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All Journal JURNAL FISIKA SCHOOL EDUCATION JOURNAL PGSD FIP UNIMED Jurnal Fisika FLUX Science and Technology Indonesia JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) Jurnal Abdi Masyarakat Indonesia Automotive Experiences INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Jurnal AKAL: Abdimas dan Kearifan Lokal Petro : Jurnal Ilmiah Teknik Perminyakan JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) Wahana Fisika : Jurnal Fisika dan Terapannya
Cahaya Rosyidan, Cahaya
Universitas Trisakti
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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USE OF ANOVA STATISTICAL METHOD IN EVALUATION OF TOFU WASTEWATER USED FOR SPIRULINA CULTURE MEDIUM ENRICHED WITH UREA AND NaHCO3 Mustamina Maulani; Gabriella Jasmine; Rosmalia Dita Nugraheni; Maman Djumantara; Asri Nugrahanti; Bayu Satiyawira; Cahaya Rosyidan; Lisa Samura; Harin Widiyatni; Pauhesti Pauhesti
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 6, NUMBER 2, OCTOBER 2023
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v6i2.16933

Abstract

Indonesia has a large amount of liquid waste originating from the tofu industry. Currently, the treatment of tofu industrial wastewater is carried out using both anaerobic and aerobic methods, but both methods still have several weaknesses. In this study, the tofu industrial wastewater was utilized as a culture medium for Spirulina sp. to provide economic value from wastewater that can be used as bioethanol, pharmaceuticals, and food products rich in omega 3, chlorophyll, carotenoids. Aim: The growth of Spirulina sp. is closely related to the availability of macro and micronutrients as nutrients and the influence of environmental conditions, so this study was aimed to see the best variation of the addition of urea and NaHCO3 as additional nutrients to maximize growth and cell density of Spirulina sp. with tofu industrial wastewater media. Methodology and Results: This study was done by culvitating Spirulina sp in the growth media, measuring the Optical Density (OD), and analyzing quantitatively and using ANOVA on IBM SPSS Statistics version 20. The study indicated that adding urea and NaHCO3 to Spirulina sp. had no effect on cell density and growth rate. Treatment with addition of urea 0.36 g/500 ml without additional of NaHCO3 had the highest growth rate, 0.00852/day, and the highest cell density value on Spirulina sp. growth. Conclusion, significance, and impact study: The tofu liquid waste can be used as a new alternative used as fertilizer because in the liquid tofu waste, it provides the nutrients needed by Spirulina sp.
SUATU STUDI PEMODELAN VISKOELASTIK MATERIAL BENANG VIZ 100% WOOL 36 TEX MENGGUNAKAN PENDEKATAN FISIKA Valentinus Galih Vidia Putra; Andrian Wijayono; Irwan .; Tina Martina; Cahaya Rosyidan
Wahana Fisika Vol 4, No 1 (2019): June
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v4i1.15500

Abstract

Suatu model matematis viskoelastik untuk menentukan besar koefisien viskos serta koefisien elastik suatu benang tekstil telah dikaji pada penelitian ini. Suatu persamaan matematis benang tekstil viz. 100% wool yang memiliki nomor benang 36 tex atau 36 (g/km) telah dirumuskan menggunakan mekanika klasik. Hasil studi memperlihatkan bahwa pemodelan ini dapat digunakan untuk menentukan sifat viskoelastik material berdasarkan sifat stress relaxation.
USE OF ANOVA STATISTICAL METHOD IN EVALUATION OF TOFU WASTEWATER USED FOR SPIRULINA CULTURE MEDIUM ENRICHED WITH UREA AND NaHCO3 Mustamina Maulani; Gabriella Jasmine; Rosmalia Dita Nugraheni; Maman Djumantara; Asri Nugrahanti; Bayu Satiyawira; Cahaya Rosyidan; Lisa Samura; Harin Widiyatni; Pauhesti Pauhesti
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 6, NUMBER 2, OCTOBER 2023
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v6i2.16933

Abstract

Indonesia has a large amount of liquid waste originating from the tofu industry. Currently, the treatment of tofu industrial wastewater is carried out using both anaerobic and aerobic methods, but both methods still have several weaknesses. In this study, the tofu industrial wastewater was utilized as a culture medium for Spirulina sp. to provide economic value from wastewater that can be used as bioethanol, pharmaceuticals, and food products rich in omega 3, chlorophyll, carotenoids. Aim: The growth of Spirulina sp. is closely related to the availability of macro and micronutrients as nutrients and the influence of environmental conditions, so this study was aimed to see the best variation of the addition of urea and NaHCO3 as additional nutrients to maximize growth and cell density of Spirulina sp. with tofu industrial wastewater media. Methodology and Results: This study was done by culvitating Spirulina sp in the growth media, measuring the Optical Density (OD), and analyzing quantitatively and using ANOVA on IBM SPSS Statistics version 20. The study indicated that adding urea and NaHCO3 to Spirulina sp. had no effect on cell density and growth rate. Treatment with addition of urea 0.36 g/500 ml without additional of NaHCO3 had the highest growth rate, 0.00852/day, and the highest cell density value on Spirulina sp. growth. Conclusion, significance, and impact study: The tofu liquid waste can be used as a new alternative used as fertilizer because in the liquid tofu waste, it provides the nutrients needed by Spirulina sp.
Rotating-Magnetic-Field-Assisted Electrodeposition of Copper for Ambulance Medical Equipment Syamsuir, Syamsuir; Susetyo, Ferry Budhi; Soegijono, Bambang; Yudanto, Sigit Dwi; Basori, Basori; Ajiriyanto, Maman Kartaman; Edbert, Daniel; Situmorang, Evi Ulina Margaretha; Nanto, Dwi; Rosyidan, Cahaya
Automotive Experiences Vol 6 No 2 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9067

Abstract

This study examines the influence of the application of a rotating magnetic field in the electrodeposition of copper (Cu). During the electrodeposition, five constant magnets were rotated (500 and 800 rpm) towards the bottom of the sample. To investigate deposition rate, surface morphology, phase, structure, corrosion resistance, and hardness in deposited Cu using a weighing scale, a scanning electron microscope equipped with energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), potentiodynamic polarization, and hardness tester respectively. Bacterial activity was also evaluated through this research. Morphological surface observations showed that the increase in the rotational speed of the magnets during the electrodeposition process led to a smooth surface. A perfect Cu phase covers Al alloy with no oxide. The potentiodynamic polarization demonstrated by the increase in the rotating led to a shift to the more positive value of the corrosion potential. Moreover, the corrosion current also decreases with the increase in the rotating speed of the magnets. Less crystallite size promoted forming a higher hardness and inhibition zone of the Cu films.
Nickel Salt Dependency as Catalyst in the Plating Bath on the Film Properties of Cu/Cu-Ni Rosyidan, Cahaya; Kurniawan, Budhy; Soegijono, Bambang; Maulani, Mustamina; Samura, Lisa; Nababan, Frederik Gresia; Putra, Valentinus Galih Vidia; Susetyo, Ferry Budhi
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.529-538

Abstract

Metal plating frequently employs nickel (Ni) and copper (Cu) as anodes. Cu/ Cu-Ni film formed has many advantages, such as better corrosion resistance and high hardness characteristics. This study aims to assess the properties of Cu/Cu-Ni film, such as phase, surface morphology, crystallographic orientation, hardness, corrosion analysis, and contact angle, which were fabricated using electrodeposition with various Ni salt additions (0.3, 0.5 and 0.7 M). In addition, the cathode current efficiency (CCE) and deposition rate of the Cu/Cu-Ni electrodeposition were also investigated. An increase in Ni salt in the plating bath could enhance the pH, promoting higher CCE and depleting hydrogen evolution at the cathode, leading to the presenting Ni phase in the alloy. The higher concentration of Ni salt in the solution could also enhance the deposition rate due to a shift to a pH value, which affects the roughening of the surface morphology, promoting a higher contact angle. All crystal structures generated by Cu/Cu-Ni electrodeposition were FCC, with the preferred orientation of the (111) plane. Crystallite size and lattice strain depend on the deposition rate. Less crystallite size and lattice strain affect the film’s hardness and corrosion resistance. Moreover, the third bath had the resulting Cu-Ni layer with the best hardness and corrosion rate of around 136 HV and 0.081 mmpy.
Carbon Micron-size Content Dependency in Epoxy/Carbon Composite Coated onto SPCC Plate for Automotive Bodies Protection Anggrainy, Rani; Susetyo, Ferry Budhi; Lubi, Ahmad; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Soegijono, Bambang; Ajiriyanto, Maman Kartaman; Kurniawan, Ova; Nanto, Dwi
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.989-998

Abstract

Conventional epoxy coating for surface metal corrosion protection reported many unsolved technical problems. Adding filler in the epoxy could enhance the promising properties of the composite coating. Our work describes in detail the synthesizing and characterizing epoxy/carbon composite coating. Epoxy was mixed with thinner high gloss (HG) and hardener and stirred using a stirrer apparatus. After blending, various carbons were added (1 wt. %, 3 wt. %, and 5 wt. %) and then appropriately stirred. The different mixture composite was coated onto the steel plate cold rolled coiled (SPCC) plate using high-volume low-pressure (HVLP) in two passes. Various characterizations were performed, including crystallographic orientation, Infra-Red (IR)-spectra, surface morphology, thickness, hydrophobicity, hardness, and corrosion using X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), portable dry film coating thickness (DFT), digital camera, Vickers microhardness tester, and Potentiostat, respectively. More carbon micron-sized content led to elevate the peak intensity, surface bumpiness, and hydrophobicity. The uppermost external bumpiness and hydrophobicity values are 23.51 µm and 101◦. Hardness depends on carbon content and more carbon leads to an increase in the hardness of the composited coating. The highest average Vickers hardness value is 28.24 HV. The coating thickness influenced the corrosion rate, more coating thickness promoted lesser corrosion rate. The highest coating thickness (60.8 µm) promoted a corrosion rate of around 5.65×10−4 mmpy.
PEMANFAATAN KOMPOSIT NATURAL BENTONITE DAN AMPAS TEBU SEBAGAI PENJERNIH AIR LIMBAH INDUSTRI TAHU HARAPAN MAJU Samura, Lisa; Burhannudinnur, Muhammad; Prakoso, Suryo; Rosyidan, Cahaya; Putra, Raka Handika; Urbiyanto, Gemintang Atlantika; Auliya, Hilyah
Jurnal Abdi Masyarakat Indonesia (JAMIN) Vol 4 No 2 (2022): JURNAL ABDI MASYARAKAT INDONESIA (JAMIN)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jamin.v4i2.13440

Abstract

Industri tahu adalah industri yang didominasi oleh usaha-usaha skala kecil dengan modal yang terbatas dan tersebar di seluruh wilayah Indonesia. Salah satunya adalah industri tahu Harapan Maju (HS) di Cimanggis, Depok, Jawa Barat. Industri ini masih menggunakan cara tradisional dengan membuang limbah ke sungai. Jika langsung dibuang ke sungai, limbah tahu dapat mencemari lingkungan. Oleh      karena itu sebelum limbah dibuang, sebaiknya dijernihkan terlebih dahulu untuk menjaga lingkungan. Salah satu metode penjernihan adalah dengan menggunakan bentonit dan karbon aktif ampas tebu. Bentonit memiliki kemampuan untuk menyerap zat organik yang baik dan mengikat padatan yang relatif kecil dalam air. Sedangkan karbon aktif ampas tebu berfungsi sebagai penjernih dan menyerap logam berat pada air limbah. Proses yang terjadi adalah proses adsorpsi atau proses pemisahan zat padat         dari fluida dengan jalan melewatkan fluida melalui medium penyaring atau septum sehingga zat padat akan tertinggal pada medium. Teknologi sederhana ini sangat efektif bila diaplikasikan dalam pengolahan air limbah industri tahu. Sebelum pengujian nilai BOD 714 mg/L, TDS 1129 mg/L, COD 1152 mg/L dan pH air limbah adalah 4. Pengujian dengan menggunakan kombinasi ampas tebu dan bentonit pada sampel 2c yaitu ampas tebu 1 gr dan bentonit 0.1 gr memberikan hasil yang terbaik, dimana     nilai BOD 142,8 mg/L, TDS 407 mg/L, COD 195,84 mg/L dan pH 6 yang memenuhi standar Permen LH no.51 tahun 1995.
SOSIALISASI FLUIDA PEMBORAN: PENGANTAR KOMPREHENSIF UNTUK LABORAN DAN GURU SMK MIGAS CIBINONG, JAWA BARAT Samura, Lisa; Burhannudinnur, Muhammad; Prakoso, Suryo; Rosyidan, Cahaya; Maulani, Mustamina; Satiyawira, Bayu; Djumantara, Maman; Pearlo, Kevin Lukas; Soekardy, Mentari Gracia; Hidayat, Hifdzan Rizki
Jurnal Abdi Masyarakat Indonesia (JAMIN) Vol 6 No 1 (2024): JURNAL ABDI MASYARAKAT INDONESIA (JAMIN)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jamin.v6i1.16630

Abstract

The world of oil cannot be separated from drilling operations in extracting hydrocarbons from below the earth's surface. Drilling mud or drilling fluid is essential to the drilling process. Cibinong Oil and Gas Vocational School is a vocational school that has two study programs, namely, Oil and Gas Drilling Engineering and Oil and Gas Production Engineering. The laboratory assistants at the Oil and Gas Vocational School have limitations in explaining in detail about drilling fluids. Therefore, activity is necessary to increase insight and knowledge of drilling fluids, especially in supporting practical activities. The method used in this activity is the dissemination of knowledge about drilling mud accompanied by the practice of making a simple drilling mud mixture. Making drilling mud is carried out by comparing KCl polymer mud and polyamine as a shale inhibitor. This comparison is seen from the results of the physical properties of the mud produced, namely mud weight, funnel viscosity, plastic viscosity, yield point, 10-second gel strength, 10-minute gel strength, filtration rate, mud cake, and pH (acidity level). With this introductory activity, knowledge about drilling fluids for laboratory assistants and chemistry teachers as participants in PkM activities has increased. This increase in knowledge can benefit students who will continue their education at the undergraduate level in earth sciences at universities.
PERBANDINGAN SIFAT FISIK DAN THEOLOGI LUMPUR PENGEBORAN MENGGUNAKAN SISTEM BENTONITE PREHIDRAT PADA BERBAGAI TEMPERATUR Maulani, Mustamina; Nugrahanti, Asri; Satyawira, Bayu; Ginting, Mulia; Dwi Nuryana, Suherman; Samura, Lisa; Rosyidan, Cahaya; Jasmine, Gabriella; Lukas Pearlo, Kevin
Jurnal Abdi Masyarakat Indonesia (JAMIN) Vol 5 No 2 (2023): JURNAL ABDI MASYARAKAT INDONESIA (JAMIN)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jamin.v5i2.16747

Abstract

Lumpur pengeboran merupakan komponen penting dalam pengeboran. Dalam pengaplikasiannya lumpur yang digunakan adalah freshwater dan sea water. Untuk pengeboran lepas pantai cenderung menggunakan sea water mud yang berbahan dasar Attapulgite. Namun karena mahal dan sulit didapatkan maka digunakan Bentonite yang diprehidrasi terlebih dahulu untuk meningkatkan daya pengentalannya. Pengujian sifat fisik dan rheologi lumpur antara freshwater dan sea water dilakukan dengan beberapa tahapan dan berbagai temperatur, hasil analisis menunjukkan prehidrasi bentonite lebih efektif digunakan pada freshwater yang terlihat melalui sifat fisiknya yang lebih baik dibandingkan sea water. Pengetahuan akan sifat fisik dan rheologi lumpur pengeboran ini sangat penting diketahui sebagai pengetahuan dasar sebelum menginjak ke dunia kerja. Oleh karena itu SMK Migas Cibinong sebagai salah satu sekolah pencetak calon Petroleum Engineer, pelatihan menjadi sebuah tambahan pengetahuan sebagai bekal guru kimia dan laboran dalam pengembangan materi dasar pengeboran. Sehingga dari kegiatan ini terjadi transfer ilmu dari tim PkM (Pengabdian kepada Masyarakat) kepada guru kimia dan laboran di SMK Migas Cibinong tentang penerapan ilmu pengeboran khususnya lumpur menggunakan sistem prehidrasi bentonite. Sehingga saat memasuki jenjang sarjana strata satu di program studi terkait ilmu kebumian, mereka sudah memiliki bekal yang dapat dikembangkan
Pelatihan Statistik untuk Penilaian Berbagai Aset Properti Termasuk Migas bagi Karyawan KJPP di DKI Jakarta Prima, Andry; Rosyidan, Cahaya; Satiyawira, Bayu; Samsol, Samsol; Koesmawardani, Wildan Tri; Renanda, Raka Ilham
Jurnal Abdi Masyarakat Indonesia Vol 4 No 4 (2024): JAMSI - Juli 2024
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54082/jamsi.1246

Abstract

Pelatihan statistik bagi karyawan KJPP di Jakarta Selatan bertujuan untuk meningkatkan pemahaman dan keterampilan dalam penggunaan statistik, khususnya dalam penilaian properti migas. Pelatihan ini diikuti oleh 30 personel yang diukur keterampilan statistiknya melalui kuesioner sebelum dan sesudah pelatihan. Metode pelatihan berupa kuliah dan pendampingan dengan materi pelatihan mencakup teori dasar hingga aplikasi lanjutan statistik yang disajikan melalui presentasi dan studi kasus. Setelah dilakukan pendampingan, hasil analisis data menunjukkan peningkatan signifikan dalam pemahaman dan keterampilan statistik peserta setelah pelatihan. Peserta yang awalnya tidak memahami konsep statistik dasar kini mampu menerapkannya dalam pekerjaan sehari-hari, terutama dalam penilaian properti migas. Pembahasan juga mengidentifikasi berbagai aspek pelatihan yang dianggap paling bermanfaat oleh peserta, seperti pendekatan praktis dan studi kasus relevan. Saran untuk perbaikan di masa mendatang mencakup perpanjangan durasi pelatihan dan pengulangan berkala untuk mempertahankan keterampilan yang telah diperoleh. Kesimpulan menunjukkan bahwa pelatihan ini sangat efektif dan lebih dari 90% peserta menyatakan bahwa pelatihan ini bermanfaat dalam meningkatkan kompetensi mereka. Pelatihan semacam ini direkomendasikan untuk dilaksanakan secara berkala guna terus meningkatkan kompetensi personel KJPP dalam penilaian properti, terutama dalam sektor migas.
Co-Authors - Sunardi - Sunardi Abdul Hamid Alfiandi Sembiring Andreas Junianto Andreas Junianto Andrian Wijayono Andrian Wijayono Andry Prima Anggrainy, Rani Arinda Riswati Asri Nugrahanti Asri Nugrahanti, Asri Aulia Alfath Auliya, Hilyah Bambang Soegijono Basori Basori Bayu Satiyawira Bayu Satiyawira, Bayu Bayu Satyawira Bayu Satyawira, Bayu Budhy Kurniawan Dalimunthe, Yusraida Khairani Daniel Edbert, Daniel Dwi Nanto, Dwi Dwi Nuryana, Suherman DWI YULIANTI Ferry Budhi Susetyo Gabriella Jasmine Galih Vidia Putra, Valentinus Gemintang Atlantika Urbiyanto hanz seca rifansyah cipta maheza Harin Widiyatni Havid Pramadika Havidh Pramadika Hidayat, Hifdzan Rizki Hilyah Auliya Ir Bayu Satiyawira M.Si Irwan . Irwan . Irwan Irwan Jasmine, Gabriella Juliany Ningsih Mohamad Koesmawardani, Wildan Tri Kurniawan, Ova Livia Ailen Dharma Lubi, Ahmad Lukas Pearlo, Kevin Maman Djumantara Maman Djumantara Maman Djumantara, Maman Maman Kartaman Ajiriyanto Maulani, Mustamina Mixsindo Korra Herdyanti Muh Taufiq Fathaddin Muhammad Burhannudinnur Muhammad Burhannudinnur Muhammad Burhannudinnur Mulia Ginting, Mulia Mustamina Maulani Nababan, Frederik Gresia Nadhira Andini Onnie Ridaliani Prapansya Pantjanita Novi Hartami Pauhesti Pauhesti Pauhesti Pauhesti Pearlo, Kevin Lukas Pramadika, Havid Puri Wijanti Putra, Raka Handika Putra, Valentinus Galih Vidia Raihan Ramadhan Raisha Marsha Raka Handika Putra Ratnayu Sitaresmi Renanda, Raka Ilham Ririn Yulianti Riswati, Arinda Risyad Baihaqi Rizki Ananda Parulian Rosmalia Dita Nugraheni Samsol Samsol Samsol Samura, Lisa Shabrina Sri Riswati Sigit Rahmawan Situmorang, Evi Ulina Margaretha Soekardy, Mentari Gracia Suryo Prakoso, Suryo Syamsuir, Syamsuir Tina Martina Tina Martina, Tina Totong Irwan Urbiyanto, Gemintang Atlantika Valentinus Galih Vidia Putra Valentinus Galih Vidia Putra Wijayono, Andrian Yudanto, Sigit Dwi