Evaluation of a Web-based learning environment for Hands-on experimentation

The evaluation of learning environments depends highly on the evaluation instruments used and on the position of the evaluation in the design cycle. In this article, we present a use-case report of a summative evaluation of a Web-based learning environment for engineering education that allows small groups of students to conduct hands-on experimentation sessions with local and remote access to laboratory devices. This use-case illustrates an evaluation methodology based on a choice of usability engineering methods. In particular, we define specific metrics that take into account students’ interactions with some of the components of the environment. The metrics defined can easily be extended to any e-learning project involving production and sharing of artifacts in a shared workspace. The methodology is illustrated with the results of a preliminary evaluation with 30 students

Determination of triacylglycerol and fatty acid compositions of Impatiens seed oils using reverse phase high performance liquid chromatography

In the present work, triacylglycerol and fatty acid compositions of Impatiens balsamina L. and Impatiens walleriana Hook.f. seed oils were determined using reverse phase high performance liquid chromatography with both refractive index and spectrophotometric detection

Required flows for aquatic ecosystems in Ma River, Vietnam

Ecological flow requirements for the Ma River in dry season were assessed in three reaches of Ma – Buoi, Ma – Len and Ma – Chu. 5 indictor fish species was chosen based on biodiversity survey and roles of those species in aquatic ecosystem as well as local communities. Biological and hydrological data (dry season of 2016- 2017) and 35 year recorded hydrological data were collected and analyzed as input data for a physical habitat model River HYdraulic and HABitat SImulation Model – RHYHABSIM. Model results shown that the optimal flows of the reaches were very much higher compare with the minimum annual low flow - MALF. In this study, MALF7day were applied to calculate the recommended minimum flows of the three reaches. The recommended required minimum flows for Ma – Buoi, Ma – Len and Ma – Chu reaches were 51 m3/s, 49 m3/s and 61 m3/s, respectively. It must be stressed that this study only assessed whether or not there is enough habitat available for the river to sustain a healthy ecosystem