TC4钛合金仿莲房特征芯体热蠕变成形工艺研究

本文提出了一种新的夹层芯体--仿莲房特征芯体结构。以TC4钛合金为对象,采用真空热蠕变成形方法探索了仿莲房特征芯体制备的可行性,并分析了主要工艺参数对仿莲房特征芯体成形高度、显微组织和力学性能的影响。结果表明：采用真空热蠕变成形方法制备仿莲房特征芯体可行,真空热蠕变成形过程中TC4钛合金材料通过发生位错运动和晶界滑移实现芯体孔柱的热成形。真空热蠕变变形后,显微组织由原始细小等轴组织完全转变为再结晶等轴组织。随成形压力和保温时间的增加,芯体高度、平压强度和比平压强度逐渐增加。     

响应面法优化荷叶生物碱盐提取工艺及其纯化

在单因素实验的基础上,通过响应面法分析和优化提取条件,考察超声酸提法中酸的种类、酸的质量分数、超声时间、液固比〔液体体积(m L)与固体质量(g)的比值〕、超声功率和温度对荷叶碱提取效果的影响以及D101型大孔树脂对提取物的纯化效果。得到的荷叶生物碱盐的最佳提取工艺条件为:加热温度60℃、超声功率500 W、盐酸质量分数0.3%、超声时间41 min、液固比27,在该工艺条件下荷叶碱的得率为(4.12±0.05)mg/g。以体积分数为70%的乙醇作为洗脱液,纯化后的生物碱盐经分光光度法测得纯度为40.81%。     

一步式提取净化/超高效液相色谱-串联质谱法测定水生蔬菜中矮壮素和灭蝇胺

目的建立一步式提取净化/超高效液相色谱-串联质谱法(ultra performance liquid chromatographytandem mass spectrometry,UPLC-MS/MS)测定茭白、慈姑和莲藕中矮壮素和灭蝇胺的分析方法。方法样品经乙腈和盐包[2 g NaCl,2 g MgSO_4,1.5 g乙二胺-N-丙基硅烷(primary-secondary amine,PSA)]一步式提取净化,采用UPLC-MS/MS同时进行检测。结果矮壮素和灭蝇胺2种农药在0.0025～0.5 mg/L范围内具有良好的线性关系,且相关系数均大于0.9991。在0.05～0.5 mg/kg范围内,平均添加回收率为65.4%～83.6%,相对标准偏差(relative standard deviation,RSD)在1.1%～3.6%之间。结论该方法操作简单,准确度高,适用于水生蔬菜中矮壮素和灭蝇胺2种农药的同时定量测定。     

Lotus Notes在办公自动化系统中的应用

介绍了Lotus Notes这一以"知识管理"为目标,以"信息交流"为手段的系统,说明了它在办公自动化领域的一些应用.     

Effects of chitosan-based coating and modified atmosphere packaging (MAP) on browning and shelf life of fresh-cut lotus root (Nelumbo nucifera Gaerth)

The present study investigated the effect of chitosan coating containing antibrowning agents and modified atmosphere packaging (MAP) on the browning and shelf life of fresh-cut lotus root stored at 4 °C for 10 days. The atmosphere in the packages was evaluated for O₂ and CO₂ concentrations. The browning on the surface of lotus root slices was prevented by chitosan-based coating and MAP treatment. L* values of coated + MAP and control samples were 68.8 and 48.9 after 8 days storage, respectively. For a^? and b^? values, samples of coated + MAP treatment had the slowest increasing trends among all the treatments. At the end of storage, the coated + MAP samples exhibited the lowest polyphenol oxidase (PPO) activity and malondialdehyde (MDA) content. Its highest overall visual quality (OVQ) scores (> 7) demonstrated that chitosan-based coating + MAP treatment could provide a better inhibitory effect on the browning and extend the shelf life of fresh-cut lotus root.Industrial relevance: Fresh-cut vegetables have drawn the attention of industry as a novel lightly processed product. Both edible coating and MAP treatment cause changes in atmosphere composition and respiration rate of lotus root slices. This combined treatment could be used to control the browning and improve the storage life of this fresh-cut vegetable. This information could be useful for the development of novel application to edible coating and MAP design for lightly processed lotus root.     

防止藕汁褐变工艺的研究

利用生产工艺和化学药物来控制藕汁饮料褐变,如减少蔗塘用量,选用白花莲藕品种、采用榨汁法工艺使汁渣迅速分离、添加柠檬酸等都有明显效果。     

荷叶蜂蜜保健饮料工艺研究

以荷叶、蜂蜜、甘草为主要原料制作保健饮料，通过正交试验对原料取汁及饮料配方进行优选，筛选出荷叶汁、甘草汁提取条件，得到淡黄色的荷叶蜂蜜保健饮料，入口甘甜，回味纯厚，具有独特的荷叶清香风味。     

The in vitro antioxidant activity of lotus germ oil from supercritical fluid carbon dioxide extraction

The in vitro antioxidant activity of lotus germ oil extracted by supercritical fluid extraction (SFE) has been investigated. The distinctly high total phenolic compounds content and tocopherol content in lotus germ oil composition were found to be 9.06 ± 0.11% and 485.1 ± 50 mg/100 g, respectively. The lotus germ oil exhibited a dose-dependent inhibitory effect on the hydroxyl free radical and superoxide anion free radical. However, the scavenging effects on the superoxide anion free radical were deceased when the extract concentration was greater than 70 mg/mL. Lotus germ oil showed substantial antioxidant activity in the mice liver and kidney tissues homogenates in a dose-dependent manner. The auto-haemolysis of mice red blood cells was also blocked by lotus germ oil in a dose-dependent manner. Lotus germ oil showed a higher antioxidant activity in the lard system. The high content of phenolic compounds and tocopherol in the lotus germ oil could partially account for the antioxidant activity. These results suggest the lotus germ oil can be used as healthcare oil to develop.     

Evaluation of the anti-inflammatory efficacy of Lotus corniculatus

The anti-inflammatory effects of the crude extract (CE) of Lotus corniculatus var. São Gabriel and its derived hexane (HEX), ethyl acetate (AcOEt), n-butanol (BuOH) and aqueous (Aq) fractions and isolated compounds kaempferitrin, oleanolic acid and β-sitosterol, in a mouse model of pleurisy induced by carrageenan were investigated. Swiss mice were used in the in vivo experiments. The crude extract of L. corniculatus and its derived fractions, and also its isolated compounds, inhibited leukocytes, exudation, and myeloperoxidase (MPO) and adenosine-deaminase (ADA) activities, as well as nitrite/nitrate concentration and interleukin-1 beta (IL-1β) level (p < 0.05). L. corniculatus showed important anti-inflammatory activity by inhibition not only of leukocytes and/or exudation, but also of pro-inflammatory enzymes and mediators such as MPO, ADA, and IL-1β. The constituent’s kaempferitrin, oleanolic acid and β-sitosterol may well account for it.     

莲花河畔景苑7#楼倒塌后地下车库基坑设计

上海莲花河畔景苑7#住宅楼的倒塌,引起了社会各界的关注。事故发生后,市抢险指挥部和闵行区政府分别指定上海现代设计集团华东建筑设计研究院有限公司和上海建工集团第七建筑有限公司承担后续工程的设计和施工。后续地下车库基坑周边紧邻多幢住宅楼,原车库基坑的围护结构因开挖深度增加和变形控制要求的提高无法利用,成为后续基坑工程实施的障碍物,另外工程工期紧迫,这些因素成为后续基坑工程设计和施工的难点。综合现场环境、工期和施工等条件,最终确定采用型钢水泥土搅拌墙结合一道钢支撑的板式支护结构方案。基坑实施监测表明,采用的支护方案为现场施工的开展和加快工期创造了良好的条件,确保了周边住宅楼的安全,为后续工程的顺利开展创造了良好的条件。