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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
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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

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Pengaruh Influencer Laki-Laki Terhadap Keputusan Pembelian Produk Perawatan Kulit Somethinc Skincare Irvan; Angellice
Konsumen & Konsumsi : Jurnal Manajemen Vol. 2 No. 1 (2023): Konsumen & Konsumsi : Jurnal Manajemen
Publisher : Program Studi Manajemen, Fakultas Bisnis & Akuntansi, Universitas Katolik Musi Charitas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32524/kkjm.v2i1.510

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh influencer terhadap keputusan pembelian produk somethinc skincare. Metode analisis data yang digunakan yaitu deskriptif kuantitatif dengan jumlah 100 responden yang merupakan pengguna aktif sosial media, pengguna produk perawatan kulit, dan mengetahui brand Somethinc Skincare. Teknik pengambilan sampel yang digunakan adalah purposive sampling yang merupakan jenis sampel non-probabilitas. jumlah sampel yang digunakan adalah 100 orang. Teknik pengumpulan data yang digunakan yaitu dengan menggunakan kuesioner dan alat analisis data yang digunakan adalah analisis regresi linear berganda dengan spss 25. Hasil penelitian menunjukan bahwa influencer berpengaruh signifikan terhadap keputusan pembelian produk somethinc skincare.
The Impact of Highest Rally Training on Improving Drive Shot Ability in Squash Games Irvan; Syafruddin, Muhammad Akbar; Sufitriyono
ETDC: Indonesian Journal of Research and Educational Review Vol. 3 No. 2 (2024): March
Publisher : Education and Talent Development Center Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/ijrer.v3i2.1511

Abstract

The goal of this research is to ascertain how high-level rally training affects students' efforts to improve their forehand drive and hitting ability in squash at Makassar State University's Faculty of Sports Science. The sampling technique we used was a random selection of 33 male students. We employed the t-test to analyze the data. The data analysis results indicate that the mean difference between the average pre-test and post-test scores is -13.879, and the sig. 2-tailed is 0.000 or <0.05. Therefore, the highest level of rally training impacts efforts to enhance students' squash forehand driveability, as indicated by the mean difference between the pre-test and post-test scores.
Pre-Service Teacher of PJOK: The Effect of Box Skip Training on Leg Muscle Power Andryawan; Suwardi; Irvan; Hudain, Muh. Adnan; Nurussyariah
ETDC: Indonesian Journal of Research and Educational Review Vol. 3 No. 3 (2024): June
Publisher : Education and Talent Development Center Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/ijrer.v3i3.1872

Abstract

This study aims to ascertain the impact of the Box Skip Exercise on the leg muscle power of pre-service teachers at STKIP YPUP Makassar. This study employs an experimental design, specifically a quasi-experimental design. In this study, the population and sample were the pre-service teachers of STKIP YPUP Makassar, with a sample size of 30 people divided into two treatment groups and a control group. We used the t-test to test the research data. The research data that was tested with the t-test shows that the treatment group's data has a calculated T value that is higher than the T table with a value of 9.291>1.753. The significance value of 0.00 falls below 0.05, indicating that box skip exercise has a significant impact on the leg muscle power of physical education pre-service teachers. In contrast, the data from the control group revealed a calculated T value of 3.674, which exceeded the T table by 1.753. Additionally, the significance value of 0.00 was less than 0.05, indicating that the treatment group had a greater influence than the control group. Based on the above data, we can conclude that the treatment group exerted a greater influence than the control group in enhancing the leg muscle power of physical education pre-service teachers at STKIP YPUP Makassar.
Penggunaan Metode Demonstrasi Dalam Meningkatkan Motivasi Belajar Matematika Siswa Kelas X IPA di SMA Negeri 1 Stabat Hendrik; Irvan; Maradoly
Jurnal Sintaksis Vol 5 No 1 (2023): Jurnal Sintaksis
Publisher : LPPM STKIP AL MAKSUM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55263/sintaksis.v5i1.459

Abstract

The low motivation of students to learn resulted in low KKM scores achieved. Field facts show that many students have not achieved the set KKM scores. Therefore, the use of demonstration methods is considered as a solution to increase student learning motivation, especially in mathematics subjects at SMA Negeri 1 Stabat.This study uses classroom action research methods. The observation results showed an increase from cycle I to cycle II, reaching the high category between 65% to 84%. In cycle I, student motivation was 65.52%, increasing to 86.25% in cycle II, in a very high score range. There was an increase in student learning motivation by 20.73% from cycle I to cycle II.In conclusion, the application of demonstration methods is effective in increasing student learning motivation, both individually and classically. This is evident from the increase in the percentage of student learning motivation from 65.52% (cycle I) to 86.25% (cycle II), which is in the very high score range. Thus, it can be concluded that the demonstration method is effective in increasing students' motivation to learn mathematics.
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)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v8i2.1883

Abstract

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)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v10i1.3271

Abstract

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)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v9i1.3294

Abstract

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

Abstract

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

Abstract

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

Abstract

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%.
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