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Oligonuclear Cobalt Assembly with Schiff-base Ligands
In order to develop molecular magnetic compounds, oligonuclear cobalt complexes with Schiff-base ligands, 1,3-bis(salicylideneamino)-2-propanol (H3salpr), 1,3-bis(5-chlorosalicylideneamino)-2-propanol (H3clsalpr), 1,3-bis(5-bromosalicylideneamino)-2-propanol (H3brsalpr), and 1,3-bis(5-nitrosalicylideneamino)-2-propanol (H3pnsalpr), were synthesized by reaction of cobalt(II) acetate and Schiff-base ligand in organic solvent. The molecular structures of [CoII{CoIII(µ-HL)(µ-CH3COO)(CH3COO)}2] (HL =...
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Optimization of Coconut Fiber and Styrofoam Composition in Concrete to Improve Strength and Sound Absorption
Purwanto
; Firmawan, Ferry
; Ahmad, Fahrudin
; Purwanti, Hani
; Husna, Aimmatul
; Darus, Nadirah
; Haron, Zaiton
; Yahya, Khairulzan
This study aimed to evaluate the effect of coconut husk and Expanded Polystyrene (EPS) composition on the mechanical and acoustic properties of lightweight concrete. The research was conducted experimentally using a two-way factorial design with coconut husk variations of 0%, 0.5%, 1%, 1.5%, and 2% of cement weight and EPS variations of 0%, 10%, 20%, and 30% of coarse aggregate volume. A total of 20 mix variations (5 coir levels × 4 EPS levels) were prepared with three replications for each test...
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System Dynamics-Based Industrial Modeling of Aluminium Processing in Indonesia
Advance Sustainable Science, Engineering and Technology (ASSET)
Vol 8
, No 2
(2026)
The Indonesian aluminum industry has great potential due to its abundant bauxite reserves, but downstream development to increase added value is still limited. This study uses a dynamic system model to simulate the development of Indonesia's aluminum industry, taking into account variables such as bauxite reserves, production capacity, demand, energy costs, raw material prices, and downstream development barriers. A scenario-based simulation method is applied to evaluate the impact of various po...
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Mechanical Performance of Recycled Plastic-Based Paving Blocks with Sand and Fly Ash Fillers
Qomaruddin, Mochammad
; Fakhriyan, Adi Noor
; Saputro, Yayan Adi
; Priastiwi, Yulita Arni
; Fatchur Roehman
; Nasyiin Faqih
; Arif Hidayat
; Akhmad Firdos Khoiril Khitam
Advance Sustainable Science, Engineering and Technology (ASSET)
Vol 8
, No 2
(2026)
The use of recycled plastic waste as a binder for paving blocks has been reported in a number of previous studies. However, most of these studies focus on feasibility and do not clearly explain how different plastic types behave mechanically over time. In this study, the compressive strength performance of paving blocks made from polypropylene (PP), polyethylene terephthalate (PET), and high-density polyethylene (HDPE) was experimentally compared using sand or fly ash as fillers. All mixtures we...
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Development of Canva-Based Mathematics Learning Media to Improve Conceptual Understanding of the System of Linear Equations in Two Variables for Grade VIII Students
Journal of Emerging Technology in Teaching and Learning
Vol 2
, No 1
(2026)
This study aims to develop Canva-based learning media that are valid, practical, and effective in improving students’ conceptual understanding of the System of Linear Equations in Two Variables (SLETV) among eighth-grade students at SMP Negeri 1 Padang Bolak Julu. The research employed a Research and Development (R&D) method using the ADDIE model, which includes the stages of Analysis, Design, Development, Implementation, and Evaluation. The research instruments consisted of questionnaires a...
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DEVELOPMENT OF WAYANG PICTURE GUESSING GAME (TEBANG) LEARNING MEDIA BASED ON QUICK APP NINJA
Journal of Emerging Technology in Teaching and Learning
Vol 2
, No 1
(2026)
This study aims to develop a practical and effective game-based learning media to address the lack of teacher creativity in designing digital media, specifically for Javanese language subject on Wayang material at MI Tegalroso Parakan. This Research and Development (R&D) used the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The research subjects were third-grade students of MI Tegalroso Parakan (n=8). Data collection instruments included needs questionnaires, medi...
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Pengaruh Leverage, Profitabilitas, Sales Growth, terhadap Tax Avoidance: Moderasi Ukuran Perusahaan
Tax is a major source of government revenue; however, tax avoidance remains a significant issue, particularly in the property and real estate sector, which is characterized by high growth and complex financial structures. This study examines the effects of leverage, profitability, and sales growth on tax avoidance, with firm size as a moderating variable. The study employs a quantitative approach, using secondary data from the annual financial statements of property and real estate companies lis...
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Pengaruh Profitabilitas, Likuiditas, Leverage, dan Pertumbuhan Aset terhadap Kebijakan Dividen
The objective of this study is to examine the effects of profitability, liquidity, leverage, and asset growth on dividend policy among food and beverage companies listed on the IDX during 2020-2023. The dependent variable in this study is dividend policy, specifically the proxy dividend payout ratio (DPR). The independent variables, including profitability as measured by return on equity (ROE), liquidity as measured by the current ratio (CR), leverage as measured by the debt-to-equity ratio (DER...
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Architecture and Field Evaluation of an IoT-Integrated Village Information System for Public Service
Hartono, Susilo
; Universitas Muhammadiyah Pringsewu
; Sutikno, Tole
; Ahmad Dahlan University
; Yudhana, Anton
; Ahmad Dahlan University
Telematika
Vol 19
, No 1
(2026)
Village public services often struggle with slow administrative workflows, limited transparency, and unequal access to service information, particularly where processes remain manual and difficult to monitor in real time. This study evaluates a deployed integrated village information system augmented with Internet of Things (IoT) signals—RFID-based operational monitoring and water/electricity facility-status sensing—to assess whether service quality improved after implementation and to clarify t...
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PERBANDINGAN PENGARUH AEROBIK EXERCISE DAN ANAEROBIK EXERCISE TERHADAP PENINGKATAN VO₂MAX PADA REMAJA
Jurnal Kesehatan Al-Irsyad
Vol 20
, No 1
(2026)
VO₂Max merupakan indikator penting kebugaran kardiorespirasi pada remaja dan dapat menurun akibat rendahnya aktivitas fisik. Tujuan Penelitian ini untuk mengetahui perbedaan pengaruh aerobik exercise dan anaerobik exercise terhadap peningkatan VO₂Max pada remaja. Metode Penelitian quasi experimental dengan desain pretest–posttest two group design jumlah responden 32 remaja yang dibagi ke dalam dua kelompok latihan selama empat minggu, alat ukur yang digunakan adalah bleep test. Hasil Kedua jenis...
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