Article Per Year (5 Year)
p-Index From 2021 - 2026
0.961
P-Index
This Author published in this journals
All Journal Pendas : Jurnah Ilmiah Pendidikan Dasar Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam (JURRIMIPA) Journal of Multidisciplinary Science: MIKAILALSYS
Leni Aziyus Fitri
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Environmental Science Mathematics Physics Social Sciences Other

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 6 Documents
Search

 1 
Pengaruh Penambahan Aspal Buton pada Aspal Pen 60/70 terhadap Sifat Mekanik pada Lapisan Permukaan AC-WC Shilvhanie Usman; Yenni Darvina; Leni Aziyus Fitri; Fandi Oktasendra
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 1 (2026): April : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i1.8699

Abstract

This study aims to determine the effect of adding Buton Asphalt on the mechanical properties of Asphalt Concrete – Wearing Course (AC-WC) mixtures based on Marshall test parameters. The variations of asphalt content used were 0%, 2%, and 5%. Each variation was tested using the Marshall method to obtain the values of Stability, Flow, Void in Mix (VIM), Void in Mineral Aggregate (VMA), Void Filled with Asphalt (VFA), and Marshall Quotient (MQ). The results show that the addition of Buton Asphalt affects the improvement of the mixture characteristics. The highest stability value was obtained at 5% Buton Asphalt content, which was 1,074 kg, while the lowest flow value was also found at 5%, which was 2.48 mm, indicating that the mixture becomes stiffer and more stable. The VIM value decreased from 4.7% at 0% content to 4.2% at 5% content, indicating that the air voids in the mixture became smaller. The VMA value also decreased from 16.2% at 0%, 15.8% at 2%, and 15.1% at 5%, while the VFA value increased from 71% to 72.18%. The highest Marshall Quotient (MQ) value was obtained at 5% Buton Asphalt content, which was 433 kg/mm, indicating that the mixture has better stiffness and resistance to deformation. Based on these results, it can be concluded that the addition of 5% Buton Asphalt provides the best mixture characteristics for the AC-WC layer.
Pengaruh Variasi Ukuran Agregat dan Suhu Pencampuran terhadap Karakteristik Marshall Campuran Asphalt Concrete Wearing Course (AC-WC) Zira Artika; Yenni Darvina; Leni Aziyus Fitri; Fadhila Ulfa Jhora
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 1 (2026): April : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i1.8700

Abstract

The performance of asphalt mixtures is strongly influenced by the composition of their constituent materials, particularly aggregate size and mixing temperature during production. In many tropical and subtropical regions, asphalt pavements frequently experience rutting, reduced stability, and changes in viscoelastic properties due to high environmental temperatures and heavy traffic loads. These conditions can significantly affect pavement durability, making it essential to produce asphalt mixtures that meet established technical standards. This study aims to analyze the effect of variations in aggregate size distribution and mixing temperature on the Marshall characteristics of Asphalt Concrete Wearing Course (AC-WC) mixtures. The research employs the Marshall test method to evaluate the load-bearing capacity and stability of hot asphalt mixtures and to assess their compliance with ASTM/SNI standards. The results indicate that mixtures with standard aggregate gradation achieve stability values of 985 kg at 120°C, 1055 kg at 140°C, and 1107 kg at 160°C. As mixing temperature increases, flow values decrease, while the Marshall Quotient (MQ) increases, indicating improved stiffness. Higher temperatures also enhance compaction, reducing VIM and VMA while increasing VFA. Conversely, non-standard aggregate gradations result in several parameters failing to meet ASTM/SNI requirements, confirming that standard gradation produces superior asphalt performance.
Effect of Bioreductant–Precursor Ratio on the Physical Characteristics of Silver Nanoparticles Synthesized via Green Synthesis Using Lemongrass (Cymbopogon citratus) and Betel Leaf (Piper betle L.) Extracts Andini Khairi Alena; Riri Jonuarti; Leni Aziyus Fitri; Eka Susanti
Journal of Multidisciplinary Science: MIKAILALSYS Vol 4 No 3 (2026): Journal of Multidisciplinary Science: MIKAILALSYS
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/mikailalsys.v4i3.11560

Abstract

Green synthesis of silver nanoparticles (AgNPs) using plant extracts offers an environmentally sustainable alternative to conventional synthesis methods; however, the influence of the bioreductant-to-precursor ratio in dual-bioreductant systems on the physical characteristics of AgNPs remains insufficiently understood. This study aimed to determine the effect of different bioreductant-to-precursor ratios on the physical characteristics of AgNPs synthesized using combined lemongrass (Cymbopogon citratus) and betel leaf (Piper betle L.) extracts. AgNPs were synthesized at bioreductant-to-precursor ratios of 1:9, 2:8, and 3:7 and characterized using UV–Visible spectroscopy, X-ray diffraction (XRD), and particle size analysis (PSA). UV–Visible spectroscopy confirmed the formation of AgNPs through the appearance of surface plasmon resonance peaks across all ratio variations. The 1:9 ratio exhibited the strongest optical characteristics, with a maximum absorption wavelength of 423 nm and the highest absorbance value of 2.165. XRD analysis verified the formation of AgNPs with a face-centered cubic crystalline structure and average crystallite sizes ranging from 18.45 to 23.80 nm. PSA results showed hydrodynamic particle diameters ranging from 38.3 to 137.7 nm and polydispersity index values of 0.096–0.306. An integrated evaluation of the characterization results identified the 1:9 ratio as the optimum synthesis condition because it produced the best balance between smaller particle size and higher surface plasmon resonance intensity. Nevertheless, the 2:8 ratio yielded the most homogeneous particle size distribution, as indicated by the lowest polydispersity index. These findings demonstrate that the bioreductant-to-precursor ratio critically influences the optical, structural, and particle-size characteristics of AgNPs. This study contributes to the optimization of environmentally sustainable AgNP synthesis using complementary plant-derived bioreductants.
The Effect of Lemongrass Leaf and Betel Leaf Extract Ratio Variations on the Optical Characteristics and Crystal Structure of Silver Nanoparticles Synthesized via Green Synthesis Nirmala Rahima Suci; Riri Jonuarti; Leni Aziyus Fitri; Fandi Oktasendra
Journal of Multidisciplinary Science: MIKAILALSYS Vol 4 No 3 (2026): Journal of Multidisciplinary Science: MIKAILALSYS
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/mikailalsys.v4i3.11561

Abstract

Green synthesis of silver nanoparticles (AgNPs) provides an environmentally sustainable approach by utilizing plant-derived bioactive compounds as reducing and stabilizing agents. The combination of lemongrass (Cymbopogon citratus) and betel leaf (Piper betle L.) extracts may enhance AgNP formation because both contain flavonoids, phenolic compounds, citral, eugenol, and other secondary metabolites. This study aimed to investigate the effects of different lemongrass-to-betel leaf extract ratios on the physical characteristics of AgNPs synthesized through a green synthesis method. AgNPs were prepared using extract ratios of 1:1, 3:1, and 1:3 and characterized using UV–Visible spectroscopy, particle size analysis (PSA), and X-ray diffraction (XRD). UV–Visible spectroscopy confirmed AgNP formation through surface plasmon resonance absorption bands in all samples, with maximum wavelengths of 419, 444, and 398 nm and absorbance values of 1.98, 1.98, and 2.47 for the 1:1, 3:1, and 1:3 ratios, respectively. PSA showed average particle sizes of 39.1 ± 0.9 nm, 59.7 ± 16.1 nm, and 47.2 ± 4.6 nm, with the smallest particle size obtained at the 1:1 ratio. XRD analysis confirmed that all samples possessed a face-centered cubic crystalline structure, with average crystallite sizes of 16.72 nm for the 1:1 ratio, 14.72 nm for the 3:1 ratio, and 9.37 nm for the 1:3 ratio. These findings demonstrate that variations in the composition of the dual-bioreductant system influence the optical properties, particle size, and crystallite size of the synthesized AgNPs. The 1:1 ratio produced the smallest hydrodynamic particle size, whereas the 1:3 ratio yielded the highest absorbance and smallest crystallite size. This study contributes to the optimization of plant-mediated AgNP synthesis by demonstrating that the relative composition of lemongrass and betel leaf extracts is a critical parameter for controlling nanoparticle characteristics.
Sintesis dan Karakterisasi Nanomagnetik Fe3O4 Berbasis Pasir Besi Pantai Sunur melalui Metode Kopresipitasi Feby Eriza Tanjung; Rahmat Hidayat; Ratnawulan Ratnawulan; Leni Aziyus Fitri
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 2 (2026): Agustus : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i2.10055

Abstract

Iron sand is an abundant natural resource in coastal areas of Indonesia, including Sunur Beach, Padang Pariaman Regency, West Sumatra, which has great potential as an economical and environmentally friendly raw material for Fe₃O₄ nanoparticle synthesis. This study aims to synthesize and characterize Fe₃O₄ nanoparticles derived from Sunur Beach iron sand using the coprecipitation method. The synthesis process involved dissolving iron sand in 37% HCl, followed by precipitation using 25% NH₄OH, drying, and sintering at 400°C. The synthesized product was characterized using XRD, FTIR, and FESEM analyses. The XRD results showed a characteristic magnetite phase diffraction pattern with the main peak appearing at the (311) plane according to the ICDD standard 01-075-0449, with an average crystal size of 18.36 nm calculated using the Debye-Scherrer equation. FTIR analysis confirmed the presence of Fe₃O₄ functional groups at wavenumbers of 545.18, 490.81, and 432.32 cm⁻¹, representing the characteristic bonds of magnetite structures. FESEM observations revealed a rod-like particle morphology with an average diameter of 96.48 nm. These results confirm that Sunur Beach iron sand is a viable alternative raw material for nanoscale Fe₃O₄ nanoparticle synthesis.  
ANALISIS KONDISI AWAL KEMAMPUAN PEMECAHAN MASALAH SISWA PADA MATERI USAHA DAN ENERGI Anggi Dewira Putri; Festiyed; Desnita; Leni Aziyus Fitri
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 03 (2026): Volume 11 Nomer 03, September 2026 Publication
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i03.61328

Abstract

Problem-solving ability constitutes one of the fundamental competency’s students must possess to face the demands of twenty-first-century learning, particularly in physics, which requires not only conceptual mastery but also the capacity to analyze and resolve contextual problems systematically. This study aims to describe the initial condition of students' problem-solving ability on the topic of work and energy prior to any instructional intervention. A descriptive quantitative approach was employed, involving 26 grade-X students of SMAN 4 Pariaman as the try-out sample, together with structured interviews with three physics teachers as supporting data. The instrument consisted of a two-item essay test developed based on Polya's four problem-solving indicators: understanding the problem, devising a plan, carrying out the plan, and looking back. The results show that the average problem-solving ability reached only 28.26%, categorized as low. The indicator of understanding the problem attained the highest percentage (50%, moderate category), whereas devising a plan (22.12%), carrying out the plan (23.08%), and looking back (28.85%) remained in the low category. Interview results corroborate these findings, revealing that problem-solving-oriented assessment is rarely administered and that learning media remain limited to slides and videos. These findings indicate an urgent need for instructional innovation, such as the Problem Based Learning model supported by interactive web-based media, to systematically train students' problem-solving skills.
Co-Authors Andini Khairi Alena Anggi Dewira Putri Desnita Eka susanti Fadhila Ulfa Jhora Fandi Oktasendra Feby Eriza Tanjung Festiyed Nirmala Rahima Suci Rahmat Hidayat Ratnawulan . Riri Jonuarti Shilvhanie Usman Yenni Darvina Zira Artika