Intervention in teachers’ differential scoring judgments in assessing L2 writing through communities of assessment practice

In writing assessment, the inconsistency of teachers’ scorings is among the frequently reported concerns regarding the validity and the reliability of assessment. The study aimed to find out to what extent participating in a community of assessment practice (CAP) can impact the discrepancies among raters’ scorings. Adopting one group pretest-posttest design, patterns in the teachers’ scoring judgments were explored based on both quantitative and qualitative data. The results indicate significant increase in the degrees of agreement in the teachers’ differential scorings showing changes in their severity tendencies for structural variety, lexical accuracy, organization and mechanics criteria while their scoring judgements on structural accuracy, task achievement, and lexical variety criteria had low levels of agreement.     

DIF比例与纯化方式对LRDIF检测方法的影响研究

本模拟研究的目标组与参照组的项目作答反应数据是通过Rasch模型产生的,模拟研究探讨了LRDIF检测方法在不同DIF比例和纯化方式下的检测效果。研究结果表明:LRDIF方法的检测结果在DIF比例≤40%时是可信的;当采用LRDIF方法进行DIF检测时,有必要对匹配变量进行纯化,最好是能够进行迭代纯化。     

基于差压法的水银式倾角传感器

为车载式喷雾机的喷杆水平控制提出了一种新的差压式倾角传感器,本传感器由差压式传感器、回形玻璃管和水银组成。其原理是用差压传感器将回形管两端水银柱差产生的压力差转换成电压信号,然后经A/D转换电路和微处理器换算成倾角。对本装置进行实际制作和实验标定,结果表明：本倾角传感器的分辨率为0.05o,准确度为0.1o。     

Investigating the theoretical structure of the DAS‐II core battery at school age using Bayesian structural equation modeling

Bayesian structural equation modeling (BSEM) was used to investigate the latent structure of the Differential Ability Scales—Second Edition core battery using the standardization sample normative data for ages 7–17. Results revealed plausibility of a three‐factor model, consistent with publisher theory, expressed as either a higher‐order (HO) or a bifactor (BF) model. The results also revealed an alternative structure with the best model fit, a two‐factor BF model with Matrices (MA) and Sequential and Quantitative Reasoning (SQ) loading on g only with no respective group factor loading. This was only the second study to use BSEM to investigate the structure of a commercial ability test and the first to use a large normative sample and the specification of both approximate zero cross‐loadings and correlated residual terms. It is believed that the results produced from the current study will advance the field's understanding of not only the factor structure of the DAS‐II core battery but also the potential utility of BSEM in psychometric investigations of intelligence test structures.     

MATLAB在复杂化学反应模拟中的应用

解刚性常微分方程组已成为研究复杂化学反应的重要手段，本讨论使用MATLAB的ode23s函数对复杂化学反应进行数值模拟的方法，并对硫化学反应非线性动力学行为进行了模拟研究。     

Computation of one-dimensional consolidation of doublelayered ground using differential quadrature method

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Using Dimensionality-Based DIF Analyses to Identify and Interpret Constructs That Elicit Group Differences

In this paper I describe and illustrate the Roussos-Stout (1996) multidimensionality-based DIF analysis paradigm, with emphasis on its implication for the selection of a matching and studied subtest for DIF analyses. Standard DIF practice encourages an exploratory search for matching subtest items based on purely statistical criteria, such as a failure to display DIF. By contrast, the multidimensional DIF paradigm emphasizes a substantively-informed selection of items for both the matching and studied subtest based on the dimensions suspected of underlying the test data. Using two examples, I demonstrate that these two approaches lead to different interpretations about the occurrence of DIF in a test. It is argued that selecting a matching and studied subtest, as identified using the DIF analysis paradigm, can lead to a more informed understanding of why DIF occurs.     

社会转型期乡村医生的角色变迁——基于差序格局理论的分析

农村社会的变革与调整影响着每一位农村居民.乡村医生作为农村社会有机的一员,他们身上亦在发生深刻复杂的变化.传统的乡土社会中,他们是农村差序格局中的精英,居于农村社会分层的中高层.当前农村社会转型期,农村居民的异质性凸显,农村社会分层不断调整.这一时期乡村医生的社会地位已不若传统乡土社会中的社会地位,这深刻影响着乡村医生的行为方式;同时,他们肩负着农村的基本医疗卫生事业,和新时期农村医改密切相关.把握他们的角色变迁,对于推进新时期农村医改有着重要的参考价值.     

A cross-cultural comparison of non-cognitive outputs towards science between Turkish and Dutch students taking into account detected person misfit

Comparing countries according to their PISA results can be considered cross-cultural studies. An important issue in these studies is that the measurement tools must be culturally and linguistically equivalent. Cultural or linguistic differences in measurement tools may threaten validity. Aberrant behavior is another important factor that affects validity. Person-fit analysis is a statistical method of detecting aberrant individual behavior. This study investigated the effects of students who were flagged as aberrant on a comparison of Turkish and Dutch students’ non-cognitive outputs towards science in the PISA 2015. Whether the items contained differential item functioning (DIF) or not was determined by a Poly-SIBTEST for each scale. Misfit students were detected by non-parametric G_N^p and U3^p statistics. It was determined that flagged students were not effective for comparing the mean of non-cognitive outputs towards science, but it was observed that flagged students had an effect on DIF.     

微分中值定理的不等式形式及其应用

通过弱化中值定理的条件,得到了一个减弱了的结果,即中值定理的不等式形式,它在许多方面有一般中值定理的功效,且用它来证明一些定理时,还减弱了部分条件。