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Optimasi Serat Selulosa Asetat/Gelatin/Ekstrak Bajakah (Spatholobus littoralis Hassk) menggunakan Pemintalan Elektrik (Electrospinning) Kusumah, Fuji Hernawati; Hartati, Sri; Aramel, Aramel; Noviyanto, Alvian; Zulfi, Akmal; Rochman, Nurul Taufiqu; Khairurrijal, Khairurrijal
Phi: Jurnal Pendidikan Fisika dan Terapan Vol 8, No 2 (2022)
Publisher : Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/p-jpft.v8i2.15760

Pemintalan elektrik (electrospinning) merupakan metode produksi serat yang efektif dan efisien, yang dapat menggunakan berbagai jenis material dan dimanfaatkan untuk beragam aplikasi, salah satunya sebagai media penghantar. Bajakah (Spatholobus littoralis Hassk) merupakan tanaman asli Indonesia yang tinggi akan zat antioksidan dan anti inflamasi. Pada penelitian ini, ekstrak etanolik bajakah diinkorporasikan ke dalam serat selulosa asetat (SA)/gelatin dengan memvariasikan perbandingan volume larutan polimer (SA/gelatin) terhadap larutan ekstrak bajakah (8:1, 6:1, 4:1, dan 2:1). Berdasarkan hasil electrospinning diperoleh bahwa hanya larutan prekursor SA/gelatin 2:1 yang tidak dapat menghasilkan serat. Hasil analisis data karakterisasi SEM menunjukkan bahwa larutan prekursor SA/gelatin dan SA/gelatin/bajakah 8:1, 6:1, 4:1 berturut-turut menghasilkan serat dengan ukuran rata-rata sebesar 1548, 1509, 1377, dan 1079 nm. Uji kadar ekstrak bajakah menggunakan UV-Vis menunjukkan bahwa ekstrak bajakah berhasil diinkorporasikan dalam serat SA/gelatin.

Pengembangan Buku Ajar Berbasis Model Project Based Learning dalam Mata Kuliah Pengembangan Kurikulum PAI di STAIN Mandailing Natal Khairurrijal, Khairurrijal; Pratami, Fuji; Pohan, Ali Jusri; Lubis, Willy Akmansyah
at-Tarbiyah al-Mustamirrah: Jurnal Pendidikan Islam Vol 5, No 2 (2024)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31958/atjpi.v5i2.13619

Penelitian ini dilatarbelakangi oleh kebutuhan mahasiswa akan buku ajar mata kuliah pengembangan kurikulum PAI yang singkron dengan Rencana Pembelajaran Semester (RPS), karena belum adanya buku ajar berbasis project based learning yang dikembangkan untuk mata kuliah pengembangan kurikulum PAI. Oleh karena itu, penelitian ini perlu dilakukan untuk menggambarkan tentang pelaksanaan perkuliahan pengembangan kurikulum PAI sebelum dan sesudah ada buku ajar berbasis project based learning , untuk mengetahui validitas dan praktikalitas buku ajar. Metode penelitian yang digunakan adalah Reaserc And Developman (RnD) dengan model ADDIE yang menggunakan 5 tahapan yaitu Analysis-Design-Develop-Implement-Evaluate. Penelitian ini dilakukan sampai pada tahap praktikalitas. Sumber data yang digunakan adalah validitas, praktikalitas, wawancara dan dokumentasi. Teknis analisis data pada penelitian ini adalah dengan melakukan analisis kebutuhan, analisis validasi, dan praktikalitas. Hasil penelitian menunjukan bahwa pada proses perkuliahan pengembangan kurikulum PAI mahasiswa membutuhkan buku ajar yang singkron dengan RPS. Setelah adanya buku ajar mahasiswa dapat terbantu memahami materi dan dosen terbantu dalam menarik minat belajar mahasiswa untuk belajar mandiri . Hasil validasi RPS Mata Kuliah Pengembangan Kurikulum PAI tergolong sangat valid dengan persentase 92,22 %. Hasil validasi Buku Ajar Pengembangan Kurikulum PAI Berbasis Proyek tergolong sangat valid dengan persentase 88,85 %. Berdasarkan pengisian angket respon 2 orang dosen adalah sangat praktis dengan perolehan skor rata-rata 87 %. Hasil pengisian angket respon dari 53 orang mahasasiswa semester V Prodi Pendidikan Agama Islam terhadap kepraktisan produk buku ajar Pengembangan Kurikulum PAI Berbasis Proyek yang digunakan adalah sangat praktis dengan perolehan skor rata-rata 85,17 %. Kata Kunci: Buku Ajar, Project Based Learning, Kurikulum, PAI

Pengembangan Buku Ajar Berbasis Model Project Based Learning dalam Mata Kuliah Pengembangan Kurikulum PAI di STAIN Mandailing Natal Khairurrijal, Khairurrijal; Pratami, Fuji; Pohan, Ali Jusri; Lubis, Willy Akmansyah
at-Tarbiyah al-Mustamirrah: Jurnal Pendidikan Islam Vol 5, No 2 (2024)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31958/atjpi.v5i2.13619

Penelitian ini dilatarbelakangi oleh kebutuhan mahasiswa akan buku ajar mata kuliah pengembangan kurikulum PAI yang singkron dengan Rencana Pembelajaran Semester (RPS), karena belum adanya buku ajar berbasis project based learning yang dikembangkan untuk mata kuliah pengembangan kurikulum PAI. Oleh karena itu, penelitian ini perlu dilakukan untuk menggambarkan tentang pelaksanaan perkuliahan pengembangan kurikulum PAI sebelum dan sesudah ada buku ajar berbasis project based learning , untuk mengetahui validitas dan praktikalitas buku ajar. Metode penelitian yang digunakan adalah Reaserc And Developman (RnD) dengan model ADDIE yang menggunakan 5 tahapan yaitu Analysis-Design-Develop-Implement-Evaluate. Penelitian ini dilakukan sampai pada tahap praktikalitas. Sumber data yang digunakan adalah validitas, praktikalitas, wawancara dan dokumentasi. Teknis analisis data pada penelitian ini adalah dengan melakukan analisis kebutuhan, analisis validasi, dan praktikalitas. Hasil penelitian menunjukan bahwa pada proses perkuliahan pengembangan kurikulum PAI mahasiswa membutuhkan buku ajar yang singkron dengan RPS. Setelah adanya buku ajar mahasiswa dapat terbantu memahami materi dan dosen terbantu dalam menarik minat belajar mahasiswa untuk belajar mandiri . Hasil validasi RPS Mata Kuliah Pengembangan Kurikulum PAI tergolong sangat valid dengan persentase 92,22 %. Hasil validasi Buku Ajar Pengembangan Kurikulum PAI Berbasis Proyek tergolong sangat valid dengan persentase 88,85 %. Berdasarkan pengisian angket respon 2 orang dosen adalah sangat praktis dengan perolehan skor rata-rata 87 %. Hasil pengisian angket respon dari 53 orang mahasasiswa semester V Prodi Pendidikan Agama Islam terhadap kepraktisan produk buku ajar Pengembangan Kurikulum PAI Berbasis Proyek yang digunakan adalah sangat praktis dengan perolehan skor rata-rata 85,17 %. Kata Kunci: Buku Ajar, Project Based Learning, Kurikulum, PAI

Temperature Effects on Quantum Ballistic Transport in Double-Gate MOSFETs Using Landauer"“BÃ¼ttiker Formalism Sangian, Messiah Charity; Syuhada, Ibnu; Khairurrijal, Khairurrijal; Noor, Fatimah Arofiati
POSITRON Vol 15, No 1 (2025): Vol. 15 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i1.83947

This paper presents the development and application of a simulator utilizing the Landauer"“BÃ¼ttiker formalism to model quantum ballistic transport in double-gate (DG) metal-oxide-semiconductor field-efffect transistors (MOSFETs), focusing on temperature variations from 0.9 K to 300 K. The simulator employs advanced modelling techniques, including the exponential decay model, quantum interference model, and the Wentzel"“Krames"“Brillouin (WKB) approximation for transmission probability. Additionally, it incorporates the Landauer"“BÃ¼ttiker approach for current calculation and the gradual channel approximation (GCA) model for device operation. By leveraging these techniques, the simulator provides comprehensive insights into the quantum mechanical effects that influence device performance under various thermal conditions. This research underscores the critical role of temperature variations in the design and optimization of DG MOSFETs, emphasizing the necessity of effective thermal management and a thorough understanding of quantum effects to enhance the performance and reliability of nanoscale transistor technologies. These findings highlight the importance of incorporating temperature-dependent quantum mechanical considerations in advancing future nanoelectronic devices.

Synthesis and Characterization of Electrospun Edible Bird’s Nest/Polyvinylpyrrolidone Nanofibers Hapidin, Dian Ahmad; Priyanto, Aan; Eka Sentia Ayu Listari; Dhewa Edikresnha; Khairurrijal, Khairurrijal
Greensusmater Vol. 2 No. 1 (2025)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2025.2.1.21-29

Edible Bird's nest (EBN) is a highly valuable food product due to its rich nutritional content and potential health benefits. In this study, we investigated the morphology and diameter of electrospun EBN/PVP nanofibers by exploring different solution and electrospinning parameters. Smooth, homogeneous, and defect-free nanofibers were obtained using EBN:PVP ratios ranging from 10:90 to 60:40. Increasing the concentration of EBN in the solution resulted in fibers with larger diameters. The fiber diameter was found to decrease with increasing voltage of the electrospinning process. In addition, increasing the needle-to-collector distance resulted in fibers with smaller diameters. The FTIR spectrum of EBN/PVP showed a combination of the spectral characteristics of both components. The EBN/PVP nanofiber blend showed improved thermal stability, probably due to the interaction between EBN and PVP, which strengthened the blend structure. EBN/PVP nanofibers with dominant EBN content can be very useful as a matrix to protect bioactive ingredients from environmental degradation while allowing controlled release.

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.

Peningkatan Karakter dan Minat Peserta Didik di SMA Negeri 1 Panyabungan Utara Khairurrijal, Khairurrijal; Hasibuan, Maryam Hasim; Lubis, Nur Hamidah; Nasution, Nur Saidah; Nst, Rizky Sholatiah Yasin
Jurnal Pengabdian Sosial Vol. 1 No. 7 (2024): Mei
Publisher : PT. Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/c88hwj06

Apel pagi merupakan salah satu kegiatan yang mengerakan sikap kedisiplinan bagi siswa sebelum kegiatan belajar mengajar dimulai. Tujuan dari diadakannya kegiatan apel pagi yaitu untuk meningkatkan karakter dan minat peserta didik, karakter sebagai kehidupan dengan melakukan tindakan-tindakan yang berhubungan dengan diri seseorang dan orang lain. Sedangkan minat minat diartikan sebagai keadaan psikologi seseorang yang melibatkan erhatian yang terfokus, meningkatnya fungsi kognitif, kegigihan, dan keterlibatan sikap atau afektif. Kegaitan apel dilakukan di SMA 1 Negeri Panyabungan Utara setiap paginya. Sebelum pelaksanaan apel pagi, peserta didik terlebih dahulu ditertibkan untuk membentuk barisan di lapangan utama sekolah menurut kelasnya masing-masing agar memudahkan untuk mencek kehadiran peserta didik. Pelaksanaan apel pagi diberikan kewajiban kepada peserta didik untuk mengisi setiap acara sebagai sarana penyampaian informasi dan pengembangan kreativitas peserta didik. Hasil yang didapatkan dari kegiatan apel pagi yaitu adanya kesadaran peserta didik terhadap karakter serta meningkatnya minat belajar peserta didik melalui motivasi-motivasi yang diberikan.

Cross-linking formation of taro starch (colocasia esculenta)-based hydrogel using freeze-thaw method: synthesis and physical characterization Luthfianti, Halida Rahmi; Nafisah, Nuraini; Waresindo, William Xaveriano; Sawitri, Asti; Hapidin, Dian Ahmad; Noor, Fatimah Arofiati; Elfahmi, Elfahmi; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Greensusmater Vol. 2 No. 2 (2025)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2025.2.2.36-48

This study successfully made starch from taro tuber flour using immersion methods (AQ, SM) and centrifugation methods (CE). Taro starch with the AQ method produced the most starch content, thus improving the viscosity parameter in the pasting properties test. A simple mathematical model was used to control the taro starch pasting process and product. The highest R-value in the AQ sample was 309.88 s, indicating the strongest starch granule resistance. Meanwhile, the S-value in this study showed that all samples were above 1, which indicated that water penetration affected the swelling rate of starch granules. Taro starch with different isolation methods was analyzed for hydrogel formation using optical microscopy, SEM, swelling degree test, weight loss, color analysis, and texture profile analysis (TPA). The morphological images show three phases of a taro starch hydrogel formation: granular, potential cross-linking, and cross-linking hydrogel with a firm structure. Optimization of freeze-thaw process parameters was carried out to determine the optimum parameters of starch hydrogel formation, which was obtained under freezing conditions for 17 hours at -23°C and thawing for 7 hours at 4°C. The sample CE resulted in the most stable hydrogel formation, showing the highest amylose content, protein content, and the lowest impurities or ash content. The CE starch concentration of 10% resulted in the highest swelling degree and the lowest weight loss, indicating that the ability of the hydrogel to maintain its structure was stronger and more elastic. The textural properties of CE hydrogel at a concentration of 10% showed the most stability. It had the highest hardness, fracturability, chewiness, and springiness. Physical characteristics showed that the starch hydrogels had a dense, porous surface and formed a cross-linking structure. It can potentially be used in functional food applications to control the release of bioactive compounds.

PERANAN AUDIT INTERNAL DALAM MENUNJANG EFISIENSI DAN EFEKTIVITAS PENGENDALIAN INTERNAL PADA SISTEM PENGGAJIAN PT ILLUMINATI METAMORPHOSIS Azzahra, Asya; Alyah R, A. Fadilah; Khairurrijal, Khairurrijal; Ramadhani, Dwi Zahra; Ramadhani, Misliyatul
JURNAL LENTERA AKUNTANSI Vol. 10 No. 2 (2025): JURNAL LENTERA AKUNTANSI, November 2025
Publisher : POLITEKNIK LP3I JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34127/jrakt.v10i2.1927

The payroll system is one of the processes most vulnerable to errors and fraud, making effective internal control and the role of internal audit essential to ensure accuracy, transparency, and accountability. This study aims to analyze the role of internal audit in supporting the efficiency and effectiveness of internal control within the payroll system of PT Illuminati Metamorphosis. A descriptive qualitative approach was employed through interviews, observations, and documentation related to payroll procedures and internal monitoring mechanisms. The findings indicate that the implementation of internal audit at PT Illuminati Metamorphosis is not yet fully adequate due to the absence of formal written policies and procedures, as well as insufficient separation of duties. Although internal audit contributes to enhancing the efficiency and effectiveness of the payroll process, improvements are still required, particularly in documentation practices, segregation of duties, and the development of a digital payroll system to strengthen internal control.

Evaluating the Potential of Agarose Hydrogel Incorporating Eggshell Powder as a Sustainable Medium for Seedling Growth Nuryantini, Ade Yeti; Mahen, Ea Cahya Septia; Oktaviani, Indri; Nuryadin, Bebeh Wahid; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.376

Hydrogels represent a promising alternative for plant cultivation, offering excellent water and nutrient retention. This study reports the synthesis and characterization of an agarose-based hydrogel composite enhanced with eggshell powder (ESP). The hydrogel composites were prepared in four agarose-to-ESP ratios: 10:0 (Hyd-ES0), 10:1 (Hyd-ES1), 10:3 (Hyd-ES3), and 10:5 (Hyd-ES5). Fourier-transform infrared spectroscopy (FTIR) analysis revealed minimal peak shifts, indicating no significant chemical modifications. Characteristic ESP peaks were identified in the composite hydrogels, confirming the effective integration of ESP into the agarose matrix. The addition of ESP reduced the decomposition rate of the hydrogels and increased macromolecular stability. Density measurements indicated higher density with increasing ESP concentration, supported by enhanced crystal formation, as evidenced by more intense diffraction peaks in X-ray diffraction (XRD) patterns. Morphological analysis revealed that the porosity of the hydrogel, swelling, and weight-loss tests showed a decline in both properties with higher ESP content. Seed germination experiments demonstrated that stem, root, and leaf growth, as well as fresh and dry weights, were most optimal with the Hyd-ES1 hydrogel composite. Thus, Hyd-ES1 hydrogel exhibits significant potential as a medium for seed germination and plant growth.

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