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All Journal Jurnal Pendidikan IPA Indonesia Indonesian Journal of Science and Technology
M. R. Bilad, M. R.
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Computer Science & IT Education Environmental Science

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Optimization of LNG Cold Energy Utilization via Power Generation, Refrigeration, and Air Separation Rao, V. V.; Putra, Zulfan Adi; Bilad, M. R.; Wirzal, M. D. H.; Nordin, N. A. H. M.; Mahadzir, S.
Indonesian Journal of Science and Technology Vol 5, No 3 (2020): IJOST: VOLUME 5, ISSUE 3, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i3.24888

Abstract

Natural gas is conventionally transported in its liquid form or Liquid Natural Gas (LNG). It is then transported using cryogenic insulated LNG tankers. At receiving terminals, LNG is regasified prior to distributing it through gas distribution system. Seawater has been used as the heat source, which leads to vast amount of cold energy discarded into the water. This work presents the use of LNG cold energy around Melaka Refining Company (MRC). The cold energy is utilized in power generation, propylene refrigeration cycle, and air separation plants. These systems are designed and simulated using a commercial process simulation software. Capital cost (CAPEX) function and revenues of each system are further developed as a function of LNG flowrates. These developed correlations are then used in an optimization problem to seek for the most profitable scenario. The results show that utilizing LNG for air separation unit yields the highest profit compared to power generation and refrigeration plants.
Reflective Practices in Inquiry Learning: Its Effectiveness in Training Pre-Service Teachers' Critical Thinking Viewed from Cognitive Styles Verawati, N. N. S. P.; Hikmawati, H.; Prayogi, S.; Bilad, M. R.
Jurnal Pendidikan IPA Indonesia Vol 10, No 4 (2021): December 2021
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v10i4.31814

Abstract

This study aims to evaluate the effectiveness of reflective practices in inquiry learning to train pre-service teachers' critical thinking skills viewed from cognitive styles. The quasi-experimental design was conducted with two sample groups given the same treatment at the pretest, reflective-inquiry practice learning, and posttest. Before the pretest, each sample was given GEFT (Group Embedded Figures Test) to determine the sample of the FI (field-independent) or FD (field dependent) cognitive style. Two sample groups were pre-service physics teachers (PPT) at two different universities in Mataram, Indonesia. The measurement of critical thinking employed essay tests. Critical thinking skills data were analyzed descriptively (mean difference scores of pretest-posttest and N-gain analysis) and statistically (independent sample t-test) employing SPSS software. The effectiveness of reflective inquiry learning is measured by increasing critical thinking scores where the minimum posttest has the "critical" criteria. The study results indicated that the tendency of cognitive style FI was more dominant than FD. The critical thinking measurement showed that each FD/FI group was categorized as "critical," and the increase of critical thinking scores in the two groups was categorized as a "moderate" category. In line with this, statistical analysis (hypothesis testing at a significance level of 0.05) showed no difference in the increase of critical thinking scores between PPT belonging to FD and FI. This study showed that the reflective practice in inquiry learning effectively improved the pre-service teachers' critical thinking skills with the FD and FI cognitive styles. Reflective practices are a new way of inquiry learning to train critical thinking and can be used as a reference for its structured implementation in regular lectures.
Co-Authors Hikmawati . Jamhari Jamhari Mahadzir, S. Nordin, N. A. H. M. Prayogi, Saiful Rao, V. V. Verawati, N. N. S. P. Wirzal, M. D. H.