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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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Analysis for Non-covalent Bonds in Protein Structures Using the DV-Xα Method
Halogen atoms are increasingly recognized for their ability to form non-covalent halogen bonds in protein–ligand complexesy. To systematically evaluate these interactions, we employed the DV-Xα method to calculate bond overlap populations (BOPs) in protein structures containing halogenated ligands. Using the Protein Data Bank, we identified thousands of entries with fluorine, chlorine, bromine, or iodine atoms. Structural coordinates were extracted around the chlorine atoms of the ligand and sub...
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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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Determinan Agresivitas Pajak Sub-sektor Konstruksi Bangunan, Properti, dan Real Estate yang Terdaftar di Bursa Efek Indonesia Tahun 2021-2024
This study aims to analyze the determinants of tax aggressiveness in construction, property, and real estate companies listed on the Indonesia Stock Exchange (IDX) during 2021–2024. The sample consists of 80 companies with 220 observations, selected using purposive sampling based on criteria such as the availability of financial statements and the absence of losses during the research period. The variables include tax aggressiveness (ETR), profitability (ROA), leverage (DAR), board size, and fir...
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Implementasi Kepemimpinan Integratif Berbasis Nilai Profetik: Studi Analitis Gaya Transformasional, Instruksional, dan Servant di SMA Muhammadiyah PK Kottabarat Surakarta
Jurnal Riset sosial humaniora, dan Pendidikan (Soshumdik)
Vol 5
, No 1
(2026)
The principal’s leadership plays a strategic role in determining the direction and quality of educational implementation in schools. This study aims to analyze the implementation of integrative leadership based on prophetic values through the application of transformational, instructional, and servant leadership styles at SMA Muhammadiyah PK Kottabarat Surakarta. Islamic-based schools face challenges in integrating academic excellence with the development of religious character; therefore, a lea...
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Fairness Auditing and Bias Mitigation in Aspect-Based Sentiment Models for Indonesian Public Services
Jondien, Muhammad Shihab Fathurrahman
; Magister of Computer Science, Amikom Purwokerto University, Indonesia
; Hariguna, Taqwa
; Magister of Computer Science, Amikom Purwokerto University, Indonesia
; Saputra, Dhanar Intan Surya
; Magister of Computer Science, Amikom Purwokerto University, Indonesia
Telematika
Vol 19
, No 1
(2026)
This study presents a comprehensive fairness audit and bias mitigation framework for Indonesian sentiment analysis using the SmSA IndoNLU dataset and the IndoBERT language model. The research investigates demographic and linguistic fairness by evaluating model performance across gender and regional groups and introduces an aspect-based extension to assess semantic fairness using an ABSA-style input formulation. Fairness metrics such as ΔF1, Demographic Parity Difference (DPD), and Equality of Op...
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The Effect Of Problem-Based Learning Model Assisted By Live Worksheets On Students' Mathematical Reasoning Ability
International Journal of Research in Education
Vol 5
, No 2
(2026)
This study aims to determine the effects of using the problem-based learning (PBL) model and live worksheet media on students' mathematical reasoning skills. The research method used was quantitative and quasi-experimental. The study included all Grade X students from a private high school in Jakarta who had relatively balanced math skills. The study sample comprised four classes (X.1, X.2, X.4, and X.6), which were randomly selected using random sampling technique and each received a differe...
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Assistance in Developing Herbal Teh Gurah Products to Enhance the Competitiveness of MSMEs in Wukirsari Village, Bantul
Rr. Hawik Ervina
; Shofif Sobaruddin Akbar
; Qristin Violinda
; Natasya Salsa Oktaviana
; Galuh Dwi Wahyu Ningsih
; Atiqah Farahidatul Aliya
Community Service Journal: Adarma Acitya
Vol 1
, No 2
(2026)
Wukirsari Village, located in Imogiri Sub-district, Bantul Regency, has significant potential in developing herbal products based on local wisdom, one of which is Teh Gurah. However, local micro, small, and medium enterprises (MSMEs) still face several challenges, including limited knowledge of product development, packaging, and effective marketing strategies. This community service program aims to enhance the competitiveness of Teh Gurah MSMEs through assistance in herbal product development....
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OPTIMIZATION OF TRICHODERMA GROWTH MEDIA FROM TANGKOS WASTE TO IMPROVE VEGETATIVE GROWTH AND CONTROL GANODERMA BONINENSE IN OIL PALM SEEDLINGS
Agrisaintifika : Jurnal Ilmu - Ilmu Pertanian
Vol 10
, No 1
(2026)
This study evaluated the effectiveness of palm oil empty fruit bunch (EFB)-based growth media inoculated with Trichoderma spp. in enhancing vegetative growth of oil palm seedlings and suppressing Ganoderma boninense. A randomized block design was applied with five treatments: four doses of Trichoderma spp. (2 g, 4 g, 6 g, 8 g) and one untreated control, each repeated eight times. Observed parameters included plant height, stem diameter, leaf number, symptoms of Ganoderma attack, and disease inte...
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THE EFFECT OF GUANO COMPOST AND COMPOST TYPES ON THE GROWTH AND YIELD OF CAISIM MUSTARD (Brassica juncea L.) IN DRY LANDS
Agrisaintifika : Jurnal Ilmu - Ilmu Pertanian
Vol 10
, No 1
(2026)
This research was carried out in September-November 2025 in the Greenhouse and continued at the Laboratory of the Faculty of Agriculture, Science and Health, University of Timor, Sasi Village, Kota Kefamenanu District, North Central Timor Regency, East Nusa Tenggara Province. The most dominant problems in dry land areas include lack of water, acidic soil reaction, lack of nutrients, cation exchange capacity and shallow soil solum. This study aims to examine the effect of providing guano compost...
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