两种工艺拐枣酒抗氧化成分及活性比较

以拐枣果梗为原料,制备拐枣露酒与发酵酒,测定拐枣酒中营养成分含量,并采用氧自由基吸收能力（ORAC）、铁离子还原能力（FRAP）、2,2'-联氨-双（3-乙基苯并噻唑啉-6-磺酸）二铵盐（ABTS）与1,1-二苯基-2-苦肼基（DPPH）自由基清除能力4种方法对其抗氧化活性进行测定,旨在比较两种工艺拐枣酒抗氧化成分含量及抗氧化活性。结果表明,拐枣发酵酒中总多酚、总黄酮、抗坏血酸含量均高于拐枣露酒,拐枣露酒中具有较高的糖含量,发酵酒中残糖量少。两种工艺拐枣酒均具有很强的抗氧化能力,其抗氧化能力与之含有的总黄酮、总多酚及抗坏血酸含量呈显著正相关（P＜0.05）。拐枣酒的ORAC值在6.49～14.69 mmol/L之间,FRAP值在3.59～11.71 mmol/L之间,对ABTS、DPPH自由基的清除率均＞90%,半抑制浓度（IC50）值分别在7.10～20.30 μg/mL、23.40～52.30 μg/mL之间。拐枣露酒与拐枣发酵酒相比,发酵酒中营养成分含量更高,品质更佳,抗氧化能力更强。     

试论复配添加剂充当非法添加物载体的风险

以近年来发生的苏丹红染料和邻苯二甲酸酯类增塑剂污染食品为例, 说明了复配食品添加剂充当非法添加物载体的风险;分析了复配食品添加剂潜伏风险因素的成因;讨论了非法添加物通过复配食品添加剂携带污染食品的特点;从复配添加剂生产、食品生产中复合食品添加剂使用与以及对上述两者的监管等方面提出了风险管理与应对的措施。     

基于全流程优化的锅炉机组混煤掺烧决策模型

针对目前火电厂在优化混煤掺烧配比时,采用局部优化存在燃烧不稳定且难以实现电厂全流程经济性最优等问题,提出一种构建基于全流程优化的锅炉机组混煤掺烧优化决策模型对混煤掺烧技术的配煤方案进行优化的方法．首先构建出锅炉燃烧输入总热量(采购燃煤总低位发热量)的数学模型,据此来拟定初步的混煤采购方案;然后利用基于实验数据的统计方法与基于基本原理的理论建模相结合的方法,建立锅炉混煤掺烧全流程各子系统和设备运行及维护成本模型;最后构建以锅炉机组混煤掺烧运行时,全流程各子系统和设备单位运行及维护成本总和最低作为优化决策数学模型,并提出采用遗传算法对其进行寻优求解．将该决策模型应用于某330 MW锅炉机组中进行验证,由优化后的结果可知,优化掺烧配比后不同负荷下的锅炉机组供电单位成本均有所降低．构建得到全流程优化决策模型为锅炉机组实际混煤掺烧配煤方案优化提供了定量化的理论指导．     

基于师范生教学实践能力培养的混合式教学模式研究——以河北科技师范学院小学教育专业为例

为提升师范院校实践教学质量,就师范生教学实践能力培养进行混合式教学模式研究,提出通过线上教学与线下教育实践相融合的培养模式。借助线上观摩优秀教学视频、线下观摩实地教学的教育见习模式,基于翻转课堂的教育研习实习模式,远程微格研训与毕业实习相融合的模式,以期发挥线上和线下各自的优势形成合力,建构和提升师范生教学实践能力。该模式遵循师范生教学能力发展规律,采用线上和线下相结合方式,创新培养模式,发挥线上与线下教学各自优势,实现培养目标。     

预取向丝-拉伸加捻丝混纤复合的品质管控

对涤纶预取向丝(POY)-拉伸加捻丝(DT)混纤复合生产过程中常见的抱合不好、染色降等、多股/少股漏检问题进行了分析,给出了解决这些问题的经验办法,对改善混纤复合丝产品品质有一定的参考价值。     

涤棉卡其耐久阻燃整理研究

本文介绍了涤棉混纺织物阻燃特点及国外发展概况,进一步探讨了用 Br—Sb 复合阻燃体系对65/35涤棉卡其进行耐久阻燃整理,得到了手感良好,阻燃性能优良的耐久阻燃整理织物。     

Learning through inquiry: student difficulties with online course-based Material

Abstract This study investigates the case-based learning experience of 133 undergraduate veterinarian science students. Using qualitative methodologies from relational Student Learning Research, variation in the quality of the learning experience was identified, ranging from coherent, deep, quality experiences of the cases, to experiences that separated significant aspects, such as the online case histories, laboratory test results, and annotated images emphasizing symptoms, from the meaning of the experience. A key outcome of this study was that a significant percentage of the students surveyed adopted a poor approach to learning with online resources in a blended experience even when their overall learning experience was related to cohesive conceptions of veterinary science, and that the difference was even more marked for less successful students. The outcomes from the study suggest that many students are unsure of how to approach the use of online resources in ways that are likely to maximise benefits for learning in blended experiences, and that the benefits from case-based learning such as authenticity and active learning can be threatened if issues closely associated with qualitative variation arising from incoherence in the experience are not addressed.     

OLES: an instrument for refining the design of e-learning environments

Abstract Designing and implementing effective e-learning is a complex process, which involves many factors. Lecturers need to constantly consider, evaluate and adjust these factors to provide effective e-learning environments for students. In this paper, we report on the design and development of the Online Learning Environment Survey (OLES), an instrument which can be used to gather and represent data on students' 'actual' (experienced) and 'preferred' (ideal) learning environments. We describe the use of this instrument in blended learning environments with university classes, illustrating how OLES can be used by educators striving for good practice in the design of effective online learning environments.     

山东动力用煤掺混燃烧特性的热分析

利用热分析法对山东动力用煤及其混煤的着火、稳燃、燃尽性能进行了试验研究．结果表明：组分煤种的燃烧性能相近时，混煤的燃烧特性随掺烧比的变化呈现出较好的规律性；燃烧性能相差较大的煤种所组成混煤的燃烧特性与组分煤种相差较大，总体着火燃烧特性变差．混煤的燃烧特性复杂，与组分煤种的燃烧特性不是简单的线性关系。     

偶联剂对B_4C／PP共混体系的增容作用

Ｂ４Ｃ／ＰＰ共混纤维是重要的防中子辐射材料。通过Ｂ４Ｃ／ＰＰ共混体系流变性能及纤维的形态结构性能的研究，分析了钛酸酯偶联剂在Ｂ４Ｃ／ＰＰ共混体系中的增容作用，表明了最佳偶联剂的品种和用量分别为ＮＤＺ－１０１和１．５～２．５％．