Studies on the Inhibitive Properties of Boscia senegalensis in Aluminium-HCl environment

The extracts of Boscia senegalensis was study as corrosion inhibitors for Aluminium in 1M HCl environment using gravimetric and linear polarization methods. The result shows that the extract inhibits the corrosion of aluminium by elongating the latency periods of the metal beyond in the absence of the inhibitor. The results from gravimetric measurements illustrate increase in inhibition efficiency with increment in extract concentration. Linear polarization plots show that the mode of inhibition was mixed type. The observed decrease in corrosion rate was due to adsorption of the extracts on the surface of the metal which obey the Langmuir adsorption isotherm. Adsorption of the extract depends on its chemical composition which showed the presence of various phytochemicals like flavonoids, steroids, tannins and phenolic compounds etc. which has oxygen atoms with lone pair electrons for co-ordinate bonding with metal.

Penggunaan Media Power Point Dalam Pembelajaran Fiqih Ibadah Kelas Vii Di Madrasah Tsanawiyah Negeri 2 Surakarta

In teaching and learning activities, the materials delivered can be supported by presenting the media as an intermediary of the complexity of the material itself. The use of power point media in learning plays an important role as a tool to create effective learning activities, because power point media is used to help teachers in making the learning process more effective and efficient for students. MTs Negeri 2 Surakarta is a school whose all classrooms are completed by projectors. The use of power point in learning Fiqh Ibadah facilitates teachers in conveying the material Fiqh Ibadah and students in understanding the lesson Fiqh Ibadah. For this reason, the author conducts research entitled "The Use of Media Power Point in Learning Fiqh Ibadah of VII grade in Madrasah Tsanawiyah Negeri 2 Surakarta" The problem statements of the study include: (1) How is the process of using power point media in learning Fiqh Ibadah of VII grade in MTs Negeri 2 Surakarta? (2) What are the obstacles in using the power point media in Fiqh Ibadah subject of VII grade in MTs Negeri 2 Surakarta? Therefore, the objectives of the study are to know and describe the use of power point media and barriers to the use of power point media in learning Fiqh Ibadah of VII grade. This research uses field research method by using qualitative approach, by taking background in MTs Negeri 2 Surakarta. Subjects in this study were the principal, teachers and students of MTs Negeri 2 Surakarta. The data collection methods used in this research are interview, observation and documentation. Data analysis used is descriptive qualitative data analysis, that is collected data contains data quotation to describe in the form of words. The results of this study shows that the use of power point media in learning Fiqh Ibadah of VII grade in MTs Negeri 2 Surakarta is very suitable and effective. Hence, it can be easier for students in understanding, mastering and gaining the material taught by the teacher clearly. Besides, what is presented by teachers can be practiced by students. While the obstacles encountered in the use of power point media in learning Fiqh Ibadah of VII geade in MTs Negeri 2 Surakarta is the existence of equipment damage and blackouts, this will hamper the learning. And if the power point does not attract students less respond well. Keywords: The use of power point media, in learning Fiqh Ibadah, VII Grade student

Developing policies for the end-of-life of energy infrastructure: Coming to terms with the challenges of decommissioning

Energy sector policies have focused historically on the planning, design and construction of energy infrastructures, while typically overlooking the processes required for the management of their end-of-life, and particularly their decommissioning. However, decommissioning of existing and future energy infrastructures is constrained by a plethora of technical, economic, social and environmental challenges that must be understood and addressed if such infrastructures are to make a net-positive contribution over their whole life. Here, we introduce the magnitude and variety of these challenges to raise awareness and stimulate debate on the development of reasonable policies for current and future decommissioning projects. Focusing on power plants, the paper provides the foundations for the interdisciplinary thinking required to deliver an integrated decommissioning policy that incorporates circular economy principles to maximise value throughout the lifecycle of energy infrastructures. We conclude by suggesting new research paths that will promote more sustainable management of energy infrastructures at the end of their life

What should be recycled: An integrated model for product recycling desirability

This research was focused on developing a new scientific approach for prioritising recycling of end-of-life products in a circular economy. To date, product complexity based on the mixture of materials has been used as a predictor of what gets recycled. While the separation of materials that make up a product has been modelled as a measure of product complexity, this does not taken into account the benefits and considerations in recycling products. In this paper, a new agenda and approach to prioritise the recycling of products was developed based on a recycling desirability index. The material mixing complexity measure was inverted into a simplicity index and then extended by modelling the security index for the mix of materials and the technological readiness level of recycling technologies. The extended model is proposed as an integrated measure of the desirability of recycling end-of-life products. From this analysis, an apparent recycling desirability boundary, enabling products to be prioritised for recycling, was developed. This model and analysis can be used as an information source in developing policies and product recycling priorities

Tribological design constraints of marine renewable energy systems

Against the backdrop of increasing energy demands, the threat of climate change and dwindling fuel reserves, finding reliable, diverse, sustainable/renewable, affordable energy resources has become a priority for many countries. Marine energy conversion systems are at the forefront of providing such a resource. Most marine renewable energy conversion systems require tribological components to covert wind or tidal streams to rotational motion for generating electricity while wave machines typically use oscillating hinge or piston within cylinder geometries to promote reciprocating linear motion. This paper looks at the tribology of three green marine energy systems, offshore wind, tidal and wave machines. Areas covered include lubrication and contamination, bearing and gearbox issues, biofouling, cavitation erosion, tribocorrosion, condition monitoring as well as design trends and loading conditions associated with tribological components. Current research thrusts are highlighted along with areas needing research as well as addressing present day issues related to the tribology of offshore energy conversion technologies

Teacher educators’ collaboration in subject departments:collaborative activities and social relations

Teacher educators’ collaboration plays an important role in the improvement of teacher education. Many studies in educational research focus on collaboration from 1 particular perspective. A focus on 2 perspectives, a qualitative (focusing on collaborative activities) as well as a quantitative (focusing on relations) perspective, and relating both perspectives, can add to our knowledge. Data were collected in 3 subject departments of a teacher education institute. Findings indicated that educators’ collaborative networks inside the departments could gain from more coherent and dense relations, and that key players were important to support and sustain collaboration. Both perspectives were mildly related, correlations were found for “degree” and “information” (r = .31, p < .05), “degree” and “joint work” (r = .38, p < .01), and “reciprocity” and “joint work” (r = .33, p < .05), no correlations were found for “degree” or “reciprocity” and “discussing”. At the department level, only mathematics showed significant correlations. Results indicated that, in further research, qualitative aspects as well as quantitative aspects should be included