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423 results on '"Zhou, Jiawen"'

5. Grain Size Distribution Analysis of Landslide Dams Caused by Dynamic Accumulation of Weathered Rock Landslides Using Discrete Element Modelling

Author

Peng, Ming, Zhao, Qingxi, Shen, Danyi, Zhu, Yan, Zhao, Qingxin, Zhou, Jiawen, Cai, Shuo, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, and Li, Shaofan, editor

Published
2024
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8. Preliminary Evidence on Measurement Characteristics for the Foundational Assessment of Competencies for Teaching Performance Tasks. Research Report. ETS RR-20-27

Author

Phelps, Geoffrey, Bridgeman, Brent, Yan, Fr, Steinberg, Jonathan, Weren, Barbara, and Zhou, Jiawen

Abstract

In this report we provide preliminary evidence on the measurement characteristics for a new type of teaching performance assessment designed to be combined with complementary assessments of teacher content knowledge. The resulting test, which we refer to as the Foundational Assessment of Competencies for Teaching (FACT), is designed for use as part of initial teacher licensure. Twenty elementary FACT performance tasks (10 for mathematics [MATH] and 10 for reading language arts [RLA]) were developed and then administered to 59 teacher candidates. The results from the pilot indicate that the performance tasks function as designed with candidates completing the tasks on average in approximately 3.5 min. Human raters were able to score the tasks quickly and accurately. All score points were well represented for all the scored tasks. Total scores for all tasks combined and subscores for reading language arts RLA and MATH had respective alpha reliabilities of 0.86, 0.77, and 0.79, with the scores well distributed across the scale. A large majority of teacher candidates participating in the study strongly endorsed the FACT tasks as authentic, assessing valuable competencies, and suitable for use as part of teacher licensure. These preliminary results indicate that the FACT performance tasks show great promise for use in large-scale, high-stakes testing programs that seek to provide evidence of both the knowledge and skills needed for effective teaching.

Published
2020

9. Does Retest Effect Impact Test Performance of Repeaters in Different Subgroups? Research Report. ETS RR-20-16

Author

Zhou, Jiawen and Cao, Yi

Abstract

In this study, we explored retest effects on test scores and response time for repeaters, examinees who retake an examination. We looked at two groups of repeaters: those who took the same form twice and those who took different forms on their two attempts for a certification and licensure test. Scores improved over the two test attempts, and repeaters taking the same form twice tended to have larger score gains than those taking different forms. This trend was more salient for female examinees than male and for White and Hispanic/Latino examinees than examinees from other ethnicity groups. In addition, over a third of the examinee responses were incorrect on the same form for both attempts, indicating that the knowledge required for these items was not addressed after these repeaters failed their initial attempt to answer those items correctly. Factors that may be related to these findings are discussed.

Published
2020

24. The generation mechanism of demolding force based on the mold-part interface contact mode in micro-injection molding

Author

Zhou, Jiawen and Qiu, Zhongjun

Subjects
Injection molding -- Equipment and supplies, Engineering and manufacturing industries, Science and technology
Abstract

Demolding is the key step of micro-injection molding ([micro]IM), which influences the molding quality of polymer parts to a great extent. The essence of demolding is to overcome interface interactions between the mold cavity surface and the part surface, which is closely related to factors such as the cavity surface topography and process parameters. However, a theoretical model predicting the demolding force of [micro]IM is still lacking, resulting in the difficulty of improving the quality of demolding in [micro]IM. Therefore, a comprehensive demolding force model is proposed to clarify the demolding mechanism of [micro]IM. The model focuses on the adhesion behavior and friction behavior in the special contact mode formed by the replication effect of [micro]IM. The theory proof and computation results indicate that the cavity surface topography determines the contact mode of the mold-part interface (MPI), which in turn changes the real interface contact area, the composition mode of adhesion stress, and the friction forms, thereby affecting the adhesion and friction force during demolding. In addition, the process parameters can also change the contact mode of MPI as the process parameters have a great effect on the filling capacity and the degree of replication, thereby influencing the demolding process. KEYWORDS adhesion behavior, demolding force, friction behavior, interface contact mode, microinjection molding, theory and modeling, 1 | INTRODUCTION Micro polymer parts are widely used in medical science, aerospace, precision optics, microelectronics, and other fields. [1,2] As a mass production technique, microinjection molding ([micro]IM) is very [...]

Published
2023
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30. Research on Recreational Behavior Characteristics of People in Landscape Space of Rural New Community in the Western Sichuan Plain—Take Nongke Village in Chengdu as an Example

Author

Erkang, Fu, Zhao, Yuqi, Zhou, Jiawen, Ren, Yuxin, Xi, Li, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Mu, Jiasong, editor, Liu, Xin, editor, and Na, Zhenyu, editor

Published
2022
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