浅谈含氟废水的两种治理方法

综述了近年来国内外含氟废水化学沉淀、絮凝沉淀二种处理工艺的研究进展,并对其除氟机理进行了讨论.认为二种处理工艺各有其特点及应用场合:在处理含氟废水过程中,二种处理机理可能同时发生.     

浅谈含氟废水的两种治理方法

综述了近年来国内外含氟废水化学沉淀、絮凝沉淀二种处理工艺的研究进展，并对其除氟机理进行了讨论。认为二种处理工艺各有其特点及应用场合；在处理含氟废水过程中，二种处理机理可能同时发生。     

工程建设PM、CM和PMC三种模式的比较

PM、CM和PMC是三种不同的工程建设模式,产生于不同的历史阶段和市场条件,有着各自的特点和适用范围。文章介绍了三种模式的基本含义及特征,在组织、合同、工作范围以及风险和责任等方面进行了比较研究,并对三种模式的优势和适用条件进行了分析,最后强调在应用时,应根据项目的不同情况和条件来加以选择。     

食品中多种添加剂的检验

本文介绍一种新的检验方法，此方法适用于汽水、葡萄酒、饼干、肉灌肠、干果等食品中脱氢乙酸、安赛蜜、山梨酸、苯甲酸、糖精钠的同时提取与测定，这种方法改变了国标检测方法中只适用液体样品的局限性，和国标方法中一个标准只适用一种添加剂的现状，     

菲利普斯曲线在中国宏观经济中的适用性研究

根据传统菲利普斯曲线理论,通过研究1999年～2009年中国的宏观经济数据,从失业——工资关系、失业——通货膨胀关系、失业——国内生产总值关系这三个方面研究菲利普斯曲线在中国的适用性。研究表明,传统菲利普斯曲线仅在经济危机的特定时期适用于中国,并据此提出了解决国内经济危机的对策:通过财政和货币政策引导资金流向制造业;通过拉动内需来刺激投资、提高就业率;通过中央银行的定向增发票据回收流动性。     

基于三因素模型的IT企业服务质量评价模型研究

服务质量表征要素是评价研究的基础。本文在服务质量评价三因素模型(结果质量、互动质量和物理环境质量)的基础上,结合信息技术企业的特点,引入组织支撑质量因素,构建了适用于信息技术企业服务质量评价的四因素模型,建立了评价指标体系,采用马田系统来对指标体系进行评价,并且结合实际案例验证了模型及方法地实用性。结果表明,本文提出的质量评价模型能够有效地反映信息技术企业的服务质量,在此基础上,本文提出了企业改进服务质量的措施。     

微生物小球及菌液联用改善河道水环境

本文系统分析了河道底泥污染治理常见的物理、化学和生物方法,对比了三种技术的优缺点,提出了一种通过投加复合微生物菌液和固定微生物小球用于河道水污染控制的方法。通过实验分析与研究,总结了两种投加方式的优缺点及适用范围;工程实例结果表明,采用微生物小球及菌液联用可显著改善河道水质,原位修复河道水生态系统,提高水体自净能力。该技术应用前景广阔,值得深入研究和推广应用。     

一种改进的不完全指数复制方法

本文在考虑交易成本和投资组合动态调整的基础上,建立混合整数线性规划模型,引入内核搜索分析框架进行近似求解,并利用沪深300进行实证研究。研究发现,一是相比于基本内核搜索法,增强型内核搜索法仅在基准指数成分股数量很大时才会较大幅度提高求解质量;二是考虑投资组合动态调整的模型不仅更稳健,而且跟踪的继承性和保持性更好,尤其适用于单边市场;三是过度刻画现实交易特征一定程度上会降低不完全指数复制模型的复制和预测效果。     

线性缩聚反应基团数比的研究

线形缩聚反应作为高分子化学的一个重要内容,在高分子领域具有重要的作用,其反应机理、反应特点已经被研究者广泛研究。目前的高分子化学通过基团数比(r)来计算和预测线形缩聚分子量时,适用条件复杂,处理范围有限且分类麻烦。文章通过对线性缩聚反应公式的分析,指出了原来公式的不足,总结出了适用性更好的公式,通过实例来验证了其合理性,并验证了用r计算线形聚合度与用Carothers方程的一致性,深化了对线形缩聚反应的理论认识。     

以绿地为介质的城市景观织补模型与方法

通过分析绿地在织补城市景观方面的独特作用,以维护和延续城市风貌为出发点,建构以绿地为介质的城市景观织补运作机制。归纳出"基质"、"隔离"和"背景"三种适用于多尺度下景观织补的模型,并结合绿地规划设计的流程与特点制定了三种模型的实际运用策略与方法,实现以一种低价而高效的方式织补城市景观片段的目的。     

二氧化钛光催化降解水中污染物性能研究

环境污染引起人们对更多环保技术的关注和研究。TiO2光催化氧化作为一种高级氧化技术,其氧化能力强,催化活性高,生物、化学、光化学稳定性好等优势一直是光催化研究的热点。本文综述了TiO2降解污染物的机理、影响因素以及现在研究的主要方向和工业化发展需要取得的突破。     

Periodic Unobserved Cycles in Seasonal Time Series with an Application to US Unemployment*

We introduce a general class of periodic unobserved component (UC) time series models with stochastic trend and seasonal components and with a novel periodic stochastic cycle component. The general state space formulation of the periodic model allows for exact maximum likelihood estimation, signal extraction and forecasting. The consequences for model‐based seasonal adjustment are discussed. The new periodic model is applied to postwar monthly US unemployment series from which we identify a significant periodic stochastic cycle. A detailed periodic analysis is presented including a comparison between the performances of periodic and non‐periodic UC models.     

The urgent need for figures of merit in order to evaluate the performance of teaching and learning methodologies: constructive criticism from a scientific metrological discipline

An objective criterion for an a priori identification of which methodologies are more appropriate for dealing with the problem of teaching or learning science at a determined school level, in the case of education, are very lax or missed. Today it is difficult to objectively differentiate which is the best strategy for dealing with a determined teaching/learning problem. Objectivity can be achieved through modern logic taken from the formal sciences, such as statistics. In the case of metrological discipline such analytical chemistry, where as in education, there is a continuous development of new methodologies and the performance are always evaluated through which analytical chemist call “figures of merit”. In this article, we establish a guide for future research in education to develop objective parameters (figures of merit) to evaluate and compare different teaching and learning strategies following the example of other disciplines such as analytical chemistry.     

中国GDP的趋势循环分解及其政策含义

本文对UC模型、B-N分解和HP滤波的关系进行研究,并结合中国GDP的数据特征设定UC模型结构,使用1992～2010年的季度数据对实际GDP的趋势成分和循环成分进行估计,实证结果表明2000年到金融危机爆发之前,随机冲击对中国经济长期趋势的正向推动不断加大,自然灾害对长期趋势的影响有限,两次金融危机的影响非常严重;经济波动的正负交替频繁且周期性特征不明显,波动幅度总体呈下降趋势,但2007年后有所加剧;产出缺口对通货膨胀的影响显著,但存在一定的滞后性。     

Shifting to green chemistry: the need for innovations in sustainability marketing

This article analyzes how chemical manufacturers can develop stronger business advantages for green chemistry by rethinking sustainability marketing approaches. Green chemistry is a package of technologies, design principles and tools to reduce the toxicity, resource and energy use, and pollution of chemicals. Using research into US chemical industry efforts, this article introduces green chemistry, and discusses existing weak market signals, ways to market green chemistry and key obstacles to sustainability marketing. It concludes that companies need to generate more information internally, build new relations across supply chains and provide more information externally. Copyright © 2006 John Wiley & Sons, Ltd and ERP Environment.     

Good Analytical Research

The purpose of this commentary is to address the issues raised by Ohlson from the point of view of analytical accounting research. The aim is not only to provide some input to young researchers who are going to publish good research using analytical methods, but also to give some hints to help users of analytical accounting research to understand and interpret the findings of this type of research. Ohlson has taken on a task of identifying a set of critical factors which are likely to lead to successful research. Good research is defined as research that makes an impression. Thus, it is not enough to get the research published – not even in a premier journal. The research should have an impact, the community should learn something. As Ohlson notes, there is enough ‘ordinary’ research. In my view this is the right attitude. Short-term optimization is also widespread in the research community and that is not what we should strive for. With the objective in place, I will continue to analyze the question in relation to analytical research. I start out discussing the aim of analytical research by providing a few examples of good models. The first is the Feltham-Ohlson model and the second is the agency model. Both are simple and elegant models dealing with difficult issues. The analysis proceeds to characterize good models. A good model is a simple model that zooms in on the problem under scrutiny. It is a ‘minimal’ model that contains the problem and nothing outside the problem. I then proceed to characterize good research in an analytical framework. This is research that tackles a problem that is of interest to the users and the researcher. In this process I also identify current notable analytical research. Finally, I contrast this to the recommendations of Ohlson.     

Anglo-American forms of management education: A practice-theoretical perspective

This article is based on a review of three Anglo-American journals of management education research, namely The Academy of Management Learning & Education, The Journal of Management Education, and Management Learning. In order to identify different forms of management education, articles in the journals were read from a practice-theoretical perspective. The main finding is that researchers have described or suggested five different conceptions of management education, which either revise the business-school tradition or provide alternatives to it. One implication of the finding is that it is not reasonable to speak for or against the US model of management education, since there are several. Management education research could thus aim at a more nuanced appreciation of what business-school teachers regard as good education.     

在有机化学实验教学中注重学生创新能力培养

介绍了在有机化学实验教学中渗透学生创新能力培养的实践,详细阐述了在有机化学实验中增加综合实验、设计实验、研究实验、开放实验、参与教师科研实验的具体改革做法,从而提高了学生的创新能力和初步科研能力。     

浅谈高分子化学实验教学

高分子化学实验是高分子专业一门重要的课程,它是联系高分子化学和实际的一个很好的平台,目的是培养学生的高分子合成技能、解决问题的能力及创新意识。本文结合长期的教学经验,给出适合二类师范院校的合理的实验安排,提倡微型化实验模式,并对教学改革提出了一些合理化的建议。     

高职高专化学实验教学改革探索

针对高职高专教育的特点,以及教师在实验课中应发挥的作用,总结了如何正确认识化学实验教学的现状,认真分析化学实验教学中存在的问题,进一步探索解决问题的途径,对改进化学实验教学,培养学生的能力,提高学生的综合素质具有重要的意义。