Physicochemical properties of steamed bread fortified with ground linseed (Linum usitatissimum)

Chinese steamed bread (CSB) is a staple food among Asian populations. Linseed (Linum usitatissimum) is an emerging ‘healthy’ food ingredient rich in a range of bioactive components. Ground linseeds were incorporated in northern style CSB formulation up to 20%. Various physico-chemical, nutritional and sensory properties of the resulting CSB were studied. Linseed addition decreased the specific volume and spread ratio of CSB, while increasing the hardness and chewiness in a dose-dependent manner. Linseed addition up to 15% little affected the overall sensory acceptability of CSB. Nutritionally, linseed addition increased the in vitro antioxidant activities of CSB, while decreasing in vitro starch digestibility and expected glycaemic index. It may be concluded that linseed has the potential to enhance the nutritional quality of CSB without negatively affecting the eating quality.     

The influence of brewing method on bioactive compounds residues in spent coffee grounds of different roasting degree and geographical origin

The content of bioactive compounds in spent coffee grounds (SGC) was studied. SGC were obtained from Coffea arabica beans of different roasting degrees (light and dark) and different geographical origins (Nicaragua, Columbia and Mexico) processed using four brewing methods (mocha, filtered, drip and infusion). The highest caffeine and chlorogenic acid contents were determined in filtered spent coffee extracts. All extracts of light roasted spent coffee grounds showed lower browning index levels in comparison to that from dark roasted spent coffee grounds. Generally, the highest content of total polyphenolic compounds and highest antioxidant capacity were determined in extracts prepared in drip. In conclusion, the results obtained in this study indicate that the spent coffee grounds produced of domestic levels, especially those obtained from filter coffeemaker, could be considered as a good source of natural antioxidants.     

麦醇溶蛋白的单宁酸交联及对麦醇溶蛋白/麦谷蛋白共混液流变特性的影响

本研究采用单宁酸对麦醇溶蛋白进行交联,研究蛋白浓度、单宁酸添加量、温度、时间和pH对麦醇溶蛋白交联度的影响,并采用正交实验对单宁酸交联麦醇溶蛋白的工艺进行优化,最终确定交联工艺的最佳条件为:蛋白浓度7%,单宁酸添加量60 mg/g,反应温度为40℃,反应时间为24 h,反应pH为10,此时,麦醇溶蛋白的交联度为(26.59±0.38)%。流变学性质研究表明:单宁酸交联麦醇溶蛋白/麦谷蛋白共混液属于剪切变稀型流体,随着麦醇溶蛋白交联度的增大,共混液的黏度和结构黏度指数减小,非牛顿指数增大,有利于谷朊蛋白纤维和谷朊蛋白膜的制备。     

品牌服装企业顾客满意度测评指标体系

对顾客满意度基本理论进行了阐述,并通过对欧洲顾客满意度指数(ECSI)模型的分析和提炼,构建了适合于本土品牌服装企业的顾客满意度测评指标体系,以此来指导改进传统营销观念,建立以“顾客为导向”的行销战略。根据测评指标体系进行企业实践,通过对具体品牌服装企业在特定范围内的调查,获得数据,再进行分析研究,来综合评价一个品牌服装企业以及顾客对其的满意程度,为品牌服装企业的营销策划工作提供理论指导。     

GMS卫星红外云图数据压缩

依据ＧＭＳ卫星红外气象云图的统计特性,提出了一种“亚抽样＋修改的ＪＰＥＧ＋图象放大”的静止图象编码方法,使有失真压缩比在５０∶１至１００∶１时,恢复图象峰值信噪比在３５ｄＢ～４０ｄＢ之间,主观质量无视觉可觉察到的失真。对于信息保持型ＧＭＳ卫星红外云图数据压缩,选取训练集求取最小均方误差意义下的最佳线性预测器,并作为固定预测器应用于每幅云图,性能优于目前文献报导的固定预测器。     

星载电子设备散热凸台设计与返修方法

针对星载电子设备热设计中导热垫选型困难和散热凸台设计复杂的现状,文中以某星载数据处理器为例提出了一种高效的散热凸台设计及返修方法。通过分析导热垫厚度与接触热阻的关系以及导热垫压缩量与接触压力的关系,确定了导热垫的选型和散热凸台的结构设计方案。通过热仿真分析,证明了该方案在热设计上的合理性。经过导热垫试装及工装检验,验证了设备180余处散热凸台二次返修后安装0.5 mm厚GapPad3000S30型导热垫的匹配性,证明了该散热凸台设计及返修方法的合理性和高效性。该方法在研制热耗较大、散热器件较多的星载电子设备中具有很高的工程实用价值。     

虚拟强度指数优化钻井技术的发展与应用

随着勘探开发的不断深入,新的钻井技术难题不断出现,对钻井速度的要求也越来越高.钻探过程中影响钻井速度的因素很多,尤其是钻井参数的影响最明显,因此合理选用钻井参数非常重要.通过调研不同的钻井参数优化模型,优选出了较为完善的虚拟强度指数(VSI)法.利用相关软件,实时采集转盘转速、扭矩、钻压等钻井参数,计算出VSI曲线,然后根据其变化情况及时调整钻井参数,确保钻头一直处于最佳破岩状态.现场5口井的试验应用表明,该方法能准确判断钻头在井底的工作状况,延长钻头使用寿命,实现提高钻井速度、缩短钻井周期的目标.     

Functional Properties of Chinese Rapeseed Protein Isolates

A membrane-based protein isolation process developed in our laboratory produced two protein isolates from CH₃OH/NH₃/H₂O-hexane-extracted Chinese rapeseed meal. Both contained ～99% protein (NX6.25), and they were essentially free of glucosinolates or their breakdown products (<2,2 μmol/g). Their functional properties were evaluated and compared with a commercial soybean protein isolate. The precipitated isolate gave high values for all properties except nitrogen solubility index (NSI) while the soluble isolate showed excellent NSI and fat absorption but poor emulsification characteristics. They both had good foaming properties. The two Chinese rapeseed protein isolates complemented each other and were comparable to soybean protein isolate in most functions.     

高低Mi值聚丙烯共混纺丝

本文采用高低Ｍｉ值聚丙烯共混纺丝。生产结果表明，可以降低低Ｍｉ值聚丙烯纺丝温度，改善其可纺性及纤维性能。     

结构光检测点云精简与重构参数自动调节方法

针对薄壁叶片的点云扫描采样会产生特征消失、三角重构会产生孔洞现象的问题,提出一种改进的点云精简以及重构的方法。首先,根据法向量夹角阈值和欧氏距离提取叶片外轮廓;其次,计算点云的平均曲率和高斯曲率,设定阈值对点云划分子集,采用索引空间法对点云数据进行精简;然后,采用贪婪算法针对距离阈值系数和三角形参数对叶片点云进行实验分析,得出没有孔洞的贪婪三角参数经验值;最后对距离阈值系数和点云平均间距拟合出关系式,实现贪婪重构的参数自动调节。实验结果表明,在总体精简率为90%左右时,相较于另外两种方法,标准偏差分别下降了26.45%和19.92%,外轮廓尺寸平均偏差分别下降了79.81%和47.97%。按照提出的方法设置重构参数,重构质量良好,对薄壁叶片实现在机智能加工检测具有良好的应用参考。