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Wahyuningtyas, Irma
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The Influence of Chip Size Variation in the Pulping Process from Jabon Wood Dirna, Fitria Cita; Wahyuningtyas, Irma
Indonesian Journal of Chemical Research Vol 13 No 2 (2025): Edition for September 2025
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2025.13-fit

Abstract

Wood is the primary raw material in the pulp and paper industry. Due to its favorable fiber characteristics, Jabon wood (Anthocephalus cadamba Miq.) is a promising fast-growing pulp and paper production species. This study investigates the effect of nine different chip size variations, including their length and thickness (1×3, 3×3, 5×3, 1×5, 3×5, 5×5, 1×7, 3×7, and 5×7), on pulp yield, fiber properties, and chemical performance using the kraft pulping method. Parameters measured include pulp yield, fiber length, fiber diameter, lumen diameter, cell wall thickness, and derived indices such as Runkle ratio, felting power, Muhlsteph ratio, rigidity coefficient, flexibility ratio, and kappa number. Results show that chip size does not significantly affect yield but influences fiber quality and kappa number. Shorter and thinner chips improved chemical penetration, resulting in lower kappa numbers and higher-quality pulp. Fiber classification based on IAWA criteria placed jabon wood in class II, indicating medium to suitable suitability for pulp. The study provides novel insight into optimizing chip geometry for kraft pulping of jabon wood, which has rarely been explored in previous literature. These findings are relevant for enhancing raw material efficiency and pulp quality in industrial applications.
PENGUJIAN PERFORMA ALAT SPECTRONIC 20D+ DENGAN LARUTAN KALIUM PERMANGANAT (KMNO4) Ismail, Rohmat; Wahyuningtyas, Irma; Erlangga, Manasye; Prihatini, Esti
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.5992

Abstract

The Spectronic 20D+ is a simple spectophotometer that is still widely used in laboratories for both research and practicum activities. In order to ensure the continued accuracy of measurements, it is imperative that this instrument undergoes rigorous testing to ascertain its performance. The selection of potassium permanganate (KMnO4) as the testing solution is particularly salient in this context, given its notable advantages over conventional alternatives such as cobalt (II) chloride and potassium dichromate. These alternatives, while widely employed, are associated with a higher degree of risk and cost. The objective of this study is to ascertain the performance of the Spectronic 20D+ device when utilized with a KMnO4 solution. In this study, two units of Spectronic 20D+ were utilized, with one unit receiving a filter cleaning treatment only (PF), and the other undergoing a filter cleaning and replacement of the wolfram lamp (PFL). The maximum wavelength test yielded a value of 515 nanometers on both devices prior to the initiation of the repair process. The results of measuring the standard solution show that there is an increase in the amount of light absorbed, the slope of the line, and the coefficient of determination (R²). These were statistically tested with significantly different results on both tools after the repair process. This finding indicates that the measurement outcomes of the KMnO4 solution can serve as a reliable metric for evaluating the performance of the device before and after the repair process. Furthermore, following the restoration of the tool, the optimal linear range for KMnO4 concentration measurement was ascertained, ranging from 0 to 25 ppm. This determination was informed by the highest R2 value and the outcomes of cuvette correction testing, which yielded a consistent molar permissivity significance value as determined by the Duncan test for the five cuvettes utilized in this study.
STRATEGI CUSTOMER RELATIONSHIP MANAGEMENT (CRM) SEBAGAI KUNCI PENINGKATAN KEPUASAN KONSUMEN PADA INDUSTRI HASIL HUTAN KALIMANTAN TIMUR Nona, Risna; Wahyuningtyas, Irma; Rizki, Selvi Diliyanti; Badia, Bahdin Ahad
Journal Economics Technology And Entrepreneur Vol 4 No 03 (2025): ECOTECHNOPRENEUR : JOURNAL ECONOMICS, TECHNOLOGY AND ENTREPRENEUR
Publisher : Pusat Studi Ekonomi, Publikasi Ilmiah dan Pengembangan SDM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62668/ecotechnopreneur.v4i03.1810

Abstract

This study aims to prove and analyze the influence of Customer Relationship Management (CRM) as a key strategy on increasing Customer Satisfaction for forest products industry in East Kalimantan. This research employed a quantitative approach with a survey method, where primary data were collected by distributing questionnaires to 278 consumers selected using a simple random sampling technique. Data analysis was performed using the Structural Equation Modeling - Partial Least Square (SEM-PLS) approach with SmartPLS software. The results show that Customer Relationship Management (CRM) has a positive and statistically significant effect on Customer Satisfaction, as evidenced by a path coefficient of 0.249 and a T-statistic of 3.973 (P-value < 0.05). The R-Square value of 0.062 indicates that CRM is able to explain 6.2% of the variance in Customer Satisfaction. This finding confirms that the implementation of CRM strategies, particularly through ease of service access and the maintenance of personal relationships, is a crucial factor that can enhance consumer satisfaction in the forest products industry sector.
Pelatihan Pembuatan Pupuk Organik Cair dari Limbah Industri Daun Kayu Putih di Kelurahan Harapan Baru, Kecamatan Loa Janan Ilir, Samarinda Hertianti, Erina; Hernandi, M. Fikri; Wartomo, Wartomo; Prayitno, Joko; Salusu, Heriad Daud; Yusuf, Andi; Sari, Nur Maulida; Hanifah, Nisrina Putri; Wahyuningtyas, Irma; Kutana, Agung Nugrawan
Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat Vol. 5 No. 6 (2025): November 2025 - Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat
Publisher : Indonesian Scientific Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59395/altifani.v5i6.945

Abstract

Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan pengetahuan dan keterampilan kelompok PKK Dasawisma Lily 1 di Kelurahan Harapan Baru, Kota Samarinda, dalam memanfaatkan limbah daun kayu putih (Melaleuca leucadendra) menjadi pupuk organik cair. Limbah tersebut berasal dari industri penyulingan minyak atsiri PT Anugerah Bara Kaltim (ABK) dan selama ini belum dimanfaatkan secara optimal. Pelatihan dilakukan melalui sosialisasi, demonstrasi, dan praktik langsung pembuatan pupuk cair dengan metode fermentasi menggunakan bahan tambahan seperti air beras, air tebu, dan EM4. Hasil kegiatan menunjukkan peningkatan pemahaman peserta terhadap proses pengolahan limbah, kesadaran lingkungan, serta motivasi untuk mengembangkan inovasi berbasis limbah organik. Kegiatan ini menjadi model kolaborasi antara perguruan tinggi, industri, dan masyarakat dalam mewujudkan ekonomi sirkular dan pengelolaan limbah berkelanjutan.
The Effect of Synthetic and Commercial Nano-Magnetite on the Electromagnetic Absorbance Behavior of Magnetic Wood Rahayu, Istie Sekartining; Sabarna, Aqila Alya Nabila; Wahyuningtyas, Irma; Ismail, Rohmat; Prihatini, Esti; Darmawan, Wayan; Laksono, Gilang Dwi; Alipraja, Irsan
Jurnal Sylva Lestari Vol. 12 No. 2 (2024): May
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v12i2.889

Abstract

Magnetic wood with good electromagnetic wave absorption properties was prepared by comparing synthetic and commercial nano-magnetite (Fe3O4-NP) as sengon (Falcataria moluccana) wood impregnation solution. The co-precipitation method produced a synthetic nano-magnetite with NH4OH as a weak base precursor. Meanwhile, the commercial one was purchased from a supplier. Three levels of nano-magnetite concentration (1%, 2.5%, and 5%) were dispersed in deionized water. The impregnation process was done by applying a vacuum of 0.5 bar for 120 minutes, followed by a pressure of 1 bar for 120 minutes. The results showed that the commercial nano-magnetite caused more improvements in weight percent gain, density, and hardness than the synthetic nano-magnetic, although they were insignificantly different. There was also a reduction in brightness with the overall color change being categorized into other colors because the color became darker with increasing nano-magnetite concentration in both woods. The absorbance capacity of the synthetic nano-magnetite-treated wood was larger than the commercial nano-magnetite-treated wood. This synthetic nano-magnetite-treated wood had been optimally treated at a 5% concentration, making it suitable for use as electromagnetic wave shielding material because it can absorb almost 100% electromagnetic waves. Keywords: Fe3O4, impregnation, nano-magnetite, sengon wood, shielding materials
KEGIATAN PENANAMAN POHON DAN PEMBERSIHAN SUNGAI DI SUB-DAS KARANG MUMUS Denny, Shalehudin Denny Maruf; Yusuf, Andi; Wahyuningtyas, Irma; Kutana, Agung Nugrawan; Hanifah, Nisrina Putri; Dirna, Fitria Cita; Andika, Riki
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 6 No. 2 (2025): Volume 6 No. 2 Tahun 2025
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v6i2.40702

Abstract

Kegiatan pengabdian kepada masyarakat berupa penanaman pohon dan pembersihan sungai adalah upaya dalam melindungi kelestarian sumber daya air. Kegiatan ini dilaksanakan pada 31 Agustus 2024 dan bertempat di Sungai Karang Mumus, Kelurahan Lempake, Samarinda. Pelaksanaan kegiatan ini diawali dengan penanaman 100 bibit pohon dengan jenis yang berbeda dan dilanjutkan dengan pembersihan sampah plastik dan styrofoam. Kegiatan ini berlangsung dengan lancar dan menyebabkan dampak positif terhadap penghijauan Kembali wilayah bantaran Sungai Karang Mumus dan peningkatan kesadaran bagi Masyarakat di sekitarnya.
Sifat Anatomi dan Sifat Fisis Kayu Teras Maesopsis eminii Engl.: The Anatomical and Physical Properties of the Heartwood of Maesopsis eminii Engl. Dirna, Fitria Cita; Wahyuningtyas, Irma; Putri Hanifah, Nisrina
JURNAL HUTAN TROPIKA Vol 20 No 2 (2025): Volume 20 Nomor 2 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i2.22866

Abstract

The anatomical and physically characteristics of wood are fundamental characteristics required to determine the quality of a wood species. This study aims to obtain information about the anatomical structure of wood and the physical properties of African heartwood (Maesopsis eminii Engl.). In this study, macroscopic and microscopic observations of wood were carried out, including color, radius, fiber length, fiber diameter, lumen diameter, cell wall thickness, and pore diameter, as well as the derived values ​​of fiber dimensions (felting power, runkle ratio, flexibility ratio, coefficient rigidity, and muhlsteph ratio). In addition, the physical properties studied were water content, density, specific gravity, and wood dimensional shrinkage (longitudinal, radial, and tangential). The results showed that African heartwood has a dark yellow to brownish color and has round to oval pores that are predominantly solitary with a mixed arrangement. Based on the derived values ​​of its fiber dimensions, African heartwood fibers are classified into strength class II. The physical properties of African
The Effect of Size Factors on the Mechanical Strength of Meranti Wood Kutana, Agung Nugrawan; Wahyuningtyas, Irma; Salusu, Heriad Daud
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 6 No. 1 (2026): March 2026
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v6i1.330

Abstract

The use of wood as a construction material has been increasing in recent years. However, wood has limitations in terms of availability and size, which can affect the strength capacity of structural materials. Therefore, the efficient use of raw materials must be carefully considered in structural and construction planning. One important parameter related to this efficiency is the size factor of wood samples. The objective of this study was to analyze the effect of different sizes of meranti wood (Shorea spp.) used as structural elements on its mechanical properties, such as flexural properties (stiffness and strength) and compressive strength parallel to the grain. The results showed that both empirical observations and theoretical standards indicate a decrease in MOE values as the size of the test samples increases. Larger samples tend to produce lower MOR, bending strength, and compressive strength values. These findings indicate that the size factor plays an important role in determining the mechanical performance of wood and should be considered in structural design using wood materials.
Co-Authors Afandi, Irfan Ricky Denny, Shalehudin Denny Maruf Erlangga, Manasye Fathurrohman, Sewin Firman Noor Hasan Fitria Cita Dirna Hanifah, Nisrina Putri Hertianti, Erina I Wayan Darmawan Irsan ALIPRAJA Ismail, Rohmat Istie Rahayu JOKO PRAYITNO Khairunissa, Dhiya Khoerudin, Riki Kutana, Agung Nugrawan Laksono, Gilang Dwi Muhammad Fikri Hernandi Nona, Risna Prihatini, Esti Putri Hanifah, Nisrina Riadhi, Mohamad Rizki Riki Andika Rizki, Selvi Diliyanti Sabarna, Aqila Alya Nabila Salusu, Heriad Daud Saputri, Egydia Sari, Nur Maulida Trisna PRIADI Wartomo, Wartomo Yusuf, Andi