Garuda - Garba Rujukan Digital

p-Index From 2019 - 2024

3.264

P-Index

This Author published in this journals

All Journal Jurnal Teknik Kimia USU Jurnal Berita Sosial Journal of Sylva Indonesiana Jurnal Speed (Sport, Physical Education, Empowerment) Jurnal Sintaksis : Pendidikan Guru Sekolah Dasar, IPA, IPS dan Bahasa Inggris PROFICIO: Jurnal Pengabdian Masyarakat Indonesian Journal of Research and Educational Review (IJRER) Jurnal Teknik Kimia USU Aksaqila International Humanities and Social Sciences [AIHSS] Journal Konsumen & Konsumsi: Jurnal Manajemen (KKJM)

Irvan

Unknown Affiliation

Author-ID : 1639706

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

Published : 21 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3

Stabilitas Reaktor Uplow Anaerobic Sludge Blanket-Hollow Centered Packed Bed dalam Produksi Biogas pada Kondisi Ruangan Dana Sembiring, Surya; Irvan; Trisakti, Bambang; Novita Sari Sihombing, Dewi
Jurnal Teknik Kimia USU Vol. 8 No. 2 (2019): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Anaerobic digestation was the docomposition of microbes from organic matter into methane, carbon dioxide, organic nutrients and compost in oxygen depletion and hydrogen gas. This study aimed to obtain the stability of the Uplow Anaerobic Sludge Hollow Centered Packed Bed reactor in biogas production at an ambient state that was seen through pH and alkalinity parameters. The process was carried out by varying hydraulic retention time, ei 45 days, 25 days, 10 days and 6 days with pH maintained 7 (±0,2). Analysis of pH and alkalinity was carried out to assess the stability of the reactor at ambient conditions using samples taken from the reactor overflow. The pH profile produced was relatively stable with a pH range between 5.8 - 7.2. The resulting alkalinity value was relatively stable with a pH range between 2,000-4,000 mg/L. The volume of biogas produced was 470 ml with concentration of methane (CH4), carbon dioxide (CO2) and trace hydrogen sulfide (H2S) respectively by 88.00%, 11.00% and 0.10%.

Stabilitas Digester Anaerobik Satu Tahap dalam Produksi Biogas pada Variasi Temperatur Menggunakan Reaktor Batch Trisakti, Bambang; Irvan; Sitompul, Desi Berliana
Jurnal Teknik Kimia USU Vol. 10 No. 1 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Anaerobic digestion is the decomposition of organic matter by microbes into methane, carbon dioxide, and hydrogen sulfide in the absence of oxygen. This study aimed to obtain the stability of the one stage anaerobic digester in biogas production that was seen through pH and alkalinity parameters. The process was carried out by varying the temperature, which is 35 °C, 45 °C, and 55 °C with pH maintained 7 (± 0.2). Analysis of pH and alkalinity was carried out to assess the stability of reactor using samples taken from the reactor overflow. The pH profile produced was relatively stable with a pH range between 6.8 - 7.3. The resulting alkalinity is relatively stable with aalkalinity range between 3.500 – 4.500 mg/L. The volume of biogas produced at 35 °C, 45 °C, and 55 °C respectively are 2065 mL, 3830 mL, and 4570 mL with the highest concentrations of methane (CH4), Carbon dioxide (CO2) and trace Hydrogen Sulfide (H2S) at a temperature of 55 oC obtained the value of the composition of methane, carbon dioxide, and hydrogen sulfide each at 89,000 %, 11,000 %, and 0,011 %.

Pengaruh Laju Pengadukan Terhadap Stabilitas Digester Anaerobik Satu Tahap pada Pembentukan Biogas dari Limbah Cair Pabrik Kelapa Sawit Menggunakan Lab Scale Reaktor Batch Irvan; Trisakti, Bambang; Azka, Nawalul
Jurnal Teknik Kimia USU Vol. 9 No. 1 (2020): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Mixing is essential to increase the efficiency of interactions between active microbes and organic matter during the anaerobic digestion process. The purpose of this research is to study the effect of mixing rate on the stability of one stage anaerobic digesters in biogas production in terms of pH and alkalinity. The production of biogas from palm oil mill effluent was carried out in a 6000 ml batch reactor at varying mixing rates: 100 rpm, 150 rpm, 200 rpm, 250 rpm, and 300 rpm. The reactor is operated with a mixture condition maintained at a pH of 7 ± 0.2 and an operating temperature of 55 ° C. NaHCO3 is added to the mixture to control and maintain the pH of the mixture. Analysis of pH and alkalinity is carried out every day to see the reactor stability. The best results were obtained at a mixing rate of 200 rpm with the pH produced stable during the process is 7. The alkalinity profile produced at each mixing rate was relatively stable with an alkalinity range is 3500-4500 mg/L. The best mixing rate is 200 rpm with a stable pH and alkalinity and the highest biogas production is 457 ml/day.

Pemanfaatan Tandan Pisang Kepok sebagai Sumber Alkali pada Pembuatan Sabun Cair Amelia, Reny Elvira; Hasibuan, Rosdanelli; Irvan
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.5383

Kepok banana bunches were used as a source of natural alkali in the study of determining the ratio of coconut oil and palm oil in the saponification process using banana bunch ash. Alkali is obtained from the calcination process with variations in temperature of 400 °C, 500 °C, 600 °C, and 700 °C for 4 hours. Characterization of potassium from Kepok banana bunch ash using Atomic Absorption Spectrophotometer resulted in the highest potassium being 58.41% at 600 °C. The potassium obtained is used as a source of alkali in the saponification process of liquid bath soap. In this study, variations in the amount of alkali (30%, 40%, 50%, and 60%), the ratio of coconut oil and palm oil (60:40, 70:30, 80:20, and 90:10 (w/w)) with reaction times were carried out 2.5 hours, 3 hours, and 3.5 hours. The best liquid bath soap was obtained at a ratio of 70:30 (w/w) coconut oil and palm oil and 30% alkali with a reaction time of 2.5 hours which was 81.34%.

Pengaruh Laju Alir Biogas dan Ukuran Partikel Pembentuk Pelet terhadap Penyisihan Karbon Dioksida (CO2) dalam Biogas dengan Proses Adsorpsi - Desorpsi Menggunakan Adsorben Berbasis Zeolit Alam untuk Peningkatan Kualitas Biogas Sidabutar, Rivaldi; Trisakti, Bambang; Irvan
Jurnal Teknik Kimia USU Vol. 12 No. 1 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i1.10134

Adsorption is the process of fluid molecules contacting the surface of a solid material. This study aims to remove carbon dioxide (CO2) gas in biogas using natural zeolite-based adsorbent pellets by adsorption and desorption of CO2 from the adsorbent using air. CO2 removal was carried out to determine the percentage of CO2 removal efficiency with variations in biogas flow rates (100 mL/minute, 300 mL/minute, and 500 mL/minute) and variations in the type of adsorbent pellets (particle size, activation time, calcination time, and dealumination activation treatment). Determination of the percentage of CO2 removal is carried out by flowing the biogas into the column and contacting it with the adsorbent continuously for 30 minutes and the output gas is collected in a gas collector to analyze the remaining CO2 content. The results showed that the best CO2 removal was 97.7% using an adsorbent with a particle size of 140 mesh, 4 hours of calcination, 90 minutes of activation time, and dealumination activation at a flow rate of 100 mL/minute. The breakthrough characteristic curve presents the characteristic “S” profile at constant flow rate (100 mL/minute).

Pengurangan Nilai COD pada Effluent Fermentor Biogas UASB-HCPB dengan Memanfaatkan Mikroalga Chlorella vulgaris Sidabutar, Rivaldi; Trisakti, Bambang; Irvan; Bani, Okta; Nasution, Juan Akmal
Jurnal Teknik Kimia USU Vol. 13 No. 2 (2024): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v13i2.16161

Palm oil mill effluent (POME) is the main waste generated from the palm oil industry. LCPKS has a COD level of 57,000-60,400 mg/L. High levels of COD can harm the environment. LCPKS treatment techniques generally use a combination of anaerobic and aerobic waste treatment methods. The anaerobic process has been conducted using a UASB-HCPB reactor. But, the COD levels of anaerobic results have not reached the quality standards so that further processing is needed. Microalgae have the potential to reduce contaminant levels in wastewater. Chlorella vulgaris microalgae is a microalgae that is widely used in wastewater treatment. This study utilized Chorella vulgaris in reducing the COD levels of the effluent of the UASB-HCPB biogas fermentor with variations in lighting intensity and variations in the ratio of effluent to microalgae. It was found that the lighting intensity of light:dark (24:0) hours provided optimal microalgae growth so as to provide the best COD reduction with a COD reduction efficiency of 87.5%. The ratio of microalgae to effluent of 1000 mL: 500 mL showed the best COD reduction with an efficiency of 93.75%.

Studi Literatur : Peranan Aktivitas Fisik Terhadap Peningkatan Kemampuan Otak dan Aspek Kognitif Syafruddin, Muhammad Akbar; Irvan; Hasanuddin, M. Imran
Jurnal Speed (Sport, Physical Education, Empowerment) Vol 6 No 2 (2023): Jurnal Speed (Sport, Physical Education, and Empowerment)
Publisher : Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35706/jurnalspeed.v6i2.9710

The purpose of writing this article is to explore further the role of physical activity in improving brain function and cognitive aspects and to provide a detailed description of a neuroscientific perspective on how physical activity can contribute to cognitive function in particular. The method used in writing this article is a literature study approach. The sources of information in this article come from various articles on Google Scholar, Elsevier, and Researchgate, using the keywords physical education, physical activity, cognitive aspects, and brain abilities. The articles used as sources of information in this study are articles published between 2013 and 2023. The conclusion from this literature study is that involvement in various physical activities in everyday life can help humans improve brain performance abilities and also encourage improvements cognitive aspect. Keywords: Physical Education, Physical Activity, Increasing Brain ability, Cognitive

Bibliometric Analysis of Research on Mathematics Anxiety in Two Decades Irvan
Aksaqila International Humanities and Social Sciences [AIHSS] Journal Vol. 2 No. 2 (2023)
Publisher : Aksaqila International Humanities and Social Sciences [AIHSS] Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/aihss.v2i2.497

Mathematical anxiety has plagued all levels of math students. Bibliometric analysis is required due to the absence of quantitative research in this field's publications. Employing 496 Scopus literature, this research investigated the evolution of publications pertinent to mathematics anxieties in learning. The descriptive and network analysis software applications Biblioshiny and VOSviewer are utilized. Over the past 20 years, the results demonstrate that the aggregate trend of publications in this field has increased by 25% annually. Frontiers in Psychology is ranked first among publications. The most influential author, E.A. Maloney, had 832 citations and publications. The United States surpassed all other nations in terms of contribution. The article "Mathematics Anxiety and the Affective Decline in Performance" by MH Ashcraft ranks first in annual total and average citations. Psychology and the educational process in college, the primary factors for the emergence of mathematical anxiety, and elementary school math knowledge are the most popular themes among researchers. Given that math anxiety can potentially impair learning, this study aids readers in gaining a deeper understanding of the current corpus of research.

Peran Orang Tua Terhadap Pembinaan Anak Bermasalah di Kelurahan Maricayakota Makassar Irvan; Sakaruddin Mandjarreki
Jurnal Berita Sosial Vol 7 No 1 (2022)
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/beritasosial.v7i1.45037

The role of parents in fostering children is very important in building a sakinah household. The type of research used is descriptive qualitative research. The approach used is a social welfare approach and a sociological approach. Sources of data in this study are parents, children and village officials. The method used in data collection is the method of observation, interviews and documentation. The research instruments used were interview guides, cameras, recording devices, and notebooks. Data processing techniques from all sources obtained. The data analysis technique used is qualitative analysis which is a continuous and repeated effort, the data obtained in the field is processed with the intention of providing information. The results showed that, the efforts made by parents in fostering problem children in Maricaya Baru Village, Makassar District were carried out by giving children a supportive environment at home, giving children enthusiasm in living life, discussing children's problems together, supervising children's activities, balancing attitudes when advise children. The causes of problem children in Maricaya Baru Village from internal factors are biological factors, psychological factors, economic factors, while external factors are educational factors, social factors, lack of communication factors, lack of supervision and environmental factors.

Seedling Growth Evaluation of Rehabilitated Mangrove and Carbon Estimation of Two Types of Mangroves in Perlis, Langkat, North Sumatra Ahmad Hisyam Pulungan; Basyuni, M; Rizka Amelia; Irvan; Astrid Fauzia Dewinta; Julia Syahriani Hasibuan; Itchika Sivaipram
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.13463

Perlis Village is around the mangrove forest in Langkat Regency, North Sumatra, Indonesia. This village has several barren lands potentially planted with mangroves. They were considering that the livelihoods of most of the people were fishermen and mangrove crab catchers. It is necessary to plant and rehabilitate damaged mangrove forests to restore and repair the ecosystem in Perlis Village. Planting activities were carried out in locations considered suitable for planting 200 seedlings. Three transects were made to obtain vegetation analysis data and carbon content. Each transect consists of six plots in natural forest and restoration forest. When the seedlings at the planting location were 3 months old, observations were carried out again, and of the 135 plants, approximately 67.16 percent were still alive from a total of 200 seedlings planted. Carbon storage in natural forests is 69 Mg ha-1 and 41.64 Mg ha-1 in restoration forests. By enriching the methods and estimating the potential carbon stocks of natural and rehabilitated mangroves in Perlis village in the context of Indonesia's climate change mitigation strategy, it is hoped that this information has the potential to help the blue carbon research community and policymakers

Co-Authors Agus Sutriawan Ahmad Hisyam Pulungan Akbar Syafruddin, Muhammad Amelia, Reny Elvira Andi Sahrul Jahrir Andryawan Angellice Astrid Fauzia Dewinta Azka, Nawalul Bambang Trisakti Bani, Okta Basyuni, M Dana Sembiring, Surya Hendrik Hudain, Muh. Adnan Itchika Sivaipram Julia Syahriani Hasibuan M Imran Hasanuddin Maradoly Nasution, Juan Akmal Novita Sari Sihombing, Dewi Nurussyariah Rizka Amelia Rosdanelli Hasibuan Sakaruddin Mandjarreki Sidabutar, Rivaldi Sitompul, Desi Berliana Sufitriyono Suwardi Syafruddin, Muhammad Akbar

Title

Found 21 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 21 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 21 Documents
Search