Development of techno-pedagogy approach learning model to improve digital literation of UPN "Veteran" Jawa Timur’s students

The study objectives were 1) to describe the level of digital literacy of UPN "Veteran" Jawa Timur's  students; and 2) Developing a techno-pedagogy approach to improve digital literacy of UPN "Veteran" Jawa Timur's students. This research innovation is developing of a techno-pedagogy approach model and arranging a techno-pedagogy approach to improve students' digital literacy. This innovation is based on the idea of a pedagogical model which is an important aspect in achieving learning goals in the world of education. In the first study objective, quantitative methods are used, the second research objective uses qualitative methods. Research location at UPN "Veteran" Jawa Timur. This option is to provide insight, knowledge, and solutions to integrated pedagogical problems in learning amid the Covid-19 pandemic. Data were collected from questionnaires and in-depth interviews. Among the data needed are online skills; motivation; online video/audio; internet discussion; supporting elements;  ict abilities; blended learning models; teaching contents; frequencies of face-to-face meeting; regulation; culture

The Effect of Sr2+ and Fe3+ Cations and the Stirring Speed on The Precipitation of Barium Sulfate in a Batch System

The batch system investigation explored the effect of Sr2+ and Fe3+ cations and the stirring speed on the characteristics of precipitated barium sulfate. A series of experiments were conducted to evaluate the rate of barium sulfate precipitation in laboratory equipment from brines containing barium ions (3500 ppm) and varying amounts of Sr2+ and Fe3+ ions (10 and 20 ppm). Kinetic analysis was also performed to explore how stirring speeds (240 and 480 rpm) affect barium sulfate scales' crystallization by increasing the stirring speed and promoting Sr2+ and Fe3+-cation solubility while decreasing the precipitation rate. All solid crystals obtained were mostly pure barite, as the X-ray diffraction (XRD) method confirmed. The SEM micrograph of barite morphology revealed particles with tablet-shaped crystals 2 to 5 nm in size. With the presence of Sr2+ and Fe3+-cation, the shape of barium sulfate was modified into spherical tablets or flower-like clusters of tablets. Meanwhile, the morphological changes could result from increased stirring rates. Moreover, the kinetic results yielded a general reaction rate equation that might be used to estimate barium sulfate deposition in pipelines for various brine, supersaturation, and mixing time durations