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All Journal Jurnal Penelitian Pendidikan PROSIDING SEMINAR KIMIA Jurnal Zarah JITK (Jurnal Ilmu Pengetahuan dan Komputer) Indonesian Journal of Chemistry Jambura Journal of Educational Chemistry Idealis : Indonesia Journal Information System Bivalen: Chemical Studies Journal International Journal of Social Science Kresna: Jurnal Riset dan Pengabdian Masyarakat Bulletin of Chemical Reaction Engineering & Catalysis al Kimiya : Jurnal Ilmu Kimia dan Terapan
Ratna Kusumawardani, Ratna
Jurusan Pendidikan Kimia Dan Ilmu Pengetahuan Alam, Fakultas Keguruan Dan Ilmu Pendidikan, ‎Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Medicine & Pharmacology Public Health Social Sciences Other

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Kinetic Study of Styrene Oxidation over Titania Catalyst Supported on Sulfonated Fish Bone-derived Carbon Ratna Kusumawardani; Mukhamad Nurhadi; Teguh Wirawan; Anton Prasetyo; Nabila Nur Agusti; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.13133.194-204

Abstract

The kinetic evaluation of titania supported sulfonated fish bone-derived carbon (TiO2/SFBC) as a catalyst in styrene oxidation by aqueous hydrogen peroxide was carried out. The catalysts were prepared by carbonation of fishbone powder at varying temperatures 500, 600 and 700 °C, respectively for 2 h, followed by sulfonation with sulfuric acid (1M) for 24 h and impregnated by varied titania concentration 500, 1000 and 1500 µmol. The physical properties of catalysts were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) and the nitrogen adsorption-desorption analysis. The catalytic activity result showed that TiO2/SFBC can be used as a potential catalyst in styrene oxidation. Worth noting that the sulfonation process has not only transformed the TiO2/FBC particulates (without sulfonation) to cuboid-shaped TiO2/SFBC (with sulfonation) but also contributed to the high selectivity of benzaldehyde. On the other hand, carbonization at different temperatures has an indistinct effect on catalytic performance due to their similar surface areas. The styrene conversion rate responded positively with the increasing amount of titania in the functionalized composites. The styrene oxidation by aqueous H2O2 unraveled the first-order reaction with the activation energy of ⁓63.5 kJ. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Carbon-containing Hydroxyapatite Obtained from Fish Bone as Low-cost Mesoporous Material for Methylene Blue Adsorption Mukhamad Nurhadi; Ratna Kusumawardani; Wirhanuddin Wirhanuddin; Rahmat Gunawan; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.5365.660-671

Abstract

The carbon-containing hydroxyapatite has been synthesized using the fish bone obtained from East Kalimantan, Indonesia. The synthesis was conducted at varying calcination temperature (300-700 °C) and duration time (1-5 h). The carbon-containing hydroxyapatite were characterized by using Nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Thermogravimetric analysis (TGA) and Differential thermal analysis (DTA). The carbon-containing hydroxyapatite nanoparticles consisted of the mesoporous structure with a specific surface area of 159 m2.g-1 and pore size of 44 Å. The carbon-containing hydroxyapatite nanoparticles were utilized as the adsorbent for the removal of methylene blue by varying the contact time, initial dye concentration, pH, adsorbent dosage and temperature. The maximum amount of adsorption capacity was 56.49 mg.g-1. The adsorption was well fitted with the Langmuir adsorption model (R2 ~ 0.998) and the pseudo-second-order model. This indicated that the dye molecules were adsorbed on the surface-active site of carbon-containing hydroxyapatite via chemical binding, forming an adsorbate monolayer. Hence, the adsorption capability corresponds to the physical properties such as the surface area and pore volume of hydroxyapatite because the larger surface area consists of higher binding sites for the adsorption. Thermodynamic parameters, including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS), indicated that the adsorption of methylene blue onto the carbon-containing hydroxyapatite nanoparticles was spontaneous. Thus, carbon-containing hydroxyapatite nanoparticles can be applied as a low-cost adsorbent for the treatment of industrial effluents that are contaminated with the methylene blue.  
Catalytic Performance of TiO2–Carbon Mesoporous-Derived from Fish Bones in Styrene Oxidation with Aqueous Hydrogen Peroxide as an Oxidant Mukhamad Nurhadi; Ratna Kusumawardani; Teguh Wirawan; Sumari Sumari; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 1 Year 2021 (March 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.1.9729.88-96

Abstract

The catalytic performance of titania-supported carbon mesoporous-derived from fish bones (TiO2/CFB) has been investigated in styrene oxidation with aqueous H2O2. The preparation steps of (TiO2/CFB) catalyst involved the carbonization of fish bones powder at 500 °C for 2 h. followed by impregnation of titania using titanium(IV) isopropoxide (500 µmol) precursor, and calcined at 350 °C for 3 h. The physical properties of the adsorbents were characterized using Fourier transform infrared, X-ray diffraction (XRD), Scanning electron microscopy with energy dispersive X-ray (SEM-EDX), and nitrogen adsorption-desorption studies. The catalytic test was carried out using styrene oxidation with H2O2 as an oxidant at room temperature for 24 h. Its catalytic activity was compared with Fe2O3/CFB, CuO/CFB, TiO2, and CFB catalysts. It is demonstrated that the catalytic activity of TiO2/CFB catalyst has the highest compared to Fe2O3/CFB, CuO/CFB, TiO2, and CFB catalysts in the oxidation of styrene with styrene conversion ~23% and benzaldehyde selectivity ~90%. Kinetics of TiO2/CFB catalyzed oxidation of styrene has been investigated and mechanism for oxidation of styrene has been proposed. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA   License (https://creativecommons.org/licenses/by-sa/4.0). 
Activated Bledug Kuwu’s Clay as Adsorbent Potential for Synthetic Dye Adsorption: Kinetic and Thermodynamic Studies Sri Lestari; Muflihah Muflihah; Ratna Kusumawardani; Mukhamad Nurhadi; Yuniati Mangesa; Fathur Insani Ridho; Robbiatul Adawiyah; Pristiningtyas Ambarwati; Siti Rahma; Sin Yuan Lai; Hadi Nur
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.12473.22-31

Abstract

Bledug Kuwu is one of the geological phenomena as a mud volcano that occurs in Kuwu, Purwodadi, Grobogan, Central Java, Indonesia. The evaluation of Bledug Kuwu’s clay as one of the adsorbents for synthetic dyes has been carried out. The preparation of the adsorbent started with washing the clay with distilled water, followed by activation with a solution of hydrochloric acid (1 M) under mechanistic stirring for overnight. The C−H and O−H groups found on the clay adsorbent could attract methylene blue by dispersion forces and hydrogen bonding. Hydrocloric acid activation process for clay can increase surface area from 49 to 70 m2.g−1, meanwhile, reducing the average crystal size from 48.3 to 43.4 nm. The dye removal capacity increased from 34 to 40 mg.g−1 in corresponding to the increase of the temperature from 30 to 50 °C. The results showed that the equilibrium adsorption capacity of activated Bledug Kuwu’s clay reached 99% in an adsorption time of 20 min. The kinetic models of methylene blue adsorption onto BKC and ABKC adsorbents follow the pseudo-second order and the adsorption process is spontaneous with free energy (ΔG) as −23.519 kJ.mol−1. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Synergistic Ti-Fe Oxides on Fishbone-Derived Carbon Sulfonate: Enhanced Styrene Oxidation Catalysis Mukhamad Nurhadi; Ratna Kusumawardani; Teguh Wirawan; Sin Yuan Lai; Hadi Nur
Indonesian Journal of Chemistry Vol 23, No 6 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.80667

Abstract

Fishbone-derived carbon sulfonate, modified through incipient wetness impregnation with titanium tetraisopropoxide and iron nitrate salts, displays catalytic activity in the oxidation of styrene with hydrogen peroxide (H2O2) as an oxidant. This was done to develop a cost-effective, non-toxic, and environmentally friendly bimetallic oxide catalyst, incorporating titanium and iron oxides on mesoporous-derived carbon fishbone to enhance styrene conversion and benzaldehyde selectivity in styrene oxidation using aqueous H2O2. The catalyst, featuring a combination of titanium and iron oxides on the surface of the fishbone-derived carbon sulfonate, demonstrates higher catalytic activity than single oxide catalysts, such as titanium or iron oxides alone. Factors influencing the catalyst's performance are investigated by using FTIR, XRD, XRF, SEM, and BET surface area. The results reveal that the presence of both titanium and iron oxides on the surface of the fishbone-derived carbon sulfonate and the catalyst's surface area creates a synergistic effect, the primary factors affecting its catalytic activity in styrene oxidation using H2O2 as an oxidant.
Effect of Preparation Acetone on Fish Bones Synthesized Through Sintering Method to Improve Hydroxyapatite Characteristics Ratna Kusumawardani; Atiek Rostika Noviyanti; Mukhamad Nurhadi; Akrajas Ali Umar
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 10, No 2 (2023): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v10i2.29422

Abstract

In the development of advanced materials and various technological applications, the preparation and sintering processes have become two important factors in determining material characteristics. This research focuses on two main aspects, namely the effect of fish bone preparation by soaking in acetone and the surface area of the material in the sintering process as part of the process of developing better materials. This research aims to determine the effect of soaking fish bone powder with acetone and the effect of the surface area of sintered fish bones to produce hydroxyapatite (HA). The immersion process with acetone is included in the sample preparation stage, while the sintering process is included in the material synthesis stage. These two things can affect the characteristics of the HA produced after analysis from the X-ray diffraction test. The HA structure obtained from all samples is hexagonal with cell parameter values a = b ≠ c and space group P 63 / m, where all samples have a value range of a = b = 9,42 Å and c = 6,88 Å. HA crystallinity was identified through the XRD peak at 2θ = 25,8 (002); 31,7 (211); 32,1 (112); 32,8 (300); 34,0 (202); 39,7 (310); 46,6 (222); 49,4 (213); 50,4 (321). The PAF-900 and CAF-900 samples are similar to HA in JCPDS 01-089-4405 whose compound formula is Ca5(PO4)3(OH) while the PWAF-900 sample is similar to HA in JCPDS 01-075-3727 whose compound formula is Ca5(PO4)3(CO3)0.01(OH)1.3. The percentage of crystallinity of PAF-900, CAF-900, and PWAF-900 respectively was 84,767; 73,506; and 71,962% with HA grain sizes of 0,8964; 0,6808, and 0,7398 nm. The HA density of PAF-900 and CAF-900 samples is 3,149 g/cm3 while PWAF-900 is 3,146 g/cm3. Based on this description, it can be concluded that the soaking preparation stage with acetone produces HA with the chemical formula Ca5(PO4)3OH with a higher percentage of crystallization and is denser compared to HA obtained without going through the soaking preparation stage with acetone. The sintering stage also plays an important role in increasing the crystallization percentage. The surface area of the material being sintered also influences the percentage of crystallization and the grain size of the resulting HA. Sintered fish bone powder produces a greater percentage of crystallization and grain size than fish bone chunks
Pelatihan Peningkatan Keterampilan Administrasi Menggunakan Microsoft Excel Pada Siswa-siswi SMK Triguna 1956 Kusumawardani, Ratna; Yulianawati; Mohammad Syafrullah; Purwanto, Purwanto; Jan Everhard
KRESNA: Jurnal Riset dan Pengabdian Masyarakat Vol 3 No 1 (2023): Jurnal KRESNA Mei 2023
Publisher : DRPM Universitas Budi Luhur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36080/kresna.v3i1.68

Abstract

Penerapan Microsoft Office sudah banyak dilakukan pada semua bidang, salah satunya bidang akademis dalam pengolahan data administrasi pada sebuah SMK namun tidak semua peserta didik menguasai dalam memanfaatkan Microsoft Excel. Institusi ini memiliki peran untuk mendidik para peserta didik yang siap untuk bekerja sesuai dengan skill yang dimilikinya dimana pada jaman sekarang amat sulit mencari sebuah pekerjaan jika tidak memiliki skill atau keterampilan. Untuk memumpuni hal tersebut, maka kami bekerjasama dengan SMK Triguna 1956 untuk melakukan pelatihan administasi bagi peserta didik menggunakan Microsoft Excel. Kegiatan ini bertujuan agar para peserta didik memiliki keterampilan dibidang teknologi khususnya dalam mengoperasikan Microsoft Excel sehingga dapat menjadi bekal untuk mencari pekerjaan. Pelatihan ini menerapkan metode praktikum dengan melib Penerapan Microsoft Office sudah banyak dilakukan pada semua bidang, salah satunya bidang akademis dalam pengolahan data administrasi pada sebuah SMK namun tidak semua peserta didik menguasai dalam memanfaatkan Microsoft Excel. Institusi ini memiliki peran untuk mendidik para peserta didik yang siap untuk bekerja sesuai dengan skill yang dimilikinya dimana pada jaman sekarang amat sulit mencari sebuah pekerjaan jika tidak memiliki skill atau keterampilan. Untuk memumpuni hal tersebut, maka kami bekerjasama dengan SMK Triguna 1956 untuk melakukan pelatihan administasi bagi peserta didik menggunakan Microsoft Excel. Kegiatan ini bertujuan agar para peserta didik memiliki keterampilan dibidang teknologi khususnya dalam mengoperasikan Microsoft Excel sehingga dapat menjadi bekal untuk mencari pekerjaan. Pelatihan ini menerapkan metode praktikum dengan melibatkan 30 orang peserta didik yang dilaksanakan di Laboratorium Komputer Universitas Budi Luhur Jakarta. Berdasarkan data kuesioner yang sudah diolah, menunjukan bahwa yang memahami materi pelatihan sebesar 92%. Diharapkan hasil kegiatan ini dapat menambah keterampilan atau skill para peserta didik untuk melamar pekerjaan usai tamat sekolah. atkan 30 orang peserta didik yang dilaksanakan di Laboratorium Komputer Universitas Budi Luhur Jakarta. Berdasarkan data kuesioner yang sudah diolah, menunjukan bahwa yang memahami materi pelatihan sebesar 92%. Diharapkan hasil kegiatan ini dapat menambah keterampilan atau skill para peserta didik untuk melamar pekerjaan usai tamat sekolah.
Penerapan Konsep Eco Enzyme dan Kerajinan Tangan dari Limbah Rumah Tangga Pada Kelurahan Pesanggrahan Kusumawardani, Ratna; Tutik Sri Susilowati; Triana Anggraini; Everhard, Jan; Samidi, Samidi; Abdullah, Indra Nugraha
KRESNA: Jurnal Riset dan Pengabdian Masyarakat Vol 4 No 1 (2024): Jurnal KRESNA Mei 2024
Publisher : DRPM Universitas Budi Luhur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36080/kresna.v4i1.105

Abstract

Setiap tahun volume sampah di Indonesia meningkat yang disebabkan oleh beberapa faktor yakni pertumbuhan populasi yang cepat, adanya urbanisasi dan konsumsi masyarakat tinggi. Hal tersebut menyebabkan produksi sampah organik dan anorganik melonjak namun tidak diiringi dengan wawasan masyarakat dalam memilih dan mengelola sampah tersebut. Berdasarkan permasalahan yang dipaparkan, maka peneliti menjalin kerjasama dengan Kelurahan Pesanggrahan sebagai mitra masyarakat guna mengedukasi dalam memanfaatkan sampah organik dengan konsep eco enzyme dan sampah anorganik dengan konsep kerajinan bak sampah yang berasal dari limbah rumah tangga. Sampah organik yang dapat didaur ulang dari limbah rumah tangga, salah satunya dari sisa makanan atau buah-buahan sedangkan sampah anorganik yang dapat dimanfaatkan dari limbah rumah tangga, salah satunya tutup botol sehingga dalam proses penguraian tersebut memakan waktu yang lama. Metode yang diterapkan pada pelatihan ini menggunakan metode ceramah guna menjelaskan dampak dari sampah organik dan anorganik dan praktek secara langsung dalam pemanfaatan limbah rumah tangga serta tanya jawab. Berdasarkan hasil kuesioner yang telah diolah setelah selesai pelatihan, menunjukkan sebanyak 90% masyarakat memperoleh wawasan baru terkait limbah organik yang dapat dijadikan pupuk organik dan 97% masyarakat memperoleh wawasan baru bahwa limbah anorganik yang dapat dijadikan kerajinan bak sampah sehingga masyarakat menghasilkan pendapatan tambahan dari produk ekonomis tersebut.
Persepsi siswa SMA tentang pembelajaran kimia menggunakan Google classroom Sukemi, Sukemi; Rindoi, Muhammad; Kusumawardani, Ratna; Watulingas, Maasje C.
Bivalen: Chemical Studies Journal Vol. 5 No. 1 (2022)
Publisher : Bachelor Degree Program of Chemical Education - Mulawarman University | Program Studi S-1 Pendidikan Kimia - Universitas Mulawarman

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

Abstract

Penelitian ini bertujuan untuk mengetahui persepsi siswa tentang pembelajaran kimia secara daring menggunakan Google classroom. Populasi dalam penelitian ini adalah 216 siswa kelas X IPA SMA N 2 Samarinda tahun ajaran 2020/2021. Sampel penelitian adalah 68 siswayang terdiri atas 20 laki-laki dan 48 perempuan yang dipilih secara acak. Penelitian ini menggunakan pendekatan kuantitatif dengan teknik pengumpulan data menggunakan angket. Persepsi siswa yang diukur adalah kemudahan akses, manfaat, komunikasi dan interaksi, pengiriman instuksi, dan kepuasan siswa. Hasil penelitian menunjukkan bahwa siswa memiliki persepsi positif tentang pembelajaran kimia secara daring menggunakan Google classroom. Penelitian ini mengindikasikan bahwa Google classroom merupakan solusi bagi guru, khususnya guru kimia, dalam melaksanakan pembelajaran daring.
Pengaruh Disiplin Belajar Terhadap Prestasi Belajar Kimia ‎Siswa Kelas X SMA Swasta di Samarinda Nurjanah, Siti; Kusumawardani, Ratna; Widiyowati, Iis Intan
Jambura Journal of Educational Chemistry Vol 3, No 1 (2021): February
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v3i1.8327

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh disiplin belajar terhadap prestasi belajar ‎kimia siswa kelas X SMA Swasta di Samarinda. Jenis penelitian ini adalah analisis deskriptif. ‎Populasi dalam penelitian ini adalah seluruh siswa kelas X SMA Swasta di Samarinda. Teknik ‎pengambilan sampel dilakukan dengan cara probability sampling dengan metode cluster ‎random sampling dan diperoleh sampel sebanyak 212 siswa. Berdasarkan hasil analisis data ‎secara deskriptif diperoleh skor rata-rata disiplin belajar siswa adalah 35,38 tergolong dalam ‎kategori sedang dan prestasi belajar kimia siswa adalah 34,91 tergolong dalam kategori sedang. ‎Dari hasil analisis regresi linier sedehana Y= a + bX, maka diperoleh persamaan regresinya Y= ‎‎38,707 + 0,601X, uji hipotesis uji t diperoleh signifikansi 0,000 < 0,05 menunjukkan bahwa ‎terdapat pengaruh positif disiplin belajar terhadap prestasi belajar kimia siswa. Adapun kontribusi ‎pengaruh disiplin belajar terhadap prestasi belajar kimia sebesar 12,4%. Berdasarkan hasil ‎penelitian menunjukkan bahwa terdapat pengaruh positif atau signifikan disiplin belajar ‎terhadap prestasi belajar kimia siswa kelas X SMA Swasta di Samarinda.‎
Co-Authors A. Rismawati Abdul Majid Abdul Majid Agus Harisandi Akrajas Ali Umar Akrajas Ali Umar Ana Fatimah Arma Ani Suryani Simbolon Anita Setiawati Anton Prasetyo Atiek Rostika Noviyanti Atiek Rostika Noviyanti Bayu Setiawan Darna Yunita Devi Listianingrum Devira Nur Ajizah Dini Yulia Sari Eka Parmawatika Fathur Insani Ridho Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Hadi Nur Ida Ayu Putu Sri Widnyani Iis Intan Widiyowati Indah Nur Fitriana Ivan Sebastian Jumaryadi, Yuwan Manalu, Hans Christian Marasi Hamonangan Maulina Maulina Mohammad Syafrullah muflihah muflihah Muhamad Hamami Nata Mukhamad Nurhadi Mukhamad Nurhadi Mukhamad Nurhadi, Mukhamad Nabila Nur Agusti Nugraha Abdullah, Indra Nurlaili, Nurlaili Pratiwi, Ajeng Hayu Pristiningtyas Ambarwati Purwanto Purwanto Putri Wulan Mayangsari Rahmat Gunawan Rexy Anderson Tindangen Ria Retnowati Ria Retnowati Rindoi, Muhammad Robbiatul Adawiyah Rony, Zahara Tussoleha Ruwirohi, Jan Everhard Samidi Samidi Serly Wahyuni Salosso Sin Yuan Lai Sin Yuan Lai Sin Yuan Lai Sin Yuan Lai Siti Nurjanah Siti Rahma Sri Lestari Sri Rahma Wati Suci Ramadani, Amanda Sukemi Sukemi Sumari Sumari Tamara Claudya Susanti Teguh Wirawan Teguh Wirawan Triana Anggraini Trisnandaru, Galih Muhammad Tutik Sri Susilowati Wa Rizka Hafinah Watulingas, Maasje C. Wirhanuddin Wirhanuddin Yulianawati Yuni Kurnia Yuniati Mangesa