhong chunxia He College of Engineering Nanjing Agricultural UniversityNanjing210031China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

To make full use of plant shellﬁbers(rice husk,walnut shell,chestnut shell),three kinds of wood-plastic com-posites of plant shellﬁbers and polyvinyl chloride(PVC)were prepared.X-ray diffraction analysis was carried out on three kinds of plant shellﬁbers to test their *** aging process of the composites was conducted under 2 different *** was artiﬁcial seawater immersion and xenon lamp irradiation,and the other one was deionized water spray and xenon lamp *** mechanical properties(tensile strength,ﬂexural strength,impact strength),changes in color,water absorption,Fourier transform infrared spectroscopy(FTIR),and microstructures of the composites before and after the two aging experiments were *** results showed that the chestnut shell had the highest crystallinity,which was 42%.The chestnut shell/PVC composites had the strongest interface bonding,the least internal defects,and the best general mechanical properties among the three *** tensile strength,bending strength and impact strength were 23.81 MPa,34.12 MPa,and 4.32 KJ·m^(-2),*** the two aging conditions,artiﬁcial seawater immersion and xenon lamp irradiation destroyed the quality of the combination of plant shellﬁbers and PVC,making the internal defects of the composites *** made the water absorption ability and changes in the color of the composites more obvious and led to a great decrease in the mechanical *** general mechanical properties of the chestnut shell/PVC composites were the best,but their water absorption ability changed more obviously.

关键词： Plant shellﬁbers polyvinyl chloride wood-plastic composites artiﬁcial seawater immersion deionized water spray xenon lamp irradiation

Estimating the air exchange rates in naturally ventilated cattle houses using Bayesian-optimized GBDT

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International Journal of Agricultural and Biological Engineering 2023年第1期16卷 73-80页

作者： Luyu Ding Lei E Yang Lyu chunxia yao Qifeng Li Shiwei Huang Weihong Ma Ligen Yu Ronghua Gao Information Technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China National Innovation Center of Digital Technology in Animal Husbandry Beijing 100097China Beijing Technology Innovation Strategic Alliance for Intelligence Internet of Things Industry in Agriculture Beijing 100097China Department of Agricultural Structure and Bioenvironmental Engineering College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China

It is challenging to estimate the air exchange rate(AER)dynamically in naturally ventilated livestock buildings such as dairy houses due to the influence of complex and variable outdoor environmental factors,large opening ratios,and the confusion of inflow and outflow at *** makes it difficult to efficiently regulate the opening ratio to meet the ventilation requirements in naturally ventilated livestock *** this study,the air exchange rates of naturally ventilated cattle houses(NVCHs)in different seasons and opening ratios were obtained through field measurements and computational fluid dynamics(CFD)simulations.A fast and efficient machine learning framework was proposed and examined to predict AER based on the gradient boosting decision tree(GBDT)combined with Bayesian *** with commonly used machine learning models such as multilayer perceptrons(MLPs)and support vector machines(SVMs),the proposed GBDT model has higher prediction accuracy and can avoid falling easily into local *** with the existing mechanical model based on the Bernoulli equation,the proposed GBDT model showed a slightly higher prediction than the mechanistic model and was much easier to use in AER estimation when inputting easily collected environmental factors in practical *** Bayesian optimization could dramatically reduce the computing time when determining the optimal hyperparameter for establishing the GBDT model,dramatically saving on computing *** on the Bayesian optimized GBDT model,the desirable opening ratio of the side curtain can be determined for automatically regulating the AER of cattle houses in future applications.

关键词： natural ventilation Bayesian GBDT air exchange rate cattle house

Effects of Different Combinations of Red and Blue Light on Morphology and Photosynthetic Characteristic of Tomato Seedlings

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Agricultural Biotechnology 2018年第5期7卷 54-57页

作者： Hong WANG chunxia yao Ying WANG Weimin ZHU Protected Horticultural Research Institute Shanghai Academy of Agricultural SciencesShanghai 201403China Key Laboratory of Protected Horticultural Technology Shanghai 201403China Institute for Agro-food Standards and Testing Technology Shanghai Academy of Agricultural SciencesShanghai 201403China

Blue and red light are spectral wavelengths more effective for plants. The effects of different ratios of red and blue light （R/B=2, R/B=4, R/B=8, R/B=12） provided by LEDs on morphology and photosynthetic characteristics of tomato seedlings were studied. The results showed that plant height, stem diameter, fresh weight, dry weight, seedling index and G value increased with the increase of R/B ratio until 8. On the contrary, SPDA value decreased with the increase of R/B ratio. Photosynthetic characteristics were measured by CO 2 assimilation （ Pn ）, stomatal conductance （ gs ） and intracellular CO 2 concentration （ Ci） . Pn and gs decreased with the increase of R/B ratio. Furthermore, similar trend was investigated in photochemical quenching （qP） and electron transport rate （ETR）. Results of this study suggest that compared with white LED, appropriate combination of red and blue light can enhance plant growth and photosynthetic characteristics, and the optimal blue/red ratio for tomato growth was R/B=8.

关键词： Red and blue light Tomato Morphology Photosynthetic characteristics

Accurate reconstruction algorithm for bilateral differential phase signals

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Radiation Detection Technology and Methods 2021年第3期5卷 474-479页

作者： Qili He Yan Wang Panyun Li chunxia yao Jin Zhang Tianyu Fu Kai Zhang Qingxi Yuan Wanxia Huang Shanfeng Wang Peiping Zhu Peng Liu Platform of Advanced Photon Source Technology R&D Laboratory of X-Ray Optics and TechnologyBeijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science(UCAS) Beijing 100049China

Background The differential phase computed tomography(DP-CT)imaging is a kind of X-ray-phase-based CT methods,which is widely used in various X-ray imaging *** present,a collection of projections with the horizontal direc-tion(perpendicular to the sample rotation axis)DP information is often acquired in *** an ideal experiment,if the background is zero,then we can accurately reconstruct the information of each direction of the sample with horizontal data ***,background information will produce streaking artifacts to affect the resolution in directions other than the horizontal *** To mitigate the streaking artifacts in the conventionally reconstructed DP-CT *** This study develops a novel analytical DP-CT reconstruction framework by jointly using the bilateral DP information obtained along two perpendicular *** addition,a new data acquisition scheme is also proposed to quickly acquire the bilateral DP signal without the need of changing the direction of refraction signal *** Experimental results demonstrate that this new algorithm is able to greatly reduce the streaking artifacts on DP-CT images.

关键词： X-ray phase Streaking artifacts Bilateral

A preliminary study on interaction of Hg and Se in Sedum alfredii Hance

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Chinese Journal Of Geochemistry 2006年第B8期25卷 127-128页

作者： Xuebin YIN chunxia yao De BI Yongming LUO Jing SONG Soil and Environment Bioremediation Research Center Nanjing Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China

Pollution characteristics of the rivers in suburban Shanghai

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Journal of Geographical Sciences 2005年第1期15卷 29-36页

作者： yaochunxia CHENZhenlou XUShiyuan LILing WANGLi LINShanshan Geo-informationScienceKeyLaboftheMinistryofEducation EastChinaNormalUniversityShanghai200062China

Forty middle and small rivers in three towns of Fengjing, Songjiang and Zhujiajiao of suburban Shanghai were chosen as sampling sites for water quality research. Measurement results of DO, CODCr, TP, TN and so on show that the rivers are under heavy eutropic conditions, which are several times greater than the critical values of the worst level (Type V) of water. Water pollution situation has different temporal and spatial characteristics. Non-point pollution, such as village domestic sewage, farmland runoff, livestock feces, has become the primary source of pollution of the middle and small rivers in suburban Shanghai.

关键词： suburban Shanghai water quality pollution characteristics

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闭环真空压力调节阀的设计

制造技术与机床 2006年第6期 23-25页

作者：幺春霞薛志杰河北科技大学河北石家庄050054 北京创威纳科技有限公司北京100085

通过难点分析、计算,介绍闭环真空压力调节阀的设计要点与方案确定。经生产实践应用证明,该调节阀设计方案切实可行。

关键词：真空压力调节阀流导 PLC控制