at enterprises that process secondary copper raw materials, it is customary to extract copper from the spent electrolyte by electroextraction. After electroextraction, the solution is neutralized with lime milk to obtain a gypsum nickel-containing cake or evaporated with the release of a cake containing metal sulfates (Cu, Ni, Zn, Fe), which is sold as a commercial product. The search for effective technological solutions for the selective isolation of secondary non-ferrous metals during the regeneration and complete utilization of copper electro fining solutions is relevant. The paper presents studies of the processing of spent copper electrolyte from the processing of non-ferrous metal scrap at a copper smelter in Kazakhstan. For the processing of the spent electrolyte, a stage-by-stage neutralization was performed using zinc sublimates and potash. As a result of the first stage of neutralization with zinc sublimations to pH 4.7, a precipitate with a content of PbO 44.69 %; Sn?2 16,3.....

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This study aims to identify the role of problem-solving skills as mediator in the relationship between the learning environment and mathematics achievement among secondary school students. This study uses survey method involving a total of 333 Form Four students from ten secondary schools who were selected using two-stage stratified sampling technique. Data were analyzed using the Structural Equation Modelling technique, in which direct and indirect effects between variables were identified. Findings show that the direct effect between learning environment and achievement has decreased from 0.548 (p ..

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Ground reaction force (GRF) is a key metric in biomechanical research, including parameters of loading rate (LR), first impact peak, second impact peak, and transient between first and second impact peaks in heel strike runners. The GRFs vary over time during stance. This study was aimed to investigate the variances of GRFs in rearfoot striking runners across incremental speeds. Thirty female and male runners joined the running tests on the instrumented treadmill with speeds of 2.7, 3.0, 3.3, and 3.7 m/s. The discrete parameters of vertical average loading rate in the current study are consistent with the literature findings. The principal component analysis was modeled to investigate the main variances (95%) in the GRFs over stance. The females varied in the magnitude of braking and propulsive forces (PC1, 84.93%), whereas the male runners varied in the timing of propulsion (PC1, 53.38%). The female runners dominantly varied in the transient between the first and second peaks of verti.....

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Creative pedagogy has been explored extensively, and previous research suggests that there is a gap between the level and practice of creativity of science teachers, and that it varies by school location. The aim of this study was to determine the levels of creativity, and creativity practice of primary school science teachers, and differences in the levels of creativity and creativity practice of primary school science teachers based on school location. The Torrance Tests of Creative Thinking (TTCT) were used to acquire qualitative data from 20 participants, and a questionnaire of creativity practice in science teaching was used to collect quantitative data from 409 participants. The qualitative data were analyzed according to the TTCT scoring technique and the quantitative data were analyzed descriptively using Statistical Package for the Social Sciences 26. This study found that, that while overall teacher creativity was low, the teachers perceived that they employed highly creative.....

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It will be inspiring for the students, to deal with visual learning strategy as it entails creative and critical thinking which students seem to lack. Students' difficulties in relating derivative to its graphical representation is central discussion among the mathematics community and calculus literature. This study evaluates students' ability to use Cartesian graphs, as visual tools, to reason when solving tasks on derivatives and continue to check on the types of conceptual reasoning they assumed. Two tasks were distributed to 194 pre-university students to extract and interpret properties of derivatives. Students exhibit mix levels of graph understanding depending on the degree of difficulty of the tasks, while algebraic methods still dominate their thinking. We conjecture that reading and interpreting graph are not independent of understanding the content knowledge of particular subjects or topics. The results of the study help teachers, curriculum developers and textbook authors .....

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The composites of hydroxyapatite/collagen (HA/Col) were seen to be the most encouraging bone graft because of the likenesses with the natural bones .The aim of the present study was to prepared the fish scales hydroxyapatite/collagen /silver nanoparticles (FsHA/FsCol/AgNPs) as a beads by using infiltration method. FsHA/FsCol/AgNPs composites beads were prepared by using new method (infiltration), including to infiltrated of FsHA beads in the FsCol-AgNPs solution. The composites beads of the FsHA/FsCol have been modified by incorporated with AgNPs. The chemical-physical properties for the prepared beads have been evaluated by using fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX) and x ray diffraction analysis (XRD). The results had revealed that by using XRD and FTIR analysis, the peaks of functional groups of FsCol and AgNPs were observed in the matrix of the beads. FESEM had shown the morphology of beads with i.....

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[No abstract available]..

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- The coronavirus disease 2019 (COVID-19) outbreak in December 2019 had affected the way of living for people around the world including students in educational institutions. These students had to prepare for the continuity of their study mentally and phy..

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Novel coronavirus also known as COVID-19 was first discovered in Wuhan, China by end of 2019. Since then, the virus has claimed millions of lives worldwide. In 29th April 2020, there were more than 5,000 outbreak cases in Malaysia as reported by the Ministry of Health Malaysia (MOHE). This study aims to evaluate the trend analysis of the COVID-19 outbreak using Mann-Kendall test, and predict the future cases of COVID-19 in Malaysia using Recurrent Forecasting-Singular Spectrum Analysis (RF-SSA) model. The RF-SSA model was developed to measure and predict daily COVID-19 cases in Malaysia for the coming 10 days using previously-confi rmed cases. A Singular Spectrum Analysis-based forecasting model that discriminates noise in a time series trend is introduced. The RF-SSA model assessment is based on the World Health Organization (WHO) offi cial COVID-19 data to predict the daily confi rmed cases after 29th April until 9th May, 2020. The preliminary results of Mann-Kendall test showed a de.....

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The focus on economic diversification has led to increased support for the establishment and development of SMEs by Omani government in order to contribute in GDP. Risk management has become a major challenge for SMEs in the country due to the lack of experience and knowledge. This research focuses on 'Risk Practical Management Strategies'adopted by SMEs to manage risk. The research is accomplished through a qualitative approach, gathered primary data through interviews and analyzed thematically to establish the trends and patterns in the data. The findings show that there is substantial awareness of the importance of risk management specially in financial and operational which are the key risks faced by businesses, coupled with reputational risk that is associated with the increased use of ecommerce. The RPMS are largely linked to training and developing awareness about risk among SMEs. ? 2021. Taha Redha Al Qubtan et al; published by UIKTEN. This work is licensed under the Creative C.....

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