节能家电电源整体解决方案

家电是节能推行过程中重要的一部分。在本文中,推荐了家电电源的整体解决方案。通过融合最先进的技术,能够设计出顶尖的开关电源,这引起了系统设计者极大的兴趣。本文描述每款产品的功能特点和优点,并列出评估板的测试结果。     

不同方法制备La2O2CO3/ZnO催化乙醇转化的研究:孔结构和表面碱性的影响

利用共沉淀法和乙二醇燃烧法制备La₂O₂CO₃/ZnO两种催化剂，评价其对生物乙醇脱氢生成乙醛的催化活性，并采用FE?SEM, HR?TEM, FT?IR, XRD, BET，CO₂?TPD等研究手段对催化剂的形貌及表面碱性等物相结构进行表征. 结果表明，制备方法对催化剂形貌以及性能影响十分明显，乙二醇燃烧法形成的大孔结构有助于乙醇的转化，同时产物乙醛的选择性与催化剂表面碱性有关.     

USE OF A CONTROLLED CHLORINE DIOXIDE (CLO2) RELEASE SYSTEM IN COMBINATION WITH MODIFIED ATMOSPHERE PACKAGING (MAP) TO CONTROL THE GROWTH OF PATHOGENS

ABSTRACT

Salmonella Typhimurium and Listeria monocytogenes are major bacterial pathogens associated with poultry products. A controlled released ClO₂ sachet applied with modified atmosphere packaging (MAP) was evaluated for its ability to control the growth of S. Typhimurium and L. monocytogenes on raw chicken breast during refrigerated storage. The fresh chicken samples were inoculated with one or the other of the pathogens at 10⁴ cfu/g, and the packages (with and without ClO₂ sachet) were flushed with ambient air or 30% CO₂/70% N₂ before sealing, and then stored at 4C for up to 21 days. The maximum reduction in MAP plus ClO₂ (compared with MAP alone) was 0.68 log cfu/g for S. Typhimurium and 1.87 log cfu/g for L. monocytogenes. Color and pH changes of the chicken breast were observed at 8 µg/h of ClO₂ during the storage period.

PRACTICAL APPLICATIONS

We think that the results of the study with the combined treatment of chlorine dioxide (ClO₂) and modified atmosphere packaging may enhance the effectiveness of antimicrobials, reduce the amount of agent needed, and decrease the risk of off‐flavors. The applications of the results will be useful for poultry industry to give the significant improvement in shelf life for packaged fresh products.     

三维重建图像在水平视差大深度积分成相的放大

在这篇论文中,一个能放大三维重建图像的水平视差积分成像被提出.自从水平视差积分成像为我们提供一个三维的自然图像列,三维图像放大的实现是通过观察重建图像在水平自然图像列和垂直图像差行技术的合成使用.为了显示被提出积分系统的可能性,做了一些关于三维图像放大的实验,实验结果被提出.     

Optimal rotor wear design in hypotrochoidal gear pump using genetic algorithm

The wear rate between the rotors of a hypotrochoidal gear pump is characterized.Using the knowledge of shape design on the rotors,the contact stresses without hydrodynamic effect between the rotor teeth were evaluated through the calculation of the Hertzian contact stress.Based on the above results and the sliding velocity between the rotors,a genetic algorithm (GA) was used as an optimization technique forminimizing the wear rate proportional factor (WRPF).The result shows that the wear rate or the WRPF ca...     

An AIoT Monitoring System for Multi-Object Tracking and Alerting

Pig farmers want to have an effective solution for automatically detecting and tracking multiple pigs and alerting their conditions in order to recognize disease risk factors quickly. In this paper, therefore, we propose a novel monitoring system using an Artificial Intelligence of Things (AIoT) technique combining artificial intelligence and Internet of Things (IoT). The proposed system consists of AIoT edge devices and a central monitoring server. First, an AIoT edge device extracts video frame images from a CCTV camera installed in a pig pen by a frame extraction method, detects multiple pigs in the images by a faster region-based convolutional neural network (RCNN) model, and tracks them by an object center-point tracking algorithm (OCTA) based on bounding box regression outputs of the faster RCNN. Finally, it sends multi-pig tracking images to the central monitoring server, which alerts them to pig farmers through a social networking service (SNS) agent in cooperation with an oneM2M-compliant IoT alerting method. Experimental results showed that the multi-pig tracking method achieved the multi-object tracking accuracy performance of about 77%. In addition, we verified alerting operation by confirming the images received in the SNS smartphone application.     

聚乙烯管道电熔焊接接头的超声检测

聚乙烯管连接中大量使用电熔接头,其质量的好坏直接影响管道系统的安全。分析了超声聚焦检测技术对聚乙烯管电熔接头各类缺陷的检出能力。在此基础上,运用相控阵超声技术及B扫描实时成像超声方法检测大量含缺陷接头,对比超声成像图与接头实剖图,发现该方法有较高的检测灵敏度和检出精度,可以应用于工程实践。