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All Journal Indonesian Journal of Chemistry Unri Conference Series: Community Engagement Journal of Applied Materials and Technology JETE Innovative: Journal Of Social Science Research
Siregar, Siti Saidah
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Public Health Social Sciences Other

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Produksi Biokompos Melalui Teknik Mini Biopori di dalam Wadah Bekas Ramah Lingkungan Untuk Tanaman Hortikultura Dahliaty, Andi; Sophia, Halida; Azlina, Nur; Siregar, Siti Saidah; Susilawati, Susilawati; Nugroho, Titania Tjandrawati
Unri Conference Series: Community Engagement Vol 6 (2024): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.6.247-253

Abstract

Mini biopori is an innovative and efficient technique for producing biocompost. This technique utilizes used containers that are environmentally friendly, allowing the community to independently process household organic waste. In addition to reducing waste, this technique also produces fertilizer that is beneficial for horticultural plants. The purpose of this community service activity is to provide knowledge and insights to the community about the application of mini biopori technology in used containers for horticultural plant production, enhance the community's skills in applying mini biopori technology, utilize the biocompost produced from biopori infiltration holes for planting horticultural crops, and assist the community from an economic aspect (increasing community income) by using simple and inexpensive materials to produce high-value horticultural plants. This activity is conducted in Sungai Berbari Village, Pusako District, Siak Regency. The methods of this community service consist of several stages, including preparation, training through lectures and discussions, practical implementation of the mini biopori technique, and evaluation, which considers the conditions before and after the training activities. The results of this activity indicate that the participants have a better understanding of the biocompost production process and the benefits of the mini biopori technique. All participants (100%) considered the mini biopore technique training to be very beneficial, indicating that this training has successfully provided added value to the participants. A total of 70% of the participants showed an interest in applying the mini biopore technique in their homes. The mini biopore technique is considered effective in managing organic waste, producing beneficial fertilizer, and has the potential to reduce dependence on chemical fertilizers. Additionally, implementing this technique can lower agricultural production costs, increase crop yields, and contribute to long-term economic well-being in the community.
Exploring Pre-Service English Teachers’ Oral Communication Skill at Department of English Education of a University in Riau Province Siregar, Siti Saidah
Innovative: Journal Of Social Science Research Vol. 5 No. 1 (2025): Innovative: Journal Of Social Science Research
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/innovative.v5i1.17539

Abstract

The aim of this research was to explore the level and challenges faced by pre service English teachers in improving their oral communication skill in English. This data was analyzed by using qualitative study. Data from the pre service English teachers were collected mainly using data documentation that helped by using the raters and group interview. The study shows that the pre service English teachers reported three main areas of challenges while using oral communication in micro teaching in front of the classroom; linguistic problems, non-linguistic problems, and Psychological Problems.
Redox-Driven Formation of Hausmannite-Type Manganese Oxide and its Catalytic Performance Awaluddin, Amir; Ilahi, Aulia Nur; Fachran Putra Deraf, Ivano; Siregar, Siti Saidah; Saputra, Edy
Journal of Applied Materials and Technology Vol. 6 No. 2 (2025): March 2025
Publisher : AMTS and Faculty of Engineering - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.6.2.64-70

Abstract

Various manganese oxides have been reported to be an active catalyst for degradation of a dye. The synthetic manganese oxides can be conducted by several methods with the products having the different physicochemical properties and structures. This research focused on the synthesis of  hausmanite-type manganese oxide (Mn2O3)  by hydrothermal method with different mole  ratio  of  KMnO4/glucose (3:1 and 2:3) and its application as a Fenton catalyst   for the degradation of methylene blue (MB). The as-synthesized manganese oxides were then characterized  by XRD for their structure and crystallinity and FTIR and Raman spectroscopy for the lattice vibrations. The average oxide state (AOS) of manganese in the as-synthesized manganese oxide was determined by the back titration method. The XRD results indicated  the presence of mixed phases with hausmanite  phase as major component and  cryptomelane and birnessite phases as minor ones. FTIR spectroscopy results showed the presence of O-Mn vibrations at wavelengths of 468 cm-1, 487cm-1, and 726 cm-1. In addition, Raman spectroscopy results clearly showed the  specific vibrations of hausmanite at 655 cm-1 and 653 cm-1, respectively. The low value of  Mn AOS was obtained when the oxide was prepared in low ratio KMnO4/glucose and short reaction time. The as-synthesized hausmanite was  tested  as the Fenton catalyt for the degradation of MB.  The as-synthesized hausmanite synthesized with different mole rasio and reaction time showed similar catalytic activity for the degradation of MB with the highest MB degradation of 90.76%
An Analysis Authentic Assessment On Speaking Abilities In English Classroom Siregar, Siti Saidah; Zulkifli, Nur Aisyah
Journal of Education and Teaching Vol 6, No 1 (2025): Juli
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/jete.v5i4.20003

Abstract

The authentic assessment as the measurement method to evaluate students’ learning objectives and achievements in the classroom. The application of authentic assessment requires teachers to evaluate students’ in three competencies: attitude, knowledge, and skill. Most teachers and educator said that speaking is the most difficult skill to be assessed by using the authentic assessment, considering the complex features of the assessment. This research was aimed at describing the application of authentic assessment in a speaking classroom which relates to the types of the assessment and the scoring rubric. The subjects of the study were an English teacher and 34 students of the SMK Muhammadiyah 3 Pekanbaru. Descriptive qualitative approach was applied in this research, the data in this study was obtained from observation and document analysis. The results of the study revealed that the teacher used several types of activities to assess students’ speaking skills: (1) attitude assessment , (2) knowledge assessment, and (3) skill assessment. The result of this study indicates that authentic assessment is a feasible way to assess students’ speaking skill and it should be employed in assessing other skills as well for learning languages.
Synthesis and Characterization of CaO-SiO2 Heterogeneous Catalyst of Blood Cockle Shells and Coconut Fiber Ash for Biodiesel Production from Crude Palm Oil Nurhayati, Nurhayati; Muhdarina, Muhdarina; Linggawati, Amilia; Siregar, Siti Saidah
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.91444

Abstract

The utilization of sustainable and renewable materials, specifically CaO derived from blood clam shells and SiO2 extracted from coconut fiber, as catalysts for biodiesel production not only promotes waste valorization but also enhances catalytic efficiency, providing an eco-friendly and effective solution for biodiesel synthesis. The present study was synthesized and characterized CaO-SiO2 catalysts using the impregnation method with SiO2 content at 3, 5, and 7 wt.%. Characterization included surface area (BET), crystallinity and crystal size (XRD), chemical composition (XRF), functional groups (FTIR), and acidity-basicity (pyridine adsorption and titration). The maximum biodiesel yield of 96.29% was achieved under optimized conditions: 2 wt.% catalyst loading, 90-min reaction time, 60 °C temperature, and a 1:9 oil-to-methanol molar ratio, determined using response surface methodology (RSM). The synthesized biodiesel was evaluated according to ASTM D6751 standards, and its purity and methyl ester composition were analyzed using GC-MS. The results showed that the CaO-SiO2 catalyst achieved a biodiesel purity of 97.44%, higher than that obtained with unmodified CaO. This research successfully modified the CaO-SiO2 heterogeneous catalyst, enhancing its surface area and acidity, which led to an increase in the purity and yield of biodiesel synthesized from crude palm oil with high free fatty acid content.
Co-Authors Amilia Linggawati Amir Awaluddin Andi Dahliaty Edy Saputra Fachran Putra Deraf, Ivano Halida Sophia Ilahi, Aulia Nur Muhdarina Muhdarina Nur Aisyah Zulkifli Nur Azlina Nurhayati Nurhayati Susilawati, Susilawati Titania Tjandrawati Nugroho