Abstract To investigate the effect of content Al powder on acceleration ability aluminized explosives, a series 25mm cylinder experiments was conducted, and Al/LiF is 0%, 15%, 30%. The radial expansion velocities wall were measured through Photonic Doppler Velocimetry (PDV) system. verify that could react with detonation products to release energy, which enhance accelerating explosives. By comp...

We analyzed existing test data and student background data from four different school sites nationwide to examine whether standardized test results may be confounded by the lack of language proficiency of English language learners. Several analyses comparing the performance of limited English proficient (LEP) students and their non-LEP classmates revealed major differences. A Disparity Index wa...

Web content management systems (WCMSs) are a popular instrument for gathering, navigating and assessing information in environments such as Digital Libraries or e-Learning. Such environments are characterized not only through a critical amount of documents, but also by their domain heterogeneity, relative to format, domain or date of production, and their multilingual character. Methods from In...

background: sustained visual attention is a prerequisite for learning and memory. the early evaluation of attention in childhood is essential for their school and career success in the future. the aim of this study was to design, development and investigation of psychometric properties (content, face and convergent validity and test-retest and internal consistency reliability) of the computer -...

The purpose of this instrumental study was to show how to conduct a study aimed at obtaining content validity evidence in the test construction/adaptation process. An applied perspective was used, and this paper presents the content validity analysis of the Spanish adaptation of the State-Trait Cheerfulness Inventory trait form (STCI-T). This paper illustrates the stages required to analyze con...