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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Fourier Sumatra Journal of Disaster, Geography and Geography Education International Journal of Disaster Management Bulletin of Chemical Reaction Engineering & Catalysis
Didik Krisdiyanto
chemistry department UIN Sunan Kalijaga Yogyakarta
Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Mathematics Social Sciences

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PERAMALAN HASIL REAKSI ASETILASI GLISEROL MENJADI TRIACETIN MENGUNAKAN KATALIS SILIKA SULFAT DARI SEKAM PADI DENGAN ANALISA PERSAMAAN REGRESI Krisdiyanto, Didik
Jurnal Fourier Vol 3, No 2 (2014)
Publisher : UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.481 KB)

Abstract

Glycerol is a derivative product of biodiesel transesterification process to obtain methyl ester. Glicerol derivative made from esterification of glycerol and acetic acid with the aid of a catalyst. In this study acetylation residual glycerol production of biodiesel using silica catalyst sulfate from rice husk ask with parameter ratio of reactants, reaction time, reaction temperature, the amount of catalyst and stirring speed. Results from linear regression analysis showed that the equation with reaction time variations have the highest representation of the data that is 0.9984. This is supported by forecasting analysis to predicted the results of experiments with independent variable reaction times. This indicated by the small value of the error either by using MAD, MSE, MAPE and Tracking Signals. This is mean that the equation with independent variable reaction time can be used to predict the results of a qualitative reaction.
Analysis of School Disaster Preparedness in Mount Merapi Eruption-Prone Areas: A Case Study in Sleman Regency, Yogyakarta Krisdiyanto, Didik; Farihah, Tutik
Sumatra Journal of Disaster, Geography and Geography Education Vol. 8 No. 1 (2024): Sumatra Journal of Disaster, Geography and Geography Education (June Edition)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sjdgge.v8i1.591

Abstract

Indonesia, situated within the Pacific Ring of Fire, exhibits a unique combination of dynamic tectonic plates and active volcanoes, rendering it susceptible to various seismic activities, ranging from minor tremors to large-scale earthquakes (megathrust). Volcanic eruptions, a prevalent natural disaster in Indonesia, pose significant threats due to the presence of over 130 active volcanoes, with 129 concentrated on Java Island alone. Among these, Mount Merapi stands out as the most active and perilous, situated 30 kilometers north of Yogyakarta City, spanning the administrative boundaries of Yogyakarta Special Region and Central Java. Educational institutions, particularly schools, serve as vital hubs equipped with resources and infrastructure that demand meticulous preparation for potential disasters. This research endeavors to assess the level of school preparedness in the face of disasters, with a specific focus on volcanic eruptions. Through data processing and analysis, it is discerned that Y Primary School in Girikerto village exhibits the highest average preparedness score across five criteria: disaster management plan, community action plan, rehabilitation efforts, early warning system, and competency (89.66%). This is followed by X Primary School (82.39%) and Z Primary School (22.61%). In a broader context, the study reveals that 17.4% of respondents exhibit low preparedness, 4.35% fall within the medium preparedness category, while 34.8% and 43.5% demonstrate high and very high preparedness respectively.
Community Empowerment Through Bamboo Laminate Technology as Part of Disaster Conservation and Mitigation in Wonokerto, Turi, Sleman, Yogyakarta Krisdiyanto, Didik; Farihah, Tutik; Supriyati, Hikmah
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 10, No 1 (2024): March
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpkm.79899

Abstract

Bamboo is included in the classification of grasses, but because of its large size compared to other types of grass, bamboo is also called "giant grass". Bamboo has the ability to grow fast, reaching 30-100 cm per day. The target of this community service is the empowerment of the Daerah Istimewa Yogyakarta (DIY) Search and Rescue (SAR) Team in Wonokerto to become a transfer agent for laminated bamboo technology through the training provided. The approach used in this community service is based on research that has been carried out in universities (research-based community development) by involving potential communities as social agents and potential assets (assessed-based community development) in the community to support Mount Merapi as a National Strategic Area (KSN). In training implementation, the participants showed high contribution in providing training material, attendance, and involvement. Based on the training survey on bamboo laminate technology, 80.59\% of respondents know the identification material, stage of preparation material, identification of connection mixture, identification of lamination stage, and quality check of laminated bamboo lumbar. The proposed training or assistance for sustainability community services are marketing, business planning, product design, and quality products.
Workload Analysis of Rapid Response Team Regional Disaster Management Agency at the Support Command Post of the COVID-19 Task Force Special Region of Yogyakarta Indonesia Farihah, Tutik; Krisdiyanto, Didik; Murtono, Murtono; Khamidinal, Khamidinal
International Journal of Disaster Management Vol 7, No 1 (2024)
Publisher : TDMRC, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/ijdm.v7i1.36714

Abstract

This Study evaluated mental workload of Rapid Response Team ((RRT) Regional Disaster Management Agency in Special Region of Yogyakarta as funeral team along COVID-19 pandemic. Mental workload is formed due to differences between individual abilities and performance demands of a task within a certain time. NASA TLX is the most widely used mental workload measurement, capable of being used in several levels of workload and sensitive to low workloads. The Rapid Response Team is a team to ensure that the disaster management process carried out quickly, accurately, skilled personnel to back up the medical team who continue to work hard so that the handling of the pandemic virus is better, and the virus does not spread. In this study, the subject of research is the funeral team of Rapid Response Team ((RRT) Regional Disaster Management Agency in Special Region of Yogyakarta Indonesia. Sampling data was collected online and offline using the Goggle Form in the range March-April 2021. There are 28 team members of the RRT who filled out the questionnaire. Workload assessment using the NASA-TLX and OWL methods falls within the range of medium (45.58458; 0.610535), high (74.73789; 0.739889), and very high (87.7969; 0.879976), with an average workload value of high (75.9935; 0.748672). Based on statistical tests using paired t-tests and one-way ANOVA, both methods are declared to be equivalent. The dimension that predominantly contributes to workload according to the NASA TLX method is Effort, followed by Mental Demands. Meanwhile, the factor that predominantly forms the workload according to the OWL method is S2 (Environmental Workloads, sub-factors: improper temperature, chemical exposure), followed by S3 (Body Motion and Postural Workloads, sub-factors: stooping, standing). The research findings offer manual guidance for workload identification, particularly utilizing OWL, serving as the foundation for workload assessment for teams involved in COVID-19, particularly in Indonesia. Additionally, this study also demonstrates that the OWL method possesses the same level of reliability as the NASA-TLX method.
Green Synthesis of ZnO Nanoparticles using Aloe Vera Extract and Xanthan Gum as Modifier for Photocatalytic Degradation of Anionic and Cationic Dye in Aqueous Solution Fajriati, Imelda; Widiakongko, Priyagung Dhemi; Krisdiyanto, Didik; Hermawati, Heti
Bulletin of Chemical Reaction Engineering & Catalysis 2025: Just Accepted Manuscript and Article In Press 2025
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20495

Abstract

This research employed a green synthesis approach to produce zinc oxide (ZnO) nanoparticles, using Aloe vera latex extract as both the natural reducing and stabilizing agent. To improve particle dispersion and suppress agglomeration, Xanthan gum was employed as a biopolymeric modifier. The ZnO nanoparticles were synthesized under ambient conditions without the need for surfactants or hazardous chemicals. Characterization through FTIR, XRD, SEM, TEM, and UV–Vis diffuse reflectance spectroscopy demonstrated that the synthesized ZnO nanoparticles were highly crystalline and adopted a hexagonal wurtzite structure. The incorporation of xanthan gum significantly reduced the crystallite size, enhanced surface homogeneity, and increased the optical band gap energy from 3.19 eV to 3.39 eV. Photocatalytic activity was evaluated using Remazol Yellow (anionic dye) and Rhodamine B (cationic dye) under UV light irradiation. The ZnO-AL/XG nanocomposite exhibited superior photocatalytic performance compared to ZnO synthesized without xanthan gum. This enhanced activity was attributed to improved nanoparticle dispersion, reduced recombination rates of photogenerated charge carriers, and better surface interaction with dye molecules. From the recycling study of ZnO-AL/Xg and ZnO-AL, it has been observed that the photocatalyst is still able to remove the color of the RY and RB solution up to 3 times of use with results above 50% of photodegradation percentage. The findings highlight the potential of Aloe vera–xanthan gum–based synthesis as a sustainable and efficient strategy for producing ZnO nanomaterials applicable in wastewater treatment.
Co-Authors Hermawati, Heti Imelda Fajriati Khamidinal Khamidinal Murtono Murtono Supriyati, Hikmah Tutik Farihah, Tutik Widiakongko, Priyagung Dhemi