Comparative analysis of the fatty acid and sterol profiles of widely consumed Mediterranean crustacean species

Comparative analysis of FA, NL and sterol profiles in the Nephropsnorvegicus (langoustine), Palinurusvulgaris (lobster) and Penaeuskerathurus (shrimp) muscle and cephalothorax showed that C16:0, C16:1ω-7, C18:0, C18:1ω-9, C20:4ω-6, EPA and DHA were found to be their major FA. Highest EPA occurred in langoustine muscle TL, DHA in both shrimp tissues TL while C20:4ω-6 in lobster muscle and cephalothorax TL. Muscle and cephalothorax NL consisted mainly of sterols (42.5–54.4% and 13.7–43.1%) and triacylglycerols (35.4–45.8% and 44.6–59.4%). Cholesterol was the major sterol (70.90–98.58% and 97.10–98.31% of total sterols in muscle and cephalothorax respectively) followed by avenasterol (0.18–20.32% and 0.07–0.70%) and β-sitosterol (0.29–7.30% and 0.23–0.75%). Lower concentrations of brassicasterol, stigmasterol, Δ7-stigmasterol, campesterol and campestanol were also found. The examined crustaceans muscle (edible part) was found to be a good ω-3 PUFA source for the consumers, while the cephalothorax (which is usually discarded) could be used effectively as a source for ω-3 PUFA production.     

婴幼儿配方奶粉强化DHA和AA的研究

近年来的研究表明DHA和AA对婴幼儿大脑和视力的正常发育有着重要的生理作用，在婴幼儿，特别是早产儿以及人工喂养的婴幼儿配方食品中添加DHA和AA十分必要。目前，婴幼儿配方奶粉强化DHA和AA已越来越受到世界各国的重视，许多国家已批准强化DHA和AA婴幼儿配方奶粉市场销售。不过，生产和摄取DHA和AA婴幼儿配方奶粉，需要考虑DHA和AA平衡以及摄取量，同时还应注意防止二者的氧化，以确保婴幼儿安全、有效地利用DHA和AA。     

PMI中AA与ARA通信模型设计及形式化描述

授权管理基础设施（PMI）系统中属性权威（AA）与属性注册权威（ARA）通信状态多且变化复杂。提出了一个PMI中AA与ARA的通信模型，以避免不安全的中间状态出现。对该模型的特征进行了分析，运用有限状态机(FSM)对该模型进行形式化描述，并证明了其安全性。     

Microstructure and microtexture evolution of aluminum alloy 3003 under ultrasonic welding process for embedding SiC fibre

Ultrasonic welding process can be used for bonding metal foils which is the fundament of ultrasonic consolidation (UC).UC process can be used to embed reinforcement fibres such as SiC fibres within an aluminum matrix materials.In this research we are investigating the phenomena occurring in the microstructure of the parts during ultrasonic welding process to obtain better understanding about how and why the process works.High-resolution electron backscatter diffraction (EBSD) is used to study the effects of the vibration on the evolution of microstructure in AA3003.The inverse pole figures (IPF) and the correlated misorientation angle distribution of the mentioned samples are obtained.The characteristics of the crystallographic orientation,the grain structure and the grain boundary are analyzed to find the effect of ultrasonic vibration on the microstructure and microtexture of the bond.The ultrasonic vibration will lead to exceptional refinement of grains to a micron level along the bond area and affect the crystallographic orientation.Ultrasonic vibration results in a very weak texture.Plastic flow occurs in the grain after welding process and there is additional plastic flow around the fibre which leads to the fibre embedding.     

Effect of heat treatments on the tensile strength and SCC-resistance of AA7050 in an alkaline saline solution

Effect of heat treatments (namely T6, T73, RRA, OP1 and OP2) on the tensile strength (TS) and stress corrosion cracking (SCC) resistance of aluminum alloy 7050 in 3.5% NaCl solution at pH 12 has been investigated using constant extension rate tester (CERT). T6 increases the TS but decreases the SCC-resistance. To the opposite, T73 (i.e., T6 + 160 °C/30 h) increases the SCC-resistance but decreases the TS. Retrogression and re-aging (RRA, i.e., T6 + 200 °C/10 min + water quench + 120 °C/24 h) increases both TS and SCC-resistance but this treatment confines only to thin and small specimens. Step-quench aging (SQA, i.e., 470 °C/1 h + step-quench to 200 °C/1 min + water quench/or air cooling + natural aging at room temperature/1 week + 120 °C/24 h) provides a relatively practical treatment to enhance both the TS and SCC-resistance even the specimen either having quenched in water (OP1) or cooled in the air (OP2) in the process. Through electrochemical testing and micro-structural examination, we found that both the TS and SCC-resistance of AA7050 is governed by the microstructures that depend on heat treatments.     

复配生物硅藻精土AA/O工艺处理综合性工业废水

介绍了采用复配生物硅藻精土AA/O工艺处理综合性工业废水的工艺流程。通过以复配生物硅藻精土作为微生物的载体的连续流中试实验,考察水力停留时间对复配生物硅藻精土AA/O工艺处理综合性工业废水的效果。简介了试验过程,经试验结果分析可知,水力停留时间的长短对CODcr、SS、色度去除效果影响不大;对BOD5、NH4-N、TP去除效果影响较大,停留时间越长,去除效果相对较好。该工艺在水质复杂的工业废水处理中有良好的应用前景。     

Modeling of isothermal recovery and recrystallization kinetics by means of hardness measurements

Recovery and recrystallization, which may happen during annealing of materials, are very important technological processes through which many properties of the material can be changed. Hence, reliable and efficient modeling of the softening process is vital. Hardness can be used as a simple and cheap measure to model the softening processes. In the present study, the isothermal recovery and recrystallization kinetics of a commercial purity aluminum alloy AA1050 is experimentally modeled using hardness test at four temperatures from 285 °C to 400 °C after cold rolling to various reductions. In order to achieve more accurate analysis, hardness data points are increased and a statistical method is used. The isothermal recovery and recrystallization kinetics are described by a logarithmic and the Johnson‐Mehl‐Avrami‐Kolmagorov relationships, respectively. It is found that hardness measurements can be performed as a parameter to quantify recovery and recrystallization kinetics. The constants of models and the activation energies for both processes are calculated in the different conditions. These constant parameters are dependent to the temperature. Also, the activation energies of recovery and recrystallization rise as these transformations proceed.     

A Hospice for Parametricism

Could Parametricism 2.0 prove the final resting place for Parametricism1.0? Architect and Assistant Dean of the Yale School of Architecture, Mark Foster Gage questions the underlying currency and influence of Parametricism, condemning it as a ‘true red herring’ of a style.