Online Journals Universitas Kristen Indonesia
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Analysis of High School Students\u27 Reasoning Ability in Solving Higher Order Thinking Skill Type Mathematics Problems
Full text linkThis study investigates the mathematical reasoning abilities of high school students in North Sumatra who participated in the Del Mathematics and Science Competition (DMSC). Prior studies have revealed that students’ reasoning abilities are generally low; however, limited attention has been paid to their performance in competition-based settings. The purpose of this study is to assess the mathematical reasoning skills of students through higher-order thinking problems adapted from National Science Olympiad (OSN) materials. This research employed a qualitative descriptive method. The participants consisted of 25 high school students who reached the final round of the DMSC. The instrument used was a written mathematical reasoning test consisting of five essay questions. Students’ responses were analyzed using descriptive statistics, including mean scores and percentage values based on established scoring rubrics. The results showed that 18 students were categorized as having low reasoning ability and 7 students had a moderate level. The average reasoning score was 63.84%, which falls into the low category. Although students could perform calculations, most of them struggled with argument validation and logical explanation.The findings emphasize the necessity for educators to develop instructional strategies that foster students’ mathematical reasoning, particularly through approaches that stimulate higher-order thinking skills
Well-Log-Based Analysis of Pore Pressure and Minimum Effective Stress (Fracture Gradient) in the Penobscot B-41 Well, Offshore Nova Scotia: Well-Log-Based Analysis of Pore Pressure and Minimum Effective Stress (Fracture Gradient) in the Penobscot B-41 Well, Offshore Nova Scotia
No full textThis study analyzes pore pressure () and minimum effective stress (fracture gradient) in the Penobscot Offshore Field using well log data from wells Penobscot B-41. The Eaton and Bowers methods were applied to estimate pore pressure and minimum effective stress (fracture gradient), while vertical stress () and minimum horizontal stress () were calculated from density data. The results indicate the presence of a top overpressure zone beginning at approximately 8,376 ftTVD, marked by a significant deviation from the normal compaction trend. A reversal depth is also identified around 9,000-9,200 ftTVD, indicating a shift in the overpressure mechanism from normal compaction to unloading. Pore pressure values derived from both Eaton and Bowers methods show overall consistency, although Bowers tends to yield more conservative estimates in the deeper sections. Unloading is particularly evident in the deeper interval of well Penobscot B-41, where elevated values are observed without corresponding low density, suggesting stress release caused by fracturing or fluid migration. Effective stress () calculations reveal high-risk zones for fracturing at depths greater than 9,500 ftTVD, which should be carefully addressed in mud weight design. Overall, the integration of Eaton and Bowers methods with effective stress evaluation successfully characterizes the geopressured system of the Penobscot Field. These findings provide an essential basis for drilling risk mitigation and casing design optimization.
Keywords: Pore Pressure; Fracture Gradient; Normal Compaction Trend (NCT); Eaton’s Method; Bowers Velocity Model; Penobscot Fiel
Addressing the Limitations of Mathematics Teachers in the CLC Working Area of KRI Tawau, Sabah, Malaysia: A Systematic Literature Review of Contextual Learning Videos Based on the REACT Strategy
No full textThis study analyzes trends and developments of contextual learning videos and REACT strategies in mathematics learning through a Systematic Literature Review (SLR) of 168 papers published between 2020 and 2024. The SLR followed seven stages: (1) developing research questions, (2) building selection criteria, (3) developing search strategies, (4) selecting studies, (5) assessing quality, (6) synthesizing results, and (7) reporting findings. The analysis shows: (1) peak publications appeared in 2021; (2) Research and Development (R&D) methods dominate (33.9%), followed by quantitative (25%), qualitative (22%), and Classroom Action Research (19.1%); (3) no study integrates learning videos with contextual approaches and REACT strategies; (4) research subjects are mostly junior high school students (35.7%), then elementary (23.8%) and high school (16.1%); (5) problem-solving ability is the most studied mathematical skill, while connection and representation skills remain underexplored; (6) learning videos are the most widely used media (33.9%), but none combine them with the REACT strategy. This gap highlights the potential of developing contextual learning videos based on REACT. In contexts such as KRI Tawau, where resources and qualified mathematics teachers are limited, REACT-based contextual videos can serve as effective learning media—supporting or even substituting teachers in delivering materials. They also provide flexibility, as students can access, repeat, and use them anytime and anywhere. Thus, this study recommends future research and development of contextual learning videos integrating REACT strategies to enhance mathematics learning, particularly in areas with limited educational resources.
 
TRANSFORMING INTERNATIONAL CONTRACT LAW TO SUPPORT THE GREEN ECONOMY: NORMATIVE AND PRACTICAL ANALYSIS
Full text linkClimate change and biodiversity loss force the global community to pursue sustainable development paths. The green economy paradigm—defined by the UN Environment Programme (UNEP) as an economy that is low-carbon, resource-efficient, and socially inclusive—provides a framework for environmentally sound growth. This study examines how international contract law, particularly the United Nations Convention on Contracts for the International Sale of Goods (CISG) and the UNIDROIT Principles of International Commercial Contracts, can facilitate the transition to a green economy. Using a combination of normative legal analysis, case studies, and policy comparison, the research identifies the limitations and opportunities for integrating environmental and social criteria into contracts. It reviews green procurement practices and offers legislative and policy recommendations for Indonesia and other developing countries. Although the CISG does not explicitly impose environmental obligations, its underlying principles of good faith and uniformity can be interpreted to promote transparency, traceability, and risk-sharing of environmental impacts. Furthermore, frameworks for green public procurement—such as those advocated by the OECD—demonstrate how government contracting can be a strategic instrument for emission reduction and innovation. The study ultimately recommends revising domestic contract law to incorporate sustainability clauses, harmonizing it with relevant international instruments, providing capacity-building for stakeholders, and fostering public–private partnerships (PPPs) that include environmental criteria from the outset.
Keywords: green economy; international contract law; CISG; green procurement; sustainable development; Indonesia; Paris Agreement
Sosialisasi Penerapan prinsip Airmanship di Perusahaan Pengiriman Barang di PT Ardhya Bumi Persada (ABP)
Full text linkThe Faculty of Law at Dirgantara Marsekal Suryadarma University has successfully conducted a Community Engagement Program (PKM) at PT Ardya Bumi Persada (ABP), emphasizing the critical importance of Airmanship. Staff members now possess a comprehensive understanding that Airmanship encompasses not only inspection and oversight but also strict legal compliance pertaining to aviation safety. Through the implemented methodology of socialization and legal counseling, PT ABP is now equipped to conduct its business operations with elevated safety standards for both its general operations and the shipment of goods, thereby enhancing public trust and bolstering the company\u27s reputation. Through this Community Engagement Program (PKM), ABP staff have gained a deeper understanding of the significance of airmanship and various international regulations, including the Annexes to the Convention on International Civil Aviation, commonly known as the Chicago Convention of 1944, particularly concerning the process of air cargo transportation.Fakultas Hukum Universitas Dirgantara Marsekal Suryadarma telah sukses menyelenggarakan PKM di PT Ardya Bumi Persada (ABP), menekankan pentingnya Airmanship. Staf kini memahami secara komprehensif bahwa Airmanship meliputi pemeriksaan, pengawasan, dan kepatuhan hukum terkait keselamatan penerbangan. Dengan metodologi sosialisasi dan penyuluhan, PT ABP kini dapat menjalankan bisnisnya dengan standar keselamatan yang tinggi untuk operasional dan barang kiriman, meningkatkan kepercayaan publik serta reputasi perusahaan. Melalui PKM ini, staff ABP semakin mengerti dan memahami arti penting airmanship, dan beberapa peraturan internasional, misalnya Annexes (Lampiran) Konvensi Penerbangan Sipil Internasional (Convention on International Civil Aviation) atau biasa disebut sebagai Konvensi Chicago 1944 salah satunya terkait proses pengiriman barang melalui transportasi udara
The Effect Of Discovery Learning Assisted With Heat Transfer Intructions On Improving Student Learning Outcomes
Full text linkThe background to this research is the low of the students’ study results on physic subject, especially on the heat transfer material. This is due to conventional learning methods and the lack of practical tools that support the learning process. To overcome this, researchers applied a discovery learning model assisted by heat transfer teaching aids. This research aimed to see whether the application of discovery learning model assisted by heat transfer has an effect in improving the students; learning results at XI-B class. The research was conducted at SMA Swasta Pondok Daun on Jl. Pekapuran no.78A, Curug, Depok, West Java. A quasiexperimental method was used in this research. The sample in this study was class XI-B as the experimental class and XI-A as the control class for the 2023/2024 academic year. The total number of samples in this study was 52 students. Data was collected using tests which were divided into two: a pretest was carried out to find out how far students had mastered heat transfer before the treatment and a posttest was carried out to find out whether there was an increase in students\u27 mastery of heat transfer material after the treatment. Apart from that, data was also collected through questionnaires to determine the suitability of teaching media tools and the effectiveness of applying the discovery learning model assisted by heat transfer in learning process at the experimental class. Based on the result finding, it can be concluded that, the student’s study results on the heat transfer material in the experimental class has increased as much as 35.77% and 15.97% for the control class. This case can be shown by the students’ mean scores of the pretest as much as 49.04 and 38.46 for the posttest. Meanwhile, in the class control, the students’ mean scores of the pretest as much as 38.46 and 54.43 for the posttest. It means that the application of the discovery learning model assisted by heat transfer is influential and effective in improving the students’ study result
Mitigasi Risiko Penurunan Kinerja Karyawan Melalui Sistem Pelatihan Berbasis Kinerja
Full text linkTujuan penelitian berbasis kinerja untuk mengetahui apakah pelatihan kinerja dapat memitigasi risiko penurunan produktifitas kerja dan meningkatkan keterampilan karyawan menjadi profesional, disiplin, produktif serta berkineja tinggi. Dalam melaksanakan penelitian menggunakan jenis penelitian pustaka (library research), yaitu penelitian yang obyek kajiannya menggunakan data pustaka berupa buku-buku sebagai sumber datanya.
Adapun Hasil Penelitian menunjukan bahwa pelatihan berbasis kinerja memiliki manfaat dan dapat digunakan dalam kondisi lingkungan bisnis yang kompleks. Pelatihan berbasis kinerja memiliki keunngulan dalam pengembangan karyawan memitigasi penurunan kinerja. Pelatihan berbasis kinerja dapat menajadikan karyawan menjadi sumber keunggulan kompetitif yang dapat diandalkan untuk bersaing dengan dunia bisnis yang terus berubah dan kompetitif melalui analisis tentang penurunan kinerja hingga dapat memitigasi risiko penurunan kinerja.
Pelatihan berbasis kinerja juga akan membantu perusahaan memahami faktor apa saja yang perlu dipertimbangkan dalam memitigasi risiko penurunan kinerja sehingga dapat menjaga organisasi atau perusahaan untuk bertahan dan berdaya saing. Selain itu, pelatihan juga penting agar karyawan memiliki kinerja positif, efektif, efisien meningkatkan kompetensi yang dimilikinya serta mampu beradaptasi terhadap perubahan dan lingkungan bisnis dan teknologi, mencapai kinerja yang lebih baik, dan mengembangkan keterampilan kreatif serta mampu memcahkan masalah yang komplek
College Students’ Satisfaction on Digital-based Learning Evaluation Course in Elementary Education Program
Full text linkIn today\u27s digital era, higher education faces new challenges and opportunities, especially in terms of integrating technology in the teaching and learning process. The digital-based learning evaluation course is one form of adaptation to this change. This course is designed to equip students with skills in evaluating and managing learning that utilizes digital technology. Student satisfaction is an important indicator in assessing the effectiveness of this course. This study aims to determine student satisfaction with learning for the Digital-Based Learning Evaluation course in the Elementary School Teacher Education (PGSD) Study Program. This research was conducted using a survey method through giving a questionnaire with a total of 100 respondents who took this course. The questionnaire was given through google form with a total of 18 statements. The data were analyzed descriptively by presenting the acquisition of each aspect of satisfaction. The results show that student satisfaction is in a very high category, namely in the aspect of learning planning at 89.88%, the aspect of teaching ability of lecturers at 90.33% and the use of technology in learning at 86.37%. Thus, the learning process of the Digital-Based Learning Evaluation course has a significant effect on student satisfaction both in terms of lecturer planning and the form of technology used
THE EFFECT OF USING THE YOUTUBE APPLICATION ON STUDENT LEARNING ACTIVITY AND PERFORMANCE ON TWO-VARIABLE LINEAR EQUATIONS
Full text linkThis study aims to determine whether there is an effect of YouTube on student learning activeness and performance in class VIII MTS Tarbiyah Islamiyah Ulumahuam students. This activity was carried out offline. The research subjects were MTS Tarbiyah Islamiyah Ulumahuam students and the sample used amounted to 50 students where 25 participants for the experimental class and 25 participants for the control class. The instrument used is a questionnaire of student activeness and learning performance using YouTube as media and documentation. The analysis techniques used are Normality, Homogeneity, and Hypothesis tests. Based on the results of the research conducted, there is an effect of YouTube on the activeness and performance of student learning with a learning model using YouTube seen from the average value of the questionnaire of student learning activeness and performance, namely with a significant value of 0.000. For hypothesis testing using one-way anova test with significant results of 0.000
 
The Analysis of Junior High School Students’ Metacognitive Skills to Solve the Science Problems
Full text linkIn creating educational objectives aligned with the Learning Compass 2030, it is essential to establish a learning environment where students feel comfortable and to apply learning strategies suited to the characteristics of the learners. The objective of this research is to map students\u27 metacognitive skills to understand their learning strategies in solving science-related problems. This study employs a mixed-methods approach, which involves collecting both quantitative and qualitative data, integrating the two forms of data, and using diverse research designs. The quantitative data were obtained from administering metacognitive skills tests and questionnaires, while qualitative data were gathered from student interviews. The research yielded several findings: (1) expert validity results for the metacognitive skills instrument indicated it is valid, (2) trial testing of the instrument showed it to be reliable and valid, (3) the profile of students\u27 metacognitive skills across all indicators was found to be low in three different schools, and (4) there was a high response rate. The novelty of this research lies in mapping students\u27 metacognitive skills in three different regions after the COVID-19 pandemic