浅谈初三复习应考的几个原则

我在组织初三应考复习中,通过不断的探索、尝试、总结出复习迎考应遵循的四个基本原则:准确原则、精确原则、薄原则、心理辅导原则,现具体简述如下:1准确原则“准确”主要包括四方面:①中考大方向把握准确;②钻研课本找标准;③教材中重点、难点、热点瞄得准;④学生的心理与兴趣摸得准、知识缺陷、思维障碍抓得准。确保“准确”的措施:以课本认真分析研究当上的考试说明,近几年的中考试卷,广泛搜集、查阅、研究物理学科有关期刊杂志上的中考信息;深入学生之中,通过交谈,问卷调查、作业、试卷的批改洞悉学生心理兴奋点与问题所在;将课本中相关…     

氯离子对铂铼双金属催化剂性能的影响

考察了氯离子对[Pt3（CO）6[NEt4]2与Re2（CO）10分浸制备的催化剂性能的影响。发现在催化剂制备过程中加入氛离子，催化性能大大改善。初步分析了氯离子影响催化剂性能的原因。     

Authoring systems reassessed

A study of authoring system technology was done to update a previous study done in 1985. While the earlier study focused on software selection methods, the current one emphasizes trends in authoring tool characteristics, vendor approaches to the market-place, and evaluation methods. It also raises questions about some of the often tacit assumptions underlying the technology's development and use.     

虚拟仿真平台建设促进实验室发展

阐述了我校虚拟仿真平台建设情况,通过建设丰富了我校石油工程及相关专业虚拟仿真实验教学资源,形成了一套完整的虚拟仿真实验教学体系,探索出适用于虚拟仿真实验教学的教学新模式,对我校的石油与天然气工程及相关专业本科实践教学起到了促进作用,推动了我校的实践教学改革与发展。     

Effectiveness of citrate buffer-fluoride mixture in Terumo tubes as an inhibitor of in vitro glycolysis

Introduction

Glycolysis affects glucose determination in vitro. The placement of sample tubes in ice-water slurry with plasma separation within 30 minutes is recommended, or alternatively the use of a glycolysis inhibitor. The aim of our two-steps study was to evaluate which Terumo tube is best for glucose determination in routine clinical setting.

Materials and methods

In the first study, blood from 100 volunteers was collected into lithium heparin (LH), NaF/Na heparin (FH) and NaF/citrate buffer/Na₂EDTA (FC-Mixture) tubes. LH sample was treated as recommended and considered as reference, while FH and FC-Mixture samples were aliquoted, maintained at room temperature (RT) for 1, 2 and 4 hours; centrifuged and plasma analysed in triplicate. In the second study, samples from 375 volunteers were collected in LH, FH and FC-Mixture tubes and held at RT before centrifugation from 10 to 340 minutes, depending on each laboratory practice. Samples were analysed in one analytical run.

Results

In the first study, FH glucose concentrations were 5.15 ± 0.66 mmol/L, 5.05 ± 0.65 mmol/L and 5.00 ± 0.65 mmol/L (P < 0.001) in tubes stored at RT for 1, 2 and 4 hours, respectively. Mean biases in all time points exceeded the analytical goal for desirable bias based on biological variation criteria. FC-Mixture glucose concentrations were 5.48 ± 0.65 mmol/L, 5.46 ± 0.6 mmol/L and 5.46 ± 0.64 mmol/L in tubes stored at RT for 1, 2 and 4 hours, respectively. Mean biases for FC-Mixture glucose in all time points reached optimal analytical goals. In the second study, the biases for LH and FH glucose compared to reference FC-Mixture glucose exceeded the preset analytical goals, regardless of the blood collection to centrifugation time interval.

Conclusions

FC-mixture tubes glucose concentrations were preserved up to 4h storage at RT. We confirmed that NaF alone does not allow immediate glycolysis inhibition in real life pre-centrifugation storage conditions (up to 340 minutes). FC-Mixture should be used exclusively for glucose determination in laboratories unable to implement the recommended blood samples’ treatment.Key words: glucose, pre-analytical phase, sodium fluoride, citrate acidification, stability     

Beyond competition: a comparative review of conceptual approaches to international student mobility

The existing literature offers an instrumentalist approach that focuses on how economic rationality underlies international student mobility (ISM). In response to these instrumentalist accounts, a critical approach emerges and reemphasises the importance of humanity and human rights in ISM and the process of internationalisation of higher education. However, this paper argues that these critical perspectives are insufficient to address the non-instrumental values of ISM. To address this argument, the paper uses the capability approach to reframe the meanings of ISM, thereby broadening the conceptual approaches to this aspect of internationalisation of higher education. Specifically, the paper suggests that international mobility is a way to promote individual freedom. On the conceptual basis of the capability approach, the paper identifies three interrelated orientations for future research on the impact of mobility on international students.     

A Dynamic Food Science Internship Program: Integration of Problem-Based Learning and Student-Centered Mentoring

ABSTRACT: An internship program based upon problem-based learning (PBL) and student-centered mentoring is developed. Food science majors are introduced to the program in their sophomore/junior year and follow a process that involves learning-style assessments, career counseling, and direct contact with industrial mentors to develop a resume. The problems are designed in collaboration with a faculty advisor so the students can apply their knowledge to industrial situations. Assessment of performance is conducted by having students submit weekly journal entries and a final report and participate in a closing interview. The journals and reports are graded on 6 aspects of a pedagogical reasoning model: Comprehension, transformation, implementation, evaluation, reflection, and new comprehension. This trains students to use a range of knowledge within a restrained environment, as well as assisting students to refine the critical food science and interpersonal skills needed for successful careers after graduation.     

一种基于Petri网的足球机器人角色转换的设计

足球机器人具有离散事件系统（DES）的特征，而Petri网是一种很好的离散系统的建模工具，能够比较直观地反映系统的动态特性。因此本文针对多机器人对抗比赛中各个机器人如何分配角色的问题，给出了机器人角色转换的原理和基于计算机多线程编程的动态角色分配协议，并进一步建立了一种基于Petri网的角色转换模型，通过仿真对该模型进行了可达性分析。最后，本文通过实验较好地实现了多机器人之间的角色转换。     

中国近代学官传统的赓续及影响

学官是中国传统社会主管学务的官员和官学教师.中国19世纪末20世纪初发生的"废科举、兴学堂"运动促使社会结构与教育系统发生重要改变,教育行政职能也随之变化.晚清政府出现的视学、劝学员,民国时期的视学、辅导员,及老解放区的巡视员、辅导员都在一定程度上继承了学官的传统:监督或研究、指导学务,并向上级行政部门负责.这一教育行政、研究指导职能"两栖化"的现象对理解当今督学、教研员的职能有所启示.     

低碳转型的驱动机制——研究现状及评述

为了阐明低碳转型的迫切性和内在驱动力,在明确低碳经济概念和特征的基础上,从全球、中国、企业三个层次,对有关低碳转型驱动机制的研究进行文献综述,指出现有研究的不足,并提出未来研究方向.