Effect of microwaves on rice quality

The effect of microwave radiation on rice quality was investigated using an industrial continuous microwave oven. Effects of microwave treatment, packaging method and storage time on rice quality during storage were assessed. Water content, free fatty acid content and protein content were reduced but the blue value (BV) of rice and the sensory quality of cooked rice increased as microwave-energy consumption increased. Qualities of both microwave-treated and untreated rice changed during storage, but the changes were less in the treated rice sample. Differences in the protein content, fat content and total sugar content between the microwave-treated and untreated rice were significant at the beginning of storage but not after storage for more than 120 days. Variance analysis showed that rice storage qualities were significantly affected by treatment methods and storage time while packaging methods had no significant effect on any of the qualities.     

Evaluation of sampling units and sampling plans for adults of Cryptolestes ferrugineus (Coleoptea: Laemophloeidae) in stored wheat under different temperatures, moisture contents, and adult densities

Development and evaluation of optimum size and number of sample units is required for cost-effective management of stored grain beetles. In this study, we evaluated the sampling parameters and accuracy of insect density detection and estimation, developed the optimum size and number of sample units, and conducted a feasibility study of the insect detection and density estimation. The measured insect densities in 92% of random samples were less than the introduced insect densities and 67.4 ± 10.8% of random samples did not contain adults when the introduced insect density was 0.1 A/kg (adult/kg). If the random sampling technique was used and 15% of the stored wheat bulk was sampled, 72% of determined means of insect densities of the sampling sets were lower than the introduced insect densities. Increasing the size of sample units did not improve the accuracy of the estimation of insect densities; however, it did considerably increase the probability of insect detection when insect densities were lower than 1.0 A/kg. We recommend at least 7 kg per sample unit for insect detection (especially when insect densities < 0.1 A/kg) and the optimum number of sample units with 15 kg grain per unit should be >24 for a fixed precision of 0.35 when insect densities < 0.1 A/kg. This might be a challenge for grain storage practice. Therefore, using sampling technique to estimate insect densities and detect insects at low insect densities (<0.1 A/kg) might not be practicable.     

Ginsenosides and phenolics in fresh and processed Korean ginseng (Panax ginseng C.A. Meyer): Effects of cultivation location,year, and storage period

This study reports the effects of cultivation location, cultivation year, and storage period on 13 ginsenosides and 30 phenolics in Korean fresh ginseng (FG) and its three processed ginsengs (white ginseng, WG; taeguek ginseng, TG; red ginseng, RG). Total ginsenosides content in FG was affected by cultivation year (P = 0.038) and storage period (P = 0.0021), not by cultivation location. In contrast, phenolics content in FG was affected by cultivation locations (P < 0.0001) and cultivation year (P = 0.0083), but not by storage period. Processed ginsengs, especially RG, contained larger amounts of ginsenosides and phenolics than those in FG. Thus, RG could be considered as the best ginseng type for human health benefits. The present study extended our knowledge about the change of ginsenosides and phenolics in ginsengs with respect to cultivation location, cultivation year, and the storage period.     

基于Moldflow分析的汽车储物箱注塑模设计

以汽车储物箱为实例,借助模流分析软件Moldflow对其浇口位置、充模时间、注射压力、气穴和熔接痕等进行模拟分析,根据分析结果有针对性地优化模具设计方案。并将分析结果用于实际生产中,取得了较好的效果。     

表面改性对贮氢合金电极性能的影响

本文用化学处理和化学镀镍对金属氢化物的表面改性处理,初步讨论和分析了这些处理对金属氢化物电极的活化和容量等性能的影响。其结果表明:表面改性后的贮氢电极放电容量提高,放电特性增强。     

蓄电池用胶体电解质

本文概述了胶体电解质的现状、形成、制备方法等。讨论了胶体电解质的特性,对胶体蓄电池与常规硫酸液蓄电池进行了比较,分析了胶体蓄电池性能差的原因,对胶体电解质的改进提出了相应的措施。     

视频网站的数据存储管理优化

针对视频网站数据优化存储的问题,定义了文件热度的概念,利用平均值的方法描述了各个类型数据的热度。在此基础之上采用时间序列方法对数据进行预测,得到了未来十天的不同类型视频的访问情况。最后,分析了文件多个周期的热度,通过隶属度函数确定出每一个周期的淘汰阈值,通过计算不同周期的淘汰阈值,得到一个动态的淘汰阈值示意图,从而给出文件淘汰分发的原则,实现了数据的存储管理优化。     

R6氯化镁电池

R6氯化镁电池的电解液是由氯化锌改用氯化镁,因之电解性能更为优异,特别是对照像闪光次数大为升高,贮存性能更加延长。     

日本稀土贮氢电池现状和发展趋势

本文论述了日本稀土贮氢电池的生产现状、市场分析和发展趋势。     

Pyropheophytin a and 1,2-Diacyl-glycerols Over Time Under Different Storage Conditions in Natural Olive Oils

The effect of storage conditions (light, temperature, container types) and time on the quality of natural olive oils from different cultivars and Australian regions were studied. The oils’ changing quality was monitored through several physico-chemical methods (free fatty acids, peroxide value, UV-spectrometry (K₂₃₂, K ₂₇₀ and ΔK), induction time, total polyphenol content, bitterness, pyropheophytin a and 1,2-diacyl-glycerol content) and sensory analysis over 24 months. Pyropheophytins a and 1,2-diacyl-glycerols criteria showed very good performance as indicators of overall olive oil quality and freshness as well as highlighting any problems during the storage of the product. Pyropheophytin a increment averaged 7 % per year and the 1,2-diacyl-glycerols decreased at an average of 23 % per year at normal storage conditions over time.