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The quality of multiple-choice questions (MCQs) as well as the student's solve behavior in MCQs are educational concerns. MCQs cover wide educational content and can be immediately and accurately scored. However, many studies have found some flawed items in this exam type, thereby possibly resulting in misleading insights into students’ performance and affecting important decisions. This research sought to determine the characteristics of MCQs and factors that may affect the quality of MCQs by using item response theory (IRT) to evaluate data. For this, four samples of different sizes from US and China in secondary and higher education were chosen. Item difficulty and discrimination were determined using item response theory statistical item analysis models. Results were as follows. First, only a few guessing behaviors are included in MCQ exams because all data fit the two-parameter logistic model better than the three-parameter logistic model. Second, the quality of MCQs depended more on the degree of training of examiners and less on middle or higher education levels. Lastly, MCQs must be evaluated to ensure that high-quality items can be used as bases of inference in middle and higher education. Keywords: higher education, item evaluation, item response theory, multiple-choice test, secondary education

Herein, the authors review the self-regulation system secured by well-designed hybrid materials, composites, and complex system. As a broad concept, the self-regulated material/system has been defined in a wide research field and proven to be of great interest for use in a biomedical system, mechanical system, physical system, as the fact of something such as an organisation regulating itself without intervention from external perturbation. Here, they focus on the most recent discoveries of self-regulation phenomenon and progress in utilising the self-regulation design. This paper concludes by examining various practical applications of the remarkable materials and systems including manipulation of the oil/water interface, cell out-layer structure, radical activity, electron energy level, and mechanical structure of nanomaterials. From material science to bioengineering, self-regulation proves to be not only viable, but increasingly useful in many applications. As part of intelligent engineering, self-regulatory materials are expected to be more used as integrated intelligent components.

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While Tat-dependent haloarchaeal subtilases (halolysins) have been extensively studied, the information about Sec-dependent subtilases of haloarchaea is limited. Our results demonstrate that proper maturation of Sec-dependent subtilase SptE of Natrinema sp. strain J7-2 depends on the action of halolysin SptA from the same strain, yielding multiple hetero- and autocatalytic mature forms.

This paper contains the description for the submission of Karlsruhe Institute of Technology (KIT) for the multilingual TEDx translation task in the IWSLT 2021 evaluation campaign. Our main approach is to develop both cascade and end-to-end systems and eventually combine them together to achieve the best possible results for this extremely low-resource setting. The report also confirms certain consistent architectural improvement added to the Transformer architecture, for all tasks: translation, transcription and speech translation.

The Three Gorges ship lock is an important part of the Three Gorges project, its completion and using have greatly improved transport conditions of the Yangtze River. With the development of the Yangtze River shelter-forest economy and water transport, the great pressure has been brought to the Three Gorges ship lock, the "bottlenecks phenomenon" of the Three Gorges ship lock is prominent increasingly. In order to improve the navigation capacity of the Three Gorges existing ship lock, and ensure navigation pass through ship lock to be convenient, safe, smooth and orderly, based on analyzing the navigation capacity of the ship lock and its main influencing factors, this paper establish ant colony optimization model for the ship lock arrangement, meantime to design and implement the corresponding algorithm. Computational results show that the application of the ant algorithm to the ship lock arrangement optimization is effective, and it offers a new way to solve this kind of optimization problem, moreover, it also offers technical support for improving the navigation capacity of the Three Gorges existing ship lock.