新加坡食品较健康选择标志系统经验启示

文章介绍了新加坡较健康选择标志系统基本情况,从规格与使用要求、申请程序、适用范围等进行阐述,指出新加坡作为第一个实施食品FOP标签系统的亚洲国家,其经验做法对中国乃至多数亚洲国家有重要借鉴意义,中国FOP标签系统应具有充分的依据,严格规范申请和使用行为并适度扩大应用范围。     

Digital twin-based assembly data management and process traceability for complex products

Complex products such as satellites, missiles, and aircraft typically have demanding requirements for dynamic data management and process traceability. The assembly process for these complex products involves high complexity, strong dynamics, many uncertainties, and frequent rework and repair, especially in the model development stage. Achieving assembly data management and process traceability for complex products has always been a challenge. A recently proposed solution involves one-to-one mapping of the corresponding physical entity, also known as the digital twin method. This paper proposes a digital twin-based assembly data management and process traceability approach for complex products. First, the dynamic evolutionary process of complex product assembly data was analyzed from three dimensions: granularity, period and version. Then, a framework of digital twin-based assembly data management and process traceability for complex products was constructed. Some core techniques are: 1) workflow-based product assembly data organization and version management; 2) synchronous modeling of the product assembly process based on digital twin; and 3) hierarchical management and traceability of product assembly data based on digital twin. On this basis, an algorithm flowchart for generating a product assembly data package was created, which includes product assembly data management, assembly process traceability, and generation of a product assembly data package. Furthermore, the Digital Twin-based Assembly Process Management and Control System (DT-APMCS) was designed to verify the efficiency of the proposed approach. Some aerospace-related assembly enterprises are currently using DT-APMCS and achieving satisfactory results. Finally, a summary of our work is given, and the future research work is also discussed.     

Effect of pre-harvest and post-harvest conditions on the fruit allergenicity: A review

Fruits are an important source of vitamins and antioxidants that can effectively delay aging and contribute to health and well-being of the human kind. However, they are growing to be one of the primary elicitors of food allergies around the world. Fruit allergens can induce an IgE-mediated (Immunoglobulin E) reaction, presenting with a symptom like localized oral allergy syndrome (OAS). Numerous studies showed that varying environmental and cultivation conditions can influence the fruit allergen content during flowering and ripening stages. Further, the variety, harvesting maturity, and storage conditions can also significantly influence the allergenicity potential. For example, unripe apples and tomatoes have lower levels of allergens compared to ripened fruits. Researchers have also reported that modified atmosphere packaging (MAP) can help reduce Mal d 3 content present in apples during storage. Post-harvest processing like peeling is also considered a good method to help reduce the overall allergenicity in few fruits whose peel might contain majority of the allergens. This review will discuss the overall influence of both pre-harvest and post-harvest factors on the fruit allergens. We will also discuss the progress regarding the cause, symptoms and diagnostic methods of fruit based allergies.     

香肠整体营养价值评价与包装正面标签应用研究进展

为促进我国消费者对香肠的合理消费与饮食健康，引导企业生产营养健康的香肠，利用《中国食物成分表》（第1册第2版）的16 种香肠及其营养素数据，构建富含营养素食物（nutrient-rich foods，NRF9.3）模型，评价香肠整体营养价值，并借鉴瑞典的锁孔（Keyhole）标识和英国的多交通灯信号标签进行相应的包装正面（front of package，FOP）标签应用探索。结果表明：除了儿童肠、火腿肠外，14 种香肠的NRF9.3＜0，每100 kcal的推荐性营养素含量均低于限制性营养素，对人体的营养价值较低，适合采用总结指示体系和特定营养素体系的FOP标签进行标示；因此，居民日常应限制香肠摄入，建议对脂肪、盐含量超标的香肠采用红色交通灯信号标签提醒消费者，对NRF9.3＞0的香肠实施单一的健康选择标识推荐消费者选购。     

环锭纱络筒质量的检测与控制

为探讨环锭纱络筒过程中纱线质量的影响因素,通过设置对比实验的方法测试络筒纱线的毛羽数、条干不匀率、强伸性和卷绕点分布,得到同一纱筒上不同半径纱层的纱线质量数据,并进行研究分析。结果表明:中层筒子纱线的毛羽较少,对应的纱线比较光滑,CV值较低,条干均匀度高;最内层和最外层纱线的强力最大;最外层纱线重叠率最低。生产中可以采取改进络筒工艺参数、选择适宜的槽筒材质等措施,提高卷绕质量及络筒质量。     

基于改进卷积神经网络的化纤丝饼表面缺陷识别

针对传统人工检测化纤丝饼表面缺陷方法的不足,提出改进的卷积神经网络对正常以及3种常见缺陷丝饼进行分类识别。首先对采集的丝饼图像进行分块处理,然后利用改进的卷积神经网络进行特征提取,采用全局最大池化层代替全连接层,增强了图像对空间变换的鲁棒性,减少了模型参数,并利用softmax分类器进行分类。最后在网络学习过程中提出主动学习方法,用少量标注样本对网络进行训练,选出对提升网络性能最具价值的样本进行标注并加入到训练样本中进行训练检测。结果表明,该方法可有效实现丝饼的缺陷识别,识别准确率达到97.1%,并有效减少了网络所需的标注样本数量,节省大量的标注成本,具有一定的通用性。     

三软煤层中选取采煤机主参数注意的问题

介绍三软煤层的特点及采煤机在三软煤层中的使用工况 ,提出了采煤机在三软煤层配套及使用中的注意事项 ,为三软煤层综采配套采煤机的选型提供了理论分析和参考意见。     

岩土工程数字照相量测软件系统研发与应用

为便于数字照相变形量测(DPDM)技术在岩土工程中的应用与推广,研究开发一套完整的数字图像分析与结果可视化后处理软件包。首先,根据观测目标上是否使用人工量测标志点,将DPDM分为两大类:标点法和无标点法,针对岩土类材料局部化变形特性,提出旋转加平动的图像相关分析三步搜索算法;然后说明基于等参四边形单元的坐标转换与变形解释方法,并介绍DPDM软件包的主要功能,讨论图像采集、量测精度、适用范围等应用关键问题。软件系统可为砂土、黏土、钢筋混凝土、岩石等岩土工程常用材料的数字照相变形全程观测、演化过程以及局部化分析提供有力支持。最后,给出一个应用实例——侧向受荷桩模型试验。     

基于高斯分段烟羽模型的海上核素弥散模型

根据海上核事故核素弥散特点,选择高斯模型进行模拟,基于高斯分段烟羽模型对事故发生后较短时间内的核素弥散情况进行了模拟分析,通过Matlab编程模拟烟羽扩散形式,得出了短时间内事故舰船周围的核素分布情况,从而对受时间和风场影响的核素弥散过程实现了实时烟羽动态模拟。整个核素弥散过程可预报一定时间内核素弥散路径和影响范围,为核救援方案提供参考。