化学催化制备富含共轭亚油酸的改性磷脂

在无溶剂体系中,使大豆卵磷脂与共轭亚油酸乙酯发生酯交换反应,以制备富含共轭亚油酸(CLA)的改性磷脂。研究了催化剂种类、催化剂用量(基于磷脂的质量)、反应时间、反应温度、物料比(大豆卵磷脂与共轭亚油酸乙酯的质量比)对改性磷脂制备的影响,并通过气相色谱对改性磷脂的脂肪酸组成进行定量分析。结果得出优化的制备条件为:甲醇钠(30%甲醇溶液)为催化剂,催化剂用量2.0%,反应时间8 h,反应温度130℃,物料比1:5。在此条件下,产物改性磷脂中CLA含量可达29.18%。     

先做人,后创业;宁亏本,不亏心--大连瑞安八珍食品有限公司发展纪实

<正>八珍品牌有口皆碑在大连,随便问一下市民,买熟肉制品谁家的产品好,什么品牌?大多数人会告诉你,买瑞安八珍的“知了”牌。从几个人作坊式经营的小厂,发展到今天员工数百,在大连同类企业中处于前列,规模大、信誉高的肉禽熟食生产企业,大连瑞安八珍食品有限公司整整用了十年的时间。     

高压蒸汽过热盘管变形原因分析及对策

介绍甲醇装置高压蒸汽过热盘管变形的具体情况,分析高压蒸汽过热盘管变形的原因,并提出相应的对策。     

龙眼菠萝复合果酒褐变抑制的研究

研究了龙眼菠萝复合果酒加工过程中原料配比、原料成熟度、抑制剂处理、杀菌条件对果酒褐变的抑制效果.结果表明:龙眼的配比越大、成熟度越大,果酒的褐变程度越大;杀菌温度90℃、杀菌时间20min、柠檬酸添加量0.3％时,对果酒有较好的褐变抑制效果,但抗坏血酸、半胱氨酸、CaCl2对该果酒的褐变抑制效果较差,不适宜用作龙眼菠萝复合果酒的褐变抑制剂.     

Skin colour assessment in safety testing of cosmetics. An overview

Synopsis
Few subjects are as problematical to dermatologists, cosmetologists and related experimenters involved in safety testing as the clinical assessment of skin colour. At the core of the problem is the word erythema, which does not communicate a sense for the nuance of red. In addition, light shades of red are not visible in dark-skinned people. Human assays aiming at evaluating the irritancy and allergic potential of cosmetics take advantage to use instrumental assessments of skin colour. However, there are pitfalls related to the complex biological aspects of the cutaneous reactivity, to the design of the in vivo assay, and to technical aspects bound to the principle of the measuring methods. Sound information can only be reached when these concerns are solved.
Résumé
Peu de sujets sont aussi problématiques pour les dermatologues, cosmétologues et autres expérimentateurs impliqués dans les tests de sûreté que l'évaluation clinique des couleurs cutanées. Au centre du problème est le mot érythème qui ne communique pas la notion des nuances de rouge. De plus, un érythème discret peut ne pas être visible chez des individus à la peau foncée. Les tests humains visant àévaluer les potentialités d'irritation et d'allergie aux cosmétiques bénéficient des évaluations instrumentales de la couleur cutanée. Cependant, il existe des pièges liés aux aspects biologiques complexes de la réactivité cutanée, au choix du test in vivo et à des aspects techniques en relation avec le principe du système de mesure. Une information adéquate ne peut être obtenue qu'après avoir résolu ces problèmes.     

高浓打浆过程的数学模型

根据比边缘负荷理论,建立了福建青州造纸厂高浓打浆过程的数学模型,并证实了模型的正确性。模型为实现高浓打浆过程的自动化控制提供了理论依据：     

磷脂酶A1酶法脱胶精炼油稳定性研究

通过改变酶法脱胶工艺条件,寻找一种提高磷脂酶A1(PLA1)酶法脱胶精炼油稳定性的方法.分别考察了水洗、柠檬酸的添加及脱色剂对酶法脱胶精炼油稳定性的影响.结果显示,水洗、添加柠檬酸在一定程度上能改善PLA1酶法脱胶精炼油的稳定性,但效果不及在脱色过程中添加活性炭明显.在脱色过程中添加0.1％的活性炭可以有效改善PLA1酶法脱胶精炼油的稳定性,达到可以和化学精炼油相似的效果.     

提高晶闸管di/dt能力的研究

从di/dt损坏机制、定量公式入手,分析了国内外有关di/dt的著作、文章,研究了提高晶闸管器件di/dt能力的各种有效方法,给出了一个常规新设计及其研究成果。     

Application of infrared thermography and extension recognize method to intelligent fault diagnosis of distribution panels

Distribution panels are an important piece of equipment in power systems. Maintaining a loading panel and ensuring security are not easy because the power supply cannot be interrupted in high‐tech factories. Distribution panels need fully functional condition monitoring and fault diagnosis systems to prevent accidents and reduce maintenance costs. In this paper, a new scheme is proposed to design an auto‐diagnosis tool for electrical distribution panels using infrared thermography to build diagnostic features using the matter‐element model. The paper then presents an extension recognize method (ERM) based on extension theory to diagnose the abnormality element by using degrees of correlation between the tested pattern and the matter‐element models that have been built up. Test results show that the proposed method can not only recognize the main defect element of the tested panel but also detect useful information for future trends and multi‐defect analysis by the correlation indexes. This new approach merits more attention as a tool to be used in the defect recognition problems of distribution panels, especially in high‐tech factories in Taiwan. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Solubility and diffusivity of CO<Subscript>2</Subscript> in <Emphasis Type="Italic">n</Emphasis>-butanol + N235 system and absorption mechanism of CO<Subscript>2</Subscript> in a coupled reaction-extraction process

The absorption of CO₂ in insoluble organic amine is crucial for understanding the mechanism of coupled reaction-extraction-crystallization process between aqueous chloride and CO₂. In this study, the solubility and diffusivity of CO₂ in n-butanol + N235 system were measured and reported. The absorption of CO₂ in the system is a physical absorption behavior and the solubility of CO₂ decreases with the increase of the mass fraction of N235. The diffusivity of CO₂ increases firstly and then decreases with the increase in the mass fraction of N235. Moreover, the absorption mechanism of CO₂ in the coupled reaction-extraction-crystallization process was investigated and identified by experiments. The results indicated that in the coupled reaction-extraction-crystallization process, CO₂ is absorbed by the aqueous phase rather than by the organic phase and further transferred into the aqueous phase.

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