PEDT导电聚合物气敏特性研究

采用化学聚合法制备了导电聚合物3,4-乙烯二氧噻吩膜,利用扫描电子显微镜和傅里叶变换红外光谱法对薄膜的光学成分及形貌进行了分析。采用叉指电极结构研制出了3,4-乙烯二氧噻吩薄膜气体传感器,研究了3,4-乙烯二氧噻吩薄膜气体传感器对有毒气体NO2和NH3的敏感特性以及其自身的温度特性。结果发现,3,4-乙烯二氧噻吩薄膜气体传感器对低浓度的NO2和NH3都具有很好的敏感特性。该文还对3,4-乙烯二氧噻吩薄膜对NO2和NH3两种气体的敏感机理进行了详细的讨论。     

我国农村中小学体育师资队伍建设中存在的主要问题

文章通过文献资料法和专家访谈法,阐述了我国基础体育课程改革的现状和农村中小学体育师资队伍建设中存在的主要问题,并提出了相应的基础体育改革的措施,以期为我国的基础体育课程改革和体育师资队伍建设提供借鉴.     

Some observations on the KMT dyadic scheme

We point out some useful properties of the KMT dyadic scheme, which was used to construct a Brownian bridge approximation to the uniform empirical process.     

Bailouts: The lesser of two evils?

This paper investigates the relation between bailouts and regulation. Regulation, by limiting the room for government intervention in the market, can affect the likelihood and size of a bailout. While a higher level of regulation is associated with a lower likelihood of a direct acquisition, such countries resort to a higher use of State aid. The findings suggest the more transparent nature of direct acquisitions, makes them the lesser of two evils. In this light, policymakers should monitor State Aid and bailouts together, with the aim of making the former more transparent.     

Expectations and the inertia of inflation: The case of Indonesia

It has long been recognised that the balance between backward-looking and forward-looking expectations has critical policy implications. This is because backward-looking expectations impart a substantial degree of inertia to the inflation rate whereas forward-looking expectations lead to rapid adjustment in response to shocks. In this paper we examine the policy implications for the Indonesian economy of the form taken by the price adjustment equation. We allow for both backward-looking and forward-looking effects of inflation expectations, proxying forward expectations with the realised rate and using a GMM estimator to allow for the resulting endogeneity. Using monthly data from 1980:1 to 2008:12, our estimates show that CPI inflation in Indonesia is significantly determined by backward-looking inflation expectations, forward-looking inflation expectations, the output gap, exchange rate depreciation, and money growth. However, the backward expectation attracts a significantly higher weight than the forward rate leading to the conclusion that inflation in Indonesia has considerable inertia. The implication of this is that a gradualist monetary policy is likely to be more effective as a means of smoothing fluctuations in inflation and real output.     

Money management in blended and nuclear families

In Finland, 9% of the families with children are blended families. Though both the absolute number and the proportion of blended families is increasing throughout Europe, there is still little research information available on how they manage their finances. Blended families are an interesting group to study because their money management is clearly more complex than that of traditional nuclear families. In this paper I examine the extent of the differences between blended and nuclear families in money management, with special reference to bank accounts and the conducting of payments. I also seek to identify factors explaining the differences discovered. The research data comes from an Internet survey conducted in November 2006, which yielded answers from 469 Finnish families with children.The results, confirming earlier findings, suggested that money management is more separated in blended families than in nuclear ones. In nuclear families, both the bank accounts and the paying of expenditures are consistently managed jointly, whereas the spouses in blended families prefer separate bank accounts and display several different practices in the paying of common expenditures. In nuclear families the adults pay the expenditures together, but in blended ones they are responsible for the expenditures of their own biological children.     

CO-tucker: a new method for the simultaneous analysis of a sequence of paired tables

Relationships between species and their environment are a key component to understand ecological communities. Usually, this kind of data are repeated over time or space for communities and their environment, which leads to a sequence of pairs of ecological tables, i.e. multi-way matrices. This work proposes a new method which is a combined approach of STATICO and Tucker3 techniques and deals to the problem of describing not only the stable part of the dynamics of structure–function relationships between communities and their environment (in different locations and/or at different times), but also the interactions and changes associated with the ecosystems’ dynamics. At the same time, emphasis is given to the comparison with the STATICO method on the same (real) data set, where advantages and drawbacks are explored and discussed. Thus, this study produces a general methodological framework and develops a new technique to facilitate the use of these practices by researchers. Furthermore, from this first approach with estuarine environmental data one of the major advantages of modeling ecological data sets with the CO-TUCKER model is the gain in interpretability.     

Bias Correction in the Dynamic Panel Data Model with a Nonscalar Disturbance Covariance Matrix

Abstract

Approximation formulae are developed for the bias of ordinary and generalized Least Squares Dummy Variable (LSDV) estimators in dynamic panel data models. Results from Kiviet [Kiviet, J. F. (1995), on bias, inconsistency, and efficiency of various estimators in dynamic panel data models, J. Econometrics68:53–78; Kiviet, J. F. (1999), Expectations of expansions for estimators in a dynamic panel data model: some results for weakly exogenous regressors, In: Hsiao, C., Lahiri, K., Lee, L‐F., Pesaran, M. H., eds., Analysis of Panels and Limited Dependent Variables, Cambridge: Cambridge University Press, pp. 199–225] are extended to higher‐order dynamic panel data models with general covariance structure. The focus is on estimation of both short‐ and long‐run coefficients. The results show that proper modelling of the disturbance covariance structure is indispensable. The bias approximations are used to construct bias corrected estimators which are then applied to quarterly data from 14 European Union countries. Money demand functions for M1, M2 and M3 are estimated for the EU area as a whole for the period 1991: I–1995: IV. Significant spillovers between countries are found reflecting the dependence of domestic money demand on foreign developments. The empirical results show that in general plausible long‐run effects are obtained by the bias corrected estimators. Moreover, finite sample bias, although of moderate magnitude, is present underlining the importance of more refined estimation techniques. Also the efficiency gains by exploiting the heteroscedasticity and cross‐correlation patterns between countries are sometimes considerable.     

A model for a comparative cost-effectiveness evaluation of two mental health partial care programs.

This study provides a model for comparing the cost-effectiveness of two mental health programs. The example cited examines the cost-effectiveness of a hospital-based and a community-based partial care program. Using each group as its own control, the authors compare patients' use of inpatient hospitalisation and emergency room services during one year prior to and one year subsequent to first admission in day care. In both day care programs, patients substantially reduced their number of inpatient admissions and days. Neither program, however, showed a significant decrease in patients' use of the emergency room. Reflecting the substantially lower costs of the community-based program, the benefit-cost and cost-effectiveness ratios were significantly better in the community-based program than in the hospital-based program. Based on this evidence the authors conclude that the lower-cost, equally effective community-based program should be carefully considered as an alternative for more partial care patients.