标准油的选择对荧光分光光度法测定水中油的影响

本文研究了标准油对荧光分光光度法测定水中油含量的影响。采用“指纹”鉴别法鉴别油的种类,能准确地选择与样品相同的油作标准,提高方法的准确度。     

闭环辨识方法及其MATLAB仿真

简要介绍了闭环辨识的必要性以及直接辨识方法中的参数辨识方法,最后借用MATLAB语言,结合具体实例给出了基本的程序,完成了闭环辨识的任务,从仿真结果可看出运用MATLAB语言进行闭环系统辨识的准确性.     

语法知识在听力训练中的运用

本文根据心理学关于记忆的原理，对学习外国语时的听力训练过程进行了分析，并且提出：听力训练仅靠听是不够的，还要结合其它能力进行培训，特别是运用语法知识进行分析和判断。因此作者认为结合语法知识进行听力训练是有效地提高听力理解能力的一项重要措施。     

磷矿池水体浮游藻类的生态学研究

通过三、四、五月份的三次采集，鉴定出磷矿池水体浮游藻类共86种，其中蓝藻门3科8属13种，隐藻门、甲藻门、金藻门各1科1属，黄藻门3属3种，硅藻门7科13属19种，裸藻门1科1属3种，绿藻门12科25属45种，对三月份浮游藻类进行数量分析，发现蓝藻占83%。     

下浒海滨岩相潮间带蔓足类生态的研究

福建宁德下浒岩相潮间带蔓足类动物共鉴定8种，隶属于3目6科6属．优势种为白条地藤壶、白脊藤壶、网纹藤壶与鳞笠藤壶．常见的还有日本笠藤壶、龟足等．夏季岩相生物栖息密度为978．5个／m^2，生物量为276．89g／m^2．在潮汐作用下，岩相潮间带蔓足类动物的分布具有垂直分化的特征．垂直分化呈现与潮汐水位线一致的相关关系．群聚现象与其繁殖习性密切相关，同时有助于抵御风浪的冲击．水流畅通有利于蔓足类动物的附着与生长．藤壶对建造和主导岩相生物群落起着重要的生态作用．     

薄层色谱鉴别法在四物颗粒单味药品中的应用

目的：为四物颗粒质量标准提供科学依据。方法：采用薄层色谱法，分别建立方各组成药味的鉴别方法。结果：所建立的方法经过多批次样品的实验，具有简便、快速、专属、稳定、可重复的特点。结论：方法可用于该方质量控制。     

贵金属首饰的鉴别与选购

文章对贵金属首饰的分类、性质、特点、鉴别和选购进行了阐述,使广大读者及消费者能掌握贵金属首饰的鉴别知识及选购首饰时应注意的事项。     

A case study comparison of objective and subjective evaluation methods of physical qualities in youth soccer players

ABSTRACT

Subjective and objective assessments may be used congruently when making decisions regarding player recruitment in soccer, yet there have been few attempts to examine the level of agreement between these methods. Therefore, we compare levels of agreement between subjective and objective assessments of physical qualities associated with youth soccer performance. In total, 80 male youth soccer players (13.2 ± 1.9 years), and 12 professional coaches volunteered to participate. Players were objectively assessed using five fitness measures: Yo-Yo Intermittent Recovery Test Level 1; Countermovement vertical jump; Functional Movement Screen?; 5/20 m sprint; alongside anthropometric measures. Additionally, coaches subjectively rated each player on the same five physical qualities using 5-point Likert scales. Inter-rater agreement between ratings from lead and assistant coaches was established for each age group. Moreover, Bayesian regression models were fitted to determine how well coach ratings were able to predict fitness test performance. Although inter-rater agreement between lead and assistant coaches was moderate-to-substantial (ω = 0.48–0.68), relationships between coaches subjective rating’s and corresponding fitness test performance were only highly related for the highest and lowest performing players. We suggest that while ratings derived from objective and subjective assessment methods may be related when attempting to differentiate between distinct populations, concerns exist when evaluating homogeneous samples using these methods. Our data highlight the benefits of using both types of measures in the talent identification process.     

员工的工作特征与组织认同的关系研究

通过对河南地区的511名企业员工的调查,探讨了工作特征及其各个因素与组织认同的关系。结果发现:组织政治认知与组织认同相关显著,而且工作特征的各个维度对组织认同的各个维度均有较强的预测力。     

煤矿硬岩掘进中爆破参数的优选实践

针对煤矿在坚硬岩石巷道中掘进,从影响岩巷爆破效果的等因素出发,对影响岩巷掘进速度和巷道质量的炮眼深度、掏槽爆破和光面爆破等问题进行了分析和实践探索,总结了较为合理的掏槽形式和掏槽爆破参数及光面爆破参数。