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Kajian Pengaruh Nanopartikel Magnetik Fe3O4 Pada Deteksi Biosensor Berbasis Surface Plasmon Resonance (SPR) Sihombing, Yuan Alfinsyah; Abraha, Kamsul
Jurnal Ilmu Fisika Vol 9, No 2 (2017): Published in September 2017
Publisher : Universitas Andalas

Telah dilakukan kajian berkaitan dengan pengaruh nanopartikel Fe3O4 pada deteksi biosensor berbasisÂ surface plasmon resonance (SPR). Penelitian ini bertujuan untuk melihat penyebab munculnya dip baru atau pergeseran dip ke arah kanan pada kurva ATR (AttenuatedTotalReï¬‚ection) setelah adanya penambahan nanopartikel magnetik Fe3O4.Sifat magnetik nanopartikel berupa permeabilitas magnet disubstitusikan pada kurva ATR dan sudut SPR terbentuk pada sudut 51,8Âº; 47,3Âº; 46,0Âº dan 45,6Âº untuk ketebalan perak 10 nm, 20 nm, 30 nm dan 40 nm berturut-turut dengan ketebalan nanopartikel 10 nm.Untuk melihat pengaruh permeabilitas magnet, diplot kurva ATR tanpa permeabilitas magnet. Hasilnya menunjukkan bahwa sudut SPR terbentuk pada sudut yang sama. Sehingga kemunculan dip baru pada panjang gelombang sinar laser 632,8 nm bukan dikarenakan sifat magnetnya. Sifat magnet ini akan muncul pada rentang gelombang mikro. Dengan pendekatan Teori Medium Efektif (TME) Landauer dan Bruggeman untuk sistem empat lapisan prisma/perak/komposit (nanopartikel+udara)/udara, diperoleh kurva relasi dispersi surface plasmon pada angka gelombang ; ;; Â dan Â untuk variasi fraksi volume Â 0,1; 0,2; 0,3; 0,4 dan 0,5 berturut-turut mengalami kopling dengan gelombang evanescent. Ini menunjukkan bahwa pergeseran dip muncul dengan pendekatan teori medium efektif Landauer dan Bruggeman.Â Kata Kunci : Surface Plasmon Resonance (SPR), nanopartikel magnetik Fe3O4,Evanescent, , TME Landauer dan Bruggeman.

OPTIMALISASI LABORATORIUM IPA UNTUK MENINGKATKAN MINAT BELAJAR SISWA DI SMP SWASTA ISLAM TERPADU IQRAâ€™ MEDAN Sinaga, Muhammad Zulham Efendi; Sihombing, Yuan Alfinsyah; Syahmarani, Aghni
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 2 (2018): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Laboratorium merupakan sarana yang sangat penting keberadaaannya di satuan pendidikan dasar dan menengah. Laboratorium dengan aktivitas praktikumnya dapat membantu pemahaman siswa terhadap konsep yang dipelajarinya di kelas sehingga meningkatkan minat belajar siswa terhadap sains. Salah satu kompetensi dalam proses belajar mengajar adalah kemampuan siswa memecahkan masalah di kehidupan sehari-hari. Ini bisa tercapai dengan bantuan laboratorium beserta alat peraga yang tersedia di sekolah. Kemampuan psikomotorik siswa akan terasah dalam memecahkan masalah-masalah yang berkaitan dengan konsep sains. Kegiatan pengabdian kepada masyarkat dilakukan dengan beberapa metode yaitu survey awal terhadap permasalahan mitra, merancang alat peraga dan peralatan praktikum, praktikum sederhana di laboratorium danmembuat buku penuntun praktikum. Pada kegiatan praktikumdi laboratorium diperoleh nilai pre-test dengan rata-rata 51,38 dengan nilai tertinggi 70 dan terendah 20. Sedangkan nilai post-test memiliki rata-rata 79,31 dengan nilai tertinggi 100 dan terendah 30. Hasil pre-test dan post-test ini menunjukkan adanya kenaikan nilai rata-rata siswa sebesar 54,36%.

Increased village potential towards creative and independent communities Sihombing, Yuan Alfinsyah; Hulu, Ester Rinaldi; Hutabarat, Tini Ayuna; Puspitasar
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Community service activities are divided into three stages, namely preparation, implementation of activities on site, and evaluation. These community service activities have been carried out in Pematang Marihat Village, Siantar Marimbun District, Pematangsiantar City in the form of health check-up activities namely blood sugar and blood pressure checks, health education, healthy exercise, PHBS which is specialized in dental and mouth hygiene, hands and nails, reactivation hydroponics, planting vegetable seeds in polybags, making Family Medicinal Plants (TOGA), making compost from straw, learning groups and teaching activities in schools. The implementation of these activities is expected to benefit the local community. Get closer to the relationship of higher education with the community where KKN students are located. Train students in studying social phenomena that occur in the community. Providing space and land for students to express their application of theories that have been obtained on campus to become agents of change in society. The activities carried out in support of these activities are morning activities, healthy exercise, non-communicable disease counseling, health and clean lifestyle counseling, blood sugar and blood pressure checks, reactivation of hydroponics, Family Medicinal Plant Manufacturing (TOGA), compost fertilizer production from straw. With the completion of the work program of KKN (Real Work Lecture) Group 2 Pematang Marihat Village, Siantar Marimbun District, Pematangsiantar City, the translation of the Tri Dharma of Higher Education to the community can be carried out well. Through the implementation of this Community Service Program, we can apply the knowledge gained in college in the form of community service in Pematang Marihat Village.

Local bearing empowerment towards smart society Sihombing, Yuan Alfinsyah; Pasaribu, Nora Octavia; Aini, Nur Hizrah; Lumban Gaol, Al Trio Boy Beyto
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Community Service Program (KKN) is a community service activity in certain areas as an implementation of the Tri Darma of Higher Education. Community service activities aim to provide field experience to students by assisting lecturers on the condition of the community directly and also to form an independent attitude and responsibility in carrying out community service activities. In addition, the service of KKN also aims to help the community in improving welfare. Community service activities are divided into three stages, namely preparation, implementation of activities on site, and evaluation. KKN educates students to continuously improve and maintain cooperation and a high level of social awareness to realize a work program that will be achieved. From this, students can increase their insight and experience that the success and success of a work program implementation is highly determined and influenced by good collaboration between fellow group members, supervisors and the local community. In this case we have proven that with good cooperation our work programs can be completed as expected.

Kajian Pengaruh Nanopartikel Magnetik Fe3O4 Pada Deteksi Biosensor Berbasis Surface Plasmon Resonance (SPR) Yuan Alfinsyah Sihombing; Kamsul Abraha
Jurnal Ilmu Fisika Vol 9 No 2 (2017): September 2017
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.9.2.121-131.2017

Telah dilakukan kajian berkaitan dengan pengaruh nanopartikel Fe3O4 pada deteksi biosensor berbasisÂ surface plasmon resonance (SPR). Penelitian ini bertujuan untuk melihat penyebab munculnya dip baru atau pergeseran dip ke arah kanan pada kurva ATR (AttenuatedTotalReï¬‚ection) setelah adanya penambahan nanopartikel magnetik Fe3O4.Sifat magnetik nanopartikel berupa permeabilitas magnet disubstitusikan pada kurva ATR dan sudut SPR terbentuk pada sudut 51,8Âº; 47,3Âº; 46,0Âº dan 45,6Âº untuk ketebalan perak 10 nm, 20 nm, 30 nm dan 40 nm berturut-turut dengan ketebalan nanopartikel 10 nm.Untuk melihat pengaruh permeabilitas magnet, diplot kurva ATR tanpa permeabilitas magnet. Hasilnya menunjukkan bahwa sudut SPR terbentuk pada sudut yang sama. Sehingga kemunculan dip baru pada panjang gelombang sinar laser 632,8 nm bukan dikarenakan sifat magnetnya. Sifat magnet ini akan muncul pada rentang gelombang mikro. Dengan pendekatan Teori Medium Efektif (TME) Landauer dan Bruggeman untuk sistem empat lapisan prisma/perak/komposit (nanopartikel+udara)/udara, diperoleh kurva relasi dispersi surface plasmon pada angka gelombang ; ;; Â dan Â untuk variasi fraksi volume Â 0,1; 0,2; 0,3; 0,4 dan 0,5 berturut-turut mengalami kopling dengan gelombang evanescent. Ini menunjukkan bahwa pergeseran dip muncul dengan pendekatan teori medium efektif Landauer dan Bruggeman.Â Kata Kunci : Surface Plasmon Resonance (SPR), nanopartikel magnetik Fe3O4,Evanescent, , TME Landauer dan Bruggeman.

Calculating InN/GaN Transmission Coefficient from Single Barrier to Five Barriers with Propagation Matrix and Transfer Matrix Methods Ishmah Ulya; Russell Ong; Yuan Alfinsyah Sihombing
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.5, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v5i2.28549

In this study, the value of transmission coefficient on InN/GaN semiconductor from a single barrier to five barriers was determined by using the propagation matrix method and the transfer matrix method. This study aims to see the effect of adding a barrier to the number of resonance tunneling that occurs, to see the difference in transmission coefficient values which was obtained with the two methods, and to determine the effectiveness of the program execution process time from the propagation matrix and transfer matrix methods using Matlab programming. The results obtained indicated that the value of the transmission coefficient obtained from the two methods was the same. As the number of barriers increases, the number of resonance tunneling that occurs will increase. These two matrix methods had differences in terms of the effectiveness of the program execution process time and calculation process. The propagation matrix method was considered more effective than the transfer matrix method.

Peningkatan Kemampuan Peternak dalam Pemanfaatan Ampas Tahu sebagai Pakan Ternak Kambing Melalui Proses Fermentasi Aspergillus niger dan Rhizopus oryzae di Desa Deli Tua Kecamatan Namorambe Kabupaten Deli Serdang Yuan Alfinsyah Sihombing; Muhammad Zulham Efendi Sinaga; Rini Hardiyanti
Engagement: Jurnal Pengabdian Kepada Masyarakat Vol 4 No 2 (2020): November 2020
Publisher : Asosiasi Dosen Pengembang Masyarajat (ADPEMAS) Forum Komunikasi Dosen Peneliti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/engagement.v4i2.301

The feed is the main ingredient in livestock breeding. The selection of good feed will increase livestock productivity. Many feeds can be made from waste such as tofu residue. Tofu residue is agro-industrial waste from tofu making process. The feed for goats/sheep provided by breeders in Deli Tua Village, Namorambe district, Deli Serdang regency, dominantly utilizes green grass. So it is necessary to make the alternative animal feed based on tofu residue by adding microorganisms such as Aspergillus niger and Rhizopus oryzae in the fermentation process. This community service applied the Participatory Action Research (PAR) method. The results show that the community members have succeeded in making fermented feed. The program not only increases the member’s skills but also livestock productivity both in terms of quality and quantity

Detection and Extraction of Aroma Characteristics of Fuel Oil Using Gas Sensors Through Electronic-Nose System Sihombing, yuan alfinsyah; Herlambang, Muhammad Dennis
Journal of Technomaterial Physics Vol. 4 No. 2 (2022): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v4i2.9440

Fuel oil is an indispensable strategic source of energy for the fuel of vehicles and other engines. This study aims to detect and differentiate fuel oil using an electronic-nose system. The fuel oil used is Pertalite, Pertamax, and Pertamax Turbo. Four gas sensors are used, namely MQ 4, MQ 7, MQ 9, and MQ 136. The average output voltage values of Pertalite, Pertamax, and Pertamax Turbo fuel oil for MQ 4 sensors are 1.07 V, 1.22 V, and 0.96 V. For MQ 7 sensors, the output voltage values of the samples are 1.44 V, 1.43 V, and 1.37 V, respectively. For the MQ 9 gas sensor, the sample output voltage values are 1.23 V, 1.43 V, and 1.09 V. As for the MQ 136 gas sensor, the output voltage value of each oil is 1.26 V, 1.25 V, and 0.91 V. Sensors that provide the highest response in each sample are MQ 136 sensors. The electronic-nose system can extract characteristics from all three samples using the principal component analysis (PCA) method.

Fostering quranic literacy and promoting reading habits: the role of quranic reading house in pasi village, Berampu District, Dairi Regency Sihombing, yuan alfinsyah
Journal of Saintech Transfer Vol. 8 No. 1 (2025): Journal of Saintech Transfer
Publisher : Talenta Publisher Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jst.v8i1.17148

Pasi Village, located in Berampu District, Dairi Regency, North Sumatra Province, covers an area of 12.50 km², accounting for approximately 30.60% of the total regency area. Although the majority of its population is Muslim, both the proficiency in reading the Qur’an and the general reading culture among the community remain relatively low. The only reading facility available, the Arke Menjaha Reading House—established by the local mosque congregation—faces limited resources and low community engagement. This community service initiative aims to foster reading interest, particularly among children, and to improve the ability to read the Qur’an accurately. To achieve these objectives, a Participatory Action Research (PAR) approach was implemented through three stages: problem identification via collaborative discussions, program implementation involving literacy development and Qur’anic reading training, and impact evaluation. Interventions included expanding the book collection, providing illustrated reading materials, and applying the talaqqi tahsinul Qur’an method. The results indicated a 70% increase in reading house visitors (ages 6–15), and participant attendance in the Qur’anic reading sessions reached 75–100% across 6 of the 8 planned meetings. This initiative is expected to support the sustainability of learning and encourage the spread of Qur’anic reading skills among village children.

Effect of Varying Chitosan Molecular Weights on the Morphology and Physical Characteristics of PVA/Chitosan Composite Hydrogels Sihombing, Yuan Alfinsyah; Luthfianti, Halida Rahmi; Waresindo, William Xaveriano; Rodhiyah, Marathur; Nafisah, Nur’aini; Hapidin, Dian Ahmad; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Makara Journal of Science Vol. 29, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

We employed the innovative freeze–thaw method to investigate the effect of chitosan (CS) molecular weights incorporated into polyvinyl alcohol on the morphology and physical characteristics of the hydrogel. This study aimed to unravel the intricate relationships between CS molecular weight variations, CS concentration, and the number of freeze–thaw cycles (4 or 6 cycles) on hydrogel swelling degree and weight loss. Incorporating CS improved the hydrogel structure and enhanced its porosity, resulting in remarkable increases in swelling degree ranging from 2 to 6 times the initial weight. Higher molecular weight CS (310,000–375,000 Da) exhibited a lower swelling degree than medium molecular weight CS (190,000–310,000 Da), attributed to its ability to prevent crystal formation during the freeze–thaw process. Increased freeze–thaw cycles led to a decreased swelling degree, which indicated enhanced rigidity and stability due to more significant hydrogen bond formation with hydroxyl groups. Higher CS content amplified hydrogel weight loss, and additional cycles accentuated this effect, highlighting the challenge of maintaining an effective gel structure. CS with medium molecular weight emerged as the more suitable choice for applications demanding superior water absorption.

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