PENGARUH MODEL PEMBELAJARAN DESIGNED STUDENT-CENTERED INSTRUCTIONAL TERHADAP KEMAMPUAN REPRESENTASI PESERTA DIDIK SMP

Mathematics has a very important role in the development of modern era so that it needs alternative learning that can be digested well and useful even relevant for learners, especially in terms of representing. One of the alternatives in learning model that can be applied is the learning model of Designed Student-Centered Instructional, the model has an advantage where one phase of learning process using inquiry approach Hands On-Activity that learners do touching on the props so that learners can see and hold objects directly and represent it. The purpose of this research is to know the effect of learning model of Student-Centered Instructional modeled to the ability of student representation and know the students' response to the learning of mathematics by using model of Designed Student-Centered Instructional. The method used in this research was quasi experimental method. The study was conducted in class VIII A as experimental class and VIII B as control class at SMPN 02 Megamendung. The instruments used were test representations, questionnaires and observation sheets. In this research, quantitative data is analyzed by finding mean, standard deviation, normality test, homogeneity test and difference of two mean of learners and qualitative data was analyzed by using likert's attitude scale. Based on quantitative and qualitative data analysis, the concepts of representational ability have a high effect on the learning model of Designed Student-Centered Instructional and have a positive response to learning model of Designed Student-Centered Instructional

Lafadz "dzonna" wa ma yatasharraf minhu fi al-qur'an al-karim (dirasah dilaliyyah)

74 hlm

Lafadz "dzonna" wa ma yatasharraf minhu fi al-qur'an al-karim (dirasah dilaliyyah)

74 hlm

A Comprehensive Study of the Polypropylene Fiber Reinforced Fly Ash Based Geopolymer

As a cementitious material, geopolymers show a high quasi-brittle behavior and a relatively low fracture energy. To overcome such a weakness, incorporation of fibers to a brittle matrix is a well-known technique to enhance the flexural properties. This study comprehensively evaluates the short and long term impacts of different volume percentages of polypropylene fiber (PPF) reinforcement on fly ash based geopolymer composites. Different characteristics of the composite were compared at fresh state by flow measurement and hardened state by variation of shrinkage over time to assess the response of composites under flexural and compressive load conditions. The fiber-matrix interface, fiber surface and toughening mechanisms were assessed using field emission scan electron microscopy (FESEM) and atomic force microscopy (AFM). The results show that incorporation of PPF up to 3 wt % into the geopolymer paste reduces the shrinkage and enhances the energy absorption of the composites. While, it might reduce the ultimate flexural and compressive strength of the material depending on fiber content