湿法消解-火焰原子吸收光谱法测定两种茶叶中锌、铁、铜、锰的含量

本实验采用湿法消解处理样品、火焰原子吸收光谱法测定样品溶液中的四种微量元素.结果:北川绿茶中Zn、Fe、Cu、Mn的含量分别为10.60μg/g、66.55μg/g、8.80μg/g、145.8μg/g,北川茉莉花茶中Zn、Fe、Cu、Mn的含量分别为11.40μg/g、64.35μg/g、9.20μg/g、149.2μg/g.两种茶叶的相对标准偏差(RSD)均小于1.0%,线性范围在0.00²0.00μg·m L-1,平均回收率在95.5%20.00μg·m L-1,平均回收率在95.5%¹01.0%.该方法简单、快速、准确性高用于两种茶中四种微量元素的测定,结果令人满意.     

克霉灵对毛木耳及绿色木霉菌丝生长的影响

采用二倍稀释法测定了克霉灵对毛木耳(Auriculariapolytricha)及绿色木霉(Trichodermaviride)菌丝生长的影响.结果表明:不同浓度的克霉灵对绿色木霉菌丝生长均表现为抑制作用,其中以1600μg/ml和3200μg/ml克霉灵对绿色木霉菌丝生长抑制作用最强,200μg/ml～1600μg/ml的克霉灵对毛木耳菌丝生长有促进作用,其中1600μg/ml的克霉灵促进作用最强,而3200μg/ml的克霉灵对毛木耳菌丝生长有抑制作用.     

玉米花粉多糖对自由基清除作用的研究

对羟基自由基和超氧阴离子自由基的清除试验表明,不同玉米花粉多糖级分对二者的清除作用均具有较好的量效关系,且复合一元二次方程模型;清除羟基自由基需要PPM、PMA、PMB及PMC-1的半数浓度分别为104.99μg/mL、146.98μg/mL、172.56μg/mL和149.98μg/mL;清除超氧阴离子需要PP M、PMA、PMB及PMC-1四者的半数清除浓度依次为267.65μg/mL、290.56μg/mL、307.10μg/mL和268.59μg/mL.且玉米花粉多糖中抗氧化活性最强的是PPM和PMC-1.     

氢化物发生—原子荧光法同时测定绞股蓝中的痕量铋和砷

采用氢化物-原子荧光法测定绞股蓝中的痕量铋、砷,实验了酸介质和不同还原荆对测定的影响,考虑了金属离子的干扰.在最佳测定条件下,检出限分别为Bi:0.070μg/L、As:0.085 μg/L.线性范围分别为Bi:0.1～130μg/L、As:0～180μg/L,加标回收率在90.1%～109.4%之阃.结果表明本法具有快速、简便、准确等特点.     

佝偻病儿童头发中铁、铜、钙、锌的分析

对61例健康儿和50例佝偻病儿童头发中铁、铜、钙、锌进行了测定,健康儿童头发中铁、铜、钙、锌分别为21．8μg/g、12．4μg/g、1682．6μg/g和143．6μg/g佝偻病儿童头发中铁、铜、钙、锌分别为21．6μg/g、12．3μg/g、781．2μg/g和84．5μg/g。     

离子缔合光度法测定微量锌的研究

提出了Zn(Ⅱ)-SCN-RHB离子缔合物光度法测定微量锌.此方法检出限为0.026μg/ml,线性范围为0.13～0.65μg/ml,RSD为0.89%.     

狗肉软包装制品加工技术研究

主要研究了改善狗肉软包装制品的风味、色泽及提高出品率的工艺条件,同时对其杀菌方法进行了初步探讨.结果表明:于狗肉中加入食盐2%,白糖1%、亚硝酸钠70μg/g、抗坏血酸钠500μg/g、维生素pp和维生素C混合粉300μg/g、复合磷酸盐0.3%,在4℃条件下腌制30h,搅拌5min,采用121℃、25min杀菌,可获得良好的效果.     

大别山葛根微量矿质元素测定及对比分析

为客观了解大别山区葛根微量矿质元素含量,运用国标检测方法,对大别山腹地自然野生葛根和人工种植葛根Fe、Zn、Cu、I、Mn、Se元素含量进行测定,其结果为:人工种植组平均含量分别为58.76μg/g,11.36μg/g,4.85μg/g,3.13μg/g,7.66 1μg/g,1.21μg/g;自然野生组平均含量分别为257.33μg/g,91.58μg/g,6.29μg/g,3.83μg/g,9.23μg/g,1.23μg/g。说明:在葛根Fe、Zn微量矿质元素利用开发方面,自然野生组葛具有优越性,而其他矿质元素差异不明显。     

强聚硒酵母摇瓶发酵条件的优化研究

通过摇瓶培养条件试验确定了强聚硒酵母最适发酵条件:麦芽汁%,初始硒浓度20μg/mL,在其发酵进入到对数生长期后再添加亚硒酸钠使硒浓度达到60μg/mL,接种量为10%,在28℃、200 r/min的摇床上培养29 h.在此条件下,强聚硒酵母生物量(干重)达到8.25 g/L,酵母细胞中硒含量达到1230.21μg/g.     

火焰原子吸收法测定青荚叶中多种金属元素

为了开发青荚叶新资源,采用火焰原子吸收分光光度法测定青荚叶中元素Ca、Cu、Fe、Zn、Mg的含量。结果显示：Ca、Cu、Fe、Zn、Mg的含量青荚叶叶中分别为237.3μg/g、2.557μg/g、321.0μg/g、45.24μg/g、715.8μg/g;在青荚叶茎中的含量分别为529.3μg/g、1.273μg/g、61.05μg/g、12.84μg/g、380.2μg/g,青荚叶根中的含量分别为528.9μg/g、3.155μg/g、210.6μg/g、13.80μg/g、855.3μg/g。原子吸收分光光度法测定元素的方法简便、快速、灵敏、准确。青荚叶中含有较丰富的微量元素,具有广阔的开发应用前景。     

基于LOTUS R5平台智能小区信息管理系统

ＮＯＴＥＳ是实现和运行办公自动化的最有效的平台之一．本文首先简要地介绍了企业创建内联网（ＩＮＴＲＡＮＥＴ）的必要性，并总结了基于ＤＯＭＩＮＯ／ＮＯＴＥＳ构建ＩＮＴＲＡＮＥＴ、实施企业办公自动化方面的优势和特点；通过论证，提出了使用ＤＯＭＩＮＯ／ＮＯＴＥＳ开发“智能小区信息管理系统”的解决方案；最后介绍了本系统的设计思路及各部分功能模块，并对一些关键问题进行了讨论．     

Assessment of student learning: Evolution of objectives in engineering education and the consequences for assessment

The focus of objectives of engineering education has evolved from knowledge to skills. This is a logical consequence of the changing demands of employers of graduated engineers. This change is referred to as a paradigm shift in engineering education. It is therefore not surprising that the views on assessment of student learning are changing as well. In this paper the relation between the demands and the educational objectives are reviewed. Consequently, the implications for assessment are discussed. Assessment is introduced as a feedback procedure. It is discussed that in fact four different feedback pathways can be identified. Finally, the relation between educational methods and their relation to assessment is discussed in detail. As an example, the problems in assessment of group work are discussed.     

运用多媒体手段 加强机械基础教学

通过实例介绍了多媒体手段在机械基础教学中的具体运用，并对其在提高课堂教学效果，加强实验教学等方面的应用作了探讨。     

高职物理教学改革之我见

从物理知识在人才能力培养中的作用出发，指出物理教学在高职教学中的必要性；并从教什么和怎么教两个角度谈高职物理教学改革。     

数字水印技术及其在电子商务中的应用

本文介绍一门新兴的信息安全技术——数字水印技术,然后讨论了电子商务中存在的安全问题及其数字水印技术在电子商务(移动商务)中的应用。     

How do wings generate lift?

A cambered surface that is moving forward in a fluid generates lift. To explain this interesting fact in terms of simpler models, some preparatory concepts were discussed in the first part of this article. We also agreed on what is an acceptable explanation. Then some popular models were discussed. Some quantitative theories will be discussed in this concluding part. Finally we will tie up all these ideas together and connect them to the rigorous momentum theorem.     

教学软件中题型模板的设计方案

该文针对练习和测试的题目信息嵌入于程序结构之中而不利于软件的维护和再利用这一问题,提出了解决信息与结构分离的方法。并就填空题探讨了题型模板的多种设计方案并在Authorware平台上实现了这些题型模板。     

Curriculum Design and Epistemic Ascent

Three kinds of knowledge usually recognised by epistemologists are identified and their relevance for curriculum design is discussed. These are: propositional knowledge, know‐how and knowledge by acquaintance. The inferential nature of propositional knowledge is argued for and it is suggested that propositional knowledge in fact presupposes the ability to know how to make appropriate inferences within a body of knowledge, whether systematic or unsystematic. This thesis is developed along lines suggested in the earlier work of Paul Hirst. The different kinds of know‐how and their relationships are discussed and it is suggested that they occupy different places and different relationships in any curricular hierarchy. The changing role that knowledge by acquaintance plays within this hierarchy is also discussed. Implications of this account for the current National Curriculum and for curriculum design more generally are discussed, looking at History, Science and Design Technology as examples.     

数理方法思想对物理学教学的指导作用

讨论了数学物理方法的基本思想,通过讨论物理学教学中数学与物理学结合上存在的问题,提出了解决上述问题的几点看法。指出,教师在教学过程中要重视数理方法的思想对物理学教学的指导作用;要重视物理概念、物理规律的教学,强调物理公式中数量关系与物理意义的区别;要注意物理思想的教学,帮助学生创设物理情境,建立物理问题的数学模型。     

Family dynamics and the abuse of adolescents : A case for a developmental phase specific model of child abuse

The phenomenon of adolescent abuse is presented and abusive patterns are discussed. A developmental phase specific model of child abuse is constructed. From this discussion, the utility of abuse in the family is also discussed.