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Finite element analysis of corn kernel damage: a viscoelastic model approach for impact-induced damage prediction

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2025年第7期105卷 3993-4004页

作者： Zhao, Xuelin zhang, Qiang Fang, xuwen zhang, Jinsong Feng, Weijing zhang, Li Zhou, Deyi Yu, Chunsheng Wang, Hao Gao, Xiaodi Zhou, Haigen Wu, Xinling Jilin Univ Coll Biol & Agr Engn Changchun 130022 Peoples R China

BACKGROUNDIn the present study, we address the quality degradation of corn during post-harvest processing by developing a viscoelastic composite model to predict kernel damage during post-harvest processing. The model, based on high-resolution scanning and inverse modeling techniques, provides an accurate representation of the complex internal components of corn kernels, which allows for the analysis of their stress response and damage susceptibility trends under different impact *** results show that the viscoelastic model has a relative error of 2.4% compared to the drop test data, thus demonstrating that the viscoelastic model has a very high accuracy in predicting impact damage and is able to accurately localize the flour-like endosperm as the main region of impact damage. The model showed a high correlation (0.99) between predicted and experimental damage rates by response surface *** damage during processing is reduced by reducing the proportion of flour-like endosperm in maize kernels. A new method for reducing damage during food handling and processing operations is proposed, providing an important reference for improving kernel durability and contributing to the development of gentler processing techniques to improve the quality of maize products. (c) 2025 Society of Chemical Industry.

关键词： viscoelastic composite model collision damage finite element method burgers model high moisture corn kernel

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谈视频编辑的非线性编辑网络技术

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六盘水师范高等专科学校学报 2004年第6期16卷 33-34,51页

作者：张续文六盘水师范高等专科学校贵州水城553004

随着数字视频技术和多媒体技术的发展,非线性编辑网络即将进入一个新阶段。新型大容量硬盘、统一标准数字接口、新型的视频总线等等都大大提高了视频数据传输速度和工作效率,这些新硬件和软件技术的应用,促进非线性编辑系统的实现。

关键词：非线性编辑系统硬盘容量磁盘冗余阵列传输媒体

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产学研创新主体适应性行为演进路径研究——基于扎根理论的案例研究

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中国科技论坛 2023年第9期 38-47,101页

作者：何声升迟景明张旭雯大连理工大学高等教育研究院辽宁大连116024

产学研创新生态系统中创新主体适应性行为是实现协同创新的重要方式。基于复杂适应系统理论分析产学研创新主体适应性行为内在逻辑,即产学研创新主体的适应性行为是主体自我选择、自我调节的主动建构过程。产学研创新主体相互适应,生成... 详细信息

产学研创新生态系统中创新主体适应性行为是实现协同创新的重要方式。基于复杂适应系统理论分析产学研创新主体适应性行为内在逻辑,即产学研创新主体的适应性行为是主体自我选择、自我调节的主动建构过程。产学研创新主体相互适应,生成复杂适应系统的复杂动态模式,推动着产学研创新生态系统的不断演化。本文围绕D大学和S集团的探索性案例,采用扎根理论凝练出产学研创新主体适应性行为需经历创造性搜寻、适应性选择、自觉性变异3个阶段的演进路径。因而产学研创新主体适应性行为过程,就是在创造性搜寻、适应性选择、自觉性变异的共同作用下螺旋式前进的过程。

关键词：产学研创新主体创新资源适应性行为创新生态系统

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Extracellular Vesicles Separation and Biomedical Application Based on Affinity Recognition and Antifouling Coating Bifunctional Microsphere

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ANALYTICAL CHEMISTRY 2025年第8期97卷 4542-4548页

作者： He, Yuxing Kang, Jia Yang, xuwen Deng, Nan Hui, Lingyun Yu, Yunxuan Bian, Yangyang Tao, Fufang Duan, Xinrui zhang, Jing Shaanxi Normal Univ Sch Chem & Chem Engn Key Lab Analyt Chem Life Sci Shaanxi Prov Xian 710119 Shaanxi Peoples R China Xi An Jiao Tong Univ Instrumental Anal Ctr Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Affiliated Hosp 1 Xian 710061 Shaanxi Peoples R China Northwest Univ Coll Life Sci Key Lab Resource Biol & Modern Biotechnol Western Xian 710069 Shaanxi Peoples R China Shaanxi Prov Drug Tech Evaluat Ctr Xian 710065 Shaanxi Peoples R China

Extracellular vesicles (EVs) are crucial mediators in various physiological and pathological processes, facilitating intercellular communication and offering potential as diagnostic disease markers. However, existing EVs separation methods have limitations that hinder their clinical application. In this study, we present a novel approach using bifunctional silica microspheres (SiO2-PTB-PS) for the specific, nondestructive isolation of EVs from complex biological media. The isolated EVs were subsequently used for direct cancer detection in clinical samples. The SiO2-PTB-PS microspheres, functionalized with a phosphatidylserine (PS) recognition peptide (PSpep), specifically bound to PS on the EVs surface. Additionally, an anti-adhesion coating on the silica microspheres minimized protein contamination, enhancing purity. This affinity-based recognition and antifouling strategy ensured high-purity EVs separation. Furthermore, we developed a detection system combining SiO2-PTB-PS microspheres with surface-enhanced Raman scattering (SERS) nanoprobes to identify protein tyrosine kinase 7 (PTK7) and epithelial cell adhesion (EpCAM) on the EVs membrane, achieving 80% precision in distinguishing cancer patients from healthy donors. The SiO2-PTB-PS microsphere system shows significant promise as a biotechnology tool, advancing the clinical application of EVs-based diagnostics.

关键词： Microspheres

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Enhancing CO2 hydrate sequestration through underlying methane hydrate production: A novel strategy for carbon storage

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ENERGY 2025年 326卷

作者： Li, Yuxuan zhang, Zhaobin zhang, Bo Chalaturnyk, Rick Li, Shouding He, Jianming Xie, Zhuoran Bian, Hang Li, Xiao Lu, Cheng Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China Univ Alberta Donadeo Innovat Ctr Engn Dept Civil & Environm Engn Edmonton AB T6G 1H9 Canada China Geol Survey Minist Nat Resources Beijing 100037 Peoples R China

Seafloor CO2 sequestration in the form of gas hydrates offers expansive geological opportunities for carbon neutrality strategies. Guided by phase equilibrium conditions, this study employs a self-developed multi-physical simulator to investigate how methane hydrate production beneath a CO2 sequestration zone can facilitate carbon storage. A dual-horizontal-well model is constructed and validated based on field measurements. Through numerical simulations, the effects of methane hydrate production timing, CO2 injection rate, and injection depth on carbon sequestration over a 100,000-year timescale are examined. Two novel metrics-sequestration efficiency and safe distance-are introduced. Results indicate that extracting methane hydrates in the later stages of CO2 injection is optimal. Furthermore, an efficient sequestration window exists for both injection rate and depth. By exploring the relationship between sequestration efficiency and storage safety, this study provides a new perspective for implementing CO2 sequestration pathways.

关键词： CO 2 sequestration Methane hydrate production Multi-physical Sequestration efficiency Storage safety

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Fabrication of NiZn bimetallic oxides catalysts supported on carbon black waste for catalytic pyrolysis of fatty acid

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APPLIED CATALYSIS A-GENERAL 2023年 668卷

作者： zhang, Yang zhang, xuwen Guo, Fangsong Tan, Kok Bing Wang, Youting Sun, Kang Rao, Xiaoping zhang, Xiaodong Zhan, Guowu Huaqiao Univ Acad Adv Carbon Convers Technol Coll Chem Engn Fujian Prov Key Lab Biomass Low Carbon Convers 668 Jimei Ave Xiamen 361021 Fujian Peoples R China Jimei Univ Coll Marine Equipment & Mech Engn 185 Yinjiang Rd Xiamen 361021 Fujian Peoples R China Chinese Acad Forestry CAF Inst Chem Ind Forest Prod 16 Suojin F Village Nanjing 210042 Jiangsu Peoples R China

Herein, NiZn bimetallic oxides derived from calcination treatment of metal-organic frameworks (MOFs) were successfully loaded onto the carbon black waste as support obtained from the oil refinery. The resulting hybrids could serve as environmentally friendly and cost-effective catalysts for the deoxygenation of biomass-derived fatty acids under an inert atmosphere. An online pyrolysis-gas chromatography/mass spectrometry (Py-GC/ MS) system was employed to evaluate their deoxygenation performance. The optimized catalysts demonstrated remarkably high stearic acid conversion of 99.6% and selectivity towards C8-C17 olefins of 57.2%. Furthermore, these catalysts with varying metal loadings also exhibited excellent efficiency in deoxygenation reactions of other types of fatty acids, such as myristic acid and palmitic acid, achieving conversion exceeding 85% and selectivities towards olefins of ca. 50%. When converting coconut oil, the supported NiZn bimetallic oxides showed excellent selectivity towards olefins (>60%). Furthermore, in-situ DRIFTS results suggest that fatty alcohols might be the key intermediates in the deoxidation reactions of fatty acid. This study not only demonstrates the great potential for obtaining valuable chemicals from biomass but also provides some insights into the fabrication of catalyst materials by using industrial solid waste.

关键词： Carbonaceous residue Metal oxide Stearic acid Deoxygenation reaction Resource utilization Olefin

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Occurrence, transfer rule, and dietary risk assessment of aflatoxins in medicinal and edible seeds

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FOOD BIOSCIENCE 2025年 63卷

作者： Lv, Jianxin zhang, Huiru Wang, xuwen Luo, Jiaoyang Wang, Yudan Kong, Dandan Wang, Chuang Guo, Mengyue Yang, Meihua Chinese Acad Med Sci Inst Med Plant Dev Key Lab Bioact Subst & Resources Utilizat Chinese Minist Educ Beijing 100193 Peoples R China Peking Union Med Coll Beijing 100193 Peoples R China Chinese Acad Med Sci Hainan Branch Inst Med Plant Dev Haikou 570311 Peoples R China

The last three decades have seen a rise in the use of herbal remedies and supplements, with more than 80% of the world's population relying on them for primary care. However, aflatoxin contamination in herbal remedies may constitute a risk to human health. In this study, a simple and robust method for the simultaneous detection of aflatoxins in four types of medicinal and edible seeds was developed by using UFLC-MS/MS combined with QuECHERS pretreatment. Meanwhile, the transfer rule of the aflatoxins in medicinal and edible seeds during the decoction process was explored, followed by dietary risk assessment based on Monte Carlo simulation. Results showed that aflatoxin contamination was found in 80.6% of the samples (62/77), with the contamination levels of 0.04-258.72 mu g/kg. Notably, high levels of aflatoxins were found in Ziziphi Spinosae Semen and Platycladi Semen, while low aflatoxin transfer rates (1.13%-11.86%) were observed during the decoction process. The estimated daily intake (EDI) of AFB1 could reach 15.314 and 0.333 ng/kg bw/day by ingesting aflatoxinsusceptible Ziziphi Spinosae Semen and Platycladi Semen, respectively. The population cancer risks ranged from 3.34 x 10- 8 to 2.86 x 10-4 hepatocellular carcinoma cases per 105 persons per year. The probabilistic risk assessment indicated a short-term and long-term health concern of intaking these two medicinal and edible seeds contaminated by aflatoxins. This study revealed the occurrence and transfer pattern of aflatoxins in the medicinal and edible seeds and evaluated the risks of their dietary exposure, providing a basis for their safe use.

关键词： Medicine food homology Aflatoxin Detection Transfer rule Risk assessment

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Cascading oxidoreductases-like nanozymes for high selective and sensitive fiuorescent detection of ascorbic acid

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Chinese Chemical Letters 2025年第4期36卷 627-632页

作者： Ying Wang Hong Yang Caixia Zhu Qing Hong xuwen Cao Kaiyuan Wang Yuan Xu Yanfei Shen Songqin Liu Yuanjian zhang Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Devices Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical ResearchSchool of Chemistry and Chemical EngineeringMedical SchoolSoutheast UniversityNanjing 211189China

Compared with natural enzymes, nanozymes have the advantages of high stability and low cost;however,selectivity and sensitivity are key issues that prevent their further development. In this study, we report a cascade nanozymatic system with significantly improved selectivity and sensitivity that combines more substrate-specific reactions and sensitive fiuorescence detection. Taking detection of ascorbic acid(AA)as an example, a cascade catalytic reaction system consisting of oxidase-like N-doped carbon nanocages(NC) and peroxidase-like copper oxide(Cu O) improved the reaction selectivity in transforming the substrate into the target product by more than 1200 times against the interference of uric acid. The cascade catalytic reaction system was also applicable for transfer from open reactors into a spatially confined microfiuidic device, increasing the slope of the calibration curves by approximately 1000-fold with a linear detection range of 2.5 nmol/L to 100 nmol/L and a low limit of detection of 0.77 nmol/L. This work offers a new strategy that achieves significant improvements in selectivity and sensitivity.

关键词： Nanozyme Fluorescence Selectivity Sensitivity Ascorbic acid

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国外引进离心机差速器故障分析及国产化改造

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机械工程师 2021年第6期 139-140,143页

作者：张绪文中石油四川石化公司成都611930

针对一台国外引进离心机差速器频繁损坏的问题,研究了其轴承及齿轮损坏样貌、差速器结构,对齿轮、轴承承载力进行校核计算,发现其结构、齿轮设计及轴承选型均存在问题。经国产化改造后,运行效果良好,寿命延长了10倍以上。

关键词：差速器故障分析国产化改造

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Research on alkali corrosion resistance and life prediction of glass fiber recycled concrete based on grey system theory

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STRUCTURES 2025年 75卷

作者： Yang, Wenrui Huang, Yuewen Wu, Weiwei Huang, Weihua Xiong, Xiaolong Li, Chengwei Zhong, xuwen Liu, Liai Zhou, Hai zhang, Xun East China Univ Technol Sch Civil & Architectural Engn Nanchang 330012 Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hung Hom Kowloon Hong Kong Peoples R China Univ British Columbia Sch Engn Kelowna BC V1V 1V7 Canada Jiangxi Ganyue Expressway Co Ltd Nanchang Peoples R China Power China Jiangxi Elect Power Engn Co Ltd Nanchang Peoples R China

In this paper, four kinds of recycled concrete with 0 %, 0.5 %, 1.0 %, and 1.5 % glass fiber volume ratios were prepared to investigate the alkali corrosion resistance life of glass fiber recycled concrete in an alkaline environment. The alkali solution erosion test, uniaxial compression test, and scanning electron microscope (SEM) test were carried out, respectively. The results show that glass fiber can reduce the mass loss of recycled concrete in an alkaline environment, improve its compressive strength, and prolong its alkali resistance life. When the volume ratio of glass fiber was 1.0 %, the mass loss was reduced by 0.65 %, the compressive strength was increased by 11.22 %, and the alkali corrosion life was prolonged by 40 days, up to 183 days. Based on the grey degree theory GM(1,1), the compressive strength and corrosion resistance coefficient prediction models of glass fiber recycled concrete were established. The accuracy grade of the compressive strength prediction model and the corrosion resistance coefficient prediction model were level 1 (good), indicating that the accuracy of the prediction model was good, which provided a certain theoretical basis for the research in related fields of glass fiber recycled concrete in an alkaline environment.

关键词： Recycled concrete Glass fiber Gray prediction model GM(1,1) Alkaline environment Compressive strength

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