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SYNERGISTIC INTERFACIAL CHEMISTRY OF HUMIC ACID AND ACTIVATED FLY ASH FOR HIGH-PERFORMANCE Mn²⁺ ADSORPTION
Susparini, Ninik Triayu
; Ramadhan, Alamsyah Sultan
; Aferta, Lusi
; Benu, Marlon Jusak Renaldy
; Wijayanti, Sri
; Tantowi, Ali
Jurnal Inovasi Teknik Kimia
Vol 11
, No 1
(2025)
This study developed a hybrid adsorbent derived from activated fly ash (FA) and humic acid (HA) for effective Mn²⁺ removal from aqueous solutions. Fly ash was activated using 1 M NaOH to increase its surface hydroxyl groups (≡Si–OH and ≡Al–OH) and enhance reactivity. The activated FA was then composited with HA, which contains abundant –COOH and –OH groups, forming an inorganic–organic hybrid with improved adsorption capability. The HA–FA composite with a 1:3 mass ratio exhibited the highest Mn²...
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Solar Energy-Based Fisheries Appropriate Technology Program Pokmas Water Resources Management Purwosari Village, Wonogiri
Indonesian Journal of Empowerment and Community Service
Vol 6
, No 2
(2025)
Agriculture, livestock, and fisheries are key sectors that support the economic life of the majority of the Purwosari village community. They face environmental and social vulnerabilities, while also facing economic vulnerability. This is achieved by transforming traditional technologies currently used by the community to increase fisheries yields and downstream marketing through Free Nutritional Meal Kitchens (MBG) in the surrounding Wonogiri area. Strengthening village human resource developme...
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Students' Mathematical Abstraction Thinking Ability with Kinesthetic Learning Style through Multi Representation Discourse Learning Model Assisted by Performance Assessment Integrated with Google Sites
Aini, Sindi Nur
; Waluya, Stevanus Budi
; Prabowo, Ardhi
; Agoestanto, Arief
; Masrukan
; Pramasdyahsari, Agnita Siska
; Bonyah, Ebenezer
Journal of Emerging Technology in Teaching and Learning
Vol 1
, No 2
(2025)
This study aims to describe the mathematical abstraction ability of kinesthetic learners through the application of a Multi-Representation Discourse (MRD) learning model assisted by performance assessment and integrated with Google Sites. This research employed a qualitative descriptive design. The participants were two 11th-grade students at SMA Negeri 11 Semarang identified as having a kinesthetic learning style, selected using purposive sampling. Data were collected through abstraction abilit...
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Klitih In The Digital Era: A Criminogenic Analysis And The Dilemma Of Restorative Justice Implementation
Research Fair Unisri
Vol 9
, No 1
(2025)
The phenomenon of klitih in Yogyakarta represents a form of street violence perpetrated by adolescents, often rooted in complex criminogenic factors such as moral degradation, weak family control, the influence of social media, and the glorification of violence by peer groups. This study employs a descriptive qualitative approach through case analysis and an examination of structural, cultural, and systemic factors influencing juvenile delinquency. The implementation of restorative justice as re...
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Mechanical Properties of Epoxy Composite Reinforced with Spent Coffee Ground and Coffee Husk
Etanto Heiliano Wijayanto
; Imran, Al Ichlas
; Siregar, Januar Parlaungan
; Mohd Ruzaimi Mat Rejab
; Tezara Cionita
; Wisnu Prayogo
; Deni Fajar Fitriyana
; Rozanna Dewi
; Thomas Junaedi
; Agustinus Purna Irawan
Advance Sustainable Science, Engineering and Technology
Vol 7
, No 4
(2025)
This study aims to investigate the effect of increasing the concentration of natural filler on the mechanical properties of Spent Coffee Ground (SCG) / Coffee Husk (CH) reinforced epoxy matrix composite. The materials used in this study are epoxy resin as a matrix and waste coffee grounds and coffee husks as natural fillers with sizes of 100-mesh and concentrations of 10, 20, and 30 wt.%. The results showed that SCG 10 wt.% produced the best mechanical properties compared to the other samples ba...
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Mechanical Performance of Epoxy Composite Reinforced with Wood Dust and Crumb Rubber Waste
Imran, Al Ichlas
; Siregar, Januar Parlaungan
; Cionita, Tezara
; Fitriyana, Deni Fajar
; Anis, Samsudin
; Dewi, Rozanna
; Junaedi, Thomas
; Wijayanto, Etanto Heiliano
; Prayogo, Wisnu
Advance Sustainable Science, Engineering and Technology
Vol 7
, No 4
(2025)
The incorporation of wood dust and crumb rubber waste as filler in polymer matrix composite still requires in-depth evaluation of mechanical properties because they have different characteristics. This study evaluates the tensile, flexural, and hardness properties of epoxy composites reinforced with various fractions of wood dust and crumb rubber (5, 10, and 15%). The results showed that the composite with 5% crumb rubber produced the highest tensile strength of 15.52 MPa (CR5), while the highes...
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Faktor yang Mempengaruhi Keputusan Konsumen Dalam Membeli Sayuran di Pedagang Sayur Keliling
Mediagro: journal of agricultural sciences
Vol 21
, No 2
(2025)
Seller vegetable are actors in the downstream agribusiness subsystem who have a role in distributing vegetable products in residential areas based on considerations to establish direct contact with consumers. This study aims to determine the characteristics of consumers who buy vegetables at mobile vegetable traders and find out what factors influence consumer decisions in Ambarawa Asri Housing in purchasing vegetables at mobile vegetable vendors. This research uses basic quantitative methods wi...
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The PENGUJIAN PRODUKSI BEBERAPA JAGUNG (ZEA MAYS L.) HIBRIDA UNTUK VARIETAS PAKAN BIJI DAN PAKAN SILASE
Mediagro: journal of agricultural sciences
Vol 21
, No 2
(2025)
Maize is the second most important food commodity after rice and a the main source of carbohydrate in Indonesia. The aim of this study was to determine the potential production potential and the appearance of several plant characters in several corn hybrids. The research method was conducted using Randomized Completed Design (RCD)with 3 replications. Analysis of data was done by analysis of variance and if there was a real effect, it was continued with the Honest Significant Difference (HSD). Th...
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GROUP GUIDANCE WITH COMPUTATIONAL RIGOROUS MATHEMATICAL THINKING (CRMT) MODEL TO IMPROVE STUDENTS’S ASSERTIVE COMMUNICATION
Barida, Muya
; Sari, Utari Dwi Perwita
; Hartanto, Dody
; Widyastuti, Dian Ari
; Rofiah, Nurul Hidayati
; Andriyani, Andriyani
COUNSENESIA Indonesian Journal of Guidance and Counseling
Vol 6
, No 1
(2025)
Assertive communication is needed to create comfort in communicating, feelings of mutual respect between individuals, avoiding passive and aggressive communication, and maintaining rights between individuals. This research aims to test the effectiveness of group guidance using the Computational Rigorous Mathematical Thinking (CrmT) model in improving assertive communication. To achieve this goal, the research used a pre-experimental research design. The research subjects were selected using a pu...
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Implementasi Certainty Factors pada Sistem Diagnosa Penyakit Ternak Ayam Berbasis Web
Jurnal Informatika dan Rekayasa Perangkat Lunak
Vol 7
, No 1
(2025)
Chicken becomes one of animals that is mostly cultivated by livestock companies and by people in society. The maintenance and care of chickens must be suitable and proper in order to produce good quality of chickens and avoid disease. Chicken disease is one of the factors of loss for breeders, especially contagious disease, if not handled properly, can infect the other chickens. Therefore, the loss experienced by the breeders will be greater. However, due to the lack of doctors in the Regency of...
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