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All Journal VALENSI Empowerment : Jurnal Pengabdian Masyarakat Spektra: Jurnal Fisika dan Aplikasinya Makara Journal of Science
Nurlaela, Ai
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Aerospace Engineering Chemistry Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics Social Sciences

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PELATIHAN OPERATOR CHAINSAW DAN TEKNIK PENEBANGAN DI PERUM PERHUTANI KESATUAN PEMANGKUAN HUTAN (KPH) TASIKMALAYA Hendrayana, Yayan; Adhya, Ilham; Supartono, Toto; Karyaningsih, Ika; Nurlaela, Ai
Empowerment : Jurnal Pengabdian Masyarakat Vol 3, No 02 (2020): Empowerment
Publisher : Program Studi Ilmu Hukum Fakultas Hukum Universitas Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25134/empowerment.v3i02.3470

Abstract

Logging activities at Perum Perhutani are one of the determinants of the quality of wood produced. Mistakes in felling and errors in dividing the stems will greatly affect the quality of the wood produced. Therefore it requires operator knowledge and skills in carrying out these activities. This activity was carried out at the Tasikmalaya KPH Urug TPK which is part of the Tasikmalaya Forest Management Unit (BKPH). The activity was carried out on September 1, 2020. The activity began with an in-room presentation of chainsaw, usage theory, and logging techniques which was continued with practice in the field. The community service activity undertaken is to offer solutions in the form of training activities for chainsaw operators and logging techniques. The hope is that by knowing the types and parts of chainsaws as well as the proper felling techniques for operatots in the field, forest harvesting activities will run properly and correctly with optimum results.Kegiatan penebangan di Perum Perhutani menjadi salah satu penentu kualitas kayu yang diproduksi. Kesalahan dalam penebangan serta kesalahan dalam pembagian batang akan sangat berpengaruh terhadap kualitas kayu yang dihasilkan. Oleh karena itu dibutuhkan pengetahuan dan keterampilan operator dalam melakukan kegiatan tersebut. Kegiatan ini dilakukan di TPK Urug  KPH Tasikmalaya yang termasuk pada Bagian Kesatuan Pemangkuan Hutan (BKPH) Tasikmalaya. Kegiatan dilaksanakan pada Tanggal 1 September 2020. Kegiatan diawali dengan pemaparan di dalam ruangan mengenai chainsaw, teori penggunaan, serta teknik penebangan yang dilanjutkan melakukan praktek di lapangan. Kegiatan pengabdian kepada  masyarakat yang dilakukan adalah menawarkan solusi berupa kegiatan pelatihan bagi operator chainsaw dan teknik penebangan. Harapannya adalah dengan mengetahui jenis dan bagaian-bagian chainsaw serta teknik penebangan yang tepat bagi para operatot di lapangan maka kegiatan pemanenan hutan akan berjalan dengan baik dan benar dengan hasil yang optimum.
SYNTHESIZE OF TiO2 NANOPARTICLES BY PLANETARY BALL MILL FOR DYE-SENSITIZED SOLAR CELLS (DSSC) PHOTOELECTRODE APPLICATION Nurlaela, Ai; Yuniarti, Elvan; Saptari, Siti Ahmiatri
Spektra: Jurnal Fisika dan Aplikasinya Vol 8 No 2 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 2, August 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.082.02

Abstract

In this study, the production of TiO2 nanoparticles from microcrystalline powder was accomplished using the high-energy ball milling (HEBM) technique. Three samples were milled for 0.5, 1, and 1.5 hours. The unmilled powder was also characterized as a comparison. The X-ray diffraction (XRD) technique was utilized to investigate the changes in the microstructure of the milled powders over time. The XRD curve of milled samples showed the broadening of the diffraction peaks, which indicates a decrease in particle size after the milling process. Using the Debye–Scherrer relation, obtain the particle size that decreased from 138.43 nm before milled to 76.65 nm after 0.5 hours milled, 90.63 nm after 1 hour milled, and 83.05 nm after 1.5 hours milled. XRD analysis also showed that TiO2 was in an anatase phase before and after milling. Furthermore, two samples of TiO2, unmilled and after 0.5 hours milled, were used as a working photoelectrode of DSSC with dye from mustard leaves. DSSC efficiency was measured with a 1000-watt halogen lamp. The efficiency of DSSC with photoelectrodes using TiO2 after 0.5 hours milled, which is 0.1715, was higher than using TiO2 before milled, which is 0,0987. The Large surface area in TiO2 enhances the efficiency of DSSC, indicating that the HEBM technique is quite suitable for producing these nanoparticles for this aim.
Synthesis and Characterization of Optical Properties of Carbon Quantum Dots (CQD) Based on Mustard Green (Brassica juncea L) Leaf with Urea Addition Yuniarti, Elvan; Nurlaela, Ai
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 2, November 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i2.34164

Abstract

Carbon quantum dots (CQDs) are a class of fluorescent carbon nanomaterials. Carbon quantum dots (CQDs) were synthesized in this work from Mustard Leaves (Brassica juncea L) with the Addition of Urea via a microwave-assisted reflux method. This research aims to characterize CQDs' optical properties, energy gap, and emission under UV light computationally and experimentally. The studied optical properties obtained the maximum absorption peak observed from the UV-Vis spectrum of CQDs without urea shown at 233 nm. The UV-Vis spectrum of CQDs with the addition of urea (1 g, 1.5 g, and 2 g urea) has maximum absorption peaks at 424 nm, 422 nm, and 418 nm. The addition of urea causes a shift in the peak of the UV-Vis absorption spectrum towards red wavelengths (redshift). CQDs display bright green emissions when exposed to UV irradiation. In this work, the structures of CQDs of various forms (CQD-24, CQD-54, CQD-24-NH2, CQD-54-NH2) are theoretically studied in detail, and the results present both models (CQD-24, CQD-54) shows that the calculation results are in accordance with the experimental results, namely having a maximum UV-Vis absorption at 233 nm and in the range 200-400 nm. The results of calculations based on experiments show the same trend, namely that with the addition of urea, there is a shift in the absorption peak (redshift). The gap energy obtained also decreased with the addition of urea. CQDs solution emits yellow-green light.
First-Principles Calculations of Thermoelectric Properties of Fe-Based Full- Heusler Fe2CuSi Nurlaela, Ai; Nanto, Dwi; Azhar, Anugrah; Yuniarti, Elvan; Kristiantoro, Tony; Dedi, Dedi
Makara Journal of Science
Publisher : UI Scholars Hub

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

Abstract

A first-principle study using density functional theory (DFT) and Boltzmann transport was conducted to evaluate the thermoelectric (TE) properties of an Fe-based full-Heusler alloy. The compound studied is Fe2CuSi with a Cu2MnAl-type structure. The electronic properties of Fe2CuSi were obtained using DFT calculations by running the Quantum ESPRESSO (QE) package. By contrast, TE properties, including electron thermal conductivity, electric conductivity, and Seebeck coefficient, were computed using a semi-empirical Boltzmann transport model solved through the BoltzTraP software at 50–1,500 K temperature range. The spin-orbit coupling effect on these properties was also evaluated, demonstrating notable effects on the results. Multiple electronic bands crossing the Fermi level for both spin directions were confirmed by the density of state curve, indicating the metallic behavior of Fe2CuSi. The magnitude of the figure of merit was determined by the Seebeck coefficient, electric conductivity, and electron thermal conductivity. In this study, the maximum dimensionless figure of merit was 0.027, reached at 1,000 K for the spin-down channel.
Co-Authors Azhar, Anugrah Dedi Dedi Dwi Nanto, Dwi Ika Karyaningsih Ilham Adhya Saptari, Siti Ahmiatri Supartono, Toto Tony Kristiantoro, Tony Yayan Hendrayana Yuniarti, Elvan